chore: add licenses

Author: Lyokone

.github/workflows/test.yml

@@ -12,6 +12,38 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
+  # Check license headers on all source files
+  check-license-header:
+    name: Check License Headers
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Download addlicense
+        run: |
+          curl -sL https://github.com/google/addlicense/releases/download/v1.2.0/addlicense_v1.2.0_Linux_x86_64.tar.gz | tar xz -C /usr/local/bin addlicense
+          chmod +x /usr/local/bin/addlicense
+
+      - name: Check license headers
+        run: |
+          addlicense -f header_template.txt \
+            --check \
+            --ignore "**/*.yml" \
+            --ignore "**/*.yaml" \
+            --ignore "**/*.xml" \
+            --ignore "**/*.g.dart" \
+            --ignore "**/*.sh" \
+            --ignore "**/*.html" \
+            --ignore "**/*.js" \
+            --ignore "**/*.ts" \
+            --ignore "**/*.txt" \
+            --ignore "**/.dart_tool/**" \
+            --ignore "**/test/fixtures/nodejs_reference/**" \
+            --ignore "**/test/fixtures/with_options_nodejs/**" \
+            .
+
   # Dart package analysis and formatting
   lint-analyze:
     name: Format & Analyze (${{ matrix.sdk }})
@@ -270,12 +302,16 @@ jobs:
   test-summary:
     name: Test Summary
     runs-on: ubuntu-latest
-    needs: [lint-analyze, builder-tests, snapshot-tests, e2e-tests]
+    needs: [check-license-header, lint-analyze, builder-tests, snapshot-tests, e2e-tests]
     if: always()
 
     steps:
       - name: Check test results
         run: |
+          if [ "${{ needs.check-license-header.result }}" != "success" ]; then
+            echo "❌ License header check failed"
+            exit 1
+          fi
           if [ "${{ needs.lint-analyze.result }}" != "success" ]; then
             echo "❌ Format & Analyze failed"
             exit 1

CONTRIBUTING.md

@@ -99,6 +99,47 @@ dart format .
 dart analyze --fatal-infos
 ```
 
+### License Headers
+
+All source files must include a license header. The project uses [addlicense](https://github.com/google/addlicense) to manage this automatically.
+
+**Install addlicense:**
+
+Download the binary for your platform from the [v1.2.0 release](https://github.com/google/addlicense/releases/tag/v1.2.0) and place it on your `PATH`. For example, on macOS ARM64:
+
+```bash
+curl -sL https://github.com/google/addlicense/releases/download/v1.2.0/addlicense_v1.2.0_macOS_arm64.tar.gz | tar xz
+sudo mv addlicense /usr/local/bin/
+```
+
+**Add headers to new files:**
+
+```bash
+addlicense -f header_template.txt \
+  --ignore "**/*.yml" --ignore "**/*.yaml" --ignore "**/*.xml" \
+  --ignore "**/*.g.dart" --ignore "**/*.sh" --ignore "**/*.html" \
+  --ignore "**/*.js" --ignore "**/*.ts" --ignore "**/*.txt" \
+  --ignore "**/.dart_tool/**" \
+  --ignore "**/test/fixtures/nodejs_reference/**" \
+  --ignore "**/test/fixtures/with_options_nodejs/**" \
+  .
+```
+
+**Check headers (dry run, same as CI):**
+
+```bash
+addlicense -f header_template.txt --check \
+  --ignore "**/*.yml" --ignore "**/*.yaml" --ignore "**/*.xml" \
+  --ignore "**/*.g.dart" --ignore "**/*.sh" --ignore "**/*.html" \
+  --ignore "**/*.js" --ignore "**/*.ts" --ignore "**/*.txt" \
+  --ignore "**/.dart_tool/**" \
+  --ignore "**/test/fixtures/nodejs_reference/**" \
+  --ignore "**/test/fixtures/with_options_nodejs/**" \
+  .
+```
+
+CI will fail if any source file is missing its license header.
+
 ### Local Validation
 
 You can run the full CI check suite locally before pushing:
@@ -175,4 +216,4 @@ See `.github/workflows/README.md` for full details on each job and how to debug
 
 ## License
 
-By contributing, you agree that your contributions will be licensed under the [Apache 2.0 License](https://www.apache.org/licenses/LICENSE-2.0).
+By contributing, you agree that your contributions will be licensed under the [MIT License](LICENSE).

LICENSE

@@ -0,0 +1,10 @@
+The MIT License (MIT)
+
+Copyright (c) 2026 Firebase
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:

example/alerts/bin/server.dart

@@ -1,3 +1,7 @@
+// Copyright 2026, the Firebase project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// MIT-style license that can be found in the LICENSE file.
+
 import 'package:firebase_functions/firebase_functions.dart';
 
 void main(List<String> args) async {

example/auth/bin/server.dart

@@ -1,3 +1,7 @@
+// Copyright 2026, the Firebase project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// MIT-style license that can be found in the LICENSE file.
+
 import 'package:firebase_functions/firebase_functions.dart';
 
 void main(List<String> args) async {

example/database/bin/server.dart

@@ -1,3 +1,7 @@
+// Copyright 2026, the Firebase project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// MIT-style license that can be found in the LICENSE file.
+
 import 'package:firebase_functions/firebase_functions.dart';
 
 void main(List<String> args) async {

example/eventarc/bin/server.dart

@@ -1,3 +1,7 @@
+// Copyright 2026, the Firebase project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// MIT-style license that can be found in the LICENSE file.
+
 import 'package:firebase_functions/firebase_functions.dart';
 
 void main(List<String> args) async {

example/firestore/bin/server.dart

@@ -1,3 +1,7 @@
+// Copyright 2026, the Firebase project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// MIT-style license that can be found in the LICENSE file.
+
 import 'package:firebase_functions/firebase_functions.dart';
 
 void main(List<String> args) async {

example/firestore_test/bin/server.dart

@@ -1,3 +1,7 @@
+// Copyright 2026, the Firebase project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// MIT-style license that can be found in the LICENSE file.
+
 import 'package:firebase_functions/firebase_functions.dart';
 
 void main(List<String> args) async {

example/firestore_test/test/e2e/firestore_triggers_test.dart

@@ -1,3 +1,7 @@
+// Copyright 2026, the Firebase project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// MIT-style license that can be found in the LICENSE file.
+
 import 'dart:convert';
 import 'dart:io';