Automatic google login with username and password

build.gradle

@@ -25,6 +25,7 @@ targetCompatibility = 1.7
 
 repositories {
     mavenCentral()
+    maven { url "https://jitpack.io" }
 }
 
 sourceSets {
@@ -95,6 +96,7 @@ checkstyleMain.doLast {
 }
 
 dependencies {
+    compile 'com.github.svarzee:gpsoauth-java:v0.2.0'
     compile 'com.squareup.okio:okio:1.9.0'
     compile 'com.squareup.moshi:moshi:1.2.0'
     compile 'com.annimon:stream:1.1.1'

src/main/java/com/pokegoapi/auth/GoogleAutoCredentialProvider.java

@@ -0,0 +1,99 @@
+package com.pokegoapi.auth;
+
+import POGOProtos.Networking.Envelopes.RequestEnvelopeOuterClass.RequestEnvelope.AuthInfo;
+import com.pokegoapi.exceptions.LoginFailedException;
+import com.pokegoapi.exceptions.RemoteServerException;
+import okhttp3.OkHttpClient;
+import svarzee.gps.gpsoauth.AuthToken;
+import svarzee.gps.gpsoauth.Gpsoauth;
+
+import java.io.IOException;
+
+/**
+ * Use to login with google username and password
+ */
+public class GoogleAutoCredentialProvider extends CredentialProvider {
+
+	// from https://github.com/tejado/pgoapi/blob/master/pgoapi/auth_google.py
+	private static String GOOGLE_LOGIN_ANDROID_ID = "9774d56d682e549c";
+	private static String GOOGLE_LOGIN_SERVICE =
+			"audience:server:client_id:848232511240-7so421jotr2609rmqakceuu1luuq0ptb.apps.googleusercontent.com";
+	private static String GOOGLE_LOGIN_APP = "com.nianticlabs.pokemongo";
+	private static String GOOGLE_LOGIN_CLIENT_SIG = "321187995bc7cdc2b5fc91b11a96e2baa8602c62";
+
+	private final Gpsoauth gpsoauth;
+	private final String username;
+	private TokenInfo tokenInfo;
+
+
+	/**
+	 * Constructs credential provider using username and password
+	 *
+	 * @param username - google username
+	 * @param password - google password
+	 * @throws LoginFailedException  - login failed possibly due to invalid credentials
+	 * @throws RemoteServerException - some server/network failure
+	 */
+	public GoogleAutoCredentialProvider(OkHttpClient httpClient, String username, String password)
+			throws LoginFailedException, RemoteServerException {
+		this.gpsoauth = new Gpsoauth(httpClient);
+		this.username = username;
+		this.tokenInfo = login(username, password);
+	}
+
+	private TokenInfo login(String username, String password) throws RemoteServerException, LoginFailedException {
+		try {
+			String masterToken = gpsoauth.performMasterLoginForToken(username, password, GOOGLE_LOGIN_ANDROID_ID);
+			AuthToken authToken = gpsoauth.performOAuthForToken(username, masterToken, GOOGLE_LOGIN_ANDROID_ID,
+					GOOGLE_LOGIN_SERVICE, GOOGLE_LOGIN_APP, GOOGLE_LOGIN_CLIENT_SIG);
+			return new TokenInfo(authToken, masterToken);
+		} catch (IOException e) {
+			throw new RemoteServerException(e);
+		} catch (Gpsoauth.TokenRequestFailed e) {
+			throw new LoginFailedException(e);
+		}
+	}
+
+	private TokenInfo refreshToken(String username, String refreshToken) throws RemoteServerException, LoginFailedException {
+		try {
+			AuthToken authToken = gpsoauth.performOAuthForToken(username, refreshToken, GOOGLE_LOGIN_ANDROID_ID,
+					GOOGLE_LOGIN_SERVICE, GOOGLE_LOGIN_APP, GOOGLE_LOGIN_CLIENT_SIG);
+			return new TokenInfo(authToken, refreshToken);
+		} catch (IOException e) {
+			throw new RemoteServerException(e);
+		} catch (Gpsoauth.TokenRequestFailed e) {
+			throw new LoginFailedException(e);
+		}
+	}
+
+	@Override
+	public String getTokenId() throws LoginFailedException, RemoteServerException {
+		if (isTokenIdExpired()) {
+			this.tokenInfo = refreshToken(username, tokenInfo.refreshToken);
+		}
+		return tokenInfo.authToken.getToken();
+	}
+
+	@Override
+	public AuthInfo getAuthInfo() throws LoginFailedException, RemoteServerException {
+		AuthInfo.Builder builder = AuthInfo.newBuilder();
+		builder.setProvider("google");
+		builder.setToken(AuthInfo.JWT.newBuilder().setContents(tokenInfo.authToken.getToken()).setUnknown2(59).build());
+		return builder.build();
+	}
+
+	@Override
+	public boolean isTokenIdExpired() {
+		return tokenInfo.authToken.getExpiry() > System.currentTimeMillis() / 1000 - 60;
+	}
+
+	private static class TokenInfo {
+		final AuthToken authToken;
+		final String refreshToken;
+
+		TokenInfo(AuthToken authToken, String refreshToken) {
+			this.authToken = authToken;
+			this.refreshToken = refreshToken;
+		}
+	}
+}