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Upload File : |
/**
* Provides an interface for uploading files to MediaWiki.
*
* @class mw.Api.plugin.upload
* @singleton
*/
( function ( mw, $ ) {
var nonce = 0,
fieldsAllowed = {
stash: true,
filekey: true,
filename: true,
comment: true,
text: true,
watchlist: true,
ignorewarnings: true
};
/**
* Get nonce for iframe IDs on the page.
*
* @private
* @return {number}
*/
function getNonce() {
return nonce++;
}
/**
* Given a non-empty object, return one of its keys.
*
* @private
* @param {Object} obj
* @return {string}
*/
function getFirstKey( obj ) {
for ( var key in obj ) {
if ( obj.hasOwnProperty( key ) ) {
return key;
}
}
}
/**
* Get new iframe object for an upload.
*
* @private
* @return {HTMLIframeElement}
*/
function getNewIframe( id ) {
var frame = document.createElement( 'iframe' );
frame.id = id;
frame.name = id;
return frame;
}
/**
* Shortcut for getting hidden inputs
*
* @private
* @return {jQuery}
*/
function getHiddenInput( name, val ) {
return $( '<input>' ).attr( 'type', 'hidden' )
.attr( 'name', name )
.val( val );
}
/**
* Process the result of the form submission, returned to an iframe.
* This is the iframe's onload event.
*
* @param {HTMLIframeElement} iframe Iframe to extract result from
* @return {Object} Response from the server. The return value may or may
* not be an XMLDocument, this code was copied from elsewhere, so if you
* see an unexpected return type, please file a bug.
*/
function processIframeResult( iframe ) {
var json,
doc = iframe.contentDocument || frames[ iframe.id ].document;
if ( doc.XMLDocument ) {
// The response is a document property in IE
return doc.XMLDocument;
}
if ( doc.body ) {
// Get the json string
// We're actually searching through an HTML doc here --
// according to mdale we need to do this
// because IE does not load JSON properly in an iframe
json = $( doc.body ).find( 'pre' ).text();
return JSON.parse( json );
}
// Response is a xml document
return doc;
}
function formDataAvailable() {
return window.FormData !== undefined &&
window.File !== undefined &&
window.File.prototype.slice !== undefined;
}
$.extend( mw.Api.prototype, {
/**
* Upload a file to MediaWiki.
*
* The file will be uploaded using AJAX and FormData, if the browser supports it, or via an
* iframe if it doesn't.
*
* Caveats of iframe upload:
* - The returned jQuery.Promise will not receive `progress` notifications during the upload
* - It is incompatible with uploads to a foreign wiki using mw.ForeignApi
* - You must pass a HTMLInputElement and not a File for it to be possible
*
* @param {HTMLInputElement|File|Blob} file HTML input type=file element with a file already inside
* of it, or a File object.
* @param {Object} data Other upload options, see action=upload API docs for more
* @return {jQuery.Promise}
*/
upload: function ( file, data ) {
var isFileInput, canUseFormData;
isFileInput = file && file.nodeType === Node.ELEMENT_NODE;
if ( formDataAvailable() && isFileInput && file.files ) {
file = file.files[ 0 ];
}
if ( !file ) {
throw new Error( 'No file' );
}
// Blobs are allowed in formdata uploads, it turns out
canUseFormData = formDataAvailable() && ( file instanceof window.File || file instanceof window.Blob );
if ( !isFileInput && !canUseFormData ) {
throw new Error( 'Unsupported argument type passed to mw.Api.upload' );
}
if ( canUseFormData ) {
return this.uploadWithFormData( file, data );
}
return this.uploadWithIframe( file, data );
},
/**
* Upload a file to MediaWiki with an iframe and a form.
*
* This method is necessary for browsers without the File/FormData
* APIs, and continues to work in browsers with those APIs.
*
* The rough sketch of how this method works is as follows:
* 1. An iframe is loaded with no content.
* 2. A form is submitted with the passed-in file input and some extras.
* 3. The MediaWiki API receives that form data, and sends back a response.
* 4. The response is sent to the iframe, because we set target=(iframe id)
* 5. The response is parsed out of the iframe's document, and passed back
* through the promise.
*
* @private
* @param {HTMLInputElement} file The file input with a file in it.
* @param {Object} data Other upload options, see action=upload API docs for more
* @return {jQuery.Promise}
*/
uploadWithIframe: function ( file, data ) {
var key,
tokenPromise = $.Deferred(),
api = this,
deferred = $.Deferred(),
nonce = getNonce(),
id = 'uploadframe-' + nonce,
$form = $( '<form>' ),
iframe = getNewIframe( id ),
$iframe = $( iframe );
for ( key in data ) {
if ( !fieldsAllowed[ key ] ) {
delete data[ key ];
}
}
data = $.extend( {}, this.defaults.parameters, { action: 'upload' }, data );
$form.addClass( 'mw-api-upload-form' );
$form.css( 'display', 'none' )
.attr( {
action: this.defaults.ajax.url,
method: 'POST',
target: id,
enctype: 'multipart/form-data'
} );
$iframe.one( 'load', function () {
$iframe.one( 'load', function () {
var result = processIframeResult( iframe );
deferred.notify( 1 );
if ( !result ) {
deferred.reject( 'ok-but-empty', 'No response from API on upload attempt.' );
} else if ( result.error ) {
if ( result.error.code === 'badtoken' ) {
api.badToken( 'csrf' );
}
deferred.reject( result.error.code, result );
} else if ( result.upload && result.upload.warnings ) {
deferred.reject( getFirstKey( result.upload.warnings ), result );
} else {
deferred.resolve( result );
}
} );
tokenPromise.done( function () {
$form.submit();
} );
} );
$iframe.on( 'error', function ( error ) {
deferred.reject( 'http', error );
} );
$iframe.prop( 'src', 'about:blank' ).hide();
file.name = 'file';
$.each( data, function ( key, val ) {
$form.append( getHiddenInput( key, val ) );
} );
if ( !data.filename && !data.stash ) {
throw new Error( 'Filename not included in file data.' );
}
if ( this.needToken() ) {
this.getEditToken().then( function ( token ) {
$form.append( getHiddenInput( 'token', token ) );
tokenPromise.resolve();
}, tokenPromise.reject );
} else {
tokenPromise.resolve();
}
$( 'body' ).append( $form, $iframe );
deferred.always( function () {
$form.remove();
$iframe.remove();
} );
return deferred.promise();
},
/**
* Uploads a file using the FormData API.
*
* @private
* @param {File} file
* @param {Object} data Other upload options, see action=upload API docs for more
* @return {jQuery.Promise}
*/
uploadWithFormData: function ( file, data ) {
var key,
deferred = $.Deferred();
for ( key in data ) {
if ( !fieldsAllowed[ key ] ) {
delete data[ key ];
}
}
data = $.extend( {}, this.defaults.parameters, { action: 'upload' }, data );
data.file = file;
if ( !data.filename && !data.stash ) {
throw new Error( 'Filename not included in file data.' );
}
// Use this.postWithEditToken() or this.post()
this[ this.needToken() ? 'postWithEditToken' : 'post' ]( data, {
// Use FormData (if we got here, we know that it's available)
contentType: 'multipart/form-data',
// Provide upload progress notifications
xhr: function () {
var xhr = $.ajaxSettings.xhr();
if ( xhr.upload ) {
// need to bind this event before we open the connection (see note at
// https://developer.mozilla.org/en-US/docs/DOM/XMLHttpRequest/Using_XMLHttpRequest#Monitoring_progress)
xhr.upload.addEventListener( 'progress', function ( ev ) {
if ( ev.lengthComputable ) {
deferred.notify( ev.loaded / ev.total );
}
} );
}
return xhr;
}
} )
.done( function ( result ) {
deferred.notify( 1 );
if ( result.upload && result.upload.warnings ) {
deferred.reject( getFirstKey( result.upload.warnings ), result );
} else {
deferred.resolve( result );
}
} )
.fail( function ( errorCode, result ) {
deferred.notify( 1 );
deferred.reject( errorCode, result );
} );
return deferred.promise();
},
/**
* Upload a file to the stash.
*
* This function will return a promise, which when resolved, will pass back a function
* to finish the stash upload. You can call that function with an argument containing
* more, or conflicting, data to pass to the server. For example:
*
* // upload a file to the stash with a placeholder filename
* api.uploadToStash( file, { filename: 'testing.png' } ).done( function ( finish ) {
* // finish is now the function we can use to finalize the upload
* // pass it a new filename from user input to override the initial value
* finish( { filename: getFilenameFromUser() } ).done( function ( data ) {
* // the upload is complete, data holds the API response
* } );
* } );
*
* @param {File|HTMLInputElement} file
* @param {Object} [data]
* @return {jQuery.Promise}
* @return {Function} return.finishStashUpload Call this function to finish the upload.
* @return {Object} return.finishStashUpload.data Additional data for the upload.
* @return {jQuery.Promise} return.finishStashUpload.return API promise for the final upload
* @return {Object} return.finishStashUpload.return.data API return value for the final upload
*/
uploadToStash: function ( file, data ) {
var filekey,
api = this;
if ( !data.filename ) {
throw new Error( 'Filename not included in file data.' );
}
function finishUpload( moreData ) {
return api.uploadFromStash( filekey, $.extend( data, moreData ) );
}
return this.upload( file, { stash: true, filename: data.filename } ).then(
function ( result ) {
filekey = result.upload.filekey;
return finishUpload;
},
function ( errorCode, result ) {
if ( result && result.upload && result.upload.filekey ) {
// Ignore any warnings if 'filekey' was returned, that's all we care about
filekey = result.upload.filekey;
return $.Deferred().resolve( finishUpload );
}
return $.Deferred().reject( errorCode, result );
}
);
},
/**
* Finish an upload in the stash.
*
* @param {string} filekey
* @param {Object} data
*/
uploadFromStash: function ( filekey, data ) {
data.filekey = filekey;
data.action = 'upload';
data.format = 'json';
if ( !data.filename ) {
throw new Error( 'Filename not included in file data.' );
}
return this.postWithEditToken( data ).then( function ( result ) {
if ( result.upload && result.upload.warnings ) {
return $.Deferred().reject( getFirstKey( result.upload.warnings ), result ).promise();
}
return result;
} );
},
needToken: function () {
return true;
}
} );
/**
* @class mw.Api
* @mixins mw.Api.plugin.upload
*/
}( mediaWiki, jQuery ) );