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A Rust crate for managing authentication and authorization with support for multi-tenant / B2B products, powered by PropelAuth

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# PropelAuth Rust Library

Add authentication and authorization to your application.

This library is meant to be used with a [PropelAuth](https://www.propelauth.com/) account.
You can sign up and get started for free.

## Initialize

First, you'll need to initialize the library. You can either call `PropelAuth::init`
or `PropelAuth::fetch_and_init` (which will fetch any unspecified metadata).

```rust
let auth = PropelAuth::fetch_and_init(AuthOptions {
    auth_url: "REPLACE_ME".to_string(),
    api_key: "REPLACE_ME".to_string(),
}).await.expect("Unable to initialize authentication");
```

## Usage / Protecting APIs

- [Axum](#axum)
- [Actix](#actix)
- [Other](#other)

Want us to add support for another framework? Reach out at support@propelauth.com

## Axum

To use Axum, make sure to enable the `axum` feature in your Cargo.toml.

Then, add PropelAuthLayer to your Router:

```rust
let auth_layer = PropelAuthLayer::new(auth);

let app = Router::new()
    .route("/whoami", get(whoami))
    .route("/org/:org_name/whoami", get(org_whoami))
    .layer(auth_layer); // <-- here
```

You can then take `User` in as an argument, which will look for an [access token](https://docs.propelauth.com/guides-and-examples/guides/access-tokens) in the Authorization header.

```rust
// User will automatically return a 401 (Unauthorized) if a valid access token wasn't provided
async fn whoami(user: User) -> String {
    user.user_id
}
```

You can also check which [organizations](https://docs.propelauth.com/overview/organizations/) the user is in, and which [roles and permissions](https://docs.propelauth.com/overview/authorization/rbac) they have.

```rust
// If the user isn't in the provided organization, a 403 is returned
async fn org_whoami(user: User,
                    Path(org_name): Path<String>) -> Result<String, UnauthorizedOrForbiddenError> {
    let org = user.validate_org_membership(RequiredOrg::OrgName(&org_name),
                                           UserRequirementsInOrg::IsRole("Admin"))?;
    Ok(format!("You are a {} in {}", org.user_role, org.org_name))
}
```

You can also get the full `auth` struct and make API calls with it:

```rust
// Extension(auth) is useful for making API requests
async fn make_req(Extension(auth): Extension<Arc<PropelAuth>>) -> String {
    let magic_link = auth.user().create_magic_link(CreateMagicLinkRequest {
        email: "user@customer.com".to_string(),
        ..Default::default()
    }).await.expect("Couldn't create magic link");
    magic_link.url
}
```
## Actix

To use Actix, make sure to enable the `actix4` feature in your Cargo.toml.

Add your PropelAuth to your Router:

```rust
let auth = PropelAuth::fetch_and_init(/*...*/)
//...
HttpServer::new(move || {
    App::new()
        .service(whoami)
        .service(org_whoami)
        .app_data(web::Data::new(auth.clone())) // <-- here
})
```

You can then take `User` in as an argument, which will look for an [access token](https://docs.propelauth.com/guides-and-examples/guides/access-tokens) in the Authorization header.

```rust
// User will automatically return a 401 (Unauthorized) if a valid access token wasn't provided
#[get("/whoami")]
async fn whoami(user: User) -> impl Responder {
    HttpResponse::Ok().json(user)
}
```

```rust
// If the user isn't in the provided organization, a 403 is returned
#[get("/org/{org_name}/whoami")]
async fn whoami(user: User, org_name: web::Path<String>) -> Result<impl Responder, UnauthorizedOrForbiddenError> {
   let org = user.validate_org_membership(RequiredOrg::OrgName(&org_name.into_inner()),
                                          UserRequirementsInOrg::IsRole("Admin"))?;
   Ok(HttpResponse::Ok()
       .body(format!("You are a {} in {}", org.user_role, org.org_name)))
}
```

You can also get the full `auth` struct and make API calls with it:

```rust
#[post("/magic_link")]
async fn make_req(auth: web::Data<PropelAuth>) -> impl Responder {
    let magic_link = auth.user().create_magic_link(CreateMagicLinkRequest {
        email: "user@customer.com".to_string(),
        ..Default::default()
    }).await.expect("Couldn't create magic link");
    HttpResponse::Ok().json(magic_link)
}
```

## Rustls instead of OpenSSL

If you'd rather use a pure Rust TLS implementation rather than OpenSSL disable the default features and enable rustls as so:

```toml
propelauth = { version >= "0.12.1", features = ["rustls"], default-features = false }
```

## Other

After initializing `auth`, you can verify [access tokens](https://docs.propelauth.com/guides-and-examples/guides/access-tokens) by passing in the Authorization header (formatted `Bearer TOKEN`):

```rust
let result = auth.verify().validate_authorization_header(&authorization_header);
match result {
    Ok(user) => { /* valid access token in the header */ }
    Err(_) => { /* invalid access token, typically we return a 401 Unauthorized here */ }
}
```
You can also check which [organizations](https://docs.propelauth.com/overview/organizations/) the user is in, and which [roles and permissions](https://docs.propelauth.com/overview/authorization/rbac) they have.

```rust
let org = auth.validate_org_membership(
    &authorization_header,
    RequiredOrg::OrgName("acme"),
    UserRequirementsInOrg::IsRole("Admin")
)?;

// Alternatively, if you already have a user from validate_authorization_header
let org = user.validate_org_membership(
    RequiredOrg::OrgName("acme"),
    UserRequirementsInOrg::IsRole("Admin")
)?;
```

And finally, you can make API calls directly from `auth.user()` and `auth.org()`

## Where do the access tokens come from?

They come from your frontend.
You can read more about integrating your frontend [here](https://docs.propelauth.com/getting-started/quickstart-fe).

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