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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License
*/
package com.android.voicemail.impl.transcribe.grpc;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.text.TextUtils;
import com.android.dialer.common.Assert;
import com.android.dialer.common.LogUtil;
import com.android.voicemail.impl.transcribe.TranscriptionConfigProvider;
import com.google.internal.communications.voicemailtranscription.v1.VoicemailTranscriptionServiceGrpc;
import io.grpc.CallOptions;
import io.grpc.Channel;
import io.grpc.ClientCall;
import io.grpc.ClientInterceptor;
import io.grpc.ClientInterceptors;
import io.grpc.ForwardingClientCall;
import io.grpc.ManagedChannel;
import io.grpc.ManagedChannelBuilder;
import io.grpc.Metadata;
import io.grpc.MethodDescriptor;
import io.grpc.okhttp.OkHttpChannelBuilder;
import java.security.MessageDigest;
/**
* Factory for creating grpc clients that talk to the transcription server. This allows all clients
* to share the same channel, which is relatively expensive to create.
*/
public class TranscriptionClientFactory {
private static final String DIGEST_ALGORITHM_SHA1 = "SHA1";
private static final char[] HEX_UPPERCASE = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
};
private final TranscriptionConfigProvider configProvider;
private final ManagedChannel originalChannel;
private final String packageName;
private final String cert;
public TranscriptionClientFactory(Context context, TranscriptionConfigProvider configProvider) {
this(context, configProvider, getManagedChannel(configProvider));
}
public TranscriptionClientFactory(
Context context, TranscriptionConfigProvider configProvider, ManagedChannel managedChannel) {
this.configProvider = configProvider;
this.packageName = context.getPackageName();
this.cert = getCertificateFingerprint(context);
originalChannel = managedChannel;
}
public TranscriptionClient getClient() {
LogUtil.enterBlock("TranscriptionClientFactory.getClient");
Assert.checkState(!originalChannel.isShutdown());
Channel channel =
ClientInterceptors.intercept(
originalChannel,
new Interceptor(
packageName, cert, configProvider.getApiKey(), configProvider.getAuthToken()));
return new TranscriptionClient(VoicemailTranscriptionServiceGrpc.newBlockingStub(channel));
}
public void shutdown() {
LogUtil.enterBlock("TranscriptionClientFactory.shutdown");
originalChannel.shutdown();
}
private static ManagedChannel getManagedChannel(TranscriptionConfigProvider configProvider) {
ManagedChannelBuilder<OkHttpChannelBuilder> builder =
OkHttpChannelBuilder.forTarget(configProvider.getServerAddress());
// Only use plaintext for debugging
if (configProvider.shouldUsePlaintext()) {
// Just passing 'false' doesnt have the same effect as not setting this field
builder.usePlaintext(true);
}
return builder.build();
}
private static String getCertificateFingerprint(Context context) {
try {
PackageInfo packageInfo =
context
.getPackageManager()
.getPackageInfo(context.getPackageName(), PackageManager.GET_SIGNATURES);
if (packageInfo != null
&& packageInfo.signatures != null
&& packageInfo.signatures.length > 0) {
MessageDigest messageDigest = MessageDigest.getInstance(DIGEST_ALGORITHM_SHA1);
if (messageDigest == null) {
LogUtil.w(
"TranscriptionClientFactory.getCertificateFingerprint", "error getting digest.");
return null;
}
byte[] bytes = messageDigest.digest(packageInfo.signatures[0].toByteArray());
if (bytes == null) {
LogUtil.w(
"TranscriptionClientFactory.getCertificateFingerprint", "empty message digest.");
return null;
}
int length = bytes.length;
StringBuilder out = new StringBuilder(length * 2);
for (int i = 0; i < length; i++) {
out.append(HEX_UPPERCASE[(bytes[i] & 0xf0) >>> 4]);
out.append(HEX_UPPERCASE[bytes[i] & 0x0f]);
}
return out.toString();
} else {
LogUtil.w(
"TranscriptionClientFactory.getCertificateFingerprint",
"failed to get package signature.");
}
} catch (Exception e) {
LogUtil.e(
"TranscriptionClientFactory.getCertificateFingerprint",
"error getting certificate fingerprint.",
e);
}
return null;
}
private static final class Interceptor implements ClientInterceptor {
private final String packageName;
private final String cert;
private final String apiKey;
private final String authToken;
private static final Metadata.Key<String> API_KEY_HEADER =
Metadata.Key.of("X-Goog-Api-Key", Metadata.ASCII_STRING_MARSHALLER);
private static final Metadata.Key<String> ANDROID_PACKAGE_HEADER =
Metadata.Key.of("X-Android-Package", Metadata.ASCII_STRING_MARSHALLER);
private static final Metadata.Key<String> ANDROID_CERT_HEADER =
Metadata.Key.of("X-Android-Cert", Metadata.ASCII_STRING_MARSHALLER);
private static final Metadata.Key<String> AUTHORIZATION_HEADER =
Metadata.Key.of("authorization", Metadata.ASCII_STRING_MARSHALLER);
public Interceptor(String packageName, String cert, String apiKey, String authToken) {
this.packageName = packageName;
this.cert = cert;
this.apiKey = apiKey;
this.authToken = authToken;
}
@Override
public <ReqT, RespT> ClientCall<ReqT, RespT> interceptCall(
MethodDescriptor<ReqT, RespT> method, CallOptions callOptions, Channel next) {
LogUtil.enterBlock(
"TranscriptionClientFactory.interceptCall, intercepted " + method.getFullMethodName());
ClientCall<ReqT, RespT> call = next.newCall(method, callOptions);
call =
new ForwardingClientCall.SimpleForwardingClientCall<ReqT, RespT>(call) {
@Override
public void start(Listener<RespT> responseListener, Metadata headers) {
if (!TextUtils.isEmpty(packageName)) {
LogUtil.i(
"TranscriptionClientFactory.interceptCall",
"attaching package name: " + packageName);
headers.put(ANDROID_PACKAGE_HEADER, packageName);
}
if (!TextUtils.isEmpty(cert)) {
LogUtil.i("TranscriptionClientFactory.interceptCall", "attaching android cert");
headers.put(ANDROID_CERT_HEADER, cert);
}
if (!TextUtils.isEmpty(apiKey)) {
LogUtil.i("TranscriptionClientFactory.interceptCall", "attaching API Key");
headers.put(API_KEY_HEADER, apiKey);
}
if (!TextUtils.isEmpty(authToken)) {
LogUtil.i("TranscriptionClientFactory.interceptCall", "attaching auth token");
headers.put(AUTHORIZATION_HEADER, "Bearer " + authToken);
}
super.start(responseListener, headers);
}
};
return call;
}
}
}
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