mirror of
https://github.com/denoland/deno.git
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208 lines
6.8 KiB
Rust
208 lines
6.8 KiB
Rust
// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
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use crate::deno_error;
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use crate::deno_error::DenoError;
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use crate::version;
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use deno::ErrBox;
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use futures::{future, Future};
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use reqwest;
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use reqwest::header::HeaderMap;
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use reqwest::header::CONTENT_TYPE;
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use reqwest::header::LOCATION;
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use reqwest::header::USER_AGENT;
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use reqwest::r#async::Client;
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use reqwest::RedirectPolicy;
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use url::Url;
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/// Create new instance of async reqwest::Client. This client supports
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/// proxies and doesn't follow redirects.
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pub fn get_client() -> Client {
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let mut headers = HeaderMap::new();
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headers.insert(
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USER_AGENT,
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format!("Deno/{}", version::DENO).parse().unwrap(),
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);
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Client::builder()
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.redirect(RedirectPolicy::none())
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.default_headers(headers)
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.use_sys_proxy()
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.build()
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.unwrap()
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}
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/// Construct the next uri based on base uri and location header fragment
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/// See <https://tools.ietf.org/html/rfc3986#section-4.2>
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fn resolve_url_from_location(base_url: &Url, location: &str) -> Url {
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if location.starts_with("http://") || location.starts_with("https://") {
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// absolute uri
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Url::parse(location).expect("provided redirect url should be a valid url")
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} else if location.starts_with("//") {
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// "//" authority path-abempty
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Url::parse(&format!("{}:{}", base_url.scheme(), location))
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.expect("provided redirect url should be a valid url")
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} else if location.starts_with('/') {
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// path-absolute
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base_url
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.join(location)
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.expect("provided redirect url should be a valid url")
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} else {
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// assuming path-noscheme | path-empty
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let base_url_path_str = base_url.path().to_owned();
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// Pop last part or url (after last slash)
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let segs: Vec<&str> = base_url_path_str.rsplitn(2, '/').collect();
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let new_path = format!("{}/{}", segs.last().unwrap_or(&""), location);
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base_url
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.join(&new_path)
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.expect("provided redirect url should be a valid url")
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}
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}
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#[derive(Debug, PartialEq)]
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pub enum FetchOnceResult {
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// (code, maybe_content_type)
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Code(String, Option<String>),
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Redirect(Url),
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}
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/// Asynchronously fetchs the given HTTP URL one pass only.
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/// If no redirect is present and no error occurs,
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/// yields Code(code, maybe_content_type).
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/// If redirect occurs, does not follow and
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/// yields Redirect(url).
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pub fn fetch_string_once(
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url: &Url,
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) -> impl Future<Item = FetchOnceResult, Error = ErrBox> {
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type FetchAttempt = (Option<String>, Option<String>, Option<FetchOnceResult>);
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let url = url.clone();
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let client = get_client();
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client
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.get(url.clone())
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.send()
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.map_err(ErrBox::from)
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.and_then(
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move |mut response| -> Box<
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dyn Future<Item = FetchAttempt, Error = ErrBox> + Send,
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> {
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if response.status().is_redirection() {
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let location_string = response.headers()
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.get(LOCATION)
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.expect("url redirection should provide 'location' header")
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.to_str()
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.unwrap();
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debug!("Redirecting to {:?}...", &location_string);
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let new_url = resolve_url_from_location(&url, location_string);
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// Boxed trait object turns out to be the savior for 2+ types yielding same results.
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return Box::new(future::ok(None).join3(
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future::ok(None),
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future::ok(Some(FetchOnceResult::Redirect(new_url))),
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));
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}
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if response.status().is_client_error() || response.status().is_server_error() {
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return Box::new(future::err(DenoError::new(
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deno_error::ErrorKind::Other,
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format!("Import '{}' failed: {}", &url, response.status()),
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).into()));
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}
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let content_type = response
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.headers()
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.get(CONTENT_TYPE)
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.map(|content_type| content_type.to_str().unwrap().to_owned());
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let body = response
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.text()
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.map_err(ErrBox::from);
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Box::new(
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Some(body).join3(future::ok(content_type), future::ok(None))
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)
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}
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)
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.and_then(move |(maybe_code, maybe_content_type, maybe_redirect)| {
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if let Some(redirect) = maybe_redirect {
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future::ok(redirect)
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} else {
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// maybe_code should always contain code here!
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future::ok(FetchOnceResult::Code(
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maybe_code.unwrap(),
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maybe_content_type,
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))
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}
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})
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::tokio_util;
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pub fn fetch_string_once_sync(url: &Url) -> Result<FetchOnceResult, ErrBox> {
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tokio_util::block_on(fetch_string_once(url))
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}
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#[test]
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fn test_fetch_sync_string() {
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// Relies on external http server. See tools/http_server.py
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let url = Url::parse("http://127.0.0.1:4545/package.json").unwrap();
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tokio_util::init(|| match fetch_string_once_sync(&url).unwrap() {
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FetchOnceResult::Code(code, maybe_content_type) => {
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assert!(!code.is_empty());
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assert_eq!(maybe_content_type, Some("application/json".to_string()));
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}
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_ => unreachable!(),
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});
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}
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#[test]
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fn test_fetch_string_once_with_redirect() {
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// Relies on external http server. See tools/http_server.py
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let url = Url::parse("http://127.0.0.1:4546/package.json").unwrap();
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// Dns resolver substitutes `127.0.0.1` with `localhost`
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let target_url = Url::parse("http://localhost:4545/package.json").unwrap();
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tokio_util::init(|| {
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let result = fetch_string_once_sync(&url).unwrap();
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assert_eq!(result, FetchOnceResult::Redirect(target_url));
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});
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}
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#[test]
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fn test_resolve_url_from_location_full_1() {
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let url = "http://deno.land".parse::<Url>().unwrap();
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let new_uri = resolve_url_from_location(&url, "http://golang.org");
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assert_eq!(new_uri.host_str().unwrap(), "golang.org");
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}
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#[test]
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fn test_resolve_url_from_location_full_2() {
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let url = "https://deno.land".parse::<Url>().unwrap();
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let new_uri = resolve_url_from_location(&url, "https://golang.org");
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assert_eq!(new_uri.host_str().unwrap(), "golang.org");
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}
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#[test]
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fn test_resolve_url_from_location_relative_1() {
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let url = "http://deno.land/x".parse::<Url>().unwrap();
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let new_uri = resolve_url_from_location(&url, "//rust-lang.org/en-US");
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assert_eq!(new_uri.host_str().unwrap(), "rust-lang.org");
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assert_eq!(new_uri.path(), "/en-US");
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}
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#[test]
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fn test_resolve_url_from_location_relative_2() {
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let url = "http://deno.land/x".parse::<Url>().unwrap();
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let new_uri = resolve_url_from_location(&url, "/y");
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assert_eq!(new_uri.host_str().unwrap(), "deno.land");
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assert_eq!(new_uri.path(), "/y");
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}
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#[test]
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fn test_resolve_url_from_location_relative_3() {
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let url = "http://deno.land/x".parse::<Url>().unwrap();
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let new_uri = resolve_url_from_location(&url, "z");
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assert_eq!(new_uri.host_str().unwrap(), "deno.land");
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assert_eq!(new_uri.path(), "/z");
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}
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}
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