jappixmini/jappixmini.php

   1 <?php
   2
   3
   4 /**
   5 * Name: jappixmini
   6 * Description: Inserts a jabber chat
   7 * Version: 1.0
   8 * Author: leberwurscht
   9 *
  10 */
  11
  12 /*
  13
  14 Problem:
  15 * jabber password should not be stored on server
  16 * jabber password should not be sent between server and browser as soon as the user is logged in
  17 * jabber password should not be reconstructible from communication between server and browser as soon as the user is logged in
  18
  19 Solution:
  20 Only store an encrypted version of the jabber password on the server. The encryption key is only available to the browser
  21 and not to the server (at least as soon as the user is logged in). It can be stored using the jappix setDB function.
  22
  23 This encryption key could be the friendica password, but then this password would be stored in the browser in cleartext.
  24 It is better to use a hash of the password.
  25 The server should not be able to reconstruct the password, so we can't take the same hash the server stores. But we can
  26  use hash("some_prefix"+password). This will however not work with OpenID logins, for this type of login the password must
  27 be queried manually.
  28
  29 Problem:
  30 How to discover the jabber addresses of the friendica contacts?
  31
  32 Solution:
  33 Each Friendica site with this addon provides a /jappixmini/ module page. We go through our contacts and retrieve
  34 this information every week using a cron hook.
  35
  36 Problem:
  37 We do not want to make the jabber address public.
  38
  39 Solution:
  40 When two friendica users connect using DFRN, the relation gets a DFRN ID and a keypair is generated.
  41 Using this keypair, we can provide the jabber address only to contacts:
  42
  43 Alice:
  44   signed_address = openssl_*_encrypt(alice_jabber_address)
  45 send signed_address to Bob, who does
  46   trusted_address = openssl_*_decrypt(signed_address)
  47   save trusted_address
  48   encrypted_address = openssl_*_encrypt(bob_jabber_address)
  49 reply with encrypted_address to Alice, who does
  50   decrypted_address = openssl_*_decrypt(encrypted_address)
  51   save decrypted_address
  52
  53 Interface for this:
  54 GET /jappixmini/?role=%s&signed_address=%s&dfrn_id=%s
  55
  56 Response:
  57 json({"status":"ok", "encrypted_address":"%s"})
  58
  59 */
  60
  61 function jappixmini_install() {
  62 register_hook('plugin_settings', 'addon/jappixmini/jappixmini.php', 'jappixmini_settings');
  63 register_hook('plugin_settings_post', 'addon/jappixmini/jappixmini.php', 'jappixmini_settings_post');
  64
  65 register_hook('page_end', 'addon/jappixmini/jappixmini.php', 'jappixmini_script');
  66 register_hook('authenticate', 'addon/jappixmini/jappixmini.php', 'jappixmini_login');
  67
  68 register_hook('cron', 'addon/jappixmini/jappixmini.php', 'jappixmini_cron');
  69
  70 // Jappix source download as required by AGPL
  71 register_hook('about_hook', 'addon/jappixmini/jappixmini.php', 'jappixmini_download_source');
  72 }
  73
  74
  75 function jappixmini_uninstall() {
  76 unregister_hook('plugin_settings', 'addon/jappixmini/jappixmini.php', 'jappixmini_settings');
  77 unregister_hook('plugin_settings_post', 'addon/jappixmini/jappixmini.php', 'jappixmini_settings_post');
  78
  79 unregister_hook('page_end', 'addon/jappixmini/jappixmini.php', 'jappixmini_script');
  80 unregister_hook('authenticate', 'addon/jappixmini/jappixmini.php', 'jappixmini_login');
  81
  82 unregister_hook('cron', 'addon/jappixmini/jappixmini.php', 'jappixmini_cron');
  83
  84 unregister_hook('about_hook', 'addon/jappixmini/jappixmini.php', 'jappixmini_download_source');
  85 }
  86
  87 function jappixmini_plugin_admin(&$a, &$o) {
  88         // display instructions and warnings on addon settings page for admin
  89
  90         if (!file_exists("addon/jappixmini/jappix")) {
  91                 $o .= '<p><strong>You need to install the Jappix application, adapted for Friendica (see README).</strong></p>';
  92         }
  93         else if (!file_exists("addon/jappixmini/jappix.zip")) {
  94                 $o .= '<p><strong style="color:#fff;background-color:#f00">The source archive jappix.zip does not exist. This is probably a violation of the Jappix License (see README).</strong></p>';
  95         }
  96         else {
  97                 $o .= '<p>Jappix is installed.</p>';
  98         }
  99 }
 100
 101 function jappixmini_plugin_admin_post(&$a) {
 102 }
 103
 104 function jappixmini_module() {}
 105 function jappixmini_init(&$a) {
 106         // module page where other Friendica sites can submit Jabber addresses to and also can query Jabber addresses
 107         // of local users
 108
 109         if (!file_exists("addon/jappixmini/jappix")) killme();
 110
 111         $dfrn_id = $_REQUEST["dfrn_id"];
 112         if (!$dfrn_id) killme();
 113
 114         $role = $_REQUEST["role"];
 115         if ($role=="pub") {
 116                 $r = q("SELECT * FROM `contact` WHERE LENGTH(`pubkey`) AND `dfrn-id`='%s' LIMIT 1",
 117                         dbesc($dfrn_id)
 118                 );
 119                 if (!count($r)) killme();
 120
 121                 $encrypt_func = openssl_public_encrypt;
 122                 $decrypt_func = openssl_public_decrypt;
 123                 $key = $r[0]["pubkey"];
 124         } else if ($role=="prv") {
 125                 $r = q("SELECT * FROM `contact` WHERE LENGTH(`prvkey`) AND `issued-id`='%s' LIMIT 1",
 126                         dbesc($dfrn_id)
 127                 );
 128                 if (!count($r)) killme();
 129
 130                 $encrypt_func = openssl_private_encrypt;
 131                 $decrypt_func = openssl_private_decrypt;
 132                 $key = $r[0]["prvkey"];
 133         } else {
 134                 killme();
 135         }
 136
 137         $uid = $r[0]["uid"];
 138
 139         // save the Jabber address we received
 140         try {
 141                 $signed_address_hex = $_REQUEST["signed_address"];
 142                 $signed_address = hex2bin($signed_address_hex);
 143
 144                 $trusted_address = "";
 145                 $decrypt_func($signed_address, $trusted_address, $key);
 146
 147                 $now = intval(time());
 148                 set_pconfig($uid, "jappixmini", "id:$dfrn_id", "$now:$trusted_address");
 149         } catch (Exception $e) {
 150         }
 151
 152         // return the requested Jabber address
 153         try {
 154                 $username = get_pconfig($uid, 'jappixmini', 'username');
 155                 $server = get_pconfig($uid, 'jappixmini', 'server');
 156                 $address = "$username@$server";
 157
 158                 $encrypted_address = "";
 159                 $encrypt_func($address, $encrypted_address, $key);
 160
 161                 $encrypted_address_hex = bin2hex($encrypted_address);
 162
 163                 $answer = Array(
 164                         "status"=>"ok",
 165                         "encrypted_address"=>$encrypted_address_hex
 166                 );
 167
 168                 $answer_json = json_encode($answer);
 169                 echo $answer_json;
 170                 killme();
 171         } catch (Exception $e) {
 172                 killme();
 173         }
 174 }
 175
 176 function jappixmini_settings(&$a, &$s) {
 177     // addon settings for a user
 178
 179     if (!file_exists("addon/jappixmini/jappix")) return;
 180
 181     $activate = get_pconfig(local_user(),'jappixmini','activate');
 182     $activate = intval($activate) ? ' checked="checked"' : '';
 183
 184     $username = get_pconfig(local_user(),'jappixmini','username');
 185     $username = htmlentities($username);
 186     $server = get_pconfig(local_user(),'jappixmini','server');
 187     $server = htmlentities($server);
 188     $bosh = get_pconfig(local_user(),'jappixmini','bosh');
 189     $bosh = htmlentities($bosh);
 190     $password = get_pconfig(local_user(),'jappixmini','password');
 191     $autosubscribe = get_pconfig(local_user(),'jappixmini','autosubscribe');
 192     $autosubscribe = intval($autosubscribe) ? ' checked="checked"' : '';
 193     $autoapprove = get_pconfig(local_user(),'jappixmini','autoapprove');
 194     $autoapprove = intval($autoapprove) ? ' checked="checked"' : '';
 195     $encrypt = intval(get_pconfig(local_user(),'jappixmini','encrypt'));
 196     $encrypt_checked = $encrypt ? ' checked="checked"' : '';
 197     $encrypt_disabled = $encrypt ? '' : ' disabled="disabled"';
 198
 199     if (!$activate) {
 200         // load scripts if not yet activated so that password can be saved
 201         $a->page['htmlhead'] .= '<script type="text/javascript" src="' . $a->get_baseurl() . '/addon/jappixmini/jappix/php/get.php?t=js&amp;g=mini.xml"></script>'."\r\n";
 202         $a->page['htmlhead'] .= '<script type="text/javascript" src="' . $a->get_baseurl() . '/addon/jappixmini/jappix/php/get.php?t=js&amp;f=presence.js"></script>'."\r\n";
 203
 204         $a->page['htmlhead'] .= '<script type="text/javascript" src="' . $a->get_baseurl() . '/addon/jappixmini/jappix/php/get.php?t=js&amp;f=caps.js"></script>'."\r\n";
 205         $a->page['htmlhead'] .= '<script type="text/javascript" src="' . $a->get_baseurl() . '/addon/jappixmini/jappix/php/get.php?t=js&amp;f=name.js"></script>'."\r\n";
 206         $a->page['htmlhead'] .= '<script type="text/javascript" src="' . $a->get_baseurl() . '/addon/jappixmini/jappix/php/get.php?t=js&amp;f=roster.js"></script>'."\r\n";
 207
 208         $a->page['htmlhead'] .= '<script type="text/javascript" src="' . $a->get_baseurl() . '/addon/jappixmini/lib.js"></script>'."\r\n";
 209     }
 210
 211     $s .= '<div class="settings-block">';
 212     $s .= '<h3>Jappix Mini addon settings</h3>';
 213     $s .= '<div>';
 214     $s .= '<label for="jappixmini-activate">Activate addon</label>';
 215     $s .= ' <input id="jappixmini-activate" type="checkbox" name="jappixmini-activate" value="1"'.$activate.' />';
 216     $s .= '<br />';
 217     $s .= '<label for="jappixmini-username">Jabber username</label>';
 218     $s .= ' <input id="jappixmini-username" type="text" name="jappixmini-username" value="'.$username.'" />';
 219     $s .= '<br />';
 220     $s .= '<label for="jappixmini-server">Jabber server</label>';
 221     $s .= ' <input id="jappixmini-server" type="text" name="jappixmini-server" value="'.$server.'" />';
 222     $s .= '<br />';
 223
 224     $conf = file_get_contents("addon/jappixmini/jappix/store/conf/main.xml");
 225     preg_match("/<bosh_proxy>(.*)<\/bosh_proxy>/", $conf, $matches);
 226     if ($matches[1]=="on") {
 227         $s .= '<label for="jappixmini-bosh">Jabber BOSH host</label>';
 228         $s .= ' <input id="jappixmini-bosh" type="text" name="jappixmini-bosh" value="'.$bosh.'" />';
 229         $s .= '<br />';
 230     }
 231
 232     $s .= '<label for="jappixmini-password">Jabber password</label>';
 233     $s .= ' <input type="hidden" id="jappixmini-password" name="jappixmini-encrypted-password" value="'.$password.'" />';
 234     $s .= ' <input id="jappixmini-clear-password" type="password" value="" onchange="jappixmini_set_password();" />';
 235     $s .= '<br />';
 236     $onchange = "document.getElementById('jappixmini-friendica-password').disabled = !this.checked;jappixmini_set_password();";
 237     $s .= '<label for="jappixmini-encrypt">Encrypt Jabber password with Friendica password (recommended)</label>';
 238     $s .= ' <input id="jappixmini-encrypt" type="checkbox" name="jappixmini-encrypt" onchange="'.$onchange.'" value="1"'.$encrypt_checked.' />';
 239     $s .= '<br />';
 240     $s .= '<label for="jappixmini-friendica-password">Friendica password</label>';
 241     $s .= ' <input id="jappixmini-friendica-password" name="jappixmini-friendica-password" type="password" onchange="jappixmini_set_password();" value=""'.$encrypt_disabled.' />';
 242     $s .= '<br />';
 243     $s .= '<label for="jappixmini-autoapprove">Approve subscription requests from Friendica contacts automatically</label>';
 244     $s .= ' <input id="jappixmini-autoapprove" type="checkbox" name="jappixmini-autoapprove" value="1"'.$autoapprove.' />';
 245     $s .= '<br />';
 246     $s .= '<label for="jappixmini-autosubscribe">Subscribe to Friendica contacts automatically</label>';
 247     $s .= ' <input id="jappixmini-autosubscribe" type="checkbox" name="jappixmini-autosubscribe" value="1"'.$autosubscribe.' />';
 248     $s .= '<br />';
 249     $s .= '<label for="jappixmini-purge">Purge internal list of jabber addresses of contacts</label>';
 250     $s .= ' <input id="jappixmini-purge" type="checkbox" name="jappixmini-purge" value="1" />';
 251     $s .= '<br />';
 252     $s .= '<input type="submit" name="jappixmini-submit" value="' . t('Submit') . '" />';
 253     $s .= ' <input type="button" value="Add contact" onclick="jappixmini_addon_subscribe();" />';
 254     $s .= '</div>';
 255
 256     $a->page['htmlhead'] .= "<script type=\"text/javascript\">
 257         function jappixmini_set_password() {
 258             encrypt = document.getElementById('jappixmini-encrypt').checked;
 259             password = document.getElementById('jappixmini-password');
 260             clear_password = document.getElementById('jappixmini-clear-password');
 261             if (encrypt) {
 262                 friendica_password = document.getElementById('jappixmini-friendica-password');
 263                 jappixmini_addon_set_client_secret(friendica_password.value);
 264                 password.value = jappixmini_addon_encrypt_password(clear_password.value);
 265             }
 266             else {
 267                 password.value = clear_password.value;
 268             }
 269         }
 270
 271         jQuery(document).ready(function() {
 272             encrypt = document.getElementById('jappixmini-encrypt').checked;
 273             password = document.getElementById('jappixmini-password');
 274             clear_password = document.getElementById('jappixmini-clear-password');
 275             if (encrypt) {
 276                 clear_password.value = jappixmini_addon_decrypt_password(password.value);
 277             }
 278             else {
 279                 clear_password.value = password.value;
 280             }
 281         });
 282     </script>";
 283 }
 284
 285 function jappixmini_settings_post(&$a,&$b) {
 286         // save addon settings for a user
 287
 288         if (!file_exists("addon/jappixmini/jappix")) return;
 289
 290         if(! local_user()) return;
 291         $uid = local_user();
 292
 293         if($_POST['jappixmini-submit']) {
 294                 $encrypt = intval($b['jappixmini-encrypt']);
 295                 if ($encrypt) {
 296                         // check that Jabber password was encrypted with correct Friendica password
 297                         $friendica_password = trim($b['jappixmini-friendica-password']);
 298                         $encrypted = hash('whirlpool',$friendica_password);
 299                         $r = q("SELECT * FROM `user` WHERE `uid`=$uid AND `password`='%s'",
 300                                 dbesc($encrypted)
 301                         );
 302                         if (!count($r)) {
 303                                 info("Wrong friendica password!");
 304                                 return;
 305                         }
 306                 }
 307
 308                 $purge = intval($b['jappixmini-purge']);
 309
 310                 $username = trim($b['jappixmini-username']);
 311                 $old_username = get_pconfig($uid,'jappixmini','username');
 312                 if ($username!=$old_username) $purge = 1;
 313
 314                 $server = trim($b['jappixmini-server']);
 315                 $old_server = get_pconfig($uid,'jappixmini','server');
 316                 if ($server!=$old_server) $purge = 1;
 317
 318                 set_pconfig($uid,'jappixmini','username',$username);
 319                 set_pconfig($uid,'jappixmini','server',$server);
 320                 set_pconfig($uid,'jappixmini','bosh',trim($b['jappixmini-bosh']));
 321                 set_pconfig($uid,'jappixmini','password',trim($b['jappixmini-encrypted-password']));
 322                 set_pconfig($uid,'jappixmini','autosubscribe',intval($b['jappixmini-autosubscribe']));
 323                 set_pconfig($uid,'jappixmini','autoapprove',intval($b['jappixmini-autoapprove']));
 324                 set_pconfig($uid,'jappixmini','activate',intval($b['jappixmini-activate']));
 325                 set_pconfig($uid,'jappixmini','encrypt',$encrypt);
 326                 info( 'Jappix Mini settings saved.' );
 327
 328                 if ($purge) {
 329                         q("DELETE FROM `pconfig` WHERE `uid`=$uid AND `cat`='jappixmini' and `k` LIKE 'id%%'");
 330                         info( 'List of addresses purged.' );
 331                 }
 332         }
 333 }
 334
 335 function jappixmini_script(&$a,&$s) {
 336     // adds the script to the page header which starts Jappix Mini
 337
 338     if (!file_exists("addon/jappixmini/jappix")) return;
 339     if(! local_user()) return;
 340
 341     $activate = get_pconfig(local_user(),'jappixmini','activate');
 342     if (!$activate) return;
 343
 344     $a->page['htmlhead'] .= '<script type="text/javascript" src="' . $a->get_baseurl() . '/addon/jappixmini/jappix/php/get.php?t=js&amp;g=mini.xml"></script>'."\r\n";
 345     $a->page['htmlhead'] .= '<script type="text/javascript" src="' . $a->get_baseurl() . '/addon/jappixmini/jappix/php/get.php?t=js&amp;f=presence.js"></script>'."\r\n";
 346
 347     $a->page['htmlhead'] .= '<script type="text/javascript" src="' . $a->get_baseurl() . '/addon/jappixmini/jappix/php/get.php?t=js&amp;f=caps.js"></script>'."\r\n";
 348     $a->page['htmlhead'] .= '<script type="text/javascript" src="' . $a->get_baseurl() . '/addon/jappixmini/jappix/php/get.php?t=js&amp;f=name.js"></script>'."\r\n";
 349     $a->page['htmlhead'] .= '<script type="text/javascript" src="' . $a->get_baseurl() . '/addon/jappixmini/jappix/php/get.php?t=js&amp;f=roster.js"></script>'."\r\n";
 350
 351     $a->page['htmlhead'] .= '<script type="text/javascript" src="' . $a->get_baseurl() . '/addon/jappixmini/lib.js"></script>'."\r\n";
 352
 353     $username = get_pconfig(local_user(),'jappixmini','username');
 354     $username = str_replace("'", "\\'", $username);
 355     $server = get_pconfig(local_user(),'jappixmini','server');
 356     $server = str_replace("'", "\\'", $server);
 357     $bosh = get_pconfig(local_user(),'jappixmini','bosh');
 358     $bosh = str_replace("'", "\\'", $bosh);
 359     $encrypt = get_pconfig(local_user(),'jappixmini','encrypt');
 360     $encrypt = intval($encrypt);
 361     $password = get_pconfig(local_user(),'jappixmini','password');
 362     $password = str_replace("'", "\\'", $password);
 363
 364     $autoapprove = get_pconfig(local_user(),'jappixmini','autoapprove');
 365     $autoapprove = intval($autoapprove);
 366     $autosubscribe = get_pconfig(local_user(),'jappixmini','autosubscribe');
 367     $autosubscribe = intval($autosubscribe);
 368
 369     // deactivate bosh host if proxy is off
 370     $conf = file_get_contents("addon/jappixmini/jappix/store/conf/main.xml");
 371     preg_match("/<bosh_proxy>(.*)<\/bosh_proxy>/", $conf, $matches);
 372     if ($matches[1]!="on") {
 373         $bosh = '';
 374     }
 375
 376     // get a list of jabber accounts of the contacts
 377     $contacts = Array();
 378     $uid = local_user();
 379     $rows = q("SELECT * FROM `pconfig` WHERE `uid`=$uid AND `cat`='jappixmini' and `k` LIKE 'id%%'");
 380     foreach ($rows as $row) {
 381         $key = $row['k'];
 382         $pos = strpos($key, ":");
 383         $dfrn_id = substr($key, $pos+1);
 384         $r = q("SELECT `name` FROM `contact` WHERE `uid`=$uid AND `dfrn-id`='%s' OR `issued-id`='%s'",
 385                 dbesc($dfrn_id),
 386                 dbesc($dfrn_id)
 387         );
 388         $name = $r[0]["name"];
 389
 390         $value = $row['v'];
 391         $pos = strpos($value, ":");
 392         $address = substr($value, $pos+1);
 393         if (!$address) continue;
 394         if (!$name) $name = $address;
 395
 396         $contacts[$address] = $name;
 397     }
 398     $contacts_json = json_encode($contacts);
 399
 400     // get nickname
 401     $r = q("SELECT `username` FROM `user` WHERE `uid`=$uid");
 402     $nickname = json_encode($r[0]["username"]);
 403
 404     // add javascript to start Jappix Mini
 405     $a->page['htmlhead'] .= "<script type=\"text/javascript\">
 406         jQuery(document).ready(function() {
 407            jappixmini_addon_start('$server', '$username', '$bosh', $encrypt, '$password', $nickname);
 408            jappixmini_manage_roster($contacts_json, $autoapprove, $autosubscribe);
 409         });
 410     </script>";
 411
 412     return;
 413 }
 414
 415 function jappixmini_login(&$a, &$o) {
 416     // create client secret on login to be able to encrypt jabber passwords
 417
 418     if (!file_exists("addon/jappixmini/jappix")) return;
 419
 420     // for setDB, needed by jappixmini_addon_set_client_secret
 421     $a->page['htmlhead'] .= '<script type="text/javascript" src="' . $a->get_baseurl() . '/addon/jappixmini/jappix/php/get.php?t=js&amp;f=datastore.js"></script>'."\r\n";
 422
 423     // for str_sha1, needed by jappixmini_addon_set_client_secret
 424     $a->page['htmlhead'] .= '<script type="text/javascript" src="' . $a->get_baseurl() . '/addon/jappixmini/jappix/php/get.php?t=js&amp;f=jsjac.js"></script>'."\r\n";
 425
 426     // for jappixmini_addon_set_client_secret
 427     $a->page['htmlhead'] .= '<script type="text/javascript" src="' . $a->get_baseurl() . '/addon/jappixmini/lib.js"></script>'."\r\n";
 428
 429     // save hash of password
 430     $o = str_replace("<form ", "<form onsubmit=\"jappixmini_addon_set_client_secret(this.elements['id_password'].value);return true;\" ", $o);
 431 }
 432
 433 function jappixmini_cron(&$a, $d) {
 434         // For autosubscribe/autoapprove, we need to maintain a list of jabber addresses of our contacts.
 435
 436         if (!file_exists("addon/jappixmini/jappix")) return;
 437
 438         // go through list of users with jabber enabled
 439         $users = q("SELECT `uid` FROM `pconfig` WHERE `cat`='jappixmini' AND (`k`='autosubscribe' OR `k`='autoapprove') AND `v`='1'");
 440
 441         foreach ($users as $row) {
 442                 $uid = $row["uid"];
 443
 444                 // for each user, go through list of contacts
 445                 $contacts = q("SELECT * FROM `contact` WHERE `uid`=%d AND ((LENGTH(`dfrn-id`) AND LENGTH(`pubkey`)) OR (LENGTH(`issued-id`) AND LENGTH(`prvkey`)))", intval($uid));
 446                 foreach ($contacts as $contact_row) {
 447                         $request = $contact_row["request"];
 448                         if (!$request) continue;
 449
 450                         $dfrn_id = $contact_row["dfrn-id"];
 451                         if ($dfrn_id) {
 452                                 $key = $contact_row["pubkey"];
 453                                 $encrypt_func = openssl_public_encrypt;
 454                                 $decrypt_func = openssl_public_decrypt;
 455                                 $role = "prv";
 456                         } else {
 457                                 $dfrn_id = $contact_row["issued-id"];
 458                                 $key = $contact_row["prvkey"];
 459                                 $encrypt_func = openssl_private_encrypt;
 460                                 $decrypt_func = openssl_private_decrypt;
 461                                 $role = "pub";
 462                         }
 463
 464                         // check if jabber address already present
 465                         $present = get_pconfig($uid, "jappixmini", "id:".$dfrn_id);
 466                         $now = intval(time());
 467                         if ($present) {
 468                                 // $present has format "timestamp:jabber_address"
 469                                 $p = strpos($present, ":");
 470                                 $timestamp = intval(substr($present, 0, $p));
 471
 472                                 // do not re-retrieve jabber address if last retrieval
 473                                 // is not older than a week
 474                                 if ($now-$timestamp<3600*24*7) continue;
 475                         }
 476
 477                         // construct base retrieval address
 478                         $pos = strpos($request, "/dfrn_request/");
 479                         if ($pos===false) continue;
 480
 481                         $base = substr($request, 0, $pos)."/jappixmini?role=$role";
 482
 483                         // construct own address
 484                         $username = get_pconfig($uid, 'jappixmini', 'username');
 485                         if (!$username) continue;
 486                         $server = get_pconfig($uid, 'jappixmini', 'server');
 487                         if (!$server) continue;
 488
 489                         $address = $username."@".$server;
 490
 491                         // sign address
 492                         $signed_address = "";
 493                         $encrypt_func($address, $signed_address, $key);
 494
 495                         // construct request url
 496                         $signed_address_hex = bin2hex($signed_address);
 497                         $url = $base."&signed_address=$signed_address_hex&dfrn_id=".urlencode($dfrn_id);
 498
 499                         try {
 500                                 // send request
 501                                 $answer_json = fetch_url($url);
 502
 503                                 // parse answer
 504                                 $answer = json_decode($answer_json);
 505                                 if ($answer->status != "ok") throw new Exception();
 506
 507                                 $encrypted_address_hex = $answer->encrypted_address;
 508                                 if (!$encrypted_address_hex) throw new Exception();
 509
 510                                 $encrypted_address = hex2bin($encrypted_address_hex);
 511                                 if (!$encrypted_address) throw new Exception();
 512
 513                                 // decrypt address
 514                                 $decrypted_address = "";
 515                                 $decrypt_func($encrypted_address, $decrypted_address, $key);
 516                                 if (!$decrypted_address) throw new Exception();
 517                         } catch (Exception $e) {
 518                                 $decrypted_address = "";
 519                         }
 520
 521                         // save address
 522                         set_pconfig($uid, "jappixmini", "id:$dfrn_id", "$now:$decrypted_address");
 523                 }
 524         }
 525 }
 526
 527 function jappixmini_download_source(&$a,&$b) {
 528         // Jappix Mini source download link on About page
 529
 530         if (!file_exists("addon/jappixmini/jappix")) return;
 531
 532         $b .= '<h1>Jappix Mini</h1>';
 533         $b .= '<p>This site uses Jappix Mini by the <a href="'.$a->get_baseurl().'/addon/jappixmini/jappix/AUTHORS">Jappix authors</a>, which is distributed under the terms of the <a href="'.$a->get_baseurl().'/addon/jappixmini/jappix/COPYING">GNU Affero General Public License</a>.</p>';
 534         $b .= '<p>You can download the <a href="'.$a->get_baseurl().'/addon/jappixmini/jappix.zip">source code</a>.</p>';
 535 }