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|
use std::{
any::Any,
borrow::Cow,
io::{BufRead, Read},
path::PathBuf,
sync::{Arc, Mutex},
};
use base64::Engine;
use bstr::BStr;
use gix_packetline::PacketLineRef;
pub use traits::{Error, GetResponse, Http, PostBodyDataKind, PostResponse};
use crate::{
client::{
self,
blocking_io::bufread_ext::ReadlineBufRead,
capabilities,
http::options::{HttpVersion, SslVersionRangeInclusive},
Capabilities, ExtendedBufRead, HandleProgress, MessageKind, RequestWriter,
},
Protocol, Service,
};
#[cfg(all(feature = "http-client-reqwest", feature = "http-client-curl"))]
compile_error!("Cannot set both 'http-client-reqwest' and 'http-client-curl' features as they are mutually exclusive");
#[cfg(feature = "http-client-curl")]
///
pub mod curl;
/// The experimental `reqwest` backend.
///
/// It doesn't support any of the shared http options yet, but can be seen as example on how to integrate blocking `http` backends.
/// There is also nothing that would prevent it from becoming a fully-featured HTTP backend except for demand and time.
#[cfg(feature = "http-client-reqwest")]
pub mod reqwest;
mod traits;
///
pub mod options {
/// A function to authenticate a URL.
pub type AuthenticateFn =
dyn FnMut(gix_credentials::helper::Action) -> gix_credentials::protocol::Result + Send + Sync;
/// Possible settings for the `http.followRedirects` configuration option.
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub enum FollowRedirects {
/// Follow only the first redirect request, most suitable for typical git requests.
Initial,
/// Follow all redirect requests from the server unconditionally
All,
/// Follow no redirect request.
None,
}
impl Default for FollowRedirects {
fn default() -> Self {
FollowRedirects::Initial
}
}
/// The way to configure a proxy for authentication if a username is present in the configured proxy.
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub enum ProxyAuthMethod {
/// Automatically pick a suitable authentication method.
AnyAuth,
///HTTP basic authentication.
Basic,
/// Http digest authentication to prevent a password to be passed in clear text.
Digest,
/// GSS negotiate authentication.
Negotiate,
/// NTLM authentication
Ntlm,
}
impl Default for ProxyAuthMethod {
fn default() -> Self {
ProxyAuthMethod::AnyAuth
}
}
/// Available SSL version numbers.
#[derive(Debug, Copy, Clone, PartialEq, Eq, Ord, PartialOrd)]
#[allow(missing_docs)]
pub enum SslVersion {
/// The implementation default, which is unknown to this layer of abstraction.
Default,
TlsV1,
SslV2,
SslV3,
TlsV1_0,
TlsV1_1,
TlsV1_2,
TlsV1_3,
}
/// Available HTTP version numbers.
#[derive(Debug, Copy, Clone, PartialEq, Eq, Ord, PartialOrd)]
#[allow(missing_docs)]
pub enum HttpVersion {
/// Equivalent to HTTP/1.1
V1_1,
/// Equivalent to HTTP/2
V2,
}
/// The desired range of acceptable SSL versions, or the single version to allow if both are set to the same value.
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub struct SslVersionRangeInclusive {
/// The smallest allowed ssl version to use.
pub min: SslVersion,
/// The highest allowed ssl version to use.
pub max: SslVersion,
}
impl SslVersionRangeInclusive {
/// Return `min` and `max` fields in the right order so `min` is smaller or equal to `max`.
pub fn min_max(&self) -> (SslVersion, SslVersion) {
if self.min > self.max {
(self.max, self.min)
} else {
(self.min, self.max)
}
}
}
}
/// Options to configure http requests.
// TODO: testing most of these fields requires a lot of effort, unless special flags to introspect ongoing requests are added.
#[derive(Default, Clone)]
pub struct Options {
/// Headers to be added to every request.
/// They are applied unconditionally and are expected to be valid as they occour in an HTTP request, like `header: value`, without newlines.
///
/// Refers to `http.extraHeader` multi-var.
pub extra_headers: Vec<String>,
/// How to handle redirects.
///
/// Refers to `http.followRedirects`.
pub follow_redirects: options::FollowRedirects,
/// Used in conjunction with `low_speed_time_seconds`, any non-0 value signals the amount of bytes per second at least to avoid
/// aborting the connection.
///
/// Refers to `http.lowSpeedLimit`.
pub low_speed_limit_bytes_per_second: u32,
/// Used in conjunction with `low_speed_bytes_per_second`, any non-0 value signals the amount seconds the minimal amount
/// of bytes per second isn't reached.
///
/// Refers to `http.lowSpeedTime`.
pub low_speed_time_seconds: u64,
/// A curl-style proxy declaration of the form `[protocol://][user[:password]@]proxyhost[:port]`.
///
/// Note that an empty string means the proxy is disabled entirely.
/// Refers to `http.proxy`.
pub proxy: Option<String>,
/// The comma-separated list of hosts to not send through the `proxy`, or `*` to entirely disable all proxying.
pub no_proxy: Option<String>,
/// The way to authenticate against the proxy if the `proxy` field contains a username.
///
/// Refers to `http.proxyAuthMethod`.
pub proxy_auth_method: options::ProxyAuthMethod,
/// If authentication is needed for the proxy as its URL contains a username, this method must be set to provide a password
/// for it before making the request, and to store it if the connection succeeds.
pub proxy_authenticate: Option<(
gix_credentials::helper::Action,
Arc<std::sync::Mutex<options::AuthenticateFn>>,
)>,
/// The `HTTP` `USER_AGENT` string presented to an `HTTP` server, notably not the user agent present to the `git` server.
///
/// If not overridden, it defaults to the user agent provided by `curl`, which is a deviation from how `git` handles this.
/// Thus it's expected from the callers to set it to their application, or use higher-level crates which make it easy to do this
/// more correctly.
///
/// Using the correct user-agent might affect how the server treats the request.
///
/// Refers to `http.userAgent`.
pub user_agent: Option<String>,
/// The amount of time we wait until aborting a connection attempt.
///
/// If `None`, this typically defaults to 2 minutes to 5 minutes.
/// Refers to `gitoxide.http.connectTimeout`.
pub connect_timeout: Option<std::time::Duration>,
/// If enabled, emit additional information about connections and possibly the data received or written.
pub verbose: bool,
/// If set, use this path to point to a file with CA certificates to verify peers.
pub ssl_ca_info: Option<PathBuf>,
/// The SSL version or version range to use, or `None` to let the TLS backend determine which versions are acceptable.
pub ssl_version: Option<SslVersionRangeInclusive>,
/// The HTTP version to enforce. If unset, it is implementation defined.
pub http_version: Option<HttpVersion>,
/// Backend specific options, if available.
pub backend: Option<Arc<Mutex<dyn Any + Send + Sync + 'static>>>,
}
/// The actual http client implementation, using curl
#[cfg(feature = "http-client-curl")]
pub type Impl = curl::Curl;
/// The actual http client implementation, using reqwest
#[cfg(feature = "http-client-reqwest")]
pub type Impl = reqwest::Remote;
/// A transport for supporting arbitrary http clients by abstracting interactions with them into the [Http] trait.
pub struct Transport<H: Http> {
url: String,
user_agent_header: &'static str,
desired_version: Protocol,
actual_version: Protocol,
http: H,
service: Option<Service>,
line_provider: Option<gix_packetline::StreamingPeekableIter<H::ResponseBody>>,
identity: Option<gix_sec::identity::Account>,
}
impl<H: Http> Transport<H> {
/// Create a new instance with `http` as implementation to communicate to `url` using the given `desired_version`.
/// Note that we will always fallback to other versions as supported by the server.
pub fn new_http(http: H, url: &str, desired_version: Protocol) -> Self {
Transport {
url: url.to_owned(),
user_agent_header: concat!("User-Agent: git/oxide-", env!("CARGO_PKG_VERSION")),
desired_version,
actual_version: Default::default(),
service: None,
http,
line_provider: None,
identity: None,
}
}
}
#[cfg(any(feature = "http-client-curl", feature = "http-client-reqwest"))]
impl Transport<Impl> {
/// Create a new instance to communicate to `url` using the given `desired_version` of the `git` protocol.
///
/// Note that the actual implementation depends on feature toggles.
pub fn new(url: &str, desired_version: Protocol) -> Self {
Self::new_http(Impl::default(), url, desired_version)
}
}
impl<H: Http> Transport<H> {
fn check_content_type(service: Service, kind: &str, headers: <H as Http>::Headers) -> Result<(), client::Error> {
let wanted_content_type = format!("application/x-{}-{}", service.as_str(), kind);
if !headers.lines().collect::<Result<Vec<_>, _>>()?.iter().any(|l| {
let mut tokens = l.split(':');
tokens.next().zip(tokens.next()).map_or(false, |(name, value)| {
name.eq_ignore_ascii_case("content-type") && value.trim() == wanted_content_type
})
}) {
return Err(client::Error::Http(Error::Detail {
description: format!(
"Didn't find '{wanted_content_type}' header to indicate 'smart' protocol, and 'dumb' protocol is not supported."
),
}));
}
Ok(())
}
#[allow(clippy::unnecessary_wraps, unknown_lints)]
fn add_basic_auth_if_present(&self, headers: &mut Vec<Cow<'_, str>>) -> Result<(), client::Error> {
if let Some(gix_sec::identity::Account { username, password }) = &self.identity {
#[cfg(not(debug_assertions))]
if self.url.starts_with("http://") {
return Err(client::Error::AuthenticationRefused(
"Will not send credentials in clear text over http",
));
}
headers.push(Cow::Owned(format!(
"Authorization: Basic {}",
base64::engine::general_purpose::STANDARD.encode(format!("{username}:{password}"))
)))
}
Ok(())
}
}
fn append_url(base: &str, suffix: &str) -> String {
let mut buf = base.to_owned();
if base.as_bytes().last() != Some(&b'/') {
buf.push('/');
}
buf.push_str(suffix);
buf
}
impl<H: Http> client::TransportWithoutIO for Transport<H> {
fn set_identity(&mut self, identity: gix_sec::identity::Account) -> Result<(), client::Error> {
self.identity = Some(identity);
Ok(())
}
fn request(
&mut self,
write_mode: client::WriteMode,
on_into_read: MessageKind,
) -> Result<RequestWriter<'_>, client::Error> {
let service = self.service.expect("handshake() must have been called first");
let url = append_url(&self.url, service.as_str());
let static_headers = &[
Cow::Borrowed(self.user_agent_header),
Cow::Owned(format!("Content-Type: application/x-{}-request", service.as_str())),
format!("Accept: application/x-{}-result", service.as_str()).into(),
];
let mut dynamic_headers = Vec::new();
self.add_basic_auth_if_present(&mut dynamic_headers)?;
if self.actual_version != Protocol::V1 {
dynamic_headers.push(Cow::Owned(format!(
"Git-Protocol: version={}",
self.actual_version as usize
)));
}
let PostResponse {
headers,
body,
post_body,
} = self.http.post(
&url,
&self.url,
static_headers.iter().chain(&dynamic_headers),
write_mode.into(),
)?;
let line_provider = self
.line_provider
.as_mut()
.expect("handshake to have been called first");
line_provider.replace(body);
Ok(RequestWriter::new_from_bufread(
post_body,
Box::new(HeadersThenBody::<H, _> {
service,
headers: Some(headers),
body: line_provider.as_read_without_sidebands(),
}),
write_mode,
on_into_read,
))
}
fn to_url(&self) -> Cow<'_, BStr> {
Cow::Borrowed(self.url.as_str().into())
}
fn connection_persists_across_multiple_requests(&self) -> bool {
false
}
fn configure(&mut self, config: &dyn Any) -> Result<(), Box<dyn std::error::Error + Send + Sync + 'static>> {
self.http.configure(config)
}
}
impl<H: Http> client::Transport for Transport<H> {
fn handshake<'a>(
&mut self,
service: Service,
extra_parameters: &'a [(&'a str, Option<&'a str>)],
) -> Result<client::SetServiceResponse<'_>, client::Error> {
let url = append_url(self.url.as_ref(), &format!("info/refs?service={}", service.as_str()));
let static_headers = [Cow::Borrowed(self.user_agent_header)];
let mut dynamic_headers = Vec::<Cow<'_, str>>::new();
if self.desired_version != Protocol::V1 || !extra_parameters.is_empty() {
let mut parameters = if self.desired_version != Protocol::V1 {
let mut p = format!("version={}", self.desired_version as usize);
if !extra_parameters.is_empty() {
p.push(':');
}
p
} else {
String::new()
};
parameters.push_str(
&extra_parameters
.iter()
.map(|(key, value)| match value {
Some(value) => format!("{key}={value}"),
None => key.to_string(),
})
.collect::<Vec<_>>()
.join(":"),
);
dynamic_headers.push(format!("Git-Protocol: {parameters}").into());
}
self.add_basic_auth_if_present(&mut dynamic_headers)?;
let GetResponse { headers, body } =
self.http
.get(url.as_ref(), &self.url, static_headers.iter().chain(&dynamic_headers))?;
<Transport<H>>::check_content_type(service, "advertisement", headers)?;
let line_reader = self
.line_provider
.get_or_insert_with(|| gix_packetline::StreamingPeekableIter::new(body, &[PacketLineRef::Flush]));
// the service announcement is only sent sometimes depending on the exact server/protocol version/used protocol (http?)
// eat the announcement when its there to avoid errors later (and check that the correct service was announced).
// Ignore the announcement otherwise.
let line_ = line_reader
.peek_line()
.ok_or(client::Error::ExpectedLine("capabilities, version or service"))???;
let line = line_.as_text().ok_or(client::Error::ExpectedLine("text"))?;
if let Some(announced_service) = line.as_bstr().strip_prefix(b"# service=") {
if announced_service != service.as_str().as_bytes() {
return Err(client::Error::Http(Error::Detail {
description: format!(
"Expected to see service {:?}, but got {:?}",
service.as_str(),
announced_service
),
}));
}
line_reader.as_read().read_to_end(&mut Vec::new())?;
}
let capabilities::recv::Outcome {
capabilities,
refs,
protocol: actual_protocol,
} = Capabilities::from_lines_with_version_detection(line_reader)?;
self.actual_version = actual_protocol;
self.service = Some(service);
Ok(client::SetServiceResponse {
actual_protocol,
capabilities,
refs,
})
}
}
struct HeadersThenBody<H: Http, B: Unpin> {
service: Service,
headers: Option<H::Headers>,
body: B,
}
impl<H: Http, B: Unpin> HeadersThenBody<H, B> {
fn handle_headers(&mut self) -> std::io::Result<()> {
if let Some(headers) = self.headers.take() {
<Transport<H>>::check_content_type(self.service, "result", headers)
.map_err(|err| std::io::Error::new(std::io::ErrorKind::Other, err))?
}
Ok(())
}
}
impl<H: Http, B: Read + Unpin> Read for HeadersThenBody<H, B> {
fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
self.handle_headers()?;
self.body.read(buf)
}
}
impl<H: Http, B: BufRead + Unpin> BufRead for HeadersThenBody<H, B> {
fn fill_buf(&mut self) -> std::io::Result<&[u8]> {
self.handle_headers()?;
self.body.fill_buf()
}
fn consume(&mut self, amt: usize) {
self.body.consume(amt)
}
}
impl<H: Http, B: ReadlineBufRead + Unpin> ReadlineBufRead for HeadersThenBody<H, B> {
fn readline(&mut self) -> Option<std::io::Result<Result<PacketLineRef<'_>, gix_packetline::decode::Error>>> {
if let Err(err) = self.handle_headers() {
return Some(Err(err));
}
self.body.readline()
}
}
impl<H: Http, B: ExtendedBufRead + Unpin> ExtendedBufRead for HeadersThenBody<H, B> {
fn set_progress_handler(&mut self, handle_progress: Option<HandleProgress>) {
self.body.set_progress_handler(handle_progress)
}
fn peek_data_line(&mut self) -> Option<std::io::Result<Result<&[u8], client::Error>>> {
if let Err(err) = self.handle_headers() {
return Some(Err(err));
}
self.body.peek_data_line()
}
fn reset(&mut self, version: Protocol) {
self.body.reset(version)
}
fn stopped_at(&self) -> Option<MessageKind> {
self.body.stopped_at()
}
}
/// Connect to the given `url` via HTTP/S using the `desired_version` of the `git` protocol, with `http` as implementation.
#[cfg(all(feature = "http-client", not(feature = "http-client-curl")))]
pub fn connect_http<H: Http>(http: H, url: &str, desired_version: Protocol) -> Transport<H> {
Transport::new_http(http, url, desired_version)
}
/// Connect to the given `url` via HTTP/S using the `desired_version` of the `git` protocol.
#[cfg(any(feature = "http-client-curl", feature = "http-client-reqwest"))]
pub fn connect(url: &str, desired_version: Protocol) -> Transport<Impl> {
Transport::new(url, desired_version)
}
///
#[cfg(feature = "http-client-curl")]
pub mod redirect;
|