From 3404b377d3b5478021308fd2bd968402d3228df9 Mon Sep 17 00:00:00 2001
From: asonix <asonix@asonix.dog>
Date: Sun, 18 Dec 2022 17:30:43 -0600
Subject: [PATCH] Initial doglinks

TODO
- style it at all
- rate limit
---
 .gitignore                |    4 +
 build.sh                  |    9 +
 client/elm.json           |   28 +
 client/src/CreatePage.elm |  103 +++
 client/src/Main.elm       |  152 ++++
 client/src/ShowPage.elm   |   81 ++
 server/Cargo.lock         | 1529 +++++++++++++++++++++++++++++++++++++
 server/Cargo.toml         |   15 +
 server/src/main.rs        |  184 +++++
 server/static/index.html  |   28 +
 10 files changed, 2133 insertions(+)
 create mode 100644 .gitignore
 create mode 100755 build.sh
 create mode 100644 client/elm.json
 create mode 100644 client/src/CreatePage.elm
 create mode 100644 client/src/Main.elm
 create mode 100644 client/src/ShowPage.elm
 create mode 100644 server/Cargo.lock
 create mode 100644 server/Cargo.toml
 create mode 100644 server/src/main.rs
 create mode 100644 server/static/index.html

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d3fcd36
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+/server/target
+/server/data
+/server/static/main.js
+/client/elm-stuff
diff --git a/build.sh b/build.sh
new file mode 100755
index 0000000..5eb60f3
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+
+pushd client
+elm make src/Main.elm --output=../server/static/main.js --optimize
+popd
+
+pushd server
+cargo build --release
+popd
diff --git a/client/elm.json b/client/elm.json
new file mode 100644
index 0000000..d23066e
--- /dev/null
+++ b/client/elm.json
@@ -0,0 +1,28 @@
+{
+    "type": "application",
+    "source-directories": [
+        "src"
+    ],
+    "elm-version": "0.19.1",
+    "dependencies": {
+        "direct": {
+            "NoRedInk/elm-json-decode-pipeline": "1.0.1",
+            "elm/browser": "1.0.2",
+            "elm/core": "1.0.5",
+            "elm/html": "1.0.0",
+            "elm/http": "2.0.0",
+            "elm/json": "1.1.3",
+            "elm/url": "1.0.0"
+        },
+        "indirect": {
+            "elm/bytes": "1.0.8",
+            "elm/file": "1.0.5",
+            "elm/time": "1.0.0",
+            "elm/virtual-dom": "1.0.3"
+        }
+    },
+    "test-dependencies": {
+        "direct": {},
+        "indirect": {}
+    }
+}
diff --git a/client/src/CreatePage.elm b/client/src/CreatePage.elm
new file mode 100644
index 0000000..220577f
--- /dev/null
+++ b/client/src/CreatePage.elm
@@ -0,0 +1,103 @@
+module CreatePage exposing (Model, Msg, init, update, view)
+
+import Browser.Navigation as Nav
+import Html exposing (Html, text)
+import Html.Attributes as Attr
+import Html.Events as Events
+import Http
+import Json.Decode as Decode exposing (Decoder)
+import Json.Decode.Pipeline exposing (required)
+import Json.Encode as Encode
+
+
+type alias Model =
+    { link : String
+    , error : Maybe String
+    }
+
+
+init : Model
+init =
+    { link = ""
+    , error = Nothing
+    }
+
+
+view : Model -> Html Msg
+view model =
+    Html.div []
+        [ Html.form [ Events.onSubmit (ClickedCreate model.link) ]
+            [ Html.input [ Attr.type_ "text", Events.onInput LinkUpdated ] []
+            , Html.button [ Attr.type_ "submit" ] [ text "Create doglink" ]
+            ]
+        , case model.error of
+            Just error ->
+                viewError error
+
+            Nothing ->
+                text ""
+        ]
+
+
+viewError : String -> Html msg
+viewError error =
+    Html.div []
+        [ Html.h3 [] [ text "Couldn't create doglink" ]
+        , Html.p [] [ text error ]
+        ]
+
+
+type Msg
+    = ClickedCreate String
+    | LinkUpdated String
+    | GotUuid (Result Http.Error String)
+
+
+update : String -> Nav.Key -> Msg -> Model -> ( Model, Cmd Msg )
+update origin key msg model =
+    case msg of
+        ClickedCreate link ->
+            ( model, createLink origin model )
+
+        LinkUpdated link ->
+            ( { model | link = link }, Cmd.none )
+
+        GotUuid (Ok uuid) ->
+            ( model, Nav.pushUrl key ("/" ++ uuid) )
+
+        GotUuid (Err error) ->
+            case error of
+                Http.BadUrl url ->
+                    ( { model | error = Just ("Bad url: " ++ url) }, Cmd.none )
+
+                Http.Timeout ->
+                    ( { model | error = Just "Request timed out" }, Cmd.none )
+
+                Http.NetworkError ->
+                    ( { model | error = Just "Couldn't talk to server" }, Cmd.none )
+
+                Http.BadStatus int ->
+                    ( { model | error = Just ("Server responded with invalid status: " ++ String.fromInt int) }, Cmd.none )
+
+                Http.BadBody body ->
+                    ( { model | error = Just ("Server responed with unexpected data: " ++ body) }, Cmd.none )
+
+
+createLink : String -> Model -> Cmd Msg
+createLink origin model =
+    Http.post
+        { url = origin ++ "/link"
+        , body = Http.jsonBody (encodeLink model.link)
+        , expect = Http.expectJson GotUuid uuidDecoder
+        }
+
+
+uuidDecoder : Decoder String
+uuidDecoder =
+    Decode.succeed identity
+        |> required "uuid" Decode.string
+
+
+encodeLink : String -> Encode.Value
+encodeLink link =
+    Encode.object [ ( "url", Encode.string link ) ]
diff --git a/client/src/Main.elm b/client/src/Main.elm
new file mode 100644
index 0000000..41488e9
--- /dev/null
+++ b/client/src/Main.elm
@@ -0,0 +1,152 @@
+module Main exposing (..)
+
+import Browser exposing (Document)
+import Browser.Navigation as Nav
+import CreatePage
+import Html exposing (Html, text)
+import ShowPage
+import Url exposing (Url)
+import Url.Parser as Parser exposing (Parser)
+
+
+type alias Model =
+    { origin : String
+    , key : Nav.Key
+    , page : Page
+    }
+
+
+type Route
+    = Create
+    | Show String
+
+
+type Page
+    = CreatePage CreatePage.Model
+    | ShowPage ShowPage.Model
+
+
+view : Model -> Document Msg
+view model =
+    { title = "Doglinks"
+    , body =
+        [ Html.h1 [] [ text "Doglinks" ]
+        , Html.p [] [ text "Create your doglinks here" ]
+        , case model.page of
+            CreatePage page ->
+                CreatePage.view page
+                    |> Html.map CreateMsg
+
+            ShowPage page ->
+                ShowPage.view model.origin page
+                    |> Html.map ShowMsg
+        ]
+    }
+
+
+init : String -> Url -> Nav.Key -> ( Model, Cmd Msg )
+init origin url key =
+    let
+        initialModel =
+            { origin = origin, key = key, page = CreatePage CreatePage.init }
+    in
+    updateUrl url initialModel
+
+
+type Msg
+    = ClickedLink Browser.UrlRequest
+    | ChangedUrl Url
+    | CreateMsg CreatePage.Msg
+    | ShowMsg ShowPage.Msg
+
+
+update : Msg -> Model -> ( Model, Cmd Msg )
+update msg model =
+    case msg of
+        ClickedLink (Browser.Internal url) ->
+            ( model, Nav.pushUrl model.key <| Url.toString url )
+
+        ClickedLink _ ->
+            ( model, Cmd.none )
+
+        ChangedUrl url ->
+            updateUrl url model
+
+        CreateMsg createMsg ->
+            case model.page of
+                CreatePage page ->
+                    let
+                        ( pageModel, pageMsg ) =
+                            CreatePage.update model.origin model.key createMsg page
+                    in
+                    ( { model | page = CreatePage pageModel }, Cmd.map CreateMsg pageMsg )
+
+                _ ->
+                    ( model, Cmd.none )
+
+        ShowMsg showMsg ->
+            case model.page of
+                ShowPage page ->
+                    let
+                        ( pageModel, pageMsg ) =
+                            ShowPage.update model.key showMsg page
+                    in
+                    ( { model | page = ShowPage pageModel }, Cmd.map ShowMsg pageMsg )
+
+                _ ->
+                    ( model, Cmd.none )
+
+
+updateUrl : Url -> Model -> ( Model, Cmd Msg )
+updateUrl url model =
+    case Parser.parse routeParser url of
+        Just (Show uuid) ->
+            toShow model ( ShowPage.init uuid, Cmd.none )
+
+        _ ->
+            toCreate model ( CreatePage.init, Cmd.none )
+
+
+toShow : Model -> ( ShowPage.Model, Cmd ShowPage.Msg ) -> ( Model, Cmd Msg )
+toShow model ( showModel, showMsg ) =
+    case model.page of
+        ShowPage _ ->
+            ( model, Cmd.none )
+
+        _ ->
+            ( { model | page = ShowPage showModel }, Cmd.map ShowMsg showMsg )
+
+
+toCreate : Model -> ( CreatePage.Model, Cmd CreatePage.Msg ) -> ( Model, Cmd Msg )
+toCreate model ( createModel, createMsg ) =
+    case model.page of
+        CreatePage _ ->
+            ( model, Cmd.none )
+
+        _ ->
+            ( { model | page = CreatePage createModel }, Cmd.map CreateMsg createMsg )
+
+
+subscriptions : Model -> Sub Msg
+subscriptions _ =
+    Sub.map ShowMsg ShowPage.subscriptions
+
+
+main : Program String Model Msg
+main =
+    Browser.application
+        { init = init
+        , subscriptions = subscriptions
+        , update = update
+        , view = view
+        , onUrlRequest = ClickedLink
+        , onUrlChange = ChangedUrl
+        }
+
+
+routeParser : Parser (Route -> a) a
+routeParser =
+    Parser.oneOf
+        [ Parser.map Create Parser.top
+        , Parser.map Show Parser.string
+        ]
diff --git a/client/src/ShowPage.elm b/client/src/ShowPage.elm
new file mode 100644
index 0000000..a7933fa
--- /dev/null
+++ b/client/src/ShowPage.elm
@@ -0,0 +1,81 @@
+port module ShowPage exposing (Model, Msg, init, subscriptions, update, view)
+
+import Browser
+import Browser.Navigation as Nav
+import Html exposing (Html, text)
+import Html.Attributes as Attr
+import Html.Events as Events
+import Process
+import Task
+
+
+type alias Model =
+    { copied : Bool
+    , uuid : String
+    }
+
+
+init : String -> Model
+init uuid =
+    { copied = False
+    , uuid = uuid
+    }
+
+
+view : String -> Model -> Html Msg
+view origin model =
+    let
+        dogLink =
+            origin ++ "/link/" ++ model.uuid
+    in
+    Html.div []
+        [ Html.h3 [] [ text "Doglink created!" ]
+        , Html.div []
+            [ Html.input [ Attr.type_ "text", Attr.id "copy-doglink", Attr.value dogLink ] []
+            , Html.a [ Attr.href "#", Events.onClick ClickedCopy ]
+                [ if model.copied then
+                    text "Copied!"
+
+                  else
+                    text "Copy"
+                ]
+            ]
+        , Html.div []
+            [ Html.a [ Attr.href "/" ] [ text "Return Home" ]
+            ]
+        ]
+
+
+type Msg
+    = ClickedCopy
+    | LinkCopied
+    | ExpiredCopy
+
+
+update : Nav.Key -> Msg -> Model -> ( Model, Cmd Msg )
+update key msg model =
+    case msg of
+        ClickedCopy ->
+            ( model, copyLink ())
+
+        LinkCopied ->
+            ( { model | copied = True }, expireCopy )
+
+        ExpiredCopy ->
+            ( { model | copied = False }, Cmd.none )
+
+
+expireCopy : Cmd Msg
+expireCopy =
+    Task.perform (\_ -> ExpiredCopy) (Process.sleep 3000)
+
+
+port copyLink : () -> Cmd msg
+
+
+port linkCopied : (() -> msg) -> Sub msg
+
+
+subscriptions : Sub Msg
+subscriptions =
+    linkCopied (\_ -> LinkCopied)
diff --git a/server/Cargo.lock b/server/Cargo.lock
new file mode 100644
index 0000000..2361ba2
--- /dev/null
+++ b/server/Cargo.lock
@@ -0,0 +1,1529 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
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+dependencies = [
+ "bitflags",
+ "bytes",
+ "futures-core",
+ "futures-sink",
+ "log",
+ "memchr",
+ "pin-project-lite",
+ "tokio",
+ "tokio-util",
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+ "actix-web",
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+ "bytes",
+ "derive_more",
+ "futures-core",
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+ "syn",
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+
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+dependencies = [
+ "libc",
+ "zstd-sys",
+]
+
+[[package]]
+name = "zstd-sys"
+version = "2.0.4+zstd.1.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4fa202f2ef00074143e219d15b62ffc317d17cc33909feac471c044087cad7b0"
+dependencies = [
+ "cc",
+ "libc",
+]
diff --git a/server/Cargo.toml b/server/Cargo.toml
new file mode 100644
index 0000000..ea8d32f
--- /dev/null
+++ b/server/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "doglinks"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+actix-web = "4"
+actix-web-lab = { version = "0.18.8", features = ["spa"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+sled = "0.34.7"
+url = { version = "2", features = ["serde"] }
+uuid = { version = "1", features = ["serde", "v4"] }
diff --git a/server/src/main.rs b/server/src/main.rs
new file mode 100644
index 0000000..7ffe927
--- /dev/null
+++ b/server/src/main.rs
@@ -0,0 +1,184 @@
+use actix_web::{
+    body::MessageBody,
+    dev::{ServiceRequest, ServiceResponse},
+    error::{ErrorBadRequest, ErrorInternalServerError},
+    http::header::LOCATION,
+    web::{self, Json, Path},
+    App, HttpResponse, HttpServer,
+};
+use actix_web_lab::{
+    middleware::{from_fn, Next},
+    web::spa,
+};
+use sled::{CompareAndSwapError, Config, Db, Tree};
+use std::collections::BTreeSet;
+use url::Url;
+use uuid::Uuid;
+
+#[derive(Clone)]
+struct State {
+    link_tree: Tree,
+    uuid_tree: Tree,
+    _db: Db,
+}
+
+impl State {
+    fn build(db: Db) -> sled::Result<Self> {
+        Ok(State {
+            link_tree: db.open_tree("doglinks-link-tree")?,
+            uuid_tree: db.open_tree("doglinks-uuid-tree")?,
+            _db: db,
+        })
+    }
+}
+
+type StateValue = BTreeSet<Uuid>;
+
+impl State {
+    async fn save_link(&self, link: Url) -> sled::Result<Uuid> {
+        let link_tree = self.link_tree.clone();
+        let uuid_tree = self.uuid_tree.clone();
+
+        web::block(move || {
+            let uuid = Uuid::new_v4();
+
+            uuid_tree.insert(uuid.as_bytes(), link.as_str())?;
+
+            let mut old = link_tree.get(link.as_str())?;
+
+            loop {
+                let new = old
+                    .clone()
+                    .and_then(|ivec| serde_json::from_slice(&ivec).ok())
+                    .or_else(|| Some(StateValue::new()))
+                    .map(|mut bts: StateValue| {
+                        bts.insert(uuid);
+                        bts
+                    })
+                    .and_then(|bts| serde_json::to_vec(&bts).ok());
+
+                match link_tree.compare_and_swap(link.to_string(), old, new)? {
+                    Ok(_) => return Ok(uuid),
+                    Err(CompareAndSwapError {
+                        current,
+                        proposed: _,
+                    }) => {
+                        old = current;
+                    }
+                }
+            }
+        })
+        .await
+        .expect("db panicked")
+    }
+
+    async fn get_link(&self, uuid: Uuid) -> sled::Result<Option<Url>> {
+        let uuid_tree = self.uuid_tree.clone();
+
+        web::block(move || {
+            Ok(uuid_tree
+                .get(uuid.as_bytes())?
+                .and_then(|url| String::from_utf8_lossy(&url).parse().ok()))
+        })
+        .await
+        .expect("db panicked")
+    }
+}
+
+#[derive(serde::Deserialize)]
+struct Link {
+    url: Url,
+}
+
+async fn new_link(
+    Json(Link { url }): Json<Link>,
+    state: web::Data<State>,
+) -> actix_web::Result<HttpResponse> {
+    let uuid = state
+        .save_link(url)
+        .await
+        .map_err(ErrorInternalServerError)?;
+
+    Ok(HttpResponse::Ok().json(serde_json::json!({ "uuid": uuid })))
+}
+
+async fn link_to(path: Path<Uuid>, state: web::Data<State>) -> actix_web::Result<HttpResponse> {
+    let url = state
+        .get_link(path.into_inner())
+        .await
+        .map_err(ErrorInternalServerError)?;
+
+    if let Some(url) = url {
+        Ok(HttpResponse::SeeOther()
+            .insert_header((LOCATION, url.to_string()))
+            .json(serde_json::json!({ "url": url })))
+    } else {
+        Ok(HttpResponse::NotFound().finish())
+    }
+}
+
+#[derive(Debug)]
+struct MissingUserAgent;
+
+impl std::fmt::Display for MissingUserAgent {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "No User-Agent header provided")
+    }
+}
+
+impl std::error::Error for MissingUserAgent {}
+
+#[derive(Debug)]
+struct DisallowedUserAgent;
+
+impl std::fmt::Display for DisallowedUserAgent {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "User-Agent header is not acceptable")
+    }
+}
+
+impl std::error::Error for DisallowedUserAgent {}
+
+async fn deny_invalid_agents(
+    req: ServiceRequest,
+    next: Next<impl MessageBody>,
+) -> actix_web::Result<ServiceResponse<impl MessageBody>> {
+    let user_agent = req
+        .headers()
+        .get("user-agent")
+        .ok_or_else(|| ErrorBadRequest(MissingUserAgent))?;
+    let parsed = user_agent.to_str().map_err(ErrorBadRequest)?;
+
+    if parsed.to_lowercase().contains("twitter") {
+        return Err(ErrorBadRequest(DisallowedUserAgent));
+    }
+
+    next.call(req).await
+}
+
+#[actix_web::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let db = Config::new().path("./data/sled-0-34").open()?;
+
+    let state = State::build(db)?;
+
+    HttpServer::new(move || {
+        App::new()
+            .app_data(web::Data::new(state.clone()))
+            .wrap(from_fn(deny_invalid_agents))
+            .route("/link", web::post().to(new_link))
+            .route("/link/{uuid}", web::get().to(link_to))
+            .service(
+                spa()
+                    .index_file("./static/index.html")
+                    .static_resources_mount("/static")
+                    .static_resources_location("./static")
+                    .finish(),
+            )
+    })
+    .bind(("0.0.0.0", 8078))?
+    .run()
+    .await?;
+
+    Ok(())
+}
diff --git a/server/static/index.html b/server/static/index.html
new file mode 100644
index 0000000..bde8de8
--- /dev/null
+++ b/server/static/index.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+  <meta charset="utf-8">
+  <title>Doglinks</title>
+  <script src="/static/main.js"></script>
+</head>
+
+<body>
+  <div id="app">
+  </div>
+  <script>
+    const app = Elm.Main.init({
+      node: document.getElementById("app"),
+      flags: window.location.origin,
+    });
+
+    app.ports.copyLink.subscribe(() => {
+      console.log("copy");
+      document.querySelector("#copy-doglink").select();
+      document.execCommand("copy");
+      app.ports.linkCopied.send(null);
+    });
+  </script>
+</body>
+
+</html>