The Tor Browser / file revision

 var Cc = Components.classes;

 var Ci = Components.interfaces;

 var Cu = Components.utils;

 // From prio.h

 const PR_RDWR        = 0x04;

 const PR_CREATE_FILE = 0x08;

 const PR_TRUNCATE    = 0x20;

 Cu.import("resource://gre/modules/FileUtils.jsm");

 Cu.import("resource://gre/modules/NetUtil.jsm");

 var gBasePath = "tests/dom/apps/tests/";

 var gMiniManifestTemplate = "file_packaged_app.template.webapp";

 var gAppTemplate = "file_packaged_app.template.html";

 var gAppName = "appname";

 var gDevName = "devname";

 var gDevUrl = "http://dev.url";

 function handleRequest(request, response) {

   var query = getQuery(request);

   response.setHeader("Access-Control-Allow-Origin", "*", false);

   var packageSize = ("packageSize" in query) ? query.packageSize : 0;

   var appName = ("appName" in query) ? query.appName : gAppName;

   var devName = ("devName" in query) ? query.devName : gDevName;

   var devUrl = ("devUrl" in query) ? query.devUrl : gDevUrl;

   // If this is a version update, update state, prepare the manifest,

   // the application package and return.

   if ("setVersion" in query) {

     var version = query.setVersion;

     setState("version", version);

     var packageVersion = ("dontUpdatePackage" in query) ? version - 1 : version;

     var packageName = "test_packaged_app_" + packageVersion + ".zip";

     setState("packageName", packageName);

     var packagePath = "/" + gBasePath + "file_packaged_app.sjs?getPackage=" +

                       packageName;

     setState("packagePath", packagePath);

     if (version == packageVersion) {

       // Create the application package.

       var zipWriter = Cc["@mozilla.org/zipwriter;1"]

                         .createInstance(Ci.nsIZipWriter);

       var zipFile = FileUtils.getFile("TmpD", [packageName]);

       zipWriter.open(zipFile, PR_RDWR | PR_CREATE_FILE | PR_TRUNCATE);

       // We want to run some tests without the manifest included in the zip.

       if (version != "0") {

         var manifestTemplate = gBasePath + gMiniManifestTemplate;

         var manifest = makeResource(manifestTemplate, version, packagePath,

                                     packageSize, appName, devName, devUrl);

         addZipEntry(zipWriter, manifest, "manifest.webapp");

       }

       var appTemplate = gBasePath + gAppTemplate;

       var app = makeResource(appTemplate, version, packagePath, packageSize,

                              appName, devName, devUrl);

       addZipEntry(zipWriter, app, "index.html");

       zipWriter.close();

     }

     response.setHeader("Content-Type", "text/html", false);

     response.write("OK");

     return;

   }

   // Get the version from server state

   var version = Number(getState("version"));

   var packageName = String(getState("packageName"));

   var packagePath = String(getState("packagePath"));

   var etag = getEtag(request, version);

   if (etagMatches(request, etag)) {

     dump("Etags Match. Sending 304\n");

     response.setStatusLine(request.httpVersion, "304", "Not modified");

     return;

   }

   response.setHeader("Etag", etag, false);

   // Serve the application package corresponding to the requested app version.

   if ("getPackage" in query) {

     var resource = readFile(packageName, true);

     response.setHeader("Content-Type",

                        "Content-Type: application/java-archive", false);

     response.write(resource);

     return;

   }

   // Serve the mini-manifest corresponding to the requested app version.

   if ("getManifest" in query) {

     var template = gBasePath + gMiniManifestTemplate;

     if (!("noManifestContentType" in query)) {

       response.setHeader("Content-Type",

                          "application/x-web-app-manifest+json", false);

     }

     packagePath = "wrongPackagePath" in query ? "" : packagePath;

     var manifest = makeResource(template, version, packagePath, packageSize,

                                 appName, devName, devUrl);

     response.write(manifest);

     return;

   }

   response.setHeader("Content-type", "text-html", false);

   response.write("KO");

 }

 function getQuery(request) {

   var query = {};

   request.queryString.split('&').forEach(function (val) {

     var [name, value] = val.split('=');

     query[name] = unescape(value);

   });

   return query;

 }

 function getEtag(request, version) {

   return request.queryString.replace(/&/g, '-').replace(/=/g, '-') +

          '-' + version;

 }

 function etagMatches(request, etag) {

   return request.hasHeader("If-None-Match") &&

          request.getHeader("If-None-Match") == etag;

 }

 // File and resources helpers

 function addZipEntry(zipWriter, entry, entryName) {

   var stream = Cc["@mozilla.org/io/string-input-stream;1"]

                .createInstance(Ci.nsIStringInputStream);

   stream.setData(entry, entry.length);

   zipWriter.addEntryStream(entryName, Date.now(),

                            Ci.nsIZipWriter.COMPRESSION_BEST, stream, false);

 }

 function readFile(path, fromTmp) {

   var dir = fromTmp ? "TmpD" : "CurWorkD";

   var file = Cc["@mozilla.org/file/directory_service;1"]

              .getService(Ci.nsIProperties)

              .get(dir, Ci.nsILocalFile);

   var fstream = Cc["@mozilla.org/network/file-input-stream;1"]

                 .createInstance(Ci.nsIFileInputStream);

   var split = path.split("/");

   for(var i = 0; i < split.length; ++i) {

     file.append(split[i]);

   }

   fstream.init(file, -1, 0, 0);

   var data = NetUtil.readInputStreamToString(fstream, fstream.available());

   fstream.close();

   return data;

 }

 function makeResource(templatePath, version, packagePath, packageSize,

                       appName, developerName, developerUrl) {

   var res = readFile(templatePath, false)

             .replace(/VERSIONTOKEN/g, version)

             .replace(/PACKAGEPATHTOKEN/g, packagePath)

             .replace(/PACKAGESIZETOKEN/g, packageSize)

             .replace(/NAMETOKEN/g, appName)

             .replace(/DEVELOPERTOKEN/g, developerName)

             .replace(/DEVELOPERURLTOKEN/g, developerUrl);

   return res;

 }