friendica/include/diaspora.php

<?php

/**
 * @file include/diaspora.php
 * 
 * @todo GET /people/9aed8882b9f64896/stream
 */

require_once('include/crypto.php');
require_once('include/items.php');
require_once('include/bb2diaspora.php');
require_once('include/contact_selectors.php');
require_once('include/queue_fn.php');
require_once('include/lock.php');
require_once('include/threads.php');
require_once('mod/share.php');
require_once('include/enotify.php');

function diaspora_dispatch_public($msg) {

	$enabled = intval(get_config('system','diaspora_enabled'));
	if(! $enabled) {
		logger('mod-diaspora: disabled');
		return;
	}

	// Use a dummy importer to import the data for the public copy
	$importer = array("uid" => 0, "page-flags" => PAGE_FREELOVE);
	$result = diaspora_dispatch($importer,$msg);
	logger("Dispatcher reported ".$result, LOGGER_DEBUG);

	// Now distribute it to the followers
	$r = q("SELECT `user`.* FROM `user` WHERE `user`.`uid` IN
		( SELECT `contact`.`uid` FROM `contact` WHERE `contact`.`network` = '%s' AND `contact`.`addr` = '%s' )
		AND `account_expired` = 0 AND `account_removed` = 0 ",
		dbesc(NETWORK_DIASPORA),
		dbesc($msg['author'])
	);
	if(count($r)) {
		foreach($r as $rr) {
			logger('diaspora_public: delivering to: ' . $rr['username']);
			diaspora_dispatch($rr,$msg);
		}
	}
	else
		logger('diaspora_public: no subscribers for '.$msg["author"].' '.print_r($msg, true));
}



function diaspora_dispatch($importer,$msg,$attempt=1) {

	$ret = 0;

	$enabled = intval(get_config('system','diaspora_enabled'));
	if(! $enabled) {
		logger('mod-diaspora: disabled');
		return;
	}

	// php doesn't like dashes in variable names

	$msg['message'] = str_replace(
			array('<activity_streams-photo>','</activity_streams-photo>'),
			array('<asphoto>','</asphoto>'),
			$msg['message']);


	$parsed_xml = parse_xml_string($msg['message'],false);

	$xmlbase = $parsed_xml->post;

	logger('diaspora_dispatch: ' . print_r($xmlbase,true), LOGGER_DEBUG);


	if($xmlbase->request) {
		$ret = diaspora_request($importer,$xmlbase->request);
	}
	elseif($xmlbase->status_message) {
		$ret = diaspora_post($importer,$xmlbase->status_message,$msg);
	}
	elseif($xmlbase->profile) {
		$ret = diaspora_profile($importer,$xmlbase->profile,$msg);
	}
	elseif($xmlbase->comment) {
		$ret = diaspora_comment($importer,$xmlbase->comment,$msg);
	}
	elseif($xmlbase->like) {
		$ret = diaspora_like($importer,$xmlbase->like,$msg);
	}
	elseif($xmlbase->asphoto) {
		$ret = diaspora_asphoto($importer,$xmlbase->asphoto,$msg);
	}
	elseif($xmlbase->reshare) {
		$ret = diaspora_reshare($importer,$xmlbase->reshare,$msg);
	}
	elseif($xmlbase->retraction) {
		$ret = diaspora_retraction($importer,$xmlbase->retraction,$msg);
	}
	elseif($xmlbase->signed_retraction) {
		$ret = diaspora_signed_retraction($importer,$xmlbase->signed_retraction,$msg);
	}
	elseif($xmlbase->relayable_retraction) {
		$ret = diaspora_signed_retraction($importer,$xmlbase->relayable_retraction,$msg);
	}
	elseif($xmlbase->photo) {
		$ret = diaspora_photo($importer,$xmlbase->photo,$msg,$attempt);
	}
	elseif($xmlbase->conversation) {
		$ret = diaspora_conversation($importer,$xmlbase->conversation,$msg);
	}
	elseif($xmlbase->message) {
		$ret = diaspora_message($importer,$xmlbase->message,$msg);
	}
	elseif($xmlbase->participation) {
		$ret = diaspora_participation($importer,$xmlbase->participation);
	}
	else {
		logger('diaspora_dispatch: unknown message type: ' . print_r($xmlbase,true));
	}
	return $ret;
}

function diaspora_handle_from_contact($contact_id) {
	$handle = False;

	logger("diaspora_handle_from_contact: contact id is " . $contact_id, LOGGER_DEBUG);

	$r = q("SELECT network, addr, self, url, nick FROM contact WHERE id = %d",
	       intval($contact_id)
	);
	if($r) {
		$contact = $r[0];

		logger("diaspora_handle_from_contact: contact 'self' = " . $contact['self'] . " 'url' = " . $contact['url'], LOGGER_DEBUG);

		if($contact['network'] === NETWORK_DIASPORA) {
			$handle = $contact['addr'];

//			logger("diaspora_handle_from_contact: contact id is a Diaspora person, handle = " . $handle, LOGGER_DEBUG);
		}
		elseif(($contact['network'] === NETWORK_DFRN) || ($contact['self'] == 1)) {
			$baseurl_start = strpos($contact['url'],'://') + 3;
			$baseurl_length = strpos($contact['url'],'/profile') - $baseurl_start; // allows installations in a subdirectory--not sure how Diaspora will handle
			$baseurl = substr($contact['url'], $baseurl_start, $baseurl_length);
			$handle = $contact['nick'] . '@' . $baseurl;

//			logger("diaspora_handle_from_contact: contact id is a DFRN person, handle = " . $handle, LOGGER_DEBUG);
		}
	}

	return $handle;
}

function diaspora_get_contact_by_handle($uid,$handle) {
	$r = q("SELECT * FROM `contact` WHERE `network` = '%s' AND `uid` = %d AND `addr` = '%s' LIMIT 1",
		dbesc(NETWORK_DIASPORA),
		intval($uid),
		dbesc($handle)
	);
	if($r && count($r))
		return $r[0];

	$handle_parts = explode("@", $handle);
	$nurl_sql = '%%://' . $handle_parts[1] . '%%/profile/' . $handle_parts[0];
	$r = q("SELECT * FROM contact WHERE network = '%s' AND uid = %d AND nurl LIKE '%s' LIMIT 1",
	       dbesc(NETWORK_DFRN),
	       intval($uid),
	       dbesc($nurl_sql)
	);
	if($r && count($r))
		return $r[0];

	return false;
}

function find_diaspora_person_by_handle($handle) {

	$person = false;
	$update = false;
	$got_lock = false;

	$endlessloop = 0;
	$maxloops = 10;

	do {
		$r = q("select * from fcontact where network = '%s' and addr = '%s' limit 1",
			dbesc(NETWORK_DIASPORA),
			dbesc($handle)
		);
		if(count($r)) {
			$person = $r[0];
			logger('find_diaspora_person_by handle: in cache ' . print_r($r,true), LOGGER_DEBUG);

			// update record occasionally so it doesn't get stale
			$d = strtotime($person['updated'] . ' +00:00');
			if($d < strtotime('now - 14 days'))
				$update = true;
		}


		// FETCHING PERSON INFORMATION FROM REMOTE SERVER
		//
		// If the person isn't in our 'fcontact' table, or if he/she is but
		// his/her information hasn't been updated for more than 14 days, then
		// we want to fetch the person's information from the remote server.
		//
		// Note that $person isn't changed by this block of code unless the
		// person's information has been successfully fetched from the remote
		// server. So if $person was 'false' to begin with (because he/she wasn't
		// in the local cache), it'll stay false, and if $person held the local
		// cache information to begin with, it'll keep that information. That way
		// if there's a problem with the remote fetch, we can at least use our
		// cached information--it's better than nothing.

		if((! $person) || ($update))  {
			// Lock the function to prevent race conditions if multiple items
			// come in at the same time from a person who doesn't exist in
			// fcontact
			//
			// Don't loop forever. On the last loop, try to create the contact
			// whether the function is locked or not. Maybe the locking thread
			// has died or something. At any rate, a duplicate in 'fcontact'
			// is a much smaller problem than a deadlocked thread
			$got_lock = lock_function('find_diaspora_person_by_handle', false);
			if(($endlessloop + 1) >= $maxloops)
				$got_lock = true;

			if($got_lock) {
				logger('find_diaspora_person_by_handle: create or refresh', LOGGER_DEBUG);
				require_once('include/Scrape.php');
				$r = probe_url($handle, PROBE_DIASPORA);

				// Note that Friendica contacts can return a "Diaspora person"
				// if Diaspora connectivity is enabled on their server
				if((count($r)) && ($r['network'] === NETWORK_DIASPORA)) {
					add_fcontact($r,$update);
					$person = ($r);
				}

				unlock_function('find_diaspora_person_by_handle');
			}
			else {
				logger('find_diaspora_person_by_handle: couldn\'t lock function', LOGGER_DEBUG);
				if(! $person)
					block_on_function_lock('find_diaspora_person_by_handle');
			}
		}
	} while((! $person) && (! $got_lock) && (++$endlessloop < $maxloops));
	// We need to try again if the person wasn't in 'fcontact' but the function was locked.
	// The fact that the function was locked may mean that another process was creating the
	// person's record. It could also mean another process was creating or updating an unrelated
	// person.
	//
	// At any rate, we need to keep trying until we've either got the person or had a chance to
	// try to fetch his/her remote information. But we don't want to block on locking the
	// function, because if the other process is creating the record, then when we acquire the lock
	// we'll dive right into creating another, duplicate record. We DO want to at least wait
	// until the lock is released, so we don't flood the database with requests.
	//
	// If the person was in the 'fcontact' table, don't try again. It's not worth the time, since
	// we do have some information for the person

	return $person;
}


function get_diaspora_key($uri) {
	logger('Fetching diaspora key for: ' . $uri);

	$r = find_diaspora_person_by_handle($uri);
	if($r)
		return $r['pubkey'];
	return '';
}


function diaspora_pubmsg_build($msg,$user,$contact,$prvkey,$pubkey) {
	$a = get_app();

	logger('diaspora_pubmsg_build: ' . $msg, LOGGER_DATA);


	$handle = $user['nickname'] . '@' . substr($a->get_baseurl(), strpos($a->get_baseurl(),'://') + 3);

//	$b64_data = base64_encode($msg);
//	$b64url_data = base64url_encode($b64_data);

	$b64url_data = base64url_encode($msg);

	$data = str_replace(array("\n","\r"," ","\t"),array('','','',''),$b64url_data);

	$type = 'application/xml';
	$encoding = 'base64url';
	$alg = 'RSA-SHA256';

	$signable_data = $data  . '.' . base64url_encode($type) . '.'
		. base64url_encode($encoding) . '.' . base64url_encode($alg) ;

	$signature = rsa_sign($signable_data,$prvkey);
	$sig = base64url_encode($signature);

$magic_env = <<< EOT
<?xml version='1.0' encoding='UTF-8'?>
<diaspora xmlns="https://joindiaspora.com/protocol" xmlns:me="http://salmon-protocol.org/ns/magic-env" >
  <header>
    <author_id>$handle</author_id>
  </header>
  <me:env>
    <me:encoding>base64url</me:encoding>
    <me:alg>RSA-SHA256</me:alg>
    <me:data type="application/xml">$data</me:data>
    <me:sig>$sig</me:sig>
  </me:env>
</diaspora>
EOT;

	logger('diaspora_pubmsg_build: magic_env: ' . $magic_env, LOGGER_DATA);
	return $magic_env;

}




function diaspora_msg_build($msg,$user,$contact,$prvkey,$pubkey,$public = false) {
	$a = get_app();

	if($public)
		return diaspora_pubmsg_build($msg,$user,$contact,$prvkey,$pubkey);

	logger('diaspora_msg_build: ' . $msg, LOGGER_DATA);

	// without a public key nothing will work

	if(! $pubkey) {
		logger('diaspora_msg_build: pubkey missing: contact id: ' . $contact['id']);
		return '';
	}

	$inner_aes_key = random_string(32);
	$b_inner_aes_key = base64_encode($inner_aes_key);
	$inner_iv = random_string(16);
	$b_inner_iv = base64_encode($inner_iv);

	$outer_aes_key = random_string(32);
	$b_outer_aes_key = base64_encode($outer_aes_key);
	$outer_iv = random_string(16);
	$b_outer_iv = base64_encode($outer_iv);

	$handle = $user['nickname'] . '@' . substr($a->get_baseurl(), strpos($a->get_baseurl(),'://') + 3);

	$padded_data = pkcs5_pad($msg,16);
	$inner_encrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $inner_aes_key, $padded_data, MCRYPT_MODE_CBC, $inner_iv);

	$b64_data = base64_encode($inner_encrypted);


	$b64url_data = base64url_encode($b64_data);
	$data = str_replace(array("\n","\r"," ","\t"),array('','','',''),$b64url_data);

	$type = 'application/xml';
	$encoding = 'base64url';
	$alg = 'RSA-SHA256';

	$signable_data = $data  . '.' . base64url_encode($type) . '.'
		. base64url_encode($encoding) . '.' . base64url_encode($alg) ;

	$signature = rsa_sign($signable_data,$prvkey);
	$sig = base64url_encode($signature);

$decrypted_header = <<< EOT
<decrypted_header>
  <iv>$b_inner_iv</iv>
  <aes_key>$b_inner_aes_key</aes_key>
  <author_id>$handle</author_id>
</decrypted_header>
EOT;

	$decrypted_header = pkcs5_pad($decrypted_header,16);

	$ciphertext = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $outer_aes_key, $decrypted_header, MCRYPT_MODE_CBC, $outer_iv);

	$outer_json = json_encode(array('iv' => $b_outer_iv,'key' => $b_outer_aes_key));

	$encrypted_outer_key_bundle = '';
	openssl_public_encrypt($outer_json,$encrypted_outer_key_bundle,$pubkey);

	$b64_encrypted_outer_key_bundle = base64_encode($encrypted_outer_key_bundle);

	logger('outer_bundle: ' . $b64_encrypted_outer_key_bundle . ' key: ' . $pubkey, LOGGER_DATA);

	$encrypted_header_json_object = json_encode(array('aes_key' => base64_encode($encrypted_outer_key_bundle), 
		'ciphertext' => base64_encode($ciphertext)));
	$cipher_json = base64_encode($encrypted_header_json_object);

	$encrypted_header = '<encrypted_header>' . $cipher_json . '</encrypted_header>';

$magic_env = <<< EOT
<?xml version='1.0' encoding='UTF-8'?>
<diaspora xmlns="https://joindiaspora.com/protocol" xmlns:me="http://salmon-protocol.org/ns/magic-env" >
  $encrypted_header
  <me:env>
    <me:encoding>base64url</me:encoding>
    <me:alg>RSA-SHA256</me:alg>
    <me:data type="application/xml">$data</me:data>
    <me:sig>$sig</me:sig>
  </me:env>
</diaspora>
EOT;

	logger('diaspora_msg_build: magic_env: ' . $magic_env, LOGGER_DATA);
	return $magic_env;

}

/**
 *
 * diaspora_decode($importer,$xml)
 *   array $importer -> from user table
 *   string $xml -> urldecoded Diaspora salmon 
 *
 * Returns array
 * 'message' -> decoded Diaspora XML message
 * 'author' -> author diaspora handle
 * 'key' -> author public key (converted to pkcs#8)
 *
 * Author and key are used elsewhere to save a lookup for verifying replies and likes
 */


function diaspora_decode($importer,$xml) {

	$public = false;
	$basedom = parse_xml_string($xml);

	$children = $basedom->children('https://joindiaspora.com/protocol');

	if($children->header) {
		$public = true;
		$author_link = str_replace('acct:','',$children->header->author_id);
	}
	else {

		$encrypted_header = json_decode(base64_decode($children->encrypted_header));

		$encrypted_aes_key_bundle = base64_decode($encrypted_header->aes_key);
		$ciphertext = base64_decode($encrypted_header->ciphertext);

		$outer_key_bundle = '';
		openssl_private_decrypt($encrypted_aes_key_bundle,$outer_key_bundle,$importer['prvkey']);

		$j_outer_key_bundle = json_decode($outer_key_bundle);

		$outer_iv = base64_decode($j_outer_key_bundle->iv);
		$outer_key = base64_decode($j_outer_key_bundle->key);

		$decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $outer_key, $ciphertext, MCRYPT_MODE_CBC, $outer_iv);


		$decrypted = pkcs5_unpad($decrypted);

		/**
		 * $decrypted now contains something like
		 *
		 *  <decrypted_header>
		 *     <iv>8e+G2+ET8l5BPuW0sVTnQw==</iv>
		 *     <aes_key>UvSMb4puPeB14STkcDWq+4QE302Edu15oaprAQSkLKU=</aes_key>

***** OBSOLETE

		 *     <author>
		 *       <name>Ryan Hughes</name>
		 *       <uri>acct:galaxor@diaspora.pirateship.org</uri>
		 *     </author>

***** CURRENT

		 *     <author_id>galaxor@diaspora.priateship.org</author_id>

***** END DIFFS

		 *  </decrypted_header>
		 */

		logger('decrypted: ' . $decrypted, LOGGER_DEBUG);
		$idom = parse_xml_string($decrypted,false);

		$inner_iv = base64_decode($idom->iv);
		$inner_aes_key = base64_decode($idom->aes_key);

		$author_link = str_replace('acct:','',$idom->author_id);

	}

	$dom = $basedom->children(NAMESPACE_SALMON_ME);

	// figure out where in the DOM tree our data is hiding

	if($dom->provenance->data)
		$base = $dom->provenance;
	elseif($dom->env->data)
		$base = $dom->env;
	elseif($dom->data)
		$base = $dom;

	if(! $base) {
		logger('mod-diaspora: unable to locate salmon data in xml ');
		http_status_exit(400);
	}


	// Stash the signature away for now. We have to find their key or it won't be good for anything.
	$signature = base64url_decode($base->sig);

	// unpack the  data

	// strip whitespace so our data element will return to one big base64 blob
	$data = str_replace(array(" ","\t","\r","\n"),array("","","",""),$base->data);


	// stash away some other stuff for later

	$type = $base->data[0]->attributes()->type[0];
	$keyhash = $base->sig[0]->attributes()->keyhash[0];
	$encoding = $base->encoding;
	$alg = $base->alg;


	$signed_data = $data  . '.' . base64url_encode($type) . '.' . base64url_encode($encoding) . '.' . base64url_encode($alg);


	// decode the data
	$data = base64url_decode($data);


	if($public) {
		$inner_decrypted = $data;
	}
	else {

		// Decode the encrypted blob

		$inner_encrypted = base64_decode($data);
		$inner_decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $inner_aes_key, $inner_encrypted, MCRYPT_MODE_CBC, $inner_iv);
		$inner_decrypted = pkcs5_unpad($inner_decrypted);
	}

	if(! $author_link) {
		logger('mod-diaspora: Could not retrieve author URI.');
		http_status_exit(400);
	}

	// Once we have the author URI, go to the web and try to find their public key
	// (first this will look it up locally if it is in the fcontact cache)
	// This will also convert diaspora public key from pkcs#1 to pkcs#8

	logger('mod-diaspora: Fetching key for ' . $author_link );
	$key = get_diaspora_key($author_link);

	if(! $key) {
		logger('mod-diaspora: Could not retrieve author key.');
		http_status_exit(400);
	}

	$verify = rsa_verify($signed_data,$signature,$key);

	if(! $verify) {
		logger('mod-diaspora: Message did not verify. Discarding.');
		http_status_exit(400);
	}

	logger('mod-diaspora: Message verified.');

	return array('message' => $inner_decrypted, 'author' => $author_link, 'key' => $key);

}


function diaspora_request($importer,$xml) {

	$a = get_app();

	$sender_handle = unxmlify($xml->sender_handle);
	$recipient_handle = unxmlify($xml->recipient_handle);

	if(! $sender_handle || ! $recipient_handle)
		return;

	$contact = diaspora_get_contact_by_handle($importer['uid'],$sender_handle);

	if($contact) {

		// perhaps we were already sharing with this person. Now they're sharing with us.
		// That makes us friends.

		if($contact['rel'] == CONTACT_IS_FOLLOWER && in_array($importer['page-flags'], array(PAGE_FREELOVE))) {
			q("UPDATE `contact` SET `rel` = %d, `writable` = 1 WHERE `id` = %d AND `uid` = %d",
				intval(CONTACT_IS_FRIEND),
				intval($contact['id']),
				intval($importer['uid'])
			);
		}
		// send notification

		$r = q("SELECT `hide-friends` FROM `profile` WHERE `uid` = %d AND `is-default` = 1 LIMIT 1",
			intval($importer['uid'])
		);

		if((count($r)) && (!$r[0]['hide-friends']) && (!$contact['hidden']) && intval(get_pconfig($importer['uid'],'system','post_newfriend'))) {
			require_once('include/items.php');

			$self = q("SELECT * FROM `contact` WHERE `self` = 1 AND `uid` = %d LIMIT 1",
				intval($importer['uid'])
			);

			// they are not CONTACT_IS_FOLLOWER anymore but that's what we have in the array

			if(count($self) && $contact['rel'] == CONTACT_IS_FOLLOWER) {

				$arr = array();
				$arr['uri'] = $arr['parent-uri'] = item_new_uri($a->get_hostname(), $importer['uid']);
				$arr['uid'] = $importer['uid'];
				$arr['contact-id'] = $self[0]['id'];
				$arr['wall'] = 1;
				$arr['type'] = 'wall';
				$arr['gravity'] = 0;
				$arr['origin'] = 1;
				$arr['author-name'] = $arr['owner-name'] = $self[0]['name'];
				$arr['author-link'] = $arr['owner-link'] = $self[0]['url'];
				$arr['author-avatar'] = $arr['owner-avatar'] = $self[0]['thumb'];
				$arr['verb'] = ACTIVITY_FRIEND;
				$arr['object-type'] = ACTIVITY_OBJ_PERSON;

				$A = '[url=' . $self[0]['url'] . ']' . $self[0]['name'] . '[/url]';
				$B = '[url=' . $contact['url'] . ']' . $contact['name'] . '[/url]';
				$BPhoto = '[url=' . $contact['url'] . ']' . '[img]' . $contact['thumb'] . '[/img][/url]';
				$arr['body'] =  sprintf( t('%1$s is now friends with %2$s'), $A, $B)."\n\n\n".$Bphoto;

				$arr['object'] = '<object><type>' . ACTIVITY_OBJ_PERSON . '</type><title>' . $contact['name'] . '</title>'
					. '<id>' . $contact['url'] . '/' . $contact['name'] . '</id>';
				$arr['object'] .= '<link>' . xmlify('<link rel="alternate" type="text/html" href="' . $contact['url'] . '" />' . "\n");
				$arr['object'] .= xmlify('<link rel="photo" type="image/jpeg" href="' . $contact['thumb'] . '" />' . "\n");
				$arr['object'] .= '</link></object>' . "\n";
				$arr['last-child'] = 1;

				$arr['allow_cid'] = $user[0]['allow_cid'];
				$arr['allow_gid'] = $user[0]['allow_gid'];
				$arr['deny_cid']  = $user[0]['deny_cid'];
				$arr['deny_gid']  = $user[0]['deny_gid'];

				$i = item_store($arr);
				if($i)
				proc_run('php',"include/notifier.php","activity","$i");

			}

		}

		return;
	}

	$ret = find_diaspora_person_by_handle($sender_handle);


	if((! count($ret)) || ($ret['network'] != NETWORK_DIASPORA)) {
		logger('diaspora_request: Cannot resolve diaspora handle ' . $sender_handle . ' for ' . $recipient_handle);
		return;
	}

	$batch = (($ret['batch']) ? $ret['batch'] : implode('/', array_slice(explode('/',$ret['url']),0,3)) . '/receive/public');



	$r = q("INSERT INTO `contact` (`uid`, `network`,`addr`,`created`,`url`,`nurl`,`batch`,`name`,`nick`,`photo`,`pubkey`,`notify`,`poll`,`blocked`,`priority`)
		VALUES ( %d, '%s', '%s', '%s', '%s','%s','%s','%s','%s','%s','%s','%s','%s',%d,%d) ",
		intval($importer['uid']),
		dbesc($ret['network']),
		dbesc($ret['addr']),
		datetime_convert(),
		dbesc($ret['url']),
		dbesc(normalise_link($ret['url'])),
		dbesc($batch),
		dbesc($ret['name']),
		dbesc($ret['nick']),
		dbesc($ret['photo']),
		dbesc($ret['pubkey']),
		dbesc($ret['notify']),
		dbesc($ret['poll']),
		1,
		2
	);

	// find the contact record we just created

	$contact_record = diaspora_get_contact_by_handle($importer['uid'],$sender_handle);

	if(! $contact_record) {
		logger('diaspora_request: unable to locate newly created contact record.');
		return;
	}

	$g = q("select def_gid from user where uid = %d limit 1",
		intval($importer['uid'])
	);
	if($g && intval($g[0]['def_gid'])) {
		require_once('include/group.php');
		group_add_member($importer['uid'],'',$contact_record['id'],$g[0]['def_gid']);
	}

	if($importer['page-flags'] == PAGE_NORMAL) {

		$hash = random_string() . (string) time();   // Generate a confirm_key

		$ret = q("INSERT INTO `intro` ( `uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime` )
			VALUES ( %d, %d, %d, %d, '%s', '%s', '%s' )",
			intval($importer['uid']),
			intval($contact_record['id']),
			0,
			0,
			dbesc( t('Sharing notification from Diaspora network')),
			dbesc($hash),
			dbesc(datetime_convert())
		);
	}
	else {

		// automatic friend approval

		require_once('include/Photo.php');

		$photos = import_profile_photo($contact_record['photo'],$importer['uid'],$contact_record['id']);

		// technically they are sharing with us (CONTACT_IS_SHARING),
		// but if our page-type is PAGE_COMMUNITY or PAGE_SOAPBOX
		// we are going to change the relationship and make them a follower.

		if($importer['page-flags'] == PAGE_FREELOVE)
			$new_relation = CONTACT_IS_FRIEND;
		else
			$new_relation = CONTACT_IS_FOLLOWER;

		$r = q("UPDATE `contact` SET
			`photo` = '%s',
			`thumb` = '%s',
			`micro` = '%s',
			`rel` = %d,
			`name-date` = '%s',
			`uri-date` = '%s',
			`avatar-date` = '%s',
			`blocked` = 0,
			`pending` = 0,
			`writable` = 1
			WHERE `id` = %d
			",
			dbesc($photos[0]),
			dbesc($photos[1]),
			dbesc($photos[2]),
			intval($new_relation),
			dbesc(datetime_convert()),
			dbesc(datetime_convert()),
			dbesc(datetime_convert()),
			intval($contact_record['id'])
		);

		$u = q("select * from user where uid = %d limit 1",intval($importer['uid']));
		if($u)
			$ret = diaspora_share($u[0],$contact_record);
	}

	return;
}

function diaspora_post_allow($importer,$contact, $is_comment = false) {

	// perhaps we were already sharing with this person. Now they're sharing with us.
	// That makes us friends.
	// Normally this should have handled by getting a request - but this could get lost
	if($contact['rel'] == CONTACT_IS_FOLLOWER && in_array($importer['page-flags'], array(PAGE_FREELOVE))) {
		q("UPDATE `contact` SET `rel` = %d, `writable` = 1 WHERE `id` = %d AND `uid` = %d",
			intval(CONTACT_IS_FRIEND),
			intval($contact['id']),
			intval($importer['uid'])
		);
		$contact['rel'] = CONTACT_IS_FRIEND;
		logger('diaspora_post_allow: defining user '.$contact["nick"].' as friend');
	}

	if(($contact['blocked']) || ($contact['readonly']) || ($contact['archive']))
		return false;
	if($contact['rel'] == CONTACT_IS_SHARING || $contact['rel'] == CONTACT_IS_FRIEND)
		return true;
	if($contact['rel'] == CONTACT_IS_FOLLOWER)
		if(($importer['page-flags'] == PAGE_COMMUNITY) OR $is_comment)
			return true;

	// Messages for the global users are always accepted
	if ($importer['uid'] == 0)
		return true;

	return false;
}

function diaspora_is_redmatrix($url) {
	return(strstr($url, "/channel/"));
}

function diaspora_plink($addr, $guid) {
	$r = q("SELECT `url`, `nick`, `network` FROM `fcontact` WHERE `addr`='%s' LIMIT 1", dbesc($addr));

	// Fallback
	if (!$r)
		return 'https://'.substr($addr,strpos($addr,'@')+1).'/posts/'.$guid;

	// Friendica contacts are often detected as Diaspora contacts in the "fcontact" table
	// So we try another way as well.
	$s = q("SELECT `network` FROM `gcontact` WHERE `nurl`='%s' LIMIT 1", dbesc(normalise_link($r[0]["url"])));
	if ($s)
		$r[0]["network"] = $s[0]["network"];

	if ($r[0]["network"] == NETWORK_DFRN)
		return(str_replace("/profile/".$r[0]["nick"]."/", "/display/".$guid, $r[0]["url"]."/"));

	if (diaspora_is_redmatrix($r[0]["url"]))
		return $r[0]["url"]."/?f=&mid=".$guid;

	return 'https://'.substr($addr,strpos($addr,'@')+1).'/posts/'.$guid;
}

function diaspora_repair_signature($signature, $handle = "", $level = 1) {

	if ($signature == "")
		return($signature);

	if (base64_encode(base64_decode(base64_decode($signature))) == base64_decode($signature)) {
		$signature = base64_decode($signature);
		logger("Repaired double encoded signature from Diaspora/Hubzilla handle ".$handle." - level ".$level, LOGGER_DEBUG);

		// Do a recursive call to be able to fix even multiple levels
		if ($level < 10)
			$signature = diaspora_repair_signature($signature, $handle, ++$level);
	}

	return($signature);
}

function diaspora_post($importer,$xml,$msg) {

	$a = get_app();
	$guid = notags(unxmlify($xml->guid));
	$diaspora_handle = notags(unxmlify($xml->diaspora_handle));

	if($diaspora_handle != $msg['author']) {
		logger('diaspora_post: Potential forgery. Message handle is not the same as envelope sender.');
		return 202;
	}

	$contact = diaspora_get_contact_by_handle($importer['uid'],$diaspora_handle);
	if(! $contact) {
		logger('diaspora_post: A Contact for handle '.$diaspora_handle.' and user '.$importer['uid'].' was not found');
		return 203;
	}

	if(! diaspora_post_allow($importer,$contact, false)) {
		logger('diaspora_post: Ignoring this author.');
		return 202;
	}

	$message_id = $diaspora_handle . ':' . $guid;
	$r = q("SELECT `id` FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
		intval($importer['uid']),
		dbesc($guid)
	);
	if(count($r)) {
		logger('diaspora_post: message exists: ' . $guid);
		return 208;
	}

	$created = unxmlify($xml->created_at);
	$private = ((unxmlify($xml->public) == 'false') ? 1 : 0);

	$body = diaspora2bb($xml->raw_message);

	$datarray = array();

	$datarray["object"] = json_encode($xml);

	if($xml->photo->remote_photo_path AND $xml->photo->remote_photo_name)
		$datarray["object-type"] = ACTIVITY_OBJ_PHOTO;
	else {
		$datarray['object-type'] = ACTIVITY_OBJ_NOTE;
		// Add OEmbed and other information to the body
		if (!diaspora_is_redmatrix($contact['url']))
			$body = add_page_info_to_body($body, false, true);
	}

	$str_tags = '';

	$cnt = preg_match_all('/@\[url=(.*?)\[\/url\]/ism',$body,$matches,PREG_SET_ORDER);
	if($cnt) {
		foreach($matches as $mtch) {
			if(strlen($str_tags))
				$str_tags .= ',';
			$str_tags .= '@[url=' . $mtch[1] . '[/url]';
		}
	}

	$plink = diaspora_plink($diaspora_handle, $guid);

	$datarray['uid'] = $importer['uid'];
	$datarray['contact-id'] = $contact['id'];
	$datarray['wall'] = 0;
	$datarray['network'] = NETWORK_DIASPORA;
	$datarray['verb'] = ACTIVITY_POST;
	$datarray['guid'] = $guid;
	$datarray['uri'] = $datarray['parent-uri'] = $message_id;
	$datarray['changed'] = $datarray['created'] = $datarray['edited'] = datetime_convert('UTC','UTC',$created);
	$datarray['private'] = $private;
	$datarray['parent'] = 0;
	$datarray['plink'] = $plink;
	$datarray['owner-name'] = $contact['name'];
	$datarray['owner-link'] = $contact['url'];
	//$datarray['owner-avatar'] = $contact['thumb'];
	$datarray['owner-avatar'] = ((x($contact,'thumb')) ? $contact['thumb'] : $contact['photo']);
	$datarray['author-name'] = $contact['name'];
	$datarray['author-link'] = $contact['url'];
	$datarray['author-avatar'] = $contact['thumb'];
	$datarray['body'] = $body;
	$datarray['tag'] = $str_tags;
	if ($xml->provider_display_name)
		$datarray["app"] = unxmlify($xml->provider_display_name);
	else
		$datarray['app']  = 'Diaspora';

	// if empty content it might be a photo that hasn't arrived yet. If a photo arrives, we'll make it visible.

	$datarray['visible'] = ((strlen($body)) ? 1 : 0);

	DiasporaFetchGuid($datarray);
	$message_id = item_store($datarray);

	logger("Stored item with message id ".$message_id, LOGGER_DEBUG);

	return 201;

}

function DiasporaFetchGuid($item) {
	preg_replace_callback("&\[url=/posts/([^\[\]]*)\](.*)\[\/url\]&Usi",
		function ($match) use ($item){
			return(DiasporaFetchGuidSub($match, $item));
		},$item["body"]);
}

function DiasporaFetchGuidSub($match, $item) {
	$a = get_app();

	if (!diaspora_store_by_guid($match[1], $item["author-link"]))
		diaspora_store_by_guid($match[1], $item["owner-link"]);
}

function diaspora_store_by_guid($guid, $server, $uid = 0) {
	require_once("include/Contact.php");

	$serverparts = parse_url($server);
	$server = $serverparts["scheme"]."://".$serverparts["host"];

	logger("Trying to fetch item ".$guid." from ".$server, LOGGER_DEBUG);

	$item = diaspora_fetch_message($guid, $server);

	if (!$item)
		return false;

	logger("Successfully fetched item ".$guid." from ".$server, LOGGER_DEBUG);

	$body = $item["body"];
	$str_tags = $item["tag"];
	$app = $item["app"];
	$created = $item["created"];
	$author = $item["author"];
	$guid = $item["guid"];
	$private = $item["private"];
	$object = $item["object"];
	$objecttype = $item["object-type"];

	$message_id = $author.':'.$guid;
	$r = q("SELECT `id` FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
		intval($uid),
		dbesc($guid)
	);
	if(count($r))
		return $r[0]["id"];

	$person = find_diaspora_person_by_handle($author);

	$contact_id = get_contact($person['url'], $uid);

	$contacts = q("SELECT * FROM `contact` WHERE `id` = %d", intval($contact_id));
	$importers = q("SELECT * FROM `user` WHERE `uid` = %d", intval($uid));

	if ($contacts AND $importers)
		if(!diaspora_post_allow($importers[0],$contacts[0], false)) {
			logger('Ignoring author '.$person['url'].' for uid '.$uid);
			return false;
		} else
			logger('Author '.$person['url'].' is allowed for uid '.$uid);

	$datarray = array();
	$datarray['uid'] = $uid;
	$datarray['contact-id'] = $contact_id;
	$datarray['wall'] = 0;
	$datarray['network']  = NETWORK_DIASPORA;
	$datarray['guid'] = $guid;
	$datarray['uri'] = $datarray['parent-uri'] = $message_id;
	$datarray['changed'] = $datarray['created'] = $datarray['edited'] = datetime_convert('UTC','UTC',$created);
	$datarray['private'] = $private;
	$datarray['parent'] = 0;
	$datarray['plink'] = diaspora_plink($author, $guid);
	$datarray['author-name'] = $person['name'];
	$datarray['author-link'] = $person['url'];
	$datarray['author-avatar'] = ((x($person,'thumb')) ? $person['thumb'] : $person['photo']);
	$datarray['owner-name'] = $datarray['author-name'];
	$datarray['owner-link'] = $datarray['author-link'];
	$datarray['owner-avatar'] = $datarray['author-avatar'];
	$datarray['body'] = $body;
	$datarray['tag'] = $str_tags;
	$datarray['app']  = $app;
	$datarray['visible'] = ((strlen($body)) ? 1 : 0);
	$datarray['object'] = $object;
	$datarray['object-type'] = $objecttype;

	if ($datarray['contact-id'] == 0)
		return false;

	DiasporaFetchGuid($datarray);
	$message_id = item_store($datarray);

	/// @TODO
	/// Looking if there is some subscribe mechanism in Diaspora to get all comments for this post

	return $message_id;
}

function diaspora_fetch_message($guid, $server, $level = 0) {

	if ($level > 5)
		return false;

	$a = get_app();

	// This will not work if the server is not a Diaspora server
	$source_url = $server.'/p/'.$guid.'.xml';
	$x = fetch_url($source_url);
	if(!$x)
		return false;

	$x = str_replace(array('<activity_streams-photo>','</activity_streams-photo>'),array('<asphoto>','</asphoto>'),$x);
	$source_xml = parse_xml_string($x,false);

	$item = array();
	$item["app"] = 'Diaspora';
	$item["guid"] = $guid;
	$body = "";

	if ($source_xml->post->status_message->created_at)
		$item["created"] = unxmlify($source_xml->post->status_message->created_at);

	if ($source_xml->post->status_message->provider_display_name)
		$item["app"] = unxmlify($source_xml->post->status_message->provider_display_name);

	if ($source_xml->post->status_message->diaspora_handle)
		$item["author"] = unxmlify($source_xml->post->status_message->diaspora_handle);

	if ($source_xml->post->status_message->guid)
		$item["guid"] = unxmlify($source_xml->post->status_message->guid);

	$item["private"] = (unxmlify($source_xml->post->status_message->public) == 'false');
	$item["object"] = json_encode($source_xml->post);

	if(strlen($source_xml->post->asphoto->objectId) && ($source_xml->post->asphoto->objectId != 0) && ($source_xml->post->asphoto->image_url)) {
		$item["object-type"] = ACTIVITY_OBJ_PHOTO;
		$body = '[url=' . notags(unxmlify($source_xml->post->asphoto->image_url)) . '][img]' . notags(unxmlify($source_xml->post->asphoto->objectId)) . '[/img][/url]' . "\n";
		$body = scale_external_images($body,false);
	} elseif($source_xml->post->asphoto->image_url) {
		$item["object-type"] = ACTIVITY_OBJ_PHOTO;
		$body = '[img]' . notags(unxmlify($source_xml->post->asphoto->image_url)) . '[/img]' . "\n";
		$body = scale_external_images($body);
	} elseif($source_xml->post->status_message) {
		$body = diaspora2bb($source_xml->post->status_message->raw_message);

		// Checking for embedded pictures
		if($source_xml->post->status_message->photo->remote_photo_path AND
			$source_xml->post->status_message->photo->remote_photo_name) {

			$item["object-type"] = ACTIVITY_OBJ_PHOTO;

			$remote_photo_path = notags(unxmlify($source_xml->post->status_message->photo->remote_photo_path));
			$remote_photo_name = notags(unxmlify($source_xml->post->status_message->photo->remote_photo_name));

			$body = '[img]'.$remote_photo_path.$remote_photo_name.'[/img]'."\n".$body;

			logger('embedded picture link found: '.$body, LOGGER_DEBUG);
		} else
			$item["object-type"] = ACTIVITY_OBJ_NOTE;

		$body = scale_external_images($body);

		// Add OEmbed and other information to the body
		/// @TODO It could be a repeated redmatrix item
		/// Then we shouldn't add further data to it
		if ($item["object-type"] == ACTIVITY_OBJ_NOTE)
			$body = add_page_info_to_body($body, false, true);

	} elseif($source_xml->post->reshare) {
		// Reshare of a reshare
		return diaspora_fetch_message($source_xml->post->reshare->root_guid, $server, ++$level);
	} else {
		// Maybe it is a reshare of a photo that will be delivered at a later time (testing)
		logger('no content found: '.print_r($source_xml,true));
		return false;
	}

	if (trim($body) == "")
		return false;

	$item["tag"] = '';
	$item["body"] = $body;

	return $item;
}

function diaspora_reshare($importer,$xml,$msg) {

	logger('diaspora_reshare: init: ' . print_r($xml,true));

	$a = get_app();
	$guid = notags(unxmlify($xml->guid));
	$diaspora_handle = notags(unxmlify($xml->diaspora_handle));


	if($diaspora_handle != $msg['author']) {
		logger('diaspora_post: Potential forgery. Message handle is not the same as envelope sender.');
		return 202;
	}

	$contact = diaspora_get_contact_by_handle($importer['uid'],$diaspora_handle);
	if(! $contact)
		return;

	if(! diaspora_post_allow($importer,$contact, false)) {
		logger('diaspora_reshare: Ignoring this author: ' . $diaspora_handle . ' ' . print_r($xml,true));
		return 202;
	}

	$message_id = $diaspora_handle . ':' . $guid;
	$r = q("SELECT `id` FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
		intval($importer['uid']),
		dbesc($guid)
	);
	if(count($r)) {
		logger('diaspora_reshare: message exists: ' . $guid);
		return;
	}

	$orig_author = notags(unxmlify($xml->root_diaspora_id));
	$orig_guid = notags(unxmlify($xml->root_guid));
	$orig_url = $a->get_baseurl()."/display/".$orig_guid;

	$create_original_post = false;

	// Do we already have this item?
	$r = q("SELECT `body`, `tag`, `app`, `created`, `plink`, `object`, `object-type`, `uri` FROM `item` WHERE `guid` = '%s' AND `visible` AND NOT `deleted` AND `body` != '' LIMIT 1",
		dbesc($orig_guid),
		dbesc(NETWORK_DIASPORA)
	);
	if(count($r)) {
		logger('reshared message '.$orig_guid." reshared by ".$guid.' already exists on system.');

		// Maybe it is already a reshared item?
		// Then refetch the content, since there can be many side effects with reshared posts from other networks or reshares from reshares
		require_once('include/api.php');
		if (api_share_as_retweet($r[0]))
			$r = array();
		else {
			$body = $r[0]["body"];
			$str_tags = $r[0]["tag"];
			$app = $r[0]["app"];
			$orig_created = $r[0]["created"];
			$orig_plink = $r[0]["plink"];
			$orig_uri = $r[0]["uri"];
			$object = $r[0]["object"];
			$objecttype = $r[0]["object-type"];
		}
	}

	if (!count($r)) {
		$body = "";
		$str_tags = "";
		$app = "";

		$server = 'https://'.substr($orig_author,strpos($orig_author,'@')+1);
		logger('1st try: reshared message '.$orig_guid." reshared by ".$guid.' will be fetched from original server: '.$server);
		$item = diaspora_fetch_message($orig_guid, $server);

		if (!$item) {
			$server = 'https://'.substr($diaspora_handle,strpos($diaspora_handle,'@')+1);
			logger('2nd try: reshared message '.$orig_guid." reshared by ".$guid." will be fetched from sharer's server: ".$server);
			$item = diaspora_fetch_message($orig_guid, $server);
		}
		if (!$item) {
			$server = 'http://'.substr($orig_author,strpos($orig_author,'@')+1);
			logger('3rd try: reshared message '.$orig_guid." reshared by ".$guid.' will be fetched from original server: '.$server);
			$item = diaspora_fetch_message($orig_guid, $server);
		}
		if (!$item) {
			$server = 'http://'.substr($diaspora_handle,strpos($diaspora_handle,'@')+1);
			logger('4th try: reshared message '.$orig_guid." reshared by ".$guid." will be fetched from sharer's server: ".$server);
			$item = diaspora_fetch_message($orig_guid, $server);
		}

		if ($item) {
			$body = $item["body"];
			$str_tags = $item["tag"];
			$app = $item["app"];
			$orig_created = $item["created"];
			$orig_author = $item["author"];
			$orig_guid = $item["guid"];
			$orig_plink = diaspora_plink($orig_author, $orig_guid);
			$orig_uri = $orig_author.':'.$orig_guid;
			$create_original_post = ($body != "");
			$object = $item["object"];
			$objecttype = $item["object-type"];
		}
	}

	$plink = diaspora_plink($diaspora_handle, $guid);

	$person = find_diaspora_person_by_handle($orig_author);

	$created = unxmlify($xml->created_at);
	$private = ((unxmlify($xml->public) == 'false') ? 1 : 0);

	$datarray = array();

	$datarray['uid'] = $importer['uid'];
	$datarray['contact-id'] = $contact['id'];
	$datarray['wall'] = 0;
	$datarray['network']  = NETWORK_DIASPORA;
	$datarray['guid'] = $guid;
	$datarray['uri'] = $datarray['parent-uri'] = $message_id;
	$datarray['changed'] = $datarray['created'] = $datarray['edited'] = datetime_convert('UTC','UTC',$created);
	$datarray['private'] = $private;
	$datarray['parent'] = 0;
	$datarray['plink'] = $plink;
	$datarray['owner-name'] = $contact['name'];
	$datarray['owner-link'] = $contact['url'];
	$datarray['owner-avatar'] = ((x($contact,'thumb')) ? $contact['thumb'] : $contact['photo']);
	if (!intval(get_config('system','wall-to-wall_share'))) {
		$prefix = share_header($person['name'], $person['url'], ((x($person,'thumb')) ? $person['thumb'] : $person['photo']), $orig_guid, $orig_created, $orig_url);

		$datarray['author-name'] = $contact['name'];
		$datarray['author-link'] = $contact['url'];
		$datarray['author-avatar'] = $contact['thumb'];
		$datarray['body'] = $prefix.$body."[/share]";
	} else {
		// Let reshared messages look like wall-to-wall posts
		$datarray['author-name'] = $person['name'];
		$datarray['author-link'] = $person['url'];
		$datarray['author-avatar'] = ((x($person,'thumb')) ? $person['thumb'] : $person['photo']);
		$datarray['body'] = $body;
	}

	$datarray["object"] = json_encode($xml);
	$datarray['object-type'] = $objecttype;

	$datarray['tag'] = $str_tags;
	$datarray['app']  = $app;

	// if empty content it might be a photo that hasn't arrived yet. If a photo arrives, we'll make it visible. (testing)
	$datarray['visible'] = ((strlen($body)) ? 1 : 0);

	// Store the original item of a reshare
	if ($create_original_post) {
		require_once("include/Contact.php");

		$datarray2 = $datarray;

		$datarray2['uid'] = 0;
		$datarray2['contact-id'] = get_contact($person['url'], 0);
		$datarray2['guid'] = $orig_guid;
		$datarray2['uri'] = $datarray2['parent-uri'] = $orig_uri;
		$datarray2['changed'] = $datarray2['created'] = $datarray2['edited'] = $datarray2['commented'] = $datarray2['received'] = datetime_convert('UTC','UTC',$orig_created);
		$datarray2['parent'] = 0;
		$datarray2['plink'] = $orig_plink;

		$datarray2['author-name'] = $person['name'];
		$datarray2['author-link'] = $person['url'];
		$datarray2['author-avatar'] = ((x($person,'thumb')) ? $person['thumb'] : $person['photo']);
		$datarray2['owner-name'] = $datarray2['author-name'];
		$datarray2['owner-link'] = $datarray2['author-link'];
		$datarray2['owner-avatar'] = $datarray2['author-avatar'];
		$datarray2['body'] = $body;
		$datarray2["object"] = $object;

		DiasporaFetchGuid($datarray2);
		$message_id = item_store($datarray2);

		logger("Store original item ".$orig_guid." under message id ".$message_id);
	}

	DiasporaFetchGuid($datarray);
	$message_id = item_store($datarray);

	return;

}


function diaspora_asphoto($importer,$xml,$msg) {
	logger('diaspora_asphoto called');

	$a = get_app();
	$guid = notags(unxmlify($xml->guid));
	$diaspora_handle = notags(unxmlify($xml->diaspora_handle));

	if($diaspora_handle != $msg['author']) {
		logger('diaspora_post: Potential forgery. Message handle is not the same as envelope sender.');
		return 202;
	}

	$contact = diaspora_get_contact_by_handle($importer['uid'],$diaspora_handle);
	if(! $contact)
		return;

	if(! diaspora_post_allow($importer,$contact, false)) {
		logger('diaspora_asphoto: Ignoring this author.');
		return 202;
	}

	$message_id = $diaspora_handle . ':' . $guid;
	$r = q("SELECT `id` FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
		intval($importer['uid']),
		dbesc($guid)
	);
	if(count($r)) {
		logger('diaspora_asphoto: message exists: ' . $guid);
		return;
	}

	$created = unxmlify($xml->created_at);
	$private = ((unxmlify($xml->public) == 'false') ? 1 : 0);

	if(strlen($xml->objectId) && ($xml->objectId != 0) && ($xml->image_url)) {
		$body = '[url=' . notags(unxmlify($xml->image_url)) . '][img]' . notags(unxmlify($xml->objectId)) . '[/img][/url]' . "\n";
		$body = scale_external_images($body,false);
	}
	elseif($xml->image_url) {
		$body = '[img]' . notags(unxmlify($xml->image_url)) . '[/img]' . "\n";
		$body = scale_external_images($body);
	}
	else {
		logger('diaspora_asphoto: no photo url found.');
		return;
	}

	$plink = diaspora_plink($diaspora_handle, $guid);

	$datarray = array();

	$datarray['uid'] = $importer['uid'];
	$datarray['contact-id'] = $contact['id'];
	$datarray['wall'] = 0;
	$datarray['network']  = NETWORK_DIASPORA;
	$datarray['guid'] = $guid;
	$datarray['uri'] = $datarray['parent-uri'] = $message_id;
	$datarray['changed'] = $datarray['created'] = $datarray['edited'] = datetime_convert('UTC','UTC',$created);
	$datarray['private'] = $private;
	$datarray['parent'] = 0;
	$datarray['plink'] = $plink;
	$datarray['owner-name'] = $contact['name'];
	$datarray['owner-link'] = $contact['url'];
	//$datarray['owner-avatar'] = $contact['thumb'];
	$datarray['owner-avatar'] = ((x($contact,'thumb')) ? $contact['thumb'] : $contact['photo']);
	$datarray['author-name'] = $contact['name'];
	$datarray['author-link'] = $contact['url'];
	$datarray['author-avatar'] = $contact['thumb'];
	$datarray['body'] = $body;
	$datarray["object"] = json_encode($xml);
	$datarray['object-type'] = ACTIVITY_OBJ_PHOTO;

	$datarray['app']  = 'Diaspora/Cubbi.es';

	DiasporaFetchGuid($datarray);
	$message_id = item_store($datarray);

	//if($message_id) {
	//	q("update item set plink = '%s' where id = %d",
	//		dbesc($a->get_baseurl() . '/display/' . $importer['nickname'] . '/' . $message_id),
	//		intval($message_id)
	//	);
	//}

	return;

}

function diaspora_comment($importer,$xml,$msg) {

	$a = get_app();
	$guid = notags(unxmlify($xml->guid));
	$parent_guid = notags(unxmlify($xml->parent_guid));
	$diaspora_handle = notags(unxmlify($xml->diaspora_handle));
	$target_type = notags(unxmlify($xml->target_type));
	$text = unxmlify($xml->text);
	$author_signature = notags(unxmlify($xml->author_signature));

	$parent_author_signature = (($xml->parent_author_signature) ? notags(unxmlify($xml->parent_author_signature)) : '');

	$contact = diaspora_get_contact_by_handle($importer['uid'],$msg['author']);
	if(! $contact) {
		logger('diaspora_comment: cannot find contact: ' . $msg['author']);
		return;
	}

	if(! diaspora_post_allow($importer,$contact, true)) {
		logger('diaspora_comment: Ignoring this author.');
		return 202;
	}

	$r = q("SELECT * FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
		intval($importer['uid']),
		dbesc($guid)
	);
	if(count($r)) {
		logger('diaspora_comment: our comment just got relayed back to us (or there was a guid collision) : ' . $guid);
		return;
	}

	$r = q("SELECT * FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
		intval($importer['uid']),
		dbesc($parent_guid)
	);

	if(!count($r)) {
		$result = diaspora_store_by_guid($parent_guid, $contact['url'], $importer['uid']);

		if (!$result) {
			$person = find_diaspora_person_by_handle($diaspora_handle);
			$result = diaspora_store_by_guid($parent_guid, $person['url'], $importer['uid']);
		}

		if ($result) {
			logger("Fetched missing item ".$parent_guid." - result: ".$result, LOGGER_DEBUG);

			$r = q("SELECT * FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
				intval($importer['uid']),
				dbesc($parent_guid)
			);
		}
	}

	if(! count($r)) {
		logger('diaspora_comment: parent item not found: parent: ' . $parent_guid . ' item: ' . $guid);
		return;
	}
	$parent_item = $r[0];


	/* How Diaspora performs comment signature checking:

	   - If an item has been sent by the comment author to the top-level post owner to relay on
	     to the rest of the contacts on the top-level post, the top-level post owner should check
	     the author_signature, then create a parent_author_signature before relaying the comment on
	   - If an item has been relayed on by the top-level post owner, the contacts who receive it
	     check only the parent_author_signature. Basically, they trust that the top-level post
	     owner has already verified the authenticity of anything he/she sends out
	   - In either case, the signature that get checked is the signature created by the person
	     who sent the salmon
	*/

	$signed_data = $guid . ';' . $parent_guid . ';' . $text . ';' . $diaspora_handle;
	$key = $msg['key'];

	if($parent_author_signature) {
		// If a parent_author_signature exists, then we've received the comment
		// relayed from the top-level post owner. There's no need to check the
		// author_signature if the parent_author_signature is valid

		$parent_author_signature = base64_decode($parent_author_signature);

		if(! rsa_verify($signed_data,$parent_author_signature,$key,'sha256')) {
			logger('diaspora_comment: top-level owner verification failed.');
			return;
		}
	}
	else {
		// If there's no parent_author_signature, then we've received the comment
		// from the comment creator. In that case, the person is commenting on
		// our post, so he/she must be a contact of ours and his/her public key
		// should be in $msg['key']

		$author_signature = base64_decode($author_signature);

		if(! rsa_verify($signed_data,$author_signature,$key,'sha256')) {
			logger('diaspora_comment: comment author verification failed.');
			return;
		}
	}

	// Phew! Everything checks out. Now create an item.

	// Find the original comment author information.
	// We need this to make sure we display the comment author
	// information (name and avatar) correctly.
	if(strcasecmp($diaspora_handle,$msg['author']) == 0)
		$person = $contact;
	else {
		$person = find_diaspora_person_by_handle($diaspora_handle);

		if(! is_array($person)) {
			logger('diaspora_comment: unable to find author details');
			return;
		}
	}

	// Fetch the contact id - if we know this contact
	$r = q("SELECT `id`, `network` FROM `contact` WHERE `nurl` = '%s' AND `uid` = %d LIMIT 1",
		dbesc(normalise_link($person['url'])), intval($importer['uid']));
	if ($r) {
		$cid = $r[0]['id'];
		$network = $r[0]['network'];
	} else {
		$cid = $contact['id'];
		$network = NETWORK_DIASPORA;
	}

	$body = diaspora2bb($text);
	$message_id = $diaspora_handle . ':' . $guid;

	$datarray = array();

	$datarray['uid'] = $importer['uid'];
	$datarray['contact-id'] = $cid;
	$datarray['type'] = 'remote-comment';
	$datarray['wall'] = $parent_item['wall'];
	$datarray['network']  = $network;
	$datarray['verb'] = ACTIVITY_POST;
	$datarray['gravity'] = GRAVITY_COMMENT;
	$datarray['guid'] = $guid;
	$datarray['uri'] = $message_id;
	$datarray['parent-uri'] = $parent_item['uri'];

	// No timestamps for comments? OK, we'll the use current time.
	$datarray['changed'] = $datarray['created'] = $datarray['edited'] = datetime_convert();
	$datarray['private'] = $parent_item['private'];

	$datarray['owner-name'] = $parent_item['owner-name'];
	$datarray['owner-link'] = $parent_item['owner-link'];
	$datarray['owner-avatar'] = $parent_item['owner-avatar'];

	$datarray['author-name'] = $person['name'];
	$datarray['author-link'] = $person['url'];
	$datarray['author-avatar'] = ((x($person,'thumb')) ? $person['thumb'] : $person['photo']);
	$datarray['body'] = $body;
	$datarray["object"] = json_encode($xml);
	$datarray["object-type"] = ACTIVITY_OBJ_COMMENT;

	// We can't be certain what the original app is if the message is relayed.
	if(($parent_item['origin']) && (! $parent_author_signature))
		$datarray['app']  = 'Diaspora';

	DiasporaFetchGuid($datarray);
	$message_id = item_store($datarray);

	$datarray['id'] = $message_id;

	//if($message_id) {
		//q("update item set plink = '%s' where id = %d",
		//	//dbesc($a->get_baseurl() . '/display/' . $importer['nickname'] . '/' . $message_id),
		//	dbesc($a->get_baseurl().'/display/'.$datarray['guid']),
		//	intval($message_id)
		//);
	//}

	// If we are the origin of the parent we store the original signature and notify our followers
	if($parent_item['origin']) {
		$author_signature_base64 = base64_encode($author_signature);
		$author_signature_base64 = diaspora_repair_signature($author_signature_base64, $diaspora_handle);

		q("insert into sign (`iid`,`signed_text`,`signature`,`signer`) values (%d,'%s','%s','%s') ",
			intval($message_id),
			dbesc($signed_data),
			dbesc($author_signature_base64),
			dbesc($diaspora_handle)
		);

		// notify others
		proc_run('php','include/notifier.php','comment-import',$message_id);
	}

	return;
}




function diaspora_conversation($importer,$xml,$msg) {

	$a = get_app();

	$guid = notags(unxmlify($xml->guid));
	$subject = notags(unxmlify($xml->subject));
	$diaspora_handle = notags(unxmlify($xml->diaspora_handle));
	$participant_handles = notags(unxmlify($xml->participant_handles));
	$created_at = datetime_convert('UTC','UTC',notags(unxmlify($xml->created_at)));

	$parent_uri = $diaspora_handle . ':' . $guid;

	$messages = $xml->message;

	if(! count($messages)) {
		logger('diaspora_conversation: empty conversation');
		return;
	}

	$contact = diaspora_get_contact_by_handle($importer['uid'],$msg['author']);
	if(! $contact) {
		logger('diaspora_conversation: cannot find contact: ' . $msg['author']);
		return;
	}

	if(($contact['rel'] == CONTACT_IS_FOLLOWER) || ($contact['blocked']) || ($contact['readonly'])) {
		logger('diaspora_conversation: Ignoring this author.');
		return 202;
	}

	$conversation = null;

	$c = q("select * from conv where uid = %d and guid = '%s' limit 1",
		intval($importer['uid']),
		dbesc($guid)
	);
	if(count($c))
		$conversation = $c[0];
	else {
		$r = q("insert into conv (uid,guid,creator,created,updated,subject,recips) values(%d, '%s', '%s', '%s', '%s', '%s', '%s') ",
			intval($importer['uid']),
			dbesc($guid),
			dbesc($diaspora_handle),
			dbesc(datetime_convert('UTC','UTC',$created_at)),
			dbesc(datetime_convert()),
			dbesc($subject),
			dbesc($participant_handles)
		);
		if($r)
			$c = q("select * from conv where uid = %d and guid = '%s' limit 1",
		intval($importer['uid']),
	    dbesc($guid)
	);
	    if(count($c))
	    $conversation = $c[0];
	}
	if(! $conversation) {
		logger('diaspora_conversation: unable to create conversation.');
		return;
	}

	foreach($messages as $mesg) {

		$reply = 0;

		$msg_guid = notags(unxmlify($mesg->guid));
		$msg_parent_guid = notags(unxmlify($mesg->parent_guid));
		$msg_parent_author_signature = notags(unxmlify($mesg->parent_author_signature));
		$msg_author_signature = notags(unxmlify($mesg->author_signature));
		$msg_text = unxmlify($mesg->text);
		$msg_created_at = datetime_convert('UTC','UTC',notags(unxmlify($mesg->created_at)));
		$msg_diaspora_handle = notags(unxmlify($mesg->diaspora_handle));
		$msg_conversation_guid = notags(unxmlify($mesg->conversation_guid));
		if($msg_conversation_guid != $guid) {
			logger('diaspora_conversation: message conversation guid does not belong to the current conversation. ' . $xml);
			continue;
		}

		$body = diaspora2bb($msg_text);
		$message_id = $msg_diaspora_handle . ':' . $msg_guid;

		$author_signed_data = $msg_guid . ';' . $msg_parent_guid . ';' . $msg_text . ';' . unxmlify($mesg->created_at) . ';' . $msg_diaspora_handle . ';' . $msg_conversation_guid;

		$author_signature = base64_decode($msg_author_signature);

		if(strcasecmp($msg_diaspora_handle,$msg['author']) == 0) {
			$person = $contact;
			$key = $msg['key'];
		}
		else {
			$person = find_diaspora_person_by_handle($msg_diaspora_handle);	

			if(is_array($person) && x($person,'pubkey'))
				$key = $person['pubkey'];
			else {
				logger('diaspora_conversation: unable to find author details');
				continue;
			}
		}

		if(! rsa_verify($author_signed_data,$author_signature,$key,'sha256')) {
			logger('diaspora_conversation: verification failed.');
			continue;
		}

		if($msg_parent_author_signature) {
			$owner_signed_data = $msg_guid . ';' . $msg_parent_guid . ';' . $msg_text . ';' . unxmlify($mesg->created_at) . ';' . $msg_diaspora_handle . ';' . $msg_conversation_guid;

			$parent_author_signature = base64_decode($msg_parent_author_signature);

			$key = $msg['key'];

			if(! rsa_verify($owner_signed_data,$parent_author_signature,$key,'sha256')) {
				logger('diaspora_conversation: owner verification failed.');
				continue;
			}
		}

		$r = q("select id from mail where `uri` = '%s' limit 1",
			dbesc($message_id)
		);
		if(count($r)) {
			logger('diaspora_conversation: duplicate message already delivered.', LOGGER_DEBUG);
			continue;
		}

		q("insert into mail ( `uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`) values ( %d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
			intval($importer['uid']),
			dbesc($msg_guid),
			intval($conversation['id']),
			dbesc($person['name']),
			dbesc($person['photo']),
			dbesc($person['url']),
			intval($contact['id']),
			dbesc($subject),
			dbesc($body),
			0,
			0,
			dbesc($message_id),
			dbesc($parent_uri),
			dbesc($msg_created_at)
		);

		q("update conv set updated = '%s' where id = %d",
			dbesc(datetime_convert()),
			intval($conversation['id'])
		);

		notification(array(
			'type' => NOTIFY_MAIL,
			'notify_flags' => $importer['notify-flags'],
			'language' => $importer['language'],
			'to_name' => $importer['username'],
			'to_email' => $importer['email'],
			'uid' =>$importer['uid'],
			'item' => array('subject' => $subject, 'body' => $body),
			'source_name' => $person['name'],
			'source_link' => $person['url'],
			'source_photo' => $person['thumb'],
			'verb' => ACTIVITY_POST,
			'otype' => 'mail'
		));
	}

	return;
}

function diaspora_message($importer,$xml,$msg) {

	$a = get_app();

	$msg_guid = notags(unxmlify($xml->guid));
	$msg_parent_guid = notags(unxmlify($xml->parent_guid));
	$msg_parent_author_signature = notags(unxmlify($xml->parent_author_signature));
	$msg_author_signature = notags(unxmlify($xml->author_signature));
	$msg_text = unxmlify($xml->text);
	$msg_created_at = datetime_convert('UTC','UTC',notags(unxmlify($xml->created_at)));
	$msg_diaspora_handle = notags(unxmlify($xml->diaspora_handle));
	$msg_conversation_guid = notags(unxmlify($xml->conversation_guid));

	$parent_uri = $msg_diaspora_handle . ':' . $msg_parent_guid;

	$contact = diaspora_get_contact_by_handle($importer['uid'],$msg_diaspora_handle);
	if(! $contact) {
		logger('diaspora_message: cannot find contact: ' . $msg_diaspora_handle);
		return;
	}

	if(($contact['rel'] == CONTACT_IS_FOLLOWER) || ($contact['blocked']) || ($contact['readonly'])) {
		logger('diaspora_message: Ignoring this author.');
		return 202;
	}

	$conversation = null;

	$c = q("select * from conv where uid = %d and guid = '%s' limit 1",
		intval($importer['uid']),
		dbesc($msg_conversation_guid)
	);
	if(count($c))
		$conversation = $c[0];
	else {
		logger('diaspora_message: conversation not available.');
		return;
	}

	$reply = 0;

	$body = diaspora2bb($msg_text);
	$message_id = $msg_diaspora_handle . ':' . $msg_guid;

	$author_signed_data = $msg_guid . ';' . $msg_parent_guid . ';' . $msg_text . ';' . unxmlify($xml->created_at) . ';' . $msg_diaspora_handle . ';' . $msg_conversation_guid;


	$author_signature = base64_decode($msg_author_signature);

	$person = find_diaspora_person_by_handle($msg_diaspora_handle);
	if(is_array($person) && x($person,'pubkey'))
		$key = $person['pubkey'];
	else {
		logger('diaspora_message: unable to find author details');
		return;
	}

	if(! rsa_verify($author_signed_data,$author_signature,$key,'sha256')) {
		logger('diaspora_message: verification failed.');
		return;
	}

	$r = q("select id from mail where `uri` = '%s' and uid = %d limit 1",
		dbesc($message_id),
		intval($importer['uid'])
	);
	if(count($r)) {
		logger('diaspora_message: duplicate message already delivered.', LOGGER_DEBUG);
		return;
	}

	q("insert into mail ( `uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`) values ( %d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
		intval($importer['uid']),
		dbesc($msg_guid),
		intval($conversation['id']),
		dbesc($person['name']),
		dbesc($person['photo']),
		dbesc($person['url']),
		intval($contact['id']),
		dbesc($conversation['subject']),
		dbesc($body),
		0,
		1,
		dbesc($message_id),
		dbesc($parent_uri),
		dbesc($msg_created_at)
	);

	q("update conv set updated = '%s' where id = %d",
		dbesc(datetime_convert()),
		intval($conversation['id'])
	);

	return;
}

function diaspora_participation($importer,$xml) {
	logger("Unsupported message type 'participation' ".print_r($xml, true));
}

function diaspora_photo($importer,$xml,$msg,$attempt=1) {

	$a = get_app();

	logger('diaspora_photo: init',LOGGER_DEBUG);

	$remote_photo_path = notags(unxmlify($xml->remote_photo_path));

	$remote_photo_name = notags(unxmlify($xml->remote_photo_name));

	$status_message_guid = notags(unxmlify($xml->status_message_guid));

	$guid = notags(unxmlify($xml->guid));

	$diaspora_handle = notags(unxmlify($xml->diaspora_handle));

	$public = notags(unxmlify($xml->public));

	$created_at = notags(unxmlify($xml_created_at));

	logger('diaspora_photo: status_message_guid: ' . $status_message_guid, LOGGER_DEBUG);

	$contact = diaspora_get_contact_by_handle($importer['uid'],$msg['author']);
	if(! $contact) {
		logger('diaspora_photo: contact record not found: ' . $msg['author'] . ' handle: ' . $diaspora_handle);
		return;
	}

	if(! diaspora_post_allow($importer,$contact, false)) {
		logger('diaspora_photo: Ignoring this author.');
		return 202;
	}

	$r = q("SELECT * FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
		intval($importer['uid']),
		dbesc($status_message_guid)
	);

/*	deactivated by now since it can lead to multiplicated pictures in posts.
	if(!count($r)) {
		$result = diaspora_store_by_guid($status_message_guid, $contact['url'], $importer['uid']);

		if (!$result) {
			$person = find_diaspora_person_by_handle($diaspora_handle);
			$result = diaspora_store_by_guid($status_message_guid, $person['url'], $importer['uid']);
		}

		if ($result) {
			logger("Fetched missing item ".$status_message_guid." - result: ".$result, LOGGER_DEBUG);

			$r = q("SELECT * FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
				intval($importer['uid']),
				dbesc($status_message_guid)
			);
		}
	}
*/
	if(!count($r)) {
		if($attempt <= 3) {
			q("INSERT INTO dsprphotoq (uid, msg, attempt) VALUES (%d, '%s', %d)",
			   intval($importer['uid']),
			   dbesc(serialize($msg)),
			   intval($attempt + 1)
			);
		}

		logger('diaspora_photo: attempt = ' . $attempt . '; status message not found: ' . $status_message_guid . ' for photo: ' . $guid);
		return;
	}

	$parent_item = $r[0];

	$link_text = '[img]' . $remote_photo_path . $remote_photo_name . '[/img]' . "\n";

	$link_text = scale_external_images($link_text, true,
					   array($remote_photo_name, 'scaled_full_' . $remote_photo_name));

	if(strpos($parent_item['body'],$link_text) === false) {

		$parent_item['body'] = $link_text . $parent_item['body'];

		$r = q("UPDATE `item` SET `body` = '%s', `visible` = 1 WHERE `id` = %d AND `uid` = %d",
			dbesc($parent_item['body']),
			intval($parent_item['id']),
			intval($parent_item['uid'])
		);
		put_item_in_cache($parent_item, true);
		update_thread($parent_item['id']);
	}

	return;
}




function diaspora_like($importer,$xml,$msg) {

	$a = get_app();
	$guid = notags(unxmlify($xml->guid));
	$parent_guid = notags(unxmlify($xml->parent_guid));
	$diaspora_handle = notags(unxmlify($xml->diaspora_handle));
	$target_type = notags(unxmlify($xml->target_type));
	$positive = notags(unxmlify($xml->positive));
	$author_signature = notags(unxmlify($xml->author_signature));

	$parent_author_signature = (($xml->parent_author_signature) ? notags(unxmlify($xml->parent_author_signature)) : '');

	// likes on comments not supported here and likes on photos not supported by Diaspora

//	if($target_type !== 'Post')
//		return;

	$contact = diaspora_get_contact_by_handle($importer['uid'],$msg['author']);
	if(! $contact) {
		logger('diaspora_like: cannot find contact: ' . $msg['author']);
		return;
	}

	if(! diaspora_post_allow($importer,$contact, false)) {
		logger('diaspora_like: Ignoring this author.');
		return 202;
	}

	$r = q("SELECT * FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
		intval($importer['uid']),
		dbesc($parent_guid)
	);

	if(!count($r)) {
		$result = diaspora_store_by_guid($parent_guid, $contact['url'], $importer['uid']);

		if (!$result) {
			$person = find_diaspora_person_by_handle($diaspora_handle);
			$result = diaspora_store_by_guid($parent_guid, $person['url'], $importer['uid']);
		}

		if ($result) {
			logger("Fetched missing item ".$parent_guid." - result: ".$result, LOGGER_DEBUG);

			$r = q("SELECT * FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
				intval($importer['uid']),
				dbesc($parent_guid)
			);
		}
	}

	if(! count($r)) {
		logger('diaspora_like: parent item not found: ' . $guid);
		return;
	}

	$parent_item = $r[0];

	$r = q("SELECT * FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
		intval($importer['uid']),
		dbesc($guid)
	);
	if(count($r)) {
		if($positive === 'true') {
			logger('diaspora_like: duplicate like: ' . $guid);
			return;
		}
		// Note: I don't think "Like" objects with positive = "false" are ever actually used
		// It looks like "RelayableRetractions" are used for "unlike" instead
		if($positive === 'false') {
			logger('diaspora_like: received a like with positive set to "false"...ignoring');
/*			q("UPDATE `item` SET `deleted` = 1 WHERE `id` = %d AND `uid` = %d",
				intval($r[0]['id']),
				intval($importer['uid'])
			);*/
			// FIXME--actually don't unless it turns out that Diaspora does indeed send out "false" likes
			//  send notification via proc_run()
			return;
		}
	}
	// Note: I don't think "Like" objects with positive = "false" are ever actually used
	// It looks like "RelayableRetractions" are used for "unlike" instead
	if($positive === 'false') {
		logger('diaspora_like: received a like with positive set to "false"');
		logger('diaspora_like: unlike received with no corresponding like...ignoring');
		return;
	}


	/* How Diaspora performs "like" signature checking:

	   - If an item has been sent by the like author to the top-level post owner to relay on
	     to the rest of the contacts on the top-level post, the top-level post owner should check
	     the author_signature, then create a parent_author_signature before relaying the like on
	   - If an item has been relayed on by the top-level post owner, the contacts who receive it
	     check only the parent_author_signature. Basically, they trust that the top-level post
	     owner has already verified the authenticity of anything he/she sends out
	   - In either case, the signature that get checked is the signature created by the person
	     who sent the salmon
	*/

	// Diaspora has changed the way they are signing the likes.
	// Just to make sure that we don't miss any likes we will check the old and the current way.
	$old_signed_data = $guid . ';' . $target_type . ';' . $parent_guid . ';' . $positive . ';' . $diaspora_handle;

	$signed_data = $positive . ';' . $guid . ';' . $target_type . ';' . $parent_guid . ';' . $diaspora_handle;

	$key = $msg['key'];

	if ($parent_author_signature) {
		// If a parent_author_signature exists, then we've received the like
		// relayed from the top-level post owner. There's no need to check the
		// author_signature if the parent_author_signature is valid

		$parent_author_signature = base64_decode($parent_author_signature);

		if (!rsa_verify($signed_data,$parent_author_signature,$key,'sha256') AND
			!rsa_verify($old_signed_data,$parent_author_signature,$key,'sha256')) {

			logger('diaspora_like: top-level owner verification failed.');
			return;
		}
	} else {
		// If there's no parent_author_signature, then we've received the like
		// from the like creator. In that case, the person is "like"ing
		// our post, so he/she must be a contact of ours and his/her public key
		// should be in $msg['key']

		$author_signature = base64_decode($author_signature);

		if (!rsa_verify($signed_data,$author_signature,$key,'sha256') AND
			!rsa_verify($old_signed_data,$author_signature,$key,'sha256')) {

			logger('diaspora_like: like creator verification failed.');
			return;
		}
	}

	// Phew! Everything checks out. Now create an item.

	// Find the original comment author information.
	// We need this to make sure we display the comment author
	// information (name and avatar) correctly.
	if(strcasecmp($diaspora_handle,$msg['author']) == 0)
		$person = $contact;
	else {
		$person = find_diaspora_person_by_handle($diaspora_handle);

		if(! is_array($person)) {
			logger('diaspora_like: unable to find author details');
			return;
		}
	}

	$uri = $diaspora_handle . ':' . $guid;

	$activity = ACTIVITY_LIKE;
	$post_type = (($parent_item['resource-id']) ? t('photo') : t('status'));
	$objtype = (($parent_item['resource-id']) ? ACTIVITY_OBJ_PHOTO : ACTIVITY_OBJ_NOTE );
	$link = xmlify('<link rel="alternate" type="text/html" href="' . $a->get_baseurl() . '/display/' . $importer['nickname'] . '/' . $parent_item['id'] . '" />' . "\n") ;
	$body = $parent_item['body'];

	$obj = <<< EOT

	<object>
		<type>$objtype</type>
		<local>1</local>
		<id>{$parent_item['uri']}</id>
		<link>$link</link>
		<title></title>
		<content>$body</content>
	</object>
EOT;
	$bodyverb = t('%1$s likes %2$s\'s %3$s');

	// Fetch the contact id - if we know this contact
	$r = q("SELECT `id`, `network` FROM `contact` WHERE `nurl` = '%s' AND `uid` = %d LIMIT 1",
		dbesc(normalise_link($person['url'])), intval($importer['uid']));
	if ($r) {
		$cid = $r[0]['id'];
		$network = $r[0]['network'];
	} else {
		$cid = $contact['id'];
		$network = NETWORK_DIASPORA;
	}

	$arr = array();

	$arr['uri'] = $uri;
	$arr['uid'] = $importer['uid'];
	$arr['guid'] = $guid;
	$arr['network']  = $network;
	$arr['contact-id'] = $cid;
	$arr['type'] = 'activity';
	$arr['wall'] = $parent_item['wall'];
	$arr['gravity'] = GRAVITY_LIKE;
	$arr['parent'] = $parent_item['id'];
	$arr['parent-uri'] = $parent_item['uri'];

	$arr['owner-name'] = $parent_item['name'];
	$arr['owner-link'] = $parent_item['url'];
	//$arr['owner-avatar'] = $parent_item['thumb'];
	$arr['owner-avatar'] = ((x($parent_item,'thumb')) ? $parent_item['thumb'] : $parent_item['photo']);

	$arr['author-name'] = $person['name'];
	$arr['author-link'] = $person['url'];
	$arr['author-avatar'] = ((x($person,'thumb')) ? $person['thumb'] : $person['photo']);

	$ulink = '[url=' . $contact['url'] . ']' . $contact['name'] . '[/url]';
	$alink = '[url=' . $parent_item['author-link'] . ']' . $parent_item['author-name'] . '[/url]';
	//$plink = '[url=' . $a->get_baseurl() . '/display/' . $importer['nickname'] . '/' . $parent_item['id'] . ']' . $post_type . '[/url]';
	$plink = '[url='.$a->get_baseurl().'/display/'.urlencode($guid).']'.$post_type.'[/url]';
	$arr['body'] =  sprintf( $bodyverb, $ulink, $alink, $plink );

	$arr['app']  = 'Diaspora';

	$arr['private'] = $parent_item['private'];
	$arr['verb'] = $activity;
	$arr['object-type'] = $objtype;
	$arr['object'] = $obj;
	$arr['visible'] = 1;
	$arr['unseen'] = 1;
	$arr['last-child'] = 0;

	$message_id = item_store($arr);


	//if($message_id) {
	//	q("update item set plink = '%s' where id = %d",
	//		//dbesc($a->get_baseurl() . '/display/' . $importer['nickname'] . '/' . $message_id),
	//		dbesc($a->get_baseurl().'/display/'.$guid),
	//		intval($message_id)
	//	);
	//}

	// If we are the origin of the parent we store the original signature and notify our followers
	if($parent_item['origin']) {
		$author_signature_base64 = base64_encode($author_signature);
		$author_signature_base64 = diaspora_repair_signature($author_signature_base64, $diaspora_handle);

		q("insert into sign (`iid`,`signed_text`,`signature`,`signer`) values (%d,'%s','%s','%s') ",
			intval($message_id),
			dbesc($signed_data),
			dbesc($author_signature_base64),
			dbesc($diaspora_handle)
		);

		// notify others
		proc_run('php','include/notifier.php','comment-import',$message_id);
	}

	return;
}

function diaspora_retraction($importer,$xml) {


	$guid = notags(unxmlify($xml->guid));
	$diaspora_handle = notags(unxmlify($xml->diaspora_handle));
	$type = notags(unxmlify($xml->type));

	$contact = diaspora_get_contact_by_handle($importer['uid'],$diaspora_handle);
	if(! $contact)
		return;

	if($type === 'Person') {
		require_once('include/Contact.php');
		contact_remove($contact['id']);
	} elseif($type === 'StatusMessage') {
		$guid = notags(unxmlify($xml->post_guid));

		$r = q("SELECT * FROM `item` WHERE `guid` = '%s' AND `uid` = %d AND NOT `file` LIKE '%%[%%' LIMIT 1",
			dbesc($guid),
			intval($importer['uid'])
		);
		if(count($r)) {
			if(link_compare($r[0]['author-link'],$contact['url'])) {
				q("UPDATE `item` SET `deleted` = 1, `changed` = '%s' WHERE `id` = %d",
					dbesc(datetime_convert()),
					intval($r[0]['id'])
				);
				delete_thread($r[0]['id'], $r[0]['parent-uri']);
			}
		}
	} elseif($type === 'Post') {
		$r = q("select * from item where guid = '%s' and uid = %d and not file like '%%[%%' limit 1",
			dbesc('guid'),
			intval($importer['uid'])
		);
		if(count($r)) {
			if(link_compare($r[0]['author-link'],$contact['url'])) {
				q("update item set `deleted` = 1, `changed` = '%s' where `id` = %d",
					dbesc(datetime_convert()),
					intval($r[0]['id'])
				);
				delete_thread($r[0]['id'], $r[0]['parent-uri']);
			}
		}
	}

	return 202;
	// NOTREACHED
}

function diaspora_signed_retraction($importer,$xml,$msg) {


	$guid = notags(unxmlify($xml->target_guid));
	$diaspora_handle = notags(unxmlify($xml->sender_handle));
	$type = notags(unxmlify($xml->target_type));
	$sig = notags(unxmlify($xml->target_author_signature));

	$parent_author_signature = (($xml->parent_author_signature) ? notags(unxmlify($xml->parent_author_signature)) : '');

	$contact = diaspora_get_contact_by_handle($importer['uid'],$diaspora_handle);
	if(! $contact) {
		logger('diaspora_signed_retraction: no contact ' . $diaspora_handle . ' for ' . $importer['uid']);
		return;
	}


	$signed_data = $guid . ';' . $type ;
	$key = $msg['key'];

	/* How Diaspora performs relayable_retraction signature checking:

	   - If an item has been sent by the item author to the top-level post owner to relay on
	     to the rest of the contacts on the top-level post, the top-level post owner checks
	     the author_signature, then creates a parent_author_signature before relaying the item on
	   - If an item has been relayed on by the top-level post owner, the contacts who receive it
	     check only the parent_author_signature. Basically, they trust that the top-level post
	     owner has already verified the authenticity of anything he/she sends out
	   - In either case, the signature that get checked is the signature created by the person
	     who sent the salmon
	*/

	if($parent_author_signature) {

		$parent_author_signature = base64_decode($parent_author_signature);

		if(! rsa_verify($signed_data,$parent_author_signature,$key,'sha256')) {
			logger('diaspora_signed_retraction: top-level post owner verification failed');
			return;
		}

	} else {

		$sig_decode = base64_decode($sig);

		if(! rsa_verify($signed_data,$sig_decode,$key,'sha256')) {
			logger('diaspora_signed_retraction: retraction owner verification failed.' . print_r($msg,true));
			return;
		}
	}

	if($type === 'StatusMessage' || $type === 'Comment' || $type === 'Like') {
		$r = q("select * from item where guid = '%s' and uid = %d and not file like '%%[%%' limit 1",
			dbesc($guid),
			intval($importer['uid'])
		);
		if(count($r)) {
			if(link_compare($r[0]['author-link'],$contact['url'])) {
				q("update item set `deleted` = 1, `edited` = '%s', `changed` = '%s', `body` = '' , `title` = '' where `id` = %d",
					dbesc(datetime_convert()),
					dbesc(datetime_convert()),
					intval($r[0]['id'])
				);
				delete_thread($r[0]['id'], $r[0]['parent-uri']);

				// Now check if the retraction needs to be relayed by us
				//
				// The first item in the `item` table with the parent id is the parent. However, MySQL doesn't always
				// return the items ordered by `item`.`id`, in which case the wrong item is chosen as the parent.
				// The only item with `parent` and `id` as the parent id is the parent item.
				$p = q("SELECT `origin` FROM `item` WHERE `parent` = %d AND `id` = %d LIMIT 1",
					intval($r[0]['parent']),
					intval($r[0]['parent'])
				);
				if(count($p)) {
					if($p[0]['origin']) {
						q("insert into sign (`retract_iid`,`signed_text`,`signature`,`signer`) values (%d,'%s','%s','%s') ",
							$r[0]['id'],
							dbesc($signed_data),
							dbesc($sig),
							dbesc($diaspora_handle)
						);

						// the existence of parent_author_signature would have meant the parent_author or owner
						// is already relaying.
						logger('diaspora_signed_retraction: relaying relayable_retraction');

						proc_run('php','include/notifier.php','drop',$r[0]['id']);
					}
				}
			}
		}
	}
	else
		logger('diaspora_signed_retraction: unknown type: ' . $type);

	return 202;
	// NOTREACHED
}

function diaspora_profile($importer,$xml,$msg) {

	$a = get_app();
	$diaspora_handle = notags(unxmlify($xml->diaspora_handle));


	if($diaspora_handle != $msg['author']) {
		logger('diaspora_post: Potential forgery. Message handle is not the same as envelope sender.');
		return 202;
	}

	$contact = diaspora_get_contact_by_handle($importer['uid'],$diaspora_handle);
	if(! $contact)
		return;

	//if($contact['blocked']) {
	//	logger('diaspora_post: Ignoring this author.');
	//	return 202;
	//}

	$name = unxmlify($xml->first_name) . ((strlen($xml->last_name)) ? ' ' . unxmlify($xml->last_name) : '');
	$image_url = unxmlify($xml->image_url);
	$birthday = unxmlify($xml->birthday);
	$location = diaspora2bb(unxmlify($xml->location));
	$about = diaspora2bb(unxmlify($xml->bio));
	$gender = unxmlify($xml->gender);
	$searchable = (unxmlify($xml->searchable) == "true");
	$nsfw = (unxmlify($xml->nsfw) == "true");
	$tags = unxmlify($xml->tag_string);

	$tags = explode("#", $tags);

	$keywords = array();
	foreach ($tags as $tag) {
		$tag = trim(strtolower($tag));
		if ($tag != "")
			$keywords[] = $tag;
	}

	$keywords = implode(", ", $keywords);

	$handle_parts = explode("@", $diaspora_handle);
	$nick = $handle_parts[0];

	if($name === '') {
		$name = $handle_parts[0];
	}

	if( preg_match("|^https?://|", $image_url) === 0) {
		$image_url = "http://" . $handle_parts[1] . $image_url;
	}

/*	$r = q("SELECT DISTINCT ( `resource-id` ) FROM `photo` WHERE  `uid` = %d AND `contact-id` = %d AND `album` = 'Contact Photos' ",
		intval($importer['uid']),
		intval($contact['id'])
	);
	$oldphotos = ((count($r)) ? $r : null);*/

	require_once('include/Photo.php');

	$images = import_profile_photo($image_url,$importer['uid'],$contact['id']);

	// Generic birthday. We don't know the timezone. The year is irrelevant.

	$birthday = str_replace('1000','1901',$birthday);

	if ($birthday != "")
		$birthday = datetime_convert('UTC','UTC',$birthday,'Y-m-d');

	// this is to prevent multiple birthday notifications in a single year
	// if we already have a stored birthday and the 'm-d' part hasn't changed, preserve the entry, which will preserve the notify year

	if(substr($birthday,5) === substr($contact['bd'],5))
		$birthday = $contact['bd'];

	/// @TODO Update name on item['author-name'] if the name changed. See consume_feed()
	/// (Not doing this currently because D* protocol is scheduled for revision soon).

	$r = q("UPDATE `contact` SET `name` = '%s', `nick` = '%s', `addr` = '%s', `name-date` = '%s', `photo` = '%s', `thumb` = '%s', `micro` = '%s', `avatar-date` = '%s' , `bd` = '%s', `location` = '%s', `about` = '%s', `keywords` = '%s', `gender` = '%s' WHERE `id` = %d AND `uid` = %d",
		dbesc($name),
		dbesc($nick),
		dbesc($diaspora_handle),
		dbesc(datetime_convert()),
		dbesc($image_url),
		dbesc($images[1]),
		dbesc($images[2]),
		dbesc(datetime_convert()),
		dbesc($birthday),
		dbesc($location),
		dbesc($about),
		dbesc($keywords),
		dbesc($gender),
		intval($contact['id']),
		intval($importer['uid'])
	);

	if ($searchable) {
		require_once('include/socgraph.php');
		poco_check($contact['url'], $name, NETWORK_DIASPORA, $image_url, $about, $location, $gender, $keywords, "",
			datetime_convert(), 2, $contact['id'], $importer['uid']);
	}

	update_gcontact(array("url" => $contact['url'], "network" => NETWORK_DIASPORA, "generation" => 2,
				"photo" => $image_url, "name" => $name, "location" => $location,
				"about" => $about, "birthday" => $birthday, "gender" => $gender,
				"addr" => $diaspora_handle, "nick" => $nick, "keywords" => $keywords,
				"hide" => !$searchable, "nsfw" => $nsfw));

/*	if($r) {
		if($oldphotos) {
			foreach($oldphotos as $ph) {
				q("DELETE FROM `photo` WHERE `uid` = %d AND `contact-id` = %d AND `album` = 'Contact Photos' AND `resource-id` = '%s' ",
					intval($importer['uid']),
					intval($contact['id']),
					dbesc($ph['resource-id'])
				);
			}
		}
	}	*/

	return;

}

function diaspora_share($me,$contact) {
	$a = get_app();
	$myaddr = $me['nickname'] . '@' .  substr($a->get_baseurl(), strpos($a->get_baseurl(),'://') + 3);
	$theiraddr = $contact['addr'];

	$tpl = get_markup_template('diaspora_share.tpl');
	$msg = replace_macros($tpl, array(
		'$sender' => $myaddr,
		'$recipient' => $theiraddr
	));

	$slap = 'xml=' . urlencode(urlencode(diaspora_msg_build($msg,$me,$contact,$me['prvkey'],$contact['pubkey'])));
	//$slap = 'xml=' . urlencode(diaspora_msg_build($msg,$me,$contact,$me['prvkey'],$contact['pubkey']));

	return(diaspora_transmit($owner,$contact,$slap, false));
}

function diaspora_unshare($me,$contact) {

	$a = get_app();
	$myaddr = $me['nickname'] . '@' .  substr($a->get_baseurl(), strpos($a->get_baseurl(),'://') + 3);

	$tpl = get_markup_template('diaspora_retract.tpl');
	$msg = replace_macros($tpl, array(
		'$guid'   => $me['guid'],
		'$type'   => 'Person',
		'$handle' => $myaddr
	));

	$slap = 'xml=' . urlencode(urlencode(diaspora_msg_build($msg,$me,$contact,$me['prvkey'],$contact['pubkey'])));
	//$slap = 'xml=' . urlencode(diaspora_msg_build($msg,$me,$contact,$me['prvkey'],$contact['pubkey']));

	return(diaspora_transmit($owner,$contact,$slap, false));

}


function diaspora_send_status($item,$owner,$contact,$public_batch = false) {

	$a = get_app();
	$myaddr = $owner['nickname'] . '@' . substr($a->get_baseurl(), strpos($a->get_baseurl(),'://') + 3);
	$theiraddr = $contact['addr'];

	$images = array();

	$title = $item['title'];
	$body = $item['body'];

/*
	// We're trying to match Diaspora's split message/photo protocol but
	// all the photos are displayed on D* as links and not img's - even
	// though we're sending pretty much precisely what they send us when
	// doing the same operation.  
	// Commented out for now, we'll use bb2diaspora to convert photos to markdown
	// which seems to get through intact.

	$cnt = preg_match_all('|\[img\](.*?)\[\/img\]|',$body,$matches,PREG_SET_ORDER);
	if($cnt) {
		foreach($matches as $mtch) {
			$detail = array();
			$detail['str'] = $mtch[0];
			$detail['path'] = dirname($mtch[1]) . '/';
			$detail['file'] = basename($mtch[1]);
			$detail['guid'] = $item['guid'];
			$detail['handle'] = $myaddr;
			$images[] = $detail;
			$body = str_replace($detail['str'],$mtch[1],$body);
		}
	}
*/

	//if(strlen($title))
	//	$body = "[b]".html_entity_decode($title)."[/b]\n\n".$body;

	// convert to markdown
	$body = xmlify(html_entity_decode(bb2diaspora($body)));
	//$body = bb2diaspora($body);

	// Adding the title
	if(strlen($title))
		$body = "## ".html_entity_decode($title)."\n\n".$body;

	if($item['attach']) {
		$cnt = preg_match_all('/href=\"(.*?)\"(.*?)title=\"(.*?)\"/ism',$item['attach'],$matches,PREG_SET_ORDER);
		if(cnt) {
			$body .= "\n" . t('Attachments:') . "\n";
			foreach($matches as $mtch) {
				$body .= '[' . $mtch[3] . '](' . $mtch[1] . ')' . "\n";
			}
		}
	}


	$public = (($item['private']) ? 'false' : 'true');

	require_once('include/datetime.php');
	$created = datetime_convert('UTC','UTC',$item['created'],'Y-m-d H:i:s \U\T\C');

	// Detect a share element and do a reshare
	// see: https://github.com/Raven24/diaspora-federation/blob/master/lib/diaspora-federation/entities/reshare.rb
	if (!$item['private'] AND ($ret = diaspora_is_reshare($item["body"]))) {
		$tpl = get_markup_template('diaspora_reshare.tpl');
		$msg = replace_macros($tpl, array(
			'$root_handle' => xmlify($ret['root_handle']),
			'$root_guid' => $ret['root_guid'],
			'$guid' => $item['guid'],
			'$handle' => xmlify($myaddr),
			'$public' => $public,
			'$created' => $created,
			'$provider' => $item["app"]
		));
	} else {
		$tpl = get_markup_template('diaspora_post.tpl');
		$msg = replace_macros($tpl, array(
			'$body' => $body,
			'$guid' => $item['guid'],
			'$handle' => xmlify($myaddr),
			'$public' => $public,
			'$created' => $created,
			'$provider' => $item["app"]
		));
	}

	logger('diaspora_send_status: '.$owner['username'].' -> '.$contact['name'].' base message: '.$msg, LOGGER_DATA);
	logger('send guid '.$item['guid'], LOGGER_DEBUG);

	$slap = 'xml=' . urlencode(urlencode(diaspora_msg_build($msg,$owner,$contact,$owner['uprvkey'],$contact['pubkey'],$public_batch)));
	//$slap = 'xml=' . urlencode(diaspora_msg_build($msg,$owner,$contact,$owner['uprvkey'],$contact['pubkey'],$public_batch));

	$return_code = diaspora_transmit($owner,$contact,$slap,$public_batch,false,$item['guid']);

	logger('diaspora_send_status: guid: '.$item['guid'].' result '.$return_code, LOGGER_DEBUG);

	if(count($images)) {
		diaspora_send_images($item,$owner,$contact,$images,$public_batch);
	}

	return $return_code;
}

function diaspora_is_reshare($body) {
	$body = trim($body);

	// Skip if it isn't a pure repeated messages
	// Does it start with a share?
	if (strpos($body, "[share") > 0)
		return(false);

	// Does it end with a share?
	if (strlen($body) > (strrpos($body, "[/share]") + 8))
		return(false);

	$attributes = preg_replace("/\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism","$1",$body);
	// Skip if there is no shared message in there
	if ($body == $attributes)
		return(false);

	$guid = "";
	preg_match("/guid='(.*?)'/ism", $attributes, $matches);
	if ($matches[1] != "")
		$guid = $matches[1];

	preg_match('/guid="(.*?)"/ism', $attributes, $matches);
	if ($matches[1] != "")
		$guid = $matches[1];

	if ($guid != "") {
		$r = q("SELECT `contact-id` FROM `item` WHERE `guid` = '%s' AND `network` IN ('%s', '%s') LIMIT 1",
			dbesc($guid), NETWORK_DFRN, NETWORK_DIASPORA);
		if ($r) {
			$ret= array();
			$ret["root_handle"] = diaspora_handle_from_contact($r[0]["contact-id"]);
			$ret["root_guid"] = $guid;
			return($ret);
		}
	}

	$profile = "";
	preg_match("/profile='(.*?)'/ism", $attributes, $matches);
	if ($matches[1] != "")
		$profile = $matches[1];

	preg_match('/profile="(.*?)"/ism', $attributes, $matches);
	if ($matches[1] != "")
		$profile = $matches[1];

	$ret= array();

	$ret["root_handle"] = preg_replace("=https?://(.*)/u/(.*)=ism", "$2@$1", $profile);
	if (($ret["root_handle"] == $profile) OR ($ret["root_handle"] == ""))
		return(false);

	$link = "";
	preg_match("/link='(.*?)'/ism", $attributes, $matches);
	if ($matches[1] != "")
		$link = $matches[1];

	preg_match('/link="(.*?)"/ism', $attributes, $matches);
	if ($matches[1] != "")
		$link = $matches[1];

	$ret["root_guid"] = preg_replace("=https?://(.*)/posts/(.*)=ism", "$2", $link);
	if (($ret["root_guid"] == $link) OR ($ret["root_guid"] == ""))
		return(false);

	return($ret);
}

function diaspora_send_images($item,$owner,$contact,$images,$public_batch = false) {
	$a = get_app();
	if(! count($images))
		return;
	$mysite = substr($a->get_baseurl(),strpos($a->get_baseurl(),'://') + 3) . '/photo';

	$tpl = get_markup_template('diaspora_photo.tpl');
	foreach($images as $image) {
		if(! stristr($image['path'],$mysite))
			continue;
		$resource = str_replace('.jpg','',$image['file']);
		$resource = substr($resource,0,strpos($resource,'-'));

		$r = q("select * from photo where `resource-id` = '%s' and `uid` = %d limit 1",
			dbesc($resource),
			intval($owner['uid'])
		);
		if(! count($r))
			continue;
		$public = (($r[0]['allow_cid'] || $r[0]['allow_gid'] || $r[0]['deny_cid'] || $r[0]['deny_gid']) ? 'false' : 'true' );
		$msg = replace_macros($tpl,array(
			'$path' => xmlify($image['path']),
			'$filename' => xmlify($image['file']),
			'$msg_guid' => xmlify($image['guid']),
			'$guid' => xmlify($r[0]['guid']),
			'$handle' => xmlify($image['handle']),
			'$public' => xmlify($public),
			'$created_at' => xmlify(datetime_convert('UTC','UTC',$r[0]['created'],'Y-m-d H:i:s \U\T\C'))
		));


		logger('diaspora_send_photo: base message: ' . $msg, LOGGER_DATA);
		logger('send guid '.$r[0]['guid'], LOGGER_DEBUG);

		$slap = 'xml=' . urlencode(urlencode(diaspora_msg_build($msg,$owner,$contact,$owner['uprvkey'],$contact['pubkey'],$public_batch)));
		//$slap = 'xml=' . urlencode(diaspora_msg_build($msg,$owner,$contact,$owner['uprvkey'],$contact['pubkey'],$public_batch));

		diaspora_transmit($owner,$contact,$slap,$public_batch,false,$r[0]['guid']);
	}

}

function diaspora_send_followup($item,$owner,$contact,$public_batch = false) {

	$a = get_app();
	$myaddr = $owner['nickname'] . '@' .  substr($a->get_baseurl(), strpos($a->get_baseurl(),'://') + 3);
//	$theiraddr = $contact['addr'];

	// Diaspora doesn't support threaded comments, but some
	// versions of Diaspora (i.e. Diaspora-pistos) support
	// likes on comments
	if($item['verb'] === ACTIVITY_LIKE && $item['thr-parent']) {
		$p = q("select guid, type, uri, `parent-uri` from item where uri = '%s' limit 1",
			dbesc($item['thr-parent'])
		      );
	}
	else {
		// The first item in the `item` table with the parent id is the parent. However, MySQL doesn't always
		// return the items ordered by `item`.`id`, in which case the wrong item is chosen as the parent.
		// The only item with `parent` and `id` as the parent id is the parent item.
		$p = q("select guid, type, uri, `parent-uri` from item where parent = %d and id = %d limit 1",
			intval($item['parent']),
			intval($item['parent'])
		);
	}
	if(count($p))
		$parent = $p[0];
	else
		return;

	if($item['verb'] === ACTIVITY_LIKE) {
		$tpl = get_markup_template('diaspora_like.tpl');
		$like = true;
		$target_type = ( $parent['uri'] === $parent['parent-uri']  ? 'Post' : 'Comment');
//		$target_type = (strpos($parent['type'], 'comment') ? 'Comment' : 'Post');
//		$positive = (($item['deleted']) ? 'false' : 'true');
		$positive = 'true';

		if(($item['deleted']))
			logger('diaspora_send_followup: received deleted "like". Those should go to diaspora_send_retraction');
	}
	else {
		$tpl = get_markup_template('diaspora_comment.tpl');
		$like = false;
	}

	$text = html_entity_decode(bb2diaspora($item['body']));

	// sign it

	if($like)
		$signed_text =  $positive . ';' . $item['guid'] . ';' . $target_type . ';' . $parent['guid'] . ';' . $myaddr;
	else
		$signed_text = $item['guid'] . ';' . $parent['guid'] . ';' . $text . ';' . $myaddr;

	$authorsig = base64_encode(rsa_sign($signed_text,$owner['uprvkey'],'sha256'));

	$msg = replace_macros($tpl,array(
		'$guid' => xmlify($item['guid']),
		'$parent_guid' => xmlify($parent['guid']),
		'$target_type' =>xmlify($target_type),
		'$authorsig' => xmlify($authorsig),
		'$body' => xmlify($text),
		'$positive' => xmlify($positive),
		'$handle' => xmlify($myaddr)
	));

	logger('diaspora_followup: base message: ' . $msg, LOGGER_DATA);
	logger('send guid '.$item['guid'], LOGGER_DEBUG);

	$slap = 'xml=' . urlencode(urlencode(diaspora_msg_build($msg,$owner,$contact,$owner['uprvkey'],$contact['pubkey'],$public_batch)));
	//$slap = 'xml=' . urlencode(diaspora_msg_build($msg,$owner,$contact,$owner['uprvkey'],$contact['pubkey'],$public_batch));

	return(diaspora_transmit($owner,$contact,$slap,$public_batch,false,$item['guid']));
}


function diaspora_send_relay($item,$owner,$contact,$public_batch = false) {


	$a = get_app();
	$myaddr = $owner['nickname'] . '@' . substr($a->get_baseurl(), strpos($a->get_baseurl(),'://') + 3);
//	$theiraddr = $contact['addr'];

	// Diaspora doesn't support threaded comments, but some
	// versions of Diaspora (i.e. Diaspora-pistos) support
	// likes on comments
	if($item['verb'] === ACTIVITY_LIKE && $item['thr-parent']) {
		$p = q("select guid, type, uri, `parent-uri` from item where uri = '%s' limit 1",
			dbesc($item['thr-parent'])
		      );
	}
	else {
		// The first item in the `item` table with the parent id is the parent. However, MySQL doesn't always
		// return the items ordered by `item`.`id`, in which case the wrong item is chosen as the parent.
		// The only item with `parent` and `id` as the parent id is the parent item.
		$p = q("select guid, type, uri, `parent-uri` from item where parent = %d and id = %d limit 1",
		       intval($item['parent']),
		       intval($item['parent'])
		      );
	}
	if(count($p))
		$parent = $p[0];
	else
		return;

	$like = false;
	$relay_retract = false;
	$sql_sign_id = 'iid';
	if( $item['deleted']) {
		$relay_retract = true;

		$target_type = ( ($item['verb'] === ACTIVITY_LIKE) ? 'Like' : 'Comment');

		$sql_sign_id = 'retract_iid';
		$tpl = get_markup_template('diaspora_relayable_retraction.tpl');
	}
	elseif($item['verb'] === ACTIVITY_LIKE) {
		$like = true;

		$target_type = ( $parent['uri'] === $parent['parent-uri']  ? 'Post' : 'Comment');
//		$positive = (($item['deleted']) ? 'false' : 'true');
		$positive = 'true';

		$tpl = get_markup_template('diaspora_like_relay.tpl');
	}
	else { // item is a comment
		$tpl = get_markup_template('diaspora_comment_relay.tpl');
	}


	// fetch the original signature	if the relayable was created by a Diaspora
	// or DFRN user. Relayables for other networks are not supported.

	$r = q("SELECT `signed_text`, `signature`, `signer` FROM `sign` WHERE " . $sql_sign_id . " = %d LIMIT 1",
		intval($item['id'])
	);
	if(count($r)) {
		$orig_sign = $r[0];
		$signed_text = $orig_sign['signed_text'];
		$authorsig = $orig_sign['signature'];
		$handle = $orig_sign['signer'];

		// Split the signed text
		$signed_parts = explode(";", $signed_text);

		// Remove the parent guid
		array_shift($signed_parts);

		// Remove the comment guid
		array_shift($signed_parts);

		// Remove the handle
		array_pop($signed_parts);

		// Glue the parts together
		$text = implode(";", $signed_parts);
	}
	else {
		// This part is meant for cases where we don't have the signatur. (Which shouldn't happen with posts from Diaspora and Friendica)
		// This means that the comment won't be accepted by newer Diaspora servers

		$body = $item['body'];
		$text = html_entity_decode(bb2diaspora($body));

		$handle = diaspora_handle_from_contact($item['contact-id']);
		if(! $handle)
			return;

		if($relay_retract)
			$signed_text = $item['guid'] . ';' . $target_type;
		elseif($like)
			$signed_text = $item['guid'] . ';' . $target_type . ';' . $parent['guid'] . ';' . $positive . ';' . $handle;
		else
			$signed_text = $item['guid'] . ';' . $parent['guid'] . ';' . $text . ';' . $handle;

		$authorsig = base64_encode(rsa_sign($signed_text,$owner['uprvkey'],'sha256'));
	}

	// Sign the relayable with the top-level owner's signature
	$parentauthorsig = base64_encode(rsa_sign($signed_text,$owner['uprvkey'],'sha256'));

	$msg = replace_macros($tpl,array(
		'$guid' => xmlify($item['guid']),
		'$parent_guid' => xmlify($parent['guid']),
		'$target_type' =>xmlify($target_type),
		'$authorsig' => xmlify($authorsig),
		'$parentsig' => xmlify($parentauthorsig),
		'$body' => xmlify($text),
		'$positive' => xmlify($positive),
		'$handle' => xmlify($handle)
	));

	logger('diaspora_send_relay: base message: ' . $msg, LOGGER_DATA);
	logger('send guid '.$item['guid'], LOGGER_DEBUG);

	$slap = 'xml=' . urlencode(urlencode(diaspora_msg_build($msg,$owner,$contact,$owner['uprvkey'],$contact['pubkey'],$public_batch)));
	//$slap = 'xml=' . urlencode(diaspora_msg_build($msg,$owner,$contact,$owner['uprvkey'],$contact['pubkey'],$public_batch));

	return(diaspora_transmit($owner,$contact,$slap,$public_batch,false,$item['guid']));

}



function diaspora_send_retraction($item,$owner,$contact,$public_batch = false) {

	$a = get_app();
	$myaddr = $owner['nickname'] . '@' .  substr($a->get_baseurl(), strpos($a->get_baseurl(),'://') + 3);

	// Check whether the retraction is for a top-level post or whether it's a relayable
	if( $item['uri'] !== $item['parent-uri'] ) {

		$tpl = get_markup_template('diaspora_relay_retraction.tpl');
		$target_type = (($item['verb'] === ACTIVITY_LIKE) ? 'Like' : 'Comment');
	}
	else {

		$tpl = get_markup_template('diaspora_signed_retract.tpl');
		$target_type = 'StatusMessage';
	}

	$signed_text = $item['guid'] . ';' . $target_type;

	$msg = replace_macros($tpl, array(
		'$guid'   => xmlify($item['guid']),
		'$type'   => xmlify($target_type),
		'$handle' => xmlify($myaddr),
		'$signature' => xmlify(base64_encode(rsa_sign($signed_text,$owner['uprvkey'],'sha256')))
	));

	logger('send guid '.$item['guid'], LOGGER_DEBUG);

	$slap = 'xml=' . urlencode(urlencode(diaspora_msg_build($msg,$owner,$contact,$owner['uprvkey'],$contact['pubkey'],$public_batch)));
	//$slap = 'xml=' . urlencode(diaspora_msg_build($msg,$owner,$contact,$owner['uprvkey'],$contact['pubkey'],$public_batch));

	return(diaspora_transmit($owner,$contact,$slap,$public_batch,false,$item['guid']));
}

function diaspora_send_mail($item,$owner,$contact) {

	$a = get_app();
	$myaddr = $owner['nickname'] . '@' .  substr($a->get_baseurl(), strpos($a->get_baseurl(),'://') + 3);

	$r = q("select * from conv where id = %d and uid = %d limit 1",
		intval($item['convid']),
		intval($item['uid'])
	);

	if(! count($r)) {
		logger('diaspora_send_mail: conversation not found.');
		return;
	}
	$cnv = $r[0];

	$conv = array(
		'guid' => xmlify($cnv['guid']),
		'subject' => xmlify($cnv['subject']),
		'created_at' => xmlify(datetime_convert('UTC','UTC',$cnv['created'],'Y-m-d H:i:s \U\T\C')),
		'diaspora_handle' => xmlify($cnv['creator']),
		'participant_handles' => xmlify($cnv['recips'])
	);

	$body = bb2diaspora($item['body']);
	$created = datetime_convert('UTC','UTC',$item['created'],'Y-m-d H:i:s \U\T\C');

	$signed_text =  $item['guid'] . ';' . $cnv['guid'] . ';' . $body .  ';'
		. $created . ';' . $myaddr . ';' . $cnv['guid'];

	$sig = base64_encode(rsa_sign($signed_text,$owner['uprvkey'],'sha256'));

	$msg = array(
		'guid' => xmlify($item['guid']),
		'parent_guid' => xmlify($cnv['guid']),
		'parent_author_signature' => xmlify($sig),
		'author_signature' => xmlify($sig),
		'text' => xmlify($body),
		'created_at' => xmlify($created),
		'diaspora_handle' => xmlify($myaddr),
		'conversation_guid' => xmlify($cnv['guid'])
	);

	if($item['reply']) {
		$tpl = get_markup_template('diaspora_message.tpl');
		$xmsg = replace_macros($tpl, array('$msg' => $msg));
	}
	else {
		$conv['messages'] = array($msg);
		$tpl = get_markup_template('diaspora_conversation.tpl');
		$xmsg = replace_macros($tpl, array('$conv' => $conv));
	}

	logger('diaspora_conversation: ' . print_r($xmsg,true), LOGGER_DATA);
	logger('send guid '.$item['guid'], LOGGER_DEBUG);

	$slap = 'xml=' . urlencode(urlencode(diaspora_msg_build($xmsg,$owner,$contact,$owner['uprvkey'],$contact['pubkey'],false)));
	//$slap = 'xml=' . urlencode(diaspora_msg_build($xmsg,$owner,$contact,$owner['uprvkey'],$contact['pubkey'],false));

	return(diaspora_transmit($owner,$contact,$slap,false,false,$item['guid']));


}

function diaspora_transmit($owner,$contact,$slap,$public_batch,$queue_run=false,$guid = "") {

	$enabled = intval(get_config('system','diaspora_enabled'));
	if(! $enabled) {
		return 200;
	}

	$a = get_app();
	$logid = random_string(4);
	$dest_url = (($public_batch) ? $contact['batch'] : $contact['notify']);
	if(! $dest_url) {
		logger('diaspora_transmit: no url for contact: ' . $contact['id'] . ' batch mode =' . $public_batch);
		return 0;
	}

	logger('diaspora_transmit: '.$logid.'-'.$guid.' '.$dest_url);

	if( (! $queue_run) && (was_recently_delayed($contact['id'])) ) {
		$return_code = 0;
	}
	else {
		if (!intval(get_config('system','diaspora_test'))) {
			post_url($dest_url . '/', $slap);
			$return_code = $a->get_curl_code();
		} else {
			logger('diaspora_transmit: test_mode');
			return 200;
		}
	}

	logger('diaspora_transmit: '.$logid.'-'.$guid.' returns: '.$return_code);

	if((! $return_code) || (($return_code == 503) && (stristr($a->get_curl_headers(),'retry-after')))) {
		logger('diaspora_transmit: queue message');

		$r = q("SELECT id from queue where cid = %d and network = '%s' and content = '%s' and batch = %d limit 1",
			intval($contact['id']),
			dbesc(NETWORK_DIASPORA),
			dbesc($slap),
			intval($public_batch)
		);
		if(count($r)) {
			logger('diaspora_transmit: add_to_queue ignored - identical item already in queue');
		}
		else {
			// queue message for redelivery
			add_to_queue($contact['id'],NETWORK_DIASPORA,$slap,$public_batch);
		}
	}


	return(($return_code) ? $return_code : (-1));
}

function diaspora_fetch_relay() {

	$serverdata = get_config("system", "relay_server");
	if ($serverdata == "")
		return array();

	$relay = array();

	$servers = explode(",", $serverdata);

	foreach($servers AS $server) {
		$server = trim($server);
		$batch = $server."/receive/public";

		$relais = q("SELECT `batch`, `id`, `name`,`network` FROM `contact` WHERE `uid` = 0 AND `batch` = '%s' LIMIT 1", dbesc($batch));

		if (!$relais) {
			$addr = "relay@".str_replace("http://", "", normalise_link($server));

			$r = q("INSERT INTO `contact` (`uid`, `created`, `name`, `nick`, `addr`, `url`, `nurl`, `batch`, `network`, `rel`, `blocked`, `pending`, `writable`, `name-date`, `uri-date`, `avatar-date`)
				VALUES (0, '%s', '%s', 'relay', '%s', '%s', '%s', '%s', '%s', %d, 0, 0, 1, '%s', '%s', '%s')",
				datetime_convert(),
				dbesc($addr),
				dbesc($addr),
				dbesc($server),
				dbesc(normalise_link($server)),
				dbesc($batch),
				dbesc(NETWORK_DIASPORA),
				intval(CONTACT_IS_FOLLOWER),
				dbesc(datetime_convert()),
				dbesc(datetime_convert()),
				dbesc(datetime_convert())
			);

			$relais = q("SELECT `batch`, `id`, `name`,`network` FROM `contact` WHERE `uid` = 0 AND `batch` = '%s' LIMIT 1", dbesc($batch));
			if ($relais)
				$relay[] = $relais[0];
		} else
			$relay[] = $relais[0];
	}

	return $relay;
}