Initial commit with GitLab CI/CD pipeline

.dockerignore

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+# Git
+.git/
+.gitignore
+.gitattributes
+
+# CI/CD
+.gitlab-ci.yml
+
+# Environment files (never include in image)
+.env
+.env.*
+!.env.example
+
+# Documentation
+README.md
+*.md
+docs/
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Logs
+*.log
+logs/
+
+# Test files (optional - include if you want tests in image)
+*.test.ts
+**/*.test.ts
+
+# Build artifacts
+*.tar
+image.tar
+
+# Deno cache (will be regenerated in container)
+.deno/
+
+# JetBrains
+deep-lite.iml
+
+# Claude Code plans
+.claude/

.env.example

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+# DeepL API Configuration
+DEEPL_AUTH_KEY=your-deepl-api-key-here
+
+# Bearer Token for API Authentication
+# Generate a secure random token (e.g., using: openssl rand -hex 32)
+BEARER_TOKEN=your-secure-bearer-token-here
+
+# Server Port (optional, defaults to 8000)
+PORT=8000

.gitignore

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+# Environment variables
+.env
+.env.local
+
+# Deno
+.deno/
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Logs
+*.log
+logs/

.gitlab-ci.yml

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+stages:
+  - validate
+  - sonar
+  - test
+  - build
+
+variables:
+  DENO_VERSION: "2.6.4"
+  DOCKER_IMAGE_NAME: "$CI_REGISTRY/deeplite"
+  PORT: "8000"
+
+# Global template for Deno jobs
+.deno_template:
+  image: denoland/deno:${DENO_VERSION}
+  before_script:
+    - deno --version
+
+# ===== VALIDATION STAGE =====
+
+fmt:check:
+  extends: .deno_template
+  stage: validate
+  script:
+    - deno fmt --check
+  rules:
+    - if: '$CI_PIPELINE_SOURCE == "merge_request_event"'
+    - if: "$CI_COMMIT_BRANCH"
+
+lint:check:
+  extends: .deno_template
+  stage: validate
+  script:
+    - deno lint
+  rules:
+    - if: '$CI_PIPELINE_SOURCE == "merge_request_event"'
+    - if: "$CI_COMMIT_BRANCH"
+
+type:check:
+  extends: .deno_template
+  stage: validate
+  script:
+    - deno check src/main.ts
+    - deno check src/main.test.ts
+  rules:
+    - if: '$CI_PIPELINE_SOURCE == "merge_request_event"'
+    - if: "$CI_COMMIT_BRANCH"
+
+# ===== SONARQUBE STAGE =====
+
+sonarqube:scan:
+  stage: sonar
+  image:
+    name: sonarsource/sonar-scanner-cli:latest
+    entrypoint: [""]
+  variables:
+    SONAR_USER_HOME: "${CI_PROJECT_DIR}/.sonar"
+    GIT_DEPTH: "0"
+  cache:
+    key: "${CI_JOB_NAME}"
+    paths:
+      - .sonar/cache
+  script:
+    - |
+        sonar-scanner \
+          -Dsonar.host.url="${SONAR_HOST}" \
+          -Dsonar.token="${SONAR_TOKEN}" \
+          -Dsonar.projectKey="${CI_PROJECT_PATH_SLUG}" \
+          -Dsonar.projectName="${CI_PROJECT_NAME}" \
+          -Dsonar.projectVersion="${CI_COMMIT_SHORT_SHA}" \
+          -Dsonar.sources=src \
+          -Dsonar.sourceEncoding=UTF-8 \
+          -Dsonar.language=ts \
+          -Dsonar.exclusions="**/*.test.ts,**/test/**" \
+          -Dsonar.tests=src \
+          -Dsonar.test.inclusions="**/*.test.ts"
+  allow_failure: true
+  rules:
+    - if: '$CI_PIPELINE_SOURCE == "merge_request_event"'
+    - if: "$CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH"
+  dependencies: []
+
+# ===== TEST STAGE =====
+
+integration:test:
+  extends: .deno_template
+  stage: test
+  variables:
+    DEEPL_AUTH_KEY: "${DEEPL_AUTH_KEY}"
+    BEARER_TOKEN: "${BEARER_TOKEN}"
+    PORT: "8000"
+  script:
+    # Start server in background
+    - echo "Starting server in background..."
+    - deno run --allow-net --allow-env src/main.ts &
+    - SERVER_PID=$!
+    - echo "Server started with PID $SERVER_PID"
+
+    # Wait for server to be ready (poll health endpoint)
+    - echo "Waiting for server to be ready..."
+    - |
+        deno eval "
+          for (let i = 1; i <= 30; i++) {
+            try {
+              await fetch('http://localhost:8000/health');
+              console.log('Server is ready!');
+              Deno.exit(0);
+            } catch {
+              console.log('Waiting for server... attempt ' + i + '/30');
+              await new Promise(r => setTimeout(r, 1000));
+            }
+          }
+          console.log('Server health check failed');
+          Deno.exit(1);
+        "
+
+    # Run tests
+    - echo "Running integration tests..."
+    - deno test --allow-net --allow-env src/main.test.ts
+
+    # Cleanup: Kill the server
+    - echo "Stopping server..."
+    - kill $SERVER_PID || true
+    - wait $SERVER_PID || true
+  rules:
+    - if: '$CI_PIPELINE_SOURCE == "merge_request_event"'
+    - if: "$CI_COMMIT_BRANCH"
+  retry:
+    max: 2
+    when:
+      - runner_system_failure
+      - stuck_or_timeout_failure
+
+# ===== BUILD & PUSH STAGE (Tags only) =====
+
+docker:build-push:
+  stage: build
+  image: docker:29-dind
+  services:
+    - docker:29-dind
+  variables:
+    DOCKER_TLS_CERTDIR: "/certs"
+  before_script:
+    - docker info
+    - echo "$CI_REGISTRY_PASSWORD" | docker login -u "$CI_REGISTRY_USER" --password-stdin "$CI_REGISTRY"
+  script:
+    - export VERSION=${CI_COMMIT_TAG#v}
+    - echo "Building and pushing Docker image version $VERSION"
+
+    - |
+        docker build \
+          --build-arg DENO_VERSION=${DENO_VERSION} \
+          --tag ${DOCKER_IMAGE_NAME}:${VERSION} \
+          --tag ${DOCKER_IMAGE_NAME}:${CI_COMMIT_SHA} \
+          --tag ${DOCKER_IMAGE_NAME}:latest \
+          .
+
+    - docker push ${DOCKER_IMAGE_NAME}:${VERSION}
+    - docker push ${DOCKER_IMAGE_NAME}:${CI_COMMIT_SHA}
+    - docker push ${DOCKER_IMAGE_NAME}:latest
+
+    - echo "Successfully pushed:"
+    - echo "  - ${DOCKER_IMAGE_NAME}:${VERSION}"
+    - echo "  - ${DOCKER_IMAGE_NAME}:${CI_COMMIT_SHA}"
+    - echo "  - ${DOCKER_IMAGE_NAME}:latest"
+  rules:
+    - if: '$CI_COMMIT_TAG =~ /^v\d+\.\d+\.\d+$/'
+  retry:
+    max: 2
+    when:
+      - runner_system_failure

Dockerfile

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+# Use official Deno runtime as base image
+ARG DENO_VERSION=2.6.4
+FROM denoland/deno:${DENO_VERSION}
+
+# Set working directory
+WORKDIR /app
+
+# Copy dependency manifest first (better layer caching)
+COPY deno.json deno.lock ./
+
+# Copy source code
+COPY src/ ./src/
+
+# Cache dependencies by checking the main file
+# This downloads and caches all imports
+RUN deno cache src/main.ts
+
+# Expose port (default: 8000)
+EXPOSE 8000
+
+# Create non-root user for security
+RUN useradd -m -u 1001 denouser && \
+    chown -R denouser:denouser /app
+
+USER denouser
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+  CMD deno eval "fetch('http://localhost:8000/health').then(r => r.ok ? Deno.exit(0) : Deno.exit(1))" || exit 1
+
+# Run the application
+CMD ["deno", "run", "--allow-net", "--allow-env", "src/main.ts"]

README.md

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+# DeepLite BFF Server
+
+Backend-for-Frontend proxy server for the DeepLite PWA.
+
+## Configuration
+
+Create a `.env` file:
+
+```env
+DEEPL_AUTH_KEY=your-deepl-api-key
+BEARER_TOKEN=your-secure-token
+PORT=8000
+```
+
+## API Endpoints
+
+### POST /translate
+
+Translates text using the DeepL API.
+
+```bash
+curl -X POST http://localhost:8000/translate \
+  -H "Authorization: Bearer YOUR_BEARER_TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{"text": "Hello world!", "target_lang": "FR"}'
+```
+
+**Parameters:**
+
+- `text` (required): Text to translate
+- `target_lang` (required): Target language code (e.g., "FR", "DE", "ES")
+- `source_lang` (optional): Source language code (auto-detected if not provided)
+
+### GET /languages
+
+Retrieves the list of supported languages.
+
+```bash
+curl http://localhost:8000/languages \
+  -H "Authorization: Bearer YOUR_BEARER_TOKEN"
+```
+
+### GET /health
+
+Health check endpoint (no authentication required).
+
+```bash
+curl http://localhost:8000/health
+```

deep-lite.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="GENERAL_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

deno.json

@@ -0,0 +1,24 @@
+{
+  "tasks": {
+    "dev": "deno run --allow-net --allow-env --watch src/main.ts",
+    "start": "deno run --allow-net --allow-env src/main.ts",
+    "test": "deno test --allow-net --allow-env src/main.test.ts"
+  },
+  "fmt": {
+    "useTabs": false,
+    "lineWidth": 100,
+    "indentWidth": 2,
+    "semiColons": true,
+    "singleQuote": false,
+    "proseWrap": "preserve"
+  },
+  "lint": {
+    "rules": {
+      "tags": ["recommended"]
+    }
+  },
+  "compilerOptions": {
+    "lib": ["deno.window"],
+    "strict": true
+  }
+}

deno.lock

@@ -0,0 +1,191 @@
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+    "https://deno.land/x/oak@v12.6.1/router.ts": "0f53d6249f9e8f89f2522b2b810b9302d0f22593c184b16b24b03bf2b7d42ea1",
+    "https://deno.land/x/oak@v12.6.1/send.ts": "5ec49f106294593f468317a0c885da4f3274bf6d0fe9e16a7304391730b4f4fb",
+    "https://deno.land/x/oak@v12.6.1/structured_clone.ts": "c3888b14d1eec558345bfbf13d0993d59bd45aaa8588444e35dd558c3a921cd8",
+    "https://deno.land/x/oak@v12.6.1/testing.ts": "37d684d57bb8e5150fb5eb2677e66b04dcb422709cf2c5a74c1df94d52aa02e2",
+    "https://deno.land/x/oak@v12.6.1/util.ts": "0a3fdffb114859c2de84e1783efa3a544af4d2af8c6f08e0d25655de9d3e69bb",
+    "https://deno.land/x/path_to_regexp@v6.2.1/index.ts": "894060567837bae8fc9c5cbd4d0a05e9024672083d5883b525c031eea940e556"
+  }
+}

sonar-project.properties

@@ -0,0 +1,21 @@
+# Project identification
+sonar.projectKey=${env.CI_PROJECT_PATH_SLUG}
+sonar.projectName=${env.CI_PROJECT_NAME}
+sonar.projectVersion=${env.CI_COMMIT_SHORT_SHA}
+
+# Source code
+sonar.sources=src
+sonar.sourceEncoding=UTF-8
+
+# Language
+sonar.language=ts
+
+# Exclusions
+sonar.exclusions=**/*.test.ts,**/test/**,**/*.config.*
+
+# Test files
+sonar.tests=src
+sonar.test.inclusions=**/*.test.ts
+
+# Coverage (if you add coverage in the future)
+# sonar.javascript.lcov.reportPaths=coverage/lcov.info

src/main.test.ts

@@ -0,0 +1,64 @@
+import { assertEquals, assertExists } from "https://deno.land/std@0.208.0/assert/mod.ts";
+
+// Test configuration
+const BASE_URL = "http://localhost:8000";
+const VALID_TOKEN = Deno.env.get("BEARER_TOKEN") || "token";
+
+Deno.test({
+  name: "Authentication - should reject invalid or missing tokens",
+  async fn() {
+    // Test missing token
+    const noTokenResponse = await fetch(`${BASE_URL}/languages`);
+    const noTokenData = await noTokenResponse.json();
+
+    assertEquals(noTokenResponse.status, 401);
+    assertEquals(noTokenData.error, "Missing or invalid Authorization header");
+
+    // Test invalid token
+    const invalidTokenResponse = await fetch(`${BASE_URL}/languages`, {
+      headers: { "Authorization": "Bearer wrong-token" },
+    });
+    const invalidTokenData = await invalidTokenResponse.json();
+
+    assertEquals(invalidTokenResponse.status, 403);
+    assertEquals(invalidTokenData.error, "Invalid bearer token");
+
+    // Test valid token works
+    const validTokenResponse = await fetch(`${BASE_URL}/languages`, {
+      headers: { "Authorization": `Bearer ${VALID_TOKEN}` },
+    });
+    await validTokenResponse.json(); // Consume the response body
+
+    assertEquals(validTokenResponse.status, 200);
+  },
+});
+
+Deno.test({
+  name: "Translation - should translate text with exclamation mark",
+  async fn() {
+    const response = await fetch(`${BASE_URL}/translate`, {
+      method: "POST",
+      headers: {
+        "Authorization": `Bearer ${VALID_TOKEN}`,
+        "Content-Type": "application/json",
+      },
+      body: JSON.stringify({
+        text: "Hello world!",
+        target_lang: "FR",
+      }),
+    });
+    const data = await response.json();
+
+    assertEquals(response.status, 200);
+    assertExists(data.translations);
+    assertEquals(Array.isArray(data.translations), true);
+    assertEquals(data.translations.length, 1);
+    assertExists(data.translations[0].text);
+    assertExists(data.translations[0].detected_source_language);
+
+    // Verify the translation contains French text
+    const translatedText = data.translations[0].text;
+    assertEquals(typeof translatedText, "string");
+    assertEquals(translatedText.length > 0, true);
+  },
+});

src/main.ts

@@ -0,0 +1,141 @@
+import { Application, Router } from "https://deno.land/x/oak@v12.6.1/mod.ts";
+import { oakCors } from "https://deno.land/x/cors@v1.2.2/mod.ts";
+
+const DEEPL_API_KEY = Deno.env.get("DEEPL_AUTH_KEY");
+const BEARER_TOKEN = Deno.env.get("BEARER_TOKEN");
+const PORT = parseInt(Deno.env.get("PORT") || "8000");
+const DEEPL_API_BASE = "https://api-free.deepl.com/v2";
+const FRONTEND_URL = "https://deep-lite.netlify.app";
+
+if (!DEEPL_API_KEY) {
+  console.error("ERROR: DEEPL_AUTH_KEY environment variable is required");
+  Deno.exit(1);
+}
+
+if (!BEARER_TOKEN) {
+  console.error("ERROR: BEARER_TOKEN environment variable is required");
+  Deno.exit(1);
+}
+
+const app = new Application();
+const router = new Router();
+
+// CORS middleware - only allow requests from the PWA frontend
+app.use(
+  oakCors({
+    origin: FRONTEND_URL,
+    credentials: true,
+  }),
+);
+
+// Bearer token authentication middleware (skip /health endpoint)
+app.use(async (ctx, next) => {
+  // Skip authentication for health check
+  if (ctx.request.url.pathname === "/health") {
+    await next();
+    return;
+  }
+
+  const authHeader = ctx.request.headers.get("Authorization");
+
+  if (!authHeader || !authHeader.startsWith("Bearer ")) {
+    ctx.response.status = 401;
+    ctx.response.body = { error: "Missing or invalid Authorization header" };
+    return;
+  }
+
+  const token = authHeader.substring(7); // Remove "Bearer " prefix
+
+  if (token !== BEARER_TOKEN) {
+    ctx.response.status = 403;
+    ctx.response.body = { error: "Invalid bearer token" };
+    return;
+  }
+
+  await next();
+});
+
+// POST /translate - Proxy to DeepL translate endpoint
+router.post("/translate", async (ctx) => {
+  try {
+    const body = await ctx.request.body({ type: "json" }).value;
+
+    if (!body.text || !body.target_lang) {
+      ctx.response.status = 400;
+      ctx.response.body = { error: "Missing required fields: text, target_lang" };
+      return;
+    }
+
+    // Build form data for DeepL API
+    const formData = new URLSearchParams();
+    formData.append("text", body.text);
+    formData.append("target_lang", body.target_lang);
+
+    if (body.source_lang) {
+      formData.append("source_lang", body.source_lang);
+    }
+
+    const response = await fetch(`${DEEPL_API_BASE}/translate`, {
+      method: "POST",
+      headers: {
+        "Authorization": `DeepL-Auth-Key ${DEEPL_API_KEY}`,
+        "Content-Type": "application/x-www-form-urlencoded",
+      },
+      body: formData.toString(),
+    });
+
+    const data = await response.json();
+
+    if (!response.ok) {
+      ctx.response.status = response.status;
+      ctx.response.body = data;
+      return;
+    }
+
+    ctx.response.body = data;
+  } catch (error) {
+    console.error("Translation error:", error);
+    ctx.response.status = 500;
+    ctx.response.body = { error: "Internal server error" };
+  }
+});
+
+// GET /languages - Proxy to DeepL languages endpoint
+router.get("/languages", async (ctx) => {
+  try {
+    const response = await fetch(`${DEEPL_API_BASE}/languages`, {
+      method: "GET",
+      headers: {
+        "Authorization": `DeepL-Auth-Key ${DEEPL_API_KEY}`,
+      },
+    });
+
+    const data = await response.json();
+
+    if (!response.ok) {
+      ctx.response.status = response.status;
+      ctx.response.body = data;
+      return;
+    }
+
+    ctx.response.body = data;
+  } catch (error) {
+    console.error("Languages error:", error);
+    ctx.response.status = 500;
+    ctx.response.body = { error: "Internal server error" };
+  }
+});
+
+// Health check endpoint
+router.get("/health", (ctx) => {
+  ctx.response.body = { status: "ok", timestamp: new Date().toISOString() };
+});
+
+app.use(router.routes());
+app.use(router.allowedMethods());
+
+console.log(`🚀 DeepLite BFF server running on http://localhost:${PORT}`);
+console.log(`📝 CORS enabled for: ${FRONTEND_URL}`);
+console.log(`🔒 Bearer token authentication enabled`);
+
+await app.listen({ port: PORT });