<?php
/**
*
* Module: dfrn_request
*
* Purpose: Handles communication associated with the issuance of
* friend requests.
*
*/
if(! function_exists('dfrn_request_init')) {
function dfrn_request_init(&$a) {
if($a->argc > 1)
$which = $a->argv[1];
profile_load($a,$which);
return;
}}
/**
* Function: dfrn_request_post
*
* Purpose:
* Handles multiple scenarios.
*
* Scenario 1:
* Clicking 'submit' on a friend request page.
*
* Scenario 2:
* Following Scenario 1, we are brought back to our home site
* in order to link our friend request with our own server cell.
* After logging in, we click 'submit' to approve the linkage.
*
*/
if(! function_exists('dfrn_request_post')) {
function dfrn_request_post(&$a) {
if(($a->argc != 2) || (! count($a->profile)))
return;
if($_POST['cancel']) {
goaway($a->get_baseurl());
}
/**
*
* 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:
*
*/
if((x($_POST,'localconfirm')) && ($_POST['localconfirm'] == 1)) {
/**
* Ensure this is a valid request
*/
if(local_user() && ($a->user['nickname'] == $a->argv[1]) && (x($_POST,'dfrn_url'))) {
$dfrn_url = notags(trim($_POST['dfrn_url']));
$aes_allow = (((x($_POST,'aes_allow')) && ($_POST['aes_allow'] == 1)) ? 1 : 0);
$confirm_key = ((x($_POST,'confirm_key')) ? $_POST['confirm_key'] : "");
$contact_record = null;
if(x($dfrn_url)) {
/**
* Lookup the contact based on their URL (which is the only unique thing we have at the moment)
*/
$r = q("SELECT * FROM `contact` WHERE `uid` = %d AND `url` = '%s' AND `self` = 0 LIMIT 1",
intval(local_user()),
dbesc($dfrn_url)
);
if(count($r)) {
if(strlen($r[0]['dfrn-id'])) {
/**
* 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 {
/**
* 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) {
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;
}
}
$dfrn_request = $parms['dfrn-request'];
/********* Escape the entire array ********/
dbesc_array($parms);
/******************************************/
/**
* Create a contact record on our site for the other person
*/
$r = q("INSERT INTO `contact` ( `uid`, `created`,`url`, `name`, `nick`, `photo`, `site-pubkey`,
`request`, `confirm`, `notify`, `poll`, `aes_allow`)
VALUES ( %d, '%s', '%s', '%s' , '%s', '%s', '%s', '%s', '%s', '%s', '%s', %d)",
intval(local_user()),
datetime_convert(),
dbesc($dfrn_url),
$parms['fn'],
$parms['nick'],
$parms['photo'],
$parms['key'],
$parms['dfrn-request'],
$parms['dfrn-confirm'],
$parms['dfrn-notify'],
$parms['dfrn-poll'],
intval($aes_allow)
);
}
if($r) {
notice( t("Introduction complete.") . EOL);
}
/**
* Allow the blocked remote notification to complete
*/
if(is_array($contact_record))
$dfrn_request = $contact_record['request'];
if(strlen($dfrn_request) && strlen($confirm_key))
$s = fetch_url($dfrn_request . '?confirm_key=' . $confirm_key);
// (ignore reply, nothing we can do it failed)
goaway($dfrn_url);
return; // NOTREACHED
}
}
// invalid/bogus request
notice( t('Unrecoverable protocol error.') . EOL );
goaway($a->get_baseurl());
return; // NOTREACHED
}
/**
* 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 $a->profile.
*
*/
if(! (is_array($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;
$parms = null;
if( x($_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(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
*
*/
$r = q("SELECT `intro`.*, `intro`.`id` AS `iid`, `contact`.`id` AS `cid`, `contact`.`rel`
FROM `intro` LEFT JOIN `contact` on `intro`.`contact-id` = `contact`.`id`
WHERE `intro`.`blocked` = 1 AND `contact`.`self` = 0 AND `intro`.`datetime` < UTC_TIMESTAMP() - INTERVAL 30 MINUTE ");
if(count($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'])
);
}
}
$url = trim($_POST['dfrn_url']);
if(! strlen($url)) {
notice( t("Invalid locator") . EOL );
return;
}
// Canonicalise email-style profile locator
$url = webfinger_dfrn($url);
if(substr($url,0,5) === 'stat:') {
$network = 'stat';
$url = substr($url,5);
}
else {
$network = 'dfrn';
}
logger('dfrn_request: url: ' . $url);
if(! strlen($url)) {
notice( t("Unable to resolve your name at the provided location.") . EOL);
return;
}
if($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($ret[0]['issued-id'])) {
notice( t('You have already introduced yourself here.') . EOL );
return;
}
elseif($ret[0]['rel'] == REL_BUD) {
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($contact_record['id'])
);
}
else {
if(! validate_url($url)) {
notice( t('Invalid profile URL.') . EOL);
goaway($a->get_baseurl() . '/' . $a->cmd);
return; // NOTREACHED
}
if(! allowed_url($url)) {
notice( t('Disallowed profile URL.') . EOL);
goaway($a->get_baseurl() . '/' . $a->cmd);
return; // NOTREACHED
}
require_once('Scrape.php');
$parms = scrape_dfrn($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) {
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;
}
}
$parms['url'] = $url;
$parms['issued-id'] = $issued_id;
dbesc_array($parms);
$r = q("INSERT INTO `contact` ( `uid`, `created`, `url`, `name`, `nick`, `issued-id`, `photo`, `site-pubkey`,
`request`, `confirm`, `notify`, `poll` )
VALUES ( %d, '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s' )",
intval($uid),
datetime_convert(),
$parms['url'],
$parms['fn'],
$parms['nick'],
$parms['issued-id'],
$parms['photo'],
$parms['key'],
$parms['dfrn-request'],
$parms['dfrn-confirm'],
$parms['dfrn-notify'],
$parms['dfrn-poll']
);
// find the contact record we just created
if($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;
}
$hash = random_string() . (string) time(); // Generate a confirm_key
if(is_array($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.
if(! $failed)
notice( t('Your introduction has been sent.') . EOL );
// "Homecoming" - send the requestor back to their site to record the introduction.
$dfrn_url = bin2hex($a->get_baseurl() . '/profile/' . $nickname);
$aes_allow = ((function_exists('openssl_encrypt')) ? 1 : 0);
goaway($parms['dfrn-request'] . "?dfrn_url=$dfrn_url"
. '&dfrn_version=' . DFRN_PROTOCOL_VERSION
. '&confirm_key=' . $hash
. (($aes_allow) ? "&aes_allow=1" : "")
);
// NOTREACHED
// END $network === 'dfrn'
}
elseif($network === 'stat') {
/**
*
* OStatus network
* Check contact existence
* Try and scrape together enough information to create a contact record, with us as REL_VIP
* 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
// END $network === 'stat'
}
} return;
}}
if(! function_exists('dfrn_request_content')) {
function dfrn_request_content(&$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()) {
notice( t("Please login to confirm introduction.") . EOL );
/* 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,'/');
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);
return login();
}
$dfrn_url = notags(trim(hex2bin($_GET['dfrn_url'])));
$aes_allow = (((x($_GET,'aes_allow')) && ($_GET['aes_allow'] == 1)) ? 1 : 0);
$confirm_key = (x($_GET,'confirm_key') ? $_GET['confirm_key'] : "");
$o .= load_view_file("view/dfrn_req_confirm.tpl");
$o = replace_macros($o,array(
'$dfrn_url' => $dfrn_url,
'$aes_allow' => (($aes_allow) ? '<input type="hidden" name="aes_allow" value="1" />' : "" ),
'$confirm_key' => $confirm_key,
'$username' => $a->user['username'],
'$uid' => $_SESSION['uid'],
'$nickname' => $a->user['nickname'],
'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)
$auto_confirm = true;
if(($r[0]['notify-flags'] & NOTIFY_INTRO) && (! $auto_confirm)) {
$email_tpl = load_view_file('view/request_notify_eml.tpl');
$email = replace_macros($email_tpl, array(
'$requestor' => ((strlen(stripslashes($r[0]['name']))) ? stripslashes($r[0]['name']) : t('[Name Withheld]')),
'$url' => stripslashes($r[0]['url']),
'$myname' => $r[0]['username'],
'$siteurl' => $a->get_baseurl(),
'$sitename' => $a->config['sitename']
));
$res = mail($r[0]['email'],
t("Introduction received at ") . $a->config['sitename'],
$email,
'From: ' . t('Administrator') . '@' . $_SERVER['SERVER_NAME'] );
// This is a redundant notification - no point throwing errors if it fails.
}
if($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) {
// 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'])
);
}
}
killme();
return; // NOTREACHED
}
else {
/**
* Normal web request. Display our user's introduction form.
*/
/**
* Try to auto-fill the profile address
*/
if(local_user()) {
if(strlen($a->path)) {
$myaddr = $a->get_baseurl() . '/profile/' . $a->user['nickname'];
}
else {
$myaddr = $a->user['nickname'] . '@' . substr($a->get_baseurl(), strpos($a->get_baseurl(),'://') + 3 );
}
}
elseif(x($_GET,'addr')) {
$myaddr = hex2bin($_GET['addr']);
}
else {
/* $_GET variables are already urldecoded */
$myaddr = ((x($_GET,'address')) ? $_GET['address'] : '');
}
/**
*
* The auto_request form only has the profile address
* because nobody is going to read the comments and
* it doesn't matter if they know you or not.
*
*/
if($a->profile['page-flags'] == PAGE_NORMAL)
$tpl = load_view_file('view/dfrn_request.tpl');
else
$tpl = load_view_file('view/auto_request.tpl');
$o .= replace_macros($tpl,array(
'$header' => t('Friend/Connection Request'),
'$pls_answer' => t('Please answer the following:'),
'$does_know' => t('Does $name know you?'),
'$yes' => t('Yes'),
'$no' => t('No'),
'$add_note' => t('Add a personal note:'),
'$page_desc' => t('Please enter your profile address from one of the following supported social networks:'),
'$friendika' => t('Friendika'),
'$statusnet' => t('StatusNet/Federated Social Web'),
'$private_net' => t("Private \x28secure\x29 network"),
'$public_net' => t("Public \x28insecure\x29 network"),
'$your_address' => t('Your profile address:'),
'$submit' => t('Submit Request'),
'$cancel' => t('Cancel'),
'$nickname' => $a->argv[1],
'$name' => $a->profile['name'],
'$myaddr' => $myaddr
));
return $o;
}
return; // Somebody is fishing.
}}
