src/shpub/Command/Connect.php

   1 <?php
   2 namespace shpub;
   3
   4 /**
   5  * @link http://micropub.net/draft/
   6  * @link http://indieweb.org/authorization-endpoint
   7  */
   8 class Command_Connect
   9 {
  10     public static $client_id = 'http://cweiske.de/shpub.htm';
  11
  12     public function __construct(Config $cfg)
  13     {
  14         $this->cfg = $cfg;
  15     }
  16
  17     public function run($server, $user, $newKey, $force)
  18     {
  19         $host = $this->getHost($newKey != '' ? $newKey : $server, $force);
  20         if ($host === null) {
  21             //already taken
  22             return;
  23         }
  24         if ($host->endpoints->incomplete()) {
  25             $host->server = $server;
  26             $host->loadEndpoints();
  27         }
  28
  29         list($redirect_uri, $socketStr) = $this->getHttpServerData();
  30         $state = time();
  31         echo "To authenticate, open the following URL:\n"
  32             . $this->getBrowserAuthUrl($host, $user, $redirect_uri, $state)
  33             . "\n";
  34
  35         $authParams = $this->startHttpServer($socketStr);
  36         if ($authParams['state'] != $state) {
  37             Log::err('Wrong "state" parameter value: ' . $authParams['state']);
  38             exit(2);
  39         }
  40         $code    = $authParams['code'];
  41         $userUrl = $authParams['me'];
  42         $this->verifyAuthCode($host, $code, $state, $redirect_uri, $userUrl);
  43
  44         $accessToken = $this->fetchAccessToken(
  45             $host, $userUrl, $code, $redirect_uri, $state
  46         );
  47
  48         //all fine. update config
  49         $host->user  = $userUrl;
  50         $host->token = $accessToken;
  51
  52         if ($newKey != '') {
  53             $hostKey = $newKey;
  54         } else {
  55             $hostKey = $this->cfg->getHostByName($server);
  56             if ($hostKey === null) {
  57                 $keyBase = parse_url($host->server, PHP_URL_HOST);
  58                 $newKey  = $keyBase;
  59                 $count = 0;
  60                 while (isset($this->cfg->hosts[$newKey])) {
  61                     $newKey = $keyBase . ++$count;
  62                 }
  63                 $hostKey = $newKey;
  64             }
  65         }
  66         $this->cfg->hosts[$hostKey] = $host;
  67         $this->cfg->save();
  68     }
  69
  70     protected function fetchAccessToken(
  71         $host, $userUrl, $code, $redirect_uri, $state
  72     ) {
  73         $req = new \HTTP_Request2($host->endpoints->token, 'POST');
  74         $req->setHeader('Content-Type: application/x-www-form-urlencoded');
  75         $req->setBody(
  76             http_build_query(
  77                 [
  78                     'me'           => $userUrl,
  79                     'code'         => $code,
  80                     'redirect_uri' => $redirect_uri,
  81                     'client_id'    => static::$client_id,
  82                     'state'        => $state,
  83                 ]
  84             )
  85         );
  86         $res = $req->send();
  87         if ($res->getHeader('content-type') != 'application/x-www-form-urlencoded') {
  88             Log::err('Wrong content type in auth verification response');
  89             exit(2);
  90         }
  91         parse_str($res->getBody(), $tokenParams);
  92         if (!isset($tokenParams['access_token'])) {
  93             Log::err('"access_token" missing');
  94             exit(2);
  95         }
  96
  97         $accessToken = $tokenParams['access_token'];
  98         return $accessToken;
  99     }
 100
 101     protected function getBrowserAuthUrl($host, $user, $redirect_uri, $state)
 102     {
 103         return $host->endpoints->authorization
 104             . '?me=' . urlencode($user)
 105             . '&client_id=' . urlencode(static::$client_id)
 106             . '&redirect_uri=' . urlencode($redirect_uri)
 107             . '&state=' . $state
 108             . '&scope=post'
 109             . '&response_type=code';
 110     }
 111
 112     protected function getHost($keyOrServer, $force)
 113     {
 114         $host = new Config_Host();
 115         $key = $this->cfg->getHostByName($keyOrServer);
 116         if ($key !== null) {
 117             $host = $this->cfg->hosts[$key];
 118             if (!$force && $host->token != '') {
 119                 Log::err('Token already available');
 120                 return;
 121             }
 122         }
 123         return $host;
 124     }
 125
 126     protected function getHttpServerData()
 127     {
 128         //FIXME: get IP from SSH_CONNECTION
 129         $ip   = '127.0.0.1';
 130         $port = 12345;
 131         $redirect_uri = 'http://' . $ip . ':' . $port . '/callback';
 132         $socketStr    = 'tcp://' . $ip . ':' . $port;
 133         return [$redirect_uri, $socketStr];
 134     }
 135
 136     protected function verifyAuthCode($host, $code, $state, $redirect_uri, $me)
 137     {
 138         $req = new \HTTP_Request2($host->endpoints->authorization, 'POST');
 139         $req->setHeader('Content-Type: application/x-www-form-urlencoded');
 140         $req->setBody(
 141             http_build_query(
 142                 [
 143                     'code'         => $code,
 144                     'state'        => $state,
 145                     'client_id'    => static::$client_id,
 146                     'redirect_uri' => $redirect_uri,
 147                 ]
 148             )
 149         );
 150         $res = $req->send();
 151         if ($res->getHeader('content-type') != 'application/x-www-form-urlencoded') {
 152             Log::err('Wrong content type in auth verification response');
 153             exit(2);
 154         }
 155         parse_str($res->getBody(), $verifiedParams);
 156         if (!isset($verifiedParams['me'])
 157             || $verifiedParams['me'] !== $me
 158         ) {
 159             Log::err('Non-matching "me" values');
 160             exit(2);
 161         }
 162     }
 163
 164     protected function startHttpServer($socketStr)
 165     {
 166         $responseOk = "HTTP/1.0 200 OK\r\n"
 167             . "Content-Type: text/plain\r\n"
 168             . "\r\n"
 169             . "Ok. You may close this tab and return to the shell.\r\n";
 170         $responseErr = "HTTP/1.0 400 Bad Request\r\n"
 171             . "Content-Type: text/plain\r\n"
 172             . "\r\n"
 173             . "Bad Request\r\n";
 174
 175         //5 minutes should be enough for the user to confirm
 176         ini_set('default_socket_timeout', 60 * 5);
 177         $server = stream_socket_server($socketStr, $errno, $errstr);
 178         if (!$server) {
 179             Log::err('Error starting HTTP server');
 180             return false;
 181         }
 182
 183         do {
 184             $sock = stream_socket_accept($server);
 185             if (!$sock) {
 186                 Log::err('Error accepting socket connection');
 187                 exit(1);
 188             }
 189
 190             $headers = [];
 191             $body    = null;
 192             $content_length = 0;
 193             //read request headers
 194             while (false !== ($line = trim(fgets($sock)))) {
 195                 if ('' === $line) {
 196                     break;
 197                 }
 198                 $regex = '#^Content-Length:\s*([[:digit:]]+)\s*$#i';
 199                 if (preg_match($regex, $line, $matches)) {
 200                     $content_length = (int) $matches[1];
 201                 }
 202                 $headers[] = $line;
 203             }
 204
 205             // read content/body
 206             if ($content_length > 0) {
 207                 $body = fread($sock, $content_length);
 208             }
 209
 210             // send response
 211             list($method, $url, $httpver) = explode(' ', $headers[0]);
 212             if ($method == 'GET') {
 213                 $parts = parse_url($url);
 214                 if (isset($parts['path']) && $parts['path'] == '/callback'
 215                     && isset($parts['query'])
 216                 ) {
 217                     parse_str($parts['query'], $query);
 218                     if (isset($query['code'])
 219                         && isset($query['state'])
 220                         && isset($query['me'])
 221                     ) {
 222                         fwrite($sock, $responseOk);
 223                         fclose($sock);
 224                         return $query;
 225                     }
 226                 }
 227             }
 228
 229             fwrite($sock, $responseErr);
 230             fclose($sock);
 231         } while (true);
 232     }
 233 }
 234 ?>