Update Dialer source to latest internal Google revision.

Previously, Android's Dialer app was developed in an internal Google
source control system and only exported to public during AOSP drops.

The Dialer team is now switching to a public development model similar
to the telephony team.

This CL represents all internal Google changes that were committed to
Dialer between the public O release and today's tip of tree on internal
master. This CL squashes those changes into a single commit.
In subsequent changes, changes will be exported on a per-commit basis.

Test: make, flash install, run
Merged-In: I45270eaa8ce732d71a1bd84b08c7fa0e99af3160
Change-Id: I529aaeb88535b9533c0ae4ef4e6c1222d4e0f1c8
PiperOrigin-RevId: 167068436

1 files changed, 196 insertions, 0 deletions

diff --git a/java/com/android/voicemail/impl/transcribe/grpc/TranscriptionClientFactory.java b/java/com/android/voicemail/impl/transcribe/grpc/TranscriptionClientFactory.java
new file mode 100644
index 000000000..c57b01fd7
--- /dev/null
+++ b/java/com/android/voicemail/impl/transcribe/grpc/TranscriptionClientFactory.java
@@ -0,0 +1,196 @@
+/*
+ * 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");
+    if (!originalChannel.isShutdown()) {
+      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;
+    }
+  }
+}