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✏️ Editing: wp-api.js

/**
 * @output wp-includes/js/wp-api.js
 */

(function( window, undefined ) {

'use strict';

/**
	 * Initialize the WP_API.
	 */
	function WP_API() {
		/** @namespace wp.api.models */
		this.models = {};
		/** @namespace wp.api.collections */
		this.collections = {};
		/** @namespace wp.api.views */
		this.views = {};
	}

/** @namespace wp */
	window.wp            = window.wp || {};
	/** @namespace wp.api */
	wp.api               = wp.api || new WP_API();
	wp.api.versionString = wp.api.versionString || 'wp/v2/';

// Alias _includes to _.contains, ensuring it is available if lodash is used.
	if ( ! _.isFunction( _.includes ) && _.isFunction( _.contains ) ) {
	  _.includes = _.contains;
	}

})( window );

(function( window, undefined ) {

'use strict';

var pad, r;

/** @namespace wp */
	window.wp = window.wp || {};
	/** @namespace wp.api */
	wp.api = wp.api || {};
	/** @namespace wp.api.utils */
	wp.api.utils = wp.api.utils || {};

/**
	 * Determine model based on API route.
	 *
	 * @param {string} route    The API route.
	 *
	 * @return {Backbone Model} The model found at given route. Undefined if not found.
	 */
	wp.api.getModelByRoute = function( route ) {
		return _.find( wp.api.models, function( model ) {
			return model.prototype.route && route === model.prototype.route.index;
		} );
	};

/**
	 * Determine collection based on API route.
	 *
	 * @param {string} route    The API route.
	 *
	 * @return {Backbone Model} The collection found at given route. Undefined if not found.
	 */
	wp.api.getCollectionByRoute = function( route ) {
		return _.find( wp.api.collections, function( collection ) {
			return collection.prototype.route && route === collection.prototype.route.index;
		} );
	};

/**
	 * ECMAScript 5 shim, adapted from MDN.
	 * @link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toISOString
	 */
	if ( ! Date.prototype.toISOString ) {
		pad = function( number ) {
			r = String( number );
			if ( 1 === r.length ) {
				r = '0' + r;
			}

return r;
		};

Date.prototype.toISOString = function() {
			return this.getUTCFullYear() +
				'-' + pad( this.getUTCMonth() + 1 ) +
				'-' + pad( this.getUTCDate() ) +
				'T' + pad( this.getUTCHours() ) +
				':' + pad( this.getUTCMinutes() ) +
				':' + pad( this.getUTCSeconds() ) +
				'.' + String( ( this.getUTCMilliseconds() / 1000 ).toFixed( 3 ) ).slice( 2, 5 ) +
				'Z';
		};
	}

/**
	 * Parse date into ISO8601 format.
	 *
	 * @param {Date} date.
	 */
	wp.api.utils.parseISO8601 = function( date ) {
		var timestamp, struct, i, k,
			minutesOffset = 0,
			numericKeys = [ 1, 4, 5, 6, 7, 10, 11 ];

/*
		 * ES5 §15.9.4.2 states that the string should attempt to be parsed as a Date Time String Format string
		 * before falling back to any implementation-specific date parsing, so that’s what we do, even if native
		 * implementations could be faster.
		 */
		//              1 YYYY                2 MM       3 DD           4 HH    5 mm       6 ss        7 msec        8 Z 9 ±    10 tzHH    11 tzmm
		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 ) ) ) {

// Avoid NaN timestamps caused by “undefined” values being passed to Date.UTC.
			for ( i = 0; ( k = numericKeys[i] ); ++i ) {
				struct[k] = +struct[k] || 0;
			}

// Allow undefined days and months.
			struct[2] = ( +struct[2] || 1 ) - 1;
			struct[3] = +struct[3] || 1;

if ( 'Z' !== struct[8]  && undefined !== struct[9] ) {
				minutesOffset = struct[10] * 60 + struct[11];

if ( '+' === struct[9] ) {
					minutesOffset = 0 - minutesOffset;
				}
			}

timestamp = Date.UTC( struct[1], struct[2], struct[3], struct[4], struct[5] + minutesOffset, struct[6], struct[7] );
		} else {
			timestamp = Date.parse ? Date.parse( date ) : NaN;
		}

return timestamp;
	};

/**
	 * Helper function for getting the root URL.
	 * @return {[type]} [description]
	 */
	wp.api.utils.getRootUrl = function() {
		return window.location.origin ?
			window.location.origin + '/' :
			window.location.protocol + '//' + window.location.host + '/';
	};

/**
	 * Helper for capitalizing strings.
	 */
	wp.api.utils.capitalize = function( str ) {
		if ( _.isUndefined( str ) ) {
			return str;
		}
		return str.charAt( 0 ).toUpperCase() + str.slice( 1 );
	};

/**
	 * Helper function that capitalizes the first word and camel cases any words starting
	 * after dashes, removing the dashes.
	 */
	wp.api.utils.capitalizeAndCamelCaseDashes = function( str ) {
		if ( _.isUndefined( str ) ) {
			return str;
		}
		str = wp.api.utils.capitalize( str );

return wp.api.utils.camelCaseDashes( str );
	};

/**
	 * Helper function to camel case the letter after dashes, removing the dashes.
	 */
	wp.api.utils.camelCaseDashes = function( str ) {
		return str.replace( /-([a-z])/g, function( g ) {
			return g[ 1 ].toUpperCase();
		} );
	};

/**
	 * Extract a route part based on negative index.
	 *
	 * @param {string}   route          The endpoint route.
	 * @param {number}   part           The number of parts from the end of the route to retrieve. Default 1.
	 *                                  Example route `/a/b/c`: part 1 is `c`, part 2 is `b`, part 3 is `a`.
	 * @param {string}  [versionString] Version string, defaults to `wp.api.versionString`.
	 * @param {boolean} [reverse]       Whether to reverse the order when extracting the route part. Optional, default false.
	 */
	wp.api.utils.extractRoutePart = function( route, part, versionString, reverse ) {
		var routeParts;

part = part || 1;
		versionString = versionString || wp.api.versionString;

// Remove versions string from route to avoid returning it.
		if ( 0 === route.indexOf( '/' + versionString ) ) {
			route = route.substr( versionString.length + 1 );
		}

routeParts = route.split( '/' );
		if ( reverse ) {
			routeParts = routeParts.reverse();
		}
		if ( _.isUndefined( routeParts[ --part ] ) ) {
			return '';
		}
		return routeParts[ part ];
	};

/**
	 * Extract a parent name from a passed route.
	 *
	 * @param {string} route The route to extract a name from.
	 */
	wp.api.utils.extractParentName = function( route ) {
		var name,
			lastSlash = route.lastIndexOf( '_id>[\\d]+)/' );

if ( lastSlash < 0 ) {
			return '';
		}
		name = route.substr( 0, lastSlash - 1 );
		name = name.split( '/' );
		name.pop();
		name = name.pop();
		return name;
	};

/**
	 * Add args and options to a model prototype from a route's endpoints.
	 *
	 * @param {Array}  routeEndpoints Array of route endpoints.
	 * @param {Object} modelInstance  An instance of the model (or collection)
	 *                                to add the args to.
	 */
	wp.api.utils.decorateFromRoute = function( routeEndpoints, modelInstance ) {

/**
		 * Build the args based on route endpoint data.
		 */
		_.each( routeEndpoints, function( routeEndpoint ) {

// Add post and edit endpoints as model args.
			if ( _.includes( routeEndpoint.methods, 'POST' ) || _.includes( routeEndpoint.methods, 'PUT' ) ) {

// Add any non-empty args, merging them into the args object.
				if ( ! _.isEmpty( routeEndpoint.args ) ) {

// Set as default if no args yet.
					if ( _.isEmpty( modelInstance.prototype.args ) ) {
						modelInstance.prototype.args = routeEndpoint.args;
					} else {

// We already have args, merge these new args in.
						modelInstance.prototype.args = _.extend( modelInstance.prototype.args, routeEndpoint.args );
					}
				}
			} else {

// Add GET method as model options.
				if ( _.includes( routeEndpoint.methods, 'GET' ) ) {

// Add any non-empty args, merging them into the defaults object.
					if ( ! _.isEmpty( routeEndpoint.args ) ) {

// Set as default if no defaults yet.
						if ( _.isEmpty( modelInstance.prototype.options ) ) {
							modelInstance.prototype.options = routeEndpoint.args;
						} else {

// We already have options, merge these new args in.
							modelInstance.prototype.options = _.extend( modelInstance.prototype.options, routeEndpoint.args );
						}
					}

}
			}

} );

};

/**
	 * Add mixins and helpers to models depending on their defaults.
	 *
	 * @param {Backbone Model} model          The model to attach helpers and mixins to.
	 * @param {string}         modelClassName The classname of the constructed model.
	 * @param {Object} 	       loadingObjects An object containing the models and collections we are building.
	 */
	wp.api.utils.addMixinsAndHelpers = function( model, modelClassName, loadingObjects ) {

var hasDate = false,

/**
			 * Array of parseable dates.
			 *
			 * @type {string[]}.
			 */
			parseableDates = [ 'date', 'modified', 'date_gmt', 'modified_gmt' ],

/**
			 * Mixin for all content that is time stamped.
			 *
			 * This mixin converts between mysql timestamps and JavaScript Dates when syncing a model
			 * to or from the server. For example, a date stored as `2015-12-27T21:22:24` on the server
			 * gets expanded to `Sun Dec 27 2015 14:22:24 GMT-0700 (MST)` when the model is fetched.
			 *
			 * @type {{toJSON: toJSON, parse: parse}}.
			 */
			TimeStampedMixin = {

/**
				 * Prepare a JavaScript Date for transmitting to the server.
				 *
				 * This helper function accepts a field and Date object. It converts the passed Date
				 * to an ISO string and sets that on the model field.
				 *
				 * @param {Date}   date   A JavaScript date object. WordPress expects dates in UTC.
				 * @param {string} field  The date field to set. One of 'date', 'date_gmt', 'date_modified'
				 *                        or 'date_modified_gmt'. Optional, defaults to 'date'.
				 */
				setDate: function( date, field ) {
					var theField = field || 'date';

// Don't alter non-parsable date fields.
					if ( _.indexOf( parseableDates, theField ) < 0 ) {
						return false;
					}

this.set( theField, date.toISOString() );
				},

/**
				 * Get a JavaScript Date from the passed field.
				 *
				 * WordPress returns 'date' and 'date_modified' in the timezone of the server as well as
				 * UTC dates as 'date_gmt' and 'date_modified_gmt'. Draft posts do not include UTC dates.
				 *
				 * @param {string} field  The date field to set. One of 'date', 'date_gmt', 'date_modified'
				 *                        or 'date_modified_gmt'. Optional, defaults to 'date'.
				 */
				getDate: function( field ) {
					var theField   = field || 'date',
						theISODate = this.get( theField );

// Only get date fields and non-null values.
					if ( _.indexOf( parseableDates, theField ) < 0 || _.isNull( theISODate ) ) {
						return false;
					}

return new Date( wp.api.utils.parseISO8601( theISODate ) );
				}
			},

/**
			 * Build a helper function to retrieve related model.
			 *
			 * @param {string} parentModel      The parent model.
			 * @param {number} modelId          The model ID if the object to request
			 * @param {string} modelName        The model name to use when constructing the model.
			 * @param {string} embedSourcePoint Where to check the embedded object for _embed data.
			 * @param {string} embedCheckField  Which model field to check to see if the model has data.
			 *
			 * @return {Deferred.promise}        A promise which resolves to the constructed model.
			 */
			buildModelGetter = function( parentModel, modelId, modelName, embedSourcePoint, embedCheckField ) {
				var getModel, embeddedObjects, attributes, deferred;

deferred        = jQuery.Deferred();
				embeddedObjects = parentModel.get( '_embedded' ) || {};

// Verify that we have a valid object id.
				if ( ! _.isNumber( modelId ) || 0 === modelId ) {
					deferred.reject();
					return deferred;
				}

// If we have embedded object data, use that when constructing the getModel.
				if ( embeddedObjects[ embedSourcePoint ] ) {
					attributes = _.findWhere( embeddedObjects[ embedSourcePoint ], { id: modelId } );
				}

// Otherwise use the modelId.
				if ( ! attributes ) {
					attributes = { id: modelId };
				}

// Create the new getModel model.
				getModel = new wp.api.models[ modelName ]( attributes );

if ( ! getModel.get( embedCheckField ) ) {
					getModel.fetch( {
						success: function( getModel ) {
							deferred.resolve( getModel );
						},
						error: function( getModel, response ) {
							deferred.reject( response );
						}
					} );
				} else {
					// Resolve with the embedded model.
					deferred.resolve( getModel );
				}

// Return a promise.
				return deferred.promise();
			},

/**
			 * Build a helper to retrieve a collection.
			 *
			 * @param {string} parentModel      The parent model.
			 * @param {string} collectionName   The name to use when constructing the collection.
			 * @param {string} embedSourcePoint Where to check the embedded object for _embed data.
			 * @param {string} embedIndex       An additional optional index for the _embed data.
			 *
			 * @return {Deferred.promise} A promise which resolves to the constructed collection.
			 */
			buildCollectionGetter = function( parentModel, collectionName, embedSourcePoint, embedIndex ) {
				/**
				 * Returns a promise that resolves to the requested collection
				 *
				 * Uses the embedded data if available, otherwise fetches the
				 * data from the server.
				 *
				 * @return {Deferred.promise} promise Resolves to a wp.api.collections[ collectionName ]
				 * collection.
				 */
				var postId, embeddedObjects, getObjects,
					classProperties = '',
					properties      = '',
					deferred        = jQuery.Deferred();

postId          = parentModel.get( 'id' );
				embeddedObjects = parentModel.get( '_embedded' ) || {};

// Verify that we have a valid post ID.
				if ( ! _.isNumber( postId ) || 0 === postId ) {
					deferred.reject();
					return deferred;
				}

// If we have embedded getObjects data, use that when constructing the getObjects.
				if ( ! _.isUndefined( embedSourcePoint ) && ! _.isUndefined( embeddedObjects[ embedSourcePoint ] ) ) {

// Some embeds also include an index offset, check for that.
					if ( _.isUndefined( embedIndex ) ) {

// Use the embed source point directly.
						properties = embeddedObjects[ embedSourcePoint ];
					} else {

// Add the index to the embed source point.
						properties = embeddedObjects[ embedSourcePoint ][ embedIndex ];
					}
				} else {

// Otherwise use the postId.
					classProperties = { parent: postId };
				}

// Create the new getObjects collection.
				getObjects = new wp.api.collections[ collectionName ]( properties, classProperties );

// If we didn’t have embedded getObjects, fetch the getObjects data.
				if ( _.isUndefined( getObjects.models[0] ) ) {
					getObjects.fetch( {
						success: function( getObjects ) {

// Add a helper 'parent_post' attribute onto the model.
							setHelperParentPost( getObjects, postId );
							deferred.resolve( getObjects );
						},
						error: function( getModel, response ) {
							deferred.reject( response );
						}
					} );
				} else {

// Add a helper 'parent_post' attribute onto the model.
					setHelperParentPost( getObjects, postId );
					deferred.resolve( getObjects );
				}

// Return a promise.
				return deferred.promise();

/**
			 * Set the model post parent.
			 */
			setHelperParentPost = function( collection, postId ) {

// Attach post_parent id to the collection.
				_.each( collection.models, function( model ) {
					model.set( 'parent_post', postId );
				} );
			},

/**
			 * Add a helper function to handle post Meta.
			 */
			MetaMixin = {

/**
				 * Get meta by key for a post.
				 *
				 * @param {string} key The meta key.
				 *
				 * @return {Object} The post meta value.
				 */
				getMeta: function( key ) {
					var metas = this.get( 'meta' );
					return metas[ key ];
				},

/**
				 * Get all meta key/values for a post.
				 *
				 * @return {Object} The post metas, as a key value pair object.
				 */
				getMetas: function() {
					return this.get( 'meta' );
				},

/**
				 * Set a group of meta key/values for a post.
				 *
				 * @param {Object} meta The post meta to set, as key/value pairs.
				 */
				setMetas: function( meta ) {
					var metas = this.get( 'meta' );
					_.extend( metas, meta );
					this.set( 'meta', metas );
				},

/**
				 * Set a single meta value for a post, by key.
				 *
				 * @param {string} key   The meta key.
				 * @param {Object} value The meta value.
				 */
				setMeta: function( key, value ) {
					var metas = this.get( 'meta' );
					metas[ key ] = value;
					this.set( 'meta', metas );
				}
			},

/**
			 * Add a helper function to handle post Revisions.
			 */
			RevisionsMixin = {
				getRevisions: function() {
					return buildCollectionGetter( this, 'PostRevisions' );
				}
			},

/**
			 * Add a helper function to handle post Tags.
			 */
			TagsMixin = {

/**
				 * Get the tags for a post.
				 *
				 * @return {Deferred.promise} promise Resolves to an array of tags.
				 */
				getTags: function() {
					var tagIds = this.get( 'tags' ),
						tags  = new wp.api.collections.Tags();

// Resolve with an empty array if no tags.
					if ( _.isEmpty( tagIds ) ) {
						return jQuery.Deferred().resolve( [] );
					}

return tags.fetch( { data: { include: tagIds } } );
				},

/**
				 * Set the tags for a post.
				 *
				 * Accepts an array of tag slugs, or a Tags collection.
				 *
				 * @param {Array|Backbone.Collection} tags The tags to set on the post.
				 *
				 */
				setTags: function( tags ) {
					var allTags, newTag,
						self = this,
						newTags = [];

if ( _.isString( tags ) ) {
						return false;
					}

// If this is an array of slugs, build a collection.
					if ( _.isArray( tags ) ) {

// Get all the tags.
						allTags = new wp.api.collections.Tags();
						allTags.fetch( {
							data:    { per_page: 100 },
							success: function( alltags ) {

// Find the passed tags and set them up.
								_.each( tags, function( tag ) {
									newTag = new wp.api.models.Tag( alltags.findWhere( { slug: tag } ) );

// Tie the new tag to the post.
									newTag.set( 'parent_post', self.get( 'id' ) );

// Add the new tag to the collection.
									newTags.push( newTag );
								} );
								tags = new wp.api.collections.Tags( newTags );
								self.setTagsWithCollection( tags );
							}
						} );

} else {
						this.setTagsWithCollection( tags );
					}
				},

/**
				 * Set the tags for a post.
				 *
				 * Accepts a Tags collection.
				 *
				 * @param {Array|Backbone.Collection} tags The tags to set on the post.
				 *
				 */
				setTagsWithCollection: function( tags ) {

// Pluck out the category IDs.
					this.set( 'tags', tags.pluck( 'id' ) );
					return this.save();
				}
			},

/**
			 * Add a helper function to handle post Categories.
			 */
			CategoriesMixin = {

/**
				 * Get a the categories for a post.
				 *
				 * @return {Deferred.promise} promise Resolves to an array of categories.
				 */
				getCategories: function() {
					var categoryIds = this.get( 'categories' ),
						categories  = new wp.api.collections.Categories();

// Resolve with an empty array if no categories.
					if ( _.isEmpty( categoryIds ) ) {
						return jQuery.Deferred().resolve( [] );
					}

return categories.fetch( { data: { include: categoryIds } } );
				},

/**
				 * Set the categories for a post.
				 *
				 * Accepts an array of category slugs, or a Categories collection.
				 *
				 * @param {Array|Backbone.Collection} categories The categories to set on the post.
				 *
				 */
				setCategories: function( categories ) {
					var allCategories, newCategory,
						self = this,
						newCategories = [];

if ( _.isString( categories ) ) {
						return false;
					}

// If this is an array of slugs, build a collection.
					if ( _.isArray( categories ) ) {

// Get all the categories.
						allCategories = new wp.api.collections.Categories();
						allCategories.fetch( {
							data:    { per_page: 100 },
							success: function( allcats ) {

// Find the passed categories and set them up.
								_.each( categories, function( category ) {
									newCategory = new wp.api.models.Category( allcats.findWhere( { slug: category } ) );

// Tie the new category to the post.
									newCategory.set( 'parent_post', self.get( 'id' ) );

// Add the new category to the collection.
									newCategories.push( newCategory );
								} );
								categories = new wp.api.collections.Categories( newCategories );
								self.setCategoriesWithCollection( categories );
							}
						} );

} else {
						this.setCategoriesWithCollection( categories );
					}

/**
				 * Set the categories for a post.
				 *
				 * Accepts Categories collection.
				 *
				 * @param {Array|Backbone.Collection} categories The categories to set on the post.
				 *
				 */
				setCategoriesWithCollection: function( categories ) {

// Pluck out the category IDs.
					this.set( 'categories', categories.pluck( 'id' ) );
					return this.save();
				}
			},

/**
			 * Add a helper function to retrieve the author user model.
			 */
			AuthorMixin = {
				getAuthorUser: function() {
					return buildModelGetter( this, this.get( 'author' ), 'User', 'author', 'name' );
				}
			},

/**
			 * Add a helper function to retrieve the featured media.
			 */
			FeaturedMediaMixin = {
				getFeaturedMedia: function() {
					return buildModelGetter( this, this.get( 'featured_media' ), 'Media', 'wp:featuredmedia', 'source_url' );
				}
			};

// Exit if we don't have valid model defaults.
		if ( _.isUndefined( model.prototype.args ) ) {
			return model;
		}

// Go thru the parsable date fields, if our model contains any of them it gets the TimeStampedMixin.
		_.each( parseableDates, function( theDateKey ) {
			if ( ! _.isUndefined( model.prototype.args[ theDateKey ] ) ) {
				hasDate = true;
			}
		} );

// Add the TimeStampedMixin for models that contain a date field.
		if ( hasDate ) {
			model = model.extend( TimeStampedMixin );
		}

// Add the AuthorMixin for models that contain an author.
		if ( ! _.isUndefined( model.prototype.args.author ) ) {
			model = model.extend( AuthorMixin );
		}

// Add the FeaturedMediaMixin for models that contain a featured_media.
		if ( ! _.isUndefined( model.prototype.args.featured_media ) ) {
			model = model.extend( FeaturedMediaMixin );
		}

// Add the CategoriesMixin for models that support categories collections.
		if ( ! _.isUndefined( model.prototype.args.categories ) ) {
			model = model.extend( CategoriesMixin );
		}

// Add the MetaMixin for models that support meta.
		if ( ! _.isUndefined( model.prototype.args.meta ) ) {
			model = model.extend( MetaMixin );
		}

// Add the TagsMixin for models that support tags collections.
		if ( ! _.isUndefined( model.prototype.args.tags ) ) {
			model = model.extend( TagsMixin );
		}

// Add the RevisionsMixin for models that support revisions collections.
		if ( ! _.isUndefined( loadingObjects.collections[ modelClassName + 'Revisions' ] ) ) {
			model = model.extend( RevisionsMixin );
		}

return model;
	};

})( window );

/* global wpApiSettings:false */

// Suppress warning about parse function's unused "options" argument:
/* jshint unused:false */
(function() {

'use strict';

var wpApiSettings = window.wpApiSettings || {},
	trashableTypes    = [ 'Comment', 'Media', 'Comment', 'Post', 'Page', 'Status', 'Taxonomy', 'Type' ];

/**
	 * Backbone base model for all models.
	 */
	wp.api.WPApiBaseModel = Backbone.Model.extend(
		/** @lends WPApiBaseModel.prototype  */
		{

// Initialize the model.
			initialize: function() {

/**
				* Types that don't support trashing require passing ?force=true to delete.
				*
				*/
				if ( -1 === _.indexOf( trashableTypes, this.name ) ) {
					this.requireForceForDelete = true;
				}
			},

/**
			 * Set nonce header before every Backbone sync.
			 *
			 * @param {string} method.
			 * @param {Backbone.Model} model.
			 * @param {{beforeSend}, *} options.
			 * @return {*}.
			 */
			sync: function( method, model, options ) {
				var beforeSend;

options = options || {};

// Remove date_gmt if null.
				if ( _.isNull( model.get( 'date_gmt' ) ) ) {
					model.unset( 'date_gmt' );
				}

// Remove slug if empty.
				if ( _.isEmpty( model.get( 'slug' ) ) ) {
					model.unset( 'slug' );
				}

if ( _.isFunction( model.nonce ) && ! _.isEmpty( model.nonce() ) ) {
					beforeSend = options.beforeSend;

// @todo Enable option for jsonp endpoints.
					// options.dataType = 'jsonp';

// Include the nonce with requests.
					options.beforeSend = function( xhr ) {
						xhr.setRequestHeader( 'X-WP-Nonce', model.nonce() );

if ( beforeSend ) {
							return beforeSend.apply( this, arguments );
						}
					};

// Update the nonce when a new nonce is returned with the response.
					options.complete = function( xhr ) {
						var returnedNonce = xhr.getResponseHeader( 'X-WP-Nonce' );

if ( returnedNonce && _.isFunction( model.nonce ) && model.nonce() !== returnedNonce ) {
							model.endpointModel.set( 'nonce', returnedNonce );
						}
					};
				}

// Add '?force=true' to use delete method when required.
				if ( this.requireForceForDelete && 'delete' === method ) {
					model.url = model.url() + '?force=true';
				}
				return Backbone.sync( method, model, options );
			},

/**
			 * Save is only allowed when the PUT OR POST methods are available for the endpoint.
			 */
			save: function( attrs, options ) {

// Do we have the put method, then execute the save.
				if ( _.includes( this.methods, 'PUT' ) || _.includes( this.methods, 'POST' ) ) {

// Proxy the call to the original save function.
					return Backbone.Model.prototype.save.call( this, attrs, options );
				} else {

// Otherwise bail, disallowing action.
					return false;
				}
			},

/**
			 * Delete is only allowed when the DELETE method is available for the endpoint.
			 */
			destroy: function( options ) {

// Do we have the DELETE method, then execute the destroy.
				if ( _.includes( this.methods, 'DELETE' ) ) {

// Proxy the call to the original save function.
					return Backbone.Model.prototype.destroy.call( this, options );
				} else {

// Otherwise bail, disallowing action.
					return false;
				}
			}

}
	);

/**
	 * API Schema model. Contains meta information about the API.
	 */
	wp.api.models.Schema = wp.api.WPApiBaseModel.extend(
		/** @lends Schema.prototype  */
		{
			defaults: {
				_links: {},
				namespace: null,
				routes: {}
			},

initialize: function( attributes, options ) {
				var model = this;
				options = options || {};

wp.api.WPApiBaseModel.prototype.initialize.call( model, attributes, options );

model.apiRoot = options.apiRoot || wpApiSettings.root;
				model.versionString = options.versionString || wpApiSettings.versionString;
			},

url: function() {
				return this.apiRoot + this.versionString;
			}
		}
	);
})();

( function() {

'use strict';

var wpApiSettings = window.wpApiSettings || {};

/**
	 * Contains basic collection functionality such as pagination.
	 */
	wp.api.WPApiBaseCollection = Backbone.Collection.extend(
		/** @lends BaseCollection.prototype  */
		{

/**
			 * Setup default state.
			 */
			initialize: function( models, options ) {
				this.state = {
					data: {},
					currentPage: null,
					totalPages: null,
					totalObjects: null
				};
				if ( _.isUndefined( options ) ) {
					this.parent = '';
				} else {
					this.parent = options.parent;
				}
			},

/**
			 * Extend Backbone.Collection.sync to add nince and pagination support.
			 *
			 * Set nonce header before every Backbone sync.
			 *
			 * @param {string} method.
			 * @param {Backbone.Model} model.
			 * @param {{success}, *} options.
			 * @return {*}.
			 */
			sync: function( method, model, options ) {
				var beforeSend, success,
					self = this;

options = options || {};

if ( _.isFunction( model.nonce ) && ! _.isEmpty( model.nonce() ) ) {
					beforeSend = options.beforeSend;

// Include the nonce with requests.
					options.beforeSend = function( xhr ) {
						xhr.setRequestHeader( 'X-WP-Nonce', model.nonce() );

if ( beforeSend ) {
							return beforeSend.apply( self, arguments );
						}
					};

// Update the nonce when a new nonce is returned with the response.
					options.complete = function( xhr ) {
						var returnedNonce = xhr.getResponseHeader( 'X-WP-Nonce' );

if ( returnedNonce && _.isFunction( model.nonce ) && model.nonce() !== returnedNonce ) {
							model.endpointModel.set( 'nonce', returnedNonce );
						}
					};
				}

// When reading, add pagination data.
				if ( 'read' === method ) {
					if ( options.data ) {
						self.state.data = _.clone( options.data );

delete self.state.data.page;
					} else {
						self.state.data = options.data = {};
					}

if ( 'undefined' === typeof options.data.page ) {
						self.state.currentPage  = null;
						self.state.totalPages   = null;
						self.state.totalObjects = null;
					} else {
						self.state.currentPage = options.data.page - 1;
					}

success = options.success;
					options.success = function( data, textStatus, request ) {
						if ( ! _.isUndefined( request ) ) {
							self.state.totalPages   = parseInt( request.getResponseHeader( 'x-wp-totalpages' ), 10 );
							self.state.totalObjects = parseInt( request.getResponseHeader( 'x-wp-total' ), 10 );
						}

if ( null === self.state.currentPage ) {
							self.state.currentPage = 1;
						} else {
							self.state.currentPage++;
						}

if ( success ) {
							return success.apply( this, arguments );
						}
					};
				}

// Continue by calling Backbone's sync.
				return Backbone.sync( method, model, options );
			},

/**
			 * Fetches the next page of objects if a new page exists.
			 *
			 * @param {data: {page}} options.
			 * @return {*}.
			 */
			more: function( options ) {
				options = options || {};
				options.data = options.data || {};

_.extend( options.data, this.state.data );

if ( 'undefined' === typeof options.data.page ) {
					if ( ! this.hasMore() ) {
						return false;
					}

if ( null === this.state.currentPage || this.state.currentPage <= 1 ) {
						options.data.page = 2;
					} else {
						options.data.page = this.state.currentPage + 1;
					}
				}

return this.fetch( options );
			},

/**
			 * Returns true if there are more pages of objects available.
			 *
			 * @return {null|boolean}
			 */
			hasMore: function() {
				if ( null === this.state.totalPages ||
					 null === this.state.totalObjects ||
					 null === this.state.currentPage ) {
					return null;
				} else {
					return ( this.state.currentPage < this.state.totalPages );
				}
			}
		}
	);

} )();

( function() {

'use strict';

var Endpoint, initializedDeferreds = {},
		wpApiSettings = window.wpApiSettings || {};

/** @namespace wp */
	window.wp = window.wp || {};

/** @namespace wp.api */
	wp.api    = wp.api || {};

// If wpApiSettings is unavailable, try the default.
	if ( _.isEmpty( wpApiSettings ) ) {
		wpApiSettings.root = window.location.origin + '/wp-json/';
	}

Endpoint = Backbone.Model.extend(/** @lends Endpoint.prototype */{
		defaults: {
			apiRoot: wpApiSettings.root,
			versionString: wp.api.versionString,
			nonce: null,
			schema: null,
			models: {},
			collections: {}
		},

/**
		 * Initialize the Endpoint model.
		 */
		initialize: function() {
			var model = this, deferred;

Backbone.Model.prototype.initialize.apply( model, arguments );

deferred = jQuery.Deferred();
			model.schemaConstructed = deferred.promise();

model.schemaModel = new wp.api.models.Schema( null, {
				apiRoot:       model.get( 'apiRoot' ),
				versionString: model.get( 'versionString' ),
				nonce:         model.get( 'nonce' )
			} );

// When the model loads, resolve the promise.
			model.schemaModel.once( 'change', function() {
				model.constructFromSchema();
				deferred.resolve( model );
			} );

if ( model.get( 'schema' ) ) {

// Use schema supplied as model attribute.
				model.schemaModel.set( model.schemaModel.parse( model.get( 'schema' ) ) );
			} else if (
				! _.isUndefined( sessionStorage ) &&
				( _.isUndefined( wpApiSettings.cacheSchema ) || wpApiSettings.cacheSchema ) &&
				sessionStorage.getItem( 'wp-api-schema-model' + model.get( 'apiRoot' ) + model.get( 'versionString' ) )
			) {

// Used a cached copy of the schema model if available.
				model.schemaModel.set( model.schemaModel.parse( JSON.parse( sessionStorage.getItem( 'wp-api-schema-model' + model.get( 'apiRoot' ) + model.get( 'versionString' ) ) ) ) );
			} else {
				model.schemaModel.fetch( {
					/**
					 * When the server returns the schema model data, store the data in a sessionCache so we don't
					 * have to retrieve it again for this session. Then, construct the models and collections based
					 * on the schema model data.
					 *
					 * @ignore
					 */
					success: function( newSchemaModel ) {

// Store a copy of the schema model in the session cache if available.
						if ( ! _.isUndefined( sessionStorage ) && ( _.isUndefined( wpApiSettings.cacheSchema ) || wpApiSettings.cacheSchema ) ) {
							try {
								sessionStorage.setItem( 'wp-api-schema-model' + model.get( 'apiRoot' ) + model.get( 'versionString' ), JSON.stringify( newSchemaModel ) );
							} catch ( error ) {

// Fail silently, fixes errors in safari private mode.
							}
						}
					},

// Log the error condition.
					error: function( err ) {
						window.console.log( err );
					}
				} );
			}
		},

constructFromSchema: function() {
			var routeModel = this, modelRoutes, collectionRoutes, schemaRoot, loadingObjects,

/**
			 * Set up the model and collection name mapping options. As the schema is built, the
			 * model and collection names will be adjusted if they are found in the mapping object.
			 *
			 * Localizing a variable wpApiSettings.mapping will over-ride the default mapping options.
			 *
			 */
			mapping = wpApiSettings.mapping || {
				models: {
					'Categories':      'Category',
					'Comments':        'Comment',
					'Pages':           'Page',
					'PagesMeta':       'PageMeta',
					'PagesRevisions':  'PageRevision',
					'Posts':           'Post',
					'PostsCategories': 'PostCategory',
					'PostsRevisions':  'PostRevision',
					'PostsTags':       'PostTag',
					'Schema':          'Schema',
					'Statuses':        'Status',
					'Tags':            'Tag',
					'Taxonomies':      'Taxonomy',
					'Types':           'Type',
					'Users':           'User'
				},
				collections: {
					'PagesMeta':       'PageMeta',
					'PagesRevisions':  'PageRevisions',
					'PostsCategories': 'PostCategories',
					'PostsMeta':       'PostMeta',
					'PostsRevisions':  'PostRevisions',
					'PostsTags':       'PostTags'
				}
			},

modelEndpoints = routeModel.get( 'modelEndpoints' ),
			modelRegex     = new RegExp( '(?:.*[+)]|\/(' + modelEndpoints.join( '|' ) + '))$' );

/**
			 * Iterate thru the routes, picking up models and collections to build. Builds two arrays,
			 * one for models and one for collections.
			 */
			modelRoutes      = [];
			collectionRoutes = [];
			schemaRoot       = routeModel.get( 'apiRoot' ).replace( wp.api.utils.getRootUrl(), '' );
			loadingObjects   = {};

/**
			 * Tracking objects for models and collections.
			 */
			loadingObjects.models      = {};
			loadingObjects.collections = {};

_.each( routeModel.schemaModel.get( 'routes' ), function( route, index ) {

// Skip the schema root if included in the schema.
				if ( index !== routeModel.get( ' versionString' ) &&
						index !== schemaRoot &&
						index !== ( '/' + routeModel.get( 'versionString' ).slice( 0, -1 ) )
				) {

// Single items end with a regex, or a special case word.
					if ( modelRegex.test( index ) ) {
						modelRoutes.push( { index: index, route: route } );
					} else {

// Collections end in a name.
						collectionRoutes.push( { index: index, route: route } );
					}
				}
			} );

/**
			 * Construct the models.
			 *
			 * Base the class name on the route endpoint.
			 */
			_.each( modelRoutes, function( modelRoute ) {

// Extract the name and any parent from the route.
				var modelClassName,
					routeName  = wp.api.utils.extractRoutePart( modelRoute.index, 2, routeModel.get( 'versionString' ), true ),
					parentName = wp.api.utils.extractRoutePart( modelRoute.index, 1, routeModel.get( 'versionString' ), false ),
					routeEnd   = wp.api.utils.extractRoutePart( modelRoute.index, 1, routeModel.get( 'versionString' ), true );

// Clear the parent part of the rouite if its actually the version string.
				if ( parentName === routeModel.get( 'versionString' ) ) {
					parentName = '';
				}

// Handle the special case of the 'me' route.
				if ( 'me' === routeEnd ) {
					routeName = 'me';
				}

// If the model has a parent in its route, add that to its class name.
				if ( '' !== parentName && parentName !== routeName ) {
					modelClassName = wp.api.utils.capitalizeAndCamelCaseDashes( parentName ) + wp.api.utils.capitalizeAndCamelCaseDashes( routeName );
					modelClassName = mapping.models[ modelClassName ] || modelClassName;
					loadingObjects.models[ modelClassName ] = wp.api.WPApiBaseModel.extend( {

// Return a constructed url based on the parent and id.
						url: function() {
							var url =
								routeModel.get( 'apiRoot' ) +
								routeModel.get( 'versionString' ) +
								parentName +  '/' +
									( ( _.isUndefined( this.get( 'parent' ) ) || 0 === this.get( 'parent' ) ) ?
										( _.isUndefined( this.get( 'parent_post' ) ) ? '' : this.get( 'parent_post' ) + '/' ) :
										this.get( 'parent' ) + '/' ) +
								routeName;

if ( ! _.isUndefined( this.get( 'id' ) ) ) {
								url +=  '/' + this.get( 'id' );
							}
							return url;
						},

// Track nonces on the Endpoint 'routeModel'.
						nonce: function() {
							return routeModel.get( 'nonce' );
						},

endpointModel: routeModel,

// Include a reference to the original route object.
						route: modelRoute,

// Include a reference to the original class name.
						name: modelClassName,

// Include the array of route methods for easy reference.
						methods: modelRoute.route.methods,

// Include the array of route endpoints for easy reference.
						endpoints: modelRoute.route.endpoints
					} );
				} else {

// This is a model without a parent in its route.
					modelClassName = wp.api.utils.capitalizeAndCamelCaseDashes( routeName );
					modelClassName = mapping.models[ modelClassName ] || modelClassName;
					loadingObjects.models[ modelClassName ] = wp.api.WPApiBaseModel.extend( {

// Function that returns a constructed url based on the ID.
						url: function() {
							var url = routeModel.get( 'apiRoot' ) +
								routeModel.get( 'versionString' ) +
								( ( 'me' === routeName ) ? 'users/me' : routeName );

if ( ! _.isUndefined( this.get( 'id' ) ) ) {
								url +=  '/' + this.get( 'id' );
							}
							return url;
						},

// Track nonces at the Endpoint level.
						nonce: function() {
							return routeModel.get( 'nonce' );
						},

endpointModel: routeModel,

// Include a reference to the original route object.
						route: modelRoute,

// Include a reference to the original class name.
						name: modelClassName,

// Include the array of route methods for easy reference.
						methods: modelRoute.route.methods,

// Include the array of route endpoints for easy reference.
						endpoints: modelRoute.route.endpoints
					} );
				}

// Add defaults to the new model, pulled form the endpoint.
				wp.api.utils.decorateFromRoute(
					modelRoute.route.endpoints,
					loadingObjects.models[ modelClassName ],
					routeModel.get( 'versionString' )
				);

} );

/**
			 * Construct the collections.
			 *
			 * Base the class name on the route endpoint.
			 */
			_.each( collectionRoutes, function( collectionRoute ) {

// Extract the name and any parent from the route.
				var collectionClassName, modelClassName,
						routeName  = collectionRoute.index.slice( collectionRoute.index.lastIndexOf( '/' ) + 1 ),
						parentName = wp.api.utils.extractRoutePart( collectionRoute.index, 1, routeModel.get( 'versionString' ), false );

// If the collection has a parent in its route, add that to its class name.
				if ( '' !== parentName && parentName !== routeName && routeModel.get( 'versionString' ) !== parentName ) {

collectionClassName = wp.api.utils.capitalizeAndCamelCaseDashes( parentName ) + wp.api.utils.capitalizeAndCamelCaseDashes( routeName );
					modelClassName      = mapping.models[ collectionClassName ] || collectionClassName;
					collectionClassName = mapping.collections[ collectionClassName ] || collectionClassName;
					loadingObjects.collections[ collectionClassName ] = wp.api.WPApiBaseCollection.extend( {

// Function that returns a constructed url passed on the parent.
						url: function() {
							return routeModel.get( 'apiRoot' ) + routeModel.get( 'versionString' ) +
								parentName + '/' +
								( ( _.isUndefined( this.parent ) || '' === this.parent ) ?
									( _.isUndefined( this.get( 'parent_post' ) ) ? '' : this.get( 'parent_post' ) + '/' ) :
									this.parent + '/' ) +
								routeName;
						},

// Specify the model that this collection contains.
						model: function( attrs, options ) {
							return new loadingObjects.models[ modelClassName ]( attrs, options );
						},

// Track nonces at the Endpoint level.
						nonce: function() {
							return routeModel.get( 'nonce' );
						},

endpointModel: routeModel,

// Include a reference to the original class name.
						name: collectionClassName,

// Include a reference to the original route object.
						route: collectionRoute,

// Include the array of route methods for easy reference.
						methods: collectionRoute.route.methods
					} );
				} else {

// This is a collection without a parent in its route.
					collectionClassName = wp.api.utils.capitalizeAndCamelCaseDashes( routeName );
					modelClassName      = mapping.models[ collectionClassName ] || collectionClassName;
					collectionClassName = mapping.collections[ collectionClassName ] || collectionClassName;
					loadingObjects.collections[ collectionClassName ] = wp.api.WPApiBaseCollection.extend( {

// For the url of a root level collection, use a string.
						url: function() {
							return routeModel.get( 'apiRoot' ) + routeModel.get( 'versionString' ) + routeName;
						},

// Specify the model that this collection contains.
						model: function( attrs, options ) {
							return new loadingObjects.models[ modelClassName ]( attrs, options );
						},

// Track nonces at the Endpoint level.
						nonce: function() {
							return routeModel.get( 'nonce' );
						},

endpointModel: routeModel,

// Include a reference to the original class name.
						name: collectionClassName,

// Include a reference to the original route object.
						route: collectionRoute,

// Include the array of route methods for easy reference.
						methods: collectionRoute.route.methods
					} );
				}

// Add defaults to the new model, pulled form the endpoint.
				wp.api.utils.decorateFromRoute( collectionRoute.route.endpoints, loadingObjects.collections[ collectionClassName ] );
			} );

// Add mixins and helpers for each of the models.
			_.each( loadingObjects.models, function( model, index ) {
				loadingObjects.models[ index ] = wp.api.utils.addMixinsAndHelpers( model, index, loadingObjects );
			} );

// Set the routeModel models and collections.
			routeModel.set( 'models', loadingObjects.models );
			routeModel.set( 'collections', loadingObjects.collections );

}

} );

wp.api.endpoints = new Backbone.Collection();

/**
	 * Initialize the wp-api, optionally passing the API root.
	 *
	 * @param {Object} [args]
	 * @param {string} [args.nonce] The nonce. Optional, defaults to wpApiSettings.nonce.
	 * @param {string} [args.apiRoot] The api root. Optional, defaults to wpApiSettings.root.
	 * @param {string} [args.versionString] The version string. Optional, defaults to wpApiSettings.root.
	 * @param {Object} [args.schema] The schema. Optional, will be fetched from API if not provided.
	 */
	wp.api.init = function( args ) {
		var endpoint, attributes = {}, deferred, promise;

args                      = args || {};
		attributes.nonce          = _.isString( args.nonce ) ? args.nonce : ( wpApiSettings.nonce || '' );
		attributes.apiRoot        = args.apiRoot || wpApiSettings.root || '/wp-json';
		attributes.versionString  = args.versionString || wpApiSettings.versionString || 'wp/v2/';
		attributes.schema         = args.schema || null;
		attributes.modelEndpoints = args.modelEndpoints || [ 'me', 'settings' ];
		if ( ! attributes.schema && attributes.apiRoot === wpApiSettings.root && attributes.versionString === wpApiSettings.versionString ) {
			attributes.schema = wpApiSettings.schema;
		}

if ( ! initializedDeferreds[ attributes.apiRoot + attributes.versionString ] ) {

// Look for an existing copy of this endpoint.
			endpoint = wp.api.endpoints.findWhere( { 'apiRoot': attributes.apiRoot, 'versionString': attributes.versionString } );
			if ( ! endpoint ) {
				endpoint = new Endpoint( attributes );
			}
			deferred = jQuery.Deferred();
			promise = deferred.promise();

endpoint.schemaConstructed.done( function( resolvedEndpoint ) {
				wp.api.endpoints.add( resolvedEndpoint );

// Map the default endpoints, extending any already present items (including Schema model).
				wp.api.models      = _.extend( wp.api.models, resolvedEndpoint.get( 'models' ) );
				wp.api.collections = _.extend( wp.api.collections, resolvedEndpoint.get( 'collections' ) );
				deferred.resolve( resolvedEndpoint );
			} );
			initializedDeferreds[ attributes.apiRoot + attributes.versionString ] = promise;
		}
		return initializedDeferreds[ attributes.apiRoot + attributes.versionString ];
	};

/**
	 * Construct the default endpoints and add to an endpoints collection.
	 */

// The wp.api.init function returns a promise that will resolve with the endpoint once it is ready.
	wp.api.loadPromise = wp.api.init();

} )();

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