658 lines
22 KiB
PHP
658 lines
22 KiB
PHP
<?php
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/**
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* @file mod/dfrn_request.php
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* @brief Module: dfrn_request
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*
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* Purpose: Handles communication associated with the issuance of
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* friend requests.
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*
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* @see PDF with dfrn specs: https://github.com/friendica/friendica/blob/master/spec/dfrn2.pdf
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* You also find a graphic which describes the confirmation process at
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* https://github.com/friendica/friendica/blob/master/spec/dfrn2_contact_request.png
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*/
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use Friendica\App;
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use Friendica\Core\Config;
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use Friendica\Core\L10n;
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use Friendica\Core\Logger;
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use Friendica\Core\Protocol;
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use Friendica\Core\Renderer;
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use Friendica\Core\System;
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use Friendica\Core\Session;
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use Friendica\Database\DBA;
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use Friendica\Model\Contact;
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use Friendica\Model\Group;
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use Friendica\Model\Profile;
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use Friendica\Model\User;
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use Friendica\Module\Login;
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use Friendica\Network\Probe;
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use Friendica\Util\DateTimeFormat;
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use Friendica\Util\Network;
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use Friendica\Util\Strings;
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function dfrn_request_init(App $a)
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{
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if ($a->argc > 1) {
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$which = $a->argv[1];
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Profile::load($a, $which);
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}
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return;
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}
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/**
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* Function: dfrn_request_post
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*
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* Purpose:
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* Handles multiple scenarios.
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*
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* Scenario 1:
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* Clicking 'submit' on a friend request page.
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*
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* Scenario 2:
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* Following Scenario 1, we are brought back to our home site
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* in order to link our friend request with our own server cell.
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* After logging in, we click 'submit' to approve the linkage.
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*
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* @param App $a
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* @throws ImagickException
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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*/
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function dfrn_request_post(App $a)
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{
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if (($a->argc != 2) || (!count($a->profile))) {
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Logger::log('Wrong count of argc or profiles: argc=' . $a->argc . ',profile()=' . count($a->profile));
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return;
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}
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if (!empty($_POST['cancel'])) {
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$a->internalRedirect();
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}
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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
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* 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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*/
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if (!empty($_POST['localconfirm']) && ($_POST['localconfirm'] == 1)) {
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// Ensure this is a valid request
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if (local_user() && ($a->user['nickname'] == $a->argv[1]) && !empty($_POST['dfrn_url'])) {
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$dfrn_url = Strings::escapeTags(trim($_POST['dfrn_url']));
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$aes_allow = !empty($_POST['aes_allow']);
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$confirm_key = $_POST['confirm_key'] ?? '';
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$hidden = (!empty($_POST['hidden-contact']) ? intval($_POST['hidden-contact']) : 0);
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$contact_record = null;
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$blocked = 1;
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$pending = 1;
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if (!empty($dfrn_url)) {
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// Lookup the contact based on their URL (which is the only unique thing we have at the moment)
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$r = q("SELECT * FROM `contact` WHERE `uid` = %d AND `nurl` = '%s' AND NOT `self` LIMIT 1",
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intval(local_user()),
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DBA::escape(Strings::normaliseLink($dfrn_url))
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);
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if (DBA::isResult($r)) {
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if (strlen($r[0]['dfrn-id'])) {
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// We don't need to be here. It has already happened.
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notice(L10n::t("This introduction has already been accepted.") . EOL);
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return;
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} else {
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$contact_record = $r[0];
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}
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}
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if (is_array($contact_record)) {
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$r = q("UPDATE `contact` SET `ret-aes` = %d, hidden = %d WHERE `id` = %d",
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intval($aes_allow),
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intval($hidden),
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intval($contact_record['id'])
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);
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} else {
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// Scrape the other site's profile page to pick up the dfrn links, key, fn, and photo
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$parms = Probe::profile($dfrn_url);
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if (!count($parms)) {
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notice(L10n::t('Profile location is not valid or does not contain profile information.') . EOL);
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return;
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} else {
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if (empty($parms['fn'])) {
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notice(L10n::t('Warning: profile location has no identifiable owner name.') . EOL);
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}
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if (empty($parms['photo'])) {
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notice(L10n::t('Warning: profile location has no profile photo.') . EOL);
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}
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$invalid = Probe::validDfrn($parms);
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if ($invalid) {
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notice(L10n::tt("%d required parameter was not found at the given location", "%d required parameters were not found at the given location", $invalid) . EOL);
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return;
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}
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}
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$dfrn_request = $parms['dfrn-request'];
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$photo = $parms["photo"];
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// Escape the entire array
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DBA::escapeArray($parms);
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// Create a contact record on our site for the other person
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$r = q("INSERT INTO `contact` ( `uid`, `created`,`url`, `nurl`, `addr`, `name`, `nick`, `photo`, `site-pubkey`,
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`request`, `confirm`, `notify`, `poll`, `network`, `aes_allow`, `hidden`, `blocked`, `pending`)
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VALUES ( %d, '%s', '%s', '%s', '%s', '%s' , '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', %d, %d, %d, %d)",
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intval(local_user()),
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DateTimeFormat::utcNow(),
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DBA::escape($dfrn_url),
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DBA::escape(Strings::normaliseLink($dfrn_url)),
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$parms['addr'],
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$parms['fn'],
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$parms['nick'],
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$parms['photo'],
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$parms['key'],
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$parms['dfrn-request'],
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$parms['dfrn-confirm'],
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$parms['dfrn-notify'],
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$parms['dfrn-poll'],
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DBA::escape(Protocol::DFRN),
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intval($aes_allow),
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intval($hidden),
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intval($blocked),
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intval($pending)
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);
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}
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if ($r) {
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info(L10n::t("Introduction complete.") . EOL);
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}
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$r = q("SELECT `id`, `network` FROM `contact` WHERE `uid` = %d AND `url` = '%s' AND `site-pubkey` = '%s' LIMIT 1",
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intval(local_user()),
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DBA::escape($dfrn_url),
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$parms['key'] ?? '' // Potentially missing
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);
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if (DBA::isResult($r)) {
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Group::addMember(User::getDefaultGroup(local_user(), $r[0]["network"]), $r[0]['id']);
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if (isset($photo)) {
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Contact::updateAvatar($photo, local_user(), $r[0]["id"], true);
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}
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$forward_path = "contact/" . $r[0]['id'];
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} else {
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$forward_path = "contact";
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}
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// Allow the blocked remote notification to complete
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if (is_array($contact_record)) {
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$dfrn_request = $contact_record['request'];
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}
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if (!empty($dfrn_request) && strlen($confirm_key)) {
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Network::fetchUrl($dfrn_request . '?confirm_key=' . $confirm_key);
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}
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// (ignore reply, nothing we can do it failed)
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$a->internalRedirect($forward_path);
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return; // NOTREACHED
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}
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}
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// invalid/bogus request
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notice(L10n::t('Unrecoverable protocol error.') . EOL);
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$a->internalRedirect();
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return; // NOTREACHED
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}
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/*
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* Otherwise:
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*
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* Scenario 1:
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* We are the requestee. A person from a remote cell has made an introduction
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* on our profile web page and clicked submit. We will use their DFRN-URL to
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* figure out how to contact their cell.
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*
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* Scrape the originating DFRN-URL for everything we need. Create a contact record
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* and an introduction to show our user next time he/she logs in.
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* Finally redirect back to the requestor so that their site can record the request.
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* If our user (the requestee) later confirms this request, a record of it will need
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* to exist on the requestor's cell in order for the confirmation process to complete..
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*
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* It's possible that neither the requestor or the requestee are logged in at the moment,
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* and the requestor does not yet have any credentials to the requestee profile.
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*
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* Who is the requestee? We've already loaded their profile which means their nickname should be
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* in $a->argv[1] and we should have their complete info in $a->profile.
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*
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*/
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if (!(is_array($a->profile) && count($a->profile))) {
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notice(L10n::t('Profile unavailable.') . EOL);
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return;
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}
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$nickname = $a->profile['nickname'];
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$uid = $a->profile['uid'];
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$maxreq = intval($a->profile['maxreq']);
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$contact_record = null;
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$failed = false;
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$parms = null;
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$blocked = 1;
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$pending = 1;
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if (!empty($_POST['dfrn_url'])) {
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// Block friend request spam
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if ($maxreq) {
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$r = q("SELECT * FROM `intro` WHERE `datetime` > '%s' AND `uid` = %d",
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DBA::escape(DateTimeFormat::utc('now - 24 hours')),
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intval($uid)
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);
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if (DBA::isResult($r) && count($r) > $maxreq) {
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notice(L10n::t('%s has received too many connection requests today.', $a->profile['name']) . EOL);
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notice(L10n::t('Spam protection measures have been invoked.') . EOL);
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notice(L10n::t('Friends are advised to please try again in 24 hours.') . EOL);
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return;
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}
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}
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/* Cleanup old introductions that remain blocked.
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* Also remove the contact record, but only if there is no existing relationship
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*/
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$r = q("SELECT `intro`.*, `intro`.`id` AS `iid`, `contact`.`id` AS `cid`, `contact`.`rel`
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FROM `intro` LEFT JOIN `contact` on `intro`.`contact-id` = `contact`.`id`
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WHERE `intro`.`blocked` = 1 AND `contact`.`self` = 0
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AND `intro`.`datetime` < UTC_TIMESTAMP() - INTERVAL 30 MINUTE "
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);
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if (DBA::isResult($r)) {
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foreach ($r as $rr) {
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if (!$rr['rel']) {
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DBA::delete('contact', ['id' => $rr['cid'], 'self' => false]);
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}
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DBA::delete('intro', ['id' => $rr['iid']]);
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}
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}
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$url = trim($_POST['dfrn_url']);
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if (!strlen($url)) {
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notice(L10n::t("Invalid locator") . EOL);
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return;
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}
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$hcard = '';
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// Detect the network
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$data = Probe::uri($url);
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$network = $data["network"];
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// Canonicalise email-style profile locator
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$url = Probe::webfingerDfrn($url, $hcard);
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if (substr($url, 0, 5) === 'stat:') {
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// Every time we detect the remote subscription we define this as OStatus.
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// We do this even if it is not OStatus.
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// we only need to pass this through another section of the code.
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if ($network != Protocol::DIASPORA) {
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$network = Protocol::OSTATUS;
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}
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$url = substr($url, 5);
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} else {
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$network = Protocol::DFRN;
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}
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Logger::log('dfrn_request: url: ' . $url . ',network=' . $network, Logger::DEBUG);
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if ($network === Protocol::DFRN) {
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$ret = q("SELECT * FROM `contact` WHERE `uid` = %d AND `url` = '%s' AND `self` = 0 LIMIT 1",
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intval($uid),
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DBA::escape($url)
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);
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if (DBA::isResult($ret)) {
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if (strlen($ret[0]['issued-id'])) {
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notice(L10n::t('You have already introduced yourself here.') . EOL);
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return;
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} elseif ($ret[0]['rel'] == Contact::FRIEND) {
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notice(L10n::t('Apparently you are already friends with %s.', $a->profile['name']) . EOL);
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return;
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} else {
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$contact_record = $ret[0];
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$parms = ['dfrn-request' => $ret[0]['request']];
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}
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}
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$issued_id = Strings::getRandomHex();
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if (is_array($contact_record)) {
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// There is a contact record but no issued-id, so this
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// is a reciprocal introduction from a known contact
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$r = q("UPDATE `contact` SET `issued-id` = '%s' WHERE `id` = %d",
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DBA::escape($issued_id),
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intval($contact_record['id'])
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);
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} else {
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$url = Network::isUrlValid($url);
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if (!$url) {
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notice(L10n::t('Invalid profile URL.') . EOL);
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$a->internalRedirect($a->cmd);
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return; // NOTREACHED
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}
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if (!Network::isUrlAllowed($url)) {
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notice(L10n::t('Disallowed profile URL.') . EOL);
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$a->internalRedirect($a->cmd);
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return; // NOTREACHED
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}
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if (Network::isUrlBlocked($url)) {
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notice(L10n::t('Blocked domain') . EOL);
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$a->internalRedirect($a->cmd);
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return; // NOTREACHED
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}
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$parms = Probe::profile(($hcard) ? $hcard : $url);
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if (!count($parms)) {
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notice(L10n::t('Profile location is not valid or does not contain profile information.') . EOL);
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$a->internalRedirect($a->cmd);
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} else {
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if (empty($parms['fn'])) {
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notice(L10n::t('Warning: profile location has no identifiable owner name.') . EOL);
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}
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if (empty($parms['photo'])) {
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notice(L10n::t('Warning: profile location has no profile photo.') . EOL);
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}
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$invalid = Probe::validDfrn($parms);
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if ($invalid) {
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notice(L10n::tt("%d required parameter was not found at the given location", "%d required parameters were not found at the given location", $invalid) . EOL);
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return;
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}
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}
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$parms['url'] = $url;
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$parms['issued-id'] = $issued_id;
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$photo = $parms["photo"];
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DBA::escapeArray($parms);
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$r = q("INSERT INTO `contact` ( `uid`, `created`, `url`, `nurl`, `addr`, `name`, `nick`, `issued-id`, `photo`, `site-pubkey`,
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`request`, `confirm`, `notify`, `poll`, `network`, `blocked`, `pending` )
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VALUES ( %d, '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', %d, %d )",
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intval($uid),
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DBA::escape(DateTimeFormat::utcNow()),
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$parms['url'],
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DBA::escape(Strings::normaliseLink($url)),
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$parms['addr'],
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$parms['fn'],
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$parms['nick'],
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$parms['issued-id'],
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$parms['photo'],
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$parms['key'],
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$parms['dfrn-request'],
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$parms['dfrn-confirm'],
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$parms['dfrn-notify'],
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$parms['dfrn-poll'],
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DBA::escape(Protocol::DFRN),
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intval($blocked),
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intval($pending)
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);
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// find the contact record we just created
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if ($r) {
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$r = q("SELECT `id` FROM `contact`
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WHERE `uid` = %d AND `url` = '%s' AND `issued-id` = '%s' LIMIT 1",
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intval($uid),
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$parms['url'],
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$parms['issued-id']
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);
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if (DBA::isResult($r)) {
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$contact_record = $r[0];
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Contact::updateAvatar($photo, $uid, $contact_record["id"], true);
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}
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}
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}
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if ($r === false) {
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notice(L10n::t('Failed to update contact record.') . EOL);
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return;
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}
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$hash = Strings::getRandomHex() . (string) time(); // Generate a confirm_key
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if (is_array($contact_record)) {
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q("INSERT INTO `intro` ( `uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime`)
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VALUES ( %d, %d, 1, %d, '%s', '%s', '%s' )",
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intval($uid),
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intval($contact_record['id']),
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intval(!empty($_POST['knowyou'])),
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DBA::escape(Strings::escapeTags(trim($_POST['dfrn-request-message'] ?? ''))),
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DBA::escape($hash),
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DBA::escape(DateTimeFormat::utcNow())
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);
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}
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// This notice will only be seen by the requestor if the requestor and requestee are on the same server.
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if (!$failed) {
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info(L10n::t('Your introduction has been sent.') . EOL);
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}
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// "Homecoming" - send the requestor back to their site to record the introduction.
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$dfrn_url = bin2hex($a->getBaseURL() . '/profile/' . $nickname);
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$aes_allow = ((function_exists('openssl_encrypt')) ? 1 : 0);
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System::externalRedirect($parms['dfrn-request'] . "?dfrn_url=$dfrn_url"
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. '&dfrn_version=' . DFRN_PROTOCOL_VERSION
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. '&confirm_key=' . $hash
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. (($aes_allow) ? "&aes_allow=1" : "")
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);
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// NOTREACHED
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// END $network === Protocol::DFRN
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} elseif (($network != Protocol::PHANTOM) && ($url != "")) {
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/* Substitute our user's feed URL into $url template
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* Send the subscriber home to subscribe
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*/
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// Diaspora needs the uri in the format user@domain.tld
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// Diaspora will support the remote subscription in a future version
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if ($network == Protocol::DIASPORA) {
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$uri = $nickname . '@' . $a->getHostName();
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if ($a->getURLPath()) {
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$uri .= '/' . $a->getURLPath();
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}
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$uri = urlencode($uri);
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} else {
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$uri = 'profile/' . $nickname;
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}
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$url = str_replace('{uri}', $uri, $url);
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System::externalRedirect($url);
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// NOTREACHED
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// END $network != Protocol::PHANTOM
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} else {
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notice(L10n::t("Remote subscription can't be done for your network. Please subscribe directly on your system.") . EOL);
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return;
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}
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} return;
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}
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function dfrn_request_content(App $a)
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{
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if ($a->argc != 2 || empty($a->profile)) {
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return "";
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}
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// "Homecoming". Make sure we're logged in to this site as the correct user. Then offer a confirm button
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// to send us to the post section to record the introduction.
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if (!empty($_GET['dfrn_url'])) {
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if (!local_user()) {
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info(L10n::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 */
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return Login::form();
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}
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// Edge case, but can easily happen in the wild. This person is authenticated,
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// but not as the person who needs to deal with this request.
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if ($a->user['nickname'] != $a->argv[1]) {
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notice(L10n::t("Incorrect identity currently logged in. Please login to <strong>this</strong> profile.") . EOL);
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return Login::form();
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}
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$dfrn_url = Strings::escapeTags(trim(hex2bin($_GET['dfrn_url'])));
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$aes_allow = !empty($_GET['aes_allow']);
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$confirm_key = $_GET['confirm_key'] ?? '';
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// Checking fastlane for validity
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if (!empty($_SESSION['fastlane']) && (Strings::normaliseLink($_SESSION["fastlane"]) == Strings::normaliseLink($dfrn_url))) {
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$_POST["dfrn_url"] = $dfrn_url;
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$_POST["confirm_key"] = $confirm_key;
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$_POST["localconfirm"] = 1;
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$_POST["hidden-contact"] = 0;
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$_POST["submit"] = L10n::t('Confirm');
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dfrn_request_post($a);
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exit();
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}
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$tpl = Renderer::getMarkupTemplate("dfrn_req_confirm.tpl");
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$o = Renderer::replaceMacros($tpl, [
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'$dfrn_url' => $dfrn_url,
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'$aes_allow' => (($aes_allow) ? '<input type="hidden" name="aes_allow" value="1" />' : "" ),
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'$hidethem' => L10n::t('Hide this contact'),
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'$confirm_key' => $confirm_key,
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'$welcome' => L10n::t('Welcome home %s.', $a->user['username']),
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'$please' => L10n::t('Please confirm your introduction/connection request to %s.', $dfrn_url),
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'$submit' => L10n::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']
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]);
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return $o;
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} elseif (!empty($_GET['confirm_key'])) {
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// we are the requestee and it is now safe to send our user their introduction,
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// We could just unblock it, but first we have to jump through a few hoops to
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// send an email, or even to find out if we need to send an email.
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$intro = q("SELECT * FROM `intro` WHERE `hash` = '%s' LIMIT 1",
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DBA::escape($_GET['confirm_key'])
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);
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if (DBA::isResult($intro)) {
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$r = q("SELECT `contact`.*, `user`.* FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
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WHERE `contact`.`id` = %d LIMIT 1",
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intval($intro[0]['contact-id'])
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);
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$auto_confirm = false;
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if (DBA::isResult($r)) {
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if ($r[0]['page-flags'] != User::PAGE_FLAGS_NORMAL && $r[0]['page-flags'] != User::PAGE_FLAGS_PRVGROUP) {
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$auto_confirm = true;
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}
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if (!$auto_confirm) {
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notification([
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'type' => NOTIFY_INTRO,
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'notify_flags' => $r[0]['notify-flags'],
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'language' => $r[0]['language'],
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'to_name' => $r[0]['username'],
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'to_email' => $r[0]['email'],
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'uid' => $r[0]['uid'],
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'link' => System::baseUrl() . '/notifications/intros',
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'source_name' => ((strlen(stripslashes($r[0]['name']))) ? stripslashes($r[0]['name']) : L10n::t('[Name Withheld]')),
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'source_link' => $r[0]['url'],
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'source_photo' => $r[0]['photo'],
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'verb' => ACTIVITY_REQ_FRIEND,
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'otype' => 'intro'
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]);
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}
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if ($auto_confirm) {
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require_once 'mod/dfrn_confirm.php';
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$handsfree = [
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'uid' => $r[0]['uid'],
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'node' => $r[0]['nickname'],
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'dfrn_id' => $r[0]['issued-id'],
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'intro_id' => $intro[0]['id'],
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'duplex' => (($r[0]['page-flags'] == User::PAGE_FLAGS_FREELOVE) ? 1 : 0),
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];
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dfrn_confirm_post($a, $handsfree);
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}
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}
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if (!$auto_confirm) {
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// If we are auto_confirming, this record will have already been nuked
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// in dfrn_confirm_post()
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q("UPDATE `intro` SET `blocked` = 0 WHERE `hash` = '%s'",
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DBA::escape($_GET['confirm_key'])
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);
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}
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}
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exit();
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} else {
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// Normal web request. Display our user's introduction form.
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if (Config::get('system', 'block_public') && !Session::isAuthenticated()) {
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if (!Config::get('system', 'local_block')) {
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notice(L10n::t('Public access denied.') . EOL);
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return;
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}
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}
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// Try to auto-fill the profile address
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// At first look if an address was provided
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// Otherwise take the local address
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if (!empty($_GET['addr'])) {
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$myaddr = hex2bin($_GET['addr']);
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} elseif (!empty($_GET['address'])) {
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$myaddr = $_GET['address'];
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} elseif (local_user()) {
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if (strlen($a->getURLPath())) {
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$myaddr = System::baseUrl() . '/profile/' . $a->user['nickname'];
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} else {
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$myaddr = $a->user['nickname'] . '@' . substr(System::baseUrl(), strpos(System::baseUrl(), '://') + 3);
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}
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} else {
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// last, try a zrl
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$myaddr = Profile::getMyURL();
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}
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$target_addr = $a->profile['nickname'] . '@' . substr(System::baseUrl(), strpos(System::baseUrl(), '://') + 3);
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/* The auto_request form only has the profile address
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* because nobody is going to read the comments and
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* it doesn't matter if they know you or not.
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*/
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if ($a->profile['page-flags'] == User::PAGE_FLAGS_NORMAL) {
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$tpl = Renderer::getMarkupTemplate('dfrn_request.tpl');
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} else {
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$tpl = Renderer::getMarkupTemplate('auto_request.tpl');
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}
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$page_desc = L10n::t("Please enter your 'Identity Address' from one of the following supported communications networks:");
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$invite_desc = 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');
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$o = Renderer::replaceMacros($tpl, [
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'$header' => L10n::t('Friend/Connection Request'),
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'$desc' => L10n::t('Examples: jojo@demo.friendica.com, http://demo.friendica.com/profile/jojo, testuser@gnusocial.de'),
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'$pls_answer' => L10n::t('Please answer the following:'),
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'$does_know_you' => ['knowyou', L10n::t('Does %s know you?', $a->profile['name']), false, '', [L10n::t('No'), L10n::t('Yes')]],
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'$add_note' => L10n::t('Add a personal note:'),
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'$page_desc' => $page_desc,
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'$friendica' => L10n::t('Friendica'),
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'$statusnet' => L10n::t("GNU Social \x28Pleroma, Mastodon\x29"),
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'$diaspora' => L10n::t("Diaspora \x28Socialhome, Hubzilla\x29"),
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'$diasnote' => L10n::t(' - please do not use this form. Instead, enter %s into your Diaspora search bar.', $target_addr),
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'$your_address' => L10n::t('Your Identity Address:'),
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'$invite_desc' => $invite_desc,
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'$submit' => L10n::t('Submit Request'),
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'$cancel' => L10n::t('Cancel'),
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'$nickname' => $a->argv[1],
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'$name' => $a->profile['name'],
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'$myaddr' => $myaddr
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]);
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return $o;
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}
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}
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