mod/dfrn_request.php

   1 <?php
   2
   3 /**
   4  *
   5  * Module: dfrn_request
   6  *
   7  * Purpose: Handles communication associated with the issuance of
   8  * friend requests.
   9  *
  10  */
  11
  12 if(! function_exists('dfrn_request_init')) {
  13 function dfrn_request_init(&$a) {
  14
  15         if($a->argc > 1)
  16                 $which = $a->argv[1];
  17
  18         profile_load($a,$which);
  19         return;
  20 }}
  21
  22
  23 /**
  24  * Function: dfrn_request_post
  25  *
  26  * Purpose:
  27  * Handles multiple scenarios.
  28  *
  29  * Scenario 1:
  30  * Clicking 'submit' on a friend request page.
  31  *
  32  * Scenario 2:
  33  * Following Scenario 1, we are brought back to our home site
  34  * in order to link our friend request with our own server cell.
  35  * After logging in, we click 'submit' to approve the linkage.
  36  *
  37  */
  38
  39 if(! function_exists('dfrn_request_post')) {
  40 function dfrn_request_post(&$a) {
  41
  42         if(($a->argc != 2) || (! count($a->profile)))
  43                 return;
  44
  45
  46         if($_POST['cancel']) {
  47                 goaway($a->get_baseurl());
  48         }
  49
  50
  51         /**
  52          *
  53          * Scenario 2: We've introduced ourself to another cell, then have been returned to our own cell
  54          * to confirm the request, and then we've clicked submit (perhaps after logging in).
  55          * That brings us here:
  56          *
  57          */
  58
  59         if((x($_POST,'localconfirm')) && ($_POST['localconfirm'] == 1)) {
  60
  61                 /**
  62                  * Ensure this is a valid request
  63                  */
  64
  65                 if(local_user() && ($a->user['nickname'] == $a->argv[1]) && (x($_POST,'dfrn_url'))) {
  66
  67
  68                         $dfrn_url    = notags(trim($_POST['dfrn_url']));
  69                         $aes_allow   = (((x($_POST,'aes_allow')) && ($_POST['aes_allow'] == 1)) ? 1 : 0);
  70                         $confirm_key = ((x($_POST,'confirm_key')) ? $_POST['confirm_key'] : "");
  71
  72                         $contact_record = null;
  73
  74                         if(x($dfrn_url)) {
  75
  76                                 /**
  77                                  * Lookup the contact based on their URL (which is the only unique thing we have at the moment)
  78                                  */
  79
  80                                 $r = q("SELECT * FROM `contact` WHERE `uid` = %d AND `url` = '%s' AND `self` = 0 LIMIT 1",
  81                                         intval(local_user()),
  82                                         dbesc($dfrn_url)
  83                                 );
  84
  85                                 if(count($r)) {
  86                                         if(strlen($r[0]['dfrn-id'])) {
  87
  88                                                 /**
  89                                                  * We don't need to be here. It has already happened.
  90                                                  */
  91
  92                                                 notice( t("This introduction has already been accepted.") . EOL );
  93                                                 return;
  94                                         }
  95                                         else
  96                                                 $contact_record = $r[0];
  97                                 }
  98
  99                                 if(is_array($contact_record)) {
 100                                         $r = q("UPDATE `contact` SET `ret-aes` = %d WHERE `id` = %d LIMIT 1",
 101                                                 intval($aes_allow),
 102                                                 intval($contact_record['id'])
 103                                         );
 104                                 }
 105                                 else {
 106
 107                                         /**
 108                                          * Scrape the other site's profile page to pick up the dfrn links, key, fn, and photo
 109                                          */
 110
 111                                         require_once('Scrape.php');
 112
 113                                         $parms = scrape_dfrn($dfrn_url);
 114
 115                                         if(! count($parms)) {
 116                                                 notice( t('Profile location is not valid or does not contain profile information.') . EOL );
 117                                                 return;
 118                                         }
 119                                         else {
 120                                                 if(! x($parms,'fn'))
 121                                                         notice( t('Warning: profile location has no identifiable owner name.') . EOL );
 122                                                 if(! x($parms,'photo'))
 123                                                         notice( t('Warning: profile location has no profile photo.') . EOL );
 124                                                 $invalid = validate_dfrn($parms);
 125                                                 if($invalid) {
 126                                                         notice( $invalid . t(' required parameter')
 127                                                                 . (($invalid == 1) ? t(" was ") : t("s were ") )
 128                                                                 . t("not found at the given location.") . EOL ) ;
 129                                                         return;
 130                                                 }
 131                                         }
 132
 133                                         $dfrn_request = $parms['dfrn-request'];
 134
 135                     /********* Escape the entire array ********/
 136
 137                                         dbesc_array($parms);
 138
 139                                         /******************************************/
 140
 141                                         /**
 142                                          * Create a contact record on our site for the other person
 143                                          */
 144
 145                                         $r = q("INSERT INTO `contact` ( `uid`, `created`,`url`, `name`, `nick`, `photo`, `site-pubkey`,
 146                                                 `request`, `confirm`, `notify`, `poll`, `aes_allow`)
 147                                                 VALUES ( %d, '%s', '%s', '%s' , '%s', '%s', '%s', '%s', '%s', '%s', '%s', %d)",
 148                                                 intval(local_user()),
 149                                                 datetime_convert(),
 150                                                 dbesc($dfrn_url),
 151                                                 $parms['fn'],
 152                                                 $parms['nick'],
 153                                                 $parms['photo'],
 154                                                 $parms['key'],
 155                                                 $parms['dfrn-request'],
 156                                                 $parms['dfrn-confirm'],
 157                                                 $parms['dfrn-notify'],
 158                                                 $parms['dfrn-poll'],
 159                                                 intval($aes_allow)
 160                                         );
 161                                 }
 162
 163                                 if($r) {
 164                                         notice( t("Introduction complete.") . EOL);
 165                                 }
 166
 167                                 /**
 168                                  * Allow the blocked remote notification to complete
 169                                  */
 170
 171                                 if(is_array($contact_record))
 172                                         $dfrn_request = $contact_record['request'];
 173
 174                                 if(strlen($dfrn_request) && strlen($confirm_key))
 175                                         $s = fetch_url($dfrn_request . '?confirm_key=' . $confirm_key);
 176
 177                                 // (ignore reply, nothing we can do it failed)
 178
 179                                 goaway($dfrn_url);
 180                                 return; // NOTREACHED
 181
 182                         }
 183
 184                 }
 185
 186                 // invalid/bogus request
 187
 188                 notice( t('Unrecoverable protocol error.') . EOL );
 189                 goaway($a->get_baseurl());
 190                 return; // NOTREACHED
 191         }
 192
 193         /**
 194          * Otherwise:
 195          *
 196          * Scenario 1:
 197          * We are the requestee. A person from a remote cell has made an introduction
 198          * on our profile web page and clicked submit. We will use their DFRN-URL to
 199          * figure out how to contact their cell.
 200          *
 201          * Scrape the originating DFRN-URL for everything we need. Create a contact record
 202          * and an introduction to show our user next time he/she logs in.
 203          * Finally redirect back to the requestor so that their site can record the request.
 204          * If our user (the requestee) later confirms this request, a record of it will need
 205          * to exist on the requestor's cell in order for the confirmation process to complete..
 206          *
 207          * It's possible that neither the requestor or the requestee are logged in at the moment,
 208          * and the requestor does not yet have any credentials to the requestee profile.
 209          *
 210          * Who is the requestee? We've already loaded their profile which means their nickname should be
 211          * in $a->argv[1] and we should have their complete info in $a->profile.
 212          *
 213          */
 214
 215         if(! (is_array($a->profile) && count($a->profile))) {
 216                 notice( t('Profile unavailable.') . EOL);
 217                 return;
 218         }
 219
 220         $nickname       = $a->profile['nickname'];
 221         $notify_flags   = $a->profile['notify-flags'];
 222         $uid            = $a->profile['uid'];
 223         $maxreq         = intval($a->profile['maxreq']);
 224         $contact_record = null;
 225         $failed         = false;
 226         $parms          = null;
 227
 228
 229         if( x($_POST,'dfrn_url')) {
 230
 231                 /**
 232                  * Block friend request spam
 233                  */
 234
 235                 if($maxreq) {
 236                         $r = q("SELECT * FROM `intro` WHERE `datetime` > '%s' AND `uid` = %d",
 237                                 dbesc(datetime_convert('UTC','UTC','now - 24 hours')),
 238                                 intval($uid)
 239                         );
 240                         if(count($r) > $maxreq) {
 241                                 notice( $a->profile['name'] . t(' has received too many connection requests today.') . EOL);
 242                                 notice( t('Spam protection measures have been invoked.') . EOL);
 243                                 notice( t('Friends are advised to please try again in 24 hours.') . EOL);
 244                                 return;
 245                         }
 246                 }
 247
 248                 /**
 249                  *
 250                  * Cleanup old introductions that remain blocked.
 251                  * Also remove the contact record, but only if there is no existing relationship
 252                  *
 253                  */
 254
 255                 $r = q("SELECT `intro`.*, `intro`.`id` AS `iid`, `contact`.`id` AS `cid`, `contact`.`rel`
 256                         FROM `intro` LEFT JOIN `contact` on `intro`.`contact-id` = `contact`.`id`
 257                         WHERE `intro`.`blocked` = 1 AND `contact`.`self` = 0 AND `intro`.`datetime` < UTC_TIMESTAMP() - INTERVAL 30 MINUTE ");
 258                 if(count($r)) {
 259                         foreach($r as ($rr) {
 260                                 if(! $rr['rel']) {
 261                                         q("DELETE FROM `contact` WHERE `id` = %d LIMIT 1",
 262                                                 intval($rr['cid'])
 263                                         );
 264                                 }
 265                                 q("DELETE FROM `intro` WHERE `id` = %d LIMIT 1",
 266                                         intval($rr['iid'])
 267                                 );
 268                         }
 269                 }
 270
 271                 $url = trim($_POST['dfrn_url']);
 272                 if(! strlen($url)) {
 273                         notice( t("Invalid locator") . EOL );
 274                         return;
 275                 }
 276
 277                 // Canonicalise email-style profile locator
 278
 279                 $url = webfinger_dfrn($url);
 280
 281                 if(substr($url,0,5) === 'stat:') {
 282                         $network = 'stat';
 283                         $url = substr($url,5);
 284                 }
 285                 else {
 286                         $network = 'dfrn';
 287                 }
 288
 289                 logger('dfrn_request: url: ' . $url);
 290
 291                 if(! strlen($url)) {
 292                         notice( t("Unable to resolve your name at the provided location.") . EOL);
 293                         return;
 294                 }
 295
 296
 297                 if($network === 'dfrn') {
 298                         $ret = q("SELECT * FROM `contact` WHERE `uid` = %d AND `url` = '%s' AND `self` = 0 LIMIT 1",
 299                                 intval($uid),
 300                                 dbesc($url)
 301                         );
 302
 303                         if(count($ret)) {
 304                                 if(strlen($ret[0]['issued-id'])) {
 305                                         notice( t('You have already introduced yourself here.') . EOL );
 306                                         return;
 307                                 }
 308                                 elseif($ret[0]['rel'] == REL_BUD) {
 309                                         notice( t('Apparently you are already friends with .') . $a->profile['name'] . EOL);
 310                                         return;
 311                                 }
 312                                 else {
 313                                         $contact_record = $ret[0];
 314                                         $parms = array('dfrn-request' => $ret[0]['request']);
 315                                 }
 316                         }
 317
 318                         $issued_id = random_string();
 319
 320                         if(is_array($contact_record)) {
 321                                 // There is a contact record but no issued-id, so this
 322                                 // is a reciprocal introduction from a known contact
 323                                 $r = q("UPDATE `contact` SET `issued-id` = '%s' WHERE `id` = %d LIMIT 1",
 324                                         dbesc($issued_id),
 325                                         intval($contact_record['id'])
 326                                 );
 327                         }
 328                         else {
 329                                 if(! validate_url($url)) {
 330                                         notice( t('Invalid profile URL.') . EOL);
 331                                         goaway($a->get_baseurl() . '/' . $a->cmd);
 332                                         return; // NOTREACHED
 333                                 }
 334
 335                                 if(! allowed_url($url)) {
 336                                         notice( t('Disallowed profile URL.') . EOL);
 337                                         goaway($a->get_baseurl() . '/' . $a->cmd);
 338                                         return; // NOTREACHED
 339                                 }
 340
 341
 342                                 require_once('Scrape.php');
 343
 344                                 $parms = scrape_dfrn($url);
 345
 346                                 if(! count($parms)) {
 347                                         notice( t('Profile location is not valid or does not contain profile information.') . EOL );
 348                                         goaway($a->get_baseurl() . '/' . $a->cmd);
 349                                 }
 350                                 else {
 351                                         if(! x($parms,'fn'))
 352                                                 notice( t('Warning: profile location has no identifiable owner name.') . EOL );
 353                                         if(! x($parms,'photo'))
 354                                                 notice( t('Warning: profile location has no profile photo.') . EOL );
 355                                         $invalid = validate_dfrn($parms);
 356                                         if($invalid) {
 357                                                 notice( $invalid . t(' required parameter')
 358                                                         . (($invalid == 1) ? t(" was ") : t("s were ") )
 359                                                         . t("not found at the given location.") . EOL ) ;
 360
 361                                                 return;
 362                                         }
 363                                 }
 364
 365
 366                                 $parms['url'] = $url;
 367                                 $parms['issued-id'] = $issued_id;
 368
 369
 370                                 dbesc_array($parms);
 371                                 $r = q("INSERT INTO `contact` ( `uid`, `created`, `url`, `name`, `nick`, `issued-id`, `photo`, `site-pubkey`,
 372                                         `request`, `confirm`, `notify`, `poll` )
 373                                         VALUES ( %d, '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s' )",
 374                                         intval($uid),
 375                                         datetime_convert(),
 376                                         $parms['url'],
 377                                         $parms['fn'],
 378                                         $parms['nick'],
 379                                         $parms['issued-id'],
 380                                         $parms['photo'],
 381                                         $parms['key'],
 382                                         $parms['dfrn-request'],
 383                                         $parms['dfrn-confirm'],
 384                                         $parms['dfrn-notify'],
 385                                         $parms['dfrn-poll']
 386                                 );
 387
 388                                 // find the contact record we just created
 389                                 if($r) {
 390                                         $r = q("SELECT `id` FROM `contact`
 391                                                 WHERE `uid` = %d AND `url` = '%s' AND `issued-id` = '%s' LIMIT 1",
 392                                                 intval($uid),
 393                                                 $parms['url'],
 394                                                 $parms['issued-id']
 395                                         );
 396                                         if(count($r))
 397                                                 $contact_record = $r[0];
 398                                 }
 399
 400                         }
 401                         if($r === false) {
 402                                 notice( t('Failed to update contact record.') . EOL );
 403                                 return;
 404                         }
 405
 406                         $hash = random_string() . (string) time();   // Generate a confirm_key
 407
 408                         if(is_array($contact_record)) {
 409                                 $ret = q("INSERT INTO `intro` ( `uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime`)
 410                                         VALUES ( %d, %d, 1, %d, '%s', '%s', '%s' )",
 411                                         intval($uid),
 412                                         intval($contact_record['id']),
 413                                         ((x($_POST,'knowyou') && ($_POST['knowyou'] == 1)) ? 1 : 0),
 414                                         dbesc(notags(trim($_POST['dfrn-request-message']))),
 415                                         dbesc($hash),
 416                                         dbesc(datetime_convert())
 417                                 );
 418                         }
 419
 420                         // This notice will only be seen by the requestor if the requestor and requestee are on the same server.
 421
 422                         if(! $failed)
 423                                 notice( t('Your introduction has been sent.') . EOL );
 424
 425                         // "Homecoming" - send the requestor back to their site to record the introduction.
 426
 427                         $dfrn_url = bin2hex($a->get_baseurl() . '/profile/' . $nickname);
 428                         $aes_allow = ((function_exists('openssl_encrypt')) ? 1 : 0);
 429
 430                         goaway($parms['dfrn-request'] . "?dfrn_url=$dfrn_url"
 431                                 . '&dfrn_version=' . DFRN_PROTOCOL_VERSION
 432                                 . '&confirm_key='  . $hash
 433                                 . (($aes_allow) ? "&aes_allow=1" : "")
 434                         );
 435                         // NOTREACHED
 436                         // END $network === 'dfrn'
 437                 }
 438                 elseif($network === 'stat') {
 439
 440                         /**
 441                          *
 442                          * OStatus network
 443                          * Check contact existence
 444                          * Try and scrape together enough information to create a contact record, with us as REL_VIP
 445                          * Substitute our user's feed URL into $url template
 446                          * Send the subscriber home to subscribe
 447                          *
 448                          */
 449
 450                         $url = str_replace('{uri}', $a->get_baseurl() . '/dfrn_poll/' . $nickname, $url);
 451                         goaway($url);
 452                         // NOTREACHED
 453                         // END $network === 'stat'
 454                 }
 455
 456         }       return;
 457 }}
 458
 459
 460
 461
 462 if(! function_exists('dfrn_request_content')) {
 463 function dfrn_request_content(&$a) {
 464
 465
 466
 467         if(($a->argc != 2) || (! count($a->profile)))
 468                 return "";
 469
 470
 471         // "Homecoming". Make sure we're logged in to this site as the correct user. Then offer a confirm button
 472         // to send us to the post section to record the introduction.
 473
 474         if(x($_GET,'dfrn_url')) {
 475
 476                 if(! local_user()) {
 477                         notice( t("Please login to confirm introduction.") . EOL );
 478
 479                         /* setup the return URL to come back to this page if they use openid */
 480
 481                         $stripped = str_replace('q=','',$a->query_string);
 482                         $_SESSION['return_url'] = trim($stripped,'/');
 483
 484                         return login();
 485                 }
 486
 487                 // Edge case, but can easily happen in the wild. This person is authenticated,
 488                 // but not as the person who needs to deal with this request.
 489
 490                 if ($a->user['nickname'] != $a->argv[1]) {
 491                         notice( t("Incorrect identity currently logged in. Please login to <strong>this</strong> profile.") . EOL);
 492                         return login();
 493                 }
 494
 495                 $dfrn_url = notags(trim(hex2bin($_GET['dfrn_url'])));
 496                 $aes_allow = (((x($_GET,'aes_allow')) && ($_GET['aes_allow'] == 1)) ? 1 : 0);
 497                 $confirm_key = (x($_GET,'confirm_key') ? $_GET['confirm_key'] : "");
 498                 $o .= load_view_file("view/dfrn_req_confirm.tpl");
 499                 $o  = replace_macros($o,array(
 500                         '$dfrn_url' => $dfrn_url,
 501                         '$aes_allow' => (($aes_allow) ? '<input type="hidden" name="aes_allow" value="1" />' : "" ),
 502                         '$confirm_key' => $confirm_key,
 503                         '$username' => $a->user['username'],
 504                         '$uid' => $_SESSION['uid'],
 505                         '$nickname' => $a->user['nickname'],
 506                         'dfrn_rawurl' => $_GET['dfrn_url']
 507                         ));
 508                 return $o;
 509
 510         }
 511         elseif((x($_GET,'confirm_key')) && strlen($_GET['confirm_key'])) {
 512
 513                 // we are the requestee and it is now safe to send our user their introduction,
 514                 // We could just unblock it, but first we have to jump through a few hoops to
 515                 // send an email, or even to find out if we need to send an email.
 516
 517                 $intro = q("SELECT * FROM `intro` WHERE `hash` = '%s' LIMIT 1",
 518                         dbesc($_GET['confirm_key'])
 519                 );
 520
 521                 if(count($intro)) {
 522
 523                         $r = q("SELECT `contact`.*, `user`.* FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
 524                                 WHERE `contact`.`id` = %d LIMIT 1",
 525                                 intval($intro[0]['contact-id'])
 526                         );
 527
 528                         $auto_confirm = false;
 529
 530                         if(count($r)) {
 531                                 if($r[0]['page-flags'] != PAGE_NORMAL)
 532                                         $auto_confirm = true;
 533                                 if(($r[0]['notify-flags'] & NOTIFY_INTRO) && (! $auto_confirm)) {
 534                                         $email_tpl = load_view_file('view/request_notify_eml.tpl');
 535                                         $email = replace_macros($email_tpl, array(
 536                                                 '$requestor' => ((strlen(stripslashes($r[0]['name']))) ? stripslashes($r[0]['name']) : t('[Name Withheld]')),
 537                                                 '$url' => stripslashes($r[0]['url']),
 538                                                 '$myname' => $r[0]['username'],
 539                                                 '$siteurl' => $a->get_baseurl(),
 540                                                 '$sitename' => $a->config['sitename']
 541                                         ));
 542                                         $res = mail($r[0]['email'],
 543                                                 t("Introduction received at ") . $a->config['sitename'],
 544                                                 $email,
 545                                                 'From: ' . t('Administrator') . '@' . $_SERVER['SERVER_NAME'] );
 546                                         // This is a redundant notification - no point throwing errors if it fails.
 547                                 }
 548                                 if($auto_confirm) {
 549                                         require_once('mod/dfrn_confirm.php');
 550                                         $handsfree = array(
 551                                                 'uid' => $r[0]['uid'],
 552                                                 'node' => $r[0]['nickname'],
 553                                                 'dfrn_id' => $r[0]['issued-id'],
 554                                                 'intro_id' => $intro[0]['id'],
 555                                                 'duplex' => (($r[0]['page-flags'] == PAGE_FREELOVE) ? 1 : 0)
 556                                         );
 557                                         dfrn_confirm_post($a,$handsfree);
 558                                 }
 559
 560                         }
 561
 562                         if(! $auto_confirm) {
 563
 564                                 // If we are auto_confirming, this record will have already been nuked
 565                                 // in dfrn_confirm_post()
 566
 567                                 $r = q("UPDATE `intro` SET `blocked` = 0 WHERE `hash` = '%s' LIMIT 1",
 568                                         dbesc($_GET['confirm_key'])
 569                                 );
 570                         }
 571                 }
 572                 killme();
 573                 return; // NOTREACHED
 574         }
 575         else {
 576
 577                 /**
 578                  * Normal web request. Display our user's introduction form.
 579                  */
 580
 581                 /**
 582                  * Try to auto-fill the profile address
 583                  */
 584
 585                 if(local_user()) {
 586                         if(strlen($a->path)) {
 587                                 $myaddr = $a->get_baseurl() . '/profile/' . $a->user['nickname'];
 588                         }
 589                         else {
 590                                 $myaddr = $a->user['nickname'] . '@' . substr($a->get_baseurl(), strpos($a->get_baseurl(),'://') + 3 );
 591                         }
 592                 }
 593                 else {
 594                         $myaddr = ((x($_GET,'address')) ? urldecode($_GET['address']) : '');
 595                 }
 596
 597                 /**
 598                  *
 599                  * The auto_request form only has the profile address
 600                  * because nobody is going to read the comments and
 601                  * it doesn't matter if they know you or not.
 602                  *
 603                  */
 604
 605                 if($a->profile['page-flags'] == PAGE_NORMAL)
 606                         $tpl = load_view_file('view/dfrn_request.tpl');
 607                 else
 608                         $tpl = load_view_file('view/auto_request.tpl');
 609
 610                 $o .= replace_macros($tpl,array(
 611                         '$header' => t('Friend/Connection Request'),
 612                         '$pls_answer' => t('Please answer the following:'),
 613                         '$does_know' => t('Does $name know you?'),
 614                         '$yes' => t('Yes'),
 615                         '$no' => t('No'),
 616                         '$add_note' => t('Add a personal note:'),
 617                         '$page_desc' => t('Please enter your profile address from one of the following supported social networks:'),
 618                         '$friendika' => t('Friendika'),
 619                         '$statusnet' => t('StatusNet/Federated Social Web'),
 620                         '$private_net' => t("Private \x28secure\x29 network"),
 621                         '$public_net' => t("Public \x28insecure\x29 network"),
 622                         '$your_address' => t('Your profile address:'),
 623                         '$submit' => t('Submit Request'),
 624                         '$cancel' => t('Cancel'),
 625                         '$nickname' => $a->argv[1],
 626                         '$name' => $a->profile['name'],
 627                         '$myaddr' => $myaddr
 628                 ));
 629                 return $o;
 630         }
 631
 632         return; // Somebody is fishing.
 633 }}