2f6cf9c httpd: implement `git` fetch-only server — heartwood

Radicle Heartwood Protocol & Stack

httpd: implement `git` fetch-only server

Alexis Sellier committed 3 years ago

commit 2f6cf9c7a5dd87a73b2156302d6cd6bdf5b57dbd
parent 3bff9a9dc11764d9c5b5df18bec9b6e5be7c857f

7 files changed +1113 -2

modified Cargo.lock

@@ -3,6 +3,12 @@

 version = 3
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 source = "registry+https://github.com/rust-lang/crates.io-index"

@@ -30,6 +36,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"

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@@ -47,6 +64,66 @@ source = "registry+https://github.com/rust-lang/crates.io-index"

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@@ -143,6 +220,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"

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@@ -167,7 +250,7 @@ dependencies = [

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@@ -205,6 +288,15 @@ dependencies = [

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@@ -304,6 +396,22 @@ dependencies = [

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@@ -313,6 +421,45 @@ dependencies = [

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@@ -392,6 +539,25 @@ dependencies = [

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@@ -416,6 +582,70 @@ dependencies = [

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@@ -539,12 +769,54 @@ dependencies = [

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@@ -604,6 +876,16 @@ dependencies = [

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@@ -623,6 +905,25 @@ dependencies = [

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@@ -646,12 +947,50 @@ source = "registry+https://github.com/rust-lang/crates.io-index"

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@@ -781,6 +1120,25 @@ dependencies = [

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@@ -869,6 +1227,30 @@ dependencies = [

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@@ -965,12 +1347,36 @@ dependencies = [

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@@ -1022,6 +1428,12 @@ dependencies = [

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@@ -1056,6 +1468,15 @@ dependencies = [

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@@ -1067,6 +1488,17 @@ dependencies = [

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@@ -1082,6 +1514,178 @@ source = "registry+https://github.com/rust-lang/crates.io-index"

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 version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c20c8dbed6283a09604c3e69b4b7eeb54e298b8a600d4d5ecb5ad39de609f1d0"
 [[package]]
 name = "tower-service"
 version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b6bc1c9ce2b5135ac7f93c72918fc37feb872bdc6a5533a8b85eb4b86bfdae52"
 [[package]]
 name = "tracing"
 version = "0.1.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ce8c33a8d48bd45d624a6e523445fd21ec13d3653cd51f681abf67418f54eb8"
 dependencies = [
  "cfg-if",
  "log",
  "pin-project-lite",
  "tracing-attributes",
  "tracing-core",
 ]
 [[package]]
 name = "tracing-attributes"
 version = "0.1.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4017f8f45139870ca7e672686113917c71c7a6e02d4924eda67186083c03081a"
 dependencies = [
  "proc-macro2",
  "quote",
  "syn",
 ]
 [[package]]
 name = "tracing-core"
 version = "0.1.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "24eb03ba0eab1fd845050058ce5e616558e8f8d8fca633e6b163fe25c797213a"
 dependencies = [
  "once_cell",
  "valuable",
 ]
 [[package]]
 name = "tracing-log"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "78ddad33d2d10b1ed7eb9d1f518a5674713876e97e5bb9b7345a7984fbb4f922"
 dependencies = [
  "lazy_static",
  "log",
  "tracing-core",
 ]
 [[package]]
 name = "tracing-logfmt"
 version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c08aacc136419ba433b3f9bfd434a1bb62fe385328935e6ac11d952122b8a8cb"
 dependencies = [
  "time 0.3.15",
  "tracing",
  "tracing-core",
  "tracing-subscriber",
 ]
 [[package]]
 name = "tracing-subscriber"
 version = "0.3.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a6176eae26dd70d0c919749377897b54a9276bd7061339665dd68777926b5a70"
 dependencies = [
  "matchers",
  "nu-ansi-term",
  "once_cell",
  "regex",
  "sharded-slab",
  "smallvec",
  "thread_local",
  "tracing",
  "tracing-core",
  "tracing-log",
 ]
 [[package]]
 name = "try-lock"
 version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "59547bce71d9c38b83d9c0e92b6066c4253371f15005def0c30d9657f50c7642"
 [[package]]
 name = "typenum"
 version = "1.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"

@@ -1126,6 +1730,12 @@ dependencies = [

 ]
 [[package]]
 name = "valuable"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "830b7e5d4d90034032940e4ace0d9a9a057e7a45cd94e6c007832e39edb82f6d"
 [[package]]
 name = "vcpkg"
 version = "0.2.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"

@@ -1138,6 +1748,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"

 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 [[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 = "wasi"
 version = "0.10.0+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"

@@ -1226,6 +1846,49 @@ source = "registry+https://github.com/rust-lang/crates.io-index"

 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 [[package]]
 name = "windows-sys"
 version = "0.36.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ea04155a16a59f9eab786fe12a4a450e75cdb175f9e0d80da1e17db09f55b8d2"
 dependencies = [
  "windows_aarch64_msvc",
  "windows_i686_gnu",
  "windows_i686_msvc",
  "windows_x86_64_gnu",
  "windows_x86_64_msvc",
 ]
 [[package]]
 name = "windows_aarch64_msvc"
 version = "0.36.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9bb8c3fd39ade2d67e9874ac4f3db21f0d710bee00fe7cab16949ec184eeaa47"
 [[package]]
 name = "windows_i686_gnu"
 version = "0.36.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "180e6ccf01daf4c426b846dfc66db1fc518f074baa793aa7d9b9aaeffad6a3b6"
 [[package]]
 name = "windows_i686_msvc"
 version = "0.36.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e2e7917148b2812d1eeafaeb22a97e4813dfa60a3f8f78ebe204bcc88f12f024"
 [[package]]
 name = "windows_x86_64_gnu"
 version = "0.36.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4dcd171b8776c41b97521e5da127a2d86ad280114807d0b2ab1e462bc764d9e1"
 [[package]]
 name = "windows_x86_64_msvc"
 version = "0.36.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c811ca4a8c853ef420abd8592ba53ddbbac90410fab6903b3e79972a631f7680"
 [[package]]
 name = "zeroize"
 version = "1.5.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"

modified Cargo.toml

@@ -1,5 +1,12 @@

 [workspace]
 members = ["radicle", "radicle-node", "radicle-tools", "radicle-ssh", "radicle-remote-helper"]
 members = [
   "radicle",
   "radicle-node",
   "radicle-tools",
   "radicle-ssh",
   "radicle-remote-helper",
   "radicle-httpd"
 ]
 [patch.crates-io.nakamoto-net]
 git = "https://github.com/cloudhead/nakamoto"

added build.rs

@@ -0,0 +1,23 @@

 use std::process::Command;
 fn main() {
     // Set a build-time `GIT_HEAD` env var which includes the commit id;
     // such that we can tell which code is running.
     let hash = Command::new("git")
         .arg("rev-parse")
         .arg("--short")
         .arg("HEAD")
         .output()
         .ok()
         .and_then(|output| {
             if output.status.success() {
                 String::from_utf8(output.stdout).ok()
             } else {
                 None
             }
         })
         .unwrap_or_else(|| String::from("unknown"));
     println!("cargo:rustc-env=GIT_HEAD={}", hash);
     println!("cargo:rustc-rerun-if-changed=.git/HEAD");
 }

added radicle-httpd/Cargo.toml

@@ -0,0 +1,33 @@

 [package]
 name = "radicle-httpd"
 license = "MIT OR Apache-2.0"
 version = "0.1.0"
 authors = ["Alexis Sellier <alexis@radicle.xyz>"]
 edition = "2021"
 default-run = "radicle-httpd"
 build = "../build.rs"
 [features]
 default = []
 logfmt = [
   "tracing-logfmt",
   "tracing-subscriber/env-filter"
 ]
 [dependencies]
 anyhow = { version = "1" }
 flate2 = { version = "1" }
 lexopt = { version = "0.2.1" }
 thiserror = { version = "1" }
 tokio = { version = "1.21", default-features = false, features = ["macros", "rt-multi-thread"] }
 tracing = { version = "0.1.37", default-features = false, features = ["std", "log"] }
 tracing-subscriber = { version = "0.3", default-features = false, features = ["std", "ansi", "fmt"] }
 tracing-logfmt = { version = "0.2", optional = true }
 axum = { version = "0.5.16", default-features = false }
 axum-server = { version = "0.4.2", default-features = false }
 hyper = { version = "0.14.17", default-features = false }
 tower-http = { version = "0.3.4", default-features = false, features = ["trace"] }
 [dependencies.radicle]
 path = "../radicle"
 version = "0.2.0"

added radicle-httpd/src/error.rs

@@ -0,0 +1,52 @@

 use axum::http;
 use axum::response::{IntoResponse, Response};
 /// Errors relating to the HTTP backend.
 #[derive(Debug, thiserror::Error)]
 pub enum Error {
     /// I/O error.
     #[error("i/o error: {0}")]
     Io(#[from] std::io::Error),
     /// The service is not available.
     #[error("service '{0}' not available")]
     ServiceUnavailable(&'static str),
     /// Invalid identifier.
     #[error("invalid radicle identifier: {0}")]
     Id(#[from] radicle::identity::IdError),
     /// Git backend error.
     #[error("backend error")]
     Backend,
     /// Id is not valid.
     #[error("id is not valid")]
     InvalidId,
     /// HeaderName error.
     #[error(transparent)]
     InvalidHeaderName(#[from] axum::http::header::InvalidHeaderName),
     /// HeaderValue error.
     #[error(transparent)]
     InvalidHeaderValue(#[from] axum::http::header::InvalidHeaderValue),
 }
 impl Error {
     pub fn status(&self) -> http::StatusCode {
         match self {
             Error::ServiceUnavailable(_) => http::StatusCode::SERVICE_UNAVAILABLE,
             Error::InvalidId => http::StatusCode::NOT_FOUND,
             _ => http::StatusCode::INTERNAL_SERVER_ERROR,
         }
     }
 }
 impl IntoResponse for Error {
     fn into_response(self) -> Response {
         tracing::error!("{}", self);
         self.status().into_response()
     }
 }

added radicle-httpd/src/lib.rs

@@ -0,0 +1,251 @@

 #![allow(clippy::type_complexity)]
 #![allow(clippy::too_many_arguments)]
 pub mod error;
 use std::collections::HashMap;
 use std::io::prelude::*;
 use std::net::SocketAddr;
 use std::path::Path;
 use std::process::{Command, Stdio};
 use std::sync::Arc;
 use std::time::Duration;
 use std::{io, net, str};
 use anyhow::Context as _;
 use axum::body::Body;
 use axum::body::{BoxBody, Bytes};
 use axum::extract::{ConnectInfo, Path as AxumPath, RawQuery};
 use axum::http::header::HeaderName;
 use axum::http::HeaderMap;
 use axum::http::{Method, StatusCode};
 use axum::http::{Request, Response};
 use axum::response::IntoResponse;
 use axum::routing::any;
 use axum::{Extension, Router};
 use flate2::write::GzDecoder;
 use hyper::body::Buf as _;
 use tower_http::trace::TraceLayer;
 use tracing::Span;
 use radicle::identity::Id;
 use radicle::profile::Profile;
 use error::Error;
 pub const VERSION: &str = env!("CARGO_PKG_VERSION");
 #[derive(Debug, Clone)]
 pub struct Options {
     pub listen: net::SocketAddr,
 }
 /// Run the Git Server.
 pub async fn run(options: Options) -> anyhow::Result<()> {
     let git_version = Command::new("git")
         .arg("version")
         .output()
         .context("'git' command must be available")?
         .stdout;
     tracing::info!("{}", str::from_utf8(&git_version)?.trim());
     let profile = radicle::Profile::load()?;
     tracing::info!("using radicle home at {}", profile.home.display());
     let app = Router::new()
         .route("/:project/*request", any(git_handler))
         .layer(Extension(Arc::new(profile)))
         .layer(
             TraceLayer::new_for_http()
                 .make_span_with(|request: &Request<Body>| {
                     tracing::info_span!(
                         "request",
                         method = %request.method(),
                         uri = %request.uri(),
                         status = tracing::field::Empty,
                         latency = tracing::field::Empty,
                     )
                 })
                 .on_response(
                     |response: &Response<BoxBody>, latency: Duration, span: &Span| {
                         span.record("status", &tracing::field::debug(response.status()));
                         span.record("latency", &tracing::field::debug(latency));
                         tracing::info!("Processed");
                     },
                 ),
         )
         .into_make_service_with_connect_info::<SocketAddr>();
     tracing::info!("listening on http://{}", options.listen);
     axum::Server::bind(&options.listen)
         .serve(app)
         .await
         .map_err(anyhow::Error::from)
 }
 async fn git_handler(
     Extension(profile): Extension<Arc<Profile>>,
     AxumPath((project, request)): AxumPath<(String, String)>,
     method: Method,
     headers: HeaderMap,
     body: Bytes,
     ConnectInfo(remote): ConnectInfo<SocketAddr>,
     query: RawQuery,
 ) -> impl IntoResponse {
     let query = query.0.unwrap_or_default();
     let id: Id = project.strip_suffix(".git").unwrap_or(&project).parse()?;
     let (status, headers, body) =
         git_http_backend(&profile, method, headers, body, remote, id, &request, query).await?;
     let mut response_headers = HeaderMap::new();
     for (name, vec) in headers.iter() {
         for value in vec {
             let header: HeaderName = name.try_into()?;
             response_headers.insert(header, value.parse()?);
         }
     }
     Ok::<_, Error>((status, response_headers, body))
 }
 async fn git_http_backend(
     profile: &Profile,
     method: Method,
     headers: HeaderMap,
     mut body: Bytes,
     remote: net::SocketAddr,
     id: Id,
     path: &str,
     query: String,
 ) -> Result<(StatusCode, HashMap<String, Vec<String>>, Vec<u8>), Error> {
     let git_dir = radicle::storage::git::paths::repository(&profile.storage, &id);
     let content_type =
         if let Some(Ok(content_type)) = headers.get("Content-Type").map(|h| h.to_str()) {
             content_type
         } else {
             ""
         };
     // Reject push requests.
     match (path, query.as_str()) {
         ("git-receive-pack", _) | (_, "service=git-receive-pack") => {
             return Err(Error::ServiceUnavailable("git-receive-pack"));
         }
         _ => {}
     };
     tracing::debug!("id: {:?}", id);
     tracing::debug!("headers: {:?}", headers);
     tracing::debug!("path: {:?}", path);
     tracing::debug!("method: {:?}", method.as_str());
     tracing::debug!("remote: {:?}", remote.to_string());
     let mut cmd = Command::new("git");
     let mut child = cmd
         .arg("http-backend")
         .env("REQUEST_METHOD", method.as_str())
         .env("GIT_PROJECT_ROOT", git_dir)
         // "The GIT_HTTP_EXPORT_ALL environmental variable may be passed to git-http-backend to bypass
         // the check for the "git-daemon-export-ok" file in each repository before allowing export of
         // that repository."
         .env("GIT_HTTP_EXPORT_ALL", String::default())
         .env("PATH_INFO", Path::new("/").join(path))
         .env("CONTENT_TYPE", content_type)
         .env("QUERY_STRING", query)
         .stderr(Stdio::piped())
         .stdout(Stdio::piped())
         .stdin(Stdio::piped())
         .spawn()?;
     // Whether the request body is compressed.
     let gzip = matches!(
         headers.get("Content-Encoding").map(|h| h.to_str()),
         Some(Ok("gzip"))
     );
     {
         // This is safe because we captured the child's stdin.
         let mut stdin = child.stdin.take().unwrap();
         // Copy the request body to git-http-backend's stdin.
         if gzip {
             let mut decoder = GzDecoder::new(&mut stdin);
             let mut reader = body.reader();
             io::copy(&mut reader, &mut decoder)?;
             decoder.finish()?;
         } else {
             while body.has_remaining() {
                 let mut chunk = body.chunk();
                 let count = chunk.len();
                 io::copy(&mut chunk, &mut stdin)?;
                 body.advance(count);
             }
         }
     }
     match child.wait_with_output() {
         Ok(output) if output.status.success() => {
             tracing::info!("git-http-backend: exited successfully for {}", id);
             let mut reader = std::io::Cursor::new(output.stdout);
             let mut headers = HashMap::new();
             // Parse headers returned by git so that we can use them in the client response.
             for line in io::Read::by_ref(&mut reader).lines() {
                 let line = line?;
                 if line.is_empty() || line == "\r" {
                     break;
                 }
                 let mut parts = line.splitn(2, ':');
                 let key = parts.next();
                 let value = parts.next();
                 if let (Some(key), Some(value)) = (key, value) {
                     let value = &value[1..];
                     headers
                         .entry(key.to_string())
                         .or_insert_with(Vec::new)
                         .push(value.to_string());
                 } else {
                     return Err(Error::Backend);
                 }
             }
             let status = {
                 tracing::debug!("git-http-backend: {:?}", &headers);
                 let line = headers.remove("Status").unwrap_or_default();
                 let line = line.into_iter().next().unwrap_or_default();
                 let mut parts = line.split(' ');
                 parts
                     .next()
                     .and_then(|p| p.parse().ok())
                     .unwrap_or(StatusCode::OK)
             };
             let position = reader.position() as usize;
             let body = reader.into_inner().split_off(position);
             Ok((status, headers, body))
         }
         Ok(output) => {
             tracing::error!("git-http-backend: exited with code {}", output.status);
             if let Ok(output) = std::str::from_utf8(&output.stderr) {
                 tracing::error!("git-http-backend: stderr: {}", output.trim_end());
             }
             Err(Error::Backend)
         }
         Err(err) => {
             panic!("failed to wait for git-http-backend: {}", err);
         }
     }
 }

added radicle-httpd/src/main.rs

@@ -0,0 +1,82 @@

 use std::{net, process};
 use tracing::dispatcher::Dispatch;
 use radicle_httpd as httpd;
 #[derive(Debug)]
 pub struct Options {
     pub listen: net::SocketAddr,
 }
 impl Options {
     fn from_env() -> Result<Self, lexopt::Error> {
         use lexopt::prelude::*;
         let mut parser = lexopt::Parser::from_env();
         let mut listen = None;
         while let Some(arg) = parser.next()? {
             match arg {
                 Long("listen") => {
                     let addr = parser.value()?.parse()?;
                     listen = Some(addr);
                 }
                 Long("help") => {
                     println!("usage: radicle-httpd [--listen <addr>]");
                     process::exit(0);
                 }
                 _ => return Err(arg.unexpected()),
             }
         }
         Ok(Self {
             listen: listen.unwrap_or_else(|| ([0, 0, 0, 0], 8080).into()),
         })
     }
 }
 impl From<Options> for httpd::Options {
     fn from(other: Options) -> Self {
         Self {
             listen: other.listen,
         }
     }
 }
 #[cfg(feature = "logfmt")]
 mod logger {
     use tracing_subscriber::layer::SubscriberExt as _;
     use tracing_subscriber::EnvFilter;
     pub fn subscriber() -> impl tracing::Subscriber {
         tracing_subscriber::Registry::default()
             .with(EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new("info")))
             .with(tracing_logfmt::layer())
     }
 }
 #[cfg(not(feature = "logfmt"))]
 mod logger {
     pub fn subscriber() -> impl tracing::Subscriber {
         tracing_subscriber::FmtSubscriber::new()
     }
 }
 #[tokio::main]
 async fn main() -> anyhow::Result<()> {
     let options = Options::from_env()?;
     tracing::dispatcher::set_global_default(Dispatch::new(logger::subscriber()))
         .expect("Global logger hasn't already been set");
     tracing::info!("version {}-{}", env!("CARGO_PKG_VERSION"), env!("GIT_HEAD"));
     match httpd::run(options.into()).await {
         Ok(()) => {}
         Err(err) => {
             tracing::error!("Fatal: {:#}", err);
             process::exit(1);
         }
     }
     Ok(())
 }