Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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<?php
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/**
* @file mod/dfrn_request.php
* @brief Module: dfrn_request
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*
* Purpose: Handles communication associated with the issuance of
* friend requests.
*
* @see PDF with dfrn specs: https://github.com/friendica/friendica/blob/master/spec/dfrn2.pdf
* You also find a graphic which describes the confirmation process at
* https://github.com/friendica/friendica/blob/master/spec/dfrn2_contact_request.png
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*/
require_once('include/enotify.php');
require_once('include/Scrape.php');
require_once('include/Probe.php');
require_once('include/group.php');
function dfrn_request_init(App &$a) {
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if($a->argc > 1)
$which = $a->argv[1];
profile_load($a,$which);
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return;
}
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/**
* Function: dfrn_request_post
*
* Purpose:
* Handles multiple scenarios.
*
* Scenario 1:
* Clicking 'submit' on a friend request page.
*
* Scenario 2:
* Following Scenario 1, we are brought back to our home site
* in order to link our friend request with our own server cell.
* After logging in, we click 'submit' to approve the linkage.
*
*/
function dfrn_request_post(App &$a) {
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if(($a->argc != 2) || (! count($a->profile))) {
logger('Wrong count of argc or profiles: argc=' . $a->argc . ',profile()=' . count($a->profile));
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return;
}
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if(x($_POST, 'cancel')) {
goaway(z_root());
}
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/*
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*
* Scenario 2: We've introduced ourself to another cell, then have been returned to our own cell
* to confirm the request, and then we've clicked submit (perhaps after logging in).
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* That brings us here:
*
*/
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if((x($_POST,'localconfirm')) && ($_POST['localconfirm'] == 1)) {
/*
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* Ensure this is a valid request
*/
if(local_user() && ($a->user['nickname'] == $a->argv[1]) && (x($_POST,'dfrn_url'))) {
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$dfrn_url = notags(trim($_POST['dfrn_url']));
$aes_allow = (((x($_POST,'aes_allow')) && ($_POST['aes_allow'] == 1)) ? 1 : 0);
$confirm_key = ((x($_POST,'confirm_key')) ? $_POST['confirm_key'] : "");
$hidden = ((x($_POST,'hidden-contact')) ? intval($_POST['hidden-contact']) : 0);
$contact_record = null;
$blocked = 1;
$pending = 1;
if(x($dfrn_url)) {
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/*
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* Lookup the contact based on their URL (which is the only unique thing we have at the moment)
*/
$r = q("SELECT * FROM `contact` WHERE `uid` = %d AND `nurl` = '%s' AND NOT `self` LIMIT 1",
intval(local_user()),
dbesc(normalise_link($dfrn_url))
);
if (dbm::is_result($r)) {
if(strlen($r[0]['dfrn-id'])) {
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/*
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* We don't need to be here. It has already happened.
*/
notice( t("This introduction has already been accepted.") . EOL );
return;
}
else
$contact_record = $r[0];
}
if(is_array($contact_record)) {
$r = q("UPDATE `contact` SET `ret-aes` = %d, hidden = %d WHERE `id` = %d",
intval($aes_allow),
intval($hidden),
intval($contact_record['id'])
);
}
else {
/*
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* Scrape the other site's profile page to pick up the dfrn links, key, fn, and photo
*/
$parms = Probe::profile($dfrn_url);
if (! count($parms)) {
notice( t('Profile location is not valid or does not contain profile information.') . EOL );
return;
}
else {
if (! x($parms,'fn')) {
notice( t('Warning: profile location has no identifiable owner name.') . EOL );
}
if (! x($parms,'photo')) {
notice( t('Warning: profile location has no profile photo.') . EOL );
}
$invalid = Probe::valid_dfrn($parms);
if ($invalid) {
notice( sprintf( tt("%d required parameter was not found at the given location",
"%d required parameters were not found at the given location",
$invalid), $invalid) . EOL );
return;
}
}
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$dfrn_request = $parms['dfrn-request'];
$photo = $parms["photo"];
// Escape the entire array
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dbesc_array($parms);
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/*
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* Create a contact record on our site for the other person
*/
$r = q("INSERT INTO `contact` ( `uid`, `created`,`url`, `nurl`, `addr`, `name`, `nick`, `photo`, `site-pubkey`,
`request`, `confirm`, `notify`, `poll`, `poco`, `network`, `aes_allow`, `hidden`, `blocked`, `pending`)
VALUES ( %d, '%s', '%s', '%s', '%s', '%s' , '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', %d, %d, %d, %d)",
intval(local_user()),
datetime_convert(),
dbesc($dfrn_url),
dbesc(normalise_link($dfrn_url)),
$parms['addr'],
$parms['fn'],
$parms['nick'],
$parms['photo'],
$parms['key'],
$parms['dfrn-request'],
$parms['dfrn-confirm'],
$parms['dfrn-notify'],
$parms['dfrn-poll'],
$parms['dfrn-poco'],
dbesc(NETWORK_DFRN),
intval($aes_allow),
intval($hidden),
intval($blocked),
intval($pending)
);
}
if($r) {
info( t("Introduction complete.") . EOL);
}
$r = q("SELECT `id`, `network` FROM `contact` WHERE `uid` = %d AND `url` = '%s' AND `site-pubkey` = '%s' LIMIT 1",
intval(local_user()),
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dbesc($dfrn_url),
$parms['key'] // this was already escaped
);
if (dbm::is_result($r)) {
$def_gid = get_default_group(local_user(), $r[0]["network"]);
if(intval($def_gid))
group_add_member(local_user(), '', $r[0]['id'], $def_gid);
if (isset($photo))
update_contact_avatar($photo, local_user(), $r[0]["id"], true);
$forwardurl = App::get_baseurl()."/contacts/".$r[0]['id'];
} else {
$forwardurl = App::get_baseurl()."/contacts";
}
/*
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* Allow the blocked remote notification to complete
*/
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if (is_array($contact_record)) {
$dfrn_request = $contact_record['request'];
}
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if (strlen($dfrn_request) && strlen($confirm_key)) {
$s = fetch_url($dfrn_request . '?confirm_key=' . $confirm_key);
}
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// (ignore reply, nothing we can do it failed)
// Old: goaway(zrl($dfrn_url));
goaway($forwardurl);
return; // NOTREACHED
}
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}
// invalid/bogus request
notice( t('Unrecoverable protocol error.') . EOL );
goaway(z_root());
return; // NOTREACHED
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}
/*
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* Otherwise:
*
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* Scenario 1:
* We are the requestee. A person from a remote cell has made an introduction
* on our profile web page and clicked submit. We will use their DFRN-URL to
* figure out how to contact their cell.
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*
* Scrape the originating DFRN-URL for everything we need. Create a contact record
* and an introduction to show our user next time he/she logs in.
* Finally redirect back to the requestor so that their site can record the request.
* If our user (the requestee) later confirms this request, a record of it will need
* to exist on the requestor's cell in order for the confirmation process to complete..
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*
* It's possible that neither the requestor or the requestee are logged in at the moment,
* and the requestor does not yet have any credentials to the requestee profile.
*
* Who is the requestee? We've already loaded their profile which means their nickname should be
* in $a->argv[1] and we should have their complete info in $a->profile.
*
*/
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if(! (is_array($a->profile) && count($a->profile))) {
notice( t('Profile unavailable.') . EOL);
return;
}
$nickname = $a->profile['nickname'];
$notify_flags = $a->profile['notify-flags'];
$uid = $a->profile['uid'];
$maxreq = intval($a->profile['maxreq']);
$contact_record = null;
$failed = false;
$parms = null;
$blocked = 1;
$pending = 1;
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if( x($_POST,'dfrn_url')) {
/*
* Block friend request spam
*/
if($maxreq) {
$r = q("SELECT * FROM `intro` WHERE `datetime` > '%s' AND `uid` = %d",
dbesc(datetime_convert('UTC','UTC','now - 24 hours')),
intval($uid)
);
if (dbm::is_result($r) && count($r) > $maxreq) {
notice( sprintf( t('%s has received too many connection requests today.'), $a->profile['name']) . EOL);
notice( t('Spam protection measures have been invoked.') . EOL);
notice( t('Friends are advised to please try again in 24 hours.') . EOL);
return;
}
}
/*
*
* Cleanup old introductions that remain blocked.
* Also remove the contact record, but only if there is no existing relationship
* Do not remove email contacts as these may be awaiting email verification
*/
$r = q("SELECT `intro`.*, `intro`.`id` AS `iid`, `contact`.`id` AS `cid`, `contact`.`rel`
FROM `intro` LEFT JOIN `contact` on `intro`.`contact-id` = `contact`.`id`
WHERE `intro`.`blocked` = 1 AND `contact`.`self` = 0
AND `contact`.`network` != '%s'
AND `intro`.`datetime` < UTC_TIMESTAMP() - INTERVAL 30 MINUTE ",
dbesc(NETWORK_MAIL2)
);
if (dbm::is_result($r)) {
foreach($r as $rr) {
if(! $rr['rel']) {
q("DELETE FROM `contact` WHERE `id` = %d",
intval($rr['cid'])
);
}
q("DELETE FROM `intro` WHERE `id` = %d",
intval($rr['iid'])
);
}
}
/*
*
* Cleanup any old email intros - which will have a greater lifetime
*/
$r = q("SELECT `intro`.*, `intro`.`id` AS `iid`, `contact`.`id` AS `cid`, `contact`.`rel`
FROM `intro` LEFT JOIN `contact` on `intro`.`contact-id` = `contact`.`id`
WHERE `intro`.`blocked` = 1 AND `contact`.`self` = 0
AND `contact`.`network` = '%s'
AND `intro`.`datetime` < UTC_TIMESTAMP() - INTERVAL 3 DAY ",
dbesc(NETWORK_MAIL2)
);
if (dbm::is_result($r)) {
foreach($r as $rr) {
if(! $rr['rel']) {
q("DELETE FROM `contact` WHERE `id` = %d",
intval($rr['cid'])
);
}
q("DELETE FROM `intro` WHERE `id` = %d",
intval($rr['iid'])
);
}
}
$email_follow = (x($_POST,'email_follow') ? intval($_POST['email_follow']) : 0);
$real_name = (x($_POST,'realname') ? notags(trim($_POST['realname'])) : '');
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$url = trim($_POST['dfrn_url']);
if(! strlen($url)) {
notice( t("Invalid locator") . EOL );
return;
}
$hcard = '';
if($email_follow) {
if(! validate_email($url)) {
notice( t('Invalid email address.') . EOL);
return;
}
$addr = $url;
$name = ($realname) ? $realname : $addr;
$nick = substr($addr,0,strpos($addr,'@'));
$url = 'http://' . substr($addr,strpos($addr,'@') + 1);
$nurl = normalise_url($host);
$poll = 'email ' . random_string();
$notify = 'smtp ' . random_string();
$network = NETWORK_MAIL2;
$rel = CONTACT_IS_FOLLOWER;
$mail_disabled = ((function_exists('imap_open') && (! get_config('system','imap_disabled'))) ? 0 : 1);
if(get_config('system','dfrn_only'))
$mail_disabled = 1;
if(! $mail_disabled) {
$failed = false;
$r = q("SELECT * FROM `mailacct` WHERE `uid` = %d LIMIT 1",
intval($uid)
);
if (! dbm::is_result($r)) {
notice( t('This account has not been configured for email. Request failed.') . EOL);
return;
}
}
$r = q("insert into contact ( uid, created, addr, name, nick, url, nurl, poll, notify, blocked, pending, network, rel )
values( %d, '%s', '%s', '%s', '%s', '%s', '%s', '%s', %d, %d, '%s', %d ) ",
intval($uid),
dbesc(datetime_convert()),
dbesc($addr),
dbesc($name),
dbesc($nick),
dbesc($url),
dbesc($nurl),
dbesc($poll),
dbesc($notify),
intval($blocked),
intval($pending),
dbesc($network),
intval($rel)
);
$r = q("SELECT `id`, `network` FROM `contact` WHERE `poll` = '%s' AND `uid` = %d LIMIT 1",
dbesc($poll),
intval($uid)
);
if (dbm::is_result($r)) {
$contact_id = $r[0]['id'];
$def_gid = get_default_group($uid, $r[0]["network"]);
if (intval($def_gid))
group_add_member($uid, '', $contact_id, $def_gid);
$photo = avatar_img($addr);
$r = q("UPDATE `contact` SET
`photo` = '%s',
`thumb` = '%s',
`micro` = '%s',
`name-date` = '%s',
`uri-date` = '%s',
`avatar-date` = '%s',
`hidden` = 0,
WHERE `id` = %d
",
dbesc($photos[0]),
dbesc($photos[1]),
dbesc($photos[2]),
dbesc(datetime_convert()),
dbesc(datetime_convert()),
dbesc(datetime_convert()),
intval($contact_id)
);
}
// contact is created. Now create an introduction
$hash = random_string();
$r = q("INSERT INTO `intro` ( `uid`, `contact-id`, knowyou, note, hash, datetime, blocked )
VALUES( %d , %d, %d, '%s', '%s', '%s', %d ) ",
intval($uid),
intval($contact_id),
((x($_POST,'knowyou') && ($_POST['knowyou'] == 1)) ? 1 : 0),
dbesc(notags(trim($_POST['dfrn-request-message']))),
dbesc($hash),
dbesc(datetime_convert()),
1
);
// Next send an email verify form to the requestor.
} else {
// Detect the network
$data = probe_url($url);
$network = $data["network"];
// Canonicalise email-style profile locator
$url = Probe::webfinger_dfrn($url,$hcard);
if (substr($url,0,5) === 'stat:') {
// Every time we detect the remote subscription we define this as OStatus.
// We do this even if it is not OStatus.
// we only need to pass this through another section of the code.
if ($network != NETWORK_DIASPORA)
$network = NETWORK_OSTATUS;
$url = substr($url,5);
} else
$network = NETWORK_DFRN;
}
logger('dfrn_request: url: ' . $url . ',network=' . $network, LOGGER_DEBUG);
if($network === NETWORK_DFRN) {
$ret = q("SELECT * FROM `contact` WHERE `uid` = %d AND `url` = '%s' AND `self` = 0 LIMIT 1",
intval($uid),
dbesc($url)
);
if (dbm::is_result($ret)) {
if(strlen($ret[0]['issued-id'])) {
notice( t('You have already introduced yourself here.') . EOL );
return;
}
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elseif($ret[0]['rel'] == CONTACT_IS_FRIEND) {
notice( sprintf( t('Apparently you are already friends with %s.'), $a->profile['name']) . EOL);
return;
}
else {
$contact_record = $ret[0];
$parms = array('dfrn-request' => $ret[0]['request']);
}
}
$issued_id = random_string();
if(is_array($contact_record)) {
// There is a contact record but no issued-id, so this
// is a reciprocal introduction from a known contact
$r = q("UPDATE `contact` SET `issued-id` = '%s' WHERE `id` = %d",
dbesc($issued_id),
intval($contact_record['id'])
);
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}
else {
if (! validate_url($url)) {
notice( t('Invalid profile URL.') . EOL);
goaway(App::get_baseurl() . '/' . $a->cmd);
return; // NOTREACHED
}
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if (! allowed_url($url)) {
notice( t('Disallowed profile URL.') . EOL);
goaway(App::get_baseurl() . '/' . $a->cmd);
return; // NOTREACHED
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}
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require_once('include/Scrape.php');
$parms = Probe::profile(($hcard) ? $hcard : $url);
if (! count($parms)) {
notice( t('Profile location is not valid or does not contain profile information.') . EOL );
goaway(App::get_baseurl() . '/' . $a->cmd);
}
else {
if (! x($parms,'fn')) {
notice( t('Warning: profile location has no identifiable owner name.') . EOL );
}
if (! x($parms,'photo')) {
notice( t('Warning: profile location has no profile photo.') . EOL );
}
$invalid = Probe::valid_dfrn($parms);
if ($invalid) {
notice( sprintf( tt("%d required parameter was not found at the given location",
"%d required parameters were not found at the given location",
$invalid), $invalid) . EOL );
return;
}
}
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$parms['url'] = $url;
$parms['issued-id'] = $issued_id;
$photo = $parms["photo"];
dbesc_array($parms);
$r = q("INSERT INTO `contact` ( `uid`, `created`, `url`, `nurl`, `addr`, `name`, `nick`, `issued-id`, `photo`, `site-pubkey`,
`request`, `confirm`, `notify`, `poll`, `poco`, `network`, `blocked`, `pending` )
VALUES ( %d, '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', %d, %d )",
intval($uid),
dbesc(datetime_convert()),
$parms['url'],
dbesc(normalise_link($url)),
$parms['addr'],
$parms['fn'],
$parms['nick'],
$parms['issued-id'],
$parms['photo'],
$parms['key'],
$parms['dfrn-request'],
$parms['dfrn-confirm'],
$parms['dfrn-notify'],
$parms['dfrn-poll'],
$parms['dfrn-poco'],
dbesc(NETWORK_DFRN),
intval($blocked),
intval($pending)
);
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// find the contact record we just created
if ($r) {
$r = q("SELECT `id` FROM `contact`
WHERE `uid` = %d AND `url` = '%s' AND `issued-id` = '%s' LIMIT 1",
intval($uid),
$parms['url'],
$parms['issued-id']
);
if (dbm::is_result($r)) {
$contact_record = $r[0];
update_contact_avatar($photo, $uid, $contact_record["id"], true);
}
}
}
if ($r === false) {
notice( t('Failed to update contact record.') . EOL );
return;
}
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$hash = random_string() . (string) time(); // Generate a confirm_key
if (is_array($contact_record)) {
$ret = q("INSERT INTO `intro` ( `uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime`)
VALUES ( %d, %d, 1, %d, '%s', '%s', '%s' )",
intval($uid),
intval($contact_record['id']),
((x($_POST,'knowyou') && ($_POST['knowyou'] == 1)) ? 1 : 0),
dbesc(notags(trim($_POST['dfrn-request-message']))),
dbesc($hash),
dbesc(datetime_convert())
);
}
// This notice will only be seen by the requestor if the requestor and requestee are on the same server.
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if (! $failed) {
info( t('Your introduction has been sent.') . EOL );
}
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// "Homecoming" - send the requestor back to their site to record the introduction.
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$dfrn_url = bin2hex(App::get_baseurl() . '/profile/' . $nickname);
$aes_allow = ((function_exists('openssl_encrypt')) ? 1 : 0);
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goaway($parms['dfrn-request'] . "?dfrn_url=$dfrn_url"
. '&dfrn_version=' . DFRN_PROTOCOL_VERSION
. '&confirm_key=' . $hash
. (($aes_allow) ? "&aes_allow=1" : "")
);
// NOTREACHED
// END $network === NETWORK_DFRN
} elseif (($network != NETWORK_PHANTOM) AND ($url != "")) {
/*
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*
* Substitute our user's feed URL into $url template
* Send the subscriber home to subscribe
*
*/
// Diaspora needs the uri in the format user@domain.tld
// Diaspora will support the remote subscription in a future version
if ($network == NETWORK_DIASPORA) {
$uri = $nickname.'@'.$a->get_hostname();
if ($a->get_path())
$uri .= '/'.$a->get_path();
$uri = urlencode($uri);
} else {
$uri = App::get_baseurl().'/profile/'.$nickname;
}
$url = str_replace('{uri}', $uri, $url);
goaway($url);
// NOTREACHED
// END $network != NETWORK_PHANTOM
} else {
notice(t("Remote subscription can't be done for your network. Please subscribe directly on your system.").EOL);
return;
}