openproject_gitea_plugin/README.md

# OpenProject Gitea Integration

An OpenProject module that integrates [Gitea](https://gitea.com) pull requests with OpenProject work packages — following the same patterns as the bundled GitHub and GitLab integrations.

## Overview

When a pull request in Gitea references an OpenProject work package (via a URL or `OP#<id>`), this plugin:

- Records the pull request in OpenProject and links it to the work package
- Posts automated journal comments on the work package when the PR is opened, merged, closed, or reopened
- Shows a **Gitea** tab on the work package split-view listing all linked pull requests with their state and labels
- Reacts to PR comments that mention a work package

## Supported webhook events

| Gitea event | Effect in OpenProject |
|---|---|
| `pull_request` — opened | Links PR to work package; posts "PR Opened" comment |
| `pull_request` — closed (not merged) | Updates PR state; posts "PR Closed" comment |
| `pull_request` — closed (merged) | Updates PR state to merged; posts "PR Merged" comment |
| `pull_request` — reopened | Updates PR state; posts "PR Reopened" comment |
| `pull_request` — edited / synchronized | Updates the stored PR record (no comment) |
| `issue_comment` — created | Posts a comment on any work package referenced in the comment body |

## Referencing work packages

In a pull request title, description, or comment, reference a work package using:

- Its semantic ID: `KS-10`, `PROJ-42` — matched automatically, no prefix needed
- A prefixed numeric ID: `OP#42` — prefix required to avoid collision with Gitea issue numbers
- A full OpenProject URL: `https://openproject.example.com/work_packages/42`

Multiple references in the same text are all picked up.

## Requirements

- OpenProject ≥ 13
- Ruby 3.4+
- The `openproject-webhooks` gem (bundled with OpenProject)

## Installation

### Packaged (DEB/RPM) installation

Create a custom Gemfile (e.g. `/etc/openproject/Gemfile.custom`):

```ruby
group :opf_plugins do
  gem 'openproject-gitea_integration', '~> 1.0'
end
```

Tell OpenProject to use it and trigger a recompile of frontend assets:

```shell
openproject config:set CUSTOM_PLUGIN_GEMFILE=/etc/openproject/Gemfile.custom
openproject config:set RECOMPILE_ANGULAR_ASSETS=true
sudo openproject configure
```

### Docker / docker-compose installation

The official OpenProject Docker image bakes all gems and frontend assets in at
build time, so installing a third-party plugin requires building a custom image.

#### 1. Create a `Dockerfile` that extends the official image

```dockerfile
FROM openproject/openproject:15

# Switch to root to install build tools and re-bundle
USER root

# Copy the plugin into the modules directory
COPY --chown=app:app . /app/modules/gitea_integration

# Add the gem to a custom Gemfile that OpenProject will merge
RUN echo "group :opf_plugins do\n  gem 'openproject-gitea_integration', path: 'modules/gitea_integration'\nend" \
    > /app/Gemfile.plugins && \
    cd /app && \
    bundle install --without development test && \
    RAILS_ENV=production bundle exec rake \
      openproject:plugins:register_frontend \
      assets:precompile

USER app
```

#### 2. Build and reference the image in `docker-compose.yml`

```yaml
services:
  web:
    build:
      context: .        # directory containing your Dockerfile and the plugin source
      dockerfile: Dockerfile
    # … rest of your existing web service config
  worker:
    build:
      context: .
      dockerfile: Dockerfile
    # … rest of your existing worker service config
```

#### 3. Build and restart

```shell
docker compose build
docker compose up -d
docker compose exec web bundle exec rails db:migrate
```

> **Note:** Every time you update the plugin you need to rebuild the image
> (`docker compose build --no-cache`) and restart the stack.

### Manual / monorepo installation

1. Clone this repository next to your OpenProject checkout, or place it at `modules/gitea_integration/` inside the OpenProject source tree.

2. Add the gem to your `Gemfile.plugins` (or `Gemfile.modules`):

   ```ruby
   group :opf_plugins do
     # from RubyGems:
     gem 'openproject-gitea_integration', '~> 1.0'
     # or from a local path:
     # gem 'openproject-gitea_integration', path: 'modules/gitea_integration'
   end
   ```

3. Install dependencies:

   ```bash
   bundle install
   ```

4. Run the database migration:

   ```bash
   bundle exec rails db:migrate
   ```

5. Rebuild the frontend:

   ```bash
   cd frontend && npm ci && npm run build
   ```

## Configuration

### 1. Create a bot user in OpenProject

Create a dedicated OpenProject user that will post automated comments on work packages. Add this user to every project where you want the integration to be active, with a role that allows:

- Viewing work packages
- Adding work package comments

Generate an **API token** for this user:

1. Log in as the bot user.
2. Go to **My Account → Access Tokens**.
3. Click **Generate** in the API row and copy the token.

### 2. Configure the plugin in OpenProject

Go to **Administration → Integrations → Gitea** and set:

- **Gitea actor** — the bot user created above. When set, only webhook requests authenticated with this user's API token are accepted.
- **Webhook secret** — a shared secret used to verify the HMAC-SHA256 signature on incoming requests. Leaving this blank disables signature verification (not recommended).

### 3. Create a webhook in Gitea

In each Gitea repository (or at the organisation level), go to **Settings → Webhooks → Add Webhook → Gitea**.

| Field | Value |
|---|---|
| Target URL | `https://your-openproject.example.com/webhooks/gitea?key=<api_token>` |
| HTTP Method | POST |
| Content Type | `application/json` |
| Secret | The same value entered as the **Webhook secret** in OpenProject |
| Trigger | **Custom events** → check **Pull Request** and **Issue Comment** |

Replace `<api_token>` with the API token generated for the bot user.

> **Same-host installs:** If Gitea and OpenProject run on the same machine you may need to allow local network requests in Gitea's configuration (`[webhook] ALLOWED_HOST_LIST`).

### 4. Enable the Gitea module per project

In each OpenProject project go to **Project Settings → Modules** and enable the **Gitea** module. This makes the Gitea tab visible on work packages.

## How it works

```
Gitea  ──webhook──▶  /webhooks/gitea?key=<token>
                           │
                     HookHandler
                     • verifies HMAC-SHA256 signature
                     • checks user matches configured bot
                     • dispatches OpenProject::Notifications event
                           │
              ┌────────────┴────────────┐
              ▼                         ▼
    NotificationHandler         NotificationHandler
      ::PullRequest               ::IssueComment
              │
    UpsertPullRequest / UpsertGiteaUser
              │
    work_package.gitea_pull_requests (HABTM)
              │
    WorkPackages::UpdateService  (posts journal comment)
```

The work package split-view tab fetches linked pull requests via:

```
GET /api/v3/work_packages/:id/gitea_pull_requests
```

## Development

Run the OpenProject test suite against this module:

```bash
bundle exec rspec modules/gitea_integration/spec
```

Lint Ruby:

```bash
bundle exec rubocop modules/gitea_integration
```

Lint TypeScript:

```bash
cd frontend && npx eslint src/
```

## License

GNU General Public License v3 — see [LICENSE](../../LICENSE).