friendica/mod/dfrn_request.php

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<?php
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/**
*
* Module: dfrn_request
*
* Purpose: Handles communication associated with the issuance of
* friend requests.
*
*/
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if(! function_exists('dfrn_request_init')) {
function dfrn_request_init(&$a) {
if($a->argc > 1)
$which = $a->argv[1];
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profile_load($a,$which);
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return;
}}
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/**
* Function: dfrn_request_post
*
* Purpose:
* Handles multiple scenarios.
*
* Scenario 1:
* Clicking 'submit' on a friend request page.
*
* Scenario 2:
* Following Scenario 1, we are brought back to our home site
* in order to link our friend request with our own server cell.
* After logging in, we click 'submit' to approve the linkage.
*
*/
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if(! function_exists('dfrn_request_post')) {
function dfrn_request_post(&$a) {
if(($a->argc != 2) || (! count($a->profile)))
return;
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if(x($_POST, 'cancel')) {
goaway(z_root());
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}
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/**
*
* Scenario 2: We've introduced ourself to another cell, then have been returned to our own cell
* to confirm the request, and then we've clicked submit (perhaps after logging in).
* That brings us here:
*
*/
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if((x($_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')) ? $_POST['confirm_key'] : "");
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$contact_record = null;
if(x($dfrn_url)) {
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/**
* Lookup the contact based on their URL (which is the only unique thing we have at the moment)
*/
$r = q("SELECT * FROM `contact` WHERE `uid` = %d AND `url` = '%s' AND `self` = 0 LIMIT 1",
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intval(local_user()),
dbesc($dfrn_url)
);
if(count($r)) {
if(strlen($r[0]['dfrn-id'])) {
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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)) {
$r = q("UPDATE `contact` SET `ret-aes` = %d WHERE `id` = %d LIMIT 1",
intval($aes_allow),
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
*/
require_once('Scrape.php');
$parms = scrape_dfrn($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 );
$invalid = validate_dfrn($parms);
if($invalid) {
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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 = $parms['dfrn-request'];
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/********* Escape the entire array ********/
dbesc_array($parms);
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/******************************************/
/**
* Create a contact record on our site for the other person
*/
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$r = q("INSERT INTO `contact` ( `uid`, `created`,`url`, `nurl`, `name`, `nick`, `photo`, `site-pubkey`,
`request`, `confirm`, `notify`, `poll`, `poco`, `network`, `aes_allow`)
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VALUES ( %d, '%s', '%s', '%s', '%s' , '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', %d)",
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intval(local_user()),
datetime_convert(),
dbesc($dfrn_url),
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dbesc(normalise_link($dfrn_url)),
$parms['fn'],
$parms['nick'],
$parms['photo'],
$parms['key'],
$parms['dfrn-request'],
$parms['dfrn-confirm'],
$parms['dfrn-notify'],
$parms['dfrn-poll'],
$parms['dfrn-poco'],
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dbesc(NETWORK_DFRN),
intval($aes_allow)
);
}
if($r) {
info( t("Introduction complete.") . EOL);
}
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/**
* Allow the blocked remote notification to complete
*/
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if(is_array($contact_record))
$dfrn_request = $contact_record['request'];
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if(strlen($dfrn_request) && strlen($confirm_key))
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$s = fetch_url($dfrn_request . '?confirm_key=' . $confirm_key);
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// (ignore reply, nothing we can do it failed)
goaway($dfrn_url);
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:
*
* 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.
*
* 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..
*
* 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($a->profile))) {
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notice( t('Profile unavailable.') . EOL);
return;
}
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$nickname = $a->profile['nickname'];
$notify_flags = $a->profile['notify-flags'];
$uid = $a->profile['uid'];
$maxreq = intval($a->profile['maxreq']);
$contact_record = null;
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$failed = false;
$parms = null;
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if( x($_POST,'dfrn_url')) {
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/**
* 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(count($r) > $maxreq) {
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notice( sprintf( t('%s has received too many connection requests today.'), $a->profile['name']) . EOL);
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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
*/
$r = q("SELECT `intro`.*, `intro`.`id` AS `iid`, `contact`.`id` AS `cid`, `contact`.`rel`
FROM `intro` LEFT JOIN `contact` on `intro`.`contact-id` = `contact`.`id`
WHERE `intro`.`blocked` = 1 AND `contact`.`self` = 0
AND `contact`.`network` != '%s'
AND `intro`.`datetime` < UTC_TIMESTAMP() - INTERVAL 30 MINUTE ",
dbesc(NETWORK_MAIL)
);
if(count($r)) {
foreach($r as $rr) {
if(! $rr['rel']) {
q("DELETE FROM `contact` WHERE `id` = %d LIMIT 1",
intval($rr['cid'])
);
}
q("DELETE FROM `intro` WHERE `id` = %d LIMIT 1",
intval($rr['iid'])
);
}
}
/**
*
* Cleanup any old email intros - which will have a greater lifetime
*/
$r = q("SELECT `intro`.*, `intro`.`id` AS `iid`, `contact`.`id` AS `cid`, `contact`.`rel`
FROM `intro` LEFT JOIN `contact` on `intro`.`contact-id` = `contact`.`id`
WHERE `intro`.`blocked` = 1 AND `contact`.`self` = 0
AND `contact`.`network` = '%s'
AND `intro`.`datetime` < UTC_TIMESTAMP() - INTERVAL 3 DAY ",
dbesc(NETWORK_MAIL)
);
if(count($r)) {
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foreach($r as $rr) {
if(! $rr['rel']) {
q("DELETE FROM `contact` WHERE `id` = %d LIMIT 1",
intval($rr['cid'])
);
}
q("DELETE FROM `intro` WHERE `id` = %d LIMIT 1",
intval($rr['iid'])
);
}
}
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$url = trim($_POST['dfrn_url']);
if(! strlen($url)) {
notice( t("Invalid locator") . EOL );
return;
}
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// Canonicalise email-style profile locator
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$hcard = '';
$url = webfinger_dfrn($url,$hcard);
if(substr($url,0,5) === 'stat:') {
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$network = NETWORK_OSTATUS;
$url = substr($url,5);
}
else {
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$network = NETWORK_DFRN;
}
logger('dfrn_request: url: ' . $url);
if(! strlen($url)) {
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notice( t("Unable to resolve your name at the provided location.") . EOL);
return;
}
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if($network === NETWORK_DFRN) {
$ret = q("SELECT * FROM `contact` WHERE `uid` = %d AND `url` = '%s' AND `self` = 0 LIMIT 1",
intval($uid),
dbesc($url)
);
if(count($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) {
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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
$r = q("UPDATE `contact` SET `issued-id` = '%s' WHERE `id` = %d LIMIT 1",
dbesc($issued_id),
intval($contact_record['id'])
);
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}
else {
if(! validate_url($url)) {
notice( t('Invalid profile URL.') . EOL);
goaway($a->get_baseurl() . '/' . $a->cmd);
return; // NOTREACHED
}
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if(! allowed_url($url)) {
notice( t('Disallowed profile URL.') . EOL);
goaway($a->get_baseurl() . '/' . $a->cmd);
return; // NOTREACHED
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}
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require_once('Scrape.php');
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$parms = scrape_dfrn(($hcard) ? $hcard : $url);
if(! count($parms)) {
notice( t('Profile location is not valid or does not contain profile information.') . EOL );
goaway($a->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 );
$invalid = validate_dfrn($parms);
if($invalid) {
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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'] = $issued_id;
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dbesc_array($parms);
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$r = q("INSERT INTO `contact` ( `uid`, `created`, `url`, `nurl`,`name`, `nick`, `issued-id`, `photo`, `site-pubkey`,
`request`, `confirm`, `notify`, `poll`, `poco`, `network` )
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VALUES ( %d, '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s' )",
intval($uid),
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dbesc(datetime_convert()),
$parms['url'],
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dbesc(normalise_link($parms['url'])),
$parms['fn'],
$parms['nick'],
$parms['issued-id'],
$parms['photo'],
$parms['key'],
$parms['dfrn-request'],
$parms['dfrn-confirm'],
$parms['dfrn-notify'],
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$parms['dfrn-poll'],
$parms['dfrn-poco'],
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dbesc(NETWORK_DFRN)
);
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// find the contact record we just created
if($r) {
$r = q("SELECT `id` FROM `contact`
WHERE `uid` = %d AND `url` = '%s' AND `issued-id` = '%s' LIMIT 1",
intval($uid),
$parms['url'],
$parms['issued-id']
);
if(count($r))
$contact_record = $r[0];
}
}
if($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())
);
}
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// 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($a->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
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// END $network === NETWORK_DFRN
}
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elseif($network === NETWORK_OSTATUS) {
/**
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*
* OStatus network
* Check contact existence
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* Try and scrape together enough information to create a contact record,
* with us as CONTACT_IS_FOLLOWER
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* Substitute our user's feed URL into $url template
* Send the subscriber home to subscribe
*
*/
$url = str_replace('{uri}', $a->get_baseurl() . '/dfrn_poll/' . $nickname, $url);
goaway($url);
// NOTREACHED
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// END $network === NETWORK_OSTATUS
}
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} return;
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}}
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if(! function_exists('dfrn_request_content')) {
function dfrn_request_content(&$a) {
if(($a->argc != 2) || (! count($a->profile)))
return "";
// "Homecoming". Make sure we're logged in to this site as the correct user. Then offer a confirm button
// to send us to the post section to record the introduction.
if(x($_GET,'dfrn_url')) {
if(! local_user()) {
info( t("Please login to confirm introduction.") . EOL );
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/* setup the return URL to come back to this page if they use openid */
$stripped = str_replace('q=','',$a->query_string);
$_SESSION['return_url'] = trim($stripped,'/');
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return login();
}
// Edge case, but can easily happen in the wild. This person is authenticated,
// but not as the person who needs to deal with this request.
if ($a->user['nickname'] != $a->argv[1]) {
notice( t("Incorrect identity currently logged in. Please login to <strong>this</strong> profile.") . EOL);
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return login();
}
$dfrn_url = notags(trim(hex2bin($_GET['dfrn_url'])));
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$aes_allow = (((x($_GET,'aes_allow')) && ($_GET['aes_allow'] == 1)) ? 1 : 0);
$confirm_key = (x($_GET,'confirm_key') ? $_GET['confirm_key'] : "");
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$tpl = get_markup_template("dfrn_req_confirm.tpl");
$o = replace_macros($tpl,array(
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'$dfrn_url' => $dfrn_url,
'$aes_allow' => (($aes_allow) ? '<input type="hidden" name="aes_allow" value="1" />' : "" ),
'$confirm_key' => $confirm_key,
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'$welcome' => sprintf( t('Welcome home %s.'), $a->user['username']),
'$please' => sprintf( t('Please confirm your introduction/connection request to %s.'), $dfrn_url),
'$submit' => t('Confirm'),
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'$uid' => $_SESSION['uid'],
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'$nickname' => $a->user['nickname'],
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'dfrn_rawurl' => $_GET['dfrn_url']
));
return $o;
}
elseif((x($_GET,'confirm_key')) && strlen($_GET['confirm_key'])) {
// we are the requestee and it is now safe to send our user their introduction,
// We could just unblock it, but first we have to jump through a few hoops to
// send an email, or even to find out if we need to send an email.
$intro = q("SELECT * FROM `intro` WHERE `hash` = '%s' LIMIT 1",
dbesc($_GET['confirm_key'])
);
if(count($intro)) {
$r = q("SELECT `contact`.*, `user`.* FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
WHERE `contact`.`id` = %d LIMIT 1",
intval($intro[0]['contact-id'])
);
$auto_confirm = false;
if(count($r)) {
if($r[0]['page-flags'] != PAGE_NORMAL)
$auto_confirm = true;
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if(! $auto_confirm) {
require_once('include/enotify.php');
notification(array(
'type' => NOTIFY_INTRO,
'notify_flags' => $r[0]['notify-flags'],
'language' => $r[0]['language'],
'to_name' => $r[0]['username'],
'to_email' => $r[0]['email'],
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'uid' => $r[0]['uid'],
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'link' => $a->get_baseurl() . '/notifications/intros',
'source_name' => ((strlen(stripslashes($r[0]['name']))) ? stripslashes($r[0]['name']) : t('[Name Withheld]')),
'source_link' => $r[0]['url'],
'source_photo' => $r[0]['photo'],
'verb' => ACTIVITY_REQ_FRIEND,
'otype' => 'intro'
));
}
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if($auto_confirm) {
require_once('mod/dfrn_confirm.php');
$handsfree = array(
'uid' => $r[0]['uid'],
'node' => $r[0]['nickname'],
'dfrn_id' => $r[0]['issued-id'],
'intro_id' => $intro[0]['id'],
'duplex' => (($r[0]['page-flags'] == PAGE_FREELOVE) ? 1 : 0)
);
dfrn_confirm_post($a,$handsfree);
}
}
if(! $auto_confirm) {
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// If we are auto_confirming, this record will have already been nuked
// in dfrn_confirm_post()
$r = q("UPDATE `intro` SET `blocked` = 0 WHERE `hash` = '%s' LIMIT 1",
dbesc($_GET['confirm_key'])
);
}
}
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killme();
return; // NOTREACHED
}
else {
/**
* Normal web request. Display our user's introduction form.
*/
if((get_config('system','block_public')) && (! local_user()) && (! remote_user())) {
notice( t('Public access denied.') . EOL);
return;
}
/**
* Try to auto-fill the profile address
*/
if(local_user()) {
if(strlen($a->path)) {
$myaddr = $a->get_baseurl() . '/profile/' . $a->user['nickname'];
}
else {
$myaddr = $a->user['nickname'] . '@' . substr(z_root(), strpos(z_root(),'://') + 3 );
}
}
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elseif(x($_GET,'addr')) {
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$myaddr = hex2bin($_GET['addr']);
}
else {
/* $_GET variables are already urldecoded */
$myaddr = ((x($_GET,'address')) ? $_GET['address'] : '');
}
$target_addr = $a->profile['nickname'] . '@' . substr(z_root(), strpos(z_root(),'://') + 3 );
/**
*
* The auto_request form only has the profile address
* because nobody is going to read the comments and
* it doesn't matter if they know you or not.
*
*/
if($a->profile['page-flags'] == PAGE_NORMAL)
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$tpl = get_markup_template('dfrn_request.tpl');
else
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$tpl = get_markup_template('auto_request.tpl');
$page_desc = sprintf( t('Diaspora members: Please do not use this form. Instead, enter "%s" into your Diaspora search bar.'),
$target_addr) . EOL . EOL;
$page_desc .= t("Please enter your 'Identity Address' from one of the following supported social networks:");
$o .= replace_macros($tpl,array(
'$header' => t('Friend/Connection Request'),
'$desc' => t('Examples: jojo@demo.friendica.com, http://demo.friendica.com/profile/jojo, testuser@identi.ca'),
'$pls_answer' => t('Please answer the following:'),
'$does_know' => sprintf( t('Does %s know you?'),$a->profile['name']),
'$yes' => t('Yes'),
'$no' => t('No'),
'$add_note' => t('Add a personal note:'),
'$page_desc' => $page_desc,
'$friendica' => t('Friendica'),
'$statusnet' => t('StatusNet/Federated Social Web'),
'$diaspora' => t('Diaspora'),
'$diasnote' => t('- please share from your own site as noted above'),
'$your_address' => t('Your Identity Address:'),
'$submit' => t('Submit Request'),
'$cancel' => t('Cancel'),
'$nickname' => $a->argv[1],
'$name' => $a->profile['name'],
'$myaddr' => $myaddr
));
return $o;
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}
return; // Somebody is fishing.
}}