Initial commit

src/main.rs

@@ -0,0 +1,110 @@
+#![feature(proc_macro_hygiene, decl_macro)]
+
+#[macro_use] extern crate lazy_static;
+
+#[macro_use] extern crate rocket;
+extern crate rocket_contrib;
+
+extern crate gpw;
+extern crate syntect;
+extern crate chashmap;
+
+use rocket_contrib::templates::Template;
+use rocket::response::Redirect;
+use rocket::request::Form;
+
+use serde::Serialize;
+use syntect::parsing::SyntaxSet;
+use syntect::highlighting::ThemeSet;
+use syntect::easy::HighlightLines;
+use syntect::html::{styled_line_to_highlighted_html, IncludeBackground};
+
+use chashmap::CHashMap;
+use std::borrow::Cow;
+use std::cell::RefCell;
+
+lazy_static! {
+    static ref ENTRIES: CHashMap<String, String> = CHashMap::new();
+}
+
+
+#[derive(FromForm)]
+struct IndexForm {
+    val: String
+}
+
+#[get("/")]
+fn index() -> Template {
+    #[derive(Serialize)]
+    struct Index {}
+
+    Template::render("index", Index {})
+}
+
+
+/// Generates a randomly generated id, stores the given paste under that id and then returns the id.
+fn store_paste(content: String) -> String {
+    thread_local!(static KEYGEN: RefCell<gpw::PasswordGenerator> = RefCell::new(gpw::PasswordGenerator::default()));
+
+    let id = KEYGEN.with(|k| k.borrow_mut().next().unwrap());
+    ENTRIES.insert(id.clone(), content);
+    id
+}
+
+#[post("/", data = "<input>")]
+fn submit(input: Form<IndexForm>) -> Redirect {
+    let id = store_paste(input.into_inner().val);
+    Redirect::to(format!("/{}", id))
+}
+
+#[put("/", data = "<input>")]
+fn submit_raw(input: String) -> String {
+    format!("https://{}/{}", "localhost:8000", store_paste(input))
+}
+
+
+/// Takes the content of a paste and the extension passed in by the viewer and will return the content
+/// highlighted in the appropriate format in HTML.
+fn highlight(content: &str, ext: &str) -> Option<String> {
+    lazy_static! {
+        static ref SS: SyntaxSet = SyntaxSet::load_defaults_newlines();
+        static ref TS: ThemeSet = ThemeSet::load_defaults();
+    }
+
+    let syntax = SS.find_syntax_by_extension(ext)?;
+    let mut h = HighlightLines::new(syntax, &TS.themes["base16-ocean.dark"]);
+    let regions = h.highlight(content, &SS);
+
+    Some(styled_line_to_highlighted_html(&regions[..], IncludeBackground::No))
+}
+
+#[get("/<key>")]
+fn render<'a>(key: String) -> Option<Template> {
+    let mut splitter = key.splitn(2, ".");
+    let key = splitter.next().unwrap();
+    let ext = splitter.next();
+
+    // get() returns a read-only lock, we're not going to be writing to this key
+    // again so we can hold this for as long as we want
+    let entry = ENTRIES.get(key)?;
+
+    #[derive(Serialize)]
+    struct Render<'a> {
+        content: Cow<'a, String>
+    }
+
+    Some(Template::render("paste", Render {
+        content: match ext {
+            None => Cow::Borrowed(&*entry),
+            Some(extension) => Cow::Owned(highlight(&*entry, extension)?)
+        }
+    }))
+}
+
+
+fn main() {
+    rocket::ignite()
+        .attach(Template::fairing())
+        .mount("/", routes![index, submit, submit_raw, render])
+        .launch();
+}