/**
 * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @fileOverview The "filebrowser" plugin that adds support for file uploads and
 *               browsing.
 *
 * When a file is uploaded or selected inside the file browser, its URL is
 * inserted automatically into a field defined in the <code>filebrowser</code>
 * attribute. In order to specify a field that should be updated, pass the tab ID and
 * the element ID, separated with a colon.<br /><br />
 *
 * <strong>Example 1: (Browse)</strong>
 *
 * <pre>
 * {
 * 	type : 'button',
 * 	id : 'browse',
 * 	filebrowser : 'tabId:elementId',
 * 	label : editor.lang.common.browseServer
 * }
 * </pre>
 *
 * If you set the <code>filebrowser</code> attribute for an element other than
 * the <code>fileButton</code>, the <code>Browse</code> action will be triggered.<br /><br />
 *
 * <strong>Example 2: (Quick Upload)</strong>
 *
 * <pre>
 * {
 * 	type : 'fileButton',
 * 	id : 'uploadButton',
 * 	filebrowser : 'tabId:elementId',
 * 	label : editor.lang.common.uploadSubmit,
 * 	'for' : [ 'upload', 'upload' ]
 * }
 * </pre>
 *
 * If you set the <code>filebrowser</code> attribute for a <code>fileButton</code>
 * element, the <code>QuickUpload</code> action will be executed.<br /><br />
 *
 * The filebrowser plugin also supports more advanced configuration performed through
 * a JavaScript object.
 *
 * The following settings are supported:
 *
 * <ul>
 * <li><code>action</code> &ndash; <code>Browse</code> or <code>QuickUpload</code>.</li>
 * <li><code>target</code> &ndash; the field to update in the <code><em>tabId:elementId</em></code> format.</li>
 * <li><code>params</code> &ndash; additional arguments to be passed to the server connector (optional).</li>
 * <li><code>onSelect</code> &ndash; a function to execute when the file is selected/uploaded (optional).</li>
 * <li><code>url</code> &ndash; the URL to be called (optional).</li>
 * </ul>
 *
 * <strong>Example 3: (Quick Upload)</strong>
 *
 * <pre>
 * {
 * 	type : 'fileButton',
 * 	label : editor.lang.common.uploadSubmit,
 * 	id : 'buttonId',
 * 	filebrowser :
 * 	{
 * 		action : 'QuickUpload', // required
 * 		target : 'tab1:elementId', // required
 * 		params : // optional
 * 		{
 * 			type : 'Files',
 * 			currentFolder : '/folder/'
 * 		},
 * 		onSelect : function( fileUrl, errorMessage ) // optional
 * 		{
 * 			// Do not call the built-in selectFuntion.
 * 			// return false;
 * 		}
 * 	},
 * 	'for' : [ 'tab1', 'myFile' ]
 * }
 * </pre>
 *
 * Suppose you have a file element with an ID of <code>myFile</code>, a text
 * field with an ID of <code>elementId</code> and a <code>fileButton</code>.
 * If the <code>filebowser.url</code> attribute is not specified explicitly,
 * the form action will be set to <code>filebrowser[<em>DialogWindowName</em>]UploadUrl</code>
 * or, if not specified, to <code>filebrowserUploadUrl</code>. Additional parameters
 * from the <code>params</code> object will be added to the query string. It is
 * possible to create your own <code>uploadHandler</code> and cancel the built-in
 * <code>updateTargetElement</code> command.<br /><br />
 *
 * <strong>Example 4: (Browse)</strong>
 *
 * <pre>
 * {
 * 	type : 'button',
 * 	id : 'buttonId',
 * 	label : editor.lang.common.browseServer,
 * 	filebrowser :
 * 	{
 * 		action : 'Browse',
 * 		url : '/ckfinder/ckfinder.html&amp;type=Images',
 * 		target : 'tab1:elementId'
 * 	}
 * }
 * </pre>
 *
 * In this example, when the button is pressed, the file browser will be opened in a
 * popup window. If you do not specify the <code>filebrowser.url</code> attribute,
 * <code>filebrowser[<em>DialogName</em>]BrowseUrl</code> or
 * <code>filebrowserBrowseUrl</code> will be used. After selecting a file in the file
 * browser, an element with an ID of <code>elementId</code> will be updated. Just
 * like in the third example, a custom <code>onSelect</code> function may be defined.
 */

( function() {
	'use strict';
	// Default input element name for CSRF protection token.
	var TOKEN_INPUT_NAME = 'ckCsrfToken';

	// Adds (additional) arguments to given url.
	//
	// @param {String}
	//            url The url.
	// @param {Object}
	//            params Additional parameters.
	function addQueryString( url, params ) {
		var queryString = [];

		if ( !params )
			return url;
		else {
			for ( var i in params )
				queryString.push( i + '=' + encodeURIComponent( params[ i ] ) );
		}

		return url + ( ( url.indexOf( '?' ) != -1 ) ? '&' : '?' ) + queryString.join( '&' );
	}

	// Function sniffs for CKFinder URLs, and adds required parameters if needed (#1835).
	//
	// @since 4.9.1
	// @param {String} url CKFinder's URL.
	// @returns {String} Decorated URL.
	function addMissingParams( url ) {
		if ( !url.match( /command=QuickUpload/ ) || url.match( /(\?|&)responseType=json/ ) ) {
			return url;
		}

		return addQueryString( url, { responseType: 'json' } );
	}

	// Make a string's first character uppercase.
	//
	// @param {String}
	//            str String.
	function ucFirst( str ) {
		str += '';
		var f = str.charAt( 0 ).toUpperCase();
		return f + str.substr( 1 );
	}

	// The onlick function assigned to the 'Browse Server' button. Opens the
	// file browser and updates target field when file is selected.
	//
	// @param {CKEDITOR.event}
	//            evt The event object.
	function browseServer() {
		var dialog = this.getDialog();
		var editor = dialog.getParentEditor();

		editor._.filebrowserSe = this;

		var width = editor.config[ 'filebrowser' + ucFirst( dialog.getName() ) + 'WindowWidth' ] || editor.config.filebrowserWindowWidth || '80%';
		var height = editor.config[ 'filebrowser' + ucFirst( dialog.getName() ) + 'WindowHeight' ] || editor.config.filebrowserWindowHeight || '70%';

		var params = this.filebrowser.params || {};
		params.CKEditor = editor.name;
		params.CKEditorFuncNum = editor._.filebrowserFn;
		if ( !params.langCode )
			params.langCode = editor.langCode;

		var url = addQueryString( this.filebrowser.url, params );
		// TODO: V4: Remove backward compatibility (https://dev.ckeditor.com/ticket/8163).
		editor.popup( url, width, height, editor.config.filebrowserWindowFeatures || editor.config.fileBrowserWindowFeatures );
	}

	// Appends token preventing CSRF attacks to the form of provided file input.
	//
	// @since 4.5.6
	// @param {CKEDITOR.dom.element} fileInput
	function appendToken( fileInput ) {
		var tokenElement;
		var form = new CKEDITOR.dom.element( fileInput.$.form );

		if ( form ) {
			// Check if token input element already exists.
			tokenElement = form.$.elements[ TOKEN_INPUT_NAME ];

			// Create new if needed.
			if ( !tokenElement ) {
				tokenElement = new CKEDITOR.dom.element( 'input' );
				tokenElement.setAttributes( {
					name: TOKEN_INPUT_NAME,
					type: 'hidden'
				} );

				form.append( tokenElement );
			} else {
				tokenElement = new CKEDITOR.dom.element( tokenElement );
			}

			tokenElement.setAttribute( 'value', CKEDITOR.tools.getCsrfToken() );
		}
	}

	// The onclick function assigned to the 'Upload' button. Makes the final
	// decision whether form is really submitted and updates target field when
	// file is uploaded.
	//
	// @param {CKEDITOR.event}
	//            evt The event object.
	function uploadFile() {
		var dialog = this.getDialog();
		var editor = dialog.getParentEditor();

		editor._.filebrowserSe = this;

		// If user didn't select the file, stop the upload.
		if ( !dialog.getContentElement( this[ 'for' ][ 0 ], this[ 'for' ][ 1 ] ).getInputElement().$.value )
			return false;

		if ( !dialog.getContentElement( this[ 'for' ][ 0 ], this[ 'for' ][ 1 ] ).getAction() )
			return false;

		return true;
	}

	// Setups the file element.
	//
	// @param {CKEDITOR.ui.dialog.file}
	//            fileInput The file element used during file upload.
	// @param {Object}
	//            filebrowser Object containing filebrowser settings assigned to
	//            the fileButton associated with this file element.
	function setupFileElement( editor, fileInput, filebrowser ) {
		var params = filebrowser.params || {};
		params.CKEditor = editor.name;
		params.CKEditorFuncNum = editor._.filebrowserFn;
		if ( !params.langCode )
			params.langCode = editor.langCode;

		fileInput.action = addQueryString( filebrowser.url, params );
		fileInput.filebrowser = filebrowser;
	}

	// Traverse through the content definition and attach filebrowser to
	// elements with 'filebrowser' attribute.
	//
	// @param String
	//            dialogName Dialog name.
	// @param {CKEDITOR.dialog.definitionObject}
	//            definition Dialog definition.
	// @param {Array}
	//            elements Array of {@link CKEDITOR.dialog.definition.content}
	//            objects.
	function attachFileBrowser( editor, dialogName, definition, elements ) {
		if ( !elements || !elements.length )
			return;

		var element;

		for ( var i = elements.length; i--; ) {
			element = elements[ i ];

			if ( element.type == 'hbox' || element.type == 'vbox' || element.type == 'fieldset' )
				attachFileBrowser( editor, dialogName, definition, element.children );

			if ( !element.filebrowser )
				continue;

			if ( typeof element.filebrowser == 'string' ) {
				var fb = {
					action: ( element.type == 'fileButton' ) ? 'QuickUpload' : 'Browse',
					target: element.filebrowser
				};
				element.filebrowser = fb;
			}

			if ( element.filebrowser.action == 'Browse' ) {
				var url = element.filebrowser.url;
				if ( url === undefined ) {
					url = editor.config[ 'filebrowser' + ucFirst( dialogName ) + 'BrowseUrl' ];
					if ( url === undefined )
						url = editor.config.filebrowserBrowseUrl;
				}

				if ( url ) {
					element.onClick = browseServer;
					element.filebrowser.url = url;
					element.hidden = false;
				}
			} else if ( element.filebrowser.action == 'QuickUpload' && element[ 'for' ] ) {
				url = element.filebrowser.url;
				if ( url === undefined ) {
					url = editor.config[ 'filebrowser' + ucFirst( dialogName ) + 'UploadUrl' ];
					if ( url === undefined )
						url = editor.config.filebrowserUploadUrl;
				}

				if ( url ) {
					var onClick = element.onClick;

					// "element" here means the definition object, so we need to find the correct
					// button to scope the event call
					element.onClick = function( evt ) {
						var sender = evt.sender,
							fileInput = sender.getDialog().getContentElement( this[ 'for' ][ 0 ], this[ 'for' ][ 1 ] ).getInputElement(),
							isFileUploadApiSupported = CKEDITOR.fileTools && CKEDITOR.fileTools.isFileUploadSupported;

						if ( onClick && onClick.call( sender, evt ) === false ) {
							return false;
						}

						if ( uploadFile.call( sender, evt ) ) {
							// Use one of two upload strategies, either form or XHR based (#643).
							if ( editor.config.filebrowserUploadMethod === 'form' || !isFileUploadApiSupported ) {
								// Append token preventing CSRF attacks.
								appendToken( fileInput );
								return true;
							} else {
								var loader = editor.uploadRepository.create( fileInput.$.files[ 0 ] );

								loader.on( 'uploaded', function( evt ) {
									var response = evt.sender.responseData;
									setUrl.call( evt.sender.editor, response.url, response.message );
								} );

								// Return non-false value will disable fileButton in dialogui,
								// below listeners takes care of such situation and re-enable "send" button.
								loader.on( 'error', xhrUploadErrorHandler.bind( this ) );
								loader.on( 'abort', xhrUploadErrorHandler.bind( this ) );

								loader.loadAndUpload( addMissingParams( url ) );

								return 'xhr';
							}
						}
						return false;
					};

					element.filebrowser.url = url;
					element.hidden = false;
					setupFileElement( editor, definition.getContents( element[ 'for' ][ 0 ] ).get( element[ 'for' ][ 1 ] ), element.filebrowser );
				}
			}
		}
	}

	function xhrUploadErrorHandler( evt ) {
		var response = {};

		try {
			response = JSON.parse( evt.sender.xhr.response ) || {};
		} catch ( e ) {}

		// `this` is a reference to ui.dialog.fileButton.
		this.enable();
		alert( response.error ? response.error.message : evt.sender.message ); // jshint ignore:line
	}

	// Updates the target element with the url of uploaded/selected file.
	//
	// @param {String}
	//            url The url of a file.
	function updateTargetElement( url, sourceElement ) {
		var dialog = sourceElement.getDialog();
		var targetElement = sourceElement.filebrowser.target || null;

		// If there is a reference to targetElement, update it.
		if ( targetElement ) {
			var target = targetElement.split( ':' );
			var element = dialog.getContentElement( target[ 0 ], target[ 1 ] );
			if ( element ) {
				element.setValue( url );
				dialog.selectPage( target[ 0 ] );
			}
		}
	}

	// Returns true if filebrowser is configured in one of the elements.
	//
	// @param {CKEDITOR.dialog.definitionObject}
	//            definition Dialog definition.
	// @param String
	//            tabId The tab id where element(s) can be found.
	// @param String
	//            elementId The element id (or ids, separated with a semicolon) to check.
	function isConfigured( definition, tabId, elementId ) {
		if ( elementId.indexOf( ';' ) !== -1 ) {
			var ids = elementId.split( ';' );
			for ( var i = 0; i < ids.length; i++ ) {
				if ( isConfigured( definition, tabId, ids[ i ] ) )
					return true;
			}
			return false;
		}

		var elementFileBrowser = definition.getContents( tabId ).get( elementId ).filebrowser;
		return ( elementFileBrowser && elementFileBrowser.url );
	}

	function setUrl( fileUrl, data ) {
		var dialog = this._.filebrowserSe.getDialog(),
			targetInput = this._.filebrowserSe[ 'for' ],
			onSelect = this._.filebrowserSe.filebrowser.onSelect;

		if ( targetInput )
			dialog.getContentElement( targetInput[ 0 ], targetInput[ 1 ] ).reset();

		if ( typeof data == 'function' && data.call( this._.filebrowserSe ) === false )
			return;

		if ( onSelect && onSelect.call( this._.filebrowserSe, fileUrl, data ) === false )
			return;

		// The "data" argument may be used to pass the error message to the editor.
		if ( typeof data == 'string' && data )
			alert( data ); // jshint ignore:line

		if ( fileUrl )
			updateTargetElement( fileUrl, this._.filebrowserSe );
	}

	CKEDITOR.plugins.add( 'filebrowser', {
		requires: 'popup,filetools',
		init: function( editor ) {
			editor._.filebrowserFn = CKEDITOR.tools.addFunction( setUrl, editor );
			editor.on( 'destroy', function() {
				CKEDITOR.tools.removeFunction( this._.filebrowserFn );
			} );
		}
	} );

	CKEDITOR.on( 'dialogDefinition', function( evt ) {
		// We require filebrowser plugin to be loaded.
		if ( !evt.editor.plugins.filebrowser )
			return;

		var definition = evt.data.definition,
			element;
		// Associate filebrowser to elements with 'filebrowser' attribute.
		for ( var i = 0; i < definition.contents.length; ++i ) {
			if ( ( element = definition.contents[ i ] ) ) {
				attachFileBrowser( evt.editor, evt.data.name, definition, element.elements );
				if ( element.hidden && element.filebrowser )
					element.hidden = !isConfigured( definition, element.id, element.filebrowser );

			}
		}
	} );

} )();

/**
 * The location of an external file manager that should be launched when the **Browse Server**
 * button is pressed. If configured, the **Browse Server** button will appear in the
 * **Link**, **Image**, and **Flash** dialog windows.
 *
 * Read more in the {@glink guide/dev_file_browse_upload documentation}
 * and see the [SDK sample](https://sdk.ckeditor.com/samples/fileupload.html).
 *
 *		config.filebrowserBrowseUrl = '/browser/browse.php';
 *
 * @since 3.0
 * @cfg {String} [filebrowserBrowseUrl='' (empty string = disabled)]
 * @member CKEDITOR.config
 */

/**
 * The location of the script that handles file uploads.
 * If set, the **Upload** tab will appear in the **Link**, **Image**,
 * and **Flash** dialog windows.
 *
 * Read more in the {@glink guide/dev_file_browse_upload documentation}
 * and see the [SDK sample](https://sdk.ckeditor.com/samples/fileupload.html).
 *
 *		config.filebrowserUploadUrl = '/uploader/upload.php';
 *
 * **Note:** This is a configuration setting for a {@glink guide/dev_file_browse_upload file browser/uploader}.
 * To configure {@glink guide/dev_file_upload uploading dropped or pasted files} use the {@link CKEDITOR.config#uploadUrl}
 * configuration option.
 *
 * @since 3.0
 * @cfg {String} [filebrowserUploadUrl='' (empty string = disabled)]
 * @member CKEDITOR.config
 */

/**
 * The location of an external file manager that should be launched when the **Browse Server**
 * button is pressed in the **Image** dialog window.
 *
 * If not set, CKEditor will use {@link CKEDITOR.config#filebrowserBrowseUrl}.
 *
 * Read more in the [documentation](#!/guide/dev_file_manager_configuration-section-adding-file-manager-scripts-for-selected-dialog-windows)
 * and see the [SDK sample](https://sdk.ckeditor.com/samples/fileupload.html).
 *
 *		config.filebrowserImageBrowseUrl = '/browser/browse.php?type=Images';
 *
 * @since 3.0
 * @cfg {String} [filebrowserImageBrowseUrl='' (empty string = disabled)]
 * @member CKEDITOR.config
 */

/**
 * The location of an external file browser that should be launched when the **Browse Server**
 * button is pressed in the **Flash** dialog window.
 *
 * If not set, CKEditor will use {@link CKEDITOR.config#filebrowserBrowseUrl}.
 *
 * Read more in the [documentation](#!/guide/dev_file_manager_configuration-section-adding-file-manager-scripts-for-selected-dialog-windows)
 * and see the [SDK sample](https://sdk.ckeditor.com/samples/fileupload.html).
 *
 *		config.filebrowserFlashBrowseUrl = '/browser/browse.php?type=Flash';
 *
 * @since 3.0
 * @cfg {String} [filebrowserFlashBrowseUrl='' (empty string = disabled)]
 * @member CKEDITOR.config
 */

/**
 * The location of the script that handles file uploads in the **Image** dialog window.
 *
 * If not set, CKEditor will use {@link CKEDITOR.config#filebrowserUploadUrl}.
 *
 * Read more in the [documentation](#!/guide/dev_file_manager_configuration-section-adding-file-manager-scripts-for-selected-dialog-windows)
 * and see the [SDK sample](https://sdk.ckeditor.com/samples/fileupload.html).
 *
 *		config.filebrowserImageUploadUrl = '/uploader/upload.php?type=Images';
 *
 * **Note:** This is a configuration setting for a {@glink guide/dev_file_browse_upload file browser/uploader}.
 * To configure {@glink guide/dev_file_upload uploading dropped or pasted files} use the {@link CKEDITOR.config#uploadUrl}
 * or {@link CKEDITOR.config#imageUploadUrl} configuration option.
 *
 * @since 3.0
 * @cfg {String} [filebrowserImageUploadUrl='' (empty string = disabled)]
 * @member CKEDITOR.config
 */

/**
 * The location of the script that handles file uploads in the **Flash** dialog window.
 *
 * If not set, CKEditor will use {@link CKEDITOR.config#filebrowserUploadUrl}.
 *
 * Read more in the [documentation](#!/guide/dev_file_manager_configuration-section-adding-file-manager-scripts-for-selected-dialog-windows)
 * and see the [SDK sample](https://sdk.ckeditor.com/samples/fileupload.html).
 *
 *		config.filebrowserFlashUploadUrl = '/uploader/upload.php?type=Flash';
 *
 * @since 3.0
 * @cfg {String} filebrowserFlashUploadUrl='' (empty string = disabled)]
 * @member CKEDITOR.config
 */

/**
 * The location of an external file manager that should be launched when the **Browse Server**
 * button is pressed in the **Link** tab of the **Image** dialog window.
 *
 * If not set, CKEditor will use {@link CKEDITOR.config#filebrowserBrowseUrl}.
 *
 * Read more in the [documentation](#!/guide/dev_file_manager_configuration-section-adding-file-manager-scripts-for-selected-dialog-windows)
 * and see the [SDK sample](https://sdk.ckeditor.com/samples/fileupload.html).
 *
 *		config.filebrowserImageBrowseLinkUrl = '/browser/browse.php';
 *
 * @since 3.2
 * @cfg {String} [filebrowserImageBrowseLinkUrl='' (empty string = disabled)]
 * @member CKEDITOR.config
 */

/**
 * The features to use in the file manager popup window.
 *
 *		config.filebrowserWindowFeatures = 'resizable=yes,scrollbars=no';
 *
 * @since 3.4.1
 * @cfg {String} [filebrowserWindowFeatures='location=no,menubar=no,toolbar=no,dependent=yes,minimizable=no,modal=yes,alwaysRaised=yes,resizable=yes,scrollbars=yes']
 * @member CKEDITOR.config
 */

/**
 * The width of the file manager popup window. It can be a number denoting a value in
 * pixels or a percent string.
 *
 * Read more in the [documentation](#!/guide/dev_file_manager_configuration-section-file-manager-window-size)
 * and see the [SDK sample](https://sdk.ckeditor.com/samples/fileupload.html).
 *
 *		config.filebrowserWindowWidth = 750;
 *
 *		config.filebrowserWindowWidth = '50%';
 *
 * @cfg {Number/String} [filebrowserWindowWidth='80%']
 * @member CKEDITOR.config
 */

/**
 * The height of the file manager popup window. It can be a number denoting a value in
 * pixels or a percent string.
 *
 * Read more in the [documentation](#!/guide/dev_file_manager_configuration-section-file-manager-window-size)
 * and see the [SDK sample](https://sdk.ckeditor.com/samples/fileupload.html).
 *
 *		config.filebrowserWindowHeight = 580;
 *
 *		config.filebrowserWindowHeight = '50%';
 *
 * @cfg {Number/String} [filebrowserWindowHeight='70%']
 * @member CKEDITOR.config
 */

/**
 * Defines a preferred option for file uploading in the [File Browser](https://ckeditor.com/cke4/addon/filebrowser) plugin.
 *
 * Available values:
 *
 *	* `'xhr'` &ndash; XMLHttpRequest is used to upload the file. Using this option allows to set additional XHR headers with
 * the {@link CKEDITOR.config#fileTools_requestHeaders} option.
 *	* `'form'` &ndash; The file is uploaded by submitting a traditional `<form>` element. **Note: That was the only option available until CKEditor 4.9.0.**
 *
 * Example:
 *
 *		// All browsers will use a plain form element to upload the file.
 *		config.filebrowserUploadMethod = 'form';
 *
 * @since 4.9.0
 * @cfg {String} [filebrowserUploadMethod='xhr']
 * @member CKEDITOR.config
 */
