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Spring BFF/ReverseProxy/Dockerfile

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+# Use an official Java runtime as a parent image
+FROM openjdk:17-jdk-alpine
+
+# Create user to run the app as (instead of root)
+RUN addgroup -S app && adduser -S app -G app
+
+# User user "app"
+USER app
+
+# Set the working directory in the container
+WORKDIR /app
+
+# Copy the JAR file into the container
+COPY build/libs/ReverseProxy-0.0.1-SNAPSHOT.jar /app/app.jar
+
+# Set the command to run the JAR file
+ENTRYPOINT ["java", "-jar", "/app/app.jar"]
+
+# Expose the port the app runs on
+EXPOSE 8080

Spring BFF/ReverseProxy/build.gradle.kts

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+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+plugins {
+    id("org.springframework.boot") version "3.3.2"
+    id("io.spring.dependency-management") version "1.1.6"
+    kotlin("jvm") version "1.9.24"
+    kotlin("plugin.spring") version "1.9.24"
+    application
+}
+
+application {
+    mainClass.set("com.example.reverseproxy.ReverseProxyApplicationKt")
+}
+
+group = "com.example"
+version = "0.0.1-SNAPSHOT"
+
+java {
+    sourceCompatibility = JavaVersion.VERSION_17
+}
+
+configurations {
+    compileOnly {
+        extendsFrom(configurations.annotationProcessor.get())
+    }
+}
+
+repositories {
+    mavenCentral()
+}
+
+extra["springCloudVersion"] = "2023.0.3"
+
+dependencies {
+    /* kotlin co-routines */
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-reactor")
+
+    /* kotlin reflection */
+    implementation("org.jetbrains.kotlin:kotlin-reflect")
+
+    /* spring web */
+    implementation("org.springframework.boot:spring-boot-autoconfigure")
+
+    /* spring cloud gateway */
+    implementation("org.springframework.cloud:spring-cloud-starter-gateway")
+    implementation("org.springframework.boot:spring-boot-starter-actuator")
+
+    /* test - dependencies */
+    testImplementation("org.springframework.boot:spring-boot-starter-test")
+    testImplementation("org.jetbrains.kotlin:kotlin-test-junit5")
+
+//    testImplementation("io.projectreactor:reactor-test")
+//    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+//    implementation("io.projectreactor.kotlin:reactor-kotlin-extensions")
+    implementation(kotlin("stdlib-jdk8"))
+
+}
+
+dependencyManagement {
+    imports {
+        mavenBom("org.springframework.cloud:spring-cloud-dependencies:${property("springCloudVersion")}")
+    }
+}
+
+tasks.withType<KotlinCompile> {
+    kotlinOptions {
+        freeCompilerArgs += "-Xjsr305=strict"
+        jvmTarget = "17"
+    }
+}
+
+
+tasks.withType<Test> {
+    enabled = false
+    useJUnitPlatform()
+}
+
+tasks.withType<Jar> {
+
+    // specify JAR file name
+    archiveBaseName.set("ReverseProxy")
+    archiveVersion.set("0.0.1-SNAPSHOT")
+
+    // ensure that both compiled classes and resources are included in the JAR file
+    from(sourceSets.main.get().output)
+    sourceSets.main.configure {
+        resources.srcDirs("src/main/").includes.addAll(arrayOf("**/*.*"))
+    }
+
+    // include dependencies in the JAR file
+    dependsOn(configurations.runtimeClasspath)
+    from({
+        configurations.runtimeClasspath.get()
+            .filter { it.name.endsWith("jar") }
+            .map { zipTree(it) }
+    })
+
+    // specify location of main class
+    manifest {
+        attributes["Main-Class"] = "com.example.reverseproxy.ReverseProxyApplicationKt"
+    }
+
+    // define duplicate strategy
+    duplicatesStrategy = DuplicatesStrategy.EXCLUDE
+
+    // exclude specific signed files from being included in the final JAR
+    exclude("META-INF/*.SF")
+    exclude("META-INF/*.DSA")
+    exclude("META-INF/*.RSA")
+}
+
+tasks.named<ProcessResources>("processResources") {
+    duplicatesStrategy = DuplicatesStrategy.EXCLUDE
+}
+
+tasks.named("bootJar") {
+    dependsOn("jar")
+}
+tasks.named("bootJar") {
+    mustRunAfter("jar")
+}
+tasks.named("bootDistZip") {
+    dependsOn("jar")
+}
+tasks.named("bootDistZip") {
+    mustRunAfter("jar")
+}
+tasks.named("bootDistTar") {
+    dependsOn("jar")
+}
+tasks.named("bootDistTar") {
+    mustRunAfter("jar")
+}
+tasks.named("startScripts") {
+    dependsOn("bootJar")
+}
+tasks.named("startScripts") {
+    mustRunAfter("bootJar")
+}

Spring BFF/ReverseProxy/gradle/wrapper/gradle-wrapper.properties

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.8-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

Spring BFF/ReverseProxy/settings.gradle.kts

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+rootProject.name = "ReverseProxy"

Spring BFF/ReverseProxy/src/main/kotlin/com/example/reverseproxy/ReverseProxyApplication.kt

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+package com.example.reverseproxy
+
+import org.springframework.boot.autoconfigure.SpringBootApplication
+import org.springframework.boot.runApplication
+
+@SpringBootApplication
+class ReverseProxyApplication
+
+    fun main(args: Array<String>) {
+        runApplication<ReverseProxyApplication>(*args)
+
+}

Spring BFF/ReverseProxy/src/main/resources/META-INF/MANIFEST.MF

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+Manifest-Version: 1.0
+Main-Class: com.example.reverseproxy.ReverseProxyApplicationKt
+

Spring BFF/ReverseProxy/src/main/resources/application.properties

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+# spring application name
+spring.application.name=ReverseProxy

Spring BFF/ReverseProxy/src/main/resources/application.yaml

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+# Custom properties to ease configuration overrides
+# on command-line or IDE launch configurations
+# more here:
+# https://github.com/eugenp/tutorials/blob/master/spring-security-modules/spring-security-oauth2-bff/backend/reverse-proxy/src/main/resources/application.yml
+
+#**********************************************************************************************************************#
+#***************************************************** VARIABLES ******************************************************#
+#**********************************************************************************************************************#
+
+# server settings
+scheme: http
+hostname: localhost
+
+#reverse proxy
+reverse-proxy-port: 7080
+
+# bff server
+bff-port: 9090
+bff-prefix: /bff
+bff-server-uri: ${scheme}://${hostname}:${bff-port}
+
+# angular ui server
+angular-port: 4200
+angular-prefix: /angular-ui
+# update scheme if you enable SSL in angular.json
+angular-server-uri: ${scheme}://${hostname}:${angular-port}${angular-prefix}
+
+#**********************************************************************************************************************#
+#************************************************** SPRING SETTINGS ***************************************************#
+#**********************************************************************************************************************#
+
+## spring settings
+spring:
+  # profile settings
+  profiles:
+    active: ssl
+  # cloud gateway settings
+  cloud:
+    gateway:
+      default-filters:
+        - DedupeResponseHeader=Access-Control-Allow-Credentials Access-Control-Allow-Origin
+      routes:
+        # SPAs assets
+        - id: angular-ui
+          uri: ${angular-server-uri}
+          predicates:
+            - Path=${angular-prefix}/**
+
+        # BFF-server
+        - id: bff
+          uri: ${bff-server-uri}
+          predicates:
+            - Path=${bff-prefix}/**
+          filters:
+            - StripPrefix=1
+
+#**********************************************************************************************************************#
+#************************************************** SERVER SETTINGS ***************************************************#
+#**********************************************************************************************************************#
+
+# current server settings
+server:
+  port: ${reverse-proxy-port}
+  ssl:
+    enabled: false
+
+#**********************************************************************************************************************#
+#************************************************* PROFILE SETTINGS ***************************************************#
+#**********************************************************************************************************************#
+
+# spring profile settings
+---
+spring:
+  config:
+    activate:
+      on-profile: ssl
+server:
+  ssl:
+    enabled: false
+#    key-store: classpath:proxyapp-keystore.p12
+#    key-store-password: tASH@Lc;5db{9q`z/64mCkX&]D~naUx=!B(>ZJT}
+#    key-store-type: PKCS12
+#    key-alias: proxyapp
+scheme: http
+
+#**********************************************************************************************************************#
+#*********************************************** MANAGEMENT SETTINGS **************************************************#
+#**********************************************************************************************************************#
+
+# endpoint settings
+management:
+  endpoint:
+    health:
+      probes:
+        enabled: true
+  endpoints:
+    web:
+      exposure:
+        include: health,info
+  health:
+    livenessstate:
+      enabled: true
+    readinessstate:
+      enabled: true
+
+#**********************************************************************************************************************#
+#************************************************ LOGGING SETTINGS ****************************************************#
+#**********************************************************************************************************************#
+
+# logging configurations
+logging:
+  level:
+    root: INFO
+    org:
+      springframework:
+        boot: INFO
+        web: INFO
+        cloud:
+          gateway: DEBUG
+
+#**********************************************************************************************************************#
+#************************************************** END OF YAML *******************************************************#
+#**********************************************************************************************************************#