initial commit

Signed-off-by: Peter Siegmund <developer@mars3142.org>

src/main/java/dev/mars3142/fhq/Application.java

@@ -0,0 +1,13 @@
+package dev.mars3142.fhq;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Application {
+
+  public static void main(String[] args) {
+    SpringApplication.run(Application.class, args);
+  }
+
+}

src/main/java/dev/mars3142/fhq/edge/GCPGatewayFilter.java

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+package dev.mars3142.fhq.edge;
+
+import com.google.auth.oauth2.GoogleCredentials;
+import com.google.auth.oauth2.IdTokenCredentials;
+import com.google.auth.oauth2.IdTokenProvider;
+import java.io.IOException;
+import lombok.Getter;
+import lombok.Setter;
+import lombok.extern.slf4j.Slf4j;
+import lombok.val;
+import org.springframework.cloud.gateway.filter.GatewayFilter;
+import org.springframework.cloud.gateway.filter.factory.AbstractGatewayFilterFactory;
+import org.springframework.stereotype.Component;
+
+@Component
+@Slf4j
+public class GCPGatewayFilter extends AbstractGatewayFilterFactory<GCPGatewayFilter.Config> {
+
+  public GCPGatewayFilter() {
+    super(Config.class);
+  }
+
+  @Override
+  public GatewayFilter apply(Config config) {
+    return (exchange, chain) -> {
+      try {
+        val token = getAuthToken(config);
+        exchange.getRequest()
+            .mutate()
+            .header("X-Serverless-Authorization", "Bearer " + token);
+        return chain.filter(exchange);
+      } catch (Exception e) {
+        log.error("Error getting token", e);
+        throw new RuntimeException(e);
+      }
+    };
+  }
+
+  private String getAuthToken(Config config) throws IOException {
+    val credentials = GoogleCredentials.getApplicationDefault();
+    if (!(credentials instanceof IdTokenProvider)) {
+      throw new IllegalArgumentException("Credentials are not an instance of IdTokenProvider.");
+    }
+    val tokenCredential =
+        IdTokenCredentials.newBuilder()
+            .setIdTokenProvider((IdTokenProvider) credentials)
+            .setTargetAudience(config.getAudience())
+            .build();
+
+    return tokenCredential.refreshAccessToken().getTokenValue();
+  }
+
+  @Setter
+  @Getter
+  public static class Config {
+
+    private String audience;
+  }
+}

src/main/resources/application.yaml

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+info:
+  application:
+    name: ${spring.application.name}
+    version: '@project.version@'
+    spring-cloud-version: '@spring-cloud.version@'
+    spring-boot-version: '@project.parent.version@'
+
+server:
+  port: ${PORT:8080}
+  shutdown: graceful
+  error:
+    include-message: on_param
+    include-stacktrace: on_param
+
+spring:
+  application:
+    name: edge-service
+  cloud:
+    gateway:
+      default-filters:
+        - name: Retry
+          args:
+            retries: 3
+            methods: GET
+            series: SERVER_ERROR
+            exceptions: java.io.IOException, java.util.concurrent.TimeoutException
+            backoff:
+              firstBackoff: 50ms
+              maxBackoff: 5000ms
+      routes:
+        - id: timezone-service
+          uri: ${TIMEZONE_SERVICE_URI:http://timezone-service}
+          predicates:
+            - Path=/v1/timezone
+            - Path=/v1/timezone/**
+          filters:
+            - name: GCPGatewayFilter
+              args:
+                audience: ${TIMEZONE_SERVICE_URI:http://timezone-service}
+
+        - id: backend-service
+          uri: ${BACKEND_SERVICE_URI:http://backend-service}
+          predicates:
+            - Path=/v1/**
+          filters:
+            #- AuthGatewayFilter
+            - name: GCPGatewayFilter
+              args:
+                audience: ${BACKEND_SERVICE_URI:http://backend-service}

src/main/resources/banner.txt

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+,------.   ,--.                      ,---.                         ,--.
+|  .---' ,-|  | ,---.  ,---. ,-----.'   .-' ,---. ,--.--.,--.  ,--.`--' ,---. ,---.
+|  `--, ' .-. || .-. || .-. :'-----'`.  `-.| .-. :|  .--' \  `'  / ,--.| .--'| .-. :
+|  `---.\ `-' |' '-' '\   --.       .-'    \   --.|  |     \    /  |  |\ `--.\   --.
+`------' `---' .`-  /  `----'       `-----' `----'`--'      `--'   `--' `---' `----'
+               `---'
+${application.title} ${application.version}
+Powered by Spring Boot ${spring-boot.version}

src/main/resources/logback.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true">
+
+  <!-- use Spring default values -->
+  <appender class="ch.qos.logback.core.ConsoleAppender" name="Console">
+    <encoder>
+      <charset>utf8</charset>
+      <pattern>${CONSOLE_LOG_PATTERN}</pattern>
+    </encoder>
+  </appender>
+
+  <include resource="org/springframework/boot/logging/logback/defaults.xml"/>
+
+  <!-- LOG everything at INFO level -->
+  <logger additivity="false" level="debug" name="dev.mars3142">
+    <appender-ref ref="Console"/>
+  </logger>
+
+  <!-- LOG "dev.mars3142.*" at DEBUG level -->
+  <root level="info">
+    <appender-ref ref="Console"/>
+  </root>
+
+</configuration>

src/test/java/dev/mars3142/fhq/ApplicationTests.java

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+package dev.mars3142.fhq;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class ApplicationTests {
+
+  @Test
+  void contextLoads() {
+  }
+
+}