server: replace guile with rust (init)

this is just a quick barebones server, which doesn't really do yet what
it is supposed to or what the guile version did.

6 files changed, 756 insertions, 116 deletions

diff --git a/server/Cargo.lock b/server/Cargo.lock
new file mode 100644
index 0000000..5800be3
--- /dev/null
+++ b/server/Cargo.lock
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+]
+
+[[package]]
+name = "tracing-core"
+version = "0.1.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f50de3927f93d202783f4513cda820ab47ef17f624b03c096e86ef00c67e6b5f"
+dependencies = [
+ "lazy_static",
+]
+
+[[package]]
+name = "try-lock"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "59547bce71d9c38b83d9c0e92b6066c4253371f15005def0c30d9657f50c7642"
+
+[[package]]
+name = "typenum"
+version = "1.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "879f6906492a7cd215bfa4cf595b600146ccfac0c79bcbd1f3000162af5e8b06"
+
+[[package]]
+name = "unicode-xid"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
+
+[[package]]
+name = "version_check"
+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5fecdca9a5291cc2b8dcf7dc02453fee791a280f3743cb0905f8822ae463b3fe"
+
+[[package]]
+name = "want"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1ce8a968cb1cd110d136ff8b819a556d6fb6d919363c61534f6860c7eb172ba0"
+dependencies = [
+ "log",
+ "try-lock",
+]
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/server/Cargo.toml b/server/Cargo.toml
new file mode 100644
index 0000000..82b4f20
--- /dev/null
+++ b/server/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "server"
+version = "0.1.0"
+authors = ["stuebinm <stuebinm@disroot.org>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+hyper = { version = "0.14", features = ["full"] }
+tokio = { version = "1", features = ["full"] }
+futures = "0.3"
+sha2 = "0.9.3"
+hex = "0.4.3"
diff --git a/server/Readme.org b/server/Readme.org
deleted file mode 100644
index 1242159..0000000
--- a/server/Readme.org
+++ /dev/null
@@ -1,14 +0,0 @@
-#+TITLE: Simple Server that accepts survey answers
-
-Run with:
-#+BEGIN_SRC
-guile server.scm
-#+END_SRC
-
-Will listen to localhost:8080, and accept files sent via POST with
-mimetypes of either ~text/plain~ (which will be appended to a single
-file in the working directory) or ~text/age~ (which will be kept as a
-single file).
-
-Expects a custom header ~X-Survey~ in these requests to know which survey
-the answer belongs to.
diff --git a/server/server.scm b/server/server.scm
deleted file mode 100644
index 751ef01..0000000
--- a/server/server.scm
+++ /dev/null
@@ -1,102 +0,0 @@
-(use-modules (web server)
-             (web request)
-             (web response)
-             (web http)
-             (web uri))
-
-(use-modules (ice-9 format)
-             (ice-9 textual-ports)
-             (ice-9 iconv)
-             (ice-9 match)
-             (ice-9 binary-ports))
-
-
-(define (get-path request)
-  (split-and-decode-uri-path (uri-path (request-uri request))))
-
-(define (get-last list)
-  (list-ref list (- (length list) 1)))
-
-;; This was intended to also server the files.
-;; However, it turns out that guile will attempt to "sanitise" anything
-;; sent as response to anything, which includes attaching charsets to
-;; all mimetypes it sees. Since the wasm specifications are also weird,
-;; this results in the app not running at all since web assembly can't
-;; be instantiated correctly on the client's side.
-;;
-;; So instead, just use another web server for serving files.
-(define (fetch-file path)
-  (let ((ext (car (cdr (string-split (car (last-pair path)) (string->char-set "."))))))
-    (let ((mimetype
-           (cond
-            ((equal? ext "html") 'text/html)
-            ((equal? ext "css") 'text/css)
-            ((equal? ext "js") 'text/javascript)
-            ((equal? ext "wasm") 'application/wasm)
-            (else "undefined"))))
-      (format #t "mimetype for .~a is ~a\n" ext mimetype)
-      (format #t "~a" (values `((content-type ,mimetype)) "test"))
-      (values (build-response
-               #:code 200
-               #:headers `((content-type . (,mimetype (charset . "iso-8859-1"))))
-               #:validate-headers? #f)
-              (call-with-input-file (format #f "~a" (get-last path))
-                (lambda (port) (get-string-all port)))))))
-
-(define (call-with-append-file filename proc)
-  (let ((port (open-file filename "a")))
-    (proc port)
-    (newline port)
-    (close port)))
-
-;; extracts the (first) content type given in a set of headers
-;; TODO: saveguards against multiple given content-types?
-(define (get-header type request)
-  (cdr (car (filter
-             (lambda (header)
-               (equal? (car header) type))
-             (request-headers request)))))
-
-;; accepts a POST request (assuming it contains a survey
-;; response which should be saved somewhere)
-(define (do-post request body)
-  (let ((survey (get-header 'x-survey request)))
-    (format #t "answer to survey ~a " survey)
-    ;; debug option to display ingoing answers before saving
-    ;(format #t "~a\n" (bytevector->string body "utf8"))
-    ;; content-types are wrapped into an extra () by guile
-    (case (car (get-header 'content-type request))
-      ((text/age) (call-with-output-file
-                      (string-append
-                       survey "-answer"
-                       ; save encrypted answers in their own files, using a hash
-                       ; of the answer as name postfix (since age doesn't
-                       ; produce the same ciphertext for the same input twice,
-                       ; this ensures absence of collissions /and/ not counting
-                       ; answers mistakenly sent twice double!)
-                       (number->string (hash body 10000000000)) ".age")
-                    (lambda (port)
-                      (display "(encrypted)\n")
-                      (put-bytevector port body))))
-      ((text/plain) (call-with-append-file
-                     (string-append survey ".survey")
-                     (lambda (port)
-                       (display "(plaintext)\n")
-                       (display (bytevector->string body "utf8") port)))))
-    (values '((content-type . (text/plain)))
-            "Hey, thanks for your answers!\n")))
-
-;; main server function; delivers files on GET, and interprets
-;; everything else as attempts at submissions.
-(define (test-handler request body)
-  (let ((path (get-path request)))
-    (format #t "got request: ~a: ~:a\n"
-            (request-method request)
-            path)
-    (if (equal? (format #f "~a" (request-method request)) "POST")
-        (do-post request body)
-        (values '() "nothing here"))))
-
-
-
-(run-server test-handler)
diff --git a/server/shell.nix b/server/shell.nix
new file mode 100644
index 0000000..1af9bbb
--- /dev/null
+++ b/server/shell.nix
@@ -0,0 +1,14 @@
+let
+  moz_overlay = import (builtins.fetchTarball https://github.com/mozilla/nixpkgs-mozilla/archive/master.tar.gz);
+  nixpkgs = import <nixpkgs> { overlays = [ moz_overlay ]; };
+in
+  with nixpkgs;
+  stdenv.mkDerivation {
+    name = "moz_overlay_shell";
+    buildInputs = [
+      #nixpkgs.latest.rustChannels.nightly.rust
+      nixpkgs.latest.rustChannels.stable.rust
+      openssl pkg-config
+      rls cargo
+    ];
+  }
diff --git a/server/src/main.rs b/server/src/main.rs
new file mode 100644
index 0000000..ec2c77c
--- /dev/null
+++ b/server/src/main.rs
@@ -0,0 +1,64 @@
+
+use hyper::service::{make_service_fn, service_fn};
+use hyper::{Body, Method, Request, Response, Server, StatusCode};
+use sha2::{Sha256, Digest};
+use std::io::Write;
+
+/// This is our service handler. It receives a Request, routes on its
+/// path, and returns a Future of a Response.
+async fn echo(req: Request<Body>) -> Result<Response<Body>, hyper::Error> {
+    match (req.method(), req.uri().path()) {
+        // Serve some instructions at /
+        (&Method::GET, "/") => Ok(Response::new(Body::from(
+            "Try POSTing data to /echo such as: `curl localhost:8000/echo -XPOST -d 'hello world'`",
+        ))),
+
+        // Simply echo the body back to the client.
+        (&Method::POST, "/echo") => Ok(Response::new(req.into_body())),
+
+        (&Method::POST, "/survey") => {
+            let full_body = hyper::body::to_bytes(req.into_body()).await?;
+            let mut hasher = Sha256::new();
+            hasher.update(full_body.clone());
+            let hash = hasher.finalize();
+
+            let mut file = std::fs::File::create(
+                format!("answers-{}.age", hex::encode(hash))
+            ).unwrap();
+
+            file.write_all(&full_body).unwrap();
+            println!("got hash: {:?}", hash);
+            Ok(Response::new(
+                "thanks for hading in these answers!".into()
+            ))
+        }
+
+        // Return the 404 Not Found for other routes.
+        _ => {
+            Ok(Response::builder()
+               .status(StatusCode::NOT_FOUND)
+               .body("nothing here!\n".into())
+               .unwrap()
+            )
+        }
+    }
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
+    let addr = ([127, 0, 0, 1], 8000).into();
+
+    let service = make_service_fn(
+        |_| async {
+            Ok::<_, hyper::Error>(service_fn(echo))
+        }
+    );
+
+    let server = Server::bind(&addr).serve(service);
+
+    println!("Listening on http://{}", addr);
+
+    server.await?;
+
+    Ok(())
+}