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116 lines
3.5 KiB
116 lines
3.5 KiB
/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
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/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */ |
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/* |
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Copyright 2012 Mozilla Foundation |
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Licensed under the Apache License, Version 2.0 (the "License"); |
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you may not use this file except in compliance with the License. |
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You may obtain a copy of the License at |
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http://www.apache.org/licenses/LICENSE-2.0 |
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Unless required by applicable law or agreed to in writing, software |
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distributed under the License is distributed on an "AS IS" BASIS, |
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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See the License for the specific language governing permissions and |
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limitations under the License. |
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*/ |
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/* globals chrome */ |
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'use strict'; |
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function isPdfDownloadable(details) { |
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return details.url.indexOf('pdfjs.action=download') >= 0; |
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} |
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function insertPDFJSForTab(tabId, url) { |
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chrome.tabs.executeScript(tabId, { |
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file: 'insertviewer.js', |
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allFrames: true, |
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runAt: 'document_start' |
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}, function() { |
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chrome.tabs.sendMessage(tabId, { |
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type: 'showPDFViewer', |
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url: url |
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}); |
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}); |
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} |
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function activatePDFJSForTab(tabId, url) { |
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chrome.tabs.onUpdated.addListener(function listener(_tabId) { |
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if (tabId === _tabId) { |
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insertPDFJSForTab(tabId, url); |
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chrome.tabs.onUpdated.removeListener(listener); |
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} |
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}); |
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} |
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chrome.webRequest.onHeadersReceived.addListener( |
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function(details) { |
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// Check if the response is a PDF file |
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var isPDF = false; |
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var headers = details.responseHeaders; |
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var header, i; |
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var cdHeader; |
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if (!headers) |
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return; |
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for (i=0; i<headers.length; ++i) { |
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header = headers[i]; |
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if (header.name.toLowerCase() == 'content-type') { |
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var headerValue = header.value.toLowerCase().split(';',1)[0].trim(); |
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isPDF = headerValue === 'application/pdf' || |
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headerValue === 'application/octet-stream' && |
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details.url.toLowerCase().indexOf('.pdf') > 0; |
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break; |
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} |
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} |
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if (!isPDF) |
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return; |
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if (isPdfDownloadable(details)) { |
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// Force download by ensuring that Content-Disposition: attachment is set |
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if (!cdHeader) { |
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for (; i<headers.length; ++i) { |
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header = headers[i]; |
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if (header.name.toLowerCase() == 'content-disposition') { |
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cdHeader = header; |
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break; |
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} |
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} |
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} |
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if (!cdHeader) { |
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cdHeader = {name: 'Content-Disposition', value: ''}; |
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headers.push(cdHeader); |
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} |
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if (cdHeader.value.toLowerCase().indexOf('attachment') === -1) { |
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cdHeader.value = 'attachment' + cdHeader.value.replace(/^[^;]+/i, ''); |
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return { |
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responseHeaders: headers |
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}; |
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} |
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return; |
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} |
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// Replace frame's content with the PDF viewer |
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// This approach maintains the friendly URL in the |
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// location bar |
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activatePDFJSForTab(details.tabId, details.url); |
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return { |
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responseHeaders: [ |
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// Set Cache-Control header to avoid downloading a file twice |
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{name:'Cache-Control',value:'max-age=600'}, |
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// Temporary render response as XHTML. |
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// Since PDFs are never valid XHTML, the garbage is not going to be |
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// rendered. insertviewer.js will quickly replace the document with |
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// the PDF.js viewer. |
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{name:'Content-Type',value:'application/xhtml+xml; charset=US-ASCII'}, |
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] |
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}; |
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}, |
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{ |
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urls: [ |
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'<all_urls>' |
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], |
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types: ['main_frame', 'sub_frame'] |
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}, |
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['blocking','responseHeaders']);
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