includes/libs/virtualrest/RestbaseVirtualRESTService.php

   1 <?php
   2 /**
   3  * Virtual HTTP service client for RESTBase
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  */
  20
  21 /**
  22  * Virtual REST service for RESTBase
  23  * @since 1.25
  24  */
  25 class RestbaseVirtualRESTService extends VirtualRESTService {
  26         /**
  27          * Example RESTBase v1 requests:
  28          *  GET /local/v1/page/html/{title}{/revision}
  29          *  POST /local/v1/transform/html/to/wikitext{/title}{/revision}
  30          *   * body: array( 'html' => ... )
  31          *  POST /local/v1/transform/wikitext/to/html{/title}{/revision}
  32          *   * body: array( 'wikitext' => ... ) or array( 'wikitext' => ..., 'body_only' => true/false )
  33          *
  34          * @param array $params Key/value map
  35          *   - url            : RESTBase server URL
  36          *   - domain         : Wiki domain to use
  37          *   - timeout        : request timeout in seconds (optional)
  38          *   - forwardCookies : cookies to forward to RESTBase/Parsoid (as a Cookie
  39          *                       header string) or false (optional)
  40          *                       Note: forwardCookies will in the future be a boolean
  41          *                       only, signifing request cookies should be forwarded
  42          *                       to the service; the current state is due to the way
  43          *                       VE handles this particular parameter
  44          *   - HTTPProxy      : HTTP proxy to use (optional)
  45          *   - parsoidCompat  : whether to parse URL as if they were meant for Parsoid
  46          *                       boolean (optional)
  47          *   - fixedUrl       : Do not append domain to the url. For example to use
  48          *                       English Wikipedia restbase, you would this to true
  49          *                       and url to https://en.wikipedia.org/api/rest_#version#
  50          */
  51         public function __construct( array $params ) {
  52                 // set up defaults and merge them with the given params
  53                 $mparams = array_merge( [
  54                         'name' => 'restbase',
  55                         'url' => 'http://localhost:7231/',
  56                         'domain' => 'localhost',
  57                         'timeout' => 100,
  58                         'forwardCookies' => false,
  59                         'HTTPProxy' => null,
  60                         'parsoidCompat' => false,
  61                         'fixedUrl' => false,
  62                 ], $params );
  63                 // Ensure that the url parameter has a trailing slash.
  64                 if ( substr( $mparams['url'], -1 ) !== '/' ) {
  65                         $mparams['url'] .= '/';
  66                 }
  67                 // Ensure the correct domain format: strip protocol, port,
  68                 // and trailing slash if present.  This lets us use
  69                 // $wgCanonicalServer as a default value, which is very convenient.
  70                 $mparams['domain'] = preg_replace(
  71                         '/^(https?:\/\/)?([^\/:]+?)(:\d+)?\/?$/',
  72                         '$2',
  73                         $mparams['domain']
  74                 );
  75                 parent::__construct( $mparams );
  76         }
  77
  78         public function onRequests( array $reqs, Closure $idGenFunc ) {
  79                 if ( $this->params['parsoidCompat'] ) {
  80                         return $this->onParsoidRequests( $reqs, $idGenFunc );
  81                 }
  82
  83                 $result = [];
  84                 foreach ( $reqs as $key => $req ) {
  85                         if ( $this->params['fixedUrl'] ) {
  86                                 $version = explode( '/', $req['url'] )[1];
  87                                 $req['url'] =
  88                                         str_replace( '#version#', $version, $this->params['url'] ) .
  89                                         preg_replace( '#^local/v./#', '', $req['url'] );
  90                         } else {
  91                                 // replace /local/ with the current domain
  92                                 $req['url'] = preg_replace( '#^local/#', $this->params['domain'] . '/', $req['url'] );
  93                                 // and prefix it with the service URL
  94                                 $req['url'] = $this->params['url'] . $req['url'];
  95                         }
  96
  97                         // set the appropriate proxy, timeout and headers
  98                         if ( $this->params['HTTPProxy'] ) {
  99                                 $req['proxy'] = $this->params['HTTPProxy'];
 100                         }
 101                         if ( $this->params['timeout'] != null ) {
 102                                 $req['reqTimeout'] = $this->params['timeout'];
 103                         }
 104                         if ( $this->params['forwardCookies'] ) {
 105                                 $req['headers']['Cookie'] = $this->params['forwardCookies'];
 106                         }
 107                         $result[$key] = $req;
 108                 }
 109
 110                 return $result;
 111         }
 112
 113         /**
 114          * Remaps Parsoid v1/v3 requests to RESTBase v1 requests.
 115          * @param array $reqs
 116          * @param Closure $idGeneratorFunc
 117          * @return array
 118          * @throws Exception
 119          */
 120         public function onParsoidRequests( array $reqs, Closure $idGeneratorFunc ) {
 121                 $result = [];
 122                 foreach ( $reqs as $key => $req ) {
 123                         $version = explode( '/', $req['url'] )[1];
 124                         if ( $version === 'v3' ) {
 125                                 $result[$key] = $this->onParsoid3Request( $req, $idGeneratorFunc );
 126                         } elseif ( $version === 'v1' ) {
 127                                 $result[$key] = $this->onParsoid1Request( $req, $idGeneratorFunc );
 128                         } else {
 129                                 throw new Exception( "Only v1 and v3 are supported." );
 130                         }
 131                 }
 132
 133                 return $result;
 134         }
 135
 136         /**
 137          * Remap a Parsoid v1 request to a RESTBase v1 request.
 138          *
 139          * Example Parsoid v1 requests:
 140          *  GET /local/v1/page/$title/html/$oldid
 141          *   * $oldid is optional
 142          *  POST /local/v1/transform/html/to/wikitext/$title/$oldid
 143          *   * body: array( 'html' => ... )
 144          *   * $title and $oldid are optional
 145          *  POST /local/v1/transform/wikitext/to/html/$title
 146          *   * body: array( 'wikitext' => ... ) or array( 'wikitext' => ..., 'body' => true/false )
 147          *   * $title is optional
 148          *
 149          * NOTE: the POST APIs aren't "real" Parsoid v1 APIs, they are just what
 150          * Visual Editor "pretends" the V1 API is like.  (See
 151          * ParsoidVirtualRESTService.)
 152          * @param array $req
 153          * @param Closure $idGeneratorFunc
 154          * @return array
 155          * @throws Exception
 156          */
 157         public function onParsoid1Request( array $req, Closure $idGeneratorFunc ) {
 158                 $parts = explode( '/', $req['url'] );
 159                 list(
 160                         $targetWiki, // 'local'
 161                         $version, // 'v1'
 162                         $reqType // 'page' or 'transform'
 163                 ) = $parts;
 164                 if ( $targetWiki !== 'local' ) {
 165                         throw new Exception( "Only 'local' target wiki is currently supported" );
 166                 } elseif ( $version !== 'v1' ) {
 167                         throw new Exception( "Version mismatch: should not happen." );
 168                 } elseif ( $reqType !== 'page' && $reqType !== 'transform' ) {
 169                         throw new Exception( "Request type must be either 'page' or 'transform'" );
 170                 }
 171                 $req['url'] = $this->params['url'] . $this->params['domain'] . '/v1/' . $reqType . '/';
 172                 if ( $reqType === 'page' ) {
 173                         $title = $parts[3];
 174                         if ( $parts[4] !== 'html' ) {
 175                                 throw new Exception( "Only 'html' output format is currently supported" );
 176                         }
 177                         $req['url'] .= 'html/' . $title;
 178                         if ( isset( $parts[5] ) ) {
 179                                 $req['url'] .= '/' . $parts[5];
 180                         } elseif ( isset( $req['query']['oldid'] ) && $req['query']['oldid'] ) {
 181                                 $req['url'] .= '/' . $req['query']['oldid'];
 182                                 unset( $req['query']['oldid'] );
 183                         }
 184                 } elseif ( $reqType === 'transform' ) {
 185                         // from / to transform
 186                         $req['url'] .= $parts[3] . '/to/' . $parts[5];
 187                         // the title
 188                         if ( isset( $parts[6] ) ) {
 189                                 $req['url'] .= '/' . $parts[6];
 190                         }
 191                         // revision id
 192                         if ( isset( $parts[7] ) ) {
 193                                 $req['url'] .= '/' . $parts[7];
 194                         } elseif ( isset( $req['body']['oldid'] ) && $req['body']['oldid'] ) {
 195                                 $req['url'] .= '/' . $req['body']['oldid'];
 196                                 unset( $req['body']['oldid'] );
 197                         }
 198                         if ( $parts[4] !== 'to' ) {
 199                                 throw new Exception( "Part index 4 is not 'to'" );
 200                         }
 201                         if ( $parts[3] === 'html' && $parts[5] === 'wikitext' ) {
 202                                 if ( !isset( $req['body']['html'] ) ) {
 203                                         throw new Exception( "You must set an 'html' body key for this request" );
 204                                 }
 205                         } elseif ( $parts[3] == 'wikitext' && $parts[5] == 'html' ) {
 206                                 if ( !isset( $req['body']['wikitext'] ) ) {
 207                                         throw new Exception( "You must set a 'wikitext' body key for this request" );
 208                                 }
 209                                 if ( isset( $req['body']['body'] ) ) {
 210                                         $req['body']['body_only'] = $req['body']['body'];
 211                                         unset( $req['body']['body'] );
 212                                 }
 213                         } else {
 214                                 throw new Exception( "Transformation unsupported" );
 215                         }
 216                 }
 217                 // set the appropriate proxy, timeout and headers
 218                 if ( $this->params['HTTPProxy'] ) {
 219                         $req['proxy'] = $this->params['HTTPProxy'];
 220                 }
 221                 if ( $this->params['timeout'] != null ) {
 222                         $req['reqTimeout'] = $this->params['timeout'];
 223                 }
 224                 if ( $this->params['forwardCookies'] ) {
 225                         $req['headers']['Cookie'] = $this->params['forwardCookies'];
 226                 }
 227
 228                 return $req;
 229         }
 230
 231         /**
 232          * Remap a Parsoid v3 request to a RESTBase v1 request.
 233          *
 234          * Example Parsoid v3 requests:
 235          *  GET /local/v3/page/html/$title/{$revision}
 236          *   * $revision is optional
 237          *  POST /local/v3/transform/html/to/wikitext/{$title}{/$revision}
 238          *   * body: array( 'html' => ... )
 239          *   * $title and $revision are optional
 240          *  POST /local/v3/transform/wikitext/to/html/{$title}{/$revision}
 241          *   * body: array( 'wikitext' => ... ) or array( 'wikitext' => ..., 'body_only' => true/false )
 242          *   * $title is optional
 243          *   * $revision is optional
 244          * @param array $req
 245          * @param Closure $idGeneratorFunc
 246          * @return array
 247          * @throws Exception
 248          */
 249         public function onParsoid3Request( array $req, Closure $idGeneratorFunc ) {
 250                 $parts = explode( '/', $req['url'] );
 251                 list(
 252                         $targetWiki, // 'local'
 253                         $version, // 'v3'
 254                         $action, // 'transform' or 'page'
 255                         $format, // 'html' or 'wikitext'
 256                         // $title, // optional
 257                         // $revision, // optional
 258                 ) = $parts;
 259                 if ( $targetWiki !== 'local' ) {
 260                         throw new Exception( "Only 'local' target wiki is currently supported" );
 261                 } elseif ( $version !== 'v3' ) {
 262                         throw new Exception( "Version mismatch: should not happen." );
 263                 }
 264                 // replace /local/ with the current domain, change v3 to v1,
 265                 $req['url'] = preg_replace( '#^local/v3/#', $this->params['domain'] . '/v1/', $req['url'] );
 266                 // and prefix it with the service URL
 267                 $req['url'] = $this->params['url'] . $req['url'];
 268                 // set the appropriate proxy, timeout and headers
 269                 if ( $this->params['HTTPProxy'] ) {
 270                         $req['proxy'] = $this->params['HTTPProxy'];
 271                 }
 272                 if ( $this->params['timeout'] != null ) {
 273                         $req['reqTimeout'] = $this->params['timeout'];
 274                 }
 275                 if ( $this->params['forwardCookies'] ) {
 276                         $req['headers']['Cookie'] = $this->params['forwardCookies'];
 277                 }
 278
 279                 return $req;
 280         }
 281
 282 }