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use crate::{
server::route_handler::{HandlerResult, RouteHandler},
HttpMethod, Middleware, Request, Response, StatusCode,
};
use endpoint::Endpoint;
use regex::Regex;
use std::{collections::HashMap, fmt::Display, iter::Peekable, slice::Iter};
pub mod endpoint;
pub mod methods;
pub(crate) type Controller = fn(&Request, &mut Response);
type RouterResult<'a> = Option<(&'a mut Endpoint, HashMap<String, String>)>;
// TODO: Look at Radix Tree
#[doc = include_str!("../docs/core/router.md")]
#[derive(Debug)]
pub struct Router {
endpoints: Vec<Endpoint>,
middlewares: Vec<Box<dyn Middleware>>,
subdirs: HashMap<String, Box<Router>>,
param_dir: Option<(String, Box<Router>)>,
}
impl Router {
/// Creates a new router
///
/// # Example
///
/// To create a `GET` method for `/`
///
/// ```rust
/// use krustie::{ Router, StatusCode, Server };
///
/// let mut server = Server::create();
/// let mut main_router = Router::new();
///
/// main_router.get("/", |req, res| {
/// res.status(StatusCode::Ok);
/// });
///
/// server.use_handler(main_router);
/// ```
pub fn new() -> Self {
Self {
endpoints: Vec::new(),
middlewares: Vec::new(),
subdirs: HashMap::new(),
param_dir: None,
}
}
/// Adds a subrouter to a router. It is useful for creating subdirectories.
///
/// # Example
///
/// Create a 'POST' method for `/user/comments`
///
/// ```rust
/// use krustie::{ Server, Router, StatusCode };
///
/// let mut server = Server::create();
///
/// let mut main_router = Router::new();
/// let mut user_router = Router::new();
/// let mut comments_router = Router::new();
///
/// comments_router.post("/", |req, res| {
/// res.status(StatusCode::Ok);
/// });
///
/// user_router.use_router("/comments", comments_router);
/// main_router.use_router("/user", user_router);
///
/// server.use_handler(main_router);
/// ```
pub fn use_router(&mut self, path: &str, router: Router) {
let path = path.trim();
if path == "/" || path.is_empty() {
panic!("Route already exist.");
}
let path_types = Self::get_path_types(path);
let mut types_iter = path_types.into_iter().peekable();
Self::add_router(self, router, &mut types_iter);
}
/// Adds an endpoint to a router.
///
/// # Example
///
/// Create a 'GET' method for `/user`
///
/// ```rust
/// use krustie::{ Server, Router, StatusCode, Request, Response, HttpMethod, Endpoint };
///
/// let mut server = Server::create();
/// let mut main_router = Router::new();
///
/// let endpoint = Endpoint::new(HttpMethod::GET, get);
///
/// main_router.use_endpoint("/user", endpoint);
///
/// server.use_handler(main_router);
///
/// fn get(req: &Request, res: &mut Response) {
/// res.status(StatusCode::Ok);
/// }
///
/// ```
pub fn use_endpoint(&mut self, path: &str, endpoint: Endpoint) {
let path = path.trim();
if path == "/" || path.is_empty() {
self.endpoints.push(endpoint);
} else {
let path_types = Self::get_path_types(path);
let mut types_iter = path_types.into_iter().peekable();
Self::add_endpoint(self, endpoint, &mut types_iter)
}
}
fn add_router<'a>(
router: &'a mut Router,
new_router: Router,
iter: &mut Peekable<std::vec::IntoIter<PathType>>,
) {
match iter.next() {
Some(PathType::Subdirectory(path)) => {
match router.subdirs.get_mut(&path) {
Some(found_router) => {
// Router Found
Self::add_router(found_router, new_router, iter);
}
_ => {
if iter.peek().is_some() {
// No Router & Iteration Continues
let mut inserted_router = Box::new(Router::new());
Self::add_router(inserted_router.as_mut(), new_router, iter);
router.subdirs.insert(path, inserted_router);
} else {
// No Router & Iteration Ends
router.subdirs.insert(path, Box::new(new_router));
}
}
}
}
Some(PathType::Parameter(param)) => {
match &mut router.param_dir {
Some(found_router) => {
// Router Found
Self::add_router(found_router.1.as_mut(), new_router, iter);
}
_ => {
if iter.peek().is_some() {
// No Router & Iteration Continues
let mut inserted_router = Box::new(Router::new());
Self::add_router(inserted_router.as_mut(), new_router, iter);
router.param_dir = Some((param, Box::new(Router::new())));
} else {
// No Router & Iteration Ends
router.param_dir = Some((param, Box::new(new_router)));
}
}
}
}
None => {
panic!("Route already exist. (Merging routers is not allowed for now.)");
}
}
}
fn add_endpoint<'a>(
router: &'a mut Router,
endpoint: Endpoint,
iter: &mut Peekable<std::vec::IntoIter<PathType>>,
) {
match iter.next() {
Some(PathType::Subdirectory(path)) => {
if iter.peek().is_some() {
// Iteration Will Continue
match router.subdirs.get_mut(&path) {
Some(found_router) => {
// Router Found
Self::add_endpoint(found_router, endpoint, iter);
}
_ => {
// No Router
let mut inserted_router = Box::new(Router::new());
Self::add_endpoint(inserted_router.as_mut(), endpoint, iter);
router.subdirs.insert(path, inserted_router);
}
}
} else {
// Iteration Will End
match router.subdirs.get_mut(&path) {
Some(found_router) => {
// Router Found
found_router.endpoints.push(endpoint);
}
_ => {
// No Router
let mut inserted_router = Box::new(Router::new());
inserted_router.endpoints.push(endpoint);
router.subdirs.insert(path, inserted_router);
}
}
}
}
Some(PathType::Parameter(param)) => {
if iter.peek().is_some() {
// Iteration Will Continue
match &mut router.param_dir {
Some(found_router) => {
// Router Found
Self::add_endpoint(found_router.1.as_mut(), endpoint, iter);
}
_ => {
// No Router
let mut inserted_router = Box::new(Router::new());
Self::add_endpoint(inserted_router.as_mut(), endpoint, iter);
router.param_dir = Some((param, inserted_router));
}
}
} else {
// Iteration Will End
match &mut router.param_dir {
Some(found_router) => {
// Router Found
found_router.1.endpoints.push(endpoint);
}
_ => {
// No Router
let mut inserted_router = Box::new(Router::new());
inserted_router.endpoints.push(endpoint);
router.param_dir = Some((param, inserted_router));
}
}
}
}
None => {
panic!("Error: Route already exist.")
}
}
}
fn route_handler<'a>(
&'a mut self,
path_array: &Vec<String>,
method: &HttpMethod,
) -> RouterResult<'a> {
let params: HashMap<String, String> = HashMap::new();
let iter: Iter<'_, String> = path_array.iter();
Self::handle_routes(self, method, params, iter)
}
fn handle_routes<'a, 'b>(
router: &'a mut Router,
method: &HttpMethod,
mut params: HashMap<String, String>,
mut iter: Iter<'_, String>,
) -> RouterResult<'a> {
if let Some(route) = iter.next() {
let route = route
.split('?')
.collect::<Vec<&str>>()
.first()
.unwrap()
.to_string();
if route.is_empty() {
return Self::handle_routes(router, method, params, iter);
}
// Iteration Continues
match router.subdirs.get_mut(route.as_str()) {
Some(founded_router) => {
// Router Found
Self::handle_routes(founded_router.as_mut(), method, params, iter)
}
_ => {
match router.param_dir.as_mut() {
Some((param_name, founded_router)) => {
// Parameter Found
params.insert(param_name.clone(), route);
Self::handle_routes(founded_router, method, params, iter)
}
_ => None,
}
}
}
} else {
// Iteration Ends
match router
.endpoints
.iter_mut()
.find(|endpoint| endpoint.is_method(method))
{
Some(endpoint) => Some((endpoint, params)),
None => None,
}
}
}
fn get_path_types(path: &str) -> Vec<PathType> {
path.split('/')
.into_iter()
.filter(|path| !path.is_empty())
.map(|path| match PathType::try_from(path) {
Ok(path_type) => path_type,
Err(err) => panic!("Error while adding router: {}", err),
})
.collect::<Vec<PathType>>()
}
}
impl RouteHandler for Router {
fn handle(&mut self, request: &Request, response: &mut Response) -> HandlerResult {
while let Some(middleware) = self.middlewares.iter_mut().next() {
match middleware.middleware(request, response) {
HandlerResult::End => {
return HandlerResult::End;
}
HandlerResult::Next => (),
}
}
match self.route_handler(request.get_path_array(), request.get_method()) {
Some((endpoint, params)) => {
while let Some(middleware) = endpoint.get_middlewares().iter_mut().next() {
match middleware.middleware(request, response) {
HandlerResult::End => {
return HandlerResult::End;
}
HandlerResult::Next => (),
}
}
let mut request = request.clone();
request.add_param(params);
endpoint.get_controller()(&request, response);
return HandlerResult::Next;
}
None => {
response.status(StatusCode::NotFound);
return HandlerResult::Next;
}
}
}
}
impl Clone for Router {
fn clone(&self) -> Self {
let endpoints: Vec<Endpoint> = self.endpoints.clone();
let middlewares: Vec<Box<dyn Middleware>> = self.middlewares.clone();
let subdirs: HashMap<String, Box<Router>> = self.subdirs.clone();
let param_dir: Option<(String, Box<Router>)> = match &self.param_dir {
Some((key, router)) => Some((key.clone(), router.clone())),
None => None,
};
Self {
endpoints,
middlewares,
subdirs,
param_dir,
}
}
}
#[derive(Eq, Hash, PartialEq, Debug)]
enum PathType {
Subdirectory(String),
Parameter(String),
}
impl TryFrom<&str> for PathType {
type Error = ParsePathTypeError;
fn try_from(value: &str) -> Result<Self, Self::Error> {
if value.starts_with(':') {
return Ok(Self::Parameter(value.chars().skip(1).collect::<String>()));
} else {
let regex = Regex::new(r"^[a-zA-Z0-9_\-.]+$").unwrap();
if regex.is_match(value) {
return Ok(Self::Subdirectory(value.to_string()));
} else {
return Err(ParsePathTypeError(value.to_string()));
}
}
}
}
/// Error for parsing path types while adding a router.
#[derive(Debug, Clone)]
pub struct ParsePathTypeError(String);
impl Display for ParsePathTypeError {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "Invalid path value for router: {}", self.0)
}
}