resources/src/mediawiki.api/mediawiki.api.js

   1 ( function ( mw, $ ) {
   2
   3         // We allow people to omit these default parameters from API requests
   4         // there is very customizable error handling here, on a per-call basis
   5         // wondering, would it be simpler to make it easy to clone the api object,
   6         // change error handling, and use that instead?
   7         var defaultOptions = {
   8
   9                         // Query parameters for API requests
  10                         parameters: {
  11                                 action: 'query',
  12                                 format: 'json'
  13                         },
  14
  15                         // Ajax options for jQuery.ajax()
  16                         ajax: {
  17                                 url: mw.util.wikiScript( 'api' ),
  18
  19                                 timeout: 30 * 1000, // 30 seconds
  20
  21                                 dataType: 'json'
  22                         }
  23                 },
  24                 // Keyed by ajax url and symbolic name for the individual request
  25                 promises = {};
  26
  27         // Pre-populate with fake ajax promises to save http requests for tokens
  28         // we already have on the page via the user.tokens module (bug 34733).
  29         promises[ defaultOptions.ajax.url ] = {};
  30         $.each( mw.user.tokens.get(), function ( key, value ) {
  31                 // This requires #getToken to use the same key as user.tokens.
  32                 // Format: token-type + "Token" (eg. editToken, patrolToken, watchToken).
  33                 promises[ defaultOptions.ajax.url ][ key ] = $.Deferred()
  34                         .resolve( value )
  35                         .promise( { abort: function () {} } );
  36         } );
  37
  38         /**
  39          * Constructor to create an object to interact with the API of a particular MediaWiki server.
  40          * mw.Api objects represent the API of a particular MediaWiki server.
  41          *
  42          * TODO: Share API objects with exact same config.
  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          * @class
  53          *
  54          * @constructor
  55          * @param {Object} options See defaultOptions documentation above. Ajax options can also be
  56          *  overridden for each individual request to {@link jQuery#ajax} later on.
  57          */
  58         mw.Api = function ( options ) {
  59
  60                 if ( options === undefined ) {
  61                         options = {};
  62                 }
  63
  64                 // Force a string if we got a mw.Uri object
  65                 if ( options.ajax && options.ajax.url !== undefined ) {
  66                         options.ajax.url = String( options.ajax.url );
  67                 }
  68
  69                 options.parameters = $.extend( {}, defaultOptions.parameters, options.parameters );
  70                 options.ajax = $.extend( {}, defaultOptions.ajax, options.ajax );
  71
  72                 this.defaults = options;
  73         };
  74
  75         mw.Api.prototype = {
  76
  77                 /**
  78                  * Normalize the ajax options for compatibility and/or convenience methods.
  79                  *
  80                  * @param {Object} [arg] An object contaning one or more of options.ajax.
  81                  * @return {Object} Normalized ajax options.
  82                  */
  83                 normalizeAjaxOptions: function ( arg ) {
  84                         // Arg argument is usually empty
  85                         // (before MW 1.20 it was used to pass ok callbacks)
  86                         var opts = arg || {};
  87                         // Options can also be a success callback handler
  88                         if ( typeof arg === 'function' ) {
  89                                 opts = { ok: arg };
  90                         }
  91                         return opts;
  92                 },
  93
  94                 /**
  95                  * Perform API get request
  96                  *
  97                  * @param {Object} parameters
  98                  * @param {Object|Function} [ajaxOptions]
  99                  * @return {jQuery.Promise}
 100                  */
 101                 get: function ( parameters, ajaxOptions ) {
 102                         ajaxOptions = this.normalizeAjaxOptions( ajaxOptions );
 103                         ajaxOptions.type = 'GET';
 104                         return this.ajax( parameters, ajaxOptions );
 105                 },
 106
 107                 /**
 108                  * Perform API post request
 109                  *
 110                  * TODO: Post actions for non-local hostnames will need proxy.
 111                  *
 112                  * @param {Object} parameters
 113                  * @param {Object|Function} [ajaxOptions]
 114                  * @return {jQuery.Promise}
 115                  */
 116                 post: function ( parameters, ajaxOptions ) {
 117                         ajaxOptions = this.normalizeAjaxOptions( ajaxOptions );
 118                         ajaxOptions.type = 'POST';
 119                         return this.ajax( parameters, ajaxOptions );
 120                 },
 121
 122                 /**
 123                  * Perform the API call.
 124                  *
 125                  * @param {Object} parameters
 126                  * @param {Object} [ajaxOptions]
 127                  * @return {jQuery.Promise} Done: API response data and the jqXHR object.
 128                  *  Fail: Error code
 129                  */
 130                 ajax: function ( parameters, ajaxOptions ) {
 131                         var token,
 132                                 apiDeferred = $.Deferred(),
 133                                 msg = 'Use of mediawiki.api callback params is deprecated. Use the Promise instead.',
 134                                 xhr, key, formData;
 135
 136                         parameters = $.extend( {}, this.defaults.parameters, parameters );
 137                         ajaxOptions = $.extend( {}, this.defaults.ajax, ajaxOptions );
 138
 139                         // Ensure that token parameter is last (per [[mw:API:Edit#Token]]).
 140                         if ( parameters.token ) {
 141                                 token = parameters.token;
 142                                 delete parameters.token;
 143                         }
 144
 145                         // If multipart/form-data has been requested and emulation is possible, emulate it
 146                         if (
 147                                 ajaxOptions.type === 'POST' &&
 148                                 window.FormData &&
 149                                 ajaxOptions.contentType === 'multipart/form-data'
 150                         ) {
 151
 152                                 formData = new FormData();
 153
 154                                 for ( key in parameters ) {
 155                                         formData.append( key, parameters[key] );
 156                                 }
 157                                 // If we extracted a token parameter, add it back in.
 158                                 if ( token ) {
 159                                         formData.append( 'token', token );
 160                                 }
 161
 162                                 ajaxOptions.data = formData;
 163
 164                                 // Prevent jQuery from mangling our FormData object
 165                                 ajaxOptions.processData = false;
 166                                 // Prevent jQuery from overriding the Content-Type header
 167                                 ajaxOptions.contentType = false;
 168                         } else {
 169                                 // Some deployed MediaWiki >= 1.17 forbid periods in URLs, due to an IE XSS bug
 170                                 // So let's escape them here. See bug #28235
 171                                 // This works because jQuery accepts data as a query string or as an Object
 172                                 ajaxOptions.data = $.param( parameters ).replace( /\./g, '%2E' );
 173
 174                                 // If we extracted a token parameter, add it back in.
 175                                 if ( token ) {
 176                                         ajaxOptions.data += '&token=' + encodeURIComponent( token );
 177                                 }
 178
 179                                 if ( ajaxOptions.contentType === 'multipart/form-data' ) {
 180                                         // We were asked to emulate but can't, so drop the Content-Type header, otherwise
 181                                         // it'll be wrong and the server will fail to decode the POST body
 182                                         delete ajaxOptions.contentType;
 183                                 }
 184                         }
 185
 186                         // Backwards compatibility: Before MediaWiki 1.20,
 187                         // callbacks were done with the 'ok' and 'err' property in ajaxOptions.
 188                         if ( ajaxOptions.ok ) {
 189                                 mw.track( 'mw.deprecate', 'api.cbParam' );
 190                                 mw.log.warn( msg );
 191                                 apiDeferred.done( ajaxOptions.ok );
 192                                 delete ajaxOptions.ok;
 193                         }
 194                         if ( ajaxOptions.err ) {
 195                                 mw.track( 'mw.deprecate', 'api.cbParam' );
 196                                 mw.log.warn( msg );
 197                                 apiDeferred.fail( ajaxOptions.err );
 198                                 delete ajaxOptions.err;
 199                         }
 200
 201                         // Make the AJAX request
 202                         xhr = $.ajax( ajaxOptions )
 203                                 // If AJAX fails, reject API call with error code 'http'
 204                                 // and details in second argument.
 205                                 .fail( function ( xhr, textStatus, exception ) {
 206                                         apiDeferred.reject( 'http', {
 207                                                 xhr: xhr,
 208                                                 textStatus: textStatus,
 209                                                 exception: exception
 210                                         } );
 211                                 } )
 212                                 // AJAX success just means "200 OK" response, also check API error codes
 213                                 .done( function ( result, textStatus, jqXHR ) {
 214                                         if ( result === undefined || result === null || result === '' ) {
 215                                                 apiDeferred.reject( 'ok-but-empty',
 216                                                         'OK response but empty result (check HTTP headers?)'
 217                                                 );
 218                                         } else if ( result.error ) {
 219                                                 var code = result.error.code === undefined ? 'unknown' : result.error.code;
 220                                                 apiDeferred.reject( code, result );
 221                                         } else {
 222                                                 apiDeferred.resolve( result, jqXHR );
 223                                         }
 224                                 } );
 225
 226                         // Return the Promise
 227                         return apiDeferred.promise( { abort: xhr.abort } ).fail( function ( code, details ) {
 228                                 if ( code !== 'abort' ) {
 229                                         mw.log( 'mw.Api error: ', code, details );
 230                                 }
 231                         } );
 232                 },
 233
 234                 /**
 235                  * Post to API with specified type of token. If we have no token, get one and try to post.
 236                  * If we have a cached token try using that, and if it fails, blank out the
 237                  * cached token and start over. For example to change an user option you could do:
 238                  *
 239                  *     new mw.Api().postWithToken( 'options', {
 240                  *         action: 'options',
 241                  *         optionname: 'gender',
 242                  *         optionvalue: 'female'
 243                  *     } );
 244                  *
 245                  * @param {string} tokenType The name of the token, like options or edit.
 246                  * @param {Object} params API parameters
 247                  * @param {Object} [ajaxOptions]
 248                  * @return {jQuery.Promise} See #post
 249                  * @since 1.22
 250                  */
 251                 postWithToken: function ( tokenType, params, ajaxOptions ) {
 252                         var api = this;
 253
 254                         // Do not allow deprecated ok-callback
 255                         // FIXME: Remove this check when the deprecated ok-callback is removed in #post
 256                         if ( $.isFunction( ajaxOptions ) ) {
 257                                 ajaxOptions = undefined;
 258                         }
 259
 260                         return api.getToken( tokenType ).then( function ( token ) {
 261                                 params.token = token;
 262                                 return api.post( params, ajaxOptions ).then(
 263                                         // If no error, return to caller as-is
 264                                         null,
 265                                         // Error handler
 266                                         function ( code ) {
 267                                                 if ( code === 'badtoken' ) {
 268                                                         // Clear from cache
 269                                                         promises[ api.defaults.ajax.url ][ tokenType + 'Token' ] =
 270                                                                 params.token = undefined;
 271
 272                                                         // Try again, once
 273                                                         return api.getToken( tokenType ).then( function ( token ) {
 274                                                                 params.token = token;
 275                                                                 return api.post( params, ajaxOptions );
 276                                                         } );
 277                                                 }
 278
 279                                                 // Different error, pass on to let caller handle the error code
 280                                                 return this;
 281                                         }
 282                                 );
 283                         } );
 284                 },
 285
 286                 /**
 287                  * Get a token for a certain action from the API.
 288                  *
 289                  * @param {string} type Token type
 290                  * @return {jQuery.Promise}
 291                  * @return {Function} return.done
 292                  * @return {string} return.done.token Received token.
 293                  * @since 1.22
 294                  */
 295                 getToken: function ( type ) {
 296                         var apiPromise,
 297                                 promiseGroup = promises[ this.defaults.ajax.url ],
 298                                 d = promiseGroup && promiseGroup[ type + 'Token' ];
 299
 300                         if ( !d ) {
 301                                 apiPromise = this.get( { action: 'tokens', type: type } );
 302
 303                                 d = apiPromise
 304                                         .then( function ( data ) {
 305                                                 // If token type is not available for this user,
 306                                                 // key '...token' is either missing or set to boolean false
 307                                                 if ( data.tokens && data.tokens[type + 'token'] ) {
 308                                                         return data.tokens[type + 'token'];
 309                                                 }
 310
 311                                                 return $.Deferred().reject( 'token-missing', data );
 312                                         }, function () {
 313                                                 // Clear promise. Do not cache errors.
 314                                                 delete promiseGroup[ type + 'Token' ];
 315
 316                                                 // Pass on to allow the caller to handle the error
 317                                                 return this;
 318                                         } )
 319                                         // Attach abort handler
 320                                         .promise( { abort: apiPromise.abort } );
 321
 322                                 // Store deferred now so that we can use it again even if it isn't ready yet
 323                                 if ( !promiseGroup ) {
 324                                         promiseGroup = promises[ this.defaults.ajax.url ] = {};
 325                                 }
 326                                 promiseGroup[ type + 'Token' ] = d;
 327                         }
 328
 329                         return d;
 330                 }
 331         };
 332
 333         /**
 334          * @static
 335          * @property {Array}
 336          * List of errors we might receive from the API.
 337          * For now, this just documents our expectation that there should be similar messages
 338          * available.
 339          */
 340         mw.Api.errors = [
 341                 // occurs when POST aborted
 342                 // jQuery 1.4 can't distinguish abort or lost connection from 200 OK + empty result
 343                 'ok-but-empty',
 344
 345                 // timeout
 346                 'timeout',
 347
 348                 // really a warning, but we treat it like an error
 349                 'duplicate',
 350                 'duplicate-archive',
 351
 352                 // upload succeeded, but no image info.
 353                 // this is probably impossible, but might as well check for it
 354                 'noimageinfo',
 355                 // remote errors, defined in API
 356                 'uploaddisabled',
 357                 'nomodule',
 358                 'mustbeposted',
 359                 'badaccess-groups',
 360                 'stashfailed',
 361                 'missingresult',
 362                 'missingparam',
 363                 'invalid-file-key',
 364                 'copyuploaddisabled',
 365                 'mustbeloggedin',
 366                 'empty-file',
 367                 'file-too-large',
 368                 'filetype-missing',
 369                 'filetype-banned',
 370                 'filetype-banned-type',
 371                 'filename-tooshort',
 372                 'illegal-filename',
 373                 'verification-error',
 374                 'hookaborted',
 375                 'unknown-error',
 376                 'internal-error',
 377                 'overwrite',
 378                 'badtoken',
 379                 'fetchfileerror',
 380                 'fileexists-shared-forbidden',
 381                 'invalidtitle',
 382                 'notloggedin'
 383         ];
 384
 385         /**
 386          * @static
 387          * @property {Array}
 388          * List of warnings we might receive from the API.
 389          * For now, this just documents our expectation that there should be similar messages
 390          * available.
 391          */
 392         mw.Api.warnings = [
 393                 'duplicate',
 394                 'exists'
 395         ];
 396
 397 }( mediaWiki, jQuery ) );