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misterwilliam
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Updated firebase-event-proxy sample code to latest Firebase SDK (GoogleCloudPlatform#244)
* Updating firebase-event-proxy/pom.xml so that it is more like other pom's and references the parent pom.xml. Adding firebase-event-proxy to parent pom.xml * Fixing checkstyle issues * Update firebase-event-proxy sample code to use latest Firebase SDK * Linting
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Lines changed: 32 additions & 62 deletions

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‎appengine/firebase-event-proxy/gae-firebase-event-proxy/pom.xml‎

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@@ -55,19 +55,19 @@
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<version>1.2</version>
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</dependency>
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<dependency>
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<groupId>com.firebase</groupId>
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<artifactId>firebase-client-jvm</artifactId>
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<version>[1.0.8,)</version>
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<groupId>com.google.firebase</groupId>
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<artifactId>firebase-server-sdk</artifactId>
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<version>[3.0.0,)</version>
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</dependency>
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-core</artifactId>
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<version>2.7.3</version>
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</dependency>
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<dependency>
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<groupId>com.firebase</groupId>
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<artifactId>firebase-token-generator</artifactId>
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<version>2.0.0</version>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-databind</artifactId>
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<version>2.5.3</version>
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</dependency>
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<!-- Test Dependencies -->

‎appengine/firebase-event-proxy/gae-firebase-event-proxy/src/main/java/com/example/GaeFirebaseEventProxy/FirebaseEventProxy.java‎

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@@ -18,52 +18,49 @@
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import com.fasterxml.jackson.core.JsonProcessingException;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.firebase.client.AuthData;
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import com.firebase.client.DataSnapshot;
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import com.firebase.client.Firebase;
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import com.firebase.client.FirebaseError;
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import com.firebase.client.ValueEventListener;
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import com.firebase.security.token.TokenGenerator;
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import com.google.appengine.api.utils.SystemProperty;
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import com.google.firebase.FirebaseApp;
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import com.google.firebase.FirebaseOptions;
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import com.google.firebase.database.DataSnapshot;
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import com.google.firebase.database.DatabaseError;
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import com.google.firebase.database.DatabaseReference;
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import com.google.firebase.database.FirebaseDatabase;
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import com.google.firebase.database.ValueEventListener;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.net.HttpURLConnection;
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import java.net.URL;
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import java.net.URLEncoder;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.Properties;
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import java.util.logging.Logger;
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public class FirebaseEventProxy {
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private static final Logger log = Logger.getLogger(FirebaseEventProxy.class.getName());
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private String firebaseAuthToken;
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public FirebaseEventProxy() {
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// Store Firebase authentication token as an instance variable.
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this.firebaseAuthToken = this.getFirebaseAuthToken(this.getFirebaseSecret());
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String firebaseLocation = "https://crackling-torch-392.firebaseio.com";
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Map<String, Object> databaseAuthVariableOverride = new HashMap<String, Object>();
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// uid and provider will have to match what you have in your firebase security rules
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databaseAuthVariableOverride.put("uid", "gae-firebase-event-proxy");
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databaseAuthVariableOverride.put("provider", "com.example");
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try {
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FirebaseOptions options = new FirebaseOptions.Builder()
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.setServiceAccount(new FileInputStream("gae-firebase-secrets.json"))
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.setDatabaseUrl(firebaseLocation)
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.setDatabaseAuthVariableOverride(databaseAuthVariableOverride).build();
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FirebaseApp.initializeApp(options);
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} catch (IOException e) {
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throw new RuntimeException(
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"Error reading firebase secrets from file: src/main/webapp/gae-firebase-secrets.json: "
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+ e.getMessage());
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}
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}
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public void start() {
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String firebaseLocation = "https://gae-fb-proxy.firebaseio.com/";
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Firebase firebase = new Firebase(firebaseLocation);
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// Authenticate with Firebase
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firebase.authWithCustomToken(this.firebaseAuthToken, new Firebase.AuthResultHandler() {
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@Override
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public void onAuthenticationError(FirebaseError error) {
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log.severe("Firebase login error: " + error.getMessage());
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}
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@Override
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public void onAuthenticated(AuthData auth) {
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log.info("Firebase login successful");
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}
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});
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DatabaseReference firebase = FirebaseDatabase.getInstance().getReference();
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// Subscribe to value events. Depending on use case, you may want to subscribe to child events
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// through childEventListener.
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if (snapshot.exists()) {
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try {
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// Convert value to JSON using Jackson
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String json = new ObjectMapper().writeValueAsString(snapshot.getValue());
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String json = new ObjectMapper().writeValueAsString(snapshot.getValue(false));
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// Replace the URL with the url of your own listener app.
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URL dest = new URL("http://gae-firebase-listener-python.appspot.com/log");
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}
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@Override
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public void onCancelled(FirebaseError error) {
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public void onCancelled(DatabaseError error) {
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log.severe("Firebase connection cancelled: " + error.getMessage());
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}
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});
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}
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private String getFirebaseSecret() {
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Properties props = new Properties();
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try {
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// Read from src/main/webapp/firebase-secrets.properties
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InputStream inputStream = new FileInputStream("firebase-secret.properties");
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props.load(inputStream);
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return props.getProperty("firebaseSecret");
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} catch (java.net.MalformedURLException e) {
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throw new RuntimeException(
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"Error reading firebase secrets from file: src/main/webapp/firebase-sercrets.properties: "
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+ e.getMessage());
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} catch (IOException e) {
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throw new RuntimeException(
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"Error reading firebase secrets from file: src/main/webapp/firebase-sercrets.properties: "
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+ e.getMessage());
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}
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}
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private String getFirebaseAuthToken(String firebaseSecret) {
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Map<String, Object> authPayload = new HashMap<String, Object>();
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// uid and provider will have to match what you have in your firebase security rules
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authPayload.put("uid", "gae-firebase-event-proxy");
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authPayload.put("provider", "com.example");
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TokenGenerator tokenGenerator = new TokenGenerator(firebaseSecret);
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return tokenGenerator.createToken(authPayload);
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}
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}

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