auth: Avoid com.auth0:java-jwt dependency in test (#6180)

Author: voidzcy

auth/build.gradle

@@ -3,8 +3,7 @@ dependencies {
  compile project(':grpc-api'),
  libraries.google_auth_credentials
  testCompile project(':grpc-testing'),
- libraries.google_auth_oauth2_http,
- libraries.jwt
+ libraries.google_auth_oauth2_http
  signature "org.codehaus.mojo.signature:java17:1.0@signature"
  signature "net.sf.androidscents.signature:android-api-level-14:4.0_r4@signature"
 }

auth/src/test/java/io/grpc/auth/GoogleAuthLibraryCallCredentialsTest.java

@@ -28,8 +28,6 @@
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
-import com.auth0.jwt.JWT;
-import com.auth0.jwt.interfaces.DecodedJWT;
 import com.google.auth.Credentials;
 import com.google.auth.RequestMetadataCallback;
 import com.google.auth.oauth2.AccessToken;
@@ -40,13 +38,15 @@
 import com.google.common.collect.LinkedListMultimap;
 import com.google.common.collect.ListMultimap;
 import com.google.common.collect.Multimaps;
+import com.google.common.io.BaseEncoding;
 import io.grpc.Attributes;
 import io.grpc.CallCredentials;
 import io.grpc.CallCredentials.MetadataApplier;
 import io.grpc.Metadata;
 import io.grpc.MethodDescriptor;
 import io.grpc.SecurityLevel;
 import io.grpc.Status;
+import io.grpc.internal.JsonParser;
 import io.grpc.testing.TestMethodDescriptors;
 import java.io.IOException;
 import java.net.URI;
@@ -408,13 +408,16 @@ public void jwtAccessCredentialsInRequestMetadata() throws Exception {
  verify(applier).apply(headersCaptor.capture());
  Metadata headers = headersCaptor.getValue();
  String token =
- Iterables.getOnlyElement(headers.getAll(AUTHORIZATION)).substring("Bearer".length());
- DecodedJWT decoded = JWT.decode(token);
- assertEquals("test-private-key-id", decoded.getKeyId());
- assertEquals("https://example.com:123/a.service",
- Iterables.getOnlyElement(decoded.getAudience()));
- assertEquals("test-email@example.com", decoded.getIssuer());
- assertEquals("test-email@example.com", decoded.getSubject());
+ Iterables.getOnlyElement(headers.getAll(AUTHORIZATION)).substring("Bearer ".length());
+ String[] parts = token.split("\\.", 3);
+ String jsonHeader = new String(BaseEncoding.base64Url().decode(parts[0]), US_ASCII);
+ String jsonPayload = new String(BaseEncoding.base64Url().decode(parts[1]), US_ASCII);
+ Map<?, ?> header = (Map<?, ?>) JsonParser.parse(jsonHeader);
+ assertEquals("test-private-key-id", header.get("kid"));
+ Map<?, ?> payload = (Map<?, ?>) JsonParser.parse(jsonPayload);
+ assertEquals("https://example.com:123/a.service", payload.get("aud"));
+ assertEquals("test-email@example.com", payload.get("iss"));
+ assertEquals("test-email@example.com", payload.get("sub"));
  }
 
  private int runPendingRunnables() {

build.gradle

@@ -191,7 +191,6 @@ subprojects {
  hpack: 'com.twitter:hpack:0.10.1',
  javax_annotation: 'javax.annotation:javax.annotation-api:1.2',
  jsr305: 'com.google.code.findbugs:jsr305:3.0.2',
- jwt: 'com.auth0:java-jwt:3.8.2',
  google_api_protos: 'com.google.api.grpc:proto-google-common-protos:1.12.0',
  google_auth_credentials: "com.google.auth:google-auth-library-credentials:${googleauthVersion}",
  google_auth_oauth2_http: "com.google.auth:google-auth-library-oauth2-http:${googleauthVersion}",