resources/src/mediawiki.special/mediawiki.special.upload.js

   1 /**
   2  * JavaScript for Special:Upload
   3  *
   4  * Note that additional code still lives in skins/common/upload.js
   5  *
   6  * @private
   7  * @class mw.special.upload
   8  * @singleton
   9  */
  10 ( function ( mw, $ ) {
  11         // Add a preview to the upload form
  12         $( function () {
  13                 /**
  14                  * Is the FileAPI available with sufficient functionality?
  15                  */
  16                 function hasFileAPI() {
  17                         return window.FileReader !== undefined;
  18                 }
  19
  20                 /**
  21                  * Check if this is a recognizable image type...
  22                  * Also excludes files over 10M to avoid going insane on memory usage.
  23                  *
  24                  * TODO: Is there a way we can ask the browser what's supported in `<img>`s?
  25                  *
  26                  * TODO: Put SVG back after working around Firefox 7 bug <https://bugzilla.wikimedia.org/show_bug.cgi?id=31643>
  27                  *
  28                  * @param {File} file
  29                  * @return boolean
  30                  */
  31                 function fileIsPreviewable( file ) {
  32                         var known = ['image/png', 'image/gif', 'image/jpeg', 'image/svg+xml'],
  33                                 tooHuge = 10 * 1024 * 1024;
  34                         return ( $.inArray( file.type, known ) !== -1 ) && file.size > 0 && file.size < tooHuge;
  35                 }
  36
  37                 /**
  38                  * Show a thumbnail preview of PNG, JPEG, GIF, and SVG files prior to upload
  39                  * in browsers supporting HTML5 FileAPI.
  40                  *
  41                  * As of this writing, known good:
  42                  *
  43                  * - Firefox 3.6+
  44                  * - Chrome 7.something
  45                  *
  46                  * TODO: Check file size limits and warn of likely failures
  47                  *
  48                  * @param {File} file
  49                  */
  50                 function showPreview( file ) {
  51                         var $canvas,
  52                                 ctx,
  53                                 meta,
  54                                 previewSize = 180,
  55                                 thumb = $( '<div id="mw-upload-thumbnail" class="thumb tright">' +
  56                                                         '<div class="thumbinner">' +
  57                                                                 '<div class="mw-small-spinner" style="width: 180px; height: 180px"></div>' +
  58                                                                 '<div class="thumbcaption"><div class="filename"></div><div class="fileinfo"></div></div>' +
  59                                                         '</div>' +
  60                                                 '</div>' );
  61
  62                         thumb.find( '.filename' ).text( file.name ).end()
  63                                 .find( '.fileinfo' ).text( prettySize( file.size ) ).end();
  64
  65                         $canvas = $( '<canvas width="' + previewSize + '" height="' + previewSize + '" ></canvas>' );
  66                         ctx = $canvas[0].getContext( '2d' );
  67                         $( '#mw-htmlform-source' ).parent().prepend( thumb );
  68
  69                         fetchPreview( file, function ( dataURL ) {
  70                                 var img = new Image(),
  71                                         rotation = 0;
  72
  73                                 if ( meta && meta.tiff && meta.tiff.Orientation ) {
  74                                         rotation = ( 360 - ( function () {
  75                                                 // See includes/media/Bitmap.php
  76                                                 switch ( meta.tiff.Orientation.value ) {
  77                                                         case 8:
  78                                                                 return 90;
  79                                                         case 3:
  80                                                                 return 180;
  81                                                         case 6:
  82                                                                 return 270;
  83                                                         default:
  84                                                                 return 0;
  85                                                 }
  86                                         }() ) ) % 360;
  87                                 }
  88
  89                                 img.onload = function () {
  90                                         var info, width, height, x, y, dx, dy, logicalWidth, logicalHeight;
  91
  92                                         // Fit the image within the previewSizexpreviewSize box
  93                                         if ( img.width > img.height ) {
  94                                                 width = previewSize;
  95                                                 height = img.height / img.width * previewSize;
  96                                         } else {
  97                                                 height = previewSize;
  98                                                 width = img.width / img.height * previewSize;
  99                                         }
 100                                         // Determine the offset required to center the image
 101                                         dx = ( 180 - width ) / 2;
 102                                         dy = ( 180 - height ) / 2;
 103                                         switch ( rotation ) {
 104                                                 // If a rotation is applied, the direction of the axis
 105                                                 // changes as well. You can derive the values below by
 106                                                 // drawing on paper an axis system, rotate it and see
 107                                                 // where the positive axis direction is
 108                                                 case 0:
 109                                                         x = dx;
 110                                                         y = dy;
 111                                                         logicalWidth = img.width;
 112                                                         logicalHeight = img.height;
 113                                                         break;
 114                                                 case 90:
 115
 116                                                         x = dx;
 117                                                         y = dy - previewSize;
 118                                                         logicalWidth = img.height;
 119                                                         logicalHeight = img.width;
 120                                                         break;
 121                                                 case 180:
 122                                                         x = dx - previewSize;
 123                                                         y = dy - previewSize;
 124                                                         logicalWidth = img.width;
 125                                                         logicalHeight = img.height;
 126                                                         break;
 127                                                 case 270:
 128                                                         x = dx - previewSize;
 129                                                         y = dy;
 130                                                         logicalWidth = img.height;
 131                                                         logicalHeight = img.width;
 132                                                         break;
 133                                         }
 134
 135                                         ctx.clearRect( 0, 0, 180, 180 );
 136                                         ctx.rotate( rotation / 180 * Math.PI );
 137                                         ctx.drawImage( img, x, y, width, height );
 138                                         thumb.find( '.mw-small-spinner' ).replaceWith( $canvas );
 139
 140                                         // Image size
 141                                         info = mw.msg( 'widthheight', logicalWidth, logicalHeight ) +
 142                                                 ', ' + prettySize( file.size );
 143
 144                                         $( '#mw-upload-thumbnail .fileinfo' ).text( info );
 145                                 };
 146                                 img.src = dataURL;
 147                         }, mw.config.get( 'wgFileCanRotate' ) ? function ( data ) {
 148                                 /*jshint camelcase:false, nomen:false */
 149                                 try {
 150                                         meta = mw.libs.jpegmeta( data, file.fileName );
 151                                         meta._binary_data = null;
 152                                 } catch ( e ) {
 153                                         meta = null;
 154                                 }
 155                         } : null );
 156                 }
 157
 158                 /**
 159                  * Start loading a file into memory; when complete, pass it as a
 160                  * data URL to the callback function. If the callbackBinary is set it will
 161                  * first be read as binary and afterwards as data URL. Useful if you want
 162                  * to do preprocessing on the binary data first.
 163                  *
 164                  * @param {File} file
 165                  * @param {Function} callback
 166                  * @param {Function} callbackBinary
 167                  */
 168                 function fetchPreview( file, callback, callbackBinary ) {
 169                         var reader = new FileReader();
 170                         if ( callbackBinary && 'readAsBinaryString' in reader ) {
 171                                 // To fetch JPEG metadata we need a binary string; start there.
 172                                 // todo:
 173                                 reader.onload = function () {
 174                                         callbackBinary( reader.result );
 175
 176                                         // Now run back through the regular code path.
 177                                         fetchPreview( file, callback );
 178                                 };
 179                                 reader.readAsBinaryString( file );
 180                         } else if ( callbackBinary && 'readAsArrayBuffer' in reader ) {
 181                                 // readAsArrayBuffer replaces readAsBinaryString
 182                                 // However, our JPEG metadata library wants a string.
 183                                 // So, this is going to be an ugly conversion.
 184                                 reader.onload = function () {
 185                                         var i,
 186                                                 buffer = new Uint8Array( reader.result ),
 187                                                 string = '';
 188                                         for ( i = 0; i < buffer.byteLength; i++ ) {
 189                                                 string += String.fromCharCode( buffer[i] );
 190                                         }
 191                                         callbackBinary( string );
 192
 193                                         // Now run back through the regular code path.
 194                                         fetchPreview( file, callback );
 195                                 };
 196                                 reader.readAsArrayBuffer( file );
 197                         } else if ( 'URL' in window && 'createObjectURL' in window.URL ) {
 198                                 // Supported in Firefox 4.0 and above <https://developer.mozilla.org/en/DOM/window.URL.createObjectURL>
 199                                 // WebKit has it in a namespace for now but that's ok. ;)
 200                                 //
 201                                 // Lifetime of this URL is until document close, which is fine
 202                                 // for Special:Upload -- if this code gets used on longer-running
 203                                 // pages, add a revokeObjectURL() when it's no longer needed.
 204                                 //
 205                                 // Prefer this over readAsDataURL for Firefox 7 due to bug reading
 206                                 // some SVG files from data URIs <https://bugzilla.mozilla.org/show_bug.cgi?id=694165>
 207                                 callback( window.URL.createObjectURL( file ) );
 208                         } else {
 209                                 // This ends up decoding the file to base-64 and back again, which
 210                                 // feels horribly inefficient.
 211                                 reader.onload = function () {
 212                                         callback( reader.result );
 213                                 };
 214                                 reader.readAsDataURL( file );
 215                         }
 216                 }
 217
 218                 /**
 219                  * Format a file size attractively.
 220                  *
 221                  * TODO: Match numeric formatting
 222                  *
 223                  * @param {number} s
 224                  * @return {string}
 225                  */
 226                 function prettySize( s ) {
 227                         var sizeMsgs = ['size-bytes', 'size-kilobytes', 'size-megabytes', 'size-gigabytes'];
 228                         while ( s >= 1024 && sizeMsgs.length > 1 ) {
 229                                 s /= 1024;
 230                                 sizeMsgs = sizeMsgs.slice( 1 );
 231                         }
 232                         return mw.msg( sizeMsgs[0], Math.round( s ) );
 233                 }
 234
 235                 /**
 236                  * Clear the file upload preview area.
 237                  */
 238                 function clearPreview() {
 239                         $( '#mw-upload-thumbnail' ).remove();
 240                 }
 241
 242                 /**
 243                  * Check if the file does not exceed the maximum size
 244                  */
 245                 function checkMaxUploadSize( file ) {
 246                         var maxSize, $error;
 247
 248                         function getMaxUploadSize( type ) {
 249                                 var sizes = mw.config.get( 'wgMaxUploadSize' );
 250
 251                                 if ( sizes[type] !== undefined ) {
 252                                         return sizes[type];
 253                                 }
 254                                 return sizes['*'];
 255                         }
 256
 257                         $( '.mw-upload-source-error' ).remove();
 258
 259                         maxSize = getMaxUploadSize( 'file' );
 260                         if ( file.size > maxSize ) {
 261                                 $error = $( '<p class="error mw-upload-source-error" id="wpSourceTypeFile-error">' +
 262                                         mw.message( 'largefileserver', file.size, maxSize ).escaped() + '</p>' );
 263
 264                                 $( '#wpUploadFile' ).after( $error );
 265
 266                                 return false;
 267                         }
 268
 269                         return true;
 270                 }
 271
 272                 /* Initialization */
 273                 if ( hasFileAPI() ) {
 274                         // Update thumbnail when the file selection control is updated.
 275                         $( '#wpUploadFile' ).change( function () {
 276                                 clearPreview();
 277                                 if ( this.files && this.files.length ) {
 278                                         // Note: would need to be updated to handle multiple files.
 279                                         var file = this.files[0];
 280
 281                                         if ( !checkMaxUploadSize( file ) ) {
 282                                                 return;
 283                                         }
 284
 285                                         if ( fileIsPreviewable( file ) ) {
 286                                                 showPreview( file );
 287                                         }
 288                                 }
 289                         } );
 290                 }
 291         } );
 292
 293         // Disable all upload source fields except the selected one
 294         $( function () {
 295                 var i, $row,
 296                         $rows = $( '.mw-htmlform-field-UploadSourceField' );
 297
 298                 /**
 299                  * @param {jQuery} $currentRow
 300                  * @return {Function} Handler
 301                  * @return {jQuery.Event} return.e
 302                  */
 303                 function createHandler( $currentRow ) {
 304                         return function () {
 305                                 $( '.mw-upload-source-error' ).remove();
 306                                 if ( this.checked ) {
 307                                         // Disable all inputs
 308                                         $rows.find( 'input[name!="wpSourceType"]' ).prop( 'disabled', true );
 309                                         // Re-enable the current one
 310                                         $currentRow.find( 'input' ).prop( 'disabled', false );
 311                                 }
 312                         };
 313                 }
 314
 315                 for ( i = $rows.length; i; i-- ) {
 316                         $row = $rows.eq( i - 1 );
 317                         $row
 318                                 .find( 'input[name="wpSourceType"]' )
 319                                 .change( createHandler( $row ) );
 320                 }
 321         } );
 322
 323 }( mediaWiki, jQuery ) );