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
 213     $s .= '<h3>Jappix Mini addon settings</h3>';
 214     $s .= '<div>';
 215     $s .= '<label for="jappixmini-activate">Activate addon</label>';
 216     $s .= ' <input id="jappixmini-activate" type="checkbox" name="jappixmini-activate" value="1"'.$activate.' />';
 217     $s .= '<br />';
 218     $s .= '<label for="jappixmini-username">Jabber username</label>';
 219     $s .= ' <input id="jappixmini-username" type="text" name="jappixmini-username" value="'.$username.'" />';
 220     $s .= '<br />';
 221     $s .= '<label for="jappixmini-server">Jabber server</label>';
 222     $s .= ' <input id="jappixmini-server" type="text" name="jappixmini-server" value="'.$server.'" />';
 223     $s .= '<br />';
 224
 225     $conf = file_get_contents("addon/jappixmini/jappix/store/conf/main.xml");
 226     preg_match("/<bosh_proxy>(.*)<\/bosh_proxy>/", $conf, $matches);
 227     if ($matches[1]=="on") {
 228         $s .= '<label for="jappixmini-bosh">Jabber BOSH host</label>';
 229         $s .= ' <input id="jappixmini-bosh" type="text" name="jappixmini-bosh" value="'.$bosh.'" />';
 230         $s .= '<br />';
 231     }
 232
 233     $s .= '<label for="jappixmini-password">Jabber password</label>';
 234     $s .= ' <input type="hidden" id="jappixmini-password" name="jappixmini-encrypted-password" value="'.$password.'" />';
 235     $s .= ' <input id="jappixmini-clear-password" type="password" value="" onchange="jappixmini_set_password();" />';
 236     $s .= '<br />';
 237     $onchange = "document.getElementById('jappixmini-friendica-password').disabled = !this.checked;jappixmini_set_password();";
 238     $s .= '<label for="jappixmini-encrypt">Encrypt Jabber password with Friendica password (recommended)</label>';
 239     $s .= ' <input id="jappixmini-encrypt" type="checkbox" name="jappixmini-encrypt" onchange="'.$onchange.'" value="1"'.$encrypt_checked.' />';
 240     $s .= '<br />';
 241     $s .= '<label for="jappixmini-friendica-password">Friendica password</label>';
 242     $s .= ' <input id="jappixmini-friendica-password" name="jappixmini-friendica-password" type="password" onchange="jappixmini_set_password();" value=""'.$encrypt_disabled.' />';
 243     $s .= '<br />';
 244     $s .= '<label for="jappixmini-autoapprove">Approve subscription requests from Friendica contacts automatically</label>';
 245     $s .= ' <input id="jappixmini-autoapprove" type="checkbox" name="jappixmini-autoapprove" value="1"'.$autoapprove.' />';
 246     $s .= '<br />';
 247     $s .= '<label for="jappixmini-autosubscribe">Subscribe to Friendica contacts automatically</label>';
 248     $s .= ' <input id="jappixmini-autosubscribe" type="checkbox" name="jappixmini-autosubscribe" value="1"'.$autosubscribe.' />';
 249     $s .= '<br />';
 250     $s .= '<label for="jappixmini-purge">Purge internal list of jabber addresses of contacts</label>';
 251     $s .= ' <input id="jappixmini-purge" type="checkbox" name="jappixmini-purge" value="1" />';
 252     $s .= '<br />';
 253     $s .= '<input type="submit" name="jappixmini-submit" value="' . t('Submit') . '" />';
 254     $s .= ' <input type="button" value="Add contact" onclick="jappixmini_addon_subscribe();" />';
 255     $s .= '</div>';
 256
 257     $s .= '</div>';
 258
 259     $a->page['htmlhead'] .= "<script type=\"text/javascript\">
 260         function jappixmini_set_password() {
 261             encrypt = document.getElementById('jappixmini-encrypt').checked;
 262             password = document.getElementById('jappixmini-password');
 263             clear_password = document.getElementById('jappixmini-clear-password');
 264             if (encrypt) {
 265                 friendica_password = document.getElementById('jappixmini-friendica-password');
 266                 jappixmini_addon_set_client_secret(friendica_password.value);
 267                 password.value = jappixmini_addon_encrypt_password(clear_password.value);
 268             }
 269             else {
 270                 password.value = clear_password.value;
 271             }
 272         }
 273
 274         jQuery(document).ready(function() {
 275             encrypt = document.getElementById('jappixmini-encrypt').checked;
 276             password = document.getElementById('jappixmini-password');
 277             clear_password = document.getElementById('jappixmini-clear-password');
 278             if (encrypt) {
 279                 clear_password.value = jappixmini_addon_decrypt_password(password.value);
 280             }
 281             else {
 282                 clear_password.value = password.value;
 283             }
 284         });
 285     </script>";
 286 }
 287
 288 function jappixmini_settings_post(&$a,&$b) {
 289         // save addon settings for a user
 290
 291         if (!file_exists("addon/jappixmini/jappix")) return;
 292
 293         if(! local_user()) return;
 294         $uid = local_user();
 295
 296         if($_POST['jappixmini-submit']) {
 297                 $encrypt = intval($b['jappixmini-encrypt']);
 298                 if ($encrypt) {
 299                         // check that Jabber password was encrypted with correct Friendica password
 300                         $friendica_password = trim($b['jappixmini-friendica-password']);
 301                         $encrypted = hash('whirlpool',$friendica_password);
 302                         $r = q("SELECT * FROM `user` WHERE `uid`=$uid AND `password`='%s'",
 303                                 dbesc($encrypted)
 304                         );
 305                         if (!count($r)) {
 306                                 info("Wrong friendica password!");
 307                                 return;
 308                         }
 309                 }
 310
 311                 $purge = intval($b['jappixmini-purge']);
 312
 313                 $username = trim($b['jappixmini-username']);
 314                 $old_username = get_pconfig($uid,'jappixmini','username');
 315                 if ($username!=$old_username) $purge = 1;
 316
 317                 $server = trim($b['jappixmini-server']);
 318                 $old_server = get_pconfig($uid,'jappixmini','server');
 319                 if ($server!=$old_server) $purge = 1;
 320
 321                 set_pconfig($uid,'jappixmini','username',$username);
 322                 set_pconfig($uid,'jappixmini','server',$server);
 323                 set_pconfig($uid,'jappixmini','bosh',trim($b['jappixmini-bosh']));
 324                 set_pconfig($uid,'jappixmini','password',trim($b['jappixmini-encrypted-password']));
 325                 set_pconfig($uid,'jappixmini','autosubscribe',intval($b['jappixmini-autosubscribe']));
 326                 set_pconfig($uid,'jappixmini','autoapprove',intval($b['jappixmini-autoapprove']));
 327                 set_pconfig($uid,'jappixmini','activate',intval($b['jappixmini-activate']));
 328                 set_pconfig($uid,'jappixmini','encrypt',$encrypt);
 329                 info( 'Jappix Mini settings saved.' );
 330
 331                 if ($purge) {
 332                         q("DELETE FROM `pconfig` WHERE `uid`=$uid AND `cat`='jappixmini' and `k` LIKE 'id%%'");
 333                         info( 'List of addresses purged.' );
 334                 }
 335         }
 336 }
 337
 338 function jappixmini_script(&$a,&$s) {
 339     // adds the script to the page header which starts Jappix Mini
 340
 341     if (!file_exists("addon/jappixmini/jappix")) return;
 342     if(! local_user()) return;
 343
 344     $activate = get_pconfig(local_user(),'jappixmini','activate');
 345     if (!$activate) return;
 346
 347     $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";
 348     $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";
 349
 350     $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";
 351     $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";
 352     $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";
 353
 354     $a->page['htmlhead'] .= '<script type="text/javascript" src="' . $a->get_baseurl() . '/addon/jappixmini/lib.js"></script>'."\r\n";
 355
 356     $username = get_pconfig(local_user(),'jappixmini','username');
 357     $username = str_replace("'", "\\'", $username);
 358     $server = get_pconfig(local_user(),'jappixmini','server');
 359     $server = str_replace("'", "\\'", $server);
 360     $bosh = get_pconfig(local_user(),'jappixmini','bosh');
 361     $bosh = str_replace("'", "\\'", $bosh);
 362     $encrypt = get_pconfig(local_user(),'jappixmini','encrypt');
 363     $encrypt = intval($encrypt);
 364     $password = get_pconfig(local_user(),'jappixmini','password');
 365     $password = str_replace("'", "\\'", $password);
 366
 367     $autoapprove = get_pconfig(local_user(),'jappixmini','autoapprove');
 368     $autoapprove = intval($autoapprove);
 369     $autosubscribe = get_pconfig(local_user(),'jappixmini','autosubscribe');
 370     $autosubscribe = intval($autosubscribe);
 371
 372     // deactivate bosh host if proxy is off
 373     $conf = file_get_contents("addon/jappixmini/jappix/store/conf/main.xml");
 374     preg_match("/<bosh_proxy>(.*)<\/bosh_proxy>/", $conf, $matches);
 375     if ($matches[1]!="on") {
 376         $bosh = '';
 377     }
 378
 379     // get a list of jabber accounts of the contacts
 380     $contacts = Array();
 381     $uid = local_user();
 382     $rows = q("SELECT * FROM `pconfig` WHERE `uid`=$uid AND `cat`='jappixmini' and `k` LIKE 'id%%'");
 383     foreach ($rows as $row) {
 384         $key = $row['k'];
 385         $pos = strpos($key, ":");
 386         $dfrn_id = substr($key, $pos+1);
 387         $r = q("SELECT `name` FROM `contact` WHERE `uid`=$uid AND `dfrn-id`='%s' OR `issued-id`='%s'",
 388                 dbesc($dfrn_id),
 389                 dbesc($dfrn_id)
 390         );
 391         $name = $r[0]["name"];
 392
 393         $value = $row['v'];
 394         $pos = strpos($value, ":");
 395         $address = substr($value, $pos+1);
 396         if (!$address) continue;
 397         if (!$name) $name = $address;
 398
 399         $contacts[$address] = $name;
 400     }
 401     $contacts_json = json_encode($contacts);
 402
 403     // get nickname
 404     $r = q("SELECT `username` FROM `user` WHERE `uid`=$uid");
 405     $nickname = json_encode($r[0]["username"]);
 406
 407     // add javascript to start Jappix Mini
 408     $a->page['htmlhead'] .= "<script type=\"text/javascript\">
 409         jQuery(document).ready(function() {
 410            jappixmini_addon_start('$server', '$username', '$bosh', $encrypt, '$password', $nickname);
 411            jappixmini_manage_roster($contacts_json, $autoapprove, $autosubscribe);
 412         });
 413     </script>";
 414
 415     return;
 416 }
 417
 418 function jappixmini_login(&$a, &$o) {
 419     // create client secret on login to be able to encrypt jabber passwords
 420
 421     if (!file_exists("addon/jappixmini/jappix")) return;
 422
 423     // for setDB, 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=datastore.js"></script>'."\r\n";
 425
 426     // for str_sha1, needed by jappixmini_addon_set_client_secret
 427     $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";
 428
 429     // for jappixmini_addon_set_client_secret
 430     $a->page['htmlhead'] .= '<script type="text/javascript" src="' . $a->get_baseurl() . '/addon/jappixmini/lib.js"></script>'."\r\n";
 431
 432     // save hash of password
 433     $o = str_replace("<form ", "<form onsubmit=\"jappixmini_addon_set_client_secret(this.elements['id_password'].value);return true;\" ", $o);
 434 }
 435
 436 function jappixmini_cron(&$a, $d) {
 437         // For autosubscribe/autoapprove, we need to maintain a list of jabber addresses of our contacts.
 438
 439         if (!file_exists("addon/jappixmini/jappix")) return;
 440
 441         // go through list of users with jabber enabled
 442         $users = q("SELECT `uid` FROM `pconfig` WHERE `cat`='jappixmini' AND (`k`='autosubscribe' OR `k`='autoapprove') AND `v`='1'");
 443
 444         foreach ($users as $row) {
 445                 $uid = $row["uid"];
 446
 447                 // for each user, go through list of contacts
 448                 $contacts = q("SELECT * FROM `contact` WHERE `uid`=%d AND ((LENGTH(`dfrn-id`) AND LENGTH(`pubkey`)) OR (LENGTH(`issued-id`) AND LENGTH(`prvkey`)))", intval($uid));
 449                 foreach ($contacts as $contact_row) {
 450                         $request = $contact_row["request"];
 451                         if (!$request) continue;
 452
 453                         $dfrn_id = $contact_row["dfrn-id"];
 454                         if ($dfrn_id) {
 455                                 $key = $contact_row["pubkey"];
 456                                 $encrypt_func = openssl_public_encrypt;
 457                                 $decrypt_func = openssl_public_decrypt;
 458                                 $role = "prv";
 459                         } else {
 460                                 $dfrn_id = $contact_row["issued-id"];
 461                                 $key = $contact_row["prvkey"];
 462                                 $encrypt_func = openssl_private_encrypt;
 463                                 $decrypt_func = openssl_private_decrypt;
 464                                 $role = "pub";
 465                         }
 466
 467                         // check if jabber address already present
 468                         $present = get_pconfig($uid, "jappixmini", "id:".$dfrn_id);
 469                         $now = intval(time());
 470                         if ($present) {
 471                                 // $present has format "timestamp:jabber_address"
 472                                 $p = strpos($present, ":");
 473                                 $timestamp = intval(substr($present, 0, $p));
 474
 475                                 // do not re-retrieve jabber address if last retrieval
 476                                 // is not older than a week
 477                                 if ($now-$timestamp<3600*24*7) continue;
 478                         }
 479
 480                         // construct base retrieval address
 481                         $pos = strpos($request, "/dfrn_request/");
 482                         if ($pos===false) continue;
 483
 484                         $base = substr($request, 0, $pos)."/jappixmini?role=$role";
 485
 486                         // construct own address
 487                         $username = get_pconfig($uid, 'jappixmini', 'username');
 488                         if (!$username) continue;
 489                         $server = get_pconfig($uid, 'jappixmini', 'server');
 490                         if (!$server) continue;
 491
 492                         $address = $username."@".$server;
 493
 494                         // sign address
 495                         $signed_address = "";
 496                         $encrypt_func($address, $signed_address, $key);
 497
 498                         // construct request url
 499                         $signed_address_hex = bin2hex($signed_address);
 500                         $url = $base."&signed_address=$signed_address_hex&dfrn_id=".urlencode($dfrn_id);
 501
 502                         try {
 503                                 // send request
 504                                 $answer_json = fetch_url($url);
 505
 506                                 // parse answer
 507                                 $answer = json_decode($answer_json);
 508                                 if ($answer->status != "ok") throw new Exception();
 509
 510                                 $encrypted_address_hex = $answer->encrypted_address;
 511                                 if (!$encrypted_address_hex) throw new Exception();
 512
 513                                 $encrypted_address = hex2bin($encrypted_address_hex);
 514                                 if (!$encrypted_address) throw new Exception();
 515
 516                                 // decrypt address
 517                                 $decrypted_address = "";
 518                                 $decrypt_func($encrypted_address, $decrypted_address, $key);
 519                                 if (!$decrypted_address) throw new Exception();
 520                         } catch (Exception $e) {
 521                                 $decrypted_address = "";
 522                         }
 523
 524                         // save address
 525                         set_pconfig($uid, "jappixmini", "id:$dfrn_id", "$now:$decrypted_address");
 526                 }
 527         }
 528 }
 529
 530 function jappixmini_download_source(&$a,&$b) {
 531         // Jappix Mini source download link on About page
 532
 533         if (!file_exists("addon/jappixmini/jappix")) return;
 534
 535         $b .= '<h1>Jappix Mini</h1>';
 536         $b .= '<p>This site uses Jappix Mini by the <a href="'.$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>';
 537         $b .= '<p>You can download the <a href="'.$a->get_baseurl().'/addon/jappixmini/jappix.zip">source code</a>.</p>';
 538 }