Added getSigningCertificateFingerprint

Author: EddyVerbruggen

Diff for: README.md

@@ -274,6 +274,7 @@ As stated before, this plugin is all about user authentication and identity, so
 - A: Make sure you are using a Virtual Device running with a **Google APIs target and/or a Google APIs CPU**!
 
 ## 10. Changelog
+- 5.0.3: Added the convenience method `getSigningCertificateFingerprint` to retrieve the Android cert fingerprint which is required in the Google Developer Console.
 - 5.0.2: Require linking against `SafariServices` and `CoreText` frameworks on iOS as per Google's recommendation. Added `loginHint` on iOS.
 - 5.0.0: Android GoogleSignIn SDK (See #193), iOS SDK 4.0.0, iOS compatibility with Facebook authentication plugins, added `familyName` and `givenName`.
 - 4.0.8: Fix for Android 6 where it would crash while asking for permission. Thx #166!

Diff for: demo/index.html

@@ -29,6 +29,7 @@ <h1>Google+</h1>
     &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
     <button onclick="disconnect()">Disconnect</button>
     <br/><br/>
+    <button onclick="window.plugins.googleplus.getSigningCertificateFingerprint(function(res){alert(res)}, function(res){alert(res)})">get cert fingerprint (Android)</button>
   </div>
 </div>
 <script type="text/javascript" src="cordova.js"></script>

Diff for: package.json

@@ -1,5 +1,5 @@
 {
-  "version": "5.0.2",
+  "version": "5.0.3",
   "name": "cordova-plugin-googleplus",
   "cordova_name": "Google SignIn",
   "description": "Use your Google account to authenticate with the app.",

Diff for: plugin.xml

@@ -2,7 +2,7 @@
 <plugin xmlns="http://apache.org/cordova/ns/plugins/1.0"
         xmlns:android="http://schemas.android.com/apk/res/android"
         id="cordova-plugin-googleplus"
-        version="5.0.2">
+        version="5.0.3">
 
   <name>Google SignIn</name>
 

Diff for: src/android/GooglePlus.java

@@ -1,6 +1,8 @@
 package nl.xservices.plugins;
 
 import android.content.Intent;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
 import android.util.Log;
 
 import com.google.android.gms.auth.api.Auth;
@@ -17,6 +19,9 @@
 import org.json.JSONException;
 import org.json.JSONObject;
 
+import java.security.MessageDigest;
+import android.content.pm.Signature;
+
 /**
  * Originally written by Eddy Verbruggen (http://github.com/EddyVerbruggen/cordova-plugin-googleplus)
  * Forked/Duplicated and Modified by PointSource, LLC, 2016.
@@ -28,6 +33,7 @@ public class GooglePlus extends CordovaPlugin implements GoogleApiClient.OnConne
     public static final String ACTION_TRY_SILENT_LOGIN = "trySilentLogin";
     public static final String ACTION_LOGOUT = "logout";
     public static final String ACTION_DISCONNECT = "disconnect";
+    public static final String ACTION_GET_SIGNING_CERTIFICATE_FINGERPRINT = "getSigningCertificateFingerprint";
 
     //String options/config object names passed in to login and trySilentLogin
     public static final String ARGUMENT_WEB_CLIENT_ID = "webClientId";
@@ -50,22 +56,23 @@ public void initialize(CordovaInterface cordova, CordovaWebView webView) {
     public boolean execute(String action, CordovaArgs args, CallbackContext callbackContext) throws JSONException {
         this.savedCallbackContext = callbackContext;
 
-        //pass args into api client build
-        buildGoogleApiClient(args.optJSONObject(0));
-
-        Log.i(TAG, "Determining command to execute");
-
         if (ACTION_IS_AVAILABLE.equals(action)) {
             final boolean avail = true;
             savedCallbackContext.success("" + avail);
 
         } else if (ACTION_LOGIN.equals(action)) {
+            //pass args into api client build
+            buildGoogleApiClient(args.optJSONObject(0));
+
             // Tries to Log the user in
             Log.i(TAG, "Trying to Log in!");
             cordova.setActivityResultCallback(this); //sets this class instance to be an activity result listener
             signIn();
 
         } else if (ACTION_TRY_SILENT_LOGIN.equals(action)) {
+            //pass args into api client build
+            buildGoogleApiClient(args.optJSONObject(0));
+
             Log.i(TAG, "Trying to do silent login!");
             trySilentLogin();
 
@@ -77,6 +84,9 @@ public boolean execute(String action, CordovaArgs args, CallbackContext callback
             Log.i(TAG, "Trying to disconnect the user");
             disconnect();
 
+        } else if (ACTION_GET_SIGNING_CERTIFICATE_FINGERPRINT.equals(action)) {
+            getSigningCertificateFingerprint();
+
         } else {
             Log.i(TAG, "This action doesn't exist");
             return false;
@@ -90,20 +100,16 @@ public boolean execute(String action, CordovaArgs args, CallbackContext callback
      * @param clientOptions - the options object passed in the login function
      */
     private synchronized void buildGoogleApiClient(JSONObject clientOptions) throws JSONException {
-        //If options have been passed in, they could be different, so force a rebuild of the client
-        if (clientOptions != null) {
-            // disconnect old client iff it exists
-            if (this.mGoogleApiClient != null) this.mGoogleApiClient.disconnect();
-            // nullify
-            this.mGoogleApiClient = null;
-        }
-
-        //determine the state of the GoogleApiClient
-        if (this.mGoogleApiClient != null) {
-            //don't go any further. client is already built.
+        if (clientOptions == null) {
             return;
         }
 
+        //If options have been passed in, they could be different, so force a rebuild of the client
+        // disconnect old client iff it exists
+        if (this.mGoogleApiClient != null) this.mGoogleApiClient.disconnect();
+        // nullify
+        this.mGoogleApiClient = null;
+
         Log.i(TAG, "Building Google options");
 
         // Make our SignIn Options builder.
@@ -316,4 +322,36 @@ private void handleSignInResult(GoogleSignInResult signInResult) {
             }
         }
     }
+
+    private void getSigningCertificateFingerprint() {
+        String packageName = webView.getContext().getPackageName();
+        int flags = PackageManager.GET_SIGNATURES;
+        PackageManager pm = webView.getContext().getPackageManager();
+        try {
+            PackageInfo packageInfo = pm.getPackageInfo(packageName, flags);
+            Signature[] signatures = packageInfo.signatures;
+            byte[] cert = signatures[0].toByteArray();
+
+            String strResult = "";
+            MessageDigest md;
+            md = MessageDigest.getInstance("SHA1");
+            md.update(cert);
+            for (byte b : md.digest()) {
+                String strAppend = Integer.toString(b & 0xff, 16);
+                if (strAppend.length() == 1) {
+                    strResult += "0";
+                }
+                strResult += strAppend;
+                strResult += ":";
+            }
+            // strip the last ':'
+            strResult = strResult.substring(0, strResult.length()-1);
+            strResult = strResult.toUpperCase();
+            this.savedCallbackContext.success(strResult);
+
+        } catch (Exception e) {
+            e.printStackTrace();
+            savedCallbackContext.error(e.getMessage());
+        }
+    }
 }

Diff for: www/GooglePlus.js

@@ -21,6 +21,10 @@ GooglePlus.prototype.disconnect = function (successCallback, errorCallback) {
   cordova.exec(successCallback, errorCallback, "GooglePlus", "disconnect", []);
 };
 
+GooglePlus.prototype.getSigningCertificateFingerprint = function (successCallback, errorCallback) {
+  cordova.exec(successCallback, errorCallback, "GooglePlus", "getSigningCertificateFingerprint", []);
+};
+
 GooglePlus.install = function () {
   if (!window.plugins) {
     window.plugins = {};