Metadata-Version: 2.4
Name: contentgrid-extension-helpers
Version: 0.0.8
Summary: Helper functions for contentgrid extensions.
Author-email: Ranec Belpaire <ranec.belpaire@xenit.eu>
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Project-URL: Homepage, https://github.com/xenit-eu/contentgrid-python-extension-helpers
Project-URL: Source, https://github.com/xenit-eu/contentgrid-python-extension-helpers
Classifier: Development Status :: 3 - Alpha
Classifier: Operating System :: OS Independent
Classifier: Programming Language :: Python :: 3
Requires-Python: >=3.5
Description-Content-Type: text/markdown
License-File: LICENSE
Requires-Dist: requests<3,>=2.20.0
Requires-Dist: uri-template<2
Requires-Dist: fastapi>=0.137.2
Requires-Dist: PyJWT>2
Requires-Dist: cryptography>45
Requires-Dist: contentgrid_hal_client>=0.1
Requires-Dist: contentgrid_application_client>=0.1
Requires-Dist: pydantic<3,>=2
Requires-Dist: pydantic-settings<3,>=2
Requires-Dist: sqlmodel<0.0.45,>=0.0.31
Requires-Dist: hyperlink>=21
Dynamic: license-file

# ContentGrid Extension Helpers

Reusable helpers for building ContentGrid extensions in Python with FastAPI.

## Features

- **Authentication**: OIDC/OAuth token verification and a `ContentGridUserDependency` for FastAPI routes.
- **ContentGrid clients**: factories for clients authenticated via the extension flow (on behalf of the user) or a service account.
- **Database**: SQLModel session factories for PostgreSQL and SQLite, plus a base repository.
- **Responses**: HAL / HAL-Forms response models and RFC 7807 problem responses.
- **Middleware & logging**: exception middleware and JSON logging (`setup_json_logging`).

## Installation

```bash
pip install contentgrid-extension-helpers
```

## Configuration

Settings are read from environment variables (case-insensitive). `.env` and `.env.secret` files in the working directory are also loaded. Values passed directly to a constructor take precedence over the environment.

### Authentication (`ContentGridUserDependency`)

| Variable | Default | Description |
|---|---|---|
| `EXTENSION_NAME` | *required* | Extension name as registered in ContentGrid (without the `contentgrid:extension:` prefix). Used to build the token audience. |
| `OAUTH_ISSUER` | *required* | Issuer of the extension tokens. Its `.well-known/oauth-authorization-server` config is used to fetch the JWKS. |
| `EXTENSION_AUTH_URL` | *required* | Token endpoint of the extensions realm. |
| `ALGORITHM` | `RS256` | Accepted JWT signing algorithm when none is passed explicitly. |
| `OIDC_ISSUER` / `AUDIENCE` | – | Fallbacks used by `decode_and_verify_token` when no issuer/audience is passed. |

### Extension flow client (`ContentGridExtensionFlowClientFactory`)

| Variable | Default | Description |
|---|---|---|
| `EXTENSION_CLIENT_NAME` | *required* | Client ID of the extension. |
| `EXTENSION_CLIENT_SECRET` | *required* | Client secret of the extension. |
| `EXTENSION_AUTH_URL` | `https://auth.sandbox.contentgrid.cloud/realms/extensions/protocol/openid-connect/token` | Token endpoint of the extensions realm. |
| `SYSTEM_EXCHANGE_URI` | `https://extensions.sandbox.contentgrid.cloud/authentication/system/token` | System token exchange endpoint. |
| `DELEGATED_EXCHANGE_URI` | `https://extensions.sandbox.contentgrid.cloud/authentication/delegated/token` | Delegated (on-behalf-of user) token exchange endpoint. |

### Service account client (`ContentGridServiceAccountFactory`)

| Variable | Default | Description |
|---|---|---|
| `CG_AUTH_URL` | *required* | Auth realm URL of the ContentGrid application. |
| `CG_CLIENT_NAME` | *required* | Service account client ID. |
| `CG_CLIENT_SECRET` | *required* | Service account client secret. |
| `CG_APP_URL` | – | Default application endpoint, used when no `origin` is given. |
| `CG_ALLOWED_DOMAINS` | – | JSON list of domains the client may connect to, e.g. `["app.contentgrid.cloud"]`. |

### Database

| Variable | Default | Description |
|---|---|---|
| `DEBUG` | `false` | Echo SQL statements. |
| `PG_HOST`, `PG_PORT`, `PG_USER`, `PG_PASSWD`, `PG_DBNAME` | *required for Postgres* | PostgreSQL connection settings. |
| `DB_POOL_SIZE` | `10` | Connection pool size. |
| `DB_MAX_OVERFLOW` | `20` | Extra connections allowed beyond the pool size. |
| `DB_POOL_RECYCLE` | `3600` | Seconds after which connections are recycled. |
| `DB_POOL_PRE_PING` | `true` | Test connections before use. |
| `SQLITE_FILE_NAME` | `database.db` | SQLite database file. |

### Server (`extension_config`)

| Variable | Default | Description |
|---|---|---|
| `SERVER_URL` | – | Public base URL of the extension. |
| `SERVER_HOST` | `""` | Host to bind to. |
| `SERVER_PORT` | – | Port to bind to. |
| `WEB_CONCURRENCY` | – | Number of worker processes. |
| `CORS_ORIGINS` | `[]` | JSON list of allowed CORS origins (applied when `PRODUCTION` is true). |
| `PRODUCTION` | `false` | Run in production mode. |
| `CI` | `false` | Indicates a CI environment. |

## Examples

### Authentication

```python
from fastapi import FastAPI, Depends
from contentgrid_extension_helpers.dependencies.authentication.user import ContentGridUserDependency
from contentgrid_extension_helpers.authentication.user import ContentGridUser

app = FastAPI()
current_user = ContentGridUserDependency()  # reads EXTENSION_NAME, OAUTH_ISSUER, ...

@app.get("/me")
def me(user: ContentGridUser = Depends(current_user)):
    return user
```

### HAL responses

Subclass `FastAPIHALResponse` for your resources and reference other endpoints **by function name** with `HALLinkFor` / `HALTemplateFor`. They are resolved to URLs from the app's routes during serialization. HAL-Forms templates get their properties from the endpoint's request body model.

```python
import uuid
from fastapi import FastAPI, HTTPException
from pydantic import BaseModel, Field
from contentgrid_extension_helpers.responses.hal import (
    FastAPIHALResponse, FastAPIHALCollection, HALLinkFor, HALTemplateFor,
)

app = FastAPI()
FastAPIHALResponse.init_app(app)                            # required: resolve links from this app's routes
FastAPIHALResponse.add_server_url("http://localhost:8000")  # optional: make links absolute

class BookCreate(BaseModel):
    title: str

class Book(FastAPIHALResponse):
    id: uuid.UUID = Field(default_factory=uuid.uuid4)
    title: str

    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        # path_params as a callable receives the instance at serialization time
        self.links = {
            "self": HALLinkFor(endpoint_function_name="get_book", path_params=lambda book: {"book_id": str(book.id)}),
            "collection": HALLinkFor(endpoint_function_name="list_books"),
        }

books: list[Book] = [Book(title="Dune")]

@app.get("/books", response_model=FastAPIHALCollection, response_model_exclude_none=True)
def list_books():
    return FastAPIHALCollection[Book](
        _links={"self": HALLinkFor(endpoint_function_name="list_books")},
        _embedded={"books": books},
        _templates={"create": HALTemplateFor(endpoint_function_name="create_book")},
    )

@app.get("/books/{book_id}", response_model=Book, response_model_exclude_none=True)
def get_book(book_id: uuid.UUID):
    for book in books:
        if book.id == book_id:
            return book
    raise HTTPException(status_code=404, detail="Book not found")

@app.post("/books", response_model=Book, response_model_exclude_none=True)
def create_book(book: BookCreate):
    new_book = Book(**book.model_dump())
    books.append(new_book)
    return new_book
```

`GET /books` returns:

```json
{
  "_links": { "self": { "href": "http://localhost:8000/books", "templated": false } },
  "_templates": {
    "create": {
      "method": "POST",
      "contentType": "application/json",
      "properties": [{ "name": "title", "type": "text", "prompt": "title", "required": true }],
      "target": "http://localhost:8000/books"
    }
  },
  "_embedded": {
    "books": [{
      "_links": {
        "self": { "href": "http://localhost:8000/books/3f2b8c1e-5d4a-4b7e-9c6f-1a2b3c4d5e6f", "templated": false },
        "collection": { "href": "http://localhost:8000/books", "templated": false }
      },
      "id": "3f2b8c1e-5d4a-4b7e-9c6f-1a2b3c4d5e6f",
      "title": "Dune"
    }]
  }
}
```

`path_params` and `params` take either a dict of strings or a callable that receives the resource, as in `Book` above. Links can also be passed per response with `_links=...`, as done for the collection. `condition` (a bool or a callable) leaves a link or template out when it is false. When routers are included more than once, pass `tags` to choose the right route.

## Development

```bash
# from the repository root
pip install -r requirements.txt -r requirements-dev.txt
cd contentgrid_extension_helpers && pytest
```
