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