resources/src/mediawiki.rcfilters/mw.rcfilters.Controller.js

   1 ( function ( mw, $ ) {
   2         /* eslint no-underscore-dangle: "off" */
   3         /**
   4          * Controller for the filters in Recent Changes
   5          *
   6          * @param {mw.rcfilters.dm.FiltersViewModel} filtersModel Filters view model
   7          * @param {mw.rcfilters.dm.ChangesListViewModel} changesListModel Changes list view model
   8          * @param {mw.rcfilters.dm.SavedQueriesModel} savedQueriesModel Saved queries model
   9          */
  10         mw.rcfilters.Controller = function MwRcfiltersController( filtersModel, changesListModel, savedQueriesModel ) {
  11                 this.filtersModel = filtersModel;
  12                 this.changesListModel = changesListModel;
  13                 this.savedQueriesModel = savedQueriesModel;
  14                 this.requestCounter = 0;
  15                 this.baseState = {};
  16         };
  17
  18         /* Initialization */
  19         OO.initClass( mw.rcfilters.Controller );
  20
  21         /**
  22          * Initialize the filter and parameter states
  23          *
  24          * @param {Array} filterStructure Filter definition and structure for the model
  25          */
  26         mw.rcfilters.Controller.prototype.initialize = function ( filterStructure ) {
  27                 var parsedSavedQueries,
  28                         $changesList = $( '.mw-changeslist' ).first().contents();
  29                 // Initialize the model
  30                 this.filtersModel.initializeFilters( filterStructure );
  31
  32                 this._buildBaseFilterState();
  33
  34                 try {
  35                         parsedSavedQueries = JSON.parse( mw.user.options.get( 'rcfilters-saved-queries' ) || '{}' );
  36                 } catch ( err ) {
  37                         parsedSavedQueries = {};
  38                 }
  39
  40                 // The queries are saved in a minimized state, so we need
  41                 // to send over the base state so the saved queries model
  42                 // can normalize them per each query item
  43                 this.savedQueriesModel.initialize(
  44                         parsedSavedQueries,
  45                         this._getBaseState()
  46                 );
  47                 this.updateStateBasedOnUrl();
  48
  49                 // Update the changes list with the existing data
  50                 // so it gets processed
  51                 this.changesListModel.update(
  52                         $changesList.length ? $changesList : 'NO_RESULTS',
  53                         $( 'fieldset.rcoptions' ).first()
  54                 );
  55         };
  56
  57         /**
  58          * Reset to default filters
  59          */
  60         mw.rcfilters.Controller.prototype.resetToDefaults = function () {
  61                 this._updateModelState( this._getDefaultParams() );
  62                 this.updateChangesList();
  63         };
  64
  65         /**
  66          * Empty all selected filters
  67          */
  68         mw.rcfilters.Controller.prototype.emptyFilters = function () {
  69                 var highlightedFilterNames = this.filtersModel
  70                         .getHighlightedItems()
  71                         .map( function ( filterItem ) { return { name: filterItem.getName() }; } );
  72
  73                 this.filtersModel.emptyAllFilters();
  74                 this.filtersModel.clearAllHighlightColors();
  75                 // Check all filter interactions
  76                 this.filtersModel.reassessFilterInteractions();
  77
  78                 this.updateChangesList();
  79
  80                 if ( highlightedFilterNames ) {
  81                         this._trackHighlight( 'clearAll', highlightedFilterNames );
  82                 }
  83         };
  84
  85         /**
  86          * Update the selected state of a filter
  87          *
  88          * @param {string} filterName Filter name
  89          * @param {boolean} [isSelected] Filter selected state
  90          */
  91         mw.rcfilters.Controller.prototype.toggleFilterSelect = function ( filterName, isSelected ) {
  92                 var filterItem = this.filtersModel.getItemByName( filterName );
  93
  94                 if ( !filterItem ) {
  95                         // If no filter was found, break
  96                         return;
  97                 }
  98
  99                 isSelected = isSelected === undefined ? !filterItem.isSelected() : isSelected;
 100
 101                 if ( filterItem.isSelected() !== isSelected ) {
 102                         this.filtersModel.toggleFilterSelected( filterName, isSelected );
 103
 104                         this.updateChangesList();
 105
 106                         // Check filter interactions
 107                         this.filtersModel.reassessFilterInteractions( filterItem );
 108                 }
 109         };
 110
 111         /**
 112          * Clear both highlight and selection of a filter
 113          *
 114          * @param {string} filterName Name of the filter item
 115          */
 116         mw.rcfilters.Controller.prototype.clearFilter = function ( filterName ) {
 117                 var filterItem = this.filtersModel.getItemByName( filterName ),
 118                         isHighlighted = filterItem.isHighlighted();
 119
 120                 if ( filterItem.isSelected() || isHighlighted ) {
 121                         this.filtersModel.clearHighlightColor( filterName );
 122                         this.filtersModel.toggleFilterSelected( filterName, false );
 123                         this.updateChangesList();
 124                         this.filtersModel.reassessFilterInteractions( filterItem );
 125                 }
 126
 127                 if ( isHighlighted ) {
 128                         this._trackHighlight( 'clear', filterName );
 129                 }
 130         };
 131
 132         /**
 133          * Toggle the highlight feature on and off
 134          */
 135         mw.rcfilters.Controller.prototype.toggleHighlight = function () {
 136                 this.filtersModel.toggleHighlight();
 137                 this._updateURL();
 138
 139                 if ( this.filtersModel.isHighlightEnabled() ) {
 140                         mw.hook( 'RcFilters.highlight.enable' ).fire();
 141                 }
 142         };
 143
 144         /**
 145          * Set the highlight color for a filter item
 146          *
 147          * @param {string} filterName Name of the filter item
 148          * @param {string} color Selected color
 149          */
 150         mw.rcfilters.Controller.prototype.setHighlightColor = function ( filterName, color ) {
 151                 this.filtersModel.setHighlightColor( filterName, color );
 152                 this._updateURL();
 153                 this._trackHighlight( 'set', { name: filterName, color: color } );
 154         };
 155
 156         /**
 157          * Clear highlight for a filter item
 158          *
 159          * @param {string} filterName Name of the filter item
 160          */
 161         mw.rcfilters.Controller.prototype.clearHighlightColor = function ( filterName ) {
 162                 this.filtersModel.clearHighlightColor( filterName );
 163                 this._updateURL();
 164                 this._trackHighlight( 'clear', filterName );
 165         };
 166
 167         /**
 168          * Save the current model state as a saved query
 169          *
 170          * @param {string} [label] Label of the saved query
 171          */
 172         mw.rcfilters.Controller.prototype.saveCurrentQuery = function ( label ) {
 173                 var highlightedItems = {},
 174                         highlightEnabled = this.filtersModel.isHighlightEnabled();
 175
 176                 // Prepare highlights
 177                 this.filtersModel.getHighlightedItems().forEach( function ( item ) {
 178                         highlightedItems[ item.getName() ] = highlightEnabled ?
 179                                 item.getHighlightColor() : null;
 180                 } );
 181                 highlightedItems.highlights = this.filtersModel.isHighlightEnabled();
 182
 183                 // Add item
 184                 this.savedQueriesModel.addNewQuery(
 185                         label || mw.msg( 'rcfilters-savedqueries-defaultlabel' ),
 186                         {
 187                                 filters: this.filtersModel.getSelectedState(),
 188                                 highlights: highlightedItems
 189                         }
 190                 );
 191
 192                 // Save item
 193                 this._saveSavedQueries();
 194         };
 195
 196         /**
 197          * Remove a saved query
 198          *
 199          * @param {string} queryID Query id
 200          */
 201         mw.rcfilters.Controller.prototype.removeSavedQuery = function ( queryID ) {
 202                 var query = this.savedQueriesModel.getItemByID( queryID );
 203
 204                 this.savedQueriesModel.removeItems( [ query ] );
 205
 206                 // Check if this item was the default
 207                 if ( this.savedQueriesModel.getDefault() === queryID ) {
 208                         // Nulify the default
 209                         this.savedQueriesModel.setDefault( null );
 210                 }
 211                 this._saveSavedQueries();
 212         };
 213
 214         /**
 215          * Rename a saved query
 216          *
 217          * @param {string} queryID Query id
 218          * @param {string} newLabel New label for the query
 219          */
 220         mw.rcfilters.Controller.prototype.renameSavedQuery = function ( queryID, newLabel ) {
 221                 var queryItem = this.savedQueriesModel.getItemByID( queryID );
 222
 223                 if ( queryItem ) {
 224                         queryItem.updateLabel( newLabel );
 225                 }
 226                 this._saveSavedQueries();
 227         };
 228
 229         /**
 230          * Set a saved query as default
 231          *
 232          * @param {string} queryID Query Id. If null is given, default
 233          *  query is reset.
 234          */
 235         mw.rcfilters.Controller.prototype.setDefaultSavedQuery = function ( queryID ) {
 236                 this.savedQueriesModel.setDefault( queryID );
 237                 this._saveSavedQueries();
 238         };
 239
 240         /**
 241          * Load a saved query
 242          *
 243          * @param {string} queryID Query id
 244          */
 245         mw.rcfilters.Controller.prototype.applySavedQuery = function ( queryID ) {
 246                 var data, highlights,
 247                         queryItem = this.savedQueriesModel.getItemByID( queryID );
 248
 249                 if ( queryItem ) {
 250                         data = queryItem.getData();
 251                         highlights = data.highlights;
 252
 253                         // Update model state from filters
 254                         this.filtersModel.toggleFiltersSelected( data.filters );
 255
 256                         // Update highlight state
 257                         this.filtersModel.toggleHighlight( !!highlights.highlights );
 258                         this.filtersModel.getItems().forEach( function ( filterItem ) {
 259                                 var color = highlights[ filterItem.getName() ];
 260                                 if ( color ) {
 261                                         filterItem.setHighlightColor( color );
 262                                 } else {
 263                                         filterItem.clearHighlightColor();
 264                                 }
 265                         } );
 266
 267                         // Check all filter interactions
 268                         this.filtersModel.reassessFilterInteractions();
 269
 270                         this.updateChangesList();
 271                 }
 272         };
 273
 274         /**
 275          * Check whether the current filter and highlight state exists
 276          * in the saved queries model.
 277          *
 278          * @return {boolean} Query exists
 279          */
 280         mw.rcfilters.Controller.prototype.findQueryMatchingCurrentState = function () {
 281                 var highlightedItems = {};
 282
 283                 // Prepare highlights of the current query
 284                 this.filtersModel.getItemsSupportingHighlights().forEach( function ( item ) {
 285                         highlightedItems[ item.getName() ] = item.getHighlightColor();
 286                 } );
 287                 highlightedItems.highlights = this.filtersModel.isHighlightEnabled();
 288
 289                 return this.savedQueriesModel.findMatchingQuery(
 290                         {
 291                                 filters: this.filtersModel.getSelectedState(),
 292                                 highlights: highlightedItems
 293                         }
 294                 );
 295         };
 296
 297         /**
 298          * Get an object representing the base state of parameters
 299          * and highlights.
 300          *
 301          * This is meant to make sure that the saved queries that are
 302          * in memory are always the same structure as what we would get
 303          * by calling the current model's "getSelectedState" and by checking
 304          * highlight items.
 305          *
 306          * In cases where a user saved a query when the system had a certain
 307          * set of filters, and then a filter was added to the system, we want
 308          * to make sure that the stored queries can still be comparable to
 309          * the current state, which means that we need the base state for
 310          * two operations:
 311          *
 312          * - Saved queries are stored in "minimal" view (only changed filters
 313          *   are stored); When we initialize the system, we merge each minimal
 314          *   query with the base state (using 'getNormalizedFilters') so all
 315          *   saved queries have the exact same structure as what we would get
 316          *   by checking the getSelectedState of the filter.
 317          * - When we save the queries, we minimize the object to only represent
 318          *   whatever has actually changed, rather than store the entire
 319          *   object. To check what actually is different so we can store it,
 320          *   we need to obtain a base state to compare against, this is
 321          *   what #_getMinimalFilterList does
 322          */
 323         mw.rcfilters.Controller.prototype._buildBaseFilterState = function () {
 324                 var defaultParams = this.filtersModel.getDefaultParams(),
 325                         highlightedItems = {};
 326
 327                 // Prepare highlights
 328                 this.filtersModel.getItemsSupportingHighlights().forEach( function ( item ) {
 329                         highlightedItems[ item.getName() ] = null;
 330                 } );
 331                 highlightedItems.highlights = false;
 332
 333                 this.baseState = {
 334                         filters: this.filtersModel.getFiltersFromParameters( defaultParams ),
 335                         highlights: highlightedItems
 336                 };
 337         };
 338
 339         /**
 340          * Get an object representing the base state of parameters
 341          * and highlights. The structure is similar to what we use
 342          * to store each query in the saved queries object:
 343          * {
 344          *    filters: {
 345          *        filterName: (bool)
 346          *    },
 347          *    highlights: {
 348          *        filterName: (string|null)
 349          *    }
 350          * }
 351          *
 352          * @return {Object} Object representing the base state of
 353          *  parameters and highlights
 354          */
 355         mw.rcfilters.Controller.prototype._getBaseState = function () {
 356                 return this.baseState;
 357         };
 358
 359         /**
 360          * Get an object that holds only the parameters and highlights that have
 361          * values different than the base default value.
 362          *
 363          * This is the reverse of the normalization we do initially on loading and
 364          * initializing the saved queries model.
 365          *
 366          * @param {Object} valuesObject Object representing the state of both
 367          *  filters and highlights in its normalized version, to be minimized.
 368          * @return {Object} Minimal filters and highlights list
 369          */
 370         mw.rcfilters.Controller.prototype._getMinimalFilterList = function ( valuesObject ) {
 371                 var result = { filters: {}, highlights: {} },
 372                         baseState = this._getBaseState();
 373
 374                 // XOR results
 375                 $.each( valuesObject.filters, function ( name, value ) {
 376                         if ( baseState.filters !== undefined && baseState.filters[ name ] !== value ) {
 377                                 result.filters[ name ] = value;
 378                         }
 379                 } );
 380
 381                 $.each( valuesObject.highlights, function ( name, value ) {
 382                         if ( baseState.highlights !== undefined && baseState.highlights[ name ] !== value ) {
 383                                 result.highlights[ name ] = value;
 384                         }
 385                 } );
 386
 387                 return result;
 388         };
 389
 390         /**
 391          * Save the current state of the saved queries model with all
 392          * query item representation in the user settings.
 393          */
 394         mw.rcfilters.Controller.prototype._saveSavedQueries = function () {
 395                 var stringified,
 396                         state = this.savedQueriesModel.getState(),
 397                         controller = this;
 398
 399                 // Minimize before save
 400                 $.each( state.queries, function ( queryID, info ) {
 401                         state.queries[ queryID ].data = controller._getMinimalFilterList( info.data );
 402                 } );
 403
 404                 // Stringify state
 405                 stringified = JSON.stringify( state );
 406
 407                 if ( stringified.length > 65535 ) {
 408                         // Sanity check, since the preference can only hold that.
 409                         return;
 410                 }
 411
 412                 // Save the preference
 413                 new mw.Api().saveOption( 'rcfilters-saved-queries', stringified );
 414                 // Update the preference for this session
 415                 mw.user.options.set( 'rcfilters-saved-queries', stringified );
 416         };
 417
 418         /**
 419          * Synchronize the URL with the current state of the filters
 420          * without adding an history entry.
 421          */
 422         mw.rcfilters.Controller.prototype.replaceUrl = function () {
 423                 window.history.replaceState(
 424                         { tag: 'rcfilters' },
 425                         document.title,
 426                         this._getUpdatedUri().toString()
 427                 );
 428         };
 429
 430         /**
 431          * Update filter state (selection and highlighting) based
 432          * on current URL and default values.
 433          */
 434         mw.rcfilters.Controller.prototype.updateStateBasedOnUrl = function () {
 435                 var uri = new mw.Uri(),
 436                         defaultParams = this._getDefaultParams();
 437
 438                 this._updateModelState( $.extend( {}, defaultParams, uri.query ) );
 439                 this.updateChangesList();
 440         };
 441
 442         /**
 443          * Update the list of changes and notify the model
 444          *
 445          * @param {Object} [params] Extra parameters to add to the API call
 446          */
 447         mw.rcfilters.Controller.prototype.updateChangesList = function ( params ) {
 448                 this._updateURL( params );
 449                 this.changesListModel.invalidate();
 450                 this._fetchChangesList()
 451                         .then(
 452                                 // Success
 453                                 function ( pieces ) {
 454                                         var $changesListContent = pieces.changes,
 455                                                 $fieldset = pieces.fieldset;
 456                                         this.changesListModel.update( $changesListContent, $fieldset );
 457                                 }.bind( this )
 458                                 // Do nothing for failure
 459                         );
 460         };
 461
 462         /**
 463          * Update the model state from given the given parameters.
 464          *
 465          * This is an internal method, and should only be used from inside
 466          * the controller.
 467          *
 468          * @param {Object} parameters Object representing the parameters for
 469          *  filters and highlights
 470          */
 471         mw.rcfilters.Controller.prototype._updateModelState = function ( parameters ) {
 472                 // Update filter states
 473                 this.filtersModel.toggleFiltersSelected(
 474                         this.filtersModel.getFiltersFromParameters(
 475                                 parameters
 476                         )
 477                 );
 478
 479                 // Update highlight state
 480                 this.filtersModel.toggleHighlight( !!parameters.highlights );
 481                 this.filtersModel.getItems().forEach( function ( filterItem ) {
 482                         var color = parameters[ filterItem.getName() + '_color' ];
 483                         if ( color ) {
 484                                 filterItem.setHighlightColor( color );
 485                         } else {
 486                                 filterItem.clearHighlightColor();
 487                         }
 488                 } );
 489
 490                 // Check all filter interactions
 491                 this.filtersModel.reassessFilterInteractions();
 492         };
 493
 494         /**
 495          * Get an object representing the default parameter state, whether
 496          * it is from the model defaults or from the saved queries.
 497          *
 498          * @return {Object} Default parameters
 499          */
 500         mw.rcfilters.Controller.prototype._getDefaultParams = function () {
 501                 var data, queryHighlights,
 502                         savedParams = {},
 503                         savedHighlights = {},
 504                         defaultSavedQueryItem = this.savedQueriesModel.getItemByID( this.savedQueriesModel.getDefault() );
 505
 506                 if ( mw.config.get( 'wgStructuredChangeFiltersEnableSaving' ) &&
 507                         defaultSavedQueryItem ) {
 508
 509                         data = defaultSavedQueryItem.getData();
 510
 511                         queryHighlights = data.highlights || {};
 512                         savedParams = this.filtersModel.getParametersFromFilters( data.filters || {} );
 513
 514                         // Translate highlights to parameters
 515                         savedHighlights.highlights = queryHighlights.highlights;
 516                         $.each( queryHighlights, function ( filterName, color ) {
 517                                 if ( filterName !== 'highlights' ) {
 518                                         savedHighlights[ filterName + '_color' ] = color;
 519                                 }
 520                         } );
 521
 522                         return $.extend( true, {}, savedParams, savedHighlights );
 523                 }
 524
 525                 return this.filtersModel.getDefaultParams();
 526         };
 527
 528         /**
 529          * Update the URL of the page to reflect current filters
 530          *
 531          * This should not be called directly from outside the controller.
 532          * If an action requires changing the URL, it should either use the
 533          * highlighting actions below, or call #updateChangesList which does
 534          * the uri corrections already.
 535          *
 536          * @param {Object} [params] Extra parameters to add to the API call
 537          */
 538         mw.rcfilters.Controller.prototype._updateURL = function ( params ) {
 539                 var updatedUri,
 540                         notEquivalent = function ( obj1, obj2 ) {
 541                                 var keys = Object.keys( obj1 ).concat( Object.keys( obj2 ) );
 542                                 return keys.some( function ( key ) {
 543                                         return obj1[ key ] != obj2[ key ]; // eslint-disable-line eqeqeq
 544                                 } );
 545                         };
 546
 547                 params = params || {};
 548
 549                 updatedUri = this._getUpdatedUri();
 550                 updatedUri.extend( params );
 551
 552                 if ( notEquivalent( updatedUri.query, new mw.Uri().query ) ) {
 553                         window.history.pushState( { tag: 'rcfilters' }, document.title, updatedUri.toString() );
 554                 }
 555         };
 556
 557         /**
 558          * Get an updated mw.Uri object based on the model state
 559          *
 560          * @return {mw.Uri} Updated Uri
 561          */
 562         mw.rcfilters.Controller.prototype._getUpdatedUri = function () {
 563                 var uri = new mw.Uri(),
 564                         highlightParams = this.filtersModel.getHighlightParameters();
 565
 566                 // Add to existing queries in URL
 567                 // TODO: Clean up the list of filters; perhaps 'falsy' filters
 568                 // shouldn't appear at all? Or compare to existing query string
 569                 // and see if current state of a specific filter is needed?
 570                 uri.extend( this.filtersModel.getParametersFromFilters() );
 571
 572                 // highlight params
 573                 Object.keys( highlightParams ).forEach( function ( paramName ) {
 574                         if ( highlightParams[ paramName ] ) {
 575                                 uri.query[ paramName ] = highlightParams[ paramName ];
 576                         } else {
 577                                 delete uri.query[ paramName ];
 578                         }
 579                 } );
 580
 581                 return uri;
 582         };
 583
 584         /**
 585          * Fetch the list of changes from the server for the current filters
 586          *
 587          * @return {jQuery.Promise} Promise object that will resolve with the changes list
 588          *  or with a string denoting no results.
 589          */
 590         mw.rcfilters.Controller.prototype._fetchChangesList = function () {
 591                 var uri = this._getUpdatedUri(),
 592                         requestId = ++this.requestCounter,
 593                         latestRequest = function () {
 594                                 return requestId === this.requestCounter;
 595                         }.bind( this );
 596
 597                 return $.ajax( uri.toString(), { contentType: 'html' } )
 598                         .then(
 599                                 // Success
 600                                 function ( html ) {
 601                                         var $parsed;
 602                                         if ( !latestRequest() ) {
 603                                                 return $.Deferred().reject();
 604                                         }
 605
 606                                         $parsed = $( $.parseHTML( html ) );
 607
 608                                         return {
 609                                                 // Changes list
 610                                                 changes: $parsed.find( '.mw-changeslist' ).first().contents(),
 611                                                 // Fieldset
 612                                                 fieldset: $parsed.find( 'fieldset.rcoptions' ).first()
 613                                         };
 614                                 },
 615                                 // Failure
 616                                 function ( responseObj ) {
 617                                         var $parsed;
 618
 619                                         if ( !latestRequest() ) {
 620                                                 return $.Deferred().reject();
 621                                         }
 622
 623                                         $parsed = $( $.parseHTML( responseObj.responseText ) );
 624
 625                                         // Force a resolve state to this promise
 626                                         return $.Deferred().resolve( {
 627                                                 changes: 'NO_RESULTS',
 628                                                 fieldset: $parsed.find( 'fieldset.rcoptions' ).first()
 629                                         } ).promise();
 630                                 }
 631                         );
 632         };
 633
 634         /**
 635          * Track usage of highlight feature
 636          *
 637          * @param {string} action
 638          * @param {array|object|string} filters
 639          */
 640         mw.rcfilters.Controller.prototype._trackHighlight = function ( action, filters ) {
 641                 filters = typeof filters === 'string' ? { name: filters } : filters;
 642                 filters = !Array.isArray( filters ) ? [ filters ] : filters;
 643                 mw.track(
 644                         'event.ChangesListHighlights',
 645                         {
 646                                 action: action,
 647                                 filters: filters,
 648                                 userId: mw.user.getId()
 649                         }
 650                 );
 651         };
 652
 653 }( mediaWiki, jQuery ) );