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friendica/mod/dfrn_request.php

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<?php
/**
* @file mod/dfrn_request.php
* @brief Module: dfrn_request
*
* 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
*/
use Friendica\App;
use Friendica\Core\Config;
use Friendica\Core\L10n;
use Friendica\Core\PConfig;
use Friendica\Core\System;
use Friendica\Database\DBM;
use Friendica\Model\Contact;
use Friendica\Model\Group;
use Friendica\Model\Profile;
use Friendica\Model\User;
use Friendica\Module\Login;
use Friendica\Network\Probe;
use Friendica\Util\DateTimeFormat;
use Friendica\Util\Network;
require_once 'include/enotify.php';
function dfrn_request_init(App $a)
{
if ($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.
*
*/
function dfrn_request_post(App $a)
{
if (($a->argc != 2) || (!count($a->profile))) {
logger('Wrong count of argc or profiles: argc=' . $a->argc . ',profile()=' . count($a->profile));
return;
}
if (x($_POST, 'cancel')) {
goaway(System::baseUrl());
}
/*
* Scenario 2: We've introduced ourself to another cell, then have been returned to our own cell
* to confirm the request, and then we've clicked submit (perhaps after logging in).
* That brings us here:
*/
if ((x($_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'] : "");
$hidden = ((x($_POST, 'hidden-contact')) ? intval($_POST['hidden-contact']) : 0);
$contact_record = null;
$blocked = 1;
$pending = 1;
if (x($dfrn_url)) {
// Lookup the contact based on their URL (which is the only unique thing we have at the moment)
$r = q("SELECT * FROM `contact` WHERE `uid` = %d AND `nurl` = '%s' AND NOT `self` LIMIT 1",
intval(local_user()),
dbesc(normalise_link($dfrn_url))
);
if (DBM::is_result($r)) {
if (strlen($r[0]['dfrn-id'])) {
// We don't need to be here. It has already happened.
notice(L10n::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 {
// Scrape the other site's profile page to pick up the dfrn links, key, fn, and photo
$parms = Probe::profile($dfrn_url);
if (!count($parms)) {
notice(L10n::t('Profile location is not valid or does not contain profile information.') . EOL);
return;
} else {
if (!x($parms, 'fn')) {
notice(L10n::t('Warning: profile location has no identifiable owner name.') . EOL);
}
if (!x($parms, 'photo')) {
notice(L10n::t('Warning: profile location has no profile photo.') . EOL);
}
$invalid = Probe::validDfrn($parms);
if ($invalid) {
notice(L10n::tt("%d required parameter was not found at the given location", "%d required parameters were not found at the given location", $invalid) . EOL);
return;
}
}
$dfrn_request = $parms['dfrn-request'];
$photo = $parms["photo"];
// Escape the entire array
DBM::esc_array($parms);
// Create a contact record on our site for the other person
$r = q("INSERT INTO `contact` ( `uid`, `created`,`url`, `nurl`, `addr`, `name`, `nick`, `photo`, `site-pubkey`,
`request`, `confirm`, `notify`, `poll`, `poco`, `network`, `aes_allow`, `hidden`, `blocked`, `pending`)
VALUES ( %d, '%s', '%s', '%s', '%s', '%s' , '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', %d, %d, %d, %d)",
intval(local_user()),
DateTimeFormat::utcNow(),
dbesc($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(L10n::t("Introduction complete.") . EOL);
}
$r = q("SELECT `id`, `network` FROM `contact` WHERE `uid` = %d AND `url` = '%s' AND `site-pubkey` = '%s' LIMIT 1",
intval(local_user()),
dbesc($dfrn_url),
$parms['key'] // this was already escaped
);
if (DBM::is_result($r)) {
Group::addMember(User::getDefaultGroup(local_user(), $r[0]["network"]), $r[0]['id']);
if (isset($photo)) {
Contact::updateAvatar($photo, local_user(), $r[0]["id"], true);
}
$forwardurl = System::baseUrl() . "/contacts/" . $r[0]['id'];
} else {
$forwardurl = System::baseUrl() . "/contacts";
}
// Allow the blocked remote notification to complete
if (is_array($contact_record)) {
$dfrn_request = $contact_record['request'];
}
if (strlen($dfrn_request) && strlen($confirm_key)) {
$s = Network::fetchUrl($dfrn_request . '?confirm_key=' . $confirm_key);
}
// (ignore reply, nothing we can do it failed)
// Old: goaway(Profile::zrl($dfrn_url));
goaway($forwardurl);
return; // NOTREACHED
}
}
// invalid/bogus request
notice(L10n::t('Unrecoverable protocol error.') . EOL);
goaway(System::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(L10n::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;
$pending = 1;
if (x($_POST, 'dfrn_url')) {
// Block friend request spam
if ($maxreq) {
$r = q("SELECT * FROM `intro` WHERE `datetime` > '%s' AND `uid` = %d",
dbesc(DateTimeFormat::utc('now - 24 hours')),
intval($uid)
);
if (DBM::is_result($r) && count($r) > $maxreq) {
notice(L10n::t('%s has received too many connection requests today.', $a->profile['name']) . EOL);
notice(L10n::t('Spam protection measures have been invoked.') . EOL);
notice(L10n::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
*/
$r = q("SELECT `intro`.*, `intro`.`id` AS `iid`, `contact`.`id` AS `cid`, `contact`.`rel`
FROM `intro` LEFT JOIN `contact` on `intro`.`contact-id` = `contact`.`id`
WHERE `intro`.`blocked` = 1 AND `contact`.`self` = 0
AND `intro`.`datetime` < UTC_TIMESTAMP() - INTERVAL 30 MINUTE "
);
if (DBM::is_result($r)) {
foreach ($r as $rr) {
if (!$rr['rel']) {
dba::delete('contact', ['id' => $rr['cid'], 'self' => false]);
}
dba::delete('intro', ['id' => $rr['iid']]);
}
}
$real_name = x($_POST, 'realname') ? notags(trim($_POST['realname'])) : '';
$url = trim($_POST['dfrn_url']);
if (!strlen($url)) {
notice(L10n::t("Invalid locator") . EOL);
return;
}
$hcard = '';
// Detect the network
$data = Probe::uri($url);
$network = $data["network"];
// Canonicalise email-style profile locator
$url = Probe::webfingerDfrn($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($ret[0]['issued-id'])) {
notice(L10n::t('You have already introduced yourself here.') . EOL);
return;
} elseif ($ret[0]['rel'] == CONTACT_IS_FRIEND) {
notice(L10n::t('Apparently you are already friends with %s.', $a->profile['name']) . EOL);
return;
} else {
$contact_record = $ret[0];
$parms = ['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'])
);
} else {
$url = Network::isUrlValid($url);
if (!$url) {
notice(L10n::t('Invalid profile URL.') . EOL);
goaway(System::baseUrl() . '/' . $a->cmd);
return; // NOTREACHED
}
if (!Network::isUrlAllowed($url)) {
notice(L10n::t('Disallowed profile URL.') . EOL);
goaway(System::baseUrl() . '/' . $a->cmd);
return; // NOTREACHED
}
if (Network::isUrlBlocked($url)) {
notice(L10n::t('Blocked domain') . EOL);
goaway(System::baseUrl() . '/' . $a->cmd);
return; // NOTREACHED
}
$parms = Probe::profile(($hcard) ? $hcard : $url);
if (!count($parms)) {
notice(L10n::t('Profile location is not valid or does not contain profile information.') . EOL);
goaway(System::baseUrl() . '/' . $a->cmd);
} else {
if (!x($parms, 'fn')) {
notice(L10n::t('Warning: profile location has no identifiable owner name.') . EOL);
}
if (!x($parms, 'photo')) {
notice(L10n::t('Warning: profile location has no profile photo.') . EOL);
}
$invalid = Probe::validDfrn($parms);
if ($invalid) {
notice(L10n::tt("%d required parameter was not found at the given location", "%d required parameters were not found at the given location", $invalid) . EOL);
return;
}
}
$parms['url'] = $url;
$parms['issued-id'] = $issued_id;
$photo = $parms["photo"];
DBM::esc_array($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(DateTimeFormat::utcNow()),
$parms['url'],
dbesc(normalise_link($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($pending)
);
// find the contact record we just created
if ($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 = $r[0];
Contact::updateAvatar($photo, $uid, $contact_record["id"], true);
}
}
}
if ($r === false) {
notice(L10n::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($hash),
dbesc(DateTimeFormat::utcNow())
);
}
// This notice will only be seen by the requestor if the requestor and requestee are on the same server.
if (!$failed) {
info(L10n::t('Your introduction has been sent.') . EOL);
}
// "Homecoming" - send the requestor back to their site to record the introduction.
$dfrn_url = bin2hex(System::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 $network === NETWORK_DFRN
} elseif (($network != NETWORK_PHANTOM) && ($url != "")) {
/* 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 = System::baseUrl() . '/profile/' . $nickname;
}
$url = str_replace('{uri}', $uri, $url);
goaway($url);
// NOTREACHED
// END $network != NETWORK_PHANTOM
} else {
notice(L10n::t("Remote subscription can't be done for your network. Please subscribe directly on your system.") . EOL);
return;
}
} return;
}
function dfrn_request_content(App $a)
{
if (($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(L10n::t("Please login to confirm introduction.") . EOL);
/* setup the return URL to come back to this page if they use openid */
return Login::form();
}
// 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(L10n::t("Incorrect identity currently logged in. Please login to <strong>this</strong> profile.") . EOL);
return Login::form();
}
$dfrn_url = notags(trim(hex2bin($_GET['dfrn_url'])));
$aes_allow = x($_GET, 'aes_allow') && $_GET['aes_allow'] == 1 ? 1 : 0;
$confirm_key = x($_GET, 'confirm_key') ? $_GET['confirm_key'] : "";
// Checking fastlane for validity
if (x($_SESSION, "fastlane") && (normalise_link($_SESSION["fastlane"]) == normalise_link($dfrn_url))) {
$_POST["dfrn_url"] = $dfrn_url;
$_POST["confirm_key"] = $confirm_key;
$_POST["localconfirm"] = 1;
$_POST["hidden-contact"] = 0;
$_POST["submit"] = L10n::t('Confirm');
dfrn_request_post($a);
killme();
return; // NOTREACHED
}
$tpl = get_markup_template("dfrn_req_confirm.tpl");
$o = replace_macros($tpl, [
'$dfrn_url' => $dfrn_url,
'$aes_allow' => (($aes_allow) ? '<input type="hidden" name="aes_allow" value="1" />' : "" ),
'$hidethem' => L10n::t('Hide this contact'),
'$hidechecked' => '',
'$confirm_key' => $confirm_key,
'$welcome' => L10n::t('Welcome home %s.', $a->user['username']),
'$please' => L10n::t('Please confirm your introduction/connection request to %s.', $dfrn_url),
'$submit' => L10n::t('Confirm'),
'$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 (DBM::is_result($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'])
);
$auto_confirm = false;
if (DBM::is_result($r)) {
if ($r[0]['page-flags'] != PAGE_NORMAL && $r[0]['page-flags'] != PAGE_PRVGROUP) {
$auto_confirm = true;
}
if (!$auto_confirm) {
notification([
'type' => NOTIFY_INTRO,
'notify_flags' => $r[0]['notify-flags'],
'language' => $r[0]['language'],
'to_name' => $r[0]['username'],
'to_email' => $r[0]['email'],
'uid' => $r[0]['uid'],
'link' => System::baseUrl() . '/notifications/intros',
'source_name' => ((strlen(stripslashes($r[0]['name']))) ? stripslashes($r[0]['name']) : L10n::t('[Name Withheld]')),
'source_link' => $r[0]['url'],
'source_photo' => $r[0]['photo'],
'verb' => ACTIVITY_REQ_FRIEND,
'otype' => 'intro'
]);
}
if ($auto_confirm) {
require_once 'mod/dfrn_confirm.php';
$handsfree = [
'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()
$r = q("UPDATE `intro` SET `blocked` = 0 WHERE `hash` = '%s'",
dbesc($_GET['confirm_key'])
);
}
}
killme();
return; // NOTREACHED
} else {
// Normal web request. Display our user's introduction form.
if ((Config::get('system', 'block_public')) && (!local_user()) && (!remote_user())) {
if (!Config::get('system', 'local_block')) {
notice(L10n::t('Public access denied.') . EOL);
return;
}
}
// Try to auto-fill the profile address
// At first look if an address was provided
// Otherwise take the local address
if (x($_GET, 'addr') && ($_GET['addr'] != "")) {
$myaddr = hex2bin($_GET['addr']);
} elseif (x($_GET, 'address') && ($_GET['address'] != "")) {
$myaddr = $_GET['address'];
} elseif (local_user()) {
if (strlen($a->path)) {
$myaddr = System::baseUrl() . '/profile/' . $a->user['nickname'];
} else {
$myaddr = $a->user['nickname'] . '@' . substr(System::baseUrl(), strpos(System::baseUrl(), '://') + 3);
}
} else {
// last, try a zrl
$myaddr = Profile::getMyURL();
}
$target_addr = $a->profile['nickname'] . '@' . substr(System::baseUrl(), strpos(System::baseUrl(), '://') + 3);
/* The auto_request form only has the profile address
* because nobody is going to read the comments and
* it doesn't matter if they know you or not.
*/
if ($a->profile['page-flags'] == PAGE_NORMAL) {
$tpl = get_markup_template('dfrn_request.tpl');
} else {
$tpl = get_markup_template('auto_request.tpl');
}
$page_desc = L10n::t("Please enter your 'Identity Address' from one of the following supported communications networks:");
$invite_desc = sprintf(
L10n::t('If you are not yet a member of the free social web, <a href="%s">follow this link to find a public Friendica site and join us today</a>.'),
get_server() . '/servers'
);
$o = replace_macros($tpl, [
'$header' => L10n::t('Friend/Connection Request'),
'$desc' => L10n::t('Examples: jojo@demo.friendica.com, http://demo.friendica.com/profile/jojo, testuser@gnusocial.de'),
'$pls_answer' => L10n::t('Please answer the following:'),
'$does_know_you' => ['knowyou', L10n::t('Does %s know you?', $a->profile['name']), false, '', [L10n::t('No'), L10n::t('Yes')]],
'$add_note' => L10n::t('Add a personal note:'),
'$page_desc' => $page_desc,
'$friendica' => L10n::t('Friendica'),
'$statusnet' => L10n::t("GNU Social \x28Pleroma, Mastodon\x29"),
'$diaspora' => L10n::t("Diaspora \x28Socialhome, Hubzilla\x29"),
'$diasnote' => L10n::t(' - please do not use this form. Instead, enter %s into your Diaspora search bar.', $target_addr),
'$your_address' => L10n::t('Your Identity Address:'),
'$invite_desc' => $invite_desc,
'$submit' => L10n::t('Submit Request'),
'$cancel' => L10n::t('Cancel'),
'$nickname' => $a->argv[1],
'$name' => $a->profile['name'],
'$myaddr' => $myaddr
]);
return $o;
}
return; // Somebody is fishing.
}
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