resources/src/mediawiki/api.js

   1 ( function ( mw, $ ) {
   2
   3         /**
   4          * @class mw.Api
   5          */
   6
   7         /**
   8          * @property {Object} defaultOptions Default options for #ajax calls. Can be overridden by passing
   9          *     `options` to mw.Api constructor.
  10          * @property {Object} defaultOptions.parameters Default query parameters for API requests.
  11          * @property {Object} defaultOptions.ajax Default options for jQuery#ajax.
  12          * @private
  13          */
  14         var defaultOptions = {
  15                         parameters: {
  16                                 action: 'query',
  17                                 format: 'json'
  18                         },
  19                         ajax: {
  20                                 url: mw.util.wikiScript( 'api' ),
  21                                 timeout: 30 * 1000, // 30 seconds
  22                                 dataType: 'json'
  23                         }
  24                 },
  25
  26                 // Keyed by ajax url and symbolic name for the individual request
  27                 promises = {};
  28
  29         // Pre-populate with fake ajax promises to save http requests for tokens
  30         // we already have on the page via the user.tokens module (bug 34733).
  31         promises[ defaultOptions.ajax.url ] = {};
  32         $.each( mw.user.tokens.get(), function ( key, value ) {
  33                 // This requires #getToken to use the same key as user.tokens.
  34                 // Format: token-type + "Token" (eg. editToken, patrolToken, watchToken).
  35                 promises[ defaultOptions.ajax.url ][ key ] = $.Deferred()
  36                         .resolve( value )
  37                         .promise( { abort: function () {} } );
  38         } );
  39
  40         /**
  41          * Constructor to create an object to interact with the API of a particular MediaWiki server.
  42          * mw.Api objects represent the API of a particular MediaWiki server.
  43          *
  44          *     var api = new mw.Api();
  45          *     api.get( {
  46          *         action: 'query',
  47          *         meta: 'userinfo'
  48          *     } ).done( function ( data ) {
  49          *         console.log( data );
  50          *     } );
  51          *
  52          * Since MW 1.25, multiple values for a parameter can be specified using an array:
  53          *
  54          *     var api = new mw.Api();
  55          *     api.get( {
  56          *         action: 'query',
  57          *         meta: [ 'userinfo', 'siteinfo' ] // same effect as 'userinfo|siteinfo'
  58          *     } ).done( function ( data ) {
  59          *         console.log( data );
  60          *     } );
  61          *
  62          * Since MW 1.26, boolean values for a parameter can be specified directly. If the value is
  63          * `false` or `undefined`, the parameter will be omitted from the request, as required by the API.
  64          *
  65          * @constructor
  66          * @param {Object} [options] See #defaultOptions documentation above. Can also be overridden for
  67          *  each individual request by passing them to #get or #post (or directly #ajax) later on.
  68          */
  69         mw.Api = function ( options ) {
  70                 // TODO: Share API objects with exact same config.
  71                 options = options || {};
  72
  73                 // Force a string if we got a mw.Uri object
  74                 if ( options.ajax && options.ajax.url !== undefined ) {
  75                         options.ajax.url = String( options.ajax.url );
  76                 }
  77
  78                 options.parameters = $.extend( {}, defaultOptions.parameters, options.parameters );
  79                 options.ajax = $.extend( {}, defaultOptions.ajax, options.ajax );
  80
  81                 this.defaults = options;
  82                 this.requests = [];
  83         };
  84
  85         mw.Api.prototype = {
  86                 /**
  87                  * Abort all unfinished requests issued by this Api object.
  88                  *
  89                  * @method
  90                  */
  91                 abort: function () {
  92                         $.each( this.requests, function ( index, request ) {
  93                                 request.abort();
  94                         } );
  95                 },
  96
  97                 /**
  98                  * Perform API get request
  99                  *
 100                  * @param {Object} parameters
 101                  * @param {Object} [ajaxOptions]
 102                  * @return {jQuery.Promise}
 103                  */
 104                 get: function ( parameters, ajaxOptions ) {
 105                         ajaxOptions = ajaxOptions || {};
 106                         ajaxOptions.type = 'GET';
 107                         return this.ajax( parameters, ajaxOptions );
 108                 },
 109
 110                 /**
 111                  * Perform API post request
 112                  *
 113                  * @param {Object} parameters
 114                  * @param {Object} [ajaxOptions]
 115                  * @return {jQuery.Promise}
 116                  */
 117                 post: function ( parameters, ajaxOptions ) {
 118                         ajaxOptions = ajaxOptions || {};
 119                         ajaxOptions.type = 'POST';
 120                         return this.ajax( parameters, ajaxOptions );
 121                 },
 122
 123                 /**
 124                  * Massage parameters from the nice format we accept into a format suitable for the API.
 125                  *
 126                  * @private
 127                  * @param {Object} parameters (modified in-place)
 128                  */
 129                 preprocessParameters: function ( parameters ) {
 130                         var key;
 131                         // Handle common MediaWiki API idioms for passing parameters
 132                         for ( key in parameters ) {
 133                                 // Multiple values are pipe-separated
 134                                 if ( $.isArray( parameters[ key ] ) ) {
 135                                         parameters[ key ] = parameters[ key ].join( '|' );
 136                                 }
 137                                 // Boolean values are only false when not given at all
 138                                 if ( parameters[ key ] === false || parameters[ key ] === undefined ) {
 139                                         delete parameters[ key ];
 140                                 }
 141                         }
 142                 },
 143
 144                 /**
 145                  * Perform the API call.
 146                  *
 147                  * @param {Object} parameters
 148                  * @param {Object} [ajaxOptions]
 149                  * @return {jQuery.Promise} Done: API response data and the jqXHR object.
 150                  *  Fail: Error code
 151                  */
 152                 ajax: function ( parameters, ajaxOptions ) {
 153                         var token,
 154                                 apiDeferred = $.Deferred(),
 155                                 xhr, key, formData;
 156
 157                         parameters = $.extend( {}, this.defaults.parameters, parameters );
 158                         ajaxOptions = $.extend( {}, this.defaults.ajax, ajaxOptions );
 159
 160                         // Ensure that token parameter is last (per [[mw:API:Edit#Token]]).
 161                         if ( parameters.token ) {
 162                                 token = parameters.token;
 163                                 delete parameters.token;
 164                         }
 165
 166                         this.preprocessParameters( parameters );
 167
 168                         // If multipart/form-data has been requested and emulation is possible, emulate it
 169                         if (
 170                                 ajaxOptions.type === 'POST' &&
 171                                 window.FormData &&
 172                                 ajaxOptions.contentType === 'multipart/form-data'
 173                         ) {
 174
 175                                 formData = new FormData();
 176
 177                                 for ( key in parameters ) {
 178                                         formData.append( key, parameters[ key ] );
 179                                 }
 180                                 // If we extracted a token parameter, add it back in.
 181                                 if ( token ) {
 182                                         formData.append( 'token', token );
 183                                 }
 184
 185                                 ajaxOptions.data = formData;
 186
 187                                 // Prevent jQuery from mangling our FormData object
 188                                 ajaxOptions.processData = false;
 189                                 // Prevent jQuery from overriding the Content-Type header
 190                                 ajaxOptions.contentType = false;
 191                         } else {
 192                                 // Some deployed MediaWiki >= 1.17 forbid periods in URLs, due to an IE XSS bug
 193                                 // So let's escape them here. See bug #28235
 194                                 // This works because jQuery accepts data as a query string or as an Object
 195                                 ajaxOptions.data = $.param( parameters ).replace( /\./g, '%2E' );
 196
 197                                 // If we extracted a token parameter, add it back in.
 198                                 if ( token ) {
 199                                         ajaxOptions.data += '&token=' + encodeURIComponent( token );
 200                                 }
 201
 202                                 if ( ajaxOptions.contentType === 'multipart/form-data' ) {
 203                                         // We were asked to emulate but can't, so drop the Content-Type header, otherwise
 204                                         // it'll be wrong and the server will fail to decode the POST body
 205                                         delete ajaxOptions.contentType;
 206                                 }
 207                         }
 208
 209                         // Make the AJAX request
 210                         xhr = $.ajax( ajaxOptions )
 211                                 // If AJAX fails, reject API call with error code 'http'
 212                                 // and details in second argument.
 213                                 .fail( function ( xhr, textStatus, exception ) {
 214                                         apiDeferred.reject( 'http', {
 215                                                 xhr: xhr,
 216                                                 textStatus: textStatus,
 217                                                 exception: exception
 218                                         } );
 219                                 } )
 220                                 // AJAX success just means "200 OK" response, also check API error codes
 221                                 .done( function ( result, textStatus, jqXHR ) {
 222                                         if ( result === undefined || result === null || result === '' ) {
 223                                                 apiDeferred.reject( 'ok-but-empty',
 224                                                         'OK response but empty result (check HTTP headers?)'
 225                                                 );
 226                                         } else if ( result.error ) {
 227                                                 var code = result.error.code === undefined ? 'unknown' : result.error.code;
 228                                                 apiDeferred.reject( code, result );
 229                                         } else {
 230                                                 apiDeferred.resolve( result, jqXHR );
 231                                         }
 232                                 } );
 233
 234                         this.requests.push( xhr );
 235                         // Return the Promise
 236                         return apiDeferred.promise( { abort: xhr.abort } ).fail( function ( code, details ) {
 237                                 if ( !( code === 'http' && details && details.textStatus === 'abort' ) ) {
 238                                         mw.log( 'mw.Api error: ', code, details );
 239                                 }
 240                         } );
 241                 },
 242
 243                 /**
 244                  * Post to API with specified type of token. If we have no token, get one and try to post.
 245                  * If we have a cached token try using that, and if it fails, blank out the
 246                  * cached token and start over. For example to change an user option you could do:
 247                  *
 248                  *     new mw.Api().postWithToken( 'options', {
 249                  *         action: 'options',
 250                  *         optionname: 'gender',
 251                  *         optionvalue: 'female'
 252                  *     } );
 253                  *
 254                  * @param {string} tokenType The name of the token, like options or edit.
 255                  * @param {Object} params API parameters
 256                  * @param {Object} [ajaxOptions]
 257                  * @return {jQuery.Promise} See #post
 258                  * @since 1.22
 259                  */
 260                 postWithToken: function ( tokenType, params, ajaxOptions ) {
 261                         var api = this;
 262
 263                         return api.getToken( tokenType, params.assert ).then( function ( token ) {
 264                                 params.token = token;
 265                                 return api.post( params, ajaxOptions ).then(
 266                                         // If no error, return to caller as-is
 267                                         null,
 268                                         // Error handler
 269                                         function ( code ) {
 270                                                 if ( code === 'badtoken' ) {
 271                                                         api.badToken( tokenType );
 272                                                         // Try again, once
 273                                                         params.token = undefined;
 274                                                         return api.getToken( tokenType, params.assert ).then( function ( token ) {
 275                                                                 params.token = token;
 276                                                                 return api.post( params, ajaxOptions );
 277                                                         } );
 278                                                 }
 279
 280                                                 // Different error, pass on to let caller handle the error code
 281                                                 return this;
 282                                         }
 283                                 );
 284                         } );
 285                 },
 286
 287                 /**
 288                  * Get a token for a certain action from the API.
 289                  *
 290                  * The assert parameter is only for internal use by postWithToken.
 291                  *
 292                  * @param {string} type Token type
 293                  * @return {jQuery.Promise}
 294                  * @return {Function} return.done
 295                  * @return {string} return.done.token Received token.
 296                  * @since 1.22
 297                  */
 298                 getToken: function ( type, assert ) {
 299                         var apiPromise,
 300                                 promiseGroup = promises[ this.defaults.ajax.url ],
 301                                 d = promiseGroup && promiseGroup[ type + 'Token' ];
 302
 303                         if ( !d ) {
 304                                 apiPromise = this.get( { action: 'tokens', type: type, assert: assert } );
 305
 306                                 d = apiPromise
 307                                         .then( function ( data ) {
 308                                                 if ( data.tokens && data.tokens[ type + 'token' ] ) {
 309                                                         return data.tokens[ type + 'token' ];
 310                                                 }
 311
 312                                                 // If token type is not available for this user,
 313                                                 // key '...token' is either missing or set to boolean false
 314                                                 return $.Deferred().reject( 'token-missing', data );
 315                                         }, function () {
 316                                                 // Clear promise. Do not cache errors.
 317                                                 delete promiseGroup[ type + 'Token' ];
 318                                                 // Pass on to allow the caller to handle the error
 319                                                 return this;
 320                                         } )
 321                                         // Attach abort handler
 322                                         .promise( { abort: apiPromise.abort } );
 323
 324                                 // Store deferred now so that we can use it again even if it isn't ready yet
 325                                 if ( !promiseGroup ) {
 326                                         promiseGroup = promises[ this.defaults.ajax.url ] = {};
 327                                 }
 328                                 promiseGroup[ type + 'Token' ] = d;
 329                         }
 330
 331                         return d;
 332                 },
 333
 334                 /**
 335                  * Indicate that the cached token for a certain action of the API is bad.
 336                  *
 337                  * Call this if you get a 'badtoken' error when using the token returned by #getToken.
 338                  * You may also want to use #postWithToken instead, which invalidates bad cached tokens
 339                  * automatically.
 340                  *
 341                  * @param {string} type Token type
 342                  * @since 1.26
 343                  */
 344                 badToken: function ( type ) {
 345                         var promiseGroup = promises[ this.defaults.ajax.url ];
 346                         if ( promiseGroup ) {
 347                                 delete promiseGroup[ type + 'Token' ];
 348                         }
 349                 }
 350         };
 351
 352         /**
 353          * @static
 354          * @property {Array}
 355          * List of errors we might receive from the API.
 356          * For now, this just documents our expectation that there should be similar messages
 357          * available.
 358          */
 359         mw.Api.errors = [
 360                 // occurs when POST aborted
 361                 // jQuery 1.4 can't distinguish abort or lost connection from 200 OK + empty result
 362                 'ok-but-empty',
 363
 364                 // timeout
 365                 'timeout',
 366
 367                 // really a warning, but we treat it like an error
 368                 'duplicate',
 369                 'duplicate-archive',
 370
 371                 // upload succeeded, but no image info.
 372                 // this is probably impossible, but might as well check for it
 373                 'noimageinfo',
 374                 // remote errors, defined in API
 375                 'uploaddisabled',
 376                 'nomodule',
 377                 'mustbeposted',
 378                 'badaccess-groups',
 379                 'missingresult',
 380                 'missingparam',
 381                 'invalid-file-key',
 382                 'copyuploaddisabled',
 383                 'mustbeloggedin',
 384                 'empty-file',
 385                 'file-too-large',
 386                 'filetype-missing',
 387                 'filetype-banned',
 388                 'filetype-banned-type',
 389                 'filename-tooshort',
 390                 'illegal-filename',
 391                 'verification-error',
 392                 'hookaborted',
 393                 'unknown-error',
 394                 'internal-error',
 395                 'overwrite',
 396                 'badtoken',
 397                 'fetchfileerror',
 398                 'fileexists-shared-forbidden',
 399                 'invalidtitle',
 400                 'notloggedin',
 401
 402                 // Stash-specific errors - expanded
 403                 'stashfailed',
 404                 'stasherror',
 405                 'stashedfilenotfound',
 406                 'stashpathinvalid',
 407                 'stashfilestorage',
 408                 'stashzerolength',
 409                 'stashnotloggedin',
 410                 'stashwrongowner',
 411                 'stashnosuchfilekey'
 412         ];
 413
 414         /**
 415          * @static
 416          * @property {Array}
 417          * List of warnings we might receive from the API.
 418          * For now, this just documents our expectation that there should be similar messages
 419          * available.
 420          */
 421         mw.Api.warnings = [
 422                 'duplicate',
 423                 'exists'
 424         ];
 425
 426 }( mediaWiki, jQuery ) );