From 1dbc43b6027ad056130ac8e0ddad893ef2af3fd4 Mon Sep 17 00:00:00 2001 From: Sanjay Pujare Date: Fri, 8 Sep 2023 15:20:25 -0700 Subject: [PATCH 1/4] examples: add an example for OAuth --- examples/example-oauth/README.md | 70 +++++ examples/example-oauth/build.gradle | 87 +++++++ .../gradle/wrapper/gradle-wrapper.jar | Bin 0 -> 60756 bytes .../gradle/wrapper/gradle-wrapper.properties | 5 + examples/example-oauth/gradlew | 240 ++++++++++++++++++ examples/example-oauth/gradlew.bat | 91 +++++++ examples/example-oauth/pom.xml | 126 +++++++++ examples/example-oauth/settings.gradle | 8 + .../io/grpc/examples/oauth/AuthClient.java | 124 +++++++++ .../io/grpc/examples/oauth/AuthServer.java | 104 ++++++++ .../java/io/grpc/examples/oauth/Constant.java | 37 +++ .../oauth/ExampleOAuth2Credentials.java | 50 ++++ .../oauth/OAuth2ServerInterceptor.java | 70 +++++ .../src/main/proto/helloworld.proto | 37 +++ .../grpc/examples/oauth/AuthClientTest.java | 120 +++++++++ 15 files changed, 1169 insertions(+) create mode 100644 examples/example-oauth/README.md create mode 100644 examples/example-oauth/build.gradle create mode 100644 examples/example-oauth/gradle/wrapper/gradle-wrapper.jar create mode 100644 examples/example-oauth/gradle/wrapper/gradle-wrapper.properties create mode 100755 examples/example-oauth/gradlew create mode 100644 examples/example-oauth/gradlew.bat create mode 100644 examples/example-oauth/pom.xml create mode 100644 examples/example-oauth/settings.gradle create mode 100644 examples/example-oauth/src/main/java/io/grpc/examples/oauth/AuthClient.java create mode 100644 examples/example-oauth/src/main/java/io/grpc/examples/oauth/AuthServer.java create mode 100644 examples/example-oauth/src/main/java/io/grpc/examples/oauth/Constant.java create mode 100644 examples/example-oauth/src/main/java/io/grpc/examples/oauth/ExampleOAuth2Credentials.java create mode 100644 examples/example-oauth/src/main/java/io/grpc/examples/oauth/OAuth2ServerInterceptor.java create mode 100644 examples/example-oauth/src/main/proto/helloworld.proto create mode 100644 examples/example-oauth/src/test/java/io/grpc/examples/oauth/AuthClientTest.java diff --git a/examples/example-oauth/README.md b/examples/example-oauth/README.md new file mode 100644 index 00000000000..012400b6864 --- /dev/null +++ b/examples/example-oauth/README.md @@ -0,0 +1,70 @@ +Authentication Example +============================================== + +This example illustrates a simple OAuth2-based authentication implementation in gRPC using + server interceptor. It uses the Google OAuth2 library to create OAuth2 Credentials. + +The example requires grpc-java to be pre-built. Using a release tag will download the relevant binaries +from a maven repository. But if you need the latest SNAPSHOT binaries you will need to follow +[COMPILING](../../COMPILING.md) to build these. + +The source code is [here](src/main/java/io/grpc/examples/oauth). +To build the example, run in this directory: +``` +$ ../gradlew installDist +``` +The build creates scripts `auth-server` and `auth-client` in the `build/install/example-oauth/bin/` directory +which can be used to run this example. The example requires the server to be running before starting the +client. + +Running auth-server is similar to the normal hello world example and there are no arguments to supply: + +**auth-server**: + +The auth-server accepts optional argument for port on which the server should run: + +```text +USAGE: auth-server [port] +``` + +The auth-client accepts optional arguments for server-host, server-port, user-name and client-id: + +**auth-client**: + +```text +USAGE: auth-client [server-host [server-port [user-name [client-id]]]] +``` + +The `user-name` value is simply passed in the `HelloRequest` message as payload and the value of +`client-id` is included in the OAuth2 access token passed in the metadata header. + + +#### How to run the example: + +```bash +# Run the server: +./build/install/example-oauth/bin/auth-server 50051 +# In another terminal run the client +./build/install/example-oauth/bin/auth-client localhost 50051 userA clientB +``` + +That's it! The client will show the user-name reflected back in the message from the server as follows: +``` +INFO: Greeting: Hello, userA +``` + +And on the server side you will see the message with the client's identifier: +``` +Processing request from clientB +``` + +## Maven + +If you prefer to use Maven follow these [steps](../README.md#maven). You can run the example as follows: + +``` +$ # Run the server +$ mvn exec:java -Dexec.mainClass=io.grpc.examples.oauth.AuthServer -Dexec.args="50051" +$ # In another terminal run the client +$ mvn exec:java -Dexec.mainClass=io.grpc.examples.oauth.AuthClient -Dexec.args="localhost 50051 userA clientB" +``` diff --git a/examples/example-oauth/build.gradle b/examples/example-oauth/build.gradle new file mode 100644 index 00000000000..ffbe8a53617 --- /dev/null +++ b/examples/example-oauth/build.gradle @@ -0,0 +1,87 @@ +plugins { + // Provide convenience executables for trying out the examples. + id 'application' + id 'com.google.protobuf' version '0.9.4' + // Generate IntelliJ IDEA's .idea & .iml project files + id 'idea' +} + +repositories { + maven { // The google mirror is less flaky than mavenCentral() + url "https://maven-central.storage-download.googleapis.com/maven2/" + } + mavenLocal() +} + +java { + sourceCompatibility = JavaVersion.VERSION_1_8 + targetCompatibility = JavaVersion.VERSION_1_8 +} + +// IMPORTANT: You probably want the non-SNAPSHOT version of gRPC. Make sure you +// are looking at a tagged version of the example and not "master"! + +// Feel free to delete the comment at the next line. It is just for safely +// updating the version in our release process. +def grpcVersion = '1.59.0-SNAPSHOT' // CURRENT_GRPC_VERSION +def protobufVersion = '3.24.0' +def protocVersion = protobufVersion + +dependencies { + implementation "io.grpc:grpc-protobuf:${grpcVersion}" + implementation "io.grpc:grpc-stub:${grpcVersion}" + implementation "io.grpc:grpc-auth:${grpcVersion}" + implementation "com.google.auth:google-auth-library-oauth2-http:1.18.0" + + compileOnly "org.apache.tomcat:annotations-api:6.0.53" + + runtimeOnly "io.grpc:grpc-netty-shaded:${grpcVersion}" + + testImplementation "io.grpc:grpc-testing:${grpcVersion}" + testImplementation "junit:junit:4.13.2" + testImplementation "org.mockito:mockito-core:3.4.0" +} + +protobuf { + protoc { artifact = "com.google.protobuf:protoc:${protocVersion}" } + plugins { + grpc { artifact = "io.grpc:protoc-gen-grpc-java:${grpcVersion}" } + } + generateProtoTasks { + all()*.plugins { grpc {} } + } +} + +// Inform IDEs like IntelliJ IDEA, Eclipse or NetBeans about the generated code. +sourceSets { + main { + java { + srcDirs 'build/generated/source/proto/main/grpc' + srcDirs 'build/generated/source/proto/main/java' + } + } +} + +startScripts.enabled = false + +task hellowWorldOauthServer(type: CreateStartScripts) { + mainClass = 'io.grpc.examples.oauth.AuthServer' + applicationName = 'auth-server' + outputDir = new File(project.buildDir, 'tmp/scripts/' + name) + classpath = startScripts.classpath +} + +task hellowWorldOauthClient(type: CreateStartScripts) { + mainClass = 'io.grpc.examples.oauth.AuthClient' + applicationName = 'auth-client' + outputDir = new File(project.buildDir, 'tmp/scripts/' + name) + classpath = startScripts.classpath +} + +application { + applicationDistribution.into('bin') { + from(hellowWorldOauthServer) + from(hellowWorldOauthClient) + fileMode = 0755 + } +} diff --git a/examples/example-oauth/gradle/wrapper/gradle-wrapper.jar b/examples/example-oauth/gradle/wrapper/gradle-wrapper.jar new file 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You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. +DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"' + +# Use the maximum available, or set MAX_FD != -1 to use that value. +MAX_FD=maximum + +warn () { + echo "$*" +} >&2 + +die () { + echo + echo "$*" + echo + exit 1 +} >&2 + +# OS specific support (must be 'true' or 'false'). +cygwin=false +msys=false +darwin=false +nonstop=false +case "$( uname )" in #( + CYGWIN* ) cygwin=true ;; #( + Darwin* ) darwin=true ;; #( + MSYS* | MINGW* ) msys=true ;; #( + NONSTOP* ) nonstop=true ;; +esac + +CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar + + +# Determine the Java command to use to start the JVM. +if [ -n "$JAVA_HOME" ] ; then + if [ -x "$JAVA_HOME/jre/sh/java" ] ; then + # IBM's JDK on AIX uses strange locations for the executables + JAVACMD=$JAVA_HOME/jre/sh/java + else + JAVACMD=$JAVA_HOME/bin/java + fi + if [ ! -x "$JAVACMD" ] ; then + die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME + +Please set the JAVA_HOME variable in your environment to match the +location of your Java installation." + fi +else + JAVACMD=java + which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. + +Please set the JAVA_HOME variable in your environment to match the +location of your Java installation." +fi + +# Increase the maximum file descriptors if we can. +if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then + case $MAX_FD in #( + max*) + MAX_FD=$( ulimit -H -n ) || + warn "Could not query maximum file descriptor limit" + esac + case $MAX_FD in #( + '' | soft) :;; #( + *) + ulimit -n "$MAX_FD" || + warn "Could not set maximum file descriptor limit to $MAX_FD" + esac +fi + +# Collect all arguments for the java command, stacking in reverse order: +# * args from the command line +# * the main class name +# * -classpath +# * -D...appname settings +# * --module-path (only if needed) +# * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables. + +# For Cygwin or MSYS, switch paths to Windows format before running java +if "$cygwin" || "$msys" ; then + APP_HOME=$( cygpath --path --mixed "$APP_HOME" ) + CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" ) + + JAVACMD=$( cygpath --unix "$JAVACMD" ) + + # Now convert the arguments - kludge to limit ourselves to /bin/sh + for arg do + if + case $arg in #( + -*) false ;; # don't mess with options #( + /?*) t=${arg#/} t=/${t%%/*} # looks like a POSIX filepath + [ -e "$t" ] ;; #( + *) false ;; + esac + then + arg=$( cygpath --path --ignore --mixed "$arg" ) + fi + # Roll the args list around exactly as many times as the number of + # args, so each arg winds up back in the position where it started, but + # possibly modified. + # + # NB: a `for` loop captures its iteration list before it begins, so + # changing the positional parameters here affects neither the number of + # iterations, nor the values presented in `arg`. + shift # remove old arg + set -- "$@" "$arg" # push replacement arg + done +fi + +# Collect all arguments for the java command; +# * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of +# shell script including quotes and variable substitutions, so put them in +# double quotes to make sure that they get re-expanded; and +# * put everything else in single quotes, so that it's not re-expanded. + +set -- \ + "-Dorg.gradle.appname=$APP_BASE_NAME" \ + -classpath "$CLASSPATH" \ + org.gradle.wrapper.GradleWrapperMain \ + "$@" + +# Stop when "xargs" is not available. +if ! command -v xargs >/dev/null 2>&1 +then + die "xargs is not available" +fi + +# Use "xargs" to parse quoted args. +# +# With -n1 it outputs one arg per line, with the quotes and backslashes removed. +# +# In Bash we could simply go: +# +# readarray ARGS < <( xargs -n1 <<<"$var" ) && +# set -- "${ARGS[@]}" "$@" +# +# but POSIX shell has neither arrays nor command substitution, so instead we +# post-process each arg (as a line of input to sed) to backslash-escape any +# character that might be a shell metacharacter, then use eval to reverse +# that process (while maintaining the separation between arguments), and wrap +# the whole thing up as a single "set" statement. +# +# This will of course break if any of these variables contains a newline or +# an unmatched quote. +# + +eval "set -- $( + printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" | + xargs -n1 | + sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' | + tr '\n' ' ' + )" '"$@"' + +exec "$JAVACMD" "$@" diff --git a/examples/example-oauth/gradlew.bat b/examples/example-oauth/gradlew.bat new file mode 100644 index 00000000000..53a6b238d41 --- /dev/null +++ b/examples/example-oauth/gradlew.bat @@ -0,0 +1,91 @@ +@rem +@rem Copyright 2015 the original author or authors. +@rem +@rem Licensed under the Apache License, Version 2.0 (the "License"); +@rem you may not use this file except in compliance with the License. +@rem You may obtain a copy of the License at +@rem +@rem https://www.apache.org/licenses/LICENSE-2.0 +@rem +@rem Unless required by applicable law or agreed to in writing, software +@rem distributed under the License is distributed on an "AS IS" BASIS, +@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +@rem See the License for the specific language governing permissions and +@rem limitations under the License. +@rem + +@if "%DEBUG%"=="" @echo off +@rem ########################################################################## +@rem +@rem Gradle startup script for Windows +@rem +@rem ########################################################################## + +@rem Set local scope for the variables with windows NT shell +if "%OS%"=="Windows_NT" setlocal + +set DIRNAME=%~dp0 +if "%DIRNAME%"=="" set DIRNAME=. +set APP_BASE_NAME=%~n0 +set APP_HOME=%DIRNAME% + +@rem Resolve any "." and ".." in APP_HOME to make it shorter. +for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi + +@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. +set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m" + +@rem Find java.exe +if defined JAVA_HOME goto findJavaFromJavaHome + +set JAVA_EXE=java.exe +%JAVA_EXE% -version >NUL 2>&1 +if %ERRORLEVEL% equ 0 goto execute + +echo. +echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. +echo. +echo Please set the JAVA_HOME variable in your environment to match the +echo location of your Java installation. + +goto fail + +:findJavaFromJavaHome +set JAVA_HOME=%JAVA_HOME:"=% +set JAVA_EXE=%JAVA_HOME%/bin/java.exe + +if exist "%JAVA_EXE%" goto execute + +echo. +echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% +echo. +echo Please set the JAVA_HOME variable in your environment to match the +echo location of your Java installation. + +goto fail + +:execute +@rem Setup the command line + +set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar + + +@rem Execute Gradle +"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %* + +:end +@rem End local scope for the variables with windows NT shell +if %ERRORLEVEL% equ 0 goto mainEnd + +:fail +rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of +rem the _cmd.exe /c_ return code! +set EXIT_CODE=%ERRORLEVEL% +if %EXIT_CODE% equ 0 set EXIT_CODE=1 +if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE% +exit /b %EXIT_CODE% + +:mainEnd +if "%OS%"=="Windows_NT" endlocal + +:omega diff --git a/examples/example-oauth/pom.xml b/examples/example-oauth/pom.xml new file mode 100644 index 00000000000..929002c9a1d --- /dev/null +++ b/examples/example-oauth/pom.xml @@ -0,0 +1,126 @@ + + 4.0.0 + io.grpc + example-oauth + jar + + 1.59.0-SNAPSHOT + example-oauth + https://github.com/grpc/grpc-java + + + UTF-8 + 1.59.0-SNAPSHOT + 3.24.0 + 3.24.0 + + 1.8 + 1.8 + + + + + + io.grpc + grpc-bom + ${grpc.version} + pom + import + + + + + + + io.grpc + grpc-netty-shaded + runtime + + + io.grpc + grpc-protobuf + + + io.grpc + grpc-stub + + + org.apache.tomcat + annotations-api + 6.0.53 + provided + + + io.grpc + grpc-testing + test + + + junit + junit + 4.13.2 + test + + + org.mockito + mockito-core + 3.4.0 + test + + + + + + + kr.motd.maven + os-maven-plugin + 1.7.1 + + + + + org.xolstice.maven.plugins + protobuf-maven-plugin + 0.5.1 + + + com.google.protobuf:protoc:${protoc.version}:exe:${os.detected.classifier} + + grpc-java + + io.grpc:protoc-gen-grpc-java:${grpc.version}:exe:${os.detected.classifier} + + + + + + compile + compile-custom + + + + + + org.apache.maven.plugins + maven-enforcer-plugin + 1.4.1 + + + enforce + + enforce + + + + + + + + + + + + diff --git a/examples/example-oauth/settings.gradle b/examples/example-oauth/settings.gradle new file mode 100644 index 00000000000..273558dd9cf --- /dev/null +++ b/examples/example-oauth/settings.gradle @@ -0,0 +1,8 @@ +pluginManagement { + repositories { + maven { // The google mirror is less flaky than mavenCentral() + url "https://maven-central.storage-download.googleapis.com/maven2/" + } + gradlePluginPortal() + } +} diff --git a/examples/example-oauth/src/main/java/io/grpc/examples/oauth/AuthClient.java b/examples/example-oauth/src/main/java/io/grpc/examples/oauth/AuthClient.java new file mode 100644 index 00000000000..33e5182430c --- /dev/null +++ b/examples/example-oauth/src/main/java/io/grpc/examples/oauth/AuthClient.java @@ -0,0 +1,124 @@ +/* + * Copyright 2023 The gRPC Authors + * + * 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 io.grpc.examples.oauth; + +import io.grpc.CallCredentials; +import io.grpc.Grpc; +import io.grpc.InsecureChannelCredentials; +import io.grpc.ManagedChannel; +import io.grpc.examples.helloworld.GreeterGrpc; +import io.grpc.examples.helloworld.HelloReply; +import io.grpc.examples.helloworld.HelloRequest; +import io.grpc.auth.MoreCallCredentials; +import java.util.concurrent.TimeUnit; +import java.util.logging.Logger; + +/** + * An authenticating client that requests a greeting from the {@link AuthServer}. + */ +public class AuthClient { + + private static final Logger logger = Logger.getLogger(AuthClient.class.getName()); + + private final ManagedChannel channel; + private final GreeterGrpc.GreeterBlockingStub blockingStub; + private final CallCredentials callCredentials; + + /** + * Construct client for accessing GreeterGrpc server. + */ + AuthClient(CallCredentials callCredentials, String host, int port) { + this( + callCredentials, + // For this example we use plaintext to avoid needing certificates, but it is + // recommended to use TlsChannelCredentials. + Grpc.newChannelBuilderForAddress(host, port, InsecureChannelCredentials.create()) + .build()); + } + + /** + * Construct client for accessing GreeterGrpc server using the existing channel. + */ + AuthClient(CallCredentials callCredentials, ManagedChannel channel) { + this.callCredentials = callCredentials; + this.channel = channel; + this.blockingStub = GreeterGrpc.newBlockingStub(channel); + } + + public void shutdown() throws InterruptedException { + channel.shutdown().awaitTermination(5, TimeUnit.SECONDS); + } + + /** + * Say hello to server. + * + * @param name name to set in HelloRequest + * @return the message in the HelloReply from the server + */ + public String greet(String name) { + logger.info("Will try to greet " + name + " ..."); + HelloRequest request = HelloRequest.newBuilder().setName(name).build(); + + // Use a stub with the given call credentials applied to invoke the RPC. + HelloReply response = + blockingStub + .withCallCredentials(callCredentials) // callCredentials + .sayHello(request); + + logger.info("Greeting: " + response.getMessage()); + return response.getMessage(); + } + + private static CallCredentials getOauthCred(String clientId) { + ExampleOAuth2Credentials oAuth2Credentials = new ExampleOAuth2Credentials(clientId); + return MoreCallCredentials.from(oAuth2Credentials); + } + + /** + * Greet server. If provided, the first element of {@code args} is the name to use in the greeting + * and the second is the client identifier to set in JWT + */ + public static void main(String[] args) throws Exception { + + String host = "localhost"; + int port = 50051; + String user = "world"; + String clientId = "default-client"; + + if (args.length > 0) { + host = args[0]; // Use the arg as the server host if provided + } + if (args.length > 1) { + port = Integer.parseInt(args[1]); // Use the second argument as the server port if provided + } + if (args.length > 2) { + user = args[2]; // Use the the third argument as the name to greet if provided + } + if (args.length > 3) { + clientId = args[3]; // Use the fourth argument as the client identifier if provided + } + + CallCredentials credentials = getOauthCred(clientId); + AuthClient client = new AuthClient(credentials, host, port); + + try { + client.greet(user); + } finally { + client.shutdown(); + } + } +} diff --git a/examples/example-oauth/src/main/java/io/grpc/examples/oauth/AuthServer.java b/examples/example-oauth/src/main/java/io/grpc/examples/oauth/AuthServer.java new file mode 100644 index 00000000000..c44d55476da --- /dev/null +++ b/examples/example-oauth/src/main/java/io/grpc/examples/oauth/AuthServer.java @@ -0,0 +1,104 @@ +/* + * Copyright 2023 The gRPC Authors + * + * 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 io.grpc.examples.oauth; + +import io.grpc.Grpc; +import io.grpc.InsecureServerCredentials; +import io.grpc.Server; +import io.grpc.examples.helloworld.GreeterGrpc; +import io.grpc.examples.helloworld.HelloReply; +import io.grpc.examples.helloworld.HelloRequest; +import io.grpc.stub.StreamObserver; +import java.io.IOException; +import java.util.logging.Logger; + +/** + * Server that manages startup/shutdown of a {@code Greeter} server. This also uses a + * {@link OAuth2ServerInterceptor} to intercept the OAuth2 token passed. + */ +public class AuthServer { + + private static final Logger logger = Logger.getLogger(AuthServer.class.getName()); + + private Server server; + private int port; + + public AuthServer(int port) { + this.port = port; + } + + private void start() throws IOException { + server = Grpc.newServerBuilderForPort(port, InsecureServerCredentials.create()) + .addService(new GreeterImpl()) + .intercept(new OAuth2ServerInterceptor()) + .build() + .start(); + logger.info("Server started, listening on " + port); + Runtime.getRuntime().addShutdownHook(new Thread() { + @Override + public void run() { + // Use stderr here since the logger may have been reset by its JVM shutdown hook. + System.err.println("*** shutting down gRPC server since JVM is shutting down"); + AuthServer.this.stop(); + System.err.println("*** server shut down"); + } + }); + } + + private void stop() { + if (server != null) { + server.shutdown(); + } + } + + /** + * Await termination on the main thread since the grpc library uses daemon threads. + */ + private void blockUntilShutdown() throws InterruptedException { + if (server != null) { + server.awaitTermination(); + } + } + + /** + * Main launches the server from the command line. + */ + public static void main(String[] args) throws IOException, InterruptedException { + + // The port on which the server should run + int port = 50051; // default + if (args.length > 0) { + port = Integer.parseInt(args[0]); + } + + final AuthServer server = new AuthServer(port); + server.start(); + server.blockUntilShutdown(); + } + + static class GreeterImpl extends GreeterGrpc.GreeterImplBase { + @Override + public void sayHello(HelloRequest req, StreamObserver responseObserver) { + // get client id added to context by interceptor + String clientId = Constant.CLIENT_ID_CONTEXT_KEY.get(); + logger.info("Processing request from " + clientId); + HelloReply reply = HelloReply.newBuilder().setMessage("Hello, " + req.getName()).build(); + responseObserver.onNext(reply); + responseObserver.onCompleted(); + } + } +} diff --git a/examples/example-oauth/src/main/java/io/grpc/examples/oauth/Constant.java b/examples/example-oauth/src/main/java/io/grpc/examples/oauth/Constant.java new file mode 100644 index 00000000000..cec9e35fe05 --- /dev/null +++ b/examples/example-oauth/src/main/java/io/grpc/examples/oauth/Constant.java @@ -0,0 +1,37 @@ +/* + * Copyright 2023 The gRPC Authors + * + * 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 io.grpc.examples.oauth; + +import static io.grpc.Metadata.ASCII_STRING_MARSHALLER; + +import io.grpc.Context; +import io.grpc.Metadata; + +/** + * Constants definition + */ +final class Constant { + + static final String REFRESH_SUFFIX = "+1"; + static final String ACCESS_TOKEN = "access-token"; + static final Context.Key CLIENT_ID_CONTEXT_KEY = Context.key("clientId"); + static final Metadata.Key AUTHORIZATION_METADATA_KEY = Metadata.Key.of("Authorization", ASCII_STRING_MARSHALLER); + + private Constant() { + throw new AssertionError(); + } +} diff --git a/examples/example-oauth/src/main/java/io/grpc/examples/oauth/ExampleOAuth2Credentials.java b/examples/example-oauth/src/main/java/io/grpc/examples/oauth/ExampleOAuth2Credentials.java new file mode 100644 index 00000000000..3ae482b92fa --- /dev/null +++ b/examples/example-oauth/src/main/java/io/grpc/examples/oauth/ExampleOAuth2Credentials.java @@ -0,0 +1,50 @@ +/* + * Copyright 2023 The gRPC Authors + * + * 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 io.grpc.examples.oauth; + +import com.google.auth.oauth2.AccessToken; +import com.google.auth.oauth2.OAuth2Credentials; +import java.io.IOException; +import java.time.Instant; +import java.util.Date; + +/** + * Subclass of {@link OAuth2Credentials } with a simple implementation of + * {@link OAuth2Credentials#refreshAccessToken()}. + */ +public class ExampleOAuth2Credentials extends OAuth2Credentials { + + public ExampleOAuth2Credentials(String clientId) { + super(new AccessToken(Constant.ACCESS_TOKEN + ":" + clientId, + new Date())); + } + + + /** + * Refreshes access token by simply appending ":+1" to the previous value. + */ + @Override + public AccessToken refreshAccessToken() throws IOException { + AccessToken accessToken = getAccessToken(); + if (accessToken == null) { + throw new IOException("No existing token found"); + } + String tokenValue = accessToken.getTokenValue(); + return new AccessToken(tokenValue + ":" + Constant.REFRESH_SUFFIX, + Date.from((Instant.now().plusSeconds(120)))); + } +} diff --git a/examples/example-oauth/src/main/java/io/grpc/examples/oauth/OAuth2ServerInterceptor.java b/examples/example-oauth/src/main/java/io/grpc/examples/oauth/OAuth2ServerInterceptor.java new file mode 100644 index 00000000000..289b996533c --- /dev/null +++ b/examples/example-oauth/src/main/java/io/grpc/examples/oauth/OAuth2ServerInterceptor.java @@ -0,0 +1,70 @@ +/* + * Copyright 2023 The gRPC Authors + * + * 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 io.grpc.examples.oauth; + +import io.grpc.Context; +import io.grpc.Contexts; +import io.grpc.Metadata; +import io.grpc.ServerCall; +import io.grpc.ServerCallHandler; +import io.grpc.ServerInterceptor; +import io.grpc.Status; + +/** + * This interceptor gets the OAuth2 access token from metadata, verifies it and sets the client + * identifier obtained from the token into the context. The one check it does on the access token + * is that the token has been refreshed at least once. + */ +class OAuth2ServerInterceptor implements ServerInterceptor { + + private static final String BEARER_TYPE = "Bearer"; + + @Override + public ServerCall.Listener interceptCall(ServerCall serverCall, + Metadata metadata, ServerCallHandler serverCallHandler) { + String value = metadata.get(Constant.AUTHORIZATION_METADATA_KEY); + + Status status = Status.OK; + if (value == null) { + status = Status.UNAUTHENTICATED.withDescription("Authorization token is missing"); + } else if (!value.startsWith(BEARER_TYPE)) { + status = Status.UNAUTHENTICATED.withDescription("Unknown authorization type"); + } else { + // remove authorization type prefix + String tokenValue = value.substring(BEARER_TYPE.length()).trim(); + if (!tokenValue.startsWith(Constant.ACCESS_TOKEN)) { + status = Status.UNAUTHENTICATED.withDescription("Invalid access token value"); + } else { + String[] tokens = tokenValue.split(":"); + if (tokens.length >= 3 && tokens[2].equals(Constant.REFRESH_SUFFIX)) { + // set access tokenValue into current context + Context ctx = Context.current() + .withValue(Constant.CLIENT_ID_CONTEXT_KEY, tokens[1]); + return Contexts.interceptCall(ctx, serverCall, metadata, serverCallHandler); + } else { + status = Status.UNAUTHENTICATED.withDescription("stale credentials"); + } + } + } + + serverCall.close(status, new Metadata()); + return new ServerCall.Listener() { + // noop + }; + } + +} diff --git a/examples/example-oauth/src/main/proto/helloworld.proto b/examples/example-oauth/src/main/proto/helloworld.proto new file mode 100644 index 00000000000..6340c54f7bb --- /dev/null +++ b/examples/example-oauth/src/main/proto/helloworld.proto @@ -0,0 +1,37 @@ +// Copyright 2019 The gRPC Authors +// +// 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. +syntax = "proto3"; + +option java_multiple_files = true; +option java_package = "io.grpc.examples.helloworld"; +option java_outer_classname = "HelloWorldProto"; +option objc_class_prefix = "HLW"; + +package helloworld; + +// The greeting service definition. +service Greeter { + // Sends a greeting + rpc SayHello (HelloRequest) returns (HelloReply) {} +} + +// The request message containing the user's name. +message HelloRequest { + string name = 1; +} + +// The response message containing the greetings +message HelloReply { + string message = 1; +} diff --git a/examples/example-oauth/src/test/java/io/grpc/examples/oauth/AuthClientTest.java b/examples/example-oauth/src/test/java/io/grpc/examples/oauth/AuthClientTest.java new file mode 100644 index 00000000000..739018cc5a8 --- /dev/null +++ b/examples/example-oauth/src/test/java/io/grpc/examples/oauth/AuthClientTest.java @@ -0,0 +1,120 @@ +/* + * Copyright 2023 The gRPC Authors + * + * 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 io.grpc.examples.oauth; + +import static org.junit.Assert.assertEquals; +import static org.junit.Assert.assertNotNull; +import static org.junit.Assert.assertTrue; +import static org.mockito.AdditionalAnswers.delegatesTo; +import static org.mockito.Mockito.mock; +import static org.mockito.Mockito.verify; + +import io.grpc.CallCredentials; +import io.grpc.ManagedChannel; +import io.grpc.Metadata; +import io.grpc.ServerCall; +import io.grpc.ServerCallHandler; +import io.grpc.ServerInterceptors; +import io.grpc.auth.MoreCallCredentials; +import io.grpc.examples.helloworld.GreeterGrpc; +import io.grpc.examples.helloworld.HelloReply; +import io.grpc.examples.helloworld.HelloRequest; +import io.grpc.inprocess.InProcessChannelBuilder; +import io.grpc.inprocess.InProcessServerBuilder; +import io.grpc.ServerCall.Listener; +import io.grpc.ServerInterceptor; +import io.grpc.stub.StreamObserver; +import io.grpc.testing.GrpcCleanupRule; +import java.io.IOException; +import org.junit.Before; +import org.junit.Rule; +import org.junit.Test; +import org.junit.runner.RunWith; +import org.junit.runners.JUnit4; +import org.mockito.ArgumentCaptor; +import org.mockito.ArgumentMatchers; + +/** + * Unit tests for {@link AuthClient} testing the default and non-default tokens + * + * + */ +@RunWith(JUnit4.class) +public class AuthClientTest { + /** + * This rule manages automatic graceful shutdown for the registered servers and channels at the + * end of test. + */ + @Rule + public final GrpcCleanupRule grpcCleanup = new GrpcCleanupRule(); + + private final ServerInterceptor mockServerInterceptor = mock(ServerInterceptor.class, delegatesTo( + new ServerInterceptor() { + @Override + public Listener interceptCall( + ServerCall call, Metadata headers, ServerCallHandler next) { + return next.startCall(call, headers); + } + })); + + private AuthClient client; + + + @Before + public void setUp() throws IOException { + // Generate a unique in-process server name. + String serverName = InProcessServerBuilder.generateName(); + + // Create a server, add service, start, and register for automatic graceful shutdown. + grpcCleanup.register(InProcessServerBuilder.forName(serverName).directExecutor() + .addService(ServerInterceptors.intercept( + new GreeterGrpc.GreeterImplBase() { + + @Override + public void sayHello( + HelloRequest request, StreamObserver responseObserver) { + HelloReply reply = HelloReply.newBuilder() + .setMessage("AuthClientTest user=" + request.getName()).build(); + responseObserver.onNext(reply); + responseObserver.onCompleted(); + } + }, + mockServerInterceptor)) + .build().start()); + + CallCredentials credentials = MoreCallCredentials.from( + new ExampleOAuth2Credentials("test-client")); + ManagedChannel channel = InProcessChannelBuilder.forName(serverName).directExecutor().build(); + client = new AuthClient(credentials, channel); + } + + @Test + public void greet() { + ArgumentCaptor metadataCaptor = ArgumentCaptor.forClass(Metadata.class); + String retVal = client.greet("John"); + + verify(mockServerInterceptor).interceptCall( + ArgumentMatchers.>any(), + metadataCaptor.capture(), + ArgumentMatchers.>any()); + + String token = metadataCaptor.getValue().get(Constant.AUTHORIZATION_METADATA_KEY); + assertNotNull(token); + assertTrue(token.startsWith("Bearer")); + assertEquals("AuthClientTest user=John", retVal); + } +} From b7adcfd0f76e73ac3cecfbfc59ba2b79951e6fed Mon Sep 17 00:00:00 2001 From: Sanjay Pujare Date: Fri, 15 Sep 2023 23:28:55 -0700 Subject: [PATCH 2/4] address review comments and fix pom.xml to include Google OAuth2 dependency --- examples/README.md | 2 ++ examples/example-oauth/README.md | 5 ++++- examples/example-oauth/pom.xml | 5 +++++ .../java/io/grpc/examples/oauth/AuthClient.java | 2 +- .../main/java/io/grpc/examples/oauth/Constant.java | 1 - .../examples/oauth/ExampleOAuth2Credentials.java | 12 +++++++++++- .../examples/oauth/OAuth2ServerInterceptor.java | 14 +++++++++----- 7 files changed, 32 insertions(+), 9 deletions(-) diff --git a/examples/README.md b/examples/README.md index 9664942b5fa..b51d560d7bb 100644 --- a/examples/README.md +++ b/examples/README.md @@ -205,6 +205,8 @@ $ bazel-bin/hello-world-client - [JWT-based Authentication](example-jwt-auth) +- [OAuth2-based Authentication](example-oauth) + - [Pre-serialized messages](src/main/java/io/grpc/examples/preserialized) ## Unit test examples diff --git a/examples/example-oauth/README.md b/examples/example-oauth/README.md index 012400b6864..6370a3a1ecb 100644 --- a/examples/example-oauth/README.md +++ b/examples/example-oauth/README.md @@ -2,7 +2,10 @@ Authentication Example ============================================== This example illustrates a simple OAuth2-based authentication implementation in gRPC using - server interceptor. It uses the Google OAuth2 library to create OAuth2 Credentials. + server interceptor. It uses the Google OAuth2 library since it already has the OAuth2 +semantics which makes it easy to illustrate the OAuth2 flow. The example creates an OAuth2 +credentials using the library and converts it to gRPC CallCredentials. However, if you may +use your own OAuth2 implementation, so use of Google OAuth2 library is not necessary. The example requires grpc-java to be pre-built. Using a release tag will download the relevant binaries from a maven repository. But if you need the latest SNAPSHOT binaries you will need to follow diff --git a/examples/example-oauth/pom.xml b/examples/example-oauth/pom.xml index 929002c9a1d..2ec688c3570 100644 --- a/examples/example-oauth/pom.xml +++ b/examples/example-oauth/pom.xml @@ -47,6 +47,11 @@ io.grpc grpc-stub + + com.google.auth + google-auth-library-oauth2-http + 1.18.0 + org.apache.tomcat annotations-api diff --git a/examples/example-oauth/src/main/java/io/grpc/examples/oauth/AuthClient.java b/examples/example-oauth/src/main/java/io/grpc/examples/oauth/AuthClient.java index 33e5182430c..a43f6fbd98e 100644 --- a/examples/example-oauth/src/main/java/io/grpc/examples/oauth/AuthClient.java +++ b/examples/example-oauth/src/main/java/io/grpc/examples/oauth/AuthClient.java @@ -51,7 +51,7 @@ public class AuthClient { } /** - * Construct client for accessing GreeterGrpc server using the existing channel. + * Construct a client for accessing GreeterGrpc server using an existing channel. */ AuthClient(CallCredentials callCredentials, ManagedChannel channel) { this.callCredentials = callCredentials; diff --git a/examples/example-oauth/src/main/java/io/grpc/examples/oauth/Constant.java b/examples/example-oauth/src/main/java/io/grpc/examples/oauth/Constant.java index cec9e35fe05..1db9b6e4e47 100644 --- a/examples/example-oauth/src/main/java/io/grpc/examples/oauth/Constant.java +++ b/examples/example-oauth/src/main/java/io/grpc/examples/oauth/Constant.java @@ -32,6 +32,5 @@ final class Constant { static final Metadata.Key AUTHORIZATION_METADATA_KEY = Metadata.Key.of("Authorization", ASCII_STRING_MARSHALLER); private Constant() { - throw new AssertionError(); } } diff --git a/examples/example-oauth/src/main/java/io/grpc/examples/oauth/ExampleOAuth2Credentials.java b/examples/example-oauth/src/main/java/io/grpc/examples/oauth/ExampleOAuth2Credentials.java index 3ae482b92fa..e2171ea20f4 100644 --- a/examples/example-oauth/src/main/java/io/grpc/examples/oauth/ExampleOAuth2Credentials.java +++ b/examples/example-oauth/src/main/java/io/grpc/examples/oauth/ExampleOAuth2Credentials.java @@ -24,10 +24,18 @@ /** * Subclass of {@link OAuth2Credentials } with a simple implementation of - * {@link OAuth2Credentials#refreshAccessToken()}. + * {@link OAuth2Credentials#refreshAccessToken()}. A real implementation + * will maintain a refresh token and use it to exchange it for a new + * access token from the authorization server. */ public class ExampleOAuth2Credentials extends OAuth2Credentials { + /** + * Creates an access token using the passed in clientId. A real + * implementation will contact the authorization server to get an access + * token and a refresh token. + * + */ public ExampleOAuth2Credentials(String clientId) { super(new AccessToken(Constant.ACCESS_TOKEN + ":" + clientId, new Date())); @@ -36,6 +44,8 @@ public ExampleOAuth2Credentials(String clientId) { /** * Refreshes access token by simply appending ":+1" to the previous value. + * A real implementation will use the existing refresh token to get + * fresh access and refresh tokens from the authorization server. */ @Override public AccessToken refreshAccessToken() throws IOException { diff --git a/examples/example-oauth/src/main/java/io/grpc/examples/oauth/OAuth2ServerInterceptor.java b/examples/example-oauth/src/main/java/io/grpc/examples/oauth/OAuth2ServerInterceptor.java index 289b996533c..032c9297de4 100644 --- a/examples/example-oauth/src/main/java/io/grpc/examples/oauth/OAuth2ServerInterceptor.java +++ b/examples/example-oauth/src/main/java/io/grpc/examples/oauth/OAuth2ServerInterceptor.java @@ -28,6 +28,9 @@ * This interceptor gets the OAuth2 access token from metadata, verifies it and sets the client * identifier obtained from the token into the context. The one check it does on the access token * is that the token has been refreshed at least once. + * + * A real implementation will validate the access token using the resource server (or the + * authorization server). */ class OAuth2ServerInterceptor implements ServerInterceptor { @@ -36,18 +39,18 @@ class OAuth2ServerInterceptor implements ServerInterceptor { @Override public ServerCall.Listener interceptCall(ServerCall serverCall, Metadata metadata, ServerCallHandler serverCallHandler) { - String value = metadata.get(Constant.AUTHORIZATION_METADATA_KEY); + String authHeaderValue = metadata.get(Constant.AUTHORIZATION_METADATA_KEY); Status status = Status.OK; - if (value == null) { + if (authHeaderValue == null) { status = Status.UNAUTHENTICATED.withDescription("Authorization token is missing"); - } else if (!value.startsWith(BEARER_TYPE)) { + } else if (!authHeaderValue.startsWith(BEARER_TYPE)) { status = Status.UNAUTHENTICATED.withDescription("Unknown authorization type"); } else { // remove authorization type prefix - String tokenValue = value.substring(BEARER_TYPE.length()).trim(); + String tokenValue = authHeaderValue.substring(BEARER_TYPE.length()).trim(); if (!tokenValue.startsWith(Constant.ACCESS_TOKEN)) { - status = Status.UNAUTHENTICATED.withDescription("Invalid access token value"); + status = Status.UNAUTHENTICATED.withDescription("Invalid access token authHeaderValue"); } else { String[] tokens = tokenValue.split(":"); if (tokens.length >= 3 && tokens[2].equals(Constant.REFRESH_SUFFIX)) { @@ -61,6 +64,7 @@ public ServerCall.Listener interceptCall(ServerCall() { // noop From 8d9e5da551917258156f274a904561bee7990ed7 Mon Sep 17 00:00:00 2001 From: Sanjay Pujare Date: Fri, 15 Sep 2023 23:58:46 -0700 Subject: [PATCH 3/4] fix the RequireUpperBoundDeps issue related to google-auth-library-credentials --- examples/example-oauth/pom.xml | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/examples/example-oauth/pom.xml b/examples/example-oauth/pom.xml index 2ec688c3570..2812166e589 100644 --- a/examples/example-oauth/pom.xml +++ b/examples/example-oauth/pom.xml @@ -47,6 +47,16 @@ io.grpc grpc-stub + + io.grpc + grpc-auth + + + com.google.auth + google-auth-library-credentials + + + com.google.auth google-auth-library-oauth2-http From 92ba676e82d28b8cafc975874be41679cb408fd1 Mon Sep 17 00:00:00 2001 From: Sanjay Pujare Date: Mon, 18 Sep 2023 09:18:34 -0700 Subject: [PATCH 4/4] fix readme typo --- examples/example-oauth/README.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/examples/example-oauth/README.md b/examples/example-oauth/README.md index 6370a3a1ecb..26a6e223f60 100644 --- a/examples/example-oauth/README.md +++ b/examples/example-oauth/README.md @@ -4,7 +4,7 @@ Authentication Example This example illustrates a simple OAuth2-based authentication implementation in gRPC using server interceptor. It uses the Google OAuth2 library since it already has the OAuth2 semantics which makes it easy to illustrate the OAuth2 flow. The example creates an OAuth2 -credentials using the library and converts it to gRPC CallCredentials. However, if you may +credentials using the library and converts it to gRPC CallCredentials. However, you may use your own OAuth2 implementation, so use of Google OAuth2 library is not necessary. The example requires grpc-java to be pre-built. Using a release tag will download the relevant binaries