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friendica-github/mod/dfrn_request.php

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<?php
/**
* @copyright Copyright (C) 2020, Friendica
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*Handles communication associated with the issuance of friend requests.
*
* @see PDF with dfrn specs: https://github.com/friendica/friendica/blob/stable/spec/dfrn2.pdf
* You also find a graphic which describes the confirmation process at
* https://github.com/friendica/friendica/blob/stable/spec/dfrn2_contact_request.png
*/
use Friendica\App;
use Friendica\Core\Logger;
use Friendica\Core\Protocol;
use Friendica\Core\Renderer;
use Friendica\Core\Search;
use Friendica\Core\Session;
use Friendica\Core\System;
use Friendica\Database\DBA;
use Friendica\DI;
use Friendica\Model\Contact;
use Friendica\Model\Group;
use Friendica\Model\Notify;
use Friendica\Model\Notify\Type;
use Friendica\Model\Profile;
use Friendica\Model\User;
use Friendica\Module\Security\Login;
use Friendica\Network\Probe;
use Friendica\Protocol\Activity;
use Friendica\Util\DateTimeFormat;
use Friendica\Util\Network;
use Friendica\Util\Strings;
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.
*
* @param App $a
* @throws ImagickException
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
*/
function dfrn_request_post(App $a)
{
if ($a->argc != 2 || empty($a->profile)) {
Logger::log('Wrong count of argc or profiles: argc=' . $a->argc . ', profile()=' . count($a->profile ?? []));
return;
}
if (!empty($_POST['cancel'])) {
DI::baseUrl()->redirect();
}
/*
* Scenario 2: We've introduced ourself to another cell, then have been returned to our own cell
* to confirm the request, and then we've clicked submit (perhaps after logging in).
* That brings us here:
*/
if (!empty($_POST['localconfirm']) && ($_POST['localconfirm'] == 1)) {
// Ensure this is a valid request
if (local_user() && ($a->user['nickname'] == $a->argv[1]) && !empty($_POST['dfrn_url'])) {
$dfrn_url = Strings::escapeTags(trim($_POST['dfrn_url']));
$aes_allow = !empty($_POST['aes_allow']);
$confirm_key = $_POST['confirm_key'] ?? '';
$hidden = (!empty($_POST['hidden-contact']) ? intval($_POST['hidden-contact']) : 0);
$contact_record = null;
$blocked = 1;
$pending = 1;
if (!empty($dfrn_url)) {
// Lookup the contact based on their URL (which is the only unique thing we have at the moment)
$r = q("SELECT * FROM `contact` WHERE `uid` = %d AND `nurl` = '%s' AND NOT `self` LIMIT 1",
intval(local_user()),
DBA::escape(Strings::normaliseLink($dfrn_url))
);
if (DBA::isResult($r)) {
if (strlen($r[0]['dfrn-id'])) {
// We don't need to be here. It has already happened.
notice(DI::l10n()->t("This introduction has already been accepted."));
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($parms)) {
notice(DI::l10n()->t('Profile location is not valid or does not contain profile information.'));
return;
} else {
if (empty($parms['fn'])) {
notice(DI::l10n()->t('Warning: profile location has no identifiable owner name.'));
}
if (empty($parms['photo'])) {
notice(DI::l10n()->t('Warning: profile location has no profile photo.'));
}
$invalid = Probe::validDfrn($parms);
if ($invalid) {
notice(DI::l10n()->tt("%d required parameter was not found at the given location", "%d required parameters were not found at the given location", $invalid));
return;
}
}
$dfrn_request = $parms['dfrn-request'];
$photo = $parms["photo"];
// Escape the entire array
DBA::escapeArray($parms);
// Create a contact record on our site for the other person
$r = q("INSERT INTO `contact` ( `uid`, `created`,`url`, `nurl`, `addr`, `name`, `nick`, `photo`, `site-pubkey`,
`request`, `confirm`, `notify`, `poll`, `network`, `aes_allow`, `hidden`, `blocked`, `pending`)
VALUES ( %d, '%s', '%s', '%s', '%s', '%s' , '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', %d, %d, %d, %d)",
intval(local_user()),
DateTimeFormat::utcNow(),
DBA::escape($dfrn_url),
DBA::escape(Strings::normaliseLink($dfrn_url)),
$parms['addr'],
$parms['fn'],
$parms['nick'],
$parms['photo'],
$parms['key'],
$parms['dfrn-request'],
$parms['dfrn-confirm'],
$parms['dfrn-notify'],
$parms['dfrn-poll'],
DBA::escape(Protocol::DFRN),
intval($aes_allow),
intval($hidden),
intval($blocked),
intval($pending)
);
}
if ($r) {
info(DI::l10n()->t("Introduction complete."));
}
$r = q("SELECT `id`, `network` FROM `contact` WHERE `uid` = %d AND `url` = '%s' AND `site-pubkey` = '%s' LIMIT 1",
intval(local_user()),
DBA::escape($dfrn_url),
$parms['key'] ?? '' // Potentially missing
);
if (DBA::isResult($r)) {
Group::addMember(User::getDefaultGroup(local_user(), $r[0]["network"]), $r[0]['id']);
if (isset($photo)) {
Contact::updateAvatar($r[0]["id"], $photo, true);
}
$forward_path = "contact/" . $r[0]['id'];
} else {
$forward_path = "contact";
}
// Allow the blocked remote notification to complete
if (is_array($contact_record)) {
$dfrn_request = $contact_record['request'];
}
if (!empty($dfrn_request) && strlen($confirm_key)) {
DI::httpRequest()->fetch($dfrn_request . '?confirm_key=' . $confirm_key);
}
// (ignore reply, nothing we can do it failed)
DI::baseUrl()->redirect($forward_path);
return; // NOTREACHED
}
}
// invalid/bogus request
notice(DI::l10n()->t('Unrecoverable protocol error.'));
DI::baseUrl()->redirect();
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 $a->profile.
*
*/
if (empty($a->profile['uid'])) {
notice(DI::l10n()->t('Profile unavailable.'));
return;
}
$nickname = $a->profile['nickname'];
$uid = $a->profile['uid'];
$maxreq = intval($a->profile['maxreq']);
$contact_record = null;
$failed = false;
$parms = null;
$blocked = 1;
$pending = 1;
if (!empty($_POST['dfrn_url'])) {
// Block friend request spam
if ($maxreq) {
$r = q("SELECT * FROM `intro` WHERE `datetime` > '%s' AND `uid` = %d",
DBA::escape(DateTimeFormat::utc('now - 24 hours')),
intval($uid)
);
if (DBA::isResult($r) && count($r) > $maxreq) {
notice(DI::l10n()->t('%s has received too many connection requests today.', $a->profile['name']));
notice(DI::l10n()->t('Spam protection measures have been invoked.'));
notice(DI::l10n()->t('Friends are advised to please try again in 24 hours.'));
return;
}
}
/* Cleanup old introductions that remain blocked.
* Also remove the contact record, but only if there is no existing relationship
*/
$r = q("SELECT `intro`.*, `intro`.`id` AS `iid`, `contact`.`id` AS `cid`, `contact`.`rel`
FROM `intro` LEFT JOIN `contact` on `intro`.`contact-id` = `contact`.`id`
WHERE `intro`.`blocked` = 1 AND `contact`.`self` = 0
AND `intro`.`datetime` < UTC_TIMESTAMP() - INTERVAL 30 MINUTE "
);
if (DBA::isResult($r)) {
foreach ($r as $rr) {
if (!$rr['rel']) {
DBA::delete('contact', ['id' => $rr['cid'], 'self' => false]);
}
DBA::delete('intro', ['id' => $rr['iid']]);
}
}
$url = trim($_POST['dfrn_url']);
if (!strlen($url)) {
notice(DI::l10n()->t("Invalid locator"));
return;
}
$hcard = '';
// Detect the network
$data = Contact::getByURL($url);
$network = $data["network"];
// Canonicalize email-style profile locator
$url = Probe::webfingerDfrn($data['url'] ?? $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 != Protocol::DIASPORA) {
$network = Protocol::OSTATUS;
}
$url = substr($url, 5);
} else {
$network = Protocol::DFRN;
}
Logger::log('dfrn_request: url: ' . $url . ',network=' . $network, Logger::DEBUG);
if ($network === Protocol::DFRN) {
$ret = q("SELECT * FROM `contact` WHERE `uid` = %d AND `url` = '%s' AND `self` = 0 LIMIT 1",
intval($uid),
DBA::escape($url)
);
if (DBA::isResult($ret)) {
if (strlen($ret[0]['issued-id'])) {
notice(DI::l10n()->t('You have already introduced yourself here.'));
return;
} elseif ($ret[0]['rel'] == Contact::FRIEND) {
notice(DI::l10n()->t('Apparently you are already friends with %s.', $a->profile['name']));
return;
} else {
$contact_record = $ret[0];
$parms = ['dfrn-request' => $ret[0]['request']];
}
}
$issued_id = Strings::getRandomHex();
if (is_array($contact_record)) {
// There is a contact record but no issued-id, so this
// is a reciprocal introduction from a known contact
$r = q("UPDATE `contact` SET `issued-id` = '%s' WHERE `id` = %d",
DBA::escape($issued_id),
intval($contact_record['id'])
);
} else {
$url = Network::isUrlValid($url);
if (!$url) {
notice(DI::l10n()->t('Invalid profile URL.'));
DI::baseUrl()->redirect(DI::args()->getCommand());
return; // NOTREACHED
}
if (!Network::isUrlAllowed($url)) {
notice(DI::l10n()->t('Disallowed profile URL.'));
DI::baseUrl()->redirect(DI::args()->getCommand());
return; // NOTREACHED
}
if (Network::isUrlBlocked($url)) {
notice(DI::l10n()->t('Blocked domain'));
DI::baseUrl()->redirect(DI::args()->getCommand());
return; // NOTREACHED
}
$parms = Probe::profile(($hcard) ? $hcard : $url);
if (!count($parms)) {
notice(DI::l10n()->t('Profile location is not valid or does not contain profile information.'));
DI::baseUrl()->redirect(DI::args()->getCommand());
} else {
if (empty($parms['fn'])) {
notice(DI::l10n()->t('Warning: profile location has no identifiable owner name.'));
}
if (empty($parms['photo'])) {
notice(DI::l10n()->t('Warning: profile location has no profile photo.'));
}
$invalid = Probe::validDfrn($parms);
if ($invalid) {
notice(DI::l10n()->tt("%d required parameter was not found at the given location", "%d required parameters were not found at the given location", $invalid));
return;
}
}
$parms['url'] = $url;
$parms['issued-id'] = $issued_id;
$photo = $parms["photo"];
DBA::escapeArray($parms);
$r = q("INSERT INTO `contact` ( `uid`, `created`, `url`, `nurl`, `addr`, `name`, `nick`, `issued-id`, `photo`, `site-pubkey`,
`request`, `confirm`, `notify`, `poll`, `network`, `blocked`, `pending` )
VALUES ( %d, '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', %d, %d )",
intval($uid),
DBA::escape(DateTimeFormat::utcNow()),
$parms['url'],
DBA::escape(Strings::normaliseLink($url)),
$parms['addr'],
$parms['fn'],
$parms['nick'],
$parms['issued-id'],
$parms['photo'],
$parms['key'],
$parms['dfrn-request'],
$parms['dfrn-confirm'],
$parms['dfrn-notify'],
$parms['dfrn-poll'],
DBA::escape(Protocol::DFRN),
intval($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'],
$parms['issued-id']
);
if (DBA::isResult($r)) {
$contact_record = $r[0];
Contact::updateAvatar($contact_record["id"], $photo, true);
}
}
}
if ($r === false) {
notice(DI::l10n()->t('Failed to update contact record.'));
return;
}
$hash = Strings::getRandomHex() . (string) time(); // Generate a confirm_key
if (is_array($contact_record)) {
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']),
intval(!empty($_POST['knowyou'])),
DBA::escape(Strings::escapeTags(trim($_POST['dfrn-request-message'] ?? ''))),
DBA::escape($hash),
DBA::escape(DateTimeFormat::utcNow())
);
}
// This notice will only be seen by the requestor if the requestor and requestee are on the same server.
if (!$failed) {
info(DI::l10n()->t('Your introduction has been sent.'));
}
// "Homecoming" - send the requestor back to their site to record the introduction.
$dfrn_url = bin2hex(DI::baseUrl()->get() . '/profile/' . $nickname);
$aes_allow = ((function_exists('openssl_encrypt')) ? 1 : 0);
System::externalRedirect($parms['dfrn-request'] . "?dfrn_url=$dfrn_url"
. '&dfrn_version=' . DFRN_PROTOCOL_VERSION
. '&confirm_key=' . $hash
. (($aes_allow) ? "&aes_allow=1" : "")
);
// NOTREACHED
// END $network === Protocol::DFRN
} elseif (($network != Protocol::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 == Protocol::DIASPORA) {
$uri = urlencode($a->profile['addr']);
} else {
$uri = urlencode($a->profile['url']);
}
$url = str_replace('{uri}', $uri, $url);
System::externalRedirect($url);
// NOTREACHED
// END $network != Protocol::PHANTOM
} else {
notice(DI::l10n()->t("Remote subscription can't be done for your network. Please subscribe directly on your system."));
return;
}
} return;
}
function dfrn_request_content(App $a)
{
if ($a->argc != 2 || empty($a->profile)) {
return "";
}
// "Homecoming". Make sure we're logged in to this site as the correct user. Then offer a confirm button
// to send us to the post section to record the introduction.
if (!empty($_GET['dfrn_url'])) {
if (!local_user()) {
info(DI::l10n()->t("Please login to confirm introduction."));
/* 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(DI::l10n()->t("Incorrect identity currently logged in. Please login to <strong>this</strong> profile."));
return Login::form();
}
$dfrn_url = Strings::escapeTags(trim(hex2bin($_GET['dfrn_url'])));
$aes_allow = !empty($_GET['aes_allow']);
$confirm_key = $_GET['confirm_key'] ?? '';
// Checking fastlane for validity
if (!empty($_SESSION['fastlane']) && (Strings::normaliseLink($_SESSION["fastlane"]) == Strings::normaliseLink($dfrn_url))) {
$_POST["dfrn_url"] = $dfrn_url;
$_POST["confirm_key"] = $confirm_key;
$_POST["localconfirm"] = 1;
$_POST["hidden-contact"] = 0;
$_POST["submit"] = DI::l10n()->t('Confirm');
dfrn_request_post($a);
exit();
}
$tpl = Renderer::getMarkupTemplate("dfrn_req_confirm.tpl");
$o = Renderer::replaceMacros($tpl, [
'$dfrn_url' => $dfrn_url,
'$aes_allow' => (($aes_allow) ? '<input type="hidden" name="aes_allow" value="1" />' : "" ),
'$hidethem' => DI::l10n()->t('Hide this contact'),
'$confirm_key' => $confirm_key,
'$welcome' => DI::l10n()->t('Welcome home %s.', $a->user['username']),
'$please' => DI::l10n()->t('Please confirm your introduction/connection request to %s.', $dfrn_url),
'$submit' => DI::l10n()->t('Confirm'),
'$uid' => $_SESSION['uid'],
'$nickname' => $a->user['nickname'],
'dfrn_rawurl' => $_GET['dfrn_url']
]);
return $o;
} elseif (!empty($_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.
$intro = q("SELECT * FROM `intro` WHERE `hash` = '%s' LIMIT 1",
DBA::escape($_GET['confirm_key'])
);
if (DBA::isResult($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'])
);
$auto_confirm = false;
if (DBA::isResult($r)) {
if ($r[0]['page-flags'] != User::PAGE_FLAGS_NORMAL && $r[0]['page-flags'] != User::PAGE_FLAGS_PRVGROUP) {
$auto_confirm = true;
}
if (!$auto_confirm) {
notification([
'type' => Type::INTRO,
'otype' => Notify\ObjectType::INTRO,
'verb' => Activity::REQ_FRIEND,
'uid' => $r[0]['uid'],
'cid' => $r[0]['id'],
'link' => DI::baseUrl() . '/notifications/intros',
]);
}
if ($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'] == User::PAGE_FLAGS_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()
q("UPDATE `intro` SET `blocked` = 0 WHERE `hash` = '%s'",
DBA::escape($_GET['confirm_key'])
);
}
}
exit();
} else {
// Normal web request. Display our user's introduction form.
if (DI::config()->get('system', 'block_public') && !Session::isAuthenticated()) {
if (!DI::config()->get('system', 'local_block')) {
notice(DI::l10n()->t('Public access denied.'));
return;
}
}
// Try to auto-fill the profile address
// At first look if an address was provided
// Otherwise take the local address
if (!empty($_GET['addr'])) {
$myaddr = hex2bin($_GET['addr']);
} elseif (!empty($_GET['address'])) {
$myaddr = $_GET['address'];
} elseif (local_user()) {
if (strlen(DI::baseUrl()->getUrlPath())) {
$myaddr = DI::baseUrl() . '/profile/' . $a->user['nickname'];
} else {
$myaddr = $a->user['nickname'] . '@' . substr(DI::baseUrl(), strpos(DI::baseUrl(), '://') + 3);
}
} else {
// last, try a zrl
$myaddr = Profile::getMyURL();
}
$target_addr = $a->profile['nickname'] . '@' . substr(DI::baseUrl(), strpos(DI::baseUrl(), '://') + 3);
/* The auto_request form only has the profile address
* because nobody is going to read the comments and
* it doesn't matter if they know you or not.
*/
if ($a->profile['page-flags'] == User::PAGE_FLAGS_NORMAL) {
$tpl = Renderer::getMarkupTemplate('dfrn_request.tpl');
} else {
$tpl = Renderer::getMarkupTemplate('auto_request.tpl');
}
$o = Renderer::replaceMacros($tpl, [
'$header' => DI::l10n()->t('Friend/Connection Request'),
'$page_desc' => DI::l10n()->t('Enter your Webfinger address (user@domain.tld) or profile URL here. If this isn\'t supported by your system (for example it doesn\'t work with Diaspora), you have to subscribe to <strong>%s</strong> directly on your system', $target_addr),
'$invite_desc' => DI::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 node and join us today</a>.', Search::getGlobalDirectory() . '/servers'),
'$your_address' => DI::l10n()->t('Your Webfinger address or profile URL:'),
'$pls_answer' => DI::l10n()->t('Please answer the following:'),
'$submit' => DI::l10n()->t('Submit Request'),
'$cancel' => DI::l10n()->t('Cancel'),
'$request' => 'dfrn_request/' . $a->argv[1],
'$name' => $a->profile['name'],
'$myaddr' => $myaddr,
'$does_know_you' => ['knowyou', DI::l10n()->t('%s knows you', $a->profile['name'])],
'$addnote_field' => ['dfrn-request-message', DI::l10n()->t('Add a personal note:')],
]);
return $o;
}
}
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