lgarner · March 6, 2015 23:33 · Mar 6, 2015
diff --git a/get_certificate_fragment.js b/get_certificate_fragment.js
@@ -0,0 +1,43 @@
+  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);
+  }