<?php


function dfrn_confirm_post(&$a) {

	if($a->argc > 1)
		$node = $a->argv[1];

	if(x($_POST,'source_url')) {

		// We are processing an external confirmation to an introduction created by our user.

		$public_key = $_POST['public_key'];
		$dfrn_id    = $_POST['dfrn_id'];
		$source_url = $_POST['source_url'];
		$aes_key    = $_POST['aes_key'];
		$duplex     = $_POST['duplex'];
		$version_id = $_POST['dfrn_version'];


		// Find our user's account

		$r = q("SELECT * FROM `user` WHERE `nickname` = '%s' LIMIT 1",
			dbesc($node));

		if(! count($r)) {
			xml_status(3); // failure
			// NOTREACHED
		}

		$my_prvkey = $r[0]['prvkey'];
		$local_uid = $r[0]['uid'];

		// verify everything

		$decrypted_source_url = "";
		openssl_private_decrypt($source_url,$decrypted_source_url,$my_prvkey);


		$ret = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
			dbesc($decrypted_source_url),
			intval($local_uid));

		if(! count($ret)) {
			// this is either a bogus confirmation or we deleted the original introduction.
			xml_status(3);
			return; // NOTREACHED 
		}

		$relation = $ret[0]['rel'];

		// Decrypt all this stuff we just received

		$foreign_pubkey = $ret[0]['site-pubkey'];
		$dfrn_record    = $ret[0]['id'];

		$decrypted_dfrn_id = "";
		openssl_public_decrypt($dfrn_id,$decrypted_dfrn_id,$foreign_pubkey);

		if(strlen($aes_key)) {
			$decrypted_aes_key = "";
			openssl_private_decrypt($aes_key,$decrypted_aes_key,$my_prvkey);
			$dfrn_pubkey = openssl_decrypt($public_key,'AES-256-CBC',$decrypted_aes_key);
		}
		else {
			$dfrn_pubkey = $public_key;
		}

		$r = q("SELECT * FROM `contact` WHERE `dfrn-id` = '%s' LIMIT 1",
			dbesc($decrypted_dfrn_id),
			intval($local_uid)
		);
		if(count($r)) {
			xml_status(1); // Birthday paradox - duplicate dfrn-id
			// NOTREACHED
		}

		$r = q("UPDATE `contact` SET `dfrn-id` = '%s', `pubkey` = '%s' WHERE `id` = %d LIMIT 1",
			dbesc($decrypted_dfrn_id),
			dbesc($dfrn_pubkey),
			intval($dfrn_record)
		);
		if($r) {

			// We're good but now we have to scrape the profile photo and send notifications.

			require_once("Photo.php");

			$photo_failure = false;

			$r = q("SELECT `photo` FROM `contact` WHERE `id` = %d LIMIT 1",
				intval($dfrn_record));
			if(count($r)) {

				$filename = basename($r[0]['photo']);
				$img_str = fetch_url($r[0]['photo'],true);
				$img = new Photo($img_str);
				if($img->is_valid()) {

					$img->scaleImageSquare(175);
					
					$hash = photo_new_resource();

					$r = $img->store($local_uid, $dfrn_record, $hash, $filename, t('Contact Photos') , 4);

					if($r === false)
						$photo_failure = true;
					
					$img->scaleImage(80);
					$r = $img->store($local_uid, $dfrn_record, $hash, $filename, t('Contact Photos') , 5);

					if($r === false)
						$photo_failure = true;

					$photo = $a->get_baseurl() . '/photo/' . $hash . '-4.jpg';
					$thumb = $a->get_baseurl() . '/photo/' . $hash . '-5.jpg';	
				}
				else
					$photo_failure = true;
			}
			else
				$photo_failure = true;

			if($photo_failure) {
				$photo = $a->get_baseurl() . '/images/default-profile.jpg';
				$thumb = $a->get_baseurl() . '/images/default-profile-sm.jpg';
			}

			$new_relation = REL_FAN;
			if(($relation == REL_VIP) || ($duplex))
				$new_relation = REL_BUD;

			$r = q("UPDATE `contact` SET 
				`photo` = '%s', 
				`thumb` = '%s', 
				`rel` = %d, 
				`name-date` = '%s', 
				`uri-date` = '%s', 
				`avatar-date` = '%s', 
				`blocked` = 0, 
				`pending` = 0,
				`duplex` = %d, 
				`network` = 'dfrn' WHERE `id` = %d LIMIT 1
			",
				dbesc($photo),
				dbesc($thumb),
				intval($new_relation),
				dbesc(datetime_convert()),
				dbesc(datetime_convert()),
				dbesc(datetime_convert()),
				intval($duplex),
				intval($dfrn_record)
			);
			if($r === false)
				notice( t("Unable to set contact photo info.") . EOL);

			// Otherwise everything seems to have worked and we are almost done. Yay!
			// Send an email notification

			$r = q("SELECT * FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
				WHERE `contact`.`id` = %d LIMIT 1",
				intval($dfrn_record)
			);
			if((count($r)) && ($r[0]['notify-flags'] & NOTIFY_CONFIRM)) {

				$tpl = (($new_relation == REL_BUD) 
					? load_view_file('view/friend_complete_eml.tpl')
					: load_view_file('view/intro_complete_eml.tpl'));
			
				$email_tpl = replace_macros($tpl, array(
					'$sitename' => $a->config['sitename'],
					'$siteurl' =>  $a->get_baseurl(),
					'$username' => $r[0]['username'],
					'$email' => $r[0]['email'],
					'$fn' => $r[0]['name'],
					'$dfrn_url' => $r[0]['url'],
					'$uid' => $newuid )
				);
	
				$res = mail($r[0]['email'], t("Connection accepted at ") . $a->config['sitename'],
					$email_tpl, 'From: ' . t('Administrator') . '@' . $_SERVER[SERVER_NAME] );
				if(!$res) {
					notice( t("Email notification failed.") . EOL );
				}
			}
			xml_status(0); // Success
			// NOTREACHED
		}
		else {
			xml_status(2);	// Hopefully temporary problem that can be retried.
		}
		return; // NOTREACHED

	////////////////////// End of this scenario ///////////////////////////////////////////////
	}
	else {

		// We are processing a local confirmation initiated on this system by our user to an external introduction.

		$uid = get_uid();

		if(! $uid) {
			notice( t('Permission denied.') . EOL );
			return;
		}	
	
		$dfrn_id  = ((x($_POST,'dfrn_id')) ? notags(trim($_POST['dfrn_id'])) : "");
		$intro_id = intval($_POST['intro_id']);
		$duplex   = intval($_POST['duplex']);

		$r = q("SELECT * FROM `contact` WHERE `issued-id` = '%s' AND `uid` = %d LIMIT 1",
				dbesc($dfrn_id),
				intval($uid)
				);

		if(! count($r)) {
			notice( t('Node does not exist.') . EOL );
			return;
		}

		$contact_id   = $r[0]['id'];
		$relation     = $r[0]['rel'];
		$site_pubkey  = $r[0]['site-pubkey'];
		$dfrn_confirm = $r[0]['confirm'];
		$aes_allow    = $r[0]['aes_allow'];

		$res = openssl_pkey_new(array(
        		'digest_alg' => 'whirlpool',
        		'private_key_bits' => 4096,
			'encrypt_key' => false )
		);


		$private_key = '';

		openssl_pkey_export($res, $private_key);

		$pubkey = openssl_pkey_get_details($res);
		$public_key = $pubkey["key"];

		$r = q("UPDATE `contact` SET `prvkey` = '%s' WHERE `id` = %d AND `uid` = %d LIMIT 1",
			dbesc($private_key),
			intval($contact_id),
			intval($uid) 
		);


		$params = array();

		$src_aes_key = random_string();

		$result = '';
		openssl_private_encrypt($dfrn_id,$result,$a->user['prvkey']);

		$params['dfrn_id'] = $result;
		$params['public_key'] = $public_key;


		openssl_public_encrypt($_SESSION['my_url'], $params['source_url'], $site_pubkey);

		if($aes_allow && function_exists('openssl_encrypt')) {
			openssl_public_encrypt($src_aes_key, $params['aes_key'], $site_pubkey);
			$params['public_key'] = openssl_encrypt($public_key,'AES-256-CBC',$src_aes_key);
		}

		$params['dfrn_version'] = '2.0';
		if($duplex == 1)
			$params['duplex'] = 1;

		$res = post_url($dfrn_confirm,$params);

		// Try to be robust if the remote site is having difficulty and throwing up
		// errors of some kind. 

		$leading_junk = substr($res,0,strpos($res,'<?xml'));

		$res = substr($res,strpos($res,'<?xml'));
		if(! strlen($res)) {

				// No XML at all, this exchange is messed up really bad.
				// We shouldn't proceed, because the xml parser might choke,
				// and $status is going to be zero, which indicates success.
				// We can hardly call this a success.  

			notice( t('Response from remote site was not understood.') . EOL);
			return;
		}

		if(strlen($leading_junk) && get_config('system','debugging')) {

				// This might be more common. Mixed error text and some XML.
				// If we're configured for debugging, show the text. Proceed in either case.

			notice( t('Unexpected response from remote site: ') . EOL . $leading_junk . EOL );
		}

		$xml = simplexml_load_string($res);
		$status = (int) $xml->status;
		switch($status) {
			case 0:
				notice( t("Confirmation completed successfully") . EOL);
				break;
			case 1:
				// birthday paradox - generate new dfrn-id and fall through.
				$new_dfrn_id = random_string();
				$r = q("UPDATE contact SET `issued-id` = '%s' WHERE `id` = %d AND `uid` = %d LIMIT 1",
					dbesc($new_dfrn_id),
					intval($contact_id),
					intval($uid) 
				);

			case 2:
				notice( t("Temporary failure. Please wait and try again.") . EOL);
				break;


			case 3:
				notice( t("Introduction failed or was revoked. Cannot complete.") . EOL);
				break;
			}

		if(($status == 0 || $status == 3) && ($intro_id)) {

			//delete the notification

			$r = q("DELETE FROM `intro` WHERE `id` = %d AND `uid` = %d LIMIT 1",
				intval($intro_id),
				intval($uid)
			);
			
		}

		if($status != 0) 
			return;
		

		require_once("Photo.php");

		$photo_failure = false;

		$r = q("SELECT `photo` FROM `contact` WHERE `id` = %d LIMIT 1",
			intval($contact_id));
		if(count($r)) {

			$filename = basename($r[0]['photo']);
			$img_str = fetch_url($r[0]['photo'],true);
			$img = new Photo($img_str);
			if($img->is_valid()) {

				$img->scaleImageSquare(175);
					
				$hash = photo_new_resource();

				$r = $img->store($uid, $contact_id, $hash, $filename, t('Contact Photos'), 4 );

				if($r === false)
					$photo_failure = true;

				$img->scaleImage(80);

				$r = $img->store($uid, $contact_id, $hash, $filename, t('Contact Photos'), 5 );

				if($r === false)
					$photo_failure = true;

				$photo = $a->get_baseurl() . '/photo/' . $hash . '-4.jpg';
				$thumb = $a->get_baseurl() . '/photo/' . $hash . '-5.jpg';
			}
			else
				$photo_failure = true;
		}
		else
			$photo_failure = true;

		if($photo_failure) {
			$photo = $a->get_baseurl() . '/images/default-profile.jpg';
			$thumb = $a->get_baseurl() . '/images/default-profile-sm.jpg';
		}

		$new_relation = REL_VIP;
		if(($relation == REL_FAN) || ($duplex))
			$new_relation = REL_BUD;

		$r = q("UPDATE `contact` SET `photo` = '%s', 
			`thumb` = '%s', 
			`rel` = %d, 
			`name-date` = '%s', 
			`uri-date` = '%s', 
			`avatar-date` = '%s', 
			`blocked` = 0, 
			`pending` = 0,
			`duplex` = %d,
			`network` = 'dfrn' WHERE `id` = %d LIMIT 1
		",
			dbesc($photo),
			dbesc($thumb),
			intval($new_relation),
			dbesc(datetime_convert()),
			dbesc(datetime_convert()),
			dbesc(datetime_convert()),
			intval($duplex),
			intval($contact_id)
		);
		if($r === false)
			notice( t('Unable to set contact photo.') . EOL);

		goaway($a->get_baseurl() . '/contacts/' . intval($contact_id));
		return;  //NOTREACHED
	}
	return;
}