introduce graphql-over-http spec compliance tests (#1715)

### 📝 Description

Verifies [`graphql-over-http` spec](https://github.com/graphql/graphql-over-http) compliance for GraphQL Kotlin Ktor and Spring servers.

### 🔗 Related Issues

Related: #1602
Related: #1573

Author: dariuszkuc

.github/workflows/continuous-integration.yml

@@ -24,6 +24,10 @@ jobs:
     needs: build-libraries
     uses: ./.github/workflows/federation-integration.yml
 
+  http-spec-compliance:
+    needs: build-libraries
+    uses: ./.github/workflows/http-spec-compliance.yml
+
   release-notes:
     timeout-minutes: 10
     runs-on: ubuntu-latest

.github/workflows/http-spec-compliance.yml

@@ -0,0 +1,79 @@
+name: GraphQL over HTTP spec server compliance
+
+on:
+  workflow_call:
+  pull_request:
+    branches:
+      - master
+    paths:
+      - 'servers/**'
+      - 'integration/graphql-http-spec/**'
+
+jobs:
+  http-spec-compliance:
+    timeout-minutes: 20
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: integration/graphql-http-spec
+    strategy:
+      matrix:
+        server: ['spring-server', 'ktor-server']
+
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v3
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: 16
+
+      - name: Setup NPM cache
+        uses: actions/cache@v3
+        with:
+          path: ~/.npm
+          key: ${{ runner.os }}-node-${{ hashFiles('website/package-lock.json') }}
+          restore-keys: ${{ runner.os }}-node-
+
+      - name: Install node dependencies
+        run: npm install
+
+      - name: Validate Gradle wrapper
+        uses: gradle/wrapper-validation-action@v1
+
+      - name: Set up Java 17
+        uses: actions/setup-java@v3
+        with:
+          java-version: 17
+          distribution: 'zulu'
+
+      - name: Set up Gradle cache
+        uses: gradle/gradle-build-action@v2
+
+      - name: Start server
+        id: start_server
+        run: |
+          set -x
+          echo "building server"
+          ./gradlew :${server}:build
+
+          echo "starting server"
+          ./gradlew :${server}:run &
+          echo "SERVER_PID=$(echo $!)" >> $GITHUB_OUTPUT
+        env:
+          server: ${{ matrix.server }}
+
+      - name: Verify HTTP spec compliance
+        run: |
+          echo "verify server is up"
+          npm run healthcheck
+
+          echo "verify compliance"
+          npm run test
+
+      - name: Stop server
+        if: ${{ always() }}
+        run: |
+          echo "shutting down server"
+          kill -9 ${{ steps.start_server.outputs.SERVER_PID }}

integration/graphql-http-spec/.gitignore

@@ -0,0 +1,8 @@
+build/
+node_modules/
+
+# Ignore Gradle project-specific cache directory
+.gradle
+
+# Ignore Gradle build output directory
+build

integration/graphql-http-spec/.npmrc

@@ -0,0 +1 @@
+registry = "https://registry.npmjs.org"

integration/graphql-http-spec/.nvmrc

@@ -0,0 +1 @@
+17

integration/graphql-http-spec/build.gradle.kts

@@ -0,0 +1,20 @@
+import java.util.Properties
+
+allprojects {
+    repositories {
+        mavenCentral()
+        mavenLocal {
+            content {
+                includeGroup("com.expediagroup")
+            }
+        }
+    }
+
+    val properties = Properties()
+    properties.load(File(rootDir.parentFile.parent, "gradle.properties").inputStream())
+    for ((key, value) in properties) {
+        if (!project.ext.has(key.toString())) {
+            project.ext[key.toString()] = value
+        }
+    }
+}

integration/graphql-http-spec/buildSrc/build.gradle.kts

@@ -0,0 +1,13 @@
+plugins {
+    `kotlin-dsl`
+}
+
+repositories {
+    mavenCentral()
+    gradlePluginPortal()
+}
+
+dependencies {
+    implementation(libs.kotlin.gradle.api)
+    implementation(libs.kotlin.gradle.plugin)
+}

integration/graphql-http-spec/buildSrc/settings.gradle.kts

@@ -0,0 +1,7 @@
+dependencyResolutionManagement {
+    versionCatalogs {
+        create("libs") {
+            from(files("../../../gradle/libs.versions.toml"))
+        }
+    }
+}

integration/graphql-http-spec/buildSrc/src/main/kotlin/com.expediagroup.it-conventions.gradle.kts

@@ -0,0 +1,19 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+plugins {
+    kotlin("jvm")
+}
+
+tasks {
+    kotlin {
+        jvmToolchain(17)
+    }
+    val kotlinJvmVersion: String by project
+    withType<KotlinCompile> {
+        kotlinOptions {
+            // intellij gets confused without it
+            jvmTarget = kotlinJvmVersion
+            freeCompilerArgs = listOf("-Xjsr305=strict")
+        }
+    }
+}

integration/graphql-http-spec/gradle.properties

@@ -0,0 +1,6 @@
+group = com.expediagroup.http.spec
+
+org.gradle.jvmargs=-Xmx4g -XX:MaxMetaspaceSize=1g
+org.gradle.caching=true
+org.gradle.parallel=true
+

integration/graphql-http-spec/gradle/wrapper/gradle-wrapper.jar

@@ -0,0 +1,6 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.6-bin.zip
+networkTimeout=10000
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists