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# Ruuter
A tiny, zero dependency HTTP router for Clojure(Script) that operates with a simple data structure where each route is a map inside a vector. Yup, that's it. No magic, no bullshit.
## Installation
[](https://clojars.org/org.clojars.askonomm/ruuter)
## Usage
### Setting up
Require the namespace `ruuter.core` and then pass your routes to the `route` function along with the current request map, like this:
```clojure
(ns myapp.core
(:require [ruuter.core :as ruuter]))
(def routes [{:path "/"
:method :get
:response {:status 200
:body "Hi there!"}}])
(def request {:uri "/"
:request-method :get})
(ruuter/route routes request) ; => {:status 200
; :body "Hi there!"}
```
This will attempt to match a route with the request map and return the matched route' response. If no route was found, it will attempt to find a route that has a `:path` that is `:not-found`, and return its response instead. But if not even that route was found, it will simply return a built-in 404 response instead.
Note that the `request-method` doesn't have to be a keyword, it can be anything that your HTTP server returns. But it does have to be called `request-method` for the router to know where to look for.
### Setting up with [http-kit](https://github.com/http-kit/http-kit)
Now, obviously on its own the router is not very useful as it needs an actual HTTP server to return the responses to the world, so here's an example that uses [http-kit](https://github.com/http-kit/http-kit):
```clojure
(ns myapp.core
(:require [ruuter.core :as ruuter]
[org.httpkit.server :as http]))
(def routes [{:path "/"
:method :get
:response {:status 200
:body "Hi there!"}}
{:path "/hello/:who"
:method :get
:response (fn [req]
{:status 200
:body (str "Hello, " (:who (:params req)))})}])
(defn -main []
(http/run-server #(ruuter/route routes %) {:port 8080}))
```
### Setting up with [Ring + Jetty](https://github.com/ring-clojure/ring)
[Ring + Jetty](https://github.com/ring-clojure/ring) set-up is almost identical to the one of http-kit, and looks like this:
```clojure
(ns myapp.core
(:require [ruuter.core :as ruuter]
[ring.adapter.jetty :as jetty]))
(def routes [{:path "/"
:method :get
:response {:status 200
:body "Hi there!"}}
{:path "/hello/:who"
:method :get
:response (fn [req]
{:status 200
:body (str "Hello, " (:who (:params req)))})}])
(defn -main []
(jetty/run-jetty #(ruuter/route routes %) {:port 8080}))
```
### Setting up with [Babashka](https://github.com/babashka/babashka)
You can also use Ruuter with [Babashka](https://github.com/babashka/babashka), by using the built-in http-kit server, for example. Either add the dependency in your `bb.edn` file or if you want to make the whole thing one-file-rules-them-all, then load it in with `deps/add-deps`, like below:
```clojure
#!/usr/bin/env bb
(require '[org.httpkit.server :as http]
'[babashka.deps :as deps])
(deps/add-deps '{:deps {org.clojars.askonomm/ruuter {:mvn/version "1.1.0"}}})
(require '[ruuter.core :as ruuter])
(def routes [{:path "/"
:method :get
:response {:status 200
:body "Hi there!"}}])
(http/run-server #(ruuter/route routes %) {:port 8082})
@(promise)
```
### Creating routes
Like mentioned above, each route is a map inside of a vector - the order is important only in that the route matcher will return the first result it finds according to `:path`.
Each route consists of three items:
#### `:path`
A string path starting with a forward slash describing the URL path to match.
To create parameters from the path, prepend a colon (:) in front of a path slice like you would with a Clojure keyword. For example a string such as `/hi/:name` would match any string that matches the `\/hi\/.*` regex. The `:name` itself will then be available with its value from the `request` passed to the response function, like this:
```clojure
(fn [req]
(let [name (:name (:params req))]
{:status 200
:body (str "Hi, " name)}))
```
Additionally, you may want to use an optional parameter, in which case you'd want to add a question mark to the end of it, like `/hi/:name?`, which will match the `\/hi\/?.*?` regex, meaning that the previous forward slash is optional, and what comes after that is also optional.
#### `:method`
The HTTP method to listen for when matching the given path. This can be whatever the HTTP server uses. For example, if you're using http-kit for the HTTP server then the accepted values are:
- `:get`
- `:post`
- `:put`
- `:delete`
- `:head`
- `:options`
- `:patch`
#### `:response`
The response can be a direct map, or a function returning a map. In case of a function, you will also get passed to you the `request` map that the HTTP server returns, with added-in `:params` that contain the values for the URL parameters you use in your route's `:path`.
Thus, a `:response` can be a map:
```clojure
{:status 200
:body "Hi there!"}
```
Or a function returning a map:
```clojure
(fn [req]
{:status 200
:body "Hi there!"})
```
What the actual map can contain that you return depends again on the HTTP server you decided to use Ruuter with. The examples I've noted here are based on [http-kit](https://github.com/http-kit/http-kit) & [ring + jetty](https://github.com/ring-clojure/ring), but feel free to make a PR with additions for other HTTP servers.
## Changelog
### 1.2.1
- Fixed an issue with regex parsing. Sorry about that.
### 1.2.0
- Implemented optional route parameters, so now you can do paths like `/hi/:name?` in your routes, and it would match the route even if the `:name` is not present. All you have to do is add a question mark to the parameter, and that's it.
- Changed Ruuter from a .clj file to a .cljc file, so it would also work with ClojureScript. Although it would probably require a more hands-on set-up than just a drop-in to an HTTP server like http-kit or ring + jetty, there is no reason that the router itself wouldn't work as it does not rely on any platform-specific code.
- Ruuter also works with [Babashka](https://github.com/babashka/babashka), and I've created a "Setting up with Babashka" section in this README to show that.
### 1.1.0
- Made Ruuter server-agnostic, which means now it really is just a router and nothing else, and can thus be used with just about any HTTP server you can throw at it. It also means there are now zero dependencies! ZERO!
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