- JS: added EmailAuthProvider interface

    - .credential(email, password);

- Android/JS: Added auth().link(credential);

TODO other providers.

@chrisbianca - ios needs doing if you need this / have time =]
@Ehesp needs testing

Author: Salakar

android/src/main/java/io/fullstack/firestack/auth/FirestackAuth.java

@@ -29,6 +29,8 @@
 import com.google.firebase.auth.FirebaseUser;
 import com.google.firebase.auth.GetTokenResult;
 import com.google.firebase.auth.GoogleAuthProvider;
+import com.google.firebase.auth.EmailAuthProvider;
+
 
 import io.fullstack.firestack.Utils;
 
@@ -51,7 +53,7 @@ public FirestackAuth(ReactApplicationContext reactContext) {
     mReactContext = reactContext;
     mAuth = FirebaseAuth.getInstance();
 
-   Log.d(TAG, "New FirestackAuth instance");
+    Log.d(TAG, "New FirestackAuth instance");
   }
 
   @Override
@@ -166,6 +168,43 @@ public void signInWithProvider(final String provider, final String authToken, fi
       Utils.todoNote(TAG, "signInWithProvider", callback);
   }
 
+  @ReactMethod
+  public void linkPassword(final String email, final String password, final Callback callback) {
+    FirebaseUser user = mAuth.getCurrentUser();
+
+    if (user != null) {
+      AuthCredential credential = EmailAuthProvider.getCredential(email, password);
+      user
+          .linkWithCredential(credential)
+          .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
+            @Override
+            public void onComplete(@NonNull Task<AuthResult> task) {
+              try {
+                if (task.isSuccessful()) {
+                  Log.d(TAG, "user linked with password credential");
+                  userCallback(mAuth.getCurrentUser(), callback);
+                } else {
+                  userErrorCallback(task, callback);
+                }
+              } catch (Exception ex) {
+                userExceptionCallback(ex, callback);
+              }
+            }
+          });
+    } else {
+      callbackNoUser(callback, true);
+    }
+  }
+
+  @ReactMethod
+  public void link(final String provider, final String authToken, final String authSecret, final Callback callback) {
+    if (provider.equals("password")) {
+      linkPassword(authToken, authSecret, callback);
+    } else
+      // TODO other providers
+      Utils.todoNote(TAG, "linkWithProvider", callback);
+  }
+
   @ReactMethod
   public void signInAnonymously(final Callback callback) {
     Log.d(TAG, "signInAnonymously:called:");
@@ -514,7 +553,7 @@ public void onComplete(@NonNull Task<GetTokenResult> task) {
 
   private void userErrorCallback(Task task, final Callback onFail) {
     WritableMap error = Arguments.createMap();
-    error.putString("code", ((FirebaseAuthException)task.getException()).getErrorCode());
+    error.putString("code", ((FirebaseAuthException) task.getException()).getErrorCode());
     error.putString("message", task.getException().getMessage());
     onFail.invoke(error);
   }

lib/modules/auth/Email.js

@@ -0,0 +1,9 @@
+export default {
+  credential(email, password) {
+    return {
+      token: email,
+      secret: password,
+      provider: 'password',
+    };
+  },
+};

lib/modules/auth.js renamed to lib/modules/auth/index.js

@@ -1,9 +1,10 @@
 // @flow
 import { NativeModules, NativeEventEmitter } from 'react-native';
 
-import User from './user';
-import { Base } from './base';
-import { promisify, toWebSDKErrorCode } from '../utils';
+import User from './../user';
+import { Base } from './../base';
+import EmailAuthProvider from './Email';
+import { promisify } from './../../utils';
 
 const FirestackAuth = NativeModules.FirestackAuth;
 const FirestackAuthEvt = new NativeEventEmitter(FirestackAuth);
@@ -22,6 +23,9 @@ export default class Auth extends Base {
     this._authResult = null;
     this.authenticated = false;
 
+    // attach auth providers
+    // TODO add missing providers
+    this.EmailAuthProvider = EmailAuthProvider;
     // start listening straight away
     // generally though the initial event fired will get ignored
     // but this is ok as we fake it with the getCurrentUser below
@@ -125,6 +129,14 @@ export default class Auth extends Base {
     return promisify('updateUserProfile', FirestackAuth, 'auth/')(updates);
   }
 
+  /**
+   *
+   * @param credential
+   */
+  link(credential: CredentialType) {
+    return promisify('link', FirestackAuth, 'auth/')(credential.provider, credential.token, credential.secret);
+  }
+
   /**
    * Sign the user in with a custom auth token
    * @param  {string} customToken  A self-signed custom auth token.