1/**
  2 * @output wp-includes/js/wp-api.js
  3 */
  4
  5(function( window, undefined ) {
  6
  7	'use strict';
  8
  9	/**
 10	 * Initialize the WP_API.
 11	 */
 12	function WP_API() {
 13		/** @namespace wp.api.models */
 14		this.models = {};
 15		/** @namespace wp.api.collections */
 16		this.collections = {};
 17		/** @namespace wp.api.views */
 18		this.views = {};
 19	}
 20
 21	/** @namespace wp */
 22	window.wp            = window.wp || {};
 23	/** @namespace wp.api */
 24	wp.api               = wp.api || new WP_API();
 25	wp.api.versionString = wp.api.versionString || 'wp/v2/';
 26
 27	// Alias _includes to _.contains, ensuring it is available if lodash is used.
 28	if ( ! _.isFunction( _.includes ) && _.isFunction( _.contains ) ) {
 29	  _.includes = _.contains;
 30	}
 31
 32})( window );
 33
 34(function( window, undefined ) {
 35
 36	'use strict';
 37
 38	var pad, r;
 39
 40	/** @namespace wp */
 41	window.wp = window.wp || {};
 42	/** @namespace wp.api */
 43	wp.api = wp.api || {};
 44	/** @namespace wp.api.utils */
 45	wp.api.utils = wp.api.utils || {};
 46
 47	/**
 48	 * Determine model based on API route.
 49	 *
 50	 * @param {string} route    The API route.
 51	 *
 52	 * @return {Backbone Model} The model found at given route. Undefined if not found.
 53	 */
 54	wp.api.getModelByRoute = function( route ) {
 55		return _.find( wp.api.models, function( model ) {
 56			return model.prototype.route && route === model.prototype.route.index;
 57		} );
 58	};
 59
 60	/**
 61	 * Determine collection based on API route.
 62	 *
 63	 * @param {string} route    The API route.
 64	 *
 65	 * @return {Backbone Model} The collection found at given route. Undefined if not found.
 66	 */
 67	wp.api.getCollectionByRoute = function( route ) {
 68		return _.find( wp.api.collections, function( collection ) {
 69			return collection.prototype.route && route === collection.prototype.route.index;
 70		} );
 71	};
 72
 73
 74	/**
 75	 * ECMAScript 5 shim, adapted from MDN.
 76	 * @link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toISOString
 77	 */
 78	if ( ! Date.prototype.toISOString ) {
 79		pad = function( number ) {
 80			r = String( number );
 81			if ( 1 === r.length ) {
 82				r = '0' + r;
 83			}
 84
 85			return r;
 86		};
 87
 88		Date.prototype.toISOString = function() {
 89			return this.getUTCFullYear() +
 90				'-' + pad( this.getUTCMonth() + 1 ) +
 91				'-' + pad( this.getUTCDate() ) +
 92				'T' + pad( this.getUTCHours() ) +
 93				':' + pad( this.getUTCMinutes() ) +
 94				':' + pad( this.getUTCSeconds() ) +
 95				'.' + String( ( this.getUTCMilliseconds() / 1000 ).toFixed( 3 ) ).slice( 2, 5 ) +
 96				'Z';
 97		};
 98	}
 99
100	/**
101	 * Parse date into ISO8601 format.
102	 *
103	 * @param {Date} date.
104	 */
105	wp.api.utils.parseISO8601 = function( date ) {
106		var timestamp, struct, i, k,
107			minutesOffset = 0,
108			numericKeys = [ 1, 4, 5, 6, 7, 10, 11 ];
109
110		/*
111		 * ES5 §15.9.4.2 states that the string should attempt to be parsed as a Date Time String Format string
112		 * before falling back to any implementation-specific date parsing, so that’s what we do, even if native
113		 * implementations could be faster.
114		 */
115		//              1 YYYY                2 MM       3 DD           4 HH    5 mm       6 ss        7 msec        8 Z 9 ±    10 tzHH    11 tzmm
116		if ( ( struct = /^(\d{4}|[+\-]\d{6})(?:-(\d{2})(?:-(\d{2}))?)?(?:T(\d{2}):(\d{2})(?::(\d{2})(?:\.(\d{3}))?)?(?:(Z)|([+\-])(\d{2})(?::(\d{2}))?)?)?$/.exec( date ) ) ) {
117
118			// Avoid NaN timestamps caused by “undefined” values being passed to Date.UTC.
119			for ( i = 0; ( k = numericKeys[i] ); ++i ) {
120				struct[k] = +struct[k] || 0;
121			}
122
123			// Allow undefined days and months.
124			struct[2] = ( +struct[2] || 1 ) - 1;
125			struct[3] = +struct[3] || 1;
126
127			if ( 'Z' !== struct[8]  && undefined !== struct[9] ) {
128				minutesOffset = struct[10] * 60 + struct[11];
129
130				if ( '+' === struct[9] ) {
131					minutesOffset = 0 - minutesOffset;
132				}
133			}
134
135			timestamp = Date.UTC( struct[1], struct[2], struct[3], struct[4], struct[5] + minutesOffset, struct[6], struct[7] );
136		} else {
137			timestamp = Date.parse ? Date.parse( date ) : NaN;
138		}
139
140		return timestamp;
141	};
142
143	/**
144	 * Helper function for getting the root URL.
145	 * @return {[type]} [description]
146	 */
147	wp.api.utils.getRootUrl = function() {
148		return window.location.origin ?
149			window.location.origin + '/' :
150			window.location.protocol + '//' + window.location.host + '/';
151	};
152
153	/**
154	 * Helper for capitalizing strings.
155	 */
156	wp.api.utils.capitalize = function( str ) {
157		if ( _.isUndefined( str ) ) {
158			return str;
159		}
160		return str.charAt( 0 ).toUpperCase() + str.slice( 1 );
161	};
162
163	/**
164	 * Helper function that capitalizes the first word and camel cases any words starting
165	 * after dashes, removing the dashes.
166	 */
167	wp.api.utils.capitalizeAndCamelCaseDashes = function( str ) {
168		if ( _.isUndefined( str ) ) {
169			return str;
170		}
171		str = wp.api.utils.capitalize( str );
172
173		return wp.api.utils.camelCaseDashes( str );
174	};
175
176	/**
177	 * Helper function to camel case the letter after dashes, removing the dashes.
178	 */
179	wp.api.utils.camelCaseDashes = function( str ) {
180		return str.replace( /-([a-z])/g, function( g ) {
181			return g[ 1 ].toUpperCase();
182		} );
183	};
184
185	/**
186	 * Extract a route part based on negative index.
187	 *
188	 * @param {string}   route          The endpoint route.
189	 * @param {number}   part           The number of parts from the end of the route to retrieve. Default 1.
190	 *                                  Example route `/a/b/c`: part 1 is `c`, part 2 is `b`, part 3 is `a`.
191	 * @param {string}  [versionString] Version string, defaults to `wp.api.versionString`.
192	 * @param {boolean} [reverse]       Whether to reverse the order when extracting the route part. Optional, default false.
193	 */
194	wp.api.utils.extractRoutePart = function( route, part, versionString, reverse ) {
195		var routeParts;
196
197		part = part || 1;
198		versionString = versionString || wp.api.versionString;
199
200		// Remove versions string from route to avoid returning it.
201		if ( 0 === route.indexOf( '/' + versionString ) ) {
202			route = route.substr( versionString.length + 1 );
203		}
204
205		routeParts = route.split( '/' );
206		if ( reverse ) {
207			routeParts = routeParts.reverse();
208		}
209		if ( _.isUndefined( routeParts[ --part ] ) ) {
210			return '';
211		}
212		return routeParts[ part ];
213	};
214
215	/**
216	 * Extract a parent name from a passed route.
217	 *
218	 * @param {string} route The route to extract a name from.
219	 */
220	wp.api.utils.extractParentName = function( route ) {
221		var name,
222			lastSlash = route.lastIndexOf( '_id>[\\d]+)/' );
223
224		if ( lastSlash < 0 ) {
225			return '';
226		}
227		name = route.substr( 0, lastSlash - 1 );
228		name = name.split( '/' );
229		name.pop();
230		name = name.pop();
231		return name;
232	};
233
234	/**
235	 * Add args and options to a model prototype from a route's endpoints.
236	 *
237	 * @param {Array}  routeEndpoints Array of route endpoints.
238	 * @param {Object} modelInstance  An instance of the model (or collection)
239	 *                                to add the args to.
240	 */
241	wp.api.utils.decorateFromRoute = function( routeEndpoints, modelInstance ) {
242
243		/**
244		 * Build the args based on route endpoint data.
245		 */
246		_.each( routeEndpoints, function( routeEndpoint ) {
247
248			// Add post and edit endpoints as model args.
249			if ( _.includes( routeEndpoint.methods, 'POST' ) || _.includes( routeEndpoint.methods, 'PUT' ) ) {
250
251				// Add any non-empty args, merging them into the args object.
252				if ( ! _.isEmpty( routeEndpoint.args ) ) {
253
254					// Set as default if no args yet.
255					if ( _.isEmpty( modelInstance.prototype.args ) ) {
256						modelInstance.prototype.args = routeEndpoint.args;
257					} else {
258
259						// We already have args, merge these new args in.
260						modelInstance.prototype.args = _.extend( modelInstance.prototype.args, routeEndpoint.args );
261					}
262				}
263			} else {
264
265				// Add GET method as model options.
266				if ( _.includes( routeEndpoint.methods, 'GET' ) ) {
267
268					// Add any non-empty args, merging them into the defaults object.
269					if ( ! _.isEmpty( routeEndpoint.args ) ) {
270
271						// Set as default if no defaults yet.
272						if ( _.isEmpty( modelInstance.prototype.options ) ) {
273							modelInstance.prototype.options = routeEndpoint.args;
274						} else {
275
276							// We already have options, merge these new args in.
277							modelInstance.prototype.options = _.extend( modelInstance.prototype.options, routeEndpoint.args );
278						}
279					}
280
281				}
282			}
283
284		} );
285
286	};
287
288	/**
289	 * Add mixins and helpers to models depending on their defaults.
290	 *
291	 * @param {Backbone Model} model          The model to attach helpers and mixins to.
292	 * @param {string}         modelClassName The classname of the constructed model.
293	 * @param {Object} 	       loadingObjects An object containing the models and collections we are building.
294	 */
295	wp.api.utils.addMixinsAndHelpers = function( model, modelClassName, loadingObjects ) {
296
297		var hasDate = false,
298
299			/**
300			 * Array of parseable dates.
301			 *
302			 * @type {string[]}.
303			 */
304			parseableDates = [ 'date', 'modified', 'date_gmt', 'modified_gmt' ],
305
306			/**
307			 * Mixin for all content that is time stamped.
308			 *
309			 * This mixin converts between mysql timestamps and JavaScript Dates when syncing a model
310			 * to or from the server. For example, a date stored as `2015-12-27T21:22:24` on the server
311			 * gets expanded to `Sun Dec 27 2015 14:22:24 GMT-0700 (MST)` when the model is fetched.
312			 *
313			 * @type {{toJSON: toJSON, parse: parse}}.
314			 */
315			TimeStampedMixin = {
316
317				/**
318				 * Prepare a JavaScript Date for transmitting to the server.
319				 *
320				 * This helper function accepts a field and Date object. It converts the passed Date
321				 * to an ISO string and sets that on the model field.
322				 *
323				 * @param {Date}   date   A JavaScript date object. WordPress expects dates in UTC.
324				 * @param {string} field  The date field to set. One of 'date', 'date_gmt', 'date_modified'
325				 *                        or 'date_modified_gmt'. Optional, defaults to 'date'.
326				 */
327				setDate: function( date, field ) {
328					var theField = field || 'date';
329
330					// Don't alter non-parsable date fields.
331					if ( _.indexOf( parseableDates, theField ) < 0 ) {
332						return false;
333					}
334
335					this.set( theField, date.toISOString() );
336				},
337
338				/**
339				 * Get a JavaScript Date from the passed field.
340				 *
341				 * WordPress returns 'date' and 'date_modified' in the timezone of the server as well as
342				 * UTC dates as 'date_gmt' and 'date_modified_gmt'. Draft posts do not include UTC dates.
343				 *
344				 * @param {string} field  The date field to set. One of 'date', 'date_gmt', 'date_modified'
345				 *                        or 'date_modified_gmt'. Optional, defaults to 'date'.
346				 */
347				getDate: function( field ) {
348					var theField   = field || 'date',
349						theISODate = this.get( theField );
350
351					// Only get date fields and non-null values.
352					if ( _.indexOf( parseableDates, theField ) < 0 || _.isNull( theISODate ) ) {
353						return false;
354					}
355
356					return new Date( wp.api.utils.parseISO8601( theISODate ) );
357				}
358			},
359
360			/**
361			 * Build a helper function to retrieve related model.
362			 *
363			 * @param {string} parentModel      The parent model.
364			 * @param {number} modelId          The model ID if the object to request
365			 * @param {string} modelName        The model name to use when constructing the model.
366			 * @param {string} embedSourcePoint Where to check the embedded object for _embed data.
367			 * @param {string} embedCheckField  Which model field to check to see if the model has data.
368			 *
369			 * @return {Deferred.promise}        A promise which resolves to the constructed model.
370			 */
371			buildModelGetter = function( parentModel, modelId, modelName, embedSourcePoint, embedCheckField ) {
372				var getModel, embeddedObjects, attributes, deferred;
373
374				deferred        = jQuery.Deferred();
375				embeddedObjects = parentModel.get( '_embedded' ) || {};
376
377				// Verify that we have a valid object id.
378				if ( ! _.isNumber( modelId ) || 0 === modelId ) {
379					deferred.reject();
380					return deferred;
381				}
382
383				// If we have embedded object data, use that when constructing the getModel.
384				if ( embeddedObjects[ embedSourcePoint ] ) {
385					attributes = _.findWhere( embeddedObjects[ embedSourcePoint ], { id: modelId } );
386				}
387
388				// Otherwise use the modelId.
389				if ( ! attributes ) {
390					attributes = { id: modelId };
391				}
392
393				// Create the new getModel model.
394				getModel = new wp.api.models[ modelName ]( attributes );
395
396				if ( ! getModel.get( embedCheckField ) ) {
397					getModel.fetch( {
398						success: function( getModel ) {
399							deferred.resolve( getModel );
400						},
401						error: function( getModel, response ) {
402							deferred.reject( response );
403						}
404					} );
405				} else {
406					// Resolve with the embedded model.
407					deferred.resolve( getModel );
408				}
409
410				// Return a promise.
411				return deferred.promise();
412			},
413
414			/**
415			 * Build a helper to retrieve a collection.
416			 *
417			 * @param {string} parentModel      The parent model.
418			 * @param {string} collectionName   The name to use when constructing the collection.
419			 * @param {string} embedSourcePoint Where to check the embedded object for _embed data.
420			 * @param {string} embedIndex       An additional optional index for the _embed data.
421			 *
422			 * @return {Deferred.promise} A promise which resolves to the constructed collection.
423			 */
424			buildCollectionGetter = function( parentModel, collectionName, embedSourcePoint, embedIndex ) {
425				/**
426				 * Returns a promise that resolves to the requested collection
427				 *
428				 * Uses the embedded data if available, otherwise fetches the
429				 * data from the server.
430				 *
431				 * @return {Deferred.promise} promise Resolves to a wp.api.collections[ collectionName ]
432				 * collection.
433				 */
434				var postId, embeddedObjects, getObjects,
435					classProperties = '',
436					properties      = '',
437					deferred        = jQuery.Deferred();
438
439				postId          = parentModel.get( 'id' );
440				embeddedObjects = parentModel.get( '_embedded' ) || {};
441
442				// Verify that we have a valid post ID.
443				if ( ! _.isNumber( postId ) || 0 === postId ) {
444					deferred.reject();
445					return deferred;
446				}
447
448				// If we have embedded getObjects data, use that when constructing the getObjects.
449				if ( ! _.isUndefined( embedSourcePoint ) && ! _.isUndefined( embeddedObjects[ embedSourcePoint ] ) ) {
450
451					// Some embeds also include an index offset, check for that.
452					if ( _.isUndefined( embedIndex ) ) {
453
454						// Use the embed source point directly.
455						properties = embeddedObjects[ embedSourcePoint ];
456					} else {
457
458						// Add the index to the embed source point.
459						properties = embeddedObjects[ embedSourcePoint ][ embedIndex ];
460					}
461				} else {
462
463					// Otherwise use the postId.
464					classProperties = { parent: postId };
465				}
466
467				// Create the new getObjects collection.
468				getObjects = new wp.api.collections[ collectionName ]( properties, classProperties );
469
470				// If we didn’t have embedded getObjects, fetch the getObjects data.
471				if ( _.isUndefined( getObjects.models[0] ) ) {
472					getObjects.fetch( {
473						success: function( getObjects ) {
474
475							// Add a helper 'parent_post' attribute onto the model.
476							setHelperParentPost( getObjects, postId );
477							deferred.resolve( getObjects );
478						},
479						error: function( getModel, response ) {
480							deferred.reject( response );
481						}
482					} );
483				} else {
484
485					// Add a helper 'parent_post' attribute onto the model.
486					setHelperParentPost( getObjects, postId );
487					deferred.resolve( getObjects );
488				}
489
490				// Return a promise.
491				return deferred.promise();
492
493			},
494
495			/**
496			 * Set the model post parent.
497			 */
498			setHelperParentPost = function( collection, postId ) {
499
500				// Attach post_parent id to the collection.
501				_.each( collection.models, function( model ) {
502					model.set( 'parent_post', postId );
503				} );
504			},
505
506			/**
507			 * Add a helper function to handle post Meta.
508			 */
509			MetaMixin = {
510
511				/**
512				 * Get meta by key for a post.
513				 *
514				 * @param {string} key The meta key.
515				 *
516				 * @return {Object} The post meta value.
517				 */
518				getMeta: function( key ) {
519					var metas = this.get( 'meta' );
520					return metas[ key ];
521				},
522
523				/**
524				 * Get all meta key/values for a post.
525				 *
526				 * @return {Object} The post metas, as a key value pair object.
527				 */
528				getMetas: function() {
529					return this.get( 'meta' );
530				},
531
532				/**
533				 * Set a group of meta key/values for a post.
534				 *
535				 * @param {Object} meta The post meta to set, as key/value pairs.
536				 */
537				setMetas: function( meta ) {
538					var metas = this.get( 'meta' );
539					_.extend( metas, meta );
540					this.set( 'meta', metas );
541				},
542
543				/**
544				 * Set a single meta value for a post, by key.
545				 *
546				 * @param {string} key   The meta key.
547				 * @param {Object} value The meta value.
548				 */
549				setMeta: function( key, value ) {
550					var metas = this.get( 'meta' );
551					metas[ key ] = value;
552					this.set( 'meta', metas );
553				}
554			},
555
556			/**
557			 * Add a helper function to handle post Revisions.
558			 */
559			RevisionsMixin = {
560				getRevisions: function() {
561					return buildCollectionGetter( this, 'PostRevisions' );
562				}
563			},
564
565			/**
566			 * Add a helper function to handle post Tags.
567			 */
568			TagsMixin = {
569
570				/**
571				 * Get the tags for a post.
572				 *
573				 * @return {Deferred.promise} promise Resolves to an array of tags.
574				 */
575				getTags: function() {
576					var tagIds = this.get( 'tags' ),
577						tags  = new wp.api.collections.Tags();
578
579					// Resolve with an empty array if no tags.
580					if ( _.isEmpty( tagIds ) ) {
581						return jQuery.Deferred().resolve( [] );
582					}
583
584					return tags.fetch( { data: { include: tagIds } } );
585				},
586
587				/**
588				 * Set the tags for a post.
589				 *
590				 * Accepts an array of tag slugs, or a Tags collection.
591				 *
592				 * @param {Array|Backbone.Collection} tags The tags to set on the post.
593				 *
594				 */
595				setTags: function( tags ) {
596					var allTags, newTag,
597						self = this,
598						newTags = [];
599
600					if ( _.isString( tags ) ) {
601						return false;
602					}
603
604					// If this is an array of slugs, build a collection.
605					if ( _.isArray( tags ) ) {
606
607						// Get all the tags.
608						allTags = new wp.api.collections.Tags();
609						allTags.fetch( {
610							data:    { per_page: 100 },
611							success: function( alltags ) {
612
613								// Find the passed tags and set them up.
614								_.each( tags, function( tag ) {
615									newTag = new wp.api.models.Tag( alltags.findWhere( { slug: tag } ) );
616
617									// Tie the new tag to the post.
618									newTag.set( 'parent_post', self.get( 'id' ) );
619
620									// Add the new tag to the collection.
621									newTags.push( newTag );
622								} );
623								tags = new wp.api.collections.Tags( newTags );
624								self.setTagsWithCollection( tags );
625							}
626						} );
627
628					} else {
629						this.setTagsWithCollection( tags );
630					}
631				},
632
633				/**
634				 * Set the tags for a post.
635				 *
636				 * Accepts a Tags collection.
637				 *
638				 * @param {Array|Backbone.Collection} tags The tags to set on the post.
639				 *
640				 */
641				setTagsWithCollection: function( tags ) {
642
643					// Pluck out the category IDs.
644					this.set( 'tags', tags.pluck( 'id' ) );
645					return this.save();
646				}
647			},
648
649			/**
650			 * Add a helper function to handle post Categories.
651			 */
652			CategoriesMixin = {
653
654				/**
655				 * Get a the categories for a post.
656				 *
657				 * @return {Deferred.promise} promise Resolves to an array of categories.
658				 */
659				getCategories: function() {
660					var categoryIds = this.get( 'categories' ),
661						categories  = new wp.api.collections.Categories();
662
663					// Resolve with an empty array if no categories.
664					if ( _.isEmpty( categoryIds ) ) {
665						return jQuery.Deferred().resolve( [] );
666					}
667
668					return categories.fetch( { data: { include: categoryIds } } );
669				},
670
671				/**
672				 * Set the categories for a post.
673				 *
674				 * Accepts an array of category slugs, or a Categories collection.
675				 *
676				 * @param {Array|Backbone.Collection} categories The categories to set on the post.
677				 *
678				 */
679				setCategories: function( categories ) {
680					var allCategories, newCategory,
681						self = this,
682						newCategories = [];
683
684					if ( _.isString( categories ) ) {
685						return false;
686					}
687
688					// If this is an array of slugs, build a collection.
689					if ( _.isArray( categories ) ) {
690
691						// Get all the categories.
692						allCategories = new wp.api.collections.Categories();
693						allCategories.fetch( {
694							data:    { per_page: 100 },
695							success: function( allcats ) {
696
697								// Find the passed categories and set them up.
698								_.each( categories, function( category ) {
699									newCategory = new wp.api.models.Category( allcats.findWhere( { slug: category } ) );
700
701									// Tie the new category to the post.
702									newCategory.set( 'parent_post', self.get( 'id' ) );
703
704									// Add the new category to the collection.
705									newCategories.push( newCategory );
706								} );
707								categories = new wp.api.collections.Categories( newCategories );
708								self.setCategoriesWithCollection( categories );
709							}
710						} );
711
712					} else {
713						this.setCategoriesWithCollection( categories );
714					}
715
716				},
717
718				/**
719				 * Set the categories for a post.
720				 *
721				 * Accepts Categories collection.
722				 *
723				 * @param {Array|Backbone.Collection} categories The categories to set on the post.
724				 *
725				 */
726				setCategoriesWithCollection: function( categories ) {
727
728					// Pluck out the category IDs.
729					this.set( 'categories', categories.pluck( 'id' ) );
730					return this.save();
731				}
732			},
733
734			/**
735			 * Add a helper function to retrieve the author user model.
736			 */
737			AuthorMixin = {
738				getAuthorUser: function() {
739					return buildModelGetter( this, this.get( 'author' ), 'User', 'author', 'name' );
740				}
741			},
742
743			/**
744			 * Add a helper function to retrieve the featured media.
745			 */
746			FeaturedMediaMixin = {
747				getFeaturedMedia: function() {
748					return buildModelGetter( this, this.get( 'featured_media' ), 'Media', 'wp:featuredmedia', 'source_url' );
749				}
750			};
751
752		// Exit if we don't have valid model defaults.
753		if ( _.isUndefined( model.prototype.args ) ) {
754			return model;
755		}
756
757		// Go thru the parsable date fields, if our model contains any of them it gets the TimeStampedMixin.
758		_.each( parseableDates, function( theDateKey ) {
759			if ( ! _.isUndefined( model.prototype.args[ theDateKey ] ) ) {
760				hasDate = true;
761			}
762		} );
763
764		// Add the TimeStampedMixin for models that contain a date field.
765		if ( hasDate ) {
766			model = model.extend( TimeStampedMixin );
767		}
768
769		// Add the AuthorMixin for models that contain an author.
770		if ( ! _.isUndefined( model.prototype.args.author ) ) {
771			model = model.extend( AuthorMixin );
772		}
773
774		// Add the FeaturedMediaMixin for models that contain a featured_media.
775		if ( ! _.isUndefined( model.prototype.args.featured_media ) ) {
776			model = model.extend( FeaturedMediaMixin );
777		}
778
779		// Add the CategoriesMixin for models that support categories collections.
780		if ( ! _.isUndefined( model.prototype.args.categories ) ) {
781			model = model.extend( CategoriesMixin );
782		}
783
784		// Add the MetaMixin for models that support meta.
785		if ( ! _.isUndefined( model.prototype.args.meta ) ) {
786			model = model.extend( MetaMixin );
787		}
788
789		// Add the TagsMixin for models that support tags collections.
790		if ( ! _.isUndefined( model.prototype.args.tags ) ) {
791			model = model.extend( TagsMixin );
792		}
793
794		// Add the RevisionsMixin for models that support revisions collections.
795		if ( ! _.isUndefined( loadingObjects.collections[ modelClassName + 'Revisions' ] ) ) {
796			model = model.extend( RevisionsMixin );
797		}
798
799		return model;
800	};
801
802})( window );
803
804/* global wpApiSettings:false */
805
806// Suppress warning about parse function's unused "options" argument:
807/* jshint unused:false */
808(function() {
809
810	'use strict';
811
812	var wpApiSettings = window.wpApiSettings || {},
813	trashableTypes    = [ 'Comment', 'Media', 'Comment', 'Post', 'Page', 'Status', 'Taxonomy', 'Type' ];
814
815	/**
816	 * Backbone base model for all models.
817	 */
818	wp.api.WPApiBaseModel = Backbone.Model.extend(
819		/** @lends WPApiBaseModel.prototype  */
820		{
821
822			// Initialize the model.
823			initialize: function() {
824
825				/**
826				* Types that don't support trashing require passing ?force=true to delete.
827				*
828				*/
829				if ( -1 === _.indexOf( trashableTypes, this.name ) ) {
830					this.requireForceForDelete = true;
831				}
832			},
833
834			/**
835			 * Set nonce header before every Backbone sync.
836			 *
837			 * @param {string} method.
838			 * @param {Backbone.Model} model.
839			 * @param {{beforeSend}, *} options.
840			 * @return {*}.
841			 */
842			sync: function( method, model, options ) {
843				var beforeSend;
844
845				options = options || {};
846
847				// Remove date_gmt if null.
848				if ( _.isNull( model.get( 'date_gmt' ) ) ) {
849					model.unset( 'date_gmt' );
850				}
851
852				// Remove slug if empty.
853				if ( _.isEmpty( model.get( 'slug' ) ) ) {
854					model.unset( 'slug' );
855				}
856
857				if ( _.isFunction( model.nonce ) && ! _.isEmpty( model.nonce() ) ) {
858					beforeSend = options.beforeSend;
859
860					// @todo Enable option for jsonp endpoints.
861					// options.dataType = 'jsonp';
862
863					// Include the nonce with requests.
864					options.beforeSend = function( xhr ) {
865						xhr.setRequestHeader( 'X-WP-Nonce', model.nonce() );
866
867						if ( beforeSend ) {
868							return beforeSend.apply( this, arguments );
869						}
870					};
871
872					// Update the nonce when a new nonce is returned with the response.
873					options.complete = function( xhr ) {
874						var returnedNonce = xhr.getResponseHeader( 'X-WP-Nonce' );
875
876						if ( returnedNonce && _.isFunction( model.nonce ) && model.nonce() !== returnedNonce ) {
877							model.endpointModel.set( 'nonce', returnedNonce );
878						}
879					};
880				}
881
882				// Add '?force=true' to use delete method when required.
883				if ( this.requireForceForDelete && 'delete' === method ) {
884					model.url = model.url() + '?force=true';
885				}
886				return Backbone.sync( method, model, options );
887			},
888
889			/**
890			 * Save is only allowed when the PUT OR POST methods are available for the endpoint.
891			 */
892			save: function( attrs, options ) {
893
894				// Do we have the put method, then execute the save.
895				if ( _.includes( this.methods, 'PUT' ) || _.includes( this.methods, 'POST' ) ) {
896
897					// Proxy the call to the original save function.
898					return Backbone.Model.prototype.save.call( this, attrs, options );
899				} else {
900
901					// Otherwise bail, disallowing action.
902					return false;
903				}
904			},
905
906			/**
907			 * Delete is only allowed when the DELETE method is available for the endpoint.
908			 */
909			destroy: function( options ) {
910
911				// Do we have the DELETE method, then execute the destroy.
912				if ( _.includes( this.methods, 'DELETE' ) ) {
913
914					// Proxy the call to the original save function.
915					return Backbone.Model.prototype.destroy.call( this, options );
916				} else {
917
918					// Otherwise bail, disallowing action.
919					return false;
920				}
921			}
922
923		}
924	);
925
926	/**
927	 * API Schema model. Contains meta information about the API.
928	 */
929	wp.api.models.Schema = wp.api.WPApiBaseModel.extend(
930		/** @lends Schema.prototype  */
931		{
932			defaults: {
933				_links: {},
934				namespace: null,
935				routes: {}
936			},
937
938			initialize: function( attributes, options ) {
939				var model = this;
940				options = options || {};
941
942				wp.api.WPApiBaseModel.prototype.initialize.call( model, attributes, options );
943
944				model.apiRoot = options.apiRoot || wpApiSettings.root;
945				model.versionString = options.versionString || wpApiSettings.versionString;
946			},
947
948			url: function() {
949				return this.apiRoot + this.versionString;
950			}
951		}
952	);
953})();
954
955( function() {
956
957	'use strict';
958
959	var wpApiSettings = window.wpApiSettings || {};
960
961	/**
962	 * Contains basic collection functionality such as pagination.
963	 */
964	wp.api.WPApiBaseCollection = Backbone.Collection.extend(
965		/** @lends BaseCollection.prototype  */
966		{
967
968			/**
969			 * Setup default state.
970			 */
971			initialize: function( models, options ) {
972				this.state = {
973					data: {},
974					currentPage: null,
975					totalPages: null,
976					totalObjects: null
977				};
978				if ( _.isUndefined( options ) ) {
979					this.parent = '';
980				} else {
981					this.parent = options.parent;
982				}
983			},
984
985			/**
986			 * Extend Backbone.Collection.sync to add nince and pagination support.
987			 *
988			 * Set nonce header before every Backbone sync.
989			 *
990			 * @param {string} method.
991			 * @param {Backbone.Model} model.
992			 * @param {{success}, *} options.
993			 * @return {*}.
994			 */
995			sync: function( method, model, options ) {
996				var beforeSend, success,
997					self = this;
998
999				options = options || {};
1000
1001				if ( _.isFunction( model.nonce ) && ! _.isEmpty( model.nonce() ) ) {
1002					beforeSend = options.beforeSend;
1003
1004					// Include the nonce with requests.
1005					options.beforeSend = function( xhr ) {
1006						xhr.setRequestHeader( 'X-WP-Nonce', model.nonce() );
1007
1008						if ( beforeSend ) {
1009							return beforeSend.apply( self, arguments );
1010						}
1011					};
1012
1013					// Update the nonce when a new nonce is returned with the response.
1014					options.complete = function( xhr ) {
1015						var returnedNonce = xhr.getResponseHeader( 'X-WP-Nonce' );
1016
1017						if ( returnedNonce && _.isFunction( model.nonce ) && model.nonce() !== returnedNonce ) {
1018							model.endpointModel.set( 'nonce', returnedNonce );
1019						}
1020					};
1021				}
1022
1023				// When reading, add pagination data.
1024				if ( 'read' === method ) {
1025					if ( options.data ) {
1026						self.state.data = _.clone( options.data );
1027
1028						delete self.state.data.page;
1029					} else {
1030						self.state.data = options.data = {};
1031					}
1032
1033					if ( 'undefined' === typeof options.data.page ) {
1034						self.state.currentPage  = null;
1035						self.state.totalPages   = null;
1036						self.state.totalObjects = null;
1037					} else {
1038						self.state.currentPage = options.data.page - 1;
1039					}
1040
1041					success = options.success;
1042					options.success = function( data, textStatus, request ) {
1043						if ( ! _.isUndefined( request ) ) {
1044							self.state.totalPages   = parseInt( request.getResponseHeader( 'x-wp-totalpages' ), 10 );
1045							self.state.totalObjects = parseInt( request.getResponseHeader( 'x-wp-total' ), 10 );
1046						}
1047
1048						if ( null === self.state.currentPage ) {
1049							self.state.currentPage = 1;
1050						} else {
1051							self.state.currentPage++;
1052						}
1053
1054						if ( success ) {
1055							return success.apply( this, arguments );
1056						}
1057					};
1058				}
1059
1060				// Continue by calling Backbone's sync.
1061				return Backbone.sync( method, model, options );
1062			},
1063
1064			/**
1065			 * Fetches the next page of objects if a new page exists.
1066			 *
1067			 * @param {data: {page}} options.
1068			 * @return {*}.
1069			 */
1070			more: function( options ) {
1071				options = options || {};
1072				options.data = options.data || {};
1073
1074				_.extend( options.data, this.state.data );
1075
1076				if ( 'undefined' === typeof options.data.page ) {
1077					if ( ! this.hasMore() ) {
1078						return false;
1079					}
1080
1081					if ( null === this.state.currentPage || this.state.currentPage <= 1 ) {
1082						options.data.page = 2;
1083					} else {
1084						options.data.page = this.state.currentPage + 1;
1085					}
1086				}
1087
1088				return this.fetch( options );
1089			},
1090
1091			/**
1092			 * Returns true if there are more pages of objects available.
1093			 *
1094			 * @return {null|boolean}
1095			 */
1096			hasMore: function() {
1097				if ( null === this.state.totalPages ||
1098					 null === this.state.totalObjects ||
1099					 null === this.state.currentPage ) {
1100					return null;
1101				} else {
1102					return ( this.state.currentPage < this.state.totalPages );
1103				}
1104			}
1105		}
1106	);
1107
1108} )();
1109
1110( function() {
1111
1112	'use strict';
1113
1114	var Endpoint, initializedDeferreds = {},
1115		wpApiSettings = window.wpApiSettings || {};
1116
1117	/** @namespace wp */
1118	window.wp = window.wp || {};
1119
1120	/** @namespace wp.api */
1121	wp.api    = wp.api || {};
1122
1123	// If wpApiSettings is unavailable, try the default.
1124	if ( _.isEmpty( wpApiSettings ) ) {
1125		wpApiSettings.root = window.location.origin + '/wp-json/';
1126	}
1127
1128	Endpoint = Backbone.Model.extend(/** @lends Endpoint.prototype */{
1129		defaults: {
1130			apiRoot: wpApiSettings.root,
1131			versionString: wp.api.versionString,
1132			nonce: null,
1133			schema: null,
1134			models: {},
1135			collections: {}
1136		},
1137
1138		/**
1139		 * Initialize the Endpoint model.
1140		 */
1141		initialize: function() {
1142			var model = this, deferred;
1143
1144			Backbone.Model.prototype.initialize.apply( model, arguments );
1145
1146			deferred = jQuery.Deferred();
1147			model.schemaConstructed = deferred.promise();
1148
1149			model.schemaModel = new wp.api.models.Schema( null, {
1150				apiRoot:       model.get( 'apiRoot' ),
1151				versionString: model.get( 'versionString' ),
1152				nonce:         model.get( 'nonce' )
1153			} );
1154
1155			// When the model loads, resolve the promise.
1156			model.schemaModel.once( 'change', function() {
1157				model.constructFromSchema();
1158				deferred.resolve( model );
1159			} );
1160
1161			if ( model.get( 'schema' ) ) {
1162
1163				// Use schema supplied as model attribute.
1164				model.schemaModel.set( model.schemaModel.parse( model.get( 'schema' ) ) );
1165			} else if (
1166				! _.isUndefined( sessionStorage ) &&
1167				( _.isUndefined( wpApiSettings.cacheSchema ) || wpApiSettings.cacheSchema ) &&
1168				sessionStorage.getItem( 'wp-api-schema-model' + model.get( 'apiRoot' ) + model.get( 'versionString' ) )
1169			) {
1170
1171				// Used a cached copy of the schema model if available.
1172				model.schemaModel.set( model.schemaModel.parse( JSON.parse( sessionStorage.getItem( 'wp-api-schema-model' + model.get( 'apiRoot' ) + model.get( 'versionString' ) ) ) ) );
1173			} else {
1174				model.schemaModel.fetch( {
1175					/**
1176					 * When the server returns the schema model data, store the data in a sessionCache so we don't
1177					 * have to retrieve it again for this session. Then, construct the models and collections based
1178					 * on the schema model data.
1179					 *
1180					 * @ignore
1181					 */
1182					success: function( newSchemaModel ) {
1183
1184						// Store a copy of the schema model in the session cache if available.
1185						if ( ! _.isUndefined( sessionStorage ) && ( _.isUndefined( wpApiSettings.cacheSchema ) || wpApiSettings.cacheSchema ) ) {
1186							try {
1187								sessionStorage.setItem( 'wp-api-schema-model' + model.get( 'apiRoot' ) + model.get( 'versionString' ), JSON.stringify( newSchemaModel ) );
1188							} catch ( error ) {
1189
1190								// Fail silently, fixes errors in safari private mode.
1191							}
1192						}
1193					},
1194
1195					// Log the error condition.
1196					error: function( err ) {
1197						window.console.log( err );
1198					}
1199				} );
1200			}
1201		},
1202
1203		constructFromSchema: function() {
1204			var routeModel = this, modelRoutes, collectionRoutes, schemaRoot, loadingObjects,
1205
1206			/**
1207			 * Set up the model and collection name mapping options. As the schema is built, the
1208			 * model and collection names will be adjusted if they are found in the mapping object.
1209			 *
1210			 * Localizing a variable wpApiSettings.mapping will over-ride the default mapping options.
1211			 *
1212			 */
1213			mapping = wpApiSettings.mapping || {
1214				models: {
1215					'Categories':      'Category',
1216					'Comments':        'Comment',
1217					'Pages':           'Page',
1218					'PagesMeta':       'PageMeta',
1219					'PagesRevisions':  'PageRevision',
1220					'Posts':           'Post',
1221					'PostsCategories': 'PostCategory',
1222					'PostsRevisions':  'PostRevision',
1223					'PostsTags':       'PostTag',
1224					'Schema':          'Schema',
1225					'Statuses':        'Status',
1226					'Tags':            'Tag',
1227					'Taxonomies':      'Taxonomy',
1228					'Types':           'Type',
1229					'Users':           'User'
1230				},
1231				collections: {
1232					'PagesMeta':       'PageMeta',
1233					'PagesRevisions':  'PageRevisions',
1234					'PostsCategories': 'PostCategories',
1235					'PostsMeta':       'PostMeta',
1236					'PostsRevisions':  'PostRevisions',
1237					'PostsTags':       'PostTags'
1238				}
1239			},
1240
1241			modelEndpoints = routeModel.get( 'modelEndpoints' ),
1242			modelRegex     = new RegExp( '(?:.*[+)]|\/(' + modelEndpoints.join( '|' ) + '))$' );
1243
1244			/**
1245			 * Iterate thru the routes, picking up models and collections to build. Builds two arrays,
1246			 * one for models and one for collections.
1247			 */
1248			modelRoutes      = [];
1249			collectionRoutes = [];
1250			schemaRoot       = routeModel.get( 'apiRoot' ).replace( wp.api.utils.getRootUrl(), '' );
1251			loadingObjects   = {};
1252
1253			/**
1254			 * Tracking objects for models and collections.
1255			 */
1256			loadingObjects.models      = {};
1257			loadingObjects.collections = {};
1258
1259			_.each( routeModel.schemaModel.get( 'routes' ), function( route, index ) {
1260
1261				// Skip the schema root if included in the schema.
1262				if ( index !== routeModel.get( ' versionString' ) &&
1263						index !== schemaRoot &&
1264						index !== ( '/' + routeModel.get( 'versionString' ).slice( 0, -1 ) )
1265				) {
1266
1267					// Single items end with a regex, or a special case word.
1268					if ( modelRegex.test( index ) ) {
1269						modelRoutes.push( { index: index, route: route } );
1270					} else {
1271
1272						// Collections end in a name.
1273						collectionRoutes.push( { index: index, route: route } );
1274					}
1275				}
1276			} );
1277
1278			/**
1279			 * Construct the models.
1280			 *
1281			 * Base the class name on the route endpoint.
1282			 */
1283			_.each( modelRoutes, function( modelRoute ) {
1284
1285				// Extract the name and any parent from the route.
1286				var modelClassName,
1287					routeName  = wp.api.utils.extractRoutePart( modelRoute.index, 2, routeModel.get( 'versionString' ), true ),
1288					parentName = wp.api.utils.extractRoutePart( modelRoute.index, 1, routeModel.get( 'versionString' ), false ),
1289					routeEnd   = wp.api.utils.extractRoutePart( modelRoute.index, 1, routeModel.get( 'versionString' ), true );
1290
1291				// Clear the parent part of the rouite if its actually the version string.
1292				if ( parentName === routeModel.get( 'versionString' ) ) {
1293					parentName = '';
1294				}
1295
1296				// Handle the special case of the 'me' route.
1297				if ( 'me' === routeEnd ) {
1298					routeName = 'me';
1299				}
1300
1301				// If the model has a parent in its route, add that to its class name.
1302				if ( '' !== parentName && parentName !== routeName ) {
1303					modelClassName = wp.api.utils.capitalizeAndCamelCaseDashes( parentName ) + wp.api.utils.capitalizeAndCamelCaseDashes( routeName );
1304					modelClassName = mapping.models[ modelClassName ] || modelClassName;
1305					loadingObjects.models[ modelClassName ] = wp.api.WPApiBaseModel.extend( {
1306
1307						// Return a constructed url based on the parent and id.
1308						url: function() {
1309							var url =
1310								routeModel.get( 'apiRoot' ) +
1311								routeModel.get( 'versionString' ) +
1312								parentName +  '/' +
1313									( ( _.isUndefined( this.get( 'parent' ) ) || 0 === this.get( 'parent' ) ) ?
1314										( _.isUndefined( this.get( 'parent_post' ) ) ? '' : this.get( 'parent_post' ) + '/' ) :
1315										this.get( 'parent' ) + '/' ) +
1316								routeName;
1317
1318							if ( ! _.isUndefined( this.get( 'id' ) ) ) {
1319								url +=  '/' + this.get( 'id' );
1320							}
1321							return url;
1322						},
1323
1324						// Track nonces on the Endpoint 'routeModel'.
1325						nonce: function() {
1326							return routeModel.get( 'nonce' );
1327						},
1328
1329						endpointModel: routeModel,
1330
1331						// Include a reference to the original route object.
1332						route: modelRoute,
1333
1334						// Include a reference to the original class name.
1335						name: modelClassName,
1336
1337						// Include the array of route methods for easy reference.
1338						methods: modelRoute.route.methods,
1339
1340						// Include the array of route endpoints for easy reference.
1341						endpoints: modelRoute.route.endpoints
1342					} );
1343				} else {
1344
1345					// This is a model without a parent in its route.
1346					modelClassName = wp.api.utils.capitalizeAndCamelCaseDashes( routeName );
1347					modelClassName = mapping.models[ modelClassName ] || modelClassName;
1348					loadingObjects.models[ modelClassName ] = wp.api.WPApiBaseModel.extend( {
1349
1350						// Function that returns a constructed url based on the ID.
1351						url: function() {
1352							var url = routeModel.get( 'apiRoot' ) +
1353								routeModel.get( 'versionString' ) +
1354								( ( 'me' === routeName ) ? 'users/me' : routeName );
1355
1356							if ( ! _.isUndefined( this.get( 'id' ) ) ) {
1357								url +=  '/' + this.get( 'id' );
1358							}
1359							return url;
1360						},
1361
1362						// Track nonces at the Endpoint level.
1363						nonce: function() {
1364							return routeModel.get( 'nonce' );
1365						},
1366
1367						endpointModel: routeModel,
1368
1369						// Include a reference to the original route object.
1370						route: modelRoute,
1371
1372						// Include a reference to the original class name.
1373						name: modelClassName,
1374
1375						// Include the array of route methods for easy reference.
1376						methods: modelRoute.route.methods,
1377
1378						// Include the array of route endpoints for easy reference.
1379						endpoints: modelRoute.route.endpoints
1380					} );
1381				}
1382
1383				// Add defaults to the new model, pulled form the endpoint.
1384				wp.api.utils.decorateFromRoute(
1385					modelRoute.route.endpoints,
1386					loadingObjects.models[ modelClassName ],
1387					routeModel.get( 'versionString' )
1388				);
1389
1390			} );
1391
1392			/**
1393			 * Construct the collections.
1394			 *
1395			 * Base the class name on the route endpoint.
1396			 */
1397			_.each( collectionRoutes, function( collectionRoute ) {
1398
1399				// Extract the name and any parent from the route.
1400				var collectionClassName, modelClassName,
1401						routeName  = collectionRoute.index.slice( collectionRoute.index.lastIndexOf( '/' ) + 1 ),
1402						parentName = wp.api.utils.extractRoutePart( collectionRoute.index, 1, routeModel.get( 'versionString' ), false );
1403
1404				// If the collection has a parent in its route, add that to its class name.
1405				if ( '' !== parentName && parentName !== routeName && routeModel.get( 'versionString' ) !== parentName ) {
1406
1407					collectionClassName = wp.api.utils.capitalizeAndCamelCaseDashes( parentName ) + wp.api.utils.capitalizeAndCamelCaseDashes( routeName );
1408					modelClassName      = mapping.models[ collectionClassName ] || collectionClassName;
1409					collectionClassName = mapping.collections[ collectionClassName ] || collectionClassName;
1410					loadingObjects.collections[ collectionClassName ] = wp.api.WPApiBaseCollection.extend( {
1411
1412						// Function that returns a constructed url passed on the parent.
1413						url: function() {
1414							return routeModel.get( 'apiRoot' ) + routeModel.get( 'versionString' ) +
1415								parentName + '/' +
1416								( ( _.isUndefined( this.parent ) || '' === this.parent ) ?
1417									( _.isUndefined( this.get( 'parent_post' ) ) ? '' : this.get( 'parent_post' ) + '/' ) :
1418									this.parent + '/' ) +
1419								routeName;
1420						},
1421
1422						// Specify the model that this collection contains.
1423						model: function( attrs, options ) {
1424							return new loadingObjects.models[ modelClassName ]( attrs, options );
1425						},
1426
1427						// Track nonces at the Endpoint level.
1428						nonce: function() {
1429							return routeModel.get( 'nonce' );
1430						},
1431
1432						endpointModel: routeModel,
1433
1434						// Include a reference to the original class name.
1435						name: collectionClassName,
1436
1437						// Include a reference to the original route object.
1438						route: collectionRoute,
1439
1440						// Include the array of route methods for easy reference.
1441						methods: collectionRoute.route.methods
1442					} );
1443				} else {
1444
1445					// This is a collection without a parent in its route.
1446					collectionClassName = wp.api.utils.capitalizeAndCamelCaseDashes( routeName );
1447					modelClassName      = mapping.models[ collectionClassName ] || collectionClassName;
1448					collectionClassName = mapping.collections[ collectionClassName ] || collectionClassName;
1449					loadingObjects.collections[ collectionClassName ] = wp.api.WPApiBaseCollection.extend( {
1450
1451						// For the url of a root level collection, use a string.
1452						url: function() {
1453							return routeModel.get( 'apiRoot' ) + routeModel.get( 'versionString' ) + routeName;
1454						},
1455
1456						// Specify the model that this collection contains.
1457						model: function( attrs, options ) {
1458							return new loadingObjects.models[ modelClassName ]( attrs, options );
1459						},
1460
1461						// Track nonces at the Endpoint level.
1462						nonce: function() {
1463							return routeModel.get( 'nonce' );
1464						},
1465
1466						endpointModel: routeModel,
1467
1468						// Include a reference to the original class name.
1469						name: collectionClassName,
1470
1471						// Include a reference to the original route object.
1472						route: collectionRoute,
1473
1474						// Include the array of route methods for easy reference.
1475						methods: collectionRoute.route.methods
1476					} );
1477				}
1478
1479				// Add defaults to the new model, pulled form the endpoint.
1480				wp.api.utils.decorateFromRoute( collectionRoute.route.endpoints, loadingObjects.collections[ collectionClassName ] );
1481			} );
1482
1483			// Add mixins and helpers for each of the models.
1484			_.each( loadingObjects.models, function( model, index ) {
1485				loadingObjects.models[ index ] = wp.api.utils.addMixinsAndHelpers( model, index, loadingObjects );
1486			} );
1487
1488			// Set the routeModel models and collections.
1489			routeModel.set( 'models', loadingObjects.models );
1490			routeModel.set( 'collections', loadingObjects.collections );
1491
1492		}
1493
1494	} );
1495
1496	wp.api.endpoints = new Backbone.Collection();
1497
1498	/**
1499	 * Initialize the wp-api, optionally passing the API root.
1500	 *
1501	 * @param {Object} [args]
1502	 * @param {string} [args.nonce] The nonce. Optional, defaults to wpApiSettings.nonce.
1503	 * @param {string} [args.apiRoot] The api root. Optional, defaults to wpApiSettings.root.
1504	 * @param {string} [args.versionString] The version string. Optional, defaults to wpApiSettings.root.
1505	 * @param {Object} [args.schema] The schema. Optional, will be fetched from API if not provided.
1506	 */
1507	wp.api.init = function( args ) {
1508		var endpoint, attributes = {}, deferred, promise;
1509
1510		args                      = args || {};
1511		attributes.nonce          = _.isString( args.nonce ) ? args.nonce : ( wpApiSettings.nonce || '' );
1512		attributes.apiRoot        = args.apiRoot || wpApiSettings.root || '/wp-json';
1513		attributes.versionString  = args.versionString || wpApiSettings.versionString || 'wp/v2/';
1514		attributes.schema         = args.schema || null;
1515		attributes.modelEndpoints = args.modelEndpoints || [ 'me', 'settings' ];
1516		if ( ! attributes.schema && attributes.apiRoot === wpApiSettings.root && attributes.versionString === wpApiSettings.versionString ) {
1517			attributes.schema = wpApiSettings.schema;
1518		}
1519
1520		if ( ! initializedDeferreds[ attributes.apiRoot + attributes.versionString ] ) {
1521
1522			// Look for an existing copy of this endpoint.
1523			endpoint = wp.api.endpoints.findWhere( { 'apiRoot': attributes.apiRoot, 'versionString': attributes.versionString } );
1524			if ( ! endpoint ) {
1525				endpoint = new Endpoint( attributes );
1526			}
1527			deferred = jQuery.Deferred();
1528			promise = deferred.promise();
1529
1530			endpoint.schemaConstructed.done( function( resolvedEndpoint ) {
1531				wp.api.endpoints.add( resolvedEndpoint );
1532
1533				// Map the default endpoints, extending any already present items (including Schema model).
1534				wp.api.models      = _.extend( wp.api.models, resolvedEndpoint.get( 'models' ) );
1535				wp.api.collections = _.extend( wp.api.collections, resolvedEndpoint.get( 'collections' ) );
1536				deferred.resolve( resolvedEndpoint );
1537			} );
1538			initializedDeferreds[ attributes.apiRoot + attributes.versionString ] = promise;
1539		}
1540		return initializedDeferreds[ attributes.apiRoot + attributes.versionString ];
1541	};
1542
1543	/**
1544	 * Construct the default endpoints and add to an endpoints collection.
1545	 */
1546
1547	// The wp.api.init function returns a promise that will resolve with the endpoint once it is ready.
1548	wp.api.loadPromise = wp.api.init();
1549
1550} )();
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