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BLOG-103 Add API documentation with Utoipa (#106)
### Description

This PR integrates the **`utoipa`** and **`utoipa-redoc`** crates to automatically generate OpenAPI-compliant API documentation for the backend project.

#### Overview

To improve development efficiency and API maintainability, this change introduces `utoipa` to automate the API documentation process. By adding specific attribute macros to the source code, we can generate detailed API specifications directly and serve them through an interactive UI provided by `utoipa-redoc`.

#### Key Changes

* **Dependencies Added**
    * Added `utoipa`, `utoipa-gen`, and `utoipa-redoc` to `Cargo.toml`.
    * `utoipa` is used to define OpenAPI objects.
    * `utoipa-redoc` is used to serve the ReDoc documentation UI.

* **Code Refactoring**
    * **HTTP handler logic** in each feature (`auth`, `image`, `post`) has been extracted from the `..._web_routes.rs` files into their own dedicated files (e.g., `get_post_by_id_handler.rs`). This makes the code structure cleaner and simplifies adding documentation attributes to each handler.
    * Renamed the `PostController` method from `get_full_post` to `get_post_by_id` for a more RESTful-compliant naming convention.

* **API Doc Annotation**
    * Added `#[derive(ToSchema)]` or `#[derive(IntoParams)]` to all DTOs (Data Transfer Objects) so they can be recognized by `utoipa` to generate the corresponding schemas.
    * Added the `#[utoipa::path]` macro to all HTTP handler functions, describing the API's path, HTTP method, tags, summary, expected responses, and security settings.

* **Doc Aggregation & Serving**
    * Added an `..._api_doc.rs` file in each feature module to aggregate all API paths within that module.
    * Added a new `api_doc.rs` file in the `server` crate to merge the OpenAPI documents from all features, set global information (like title, version, and the OAuth2 security scheme), and serve the documentation page on the `/redoc` route using `Redoc::with_url`.

### Package Changes

```toml
utoipa = { version = "5.4.0", features = ["actix_extras"] }
utoipa-redoc = { version = "6.0.0", features = ["actix-web"] }
```

### Screenshots

![image.png](/attachments/f5b4b268-f550-4d9e-9321-49a00f6b8e1a)

### Reference

Resolves #103

### Checklist

- [x] A milestone is set
- [x] The related issuse has been linked to this branch

Reviewed-on: #106
Co-authored-by: SquidSpirit <squid@squidspirit.com>
Co-committed-by: SquidSpirit <squid@squidspirit.com>
2025-08-02 06:51:37 +08:00

Blog

Development

  • Frontend: SvelteKit with Tailwind CSS
  • Backend: Rust actix-web

Despite SvelteKit being a full-stack framework, I still decided to adopt a separate front-end and back-end architecture for this blog project. I believe that this separation makes the project cleaner, reduces coupling, and aligns with modern development practices. Furthermore, I wanted to practice developing a purely back-end API.

As for the more detailed development approach, I plan to use Clean Architecture for the overall structure. Of course, such a small project may not necessarily require such complex design patterns, but I want to give myself an opportunity to practice them.

These will allow me to become more proficient in these modern development practices and leave a lot of flexibility and room for adjustments in the future.

For more information about the development process, you can check out the project board. As for the details of the architecture and convention, you can find them in the wiki.

License

This project uses a combination of the MIT License and a custom license. Based on the MIT License, anyone is permitted to use the code. However, before deploying the code, they must first replace any information belonging to "me" or any content that could identify "me," such as logos, names, and "about me" sections.

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📕 My personal blog
https://squidspirit.com/
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