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

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