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(ns tryclojure.core
(:use ring.adapter.jetty
[hiccup form-helpers page-helpers]
[ring.middleware reload stacktrace params file session]
noir.core
[noir.response :only [json]]
[clojure.stacktrace :only [root-cause]]
[clojail.core :only [sandbox]]
[clojail.testers :only [secure-tester-without-def]])
(:require [noir.server :as server]
[noir.session :as session])
(:import java.io.StringWriter
java.util.concurrent.TimeoutException))
(defpartial links []
(unordered-list
[(link-to "http://clojure.org" "The official Clojure website")
(link-to "http://dev.clojure.org/display/doc/Getting+Started" "Getting started with Clojure")
(link-to "http://groups.google.com/group/clojure" "Clojure mailing list")
(link-to "http://java.ociweb.com/mark/clojure/article.html" "A comprehensive Clojure tutorial")
(link-to "http://joyofclojure.com/" "The Joy of Clojure: a book by Michael Fogus and Chris Houser")
(link-to "http://disclojure.org" "Disclojure")
(link-to "http://planet.clojure.in" "Planet Clojure")]))
(def github-link (link-to "http://github.com/Raynes/tryclojure" "github"))
(defpartial about-html []
[:p.bottom
"Please note that this REPL is sandboxed, so you wont be able to do everything in it "
"that you would in a local unsandboxed REPL. Keep in mind that this site is designed for "
"beginners to try out Clojure and not necessarily as a general-purpose server-side REPL."]
[:p.bottom
"One quirk you might run into is that things you bind with def can sometimes disappear. "
"The sandbox wipes defs if you def too many things, so don't be surprised. Furthermore, "
"The sandbox will automatically be wiped after 15 minutes and if you evaluate more after that,"
"It'll be in an entirely new namespace/sandbox."]
[:p.bottom
"You can find the site's source and such on its "
github-link
" page."]
[:p.bottom
"TryClojure is written in Clojure and JavaScript (JQuery), powered by "
(link-to "https://github.com/flatland/clojail" "clojail")
" and Chris Done's "
(link-to "https://github.com/chrisdone/jquery-console" "jquery-console")]
[:p.bottom "Design by " (link-to "http://apgwoz.com" "Andrew Gwozdziewycz")])
(defpartial home-html []
[:p.bottom
"Welcome to Try Clojure. See that little box up there? That's a Clojure repl. You can type "
"expressions and see their results right here in your browser. We also have a brief tutorial to "
"give you a taste of Clojure. Try it out by typing " [:code.expr "tutorial"] " in the console!"]
[:p.bottom
"Check out the site's source on "
(link-to "http://github.com/Raynes/tryclojure" "github")
"!"])
(defpartial root-html []
(html4
[:head
(include-css "/resources/public/css/tryclojure.css")
(include-js "/resources/public/javascript/jquery-1.4.2.min.js"
"/resources/public/javascript/jquery.console.js"
"/resources/public/javascript/tryclojure.js")
[:title "Try Clojure"]]
[:body
[:div#wrapper
[:div#content
[:div#header
[:h1
[:span.logo-try "Try"] " "
[:span.logo-clojure "Clo" [:em "j"] "ure"]]]
[:div#container
[:div#console.console]
[:div#buttons
[:a#home.buttons "home"]
[:a#links.buttons "links"]
[:a#about.buttons.last "about"]]
[:div#changer (home-html)]]
[:div.footer
[:p.bottom "©2011 Anthony Grimes and numerous contributors"]
[:p.bottom
"Built with "
(link-to "http://webnoir.org" "Noir")
"."]]]]]))
(defpage "/" []
(root-html))
(defpage "/home" []
(home-html))
(defpage "/about" []
(about-html))
(defpage "/links" []
(links))
(defpage [:post "/tutorial"] {n :n}
(slurp (str "resources/public/tutorial/page" n ".html")))
(defn eval-form [form sbox]
(with-open [out (java.io.StringWriter.)]
(let [result (sbox form {#'*out* out})]
{:expr form
:result [out result]})))
(defn eval-string [expr sbox]
(let [form (binding [*read-eval* false] (read-string expr))]
(eval-form form sbox)))
(def sandboxes (atom {:counter 0}))
(def try-clojure-tester
(into secure-tester-without-def
#{'tryclojure.core}))
(defn add-user [old]
(let [count (inc (:counter old))]
(assoc old
:counter count
count (sandbox try-clojure-tester :timeout 2000))))
(defn eval-request [expr]
(try
(eval-string
expr
(do
(if-let [sb (@sandboxes (session/get :sb))]
sb
(let [sbs (swap! sandboxes add-user)
count (:counter sbs)]
(session/put! :sb count)
(future (Thread/sleep 900000)
(swap! sandboxes dissoc count))
(sbs count)))))
(catch TimeoutException _
{:error true :message "Execution Timed Out!"})
(catch Exception e
{:error true :message (str (root-cause e))})))
(defpage "/eval.json" {:keys [expr]}
(json
(let [{:keys [expr result error message] :as res} (eval-request expr)]
(if error
res
(let [[out res] result]
{:expr (pr-str expr)
:result (str out (pr-str res))})))))
(server/add-middleware wrap-file (System/getProperty "user.dir"))
(defn to-port [s]
(when-let [port s] (Long. port)))
(defn tryclj [& [port]]
(server/start
(or (to-port port)
(to-port (System/getenv "PORT")) ;; For deploying to Heroku
8801)))
(defn -main [& args] (tryclj (first args)))
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