FirefoxOS, getting a certificate for an app.

get_certificate_fragment.js

  getCertificate: function getCertificate(aManifestURL) {
    let manifestURL = "app://system.gaiamobile.org/manifest.webapp"; // change.
    Cu.import("resource://gre/modules/FileUtils.jsm");
    Cu.import("resource://gre/modules/NetUtil.jsm");

    XPCOMUtils.defineLazyServiceGetter(this, "appsService",
                                       "@mozilla.org/AppsService;1",
                                       "nsIAppsService");
    let app = appsService.getAppByManifestURL(manifestURL);
    if (!app) {
      debug("ZZZ: Missing app");
      return false;
    }
    
    let appDir = null;
    // Pre-installed apps (if Non-engr builds):
    appDir = FileUtils.getDir("coreAppsDir", ["webapps", app.id], false, true);
    if (!appDir.exists()) {
      // Privilaged apps:
      appDir = FileUtils.getDir("webappsDir", ["webapps", app.id], false, true);
    }
    // Since the app is supposed to be installed, this might work:
    // appDir = FileUtils.initWithPath(app.basePath);
    // appDir.append(app.id);
    let appPackage = appDir.clone();
    appPackage.append("application.zip");
    if (appPackage.exists()) {
      debug("ZZZ: object good.");
    } else {
      debug("ZZZ: object bad.");
    }
     
    let zipReader = Cc["@mozilla.org/libjar/zip-reader;1"]
      .createInstance(Ci.nsIZipReader);
     
    zipReader.open(appPackage);
    debug('has file: ' + zipReader.hasEntry("dev_cert.cer"));
     
    let devCertStream = zipReader.getInputStream("dev_cert.cer");
    let devCert = NetUtil.readInputStreamToString(devCertStream, devCertStream.available());
    devCertStream.close();
    debug("Dev cert: " + devCert);
  }