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plupload.gears.js
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plupload.gears.js
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/**
* plupload.gears.js
*
* Copyright 2009, Moxiecode Systems AB
* Released under GPL License.
*
* License: http://www.plupload.com/license
* Contributing: http://www.plupload.com/contributing
*/
// JSLint defined globals
/*global window:false, document:false, plupload:false, google:false, GearsFactory:false, ActiveXObject:false */
// Copyright 2007, Google Inc.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// 3. Neither the name of Google Inc. nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
// EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Sets up google.gears.*, which is *the only* supported way to access Gears.
//
// Circumvent this file at your own risk!
//
// In the future, Gears may automatically define google.gears.* without this
// file. Gears may use these objects to transparently fix bugs and compatibility
// issues. Applications that use the code below will continue to work seamlessly
// when that happens.
(function() {
// We are already defined. Hooray!
if (window.google && google.gears) {
return;
}
var factory = null;
// Firefox
if (typeof GearsFactory != 'undefined') {
factory = new GearsFactory();
} else {
// IE
try {
factory = new ActiveXObject('Gears.Factory');
// privateSetGlobalObject is only required and supported on WinCE.
if (factory.getBuildInfo().indexOf('ie_mobile') != -1) {
factory.privateSetGlobalObject(this);
}
} catch (e) {
// Safari
if ((typeof navigator.mimeTypes != 'undefined') && navigator.mimeTypes["application/x-googlegears"]) {
factory = document.createElement("object");
factory.style.display = "none";
factory.width = 0;
factory.height = 0;
factory.type = "application/x-googlegears";
document.documentElement.appendChild(factory);
}
}
}
// *Do not* define any objects if Gears is not installed. This mimics the
// behavior of Gears defining the objects in the future.
if (!factory) {
return;
}
// Now set up the objects, being careful not to overwrite anything.
//
// Note: In Internet Explorer for Windows Mobile, you can't add properties to
// the window object. However, global objects are automatically added as
// properties of the window object in all browsers.
if (!window.google) {
window.google = {};
}
if (!google.gears) {
google.gears = {factory: factory};
}
})();
(function(window, document, plupload, undef) {
var blobs = {};
function scaleImage(image_blob, resize, mime) {
var percentage, canvas, context, scale;
// Setup canvas and scale
canvas = google.gears.factory.create('beta.canvas');
try {
canvas.decode(image_blob);
if (!resize['width']) {
resize['width'] = canvas.width;
}
if (!resize['height']) {
resize['height'] = canvas.height;
}
scale = Math.min(width / canvas.width, height / canvas.height);
if (scale < 1 || (scale === 1 && mime === 'image/jpeg')) {
canvas.resize(Math.round(canvas.width * scale), Math.round(canvas.height * scale));
if (resize['quality']) {
return canvas.encode(mime, {quality : resize.quality / 100});
}
return canvas.encode(mime);
}
} catch (e) {
// Ignore for example when a user uploads a file that can't be decoded
}
return image_blob;
}
/**
* Gears implementation. This runtime supports these features: dragdrop, jpgresize, pngresize, chunks.
*
* @static
* @class plupload.runtimes.Gears
* @extends plupload.Runtime
*/
plupload.runtimes.Gears = plupload.addRuntime("gears", {
/**
* Returns a list of supported features for the runtime.
*
* @return {Object} Name/value object with supported features.
*/
getFeatures : function() {
return {
dragdrop: true,
jpgresize: true,
pngresize: true,
chunks: true,
progress: true,
multipart: true,
multi_selection: true
};
},
/**
* Initializes the upload runtime.
*
* @method init
* @param {plupload.Uploader} uploader Uploader instance that needs to be initialized.
* @param {function} callback Callback to execute when the runtime initializes or fails to initialize. If it succeeds an object with a parameter name success will be set to true.
*/
init : function(uploader, callback) {
var desktop, req, disabled = false;
// Check for gears support
if (!window.google || !google.gears) {
return callback({success : false});
}
try {
desktop = google.gears.factory.create('beta.desktop');
} catch (e) {
// Might fail on the latest Gecko build for some odd reason
return callback({success : false});
}
function addSelectedFiles(selected_files) {
var file, i, files = [], id;
// Add the selected files to the file queue
for (i = 0; i < selected_files.length; i++) {
file = selected_files[i];
// Store away gears blob internally
id = plupload.guid();
blobs[id] = file.blob;
files.push(new plupload.File(id, file.name, file.blob.length));
}
// Fire FilesAdded event
uploader.trigger("FilesAdded", files);
}
// Add drop handler
uploader.bind("PostInit", function() {
var settings = uploader.settings, dropElm = document.getElementById(settings.drop_element);
if (dropElm) {
// Block browser default drag over
plupload.addEvent(dropElm, 'dragover', function(e) {
desktop.setDropEffect(e, 'copy');
e.preventDefault();
}, uploader.id);
// Attach drop handler and grab files from Gears
plupload.addEvent(dropElm, 'drop', function(e) {
var dragData = desktop.getDragData(e, 'application/x-gears-files');
if (dragData) {
addSelectedFiles(dragData.files);
}
e.preventDefault();
}, uploader.id);
// Prevent IE leak
dropElm = 0;
}
// Add browse button
plupload.addEvent(document.getElementById(settings.browse_button), 'click', function(e) {
var filters = [], i, a, ext;
e.preventDefault();
if (disabled) {
return;
}
no_type_restriction:
for (i = 0; i < settings.filters.length; i++) {
ext = settings.filters[i].extensions.split(',');
for (a = 0; a < ext.length; a++) {
if (ext[a] === '*') {
filters = [];
break no_type_restriction;
}
filters.push('.' + ext[a]);
}
}
desktop.openFiles(addSelectedFiles, {singleFile : !settings.multi_selection, filter : filters});
}, uploader.id);
});
uploader.bind("CancelUpload", function() {
if (req.abort) {
req.abort();
}
});
uploader.bind("UploadFile", function(up, file) {
var chunk = 0, chunks, chunkSize, loaded = 0, resize = up.settings.resize, chunking;
// If file is png or jpeg and resize is configured then resize it
if (resize && /\.(png|jpg|jpeg)$/i.test(file.name)) {
blobs[file.id] = scaleImage(blobs[file.id], resize, /\.png$/i.test(file.name) ? 'image/png' : 'image/jpeg');
}
file.size = blobs[file.id].length;
chunkSize = up.settings.chunk_size;
chunking = chunkSize > 0;
chunks = Math.ceil(file.size / chunkSize);
// If chunking is disabled then upload the whole file in one huge chunk
if (!chunking) {
chunkSize = file.size;
chunks = 1;
}
function uploadNextChunk() {
var curChunkSize, multipart = up.settings.multipart, multipartLength = 0, reqArgs = {name : file.target_name || file.name}, url = up.settings.url;
// Sends the binary blob multipart encoded or raw depending on config
function sendBinaryBlob(blob) {
var builder, boundary = '----pluploadboundary' + plupload.guid(), dashdash = '--', crlf = '\r\n', multipartBlob, mimeType;
// Build multipart request
if (multipart) {
req.setRequestHeader('Content-Type', 'multipart/form-data; boundary=' + boundary);
builder = google.gears.factory.create('beta.blobbuilder');
// Append mutlipart parameters
plupload.each(plupload.extend(reqArgs, up.settings.multipart_params), function(value, name) {
builder.append(
dashdash + boundary + crlf +
'Content-Disposition: form-data; name="' + name + '"' + crlf + crlf
);
builder.append(value + crlf);
});
mimeType = plupload.mimeTypes[file.name.replace(/^.+\.([^.]+)/, '$1').toLowerCase()] || 'application/octet-stream';
// Add file header
builder.append(
dashdash + boundary + crlf +
'Content-Disposition: form-data; name="' + up.settings.file_data_name + '"; filename="' + file.name + '"' + crlf +
'Content-Type: ' + mimeType + crlf + crlf
);
// Add file data
builder.append(blob);
// Add footer
builder.append(crlf + dashdash + boundary + dashdash + crlf);
multipartBlob = builder.getAsBlob();
multipartLength = multipartBlob.length - blob.length;
blob = multipartBlob;
}
// Send blob or multipart blob depending on config
req.send(blob);
}
// File upload finished
if (file.status == plupload.DONE || file.status == plupload.FAILED || up.state == plupload.STOPPED) {
return;
}
// Only add chunking args if needed
if (chunking) {
reqArgs.chunk = chunk;
reqArgs.chunks = chunks;
}
// Setup current chunk size
curChunkSize = Math.min(chunkSize, file.size - (chunk * chunkSize));
if (!multipart) {
url = plupload.buildUrl(up.settings.url, reqArgs);
}
req = google.gears.factory.create('beta.httprequest');
req.open('POST', url);
// Add disposition and type if multipart is disabled
if (!multipart) {
req.setRequestHeader('Content-Disposition', 'attachment; filename="' + file.name + '"');
req.setRequestHeader('Content-Type', 'application/octet-stream');
}
// Set custom headers
plupload.each(up.settings.headers, function(value, name) {
req.setRequestHeader(name, value);
});
req.upload.onprogress = function(progress) {
file.loaded = loaded + progress.loaded - multipartLength;
up.trigger('UploadProgress', file);
};
req.onreadystatechange = function() {
var chunkArgs;
if (req.readyState == 4 && up.state !== plupload.STOPPED) {
if (req.status == 200) {
chunkArgs = {
chunk : chunk,
chunks : chunks,
response : req.responseText,
status : req.status
};
up.trigger('ChunkUploaded', file, chunkArgs);
// Stop upload
if (chunkArgs.cancelled) {
file.status = plupload.FAILED;
return;
}
loaded += curChunkSize;
if (++chunk >= chunks) {
file.status = plupload.DONE;
up.trigger('FileUploaded', file, {
response : req.responseText,
status : req.status
});
} else {
uploadNextChunk();
}
} else {
up.trigger('Error', {
code : plupload.HTTP_ERROR,
message : plupload.translate('HTTP Error.'),
file : file,
chunk : chunk,
chunks : chunks,
status : req.status
});
}
}
};
if (chunk < chunks) {
sendBinaryBlob(blobs[file.id].slice(chunk * chunkSize, curChunkSize));
}
}
// Start uploading chunks
uploadNextChunk();
});
uploader.bind("DisableBrowse", function(up, state) {
disabled = state;
});
uploader.bind("Destroy", function(up) {
var name, element,
elements = {
browseButton: up.settings.browse_button,
dropElm: up.settings.drop_element
};
// Unbind event handlers
for (name in elements) {
element = document.getElementById(elements[name]);
if (element) {
plupload.removeAllEvents(element, up.id);
}
}
});
callback({success : true});
}
});
})(window, document, plupload);