Merge pull request #534 from PluralKit/rust-api

rust skeleton

.dockerignore

@@ -3,19 +3,26 @@
 
 # Include project code and build files
 !PluralKit.*/
-!gateway/
+!services/
-!myriad_rs/
+!lib/
 !Myriad/
-!PluralKit.sln
-!nuget.config
 !.git
 !proto
-!scripts/run-clustered.sh
 !dashboard
-!scheduled_tasks
+
+!Cargo.toml
+!Cargo.lock
+!PluralKit.sln
+!nuget.config
+
+# used for target binary builds
+!.docker-bin/
 
 # Re-exclude host build artifact directories
 **/bin
 **/obj
 **/target
 **/node_modules
+
+# don't clear docker cache when updating dockerfiles
+Dockerfile

.github/workflows/gateway.yml

@@ -1,35 +0,0 @@
-name: Build gateway Docker image
-
-on:
-  push:
-    branches: [main]
-    paths:
-      - 'gateway/**'
-      - 'proto/**'
-
-jobs:
-  deploy:
-    runs-on: ubuntu-latest
-    permissions:
-      packages: write
-    if: github.repository == 'PluralKit/PluralKit'
-    steps:
-      - uses: docker/login-action@v1
-        with:
-          registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.CR_PAT }}
-      - uses: actions/checkout@v2
-      - run: echo "BRANCH_NAME=${GITHUB_REF#refs/heads/}" >> $GITHUB_ENV
-      - uses: docker/build-push-action@v2
-        with:
-          # https://github.com/docker/build-push-action/issues/378
-          context: .
-          file: gateway/Dockerfile
-          push: true
-          tags: |
-            ghcr.io/pluralkit/gateway:${{ env.BRANCH_NAME }}
-            ghcr.io/pluralkit/gateway:${{ github.sha }}
-            ghcr.io/pluralkit/gateway:latest
-          cache-from: type=registry,ref=ghcr.io/pluralkit/gateway:${{ env.BRANCH_NAME }}
-          cache-to: type=inline

.github/workflows/rust.yml

@@ -0,0 +1,55 @@
+# todo: use https://github.com/jpribyl/action-docker-layer-caching
+# todo: make this generic for all Rust images in this repo
+# todo: don't use docker/build-push-action
+# todo: run builds on pull request
+
+name: Build and push API Docker image
+on:
+  push:
+    branches:
+      - main
+    paths:
+    - 'lib/pklib/**'
+    - 'services/api/**'
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+    if: github.repository == 'PluralKit/PluralKit'
+    steps:
+      - uses: docker/login-action@v1
+        if: ${{ !env.ACT }}
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.CR_PAT }}
+
+      - uses: actions/checkout@v2
+      - uses: docker/setup-buildx-action@v1
+
+      # main docker build
+      - run: echo "BRANCH_NAME=${GITHUB_REF#refs/heads/}" >> $GITHUB_ENV
+      - uses: docker/build-push-action@v2
+        with:
+          # https://github.com/docker/build-push-action/issues/378
+          context: .
+          file: Dockerfile.rust
+          push: false 
+          cache-from: type=gha
+          cache-to: type=gha
+          outputs: .docker-bin
+
+      # add more binaries here
+      - run: |
+          for binary in "api"; do
+            for tag in latest ${{ env.BRANCH_NAME }} ${{ github.sha }}; do
+              cat Dockerfile.bin | sed "s/__BINARY__/$binary/g" | docker build -t ghcr.io/pluralkit/$binary:$tag -f - .
+            done
+            if [ "${{ github.repository }}" == "PluralKit/PluralKit" ]; then
+              docker push ghcr.io/pluralkit/$binary:${{ env.BRANCH_NAME }}
+              docker push ghcr.io/pluralkit/$binary:${{ github.sha }}
+              [ "${{ env.BRANCH_NAME }}" == "main" ] && docker push ghcr.io/pluralkit/$binary:latest
+            fi
+          done

.gitignore

@@ -26,3 +26,5 @@ pluralkit.*.conf
 # Generated
 logs/
 .version
+recipe.json
+.docker-bin/

Cargo.toml

@@ -0,0 +1,14 @@
+[workspace]
+members = [
+    "./lib/libpk",
+    "./services/api"
+]
+
+[workspace.dependencies]
+anyhow = "1"
+fred = { version = "5.2.0", default-features = false, features = ["tracing", "pool-prefer-active"] }
+lazy_static = "1.4.0"
+metrics = "0.20.1"
+serde = "1.0.152"
+tokio = { version = "1.25.0", features = ["full"] }
+tracing = "0.1.37"

Dockerfile.bin

@@ -0,0 +1,5 @@
+FROM alpine:latest
+
+COPY /.docker-bin/__BINARY__ /bin/__BINARY__
+
+CMD ["/bin/__BINARY__"]

Dockerfile.rust

@@ -0,0 +1,34 @@
+FROM alpine:latest AS builder
+
+WORKDIR /build
+
+RUN apk add rustup build-base
+# todo: arm64 target
+RUN rustup-init --default-host x86_64-unknown-linux-musl --default-toolchain stable --profile default -y
+
+ENV PATH=/root/.cargo/bin:$PATH
+ENV RUSTFLAGS='-C link-arg=-s'
+
+RUN cargo install cargo-chef --locked
+
+# build dependencies first to cache
+FROM builder AS recipe-builder
+COPY . .
+RUN cargo chef prepare --recipe-path recipe.json
+
+FROM builder AS binary-builder
+COPY --from=recipe-builder /build/recipe.json recipe.json
+RUN cargo chef cook --release --recipe-path recipe.json --target x86_64-unknown-linux-musl
+
+COPY Cargo.toml /build/
+COPY Cargo.lock /build/
+
+# this needs to match workspaces in Cargo.toml
+COPY lib/libpk /build/lib/libpk
+COPY services/api/ /build/services/api
+
+RUN cargo build --bin api --release --target x86_64-unknown-linux-musl
+
+FROM scratch 
+
+COPY --from=binary-builder /build/target/x86_64-unknown-linux-musl/release/api /api

dashboard/main.go

@@ -3,9 +3,11 @@ package main
 import (
 	"embed"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"html"
 	"io"
+	_fs "io/fs"
 	"net/http"
 	"strings"
 
@@ -78,13 +80,22 @@ func notFoundHandler(rw http.ResponseWriter, r *http.Request) {
 		data = []byte(strings.Replace(string(data), `<!-- extra data -->`, defaultEmbed+versionJS, 1))
 	}
 
-	if err != nil {
+	if errors.Is(err, _fs.ErrNotExist) {
+		rw.WriteHeader(http.StatusNotFound)
+	} else if err != nil {
 		rw.WriteHeader(http.StatusInternalServerError)
-		return
+	} else {
+		// cache built+hashed dashboard js/css files forever
+		is_dash_static_asset := strings.HasPrefix(r.URL.Path, "/assets/") &&
+			(strings.HasSuffix(r.URL.Path, ".js") || strings.HasSuffix(r.URL.Path, ".css") || strings.HasSuffix(r.URL.Path, ".map"))
+
+		if is_dash_static_asset {
+			rw.Header().Add("Cache-Control", "max-age=31536000, s-maxage=31536000, immutable")
 		}
 
 		rw.Write(data)
 	}
+}
 
 // explanation for createEmbed:
 // we don't care about errors, we just want to return a HTML page as soon as possible

go.work.sum

@@ -0,0 +1,2 @@
+github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
+google.golang.org/protobuf v1.28.1 h1:d0NfwRgPtno5B1Wa6L2DAG+KivqkdutMf1UhdNx175w=

lib/libpk/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "libpk"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+anyhow = { workspace = true } 
+config = "0.13.3"
+gethostname = "0.4.1"
+lazy_static = { workspace = true }
+metrics = { workspace = true }
+metrics-exporter-prometheus = { version = "0.11.0", default-features = false, features = ["tokio", "http-listener", "tracing"] }
+serde = { workspace = true }
+tokio = { workspace = true }
+tracing = { workspace = true }
+tracing-gelf = "0.7.1"
+tracing-subscriber = { version = "0.3.16", features = ["env-filter"] }

lib/libpk/src/_config.rs

@@ -0,0 +1,60 @@
+use config::Config;
+use lazy_static::lazy_static;
+use serde::Deserialize;
+use std::sync::Arc;
+
+#[derive(Deserialize, Debug)]
+pub struct DiscordConfig {
+    pub client_id: u32,
+    pub bot_token: String,
+    pub client_secret: String,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct DatabaseConfig {
+    pub(crate) _data_db_uri: String,
+    pub(crate) _messages_db_uri: String,
+    pub(crate) _db_password: Option<String>,
+    pub data_redis_addr: String,
+}
+
+fn _default_api_addr() -> String {
+    "0.0.0.0:5000".to_string()
+}
+
+#[derive(Deserialize, Debug)]
+pub struct ApiConfig {
+    #[serde(default = "_default_api_addr")]
+    pub addr: String,
+
+    #[serde(default)]
+    pub ratelimit_redis_addr: Option<String>,
+
+    pub remote_url: String,
+
+    #[serde(default)]
+    pub temp_token2: Option<String>,
+}
+
+fn _metrics_default() -> bool {
+    false
+}
+
+#[derive(Deserialize, Debug)]
+pub struct PKConfig {
+    pub discord: DiscordConfig,
+    pub api: ApiConfig,
+
+    #[serde(default = "_metrics_default")]
+    pub run_metrics_server: bool,
+
+    pub(crate) gelf_log_url: Option<String>,
+}
+
+lazy_static! {
+    #[derive(Debug)]
+    pub static ref CONFIG: Arc<PKConfig> = Arc::new(Config::builder()
+    .add_source(config::Environment::with_prefix("pluralkit").separator("__"))
+    .build().unwrap()
+    .try_deserialize::<PKConfig>().unwrap());
+}

lib/libpk/src/lib.rs

@@ -0,0 +1,37 @@
+use gethostname::gethostname;
+use metrics_exporter_prometheus::PrometheusBuilder;
+use tracing_subscriber::{prelude::__tracing_subscriber_SubscriberExt, EnvFilter, Registry};
+
+mod _config;
+pub use crate::_config::CONFIG as config;
+
+pub fn init_logging(component: &str) -> anyhow::Result<()> {
+    let subscriber = Registry::default()
+        .with(EnvFilter::from_default_env())
+        .with(tracing_subscriber::fmt::layer());
+
+    if let Some(gelf_url) = &config.gelf_log_url {
+        let gelf_logger = tracing_gelf::Logger::builder()
+            .additional_field("component", component)
+            .additional_field("hostname", gethostname().to_str());
+        let mut conn_handle = gelf_logger
+            .init_udp_with_subscriber(gelf_url, subscriber)
+            .unwrap();
+        tokio::spawn(async move { conn_handle.connect().await });
+    } else {
+        // gelf_logger internally sets the global subscriber
+        tracing::subscriber::set_global_default(subscriber)
+            .expect("unable to set global subscriber");
+    }
+
+    Ok(())
+}
+
+pub fn init_metrics() -> anyhow::Result<()> {
+    if config.run_metrics_server {
+        // automatically spawns a http listener at :9000
+        let builder = PrometheusBuilder::new();
+        builder.install()?;
+    }
+    Ok(())
+}

services/api/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "api"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+anyhow = { workspace = true } 
+axum = "0.6.4"
+fred = { workspace = true }
+http = "0.2.8"
+hyper-reverse-proxy = "0.5.1"
+lazy_static = { workspace = true }
+libpk = { path = "../../lib/libpk" }
+metrics = { workspace = true }
+tokio = { workspace = true }
+tower = "0.4.13"
+tracing = { workspace = true }

services/api/src/main.rs

@@ -0,0 +1,86 @@
+use axum::{
+    routing::{delete, get, patch, post},
+    Router,
+};
+use tracing::info;
+
+mod middleware;
+mod util;
+
+// this function is manually formatted for easier legibility of routes
+#[rustfmt::skip]
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    libpk::init_logging("api")?;
+    libpk::init_metrics()?;
+    info!("hello world");
+
+    // processed upside down (???) so we have to put middleware at the end
+    let app = Router::new()
+        .route("/v2/systems/:system_id", get(util::rproxy))
+        .route("/v2/systems/:system_id", patch(util::rproxy))
+        .route("/v2/systems/:system_id/settings", get(util::rproxy))
+        .route("/v2/systems/:system_id/settings", patch(util::rproxy))
+
+        .route("/v2/systems/:system_id/members", get(util::rproxy))
+        .route("/v2/members", post(util::rproxy))
+        .route("/v2/members/:member_id", get(util::rproxy))
+        .route("/v2/members/:member_id", patch(util::rproxy))
+        .route("/v2/members/:member_id", delete(util::rproxy))
+
+        .route("/v2/systems/:system_id/groups", get(util::rproxy))
+        .route("/v2/groups", post(util::rproxy))
+        .route("/v2/groups/:group_id", get(util::rproxy))
+        .route("/v2/groups/:group_id", patch(util::rproxy))
+        .route("/v2/groups/:group_id", delete(util::rproxy))
+
+        .route("/v2/groups/:group_id/members", get(util::rproxy))
+        .route("/v2/groups/:group_id/members/add", post(util::rproxy))
+        .route("/v2/groups/:group_id/members/remove", post(util::rproxy))
+        .route("/v2/groups/:group_id/members/overwrite", post(util::rproxy))
+
+        .route("/v2/members/:member_id/groups", get(util::rproxy))
+        .route("/v2/members/:member_id/groups/add", post(util::rproxy))
+        .route("/v2/members/:member_id/groups/remove", post(util::rproxy))
+        .route("/v2/members/:member_id/groups/overwrite", post(util::rproxy))
+
+        .route("/v2/systems/:system_id/switches", get(util::rproxy))
+        .route("/v2/systems/:system_id/switches", post(util::rproxy))
+        .route("/v2/systems/:system_id/fronters", get(util::rproxy))
+
+        .route("/v2/systems/:system_id/switches/:switch_id", get(util::rproxy))
+        .route("/v2/systems/:system_id/switches/:switch_id", patch(util::rproxy))
+        .route("/v2/systems/:system_id/switches/:switch_id/members", patch(util::rproxy))
+        .route("/v2/systems/:system_id/switches/:switch_id", delete(util::rproxy))
+
+        .route("/v2/systems/:system_id/guilds/:guild_id", get(util::rproxy))
+        .route("/v2/systems/:system_id/guilds/:guild_id", patch(util::rproxy))
+
+        .route("/v2/members/:member_id/guilds/:guild_id", get(util::rproxy))
+        .route("/v2/members/:member_id/guilds/:guild_id", patch(util::rproxy))
+
+        .route("/v2/messages/:message_id", get(util::rproxy))
+
+        .route("/private/meta", get(util::rproxy))
+        .route("/private/bulk_privacy/member", post(util::rproxy))
+        .route("/private/bulk_privacy/group", post(util::rproxy))
+        .route("/private/discord/callback", post(util::rproxy))
+
+        .route("/v2/systems/:system_id/oembed.json", get(util::rproxy))
+        .route("/v2/members/:member_id/oembed.json", get(util::rproxy))
+        .route("/v2/groups/:group_id/oembed.json", get(util::rproxy))
+
+        .layer(axum::middleware::from_fn(middleware::logger))
+        .layer(middleware::ratelimit::ratelimiter(middleware::ratelimit::do_request_ratelimited)) // this sucks
+        .layer(axum::middleware::from_fn(middleware::ignore_invalid_routes))
+        .layer(axum::middleware::from_fn(middleware::cors))
+
+        .route("/", get(|| async { axum::response::Redirect::to("https://pluralkit.me/api") }));
+
+    let addr: &str = libpk::config.api.addr.as_ref();
+    axum::Server::bind(&addr.parse()?)
+        .serve(app.into_make_service())
+        .await?;
+
+    Ok(())
+}

services/api/src/middleware/cors.rs

@@ -0,0 +1,26 @@
+use axum::{
+    http::{HeaderMap, HeaderValue, Method, Request, StatusCode},
+    middleware::Next,
+    response::{IntoResponse, Response},
+};
+
+#[rustfmt::skip]
+fn add_cors_headers(headers: &mut HeaderMap) {
+    headers.append("Access-Control-Allow-Origin", HeaderValue::from_static("*"));
+    headers.append("Access-Control-Allow-Methods", HeaderValue::from_static("*"));
+    headers.append("Access-Control-Allow-Credentials", HeaderValue::from_static("true"));
+    headers.append("Access-Control-Allow-Headers", HeaderValue::from_static("Content-Type, Authorization, sentry-trace, User-Agent"));
+    headers.append("Access-Control-Max-Age", HeaderValue::from_static("86400"));
+}
+
+pub async fn cors<B>(request: Request<B>, next: Next<B>) -> Response {
+    let mut response = if request.method() == Method::OPTIONS {
+        StatusCode::OK.into_response()
+    } else {
+        next.run(request).await
+    };
+
+    add_cors_headers(response.headers_mut());
+
+    response
+}

services/api/src/middleware/ignore_invalid_routes.rs

@@ -0,0 +1,61 @@
+use axum::{
+    extract::MatchedPath,
+    http::{Request, StatusCode},
+    middleware::Next,
+    response::{IntoResponse, Response},
+};
+
+use crate::util::header_or_unknown;
+
+fn is_trying_to_use_v1_path_on_v2(path: &str) -> bool {
+    path.starts_with("/v2/s/")
+        || path.starts_with("/v2/m/")
+        || path.starts_with("/v2/a/")
+        || path.starts_with("/v2/msg/")
+        || path == "/v2/s"
+        || path == "/v2/m"
+}
+
+pub async fn ignore_invalid_routes<B>(request: Request<B>, next: Next<B>) -> Response {
+    let path = request
+        .extensions()
+        .get::<MatchedPath>()
+        .cloned()
+        .map(|v| v.as_str().to_string())
+        .unwrap_or("unknown".to_string());
+    let user_agent = header_or_unknown(request.headers().get("User-Agent"));
+
+    if request.uri().path().starts_with("/v1") {
+        (
+            StatusCode::GONE,
+            r#"{"message":"Unsupported API version","code":0}"#,
+        )
+            .into_response()
+    } else if is_trying_to_use_v1_path_on_v2(request.uri().path()) {
+        (
+            StatusCode::BAD_REQUEST,
+            r#"{"message":"Invalid path for API version","code":0}"#,
+        )
+            .into_response()
+    }
+    // we ignored v1 routes earlier, now let's ignore all non-v2 routes
+    else if !request.uri().clone().path().starts_with("/v2") {
+        return (
+            StatusCode::BAD_REQUEST,
+            r#"{"message":"Unsupported API version","code":0}"#,
+        )
+            .into_response();
+    } else if path == "unknown" {
+        // current prod api responds with 404 with empty body to invalid endpoints
+        // just doing that here as well but i'm not sure if it's the correct behaviour
+        return StatusCode::NOT_FOUND.into_response();
+    }
+    // yes, technically because of how we parse headers this will break for user-agents literally set to "unknown"
+    // but "unknown" isn't really a valid user-agent
+    else if user_agent == "unknown" {
+        // please set a valid user-agent
+        return StatusCode::BAD_REQUEST.into_response();
+    } else {
+        next.run(request).await
+    }
+}

services/api/src/middleware/logger.rs

@@ -0,0 +1,60 @@
+use std::time::Instant;
+
+use axum::{extract::MatchedPath, http::Request, middleware::Next, response::Response};
+use metrics::histogram;
+use tracing::{info, span, warn, Instrument, Level};
+
+use crate::util::header_or_unknown;
+
+// log any requests that take longer than 2 seconds
+// todo: change as necessary
+const MIN_LOG_TIME: u128 = 2_000;
+
+pub async fn logger<B>(request: Request<B>, next: Next<B>) -> Response {
+    let method = request.method().clone();
+
+    let request_id = header_or_unknown(request.headers().get("Fly-Request-Id"));
+    let remote_ip = header_or_unknown(request.headers().get("Fly-Client-IP"));
+    let user_agent = header_or_unknown(request.headers().get("User-Agent"));
+
+    let endpoint = request
+        .extensions()
+        .get::<MatchedPath>()
+        .cloned()
+        .map(|v| v.as_str().to_string())
+        .unwrap_or("unknown".to_string());
+
+    let uri = request.uri().clone();
+
+    let request_id_span = span!(
+        Level::INFO,
+        "request",
+        request_id,
+        remote_ip,
+        method = method.as_str(),
+        endpoint = endpoint.clone(),
+        user_agent
+    );
+
+    let start = Instant::now();
+    let response = next.run(request).instrument(request_id_span).await;
+    let elapsed = start.elapsed().as_millis();
+
+    info!(
+        "handled request for {} {} in {}ms",
+        method, endpoint, elapsed
+    );
+    histogram!("pk_http_requests", (elapsed as f64) / 1_000_f64, "method" => method.to_string(), "endpoint" => endpoint.clone());
+
+    if elapsed > MIN_LOG_TIME {
+        warn!(
+            "request to {} full path {} (endpoint {}) took a long time ({}ms)!",
+            method,
+            uri.path(),
+            endpoint,
+            elapsed
+        )
+    }
+
+    response
+}

services/api/src/middleware/mod.rs

@@ -0,0 +1,11 @@
+mod cors;
+
+pub use cors::cors;
+
+mod logger;
+pub use logger::logger;
+
+mod ignore_invalid_routes;
+pub use ignore_invalid_routes::ignore_invalid_routes;
+
+pub mod ratelimit;

services/api/src/middleware/ratelimit.lua

@@ -0,0 +1,62 @@
+-- this script has side-effects, so it requires replicate commands mode
+-- redis.replicate_commands()
+
+local rate_limit_key = KEYS[1]
+local burst = ARGV[1]
+local rate = ARGV[2]
+local period = ARGV[3]
+
+-- we're only ever asking for 1 request at a time
+local cost = 1 --local cost = tonumber(ARGV[4])
+
+local emission_interval = period / rate
+local increment = emission_interval * cost
+local burst_offset = emission_interval * burst
+
+-- redis returns time as an array containing two integers: seconds of the epoch
+-- time (10 digits) and microseconds (6 digits). for convenience we need to
+-- convert them to a floating point number. the resulting number is 16 digits,
+-- bordering on the limits of a 64-bit double-precision floating point number.
+-- adjust the epoch to be relative to Jan 1, 2017 00:00:00 GMT to avoid floating
+-- point problems. this approach is good until "now" is 2,483,228,799 (Wed, 09
+-- Sep 2048 01:46:39 GMT), when the adjusted value is 16 digits.
+local jan_1_2017 = 1483228800
+local now = redis.call("TIME")
+now = (now[1] - jan_1_2017) + (now[2] / 1000000)
+
+local tat = redis.call("GET", rate_limit_key)
+
+if not tat then
+    tat = now
+else
+    tat = tonumber(tat)
+end
+
+tat = math.max(tat, now)
+
+local new_tat = tat + increment
+local allow_at = new_tat - burst_offset
+
+local diff = now - allow_at
+local remaining = diff / emission_interval
+
+if remaining < 0 then
+    local reset_after = tat - now
+    local retry_after = diff * -1
+    return {
+        0, -- remaining
+        tostring(retry_after),
+        reset_after,
+    }
+end
+
+local reset_after = new_tat - now
+if reset_after > 0 then
+    redis.call("SET", rate_limit_key, new_tat, "EX", math.ceil(reset_after))
+end
+local retry_after = -1
+return {
+    remaining,
+    tostring(retry_after),
+    reset_after
+}

services/api/src/middleware/ratelimit.rs

@@ -0,0 +1,164 @@
+use std::time::{Duration, SystemTime};
+
+use axum::{
+    extract::State,
+    http::Request,
+    middleware::{FromFnLayer, Next},
+    response::Response,
+};
+use fred::{pool::RedisPool, prelude::LuaInterface, types::ReconnectPolicy, util::sha1_hash};
+use http::{HeaderValue, StatusCode};
+use metrics::increment_counter;
+use tracing::{debug, error, info, warn};
+
+use crate::util::{header_or_unknown, json_err};
+
+const LUA_SCRIPT: &str = include_str!("ratelimit.lua");
+
+lazy_static::lazy_static! {
+    static ref LUA_SCRIPT_SHA: String = sha1_hash(LUA_SCRIPT);
+}
+
+// this is awful but it works
+pub fn ratelimiter<F, T>(f: F) -> FromFnLayer<F, Option<RedisPool>, T> {
+    let redis = libpk::config.api.ratelimit_redis_addr.as_ref().map(|val| {
+        let r = fred::pool::RedisPool::new(
+            fred::types::RedisConfig::from_url_centralized(val.as_ref())
+                .expect("redis url is invalid"),
+            10,
+        )
+        .expect("failed to connect to redis");
+
+        let handle = r.connect(Some(ReconnectPolicy::default()));
+
+        tokio::spawn(async move { handle });
+
+        let rscript = r.clone();
+        tokio::spawn(async move {
+            if let Ok(()) = rscript.wait_for_connect().await {
+                match rscript.script_load(LUA_SCRIPT).await {
+                    Ok(_) => info!("connected to redis for request rate limiting"),
+                    Err(err) => error!("could not load redis script: {}", err),
+                }
+            } else {
+                error!("could not wait for connection to load redis script!");
+            }
+        });
+
+        r
+    });
+
+    if redis.is_none() {
+        warn!("running without request rate limiting!");
+    }
+
+    axum::middleware::from_fn_with_state(redis, f)
+}
+
+pub async fn do_request_ratelimited<B>(
+    State(redis): State<Option<RedisPool>>,
+    request: Request<B>,
+    next: Next<B>,
+) -> Response {
+    if let Some(redis) = redis {
+        let headers = request.headers().clone();
+        let source_ip = header_or_unknown(headers.get("Fly-Client-IP"));
+
+        // https://github.com/rust-lang/rust/issues/53667
+        let (rl_key, rate) = if let Some(header) = request.headers().clone().get("X-PluralKit-App")
+        {
+            if let Some(token2) = &libpk::config.api.temp_token2 {
+                if header.to_str().unwrap_or("invalid") == token2 {
+                    ("token2", 20)
+                } else {
+                    (source_ip, 2)
+                }
+            } else {
+                (source_ip, 2)
+            }
+        } else {
+            (source_ip, 2)
+        };
+
+        let burst = 5;
+        let period = 1; // seconds
+
+        // todo: make this static
+        // though even if it's not static, it's probably cheaper than sending the entire script to redis every time
+        let scriptsha = sha1_hash(&LUA_SCRIPT);
+
+        // local rate_limit_key = KEYS[1]
+        // local burst = ARGV[1]
+        // local rate = ARGV[2]
+        // local period = ARGV[3]
+        // return {remaining, tostring(retry_after), reset_after}
+        let resp = redis
+            .evalsha::<(i32, String, u64), String, Vec<&str>, Vec<i32>>(
+                scriptsha,
+                vec![rl_key],
+                vec![burst, rate, period],
+            )
+            .await;
+
+        match resp {
+            Ok((mut remaining, retry_after, reset_after)) => {
+                // redis's lua doesn't support returning floats
+                let retry_after: f64 = retry_after
+                    .parse()
+                    .expect("got something that isn't a f64 from redis");
+
+                let mut response = if remaining > 0 {
+                    next.run(request).await
+                } else {
+                    let retry_after = (retry_after * 1_000_f64).ceil() as u64;
+                    debug!("ratelimited request from {rl_key}, retry_after={retry_after}");
+                    increment_counter!("pk_http_requests_ratelimited");
+                    json_err(
+                        StatusCode::TOO_MANY_REQUESTS,
+                        format!(
+                            r#"{{"message":"429: too many requests","retry_after":{retry_after},"code":0}}"#,
+                        ),
+                    )
+                };
+
+                // the redis script puts burst in remaining for ??? some reason
+                remaining -= burst - rate;
+
+                let reset_time = SystemTime::now()
+                    .checked_add(Duration::from_secs(reset_after))
+                    .expect("invalid timestamp")
+                    .duration_since(std::time::UNIX_EPOCH)
+                    .expect("invalid duration")
+                    .as_secs();
+
+                let headers = response.headers_mut();
+                headers.insert(
+                    "X-RateLimit-Limit",
+                    HeaderValue::from_str(format!("{}", rate).as_str())
+                        .expect("invalid header value"),
+                );
+                headers.insert(
+                    "X-RateLimit-Remaining",
+                    HeaderValue::from_str(format!("{}", remaining).as_str())
+                        .expect("invalid header value"),
+                );
+                headers.insert(
+                    "X-RateLimit-Reset",
+                    HeaderValue::from_str(format!("{}", reset_time).as_str())
+                        .expect("invalid header value"),
+                );
+
+                return response;
+            }
+            Err(err) => {
+                tracing::error!("error getting ratelimit info: {}", err);
+                return json_err(
+                    StatusCode::INTERNAL_SERVER_ERROR,
+                    r#"{"message": "500: internal server error", "code": 0}"#.to_string(),
+                );
+            }
+        }
+    }
+
+    next.run(request).await
+}

services/api/src/util.rs

@@ -0,0 +1,42 @@
+use axum::{
+    body::Body,
+    http::{HeaderValue, Request, Response, StatusCode, Uri},
+    response::IntoResponse,
+};
+use tracing::error;
+
+pub fn header_or_unknown(header: Option<&HeaderValue>) -> &str {
+    if let Some(value) = header {
+        match value.to_str() {
+            Ok(v) => v,
+            Err(err) => {
+                error!("failed to parse header value {:#?}: {:#?}", value, err);
+                "failed to parse"
+            }
+        }
+    } else {
+        "unknown"
+    }
+}
+
+pub async fn rproxy(req: Request<Body>) -> Response<Body> {
+    let uri = Uri::from_static(&libpk::config.api.remote_url).to_string();
+
+    match hyper_reverse_proxy::call("0.0.0.0".parse().unwrap(), &uri[..uri.len() - 1], req).await {
+        Ok(response) => response,
+        Err(error) => {
+            error!("error proxying request: {:?}", error);
+            Response::builder()
+                .status(StatusCode::INTERNAL_SERVER_ERROR)
+                .body(Body::empty())
+                .unwrap()
+        }
+    }
+}
+
+pub fn json_err(code: StatusCode, text: String) -> axum::response::Response {
+    let mut response = (code, text).into_response();
+    let headers = response.headers_mut();
+    headers.insert("content-type", HeaderValue::from_static("application/json"));
+    response
+}

services/web-proxy/go.mod

@@ -1,18 +1,3 @@
 module web-proxy
 
 go 1.19
-
-require (
-	github.com/beorn7/perks v1.0.1 // indirect
-	github.com/cespare/xxhash/v2 v2.1.2 // indirect
-	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
-	github.com/go-redis/redis/v8 v8.11.5 // indirect
-	github.com/golang/protobuf v1.5.2 // indirect
-	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
-	github.com/prometheus/client_golang v1.14.0 // indirect
-	github.com/prometheus/client_model v0.3.0 // indirect
-	github.com/prometheus/common v0.37.0 // indirect
-	github.com/prometheus/procfs v0.8.0 // indirect
-	golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a // indirect
-	google.golang.org/protobuf v1.28.1 // indirect
-)

services/web-proxy/go.sum

@@ -1,482 +0,0 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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-cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
-cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
-cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
-cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
-cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
-cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
-cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
-cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
-cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
-cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
-cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
-cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
-cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
-cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
-cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
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-google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
-google.golang.org/grpc v1.27.1/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
-google.golang.org/grpc v1.28.0/go.mod h1:rpkK4SK4GF4Ach/+MFLZUBavHOvF2JJB5uozKKal+60=
-google.golang.org/grpc v1.29.1/go.mod h1:itym6AZVZYACWQqET3MqgPpjcuV5QH3BxFS3IjizoKk=
-google.golang.org/grpc v1.30.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
-google.golang.org/grpc v1.31.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
-google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
-google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
-google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
-google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
-google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
-google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
-google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
-google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
-google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.28.1 h1:d0NfwRgPtno5B1Wa6L2DAG+KivqkdutMf1UhdNx175w=
-google.golang.org/protobuf v1.28.1/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
-gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
-gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
-honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
-honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
-honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
-rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
-rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
-rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=

services/web-proxy/main.go

@@ -2,25 +2,22 @@ package main
 
 import (
 	"context"
-	"encoding/json"
+	"log"
-	"fmt"
 	"net/http"
 	"net/http/httputil"
-	"strconv"
+	"net/url"
-	"strings"
 	"time"
-
-	"github.com/go-redis/redis/v8"
-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/client_golang/prometheus/promhttp"
-
-	"web-proxy/redis_rate"
 )
 
-var limiter *redis_rate.Limiter
+func proxyTo(host string) *httputil.ReverseProxy {
-
+	rp := httputil.NewSingleHostReverseProxy(&url.URL{
-// todo: be able to raise ratelimits for >1 consumers
+		Scheme:   "http",
-var token2 string
+		Host:     host,
+		RawQuery: "",
+	})
+	rp.ModifyResponse = logTimeElapsed
+	return rp
+}
 
 // todo: this shouldn't be in this repo
 var remotes = map[string]*httputil.ReverseProxy{
@@ -30,22 +27,6 @@ var remotes = map[string]*httputil.ReverseProxy{
 	"grafana.pluralkit.me": proxyTo("[fdaa:0:ae33:a7b:8dd7:0:a:802]:3000"),
 }
 
-func init() {
-	redisHost := requireEnv("REDIS_HOST")
-	redisPassword := requireEnv("REDIS_PASSWORD")
-
-	rdb := redis.NewClient(&redis.Options{
-		Addr:     redisHost,
-		Username: "default",
-		Password: redisPassword,
-	})
-	limiter = redis_rate.NewLimiter(rdb)
-
-	token2 = requireEnv("TOKEN2")
-
-	remotes["dash.pluralkit.me"].ModifyResponse = modifyDashResponse
-}
-
 type ProxyHandler struct{}
 
 func (p ProxyHandler) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
@@ -56,53 +37,6 @@ func (p ProxyHandler) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if r.Host == "api.pluralkit.me" {
-		// root
-		if r.URL.Path == "" || r.URL.Path == "/" {
-			// api root path redirects to docs
-			http.Redirect(rw, r, "https://pluralkit.me/api/", http.StatusFound)
-			return
-		}
-
-		// CORS headers
-		rw.Header().Add("Access-Control-Allow-Origin", "*")
-		rw.Header().Add("Access-Control-Allow-Methods", "*")
-		rw.Header().Add("Access-Control-Allow-Credentials", "true")
-		rw.Header().Add("Access-Control-Allow-Headers", "Content-Type, Authorization, sentry-trace, User-Agent")
-		rw.Header().Add("Access-Control-Max-Age", "86400")
-
-		if r.Header.Get("User-Agent") == "" {
-			// please set a valid user-agent
-			rw.Header().Set("content-type", "application/json")
-			rw.WriteHeader(400)
-			rw.Write([]byte(`{"message":"A valid User-Agent header is required.","code":0}`))
-			return
-		}
-
-		if r.Method == http.MethodOptions {
-			rw.WriteHeader(200)
-			return
-		}
-
-		if strings.HasPrefix(r.URL.Path, "/v1") {
-			rw.Header().Set("content-type", "application/json")
-			rw.WriteHeader(410)
-			rw.Write([]byte(`{"message":"Unsupported API version","code":0}`))
-			return
-		}
-
-		if is_trying_to_use_v1_path_on_v2(r.URL.Path) {
-			rw.Header().Set("content-type", "application/json")
-			rw.WriteHeader(400)
-			rw.Write([]byte(`{"message":"Invalid path for API version","code":0}`))
-			return
-		}
-
-		if is_api_ratelimited(rw, r) {
-			return
-		}
-	}
-
 	startTime := time.Now()
 	r = r.WithContext(context.WithValue(r.Context(), "req-time", startTime))
 
@@ -115,49 +49,12 @@ func logTimeElapsed(resp *http.Response) error {
 	startTime := r.Context().Value("req-time").(time.Time)
 
 	elapsed := time.Since(startTime)
-	metric.With(map[string]string{
-		"domain": r.Host,
-		"method": r.Method,
-		"status": strconv.Itoa(resp.StatusCode),
-		"route":  cleanPath(r.Host, r.URL.Path),
-	}).Observe(elapsed.Seconds())
 
-	log, _ := json.Marshal(map[string]interface{}{
+	log.Printf("[%s] \"%s %s%s\" %d - %vms %s\n", r.Header.Get("Fly-Client-IP"), r.Method, r.Host, r.URL.Path, resp.StatusCode, elapsed.Milliseconds(), r.Header.Get("User-Agent"))
-		"remote_ip":   r.Header.Get("Fly-Client-IP"),
-		"method":      r.Method,
-		"host":        r.Host,
-		"route":       r.URL.Path,
-		"route_clean": cleanPath(r.Host, r.URL.Path),
-		"status":      resp.StatusCode,
-		"elapsed":     elapsed.Milliseconds(),
-		"user_agent":  r.Header.Get("User-Agent"),
-	})
-	fmt.Println(string(log))
-
-	// log.Printf("[%s] \"%s %s%s\" %d - %vms %s\n", r.Header.Get("Fly-Client-IP"), r.Method, r.Host, r.URL.Path, resp.StatusCode, elapsed.Milliseconds(), r.Header.Get("User-Agent"))
 
 	return nil
 }
 
-func modifyDashResponse(resp *http.Response) error {
-	r := resp.Request
-
-	// cache built+hashed dashboard js/css files forever
-	is_dash_static_asset := strings.HasPrefix(r.URL.Path, "/assets/") &&
-		(strings.HasSuffix(r.URL.Path, ".js") || strings.HasSuffix(r.URL.Path, ".css") || strings.HasSuffix(r.URL.Path, ".map"))
-
-	if is_dash_static_asset && resp.StatusCode == 200 {
-		resp.Header.Add("Cache-Control", "max-age=31536000, s-maxage=31536000, immutable")
-	}
-
-	return logTimeElapsed(resp)
-}
-
 func main() {
-	prometheus.MustRegister(metric)
-
-	http.Handle("/metrics", promhttp.Handler())
-	go http.ListenAndServe(":9091", nil)
-
 	http.ListenAndServe(":8080", ProxyHandler{})
 }

services/web-proxy/rate_limit.go

@@ -1,43 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"net/http"
-	"time"
-
-	"web-proxy/redis_rate"
-)
-
-func is_api_ratelimited(rw http.ResponseWriter, r *http.Request) bool {
-	var limit int
-	var key string
-
-	if r.Header.Get("X-PluralKit-App") == token2 {
-		limit = 20
-		key = "token2"
-	} else {
-		limit = 2
-		key = r.Header.Get("Fly-Client-IP")
-	}
-
-	res, err := limiter.Allow(r.Context(), "ratelimit:"+key, redis_rate.Limit{
-		Period: time.Second,
-		Rate:   limit,
-		Burst:  5,
-	})
-	if err != nil {
-		panic(err)
-	}
-
-	rw.Header().Set("X-RateLimit-Limit", fmt.Sprint(limit))
-	rw.Header().Set("X-RateLimit-Remaining", fmt.Sprint(res.Remaining))
-	rw.Header().Set("X-RateLimit-Reset", fmt.Sprint(time.Now().Add(res.ResetAfter).UnixNano()/1_000_000))
-
-	if res.Allowed < 1 {
-		rw.WriteHeader(429)
-		rw.Write([]byte(`{"message":"429: too many requests","retry_after":` + fmt.Sprint(res.RetryAfter.Milliseconds()) + `,"code":0}`))
-		return true
-	}
-
-	return false
-}

services/web-proxy/redis_rate/LICENSE

@@ -1,25 +0,0 @@
-Copyright (c) 2013 The github.com/go-redis/redis_rate Authors.
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
-   * Redistributions of source code must retain the above copyright
-notice, this list of conditions and the following disclaimer.
-   * Redistributions in binary form must reproduce the above
-copyright notice, this list of conditions and the following disclaimer
-in the documentation and/or other materials provided with the
-distribution.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

services/web-proxy/redis_rate/lua.go

@@ -1,140 +0,0 @@
-package redis_rate
-
-import "github.com/go-redis/redis/v8"
-
-// pluralkit changes:
-// fly's hosted redis doesn't support replicate commands
-// we can remove it since it's a single host
-
-// Copyright (c) 2017 Pavel Pravosud
-// https://github.com/rwz/redis-gcra/blob/master/vendor/perform_gcra_ratelimit.lua
-var allowN = redis.NewScript(`
--- this script has side-effects, so it requires replicate commands mode
--- redis.replicate_commands()
-
-local rate_limit_key = KEYS[1]
-local burst = ARGV[1]
-local rate = ARGV[2]
-local period = ARGV[3]
-local cost = tonumber(ARGV[4])
-
-local emission_interval = period / rate
-local increment = emission_interval * cost
-local burst_offset = emission_interval * burst
-
--- redis returns time as an array containing two integers: seconds of the epoch
--- time (10 digits) and microseconds (6 digits). for convenience we need to
--- convert them to a floating point number. the resulting number is 16 digits,
--- bordering on the limits of a 64-bit double-precision floating point number.
--- adjust the epoch to be relative to Jan 1, 2017 00:00:00 GMT to avoid floating
--- point problems. this approach is good until "now" is 2,483,228,799 (Wed, 09
--- Sep 2048 01:46:39 GMT), when the adjusted value is 16 digits.
-local jan_1_2017 = 1483228800
-local now = redis.call("TIME")
-now = (now[1] - jan_1_2017) + (now[2] / 1000000)
-
-local tat = redis.call("GET", rate_limit_key)
-
-if not tat then
-  tat = now
-else
-  tat = tonumber(tat)
-end
-
-tat = math.max(tat, now)
-
-local new_tat = tat + increment
-local allow_at = new_tat - burst_offset
-
-local diff = now - allow_at
-local remaining = diff / emission_interval
-
-if remaining < 0 then
-  local reset_after = tat - now
-  local retry_after = diff * -1
-  return {
-    0, -- allowed
-    0, -- remaining
-    tostring(retry_after),
-    tostring(reset_after),
-  }
-end
-
-local reset_after = new_tat - now
-if reset_after > 0 then
-  redis.call("SET", rate_limit_key, new_tat, "EX", math.ceil(reset_after))
-end
-local retry_after = -1
-return {cost, remaining, tostring(retry_after), tostring(reset_after)}
-`)
-
-var allowAtMost = redis.NewScript(`
--- this script has side-effects, so it requires replicate commands mode
--- redis.replicate_commands()
-
-local rate_limit_key = KEYS[1]
-local burst = ARGV[1]
-local rate = ARGV[2]
-local period = ARGV[3]
-local cost = tonumber(ARGV[4])
-
-local emission_interval = period / rate
-local burst_offset = emission_interval * burst
-
--- redis returns time as an array containing two integers: seconds of the epoch
--- time (10 digits) and microseconds (6 digits). for convenience we need to
--- convert them to a floating point number. the resulting number is 16 digits,
--- bordering on the limits of a 64-bit double-precision floating point number.
--- adjust the epoch to be relative to Jan 1, 2017 00:00:00 GMT to avoid floating
--- point problems. this approach is good until "now" is 2,483,228,799 (Wed, 09
--- Sep 2048 01:46:39 GMT), when the adjusted value is 16 digits.
-local jan_1_2017 = 1483228800
-local now = redis.call("TIME")
-now = (now[1] - jan_1_2017) + (now[2] / 1000000)
-
-local tat = redis.call("GET", rate_limit_key)
-
-if not tat then
-  tat = now
-else
-  tat = tonumber(tat)
-end
-
-tat = math.max(tat, now)
-
-local diff = now - (tat - burst_offset)
-local remaining = diff / emission_interval
-
-if remaining < 1 then
-  local reset_after = tat - now
-  local retry_after = emission_interval - diff
-  return {
-    0, -- allowed
-    0, -- remaining
-    tostring(retry_after),
-    tostring(reset_after),
-  }
-end
-
-if remaining < cost then
-  cost = remaining
-  remaining = 0
-else
-  remaining = remaining - cost
-end
-
-local increment = emission_interval * cost
-local new_tat = tat + increment
-
-local reset_after = new_tat - now
-if reset_after > 0 then
-  redis.call("SET", rate_limit_key, new_tat, "EX", math.ceil(reset_after))
-end
-
-return {
-  cost,
-  remaining,
-  tostring(-1),
-  tostring(reset_after),
-}
-`)

services/web-proxy/redis_rate/rate.go

@@ -1,198 +0,0 @@
-package redis_rate
-
-import (
-	"context"
-	"fmt"
-	"strconv"
-	"time"
-
-	"github.com/go-redis/redis/v8"
-)
-
-const redisPrefix = "rate:"
-
-type rediser interface {
-	Eval(ctx context.Context, script string, keys []string, args ...interface{}) *redis.Cmd
-	EvalSha(ctx context.Context, sha1 string, keys []string, args ...interface{}) *redis.Cmd
-	ScriptExists(ctx context.Context, hashes ...string) *redis.BoolSliceCmd
-	ScriptLoad(ctx context.Context, script string) *redis.StringCmd
-	Del(ctx context.Context, keys ...string) *redis.IntCmd
-}
-
-type Limit struct {
-	Rate   int
-	Burst  int
-	Period time.Duration
-}
-
-func (l Limit) String() string {
-	return fmt.Sprintf("%d req/%s (burst %d)", l.Rate, fmtDur(l.Period), l.Burst)
-}
-
-func (l Limit) IsZero() bool {
-	return l == Limit{}
-}
-
-func fmtDur(d time.Duration) string {
-	switch d {
-	case time.Second:
-		return "s"
-	case time.Minute:
-		return "m"
-	case time.Hour:
-		return "h"
-	}
-	return d.String()
-}
-
-func PerSecond(rate int) Limit {
-	return Limit{
-		Rate:   rate,
-		Period: time.Second,
-		Burst:  rate,
-	}
-}
-
-func PerMinute(rate int) Limit {
-	return Limit{
-		Rate:   rate,
-		Period: time.Minute,
-		Burst:  rate,
-	}
-}
-
-func PerHour(rate int) Limit {
-	return Limit{
-		Rate:   rate,
-		Period: time.Hour,
-		Burst:  rate,
-	}
-}
-
-//------------------------------------------------------------------------------
-
-// Limiter controls how frequently events are allowed to happen.
-type Limiter struct {
-	rdb rediser
-}
-
-// NewLimiter returns a new Limiter.
-func NewLimiter(rdb rediser) *Limiter {
-	return &Limiter{
-		rdb: rdb,
-	}
-}
-
-// Allow is a shortcut for AllowN(ctx, key, limit, 1).
-func (l Limiter) Allow(ctx context.Context, key string, limit Limit) (*Result, error) {
-	return l.AllowN(ctx, key, limit, 1)
-}
-
-// AllowN reports whether n events may happen at time now.
-func (l Limiter) AllowN(
-	ctx context.Context,
-	key string,
-	limit Limit,
-	n int,
-) (*Result, error) {
-	values := []interface{}{limit.Burst, limit.Rate, limit.Period.Seconds(), n}
-	v, err := allowN.Run(ctx, l.rdb, []string{redisPrefix + key}, values...).Result()
-	if err != nil {
-		return nil, err
-	}
-
-	values = v.([]interface{})
-
-	retryAfter, err := strconv.ParseFloat(values[2].(string), 64)
-	if err != nil {
-		return nil, err
-	}
-
-	resetAfter, err := strconv.ParseFloat(values[3].(string), 64)
-	if err != nil {
-		return nil, err
-	}
-
-	res := &Result{
-		Limit:      limit,
-		Allowed:    int(values[0].(int64)),
-		Remaining:  int(values[1].(int64)),
-		RetryAfter: dur(retryAfter),
-		ResetAfter: dur(resetAfter),
-	}
-	return res, nil
-}
-
-// AllowAtMost reports whether at most n events may happen at time now.
-// It returns number of allowed events that is less than or equal to n.
-func (l Limiter) AllowAtMost(
-	ctx context.Context,
-	key string,
-	limit Limit,
-	n int,
-) (*Result, error) {
-	values := []interface{}{limit.Burst, limit.Rate, limit.Period.Seconds(), n}
-	v, err := allowAtMost.Run(ctx, l.rdb, []string{redisPrefix + key}, values...).Result()
-	if err != nil {
-		return nil, err
-	}
-
-	values = v.([]interface{})
-
-	retryAfter, err := strconv.ParseFloat(values[2].(string), 64)
-	if err != nil {
-		return nil, err
-	}
-
-	resetAfter, err := strconv.ParseFloat(values[3].(string), 64)
-	if err != nil {
-		return nil, err
-	}
-
-	res := &Result{
-		Limit:      limit,
-		Allowed:    int(values[0].(int64)),
-		Remaining:  int(values[1].(int64)),
-		RetryAfter: dur(retryAfter),
-		ResetAfter: dur(resetAfter),
-	}
-	return res, nil
-}
-
-// Reset gets a key and reset all limitations and previous usages
-func (l *Limiter) Reset(ctx context.Context, key string) error {
-	return l.rdb.Del(ctx, redisPrefix+key).Err()
-}
-
-func dur(f float64) time.Duration {
-	if f == -1 {
-		return -1
-	}
-	return time.Duration(f * float64(time.Second))
-}
-
-type Result struct {
-	// Limit is the limit that was used to obtain this result.
-	Limit Limit
-
-	// Allowed is the number of events that may happen at time now.
-	Allowed int
-
-	// Remaining is the maximum number of requests that could be
-	// permitted instantaneously for this key given the current
-	// state. For example, if a rate limiter allows 10 requests per
-	// second and has already received 6 requests for this key this
-	// second, Remaining would be 4.
-	Remaining int
-
-	// RetryAfter is the time until the next request will be permitted.
-	// It should be -1 unless the rate limit has been exceeded.
-	RetryAfter time.Duration
-
-	// ResetAfter is the time until the RateLimiter returns to its
-	// initial state for a given key. For example, if a rate limiter
-	// manages requests per second and received one request 200ms ago,
-	// Reset would return 800ms. You can also think of this as the time
-	// until Limit and Remaining will be equal.
-	ResetAfter time.Duration
-}

services/web-proxy/util.go

@@ -1,74 +0,0 @@
-package main
-
-import (
-	"net/http/httputil"
-	"net/url"
-	"os"
-	"regexp"
-	"strings"
-
-	"github.com/prometheus/client_golang/prometheus"
-)
-
-var metric = prometheus.NewHistogramVec(
-	prometheus.HistogramOpts{
-		Name:    "pk_http_requests",
-		Buckets: []float64{.1, .25, 1, 2.5, 5, 20},
-	},
-	[]string{"domain", "method", "status", "route"},
-)
-
-func proxyTo(host string) *httputil.ReverseProxy {
-	rp := httputil.NewSingleHostReverseProxy(&url.URL{
-		Scheme:   "http",
-		Host:     host,
-		RawQuery: "",
-	})
-	rp.ModifyResponse = logTimeElapsed
-	return rp
-}
-
-var systemsRegex = regexp.MustCompile("systems/[^/{}]+")
-var membersRegex = regexp.MustCompile("members/[^/{}]+")
-var groupsRegex = regexp.MustCompile("groups/[^/{}]+")
-var switchesRegex = regexp.MustCompile("switches/[^/{}]+")
-var guildsRegex = regexp.MustCompile("guilds/[^/{}]+")
-var messagesRegex = regexp.MustCompile("messages/[^/{}]+")
-
-func cleanPath(host, path string) string {
-	if host != "api.pluralkit.me" {
-		return ""
-	}
-
-	path = strings.ToLower(path)
-
-	if !(strings.HasPrefix(path, "/v2") || strings.HasPrefix(path, "/private")) {
-		return ""
-	}
-
-	path = systemsRegex.ReplaceAllString(path, "systems/{systemRef}")
-	path = membersRegex.ReplaceAllString(path, "members/{memberRef}")
-	path = groupsRegex.ReplaceAllString(path, "groups/{groupRef}")
-	path = switchesRegex.ReplaceAllString(path, "switches/{switchRef}")
-	path = guildsRegex.ReplaceAllString(path, "guilds/{guild_id}")
-	path = messagesRegex.ReplaceAllString(path, "messages/{message_id}")
-
-	return path
-}
-
-func requireEnv(key string) string {
-	if val, ok := os.LookupEnv(key); !ok {
-		panic("missing `" + key + "` in environment")
-	} else {
-		return val
-	}
-}
-
-func is_trying_to_use_v1_path_on_v2(path string) bool {
-	return strings.HasPrefix(path, "/v2/s/") ||
-		strings.HasPrefix(path, "/v2/m/") ||
-		strings.HasPrefix(path, "/v2/a/") ||
-		strings.HasPrefix(path, "/v2/msg/") ||
-		path == "/v2/s" ||
-		path == "/v2/m"
-}