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                 $url = trim($_POST['dfrn_url']);
 249                 if(! strlen($url)) {
 250                         notice( t("Invalid locator") . EOL );
 251                         return;
 252                 }
 253
 254                 // Canonicalise email-style profile locator
 255
 256                 $url = webfinger_dfrn($url);
 257
 258                 if(substr($url,0,5) === 'stat:') {
 259                         $network = 'stat';
 260                         $url = substr($url,5);
 261                 }
 262                 else {
 263                         $network = 'dfrn';
 264                 }
 265
 266                 logger('dfrn_request: url: ' . $url);
 267
 268                 if(! strlen($url)) {
 269                         notice( t("Unable to resolve your name at the provided location.") . EOL);
 270                         return;
 271                 }
 272
 273
 274                 if($network === 'dfrn') {
 275                         $ret = q("SELECT * FROM `contact` WHERE `uid` = %d AND `url` = '%s' AND `self` = 0 LIMIT 1",
 276                                 intval($uid),
 277                                 dbesc($url)
 278                         );
 279
 280                         if(count($ret)) {
 281                                 if(strlen($ret[0]['issued-id'])) {
 282                                         notice( t('You have already introduced yourself here.') . EOL );
 283                                         return;
 284                                 }
 285                                 elseif($ret[0]['rel'] == REL_BUD) {
 286                                         notice( t('Apparently you are already friends with .') . $a->profile['name'] . EOL);
 287                                         return;
 288                                 }
 289                                 else {
 290                                         $contact_record = $ret[0];
 291                                         $parms = array('dfrn-request' => $ret[0]['request']);
 292                                 }
 293                         }
 294
 295                         $issued_id = random_string();
 296
 297                         if(is_array($contact_record)) {
 298                                 // There is a contact record but no issued-id, so this
 299                                 // is a reciprocal introduction from a known contact
 300                                 $r = q("UPDATE `contact` SET `issued-id` = '%s' WHERE `id` = %d LIMIT 1",
 301                                         dbesc($issued_id),
 302                                         intval($contact_record['id'])
 303                                 );
 304                         }
 305                         else {
 306                                 if(! validate_url($url)) {
 307                                         notice( t('Invalid profile URL.') . EOL);
 308                                         goaway($a->get_baseurl() . '/' . $a->cmd);
 309                                         return; // NOTREACHED
 310                                 }
 311
 312                                 if(! allowed_url($url)) {
 313                                         notice( t('Disallowed profile URL.') . EOL);
 314                                         goaway($a->get_baseurl() . '/' . $a->cmd);
 315                                         return; // NOTREACHED
 316                                 }
 317
 318
 319                                 require_once('Scrape.php');
 320
 321                                 $parms = scrape_dfrn($url);
 322
 323                                 if(! count($parms)) {
 324                                         notice( t('Profile location is not valid or does not contain profile information.') . EOL );
 325                                         goaway($a->get_baseurl() . '/' . $a->cmd);
 326                                 }
 327                                 else {
 328                                         if(! x($parms,'fn'))
 329                                                 notice( t('Warning: profile location has no identifiable owner name.') . EOL );
 330                                         if(! x($parms,'photo'))
 331                                                 notice( t('Warning: profile location has no profile photo.') . EOL );
 332                                         $invalid = validate_dfrn($parms);
 333                                         if($invalid) {
 334                                                 notice( $invalid . t(' required parameter')
 335                                                         . (($invalid == 1) ? t(" was ") : t("s were ") )
 336                                                         . t("not found at the given location.") . EOL ) ;
 337
 338                                                 return;
 339                                         }
 340                                 }
 341
 342
 343                                 $parms['url'] = $url;
 344                                 $parms['issued-id'] = $issued_id;
 345
 346
 347                                 dbesc_array($parms);
 348                                 $r = q("INSERT INTO `contact` ( `uid`, `created`, `url`, `name`, `nick`, `issued-id`, `photo`, `site-pubkey`,
 349                                         `request`, `confirm`, `notify`, `poll` )
 350                                         VALUES ( %d, '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s' )",
 351                                         intval($uid),
 352                                         datetime_convert(),
 353                                         $parms['url'],
 354                                         $parms['fn'],
 355                                         $parms['nick'],
 356                                         $parms['issued-id'],
 357                                         $parms['photo'],
 358                                         $parms['key'],
 359                                         $parms['dfrn-request'],
 360                                         $parms['dfrn-confirm'],
 361                                         $parms['dfrn-notify'],
 362                                         $parms['dfrn-poll']
 363                                 );
 364
 365                                 // find the contact record we just created
 366                                 if($r) {
 367                                         $r = q("SELECT `id` FROM `contact`
 368                                                 WHERE `uid` = %d AND `url` = '%s' AND `issued-id` = '%s' LIMIT 1",
 369                                                 intval($uid),
 370                                                 $parms['url'],
 371                                                 $parms['issued-id']
 372                                         );
 373                                         if(count($r))
 374                                                 $contact_record = $r[0];
 375                                 }
 376
 377                         }
 378                         if($r === false) {
 379                                 notice( t('Failed to update contact record.') . EOL );
 380                                 return;
 381                         }
 382
 383                         $hash = random_string() . (string) time();   // Generate a confirm_key
 384
 385                         if(is_array($contact_record)) {
 386                                 $ret = q("INSERT INTO `intro` ( `uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime`)
 387                                         VALUES ( %d, %d, 1, %d, '%s', '%s', '%s' )",
 388                                         intval($uid),
 389                                         intval($contact_record['id']),
 390                                         ((x($_POST,'knowyou') && ($_POST['knowyou'] == 1)) ? 1 : 0),
 391                                         dbesc(notags(trim($_POST['dfrn-request-message']))),
 392                                         dbesc($hash),
 393                                         dbesc(datetime_convert())
 394                                 );
 395                         }
 396
 397                         // This notice will only be seen by the requestor if the requestor and requestee are on the same server.
 398
 399                         if(! $failed)
 400                                 notice( t('Your introduction has been sent.') . EOL );
 401
 402                         // "Homecoming" - send the requestor back to their site to record the introduction.
 403
 404                         $dfrn_url = bin2hex($a->get_baseurl() . '/profile/' . $nickname);
 405                         $aes_allow = ((function_exists('openssl_encrypt')) ? 1 : 0);
 406
 407                         goaway($parms['dfrn-request'] . "?dfrn_url=$dfrn_url"
 408                                 . '&dfrn_version=' . DFRN_PROTOCOL_VERSION
 409                                 . '&confirm_key='  . $hash
 410                                 . (($aes_allow) ? "&aes_allow=1" : "")
 411                         );
 412                         // NOTREACHED
 413                         // END $network === 'dfrn'
 414                 }
 415                 elseif($network === 'stat') {
 416
 417                         /**
 418                          *
 419                          * OStatus network
 420                          * Check contact existence
 421                          * Try and scrape together enough information to create a contact record, with us as REL_VIP
 422                          * Substitute our user's feed URL into $url template
 423                          * Send the subscriber home to subscribe
 424                          *
 425                          */
 426
 427                         $url = str_replace('{uri}', $a->get_baseurl() . '/dfrn_poll/' . $nickname, $url);
 428                         goaway($url);
 429                         // NOTREACHED
 430                         // END $network === 'stat'
 431                 }
 432
 433         }       return;
 434 }}
 435
 436
 437
 438
 439 if(! function_exists('dfrn_request_content')) {
 440 function dfrn_request_content(&$a) {
 441
 442
 443
 444         if(($a->argc != 2) || (! count($a->profile)))
 445                 return "";
 446
 447
 448         // "Homecoming". Make sure we're logged in to this site as the correct user. Then offer a confirm button
 449         // to send us to the post section to record the introduction.
 450
 451         if(x($_GET,'dfrn_url')) {
 452
 453                 if(! local_user()) {
 454                         notice( t("Please login to confirm introduction.") . EOL );
 455                         return login();
 456                 }
 457
 458                 // Edge case, but can easily happen in the wild. This person is authenticated,
 459                 // but not as the person who needs to deal with this request.
 460
 461                 if ($a->user['nickname'] != $a->argv[1]) {
 462                         notice( t("Incorrect identity currently logged in. Please login to <strong>this</strong> profile.") . EOL);
 463                         return login();
 464                 }
 465
 466                 $dfrn_url = notags(trim(hex2bin($_GET['dfrn_url'])));
 467                 $aes_allow = (((x($_GET,'aes_allow')) && ($_GET['aes_allow'] == 1)) ? 1 : 0);
 468                 $confirm_key = (x($_GET,'confirm_key') ? $_GET['confirm_key'] : "");
 469                 $o .= load_view_file("view/dfrn_req_confirm.tpl");
 470                 $o  = replace_macros($o,array(
 471                         '$dfrn_url' => $dfrn_url,
 472                         '$aes_allow' => (($aes_allow) ? '<input type="hidden" name="aes_allow" value="1" />' : "" ),
 473                         '$confirm_key' => $confirm_key,
 474                         '$username' => $a->user['username'],
 475                         '$uid' => $_SESSION['uid'],
 476                         '$nickname' => $a->user['nickname'],
 477                         'dfrn_rawurl' => $_GET['dfrn_url']
 478                         ));
 479                 return $o;
 480
 481         }
 482         elseif((x($_GET,'confirm_key')) && strlen($_GET['confirm_key'])) {
 483
 484                 // we are the requestee and it is now safe to send our user their introduction,
 485                 // We could just unblock it, but first we have to jump through a few hoops to
 486                 // send an email, or even to find out if we need to send an email.
 487
 488                 $intro = q("SELECT * FROM `intro` WHERE `hash` = '%s' LIMIT 1",
 489                         dbesc($_GET['confirm_key'])
 490                 );
 491
 492                 if(count($intro)) {
 493
 494                         $r = q("SELECT `contact`.*, `user`.* FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
 495                                 WHERE `contact`.`id` = %d LIMIT 1",
 496                                 intval($intro[0]['contact-id'])
 497                         );
 498
 499                         $auto_confirm = false;
 500
 501                         if(count($r)) {
 502                                 if($r[0]['page-flags'] != PAGE_NORMAL)
 503                                         $auto_confirm = true;
 504                                 if(($r[0]['notify-flags'] & NOTIFY_INTRO) && (! $auto_confirm)) {
 505                                         $email_tpl = load_view_file('view/request_notify_eml.tpl');
 506                                         $email = replace_macros($email_tpl, array(
 507                                                 '$requestor' => ((strlen(stripslashes($r[0]['name']))) ? stripslashes($r[0]['name']) : t('[Name Withheld]')),
 508                                                 '$url' => stripslashes($r[0]['url']),
 509                                                 '$myname' => $r[0]['username'],
 510                                                 '$siteurl' => $a->get_baseurl(),
 511                                                 '$sitename' => $a->config['sitename']
 512                                         ));
 513                                         $res = mail($r[0]['email'],
 514                                                 t("Introduction received at ") . $a->config['sitename'],
 515                                                 $email,
 516                                                 'From: ' . t('Administrator') . '@' . $_SERVER['SERVER_NAME'] );
 517                                         // This is a redundant notification - no point throwing errors if it fails.
 518                                 }
 519                                 if($auto_confirm) {
 520                                         require_once('mod/dfrn_confirm.php');
 521                                         $handsfree = array(
 522                                                 'uid' => $r[0]['uid'],
 523                                                 'node' => $r[0]['nickname'],
 524                                                 'dfrn_id' => $r[0]['issued-id'],
 525                                                 'intro_id' => $intro[0]['id'],
 526                                                 'duplex' => (($r[0]['page-flags'] == PAGE_FREELOVE) ? 1 : 0)
 527                                         );
 528                                         dfrn_confirm_post($a,$handsfree);
 529                                 }
 530
 531                         }
 532
 533                         if(! $auto_confirm) {
 534
 535                                 // If we are auto_confirming, this record will have already been nuked
 536                                 // in dfrn_confirm_post()
 537
 538                                 $r = q("UPDATE `intro` SET `blocked` = 0 WHERE `hash` = '%s' LIMIT 1",
 539                                         dbesc($_GET['confirm_key'])
 540                                 );
 541                         }
 542                 }
 543                 killme();
 544                 return; // NOTREACHED
 545         }
 546         else {
 547
 548                 /**
 549                  * Normal web request. Display our user's introduction form.
 550                  */
 551
 552                 /**
 553                  * Try to auto-fill the profile address
 554                  */
 555
 556                 if(local_user()) {
 557                         if(strlen($a->path)) {
 558                                 $myaddr = $a->get_baseurl() . '/profile/' . $a->user['nickname'];
 559                         }
 560                         else {
 561                                 $myaddr = $a->user['nickname'] . '@' . substr($a->get_baseurl(), strpos($a->get_baseurl(),'://') + 3 );
 562                         }
 563                 }
 564                 else {
 565                         $myaddr = ((x($_GET,'address')) ? urldecode($_GET['address']) : '');
 566                 }
 567
 568                 /**
 569                  *
 570                  * The auto_request form only has the profile address
 571                  * because nobody is going to read the comments and
 572                  * it doesn't matter if they know you or not.
 573                  *
 574                  */
 575
 576                 if($a->profile['page-flags'] == PAGE_NORMAL)
 577                         $tpl = load_view_file('view/dfrn_request.tpl');
 578                 else
 579                         $tpl = load_view_file('view/auto_request.tpl');
 580
 581                 $o .= replace_macros($tpl,array(
 582                         '$header' => t('Friend/Connection Request'),
 583                         '$pls_answer' => t('Please answer the following:'),
 584                         '$does_know' => t('Does $name know you?'),
 585                         '$yes' => t('Yes'),
 586                         '$no' => t('No'),
 587                         '$add_note' => t('Add a personal note:'),
 588                         '$page_desc' => t('Please enter your profile address from one of the following supported social networks:'),
 589                         '$friendika' => t('Friendika'),
 590                         '$statusnet' => t('StatusNet/Federated Social Web'),
 591                         '$private_net' => t("Private \x28secure\x29 network"),
 592                         '$public_net' => t("Public \x28insecure\x29 network"),
 593                         '$your_address' => t('Your profile address:'),
 594                         '$submit' => t('Submit Request'),
 595                         '$cancel' => t('Cancel'),
 596                         '$nickname' => $a->argv[1],
 597                         '$name' => $a->profile['name'],
 598                         '$myaddr' => $myaddr
 599                 ));
 600                 return $o;
 601         }
 602
 603         return; // Somebody is fishing.
 604 }}