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|
use crate::db::users::{Credentials, User};
use crate::db::{sessions, users};
use crate::DatabaseConnection;
use axum::extract::{FromRequest, RequestParts, TypedHeader};
use axum::headers::authorization::Bearer;
use axum::headers::Authorization;
use axum::http::StatusCode;
use axum::response::{IntoResponse, Response};
use axum::{async_trait, Json};
use serde::{Deserialize, Serialize};
use serde_json::json;
use thiserror::Error;
const RESERVED_USERNAMES: &[&str] = &["admin", "system"];
type AuthorizationHeader = TypedHeader<Authorization<Bearer>>;
#[async_trait]
impl<B> FromRequest<B> for User
where
B: Send,
{
type Rejection = (StatusCode, String);
async fn from_request(req: &mut RequestParts<B>) -> Result<Self, Self::Rejection> {
let conn = DatabaseConnection::from_request(req).await?;
let TypedHeader(Authorization(bearer)) = AuthorizationHeader::from_request(req)
.await
.map_err(|_| (StatusCode::UNAUTHORIZED, "".to_string()))?;
let (_session, user) = sessions::find_user_by_session(bearer.token(), &conn)
.map_err(|_| (StatusCode::UNAUTHORIZED, "".to_string()))?;
Ok(user)
}
}
#[derive(Serialize, Deserialize)]
pub struct UserData {
pub user_id: i32,
pub username: String,
}
impl From<User> for UserData {
fn from(user: User) -> Self {
UserData {
user_id: user.id,
username: user.username,
}
}
}
#[derive(Deserialize)]
pub struct RegistrationParams {
pub username: String,
pub password: String,
}
#[derive(Debug, Error)]
pub enum RegistrationError {
#[error("database error")]
DatabaseError(#[from] diesel::result::Error),
#[error("validation failed")]
ValidationFailed(Vec<String>),
}
impl RegistrationParams {
fn validate(&self, conn: &DatabaseConnection) -> Result<(), RegistrationError> {
let mut errors = Vec::new();
// TODO: do we want to support cased usernames?
// this could be done by allowing casing in names, but requiring case-insensitive uniqueness
if !self
.username
.chars()
.all(|c| c.is_ascii_alphanumeric() && !c.is_uppercase())
{
errors.push("username must be alphanumeric and lowercase".to_string());
}
if self.username.len() < 3 {
errors.push("username must be at least 3 characters".to_string());
}
if self.username.len() > 32 {
errors.push("username must be at most 32 characters".to_string());
}
if self.password.len() < 8 {
errors.push("password must be at least 8 characters".to_string());
}
if RESERVED_USERNAMES.contains(&self.username.as_str()) {
errors.push("that username is not allowed".to_string());
}
if users::find_user_by_name(&self.username, &conn).is_ok() {
errors.push("username is already taken".to_string());
}
if errors.is_empty() {
Ok(())
} else {
Err(RegistrationError::ValidationFailed(errors))
}
}
}
impl IntoResponse for RegistrationError {
fn into_response(self) -> Response {
let (status, json_body) = match self {
RegistrationError::DatabaseError(_e) => {
// TODO: create an error response struct
(
StatusCode::INTERNAL_SERVER_ERROR,
json!({
"error": {
"type": "internal_server_error",
}
}),
)
}
RegistrationError::ValidationFailed(errors) => (
StatusCode::UNPROCESSABLE_ENTITY,
json!({
"error": {
"type": "validation_failed",
"validation_errors": errors,
}
}),
),
};
(status, Json(json_body)).into_response()
}
}
pub async fn register(
conn: DatabaseConnection,
params: Json<RegistrationParams>,
) -> Result<Json<UserData>, RegistrationError> {
params.validate(&conn)?;
let credentials = Credentials {
username: ¶ms.username,
password: ¶ms.password,
};
let user = users::create_user(&credentials, &conn)?;
Ok(Json(user.into()))
}
#[derive(Deserialize)]
pub struct LoginParams {
pub username: String,
pub password: String,
}
pub async fn login(conn: DatabaseConnection, params: Json<LoginParams>) -> Response {
let credentials = Credentials {
username: ¶ms.username,
password: ¶ms.password,
};
// TODO: handle failures
let authenticated = users::authenticate_user(&credentials, &conn);
match authenticated {
None => StatusCode::FORBIDDEN.into_response(),
Some(user) => {
let session = sessions::create_session(&user, &conn);
let user_data: UserData = user.into();
let headers = [("Token", &session.token)];
(StatusCode::OK, headers, Json(user_data)).into_response()
}
}
}
pub async fn current_user(user: User) -> Json<UserData> {
Json(user.into())
}
|
