2021-03-18 11:30:33 +13:00
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use cached::proc_macro::cached;
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use futures_lite::{future::Boxed, FutureExt};
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use hyper::{body::Buf, client, Body, Request, Response, Uri};
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use serde_json::Value;
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use std::{result::Result, str::FromStr};
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use crate::server::RequestExt;
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pub async fn proxy(req: Request<Body>, format: &str) -> Result<Response<Body>, String> {
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let mut url = format.to_string();
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for (name, value) in req.params().iter() {
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url = url.replace(&format!("{{{}}}", name), value);
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}
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stream(&url).await
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}
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async fn stream(url: &str) -> Result<Response<Body>, String> {
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// First parameter is target URL (mandatory).
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2021-03-18 12:32:28 +13:00
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let url = Uri::from_str(url).map_err(|_| "Couldn't parse URL".to_string())?;
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2021-03-18 11:30:33 +13:00
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// Prepare the HTTPS connector.
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let https = hyper_rustls::HttpsConnector::with_native_roots();
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// Build the hyper client from the HTTPS connector.
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let client: client::Client<_, hyper::Body> = client::Client::builder().build(https);
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client
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.get(url)
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.await
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.map(|mut res| {
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let mut rm = |key: &str| res.headers_mut().remove(key);
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rm("access-control-expose-headers");
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rm("server");
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rm("vary");
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rm("etag");
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rm("x-cdn");
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rm("x-cdn-client-region");
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rm("x-cdn-name");
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rm("x-cdn-server-region");
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res
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})
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.map_err(|e| e.to_string())
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}
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fn request(url: String) -> Boxed<Result<Response<Body>, String>> {
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// Prepare the HTTPS connector.
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let https = hyper_rustls::HttpsConnector::with_native_roots();
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// Build the hyper client from the HTTPS connector.
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let client: client::Client<_, hyper::Body> = client::Client::builder().build(https);
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2021-03-18 17:26:06 +13:00
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let builder = Request::builder()
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2021-03-18 17:40:55 +13:00
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.method("GET")
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.uri(&url)
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.header("User-Agent", format!("web:libreddit:{}", env!("CARGO_PKG_VERSION")))
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.header("Host", "www.reddit.com")
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.header("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8")
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.header("Accept-Language", "en-US,en;q=0.5")
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.header("Connection", "keep-alive")
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.body(Body::empty());
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2021-03-18 11:30:33 +13:00
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async move {
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2021-03-18 17:26:06 +13:00
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match builder {
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Ok(req) => match client.request(req).await {
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Ok(response) => {
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if response.status().to_string().starts_with('3') {
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request(
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response
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.headers()
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.get("Location")
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.map(|val| val.to_str().unwrap_or_default())
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.unwrap_or_default()
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.to_string(),
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)
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.await
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} else {
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Ok(response)
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}
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2021-03-18 11:30:33 +13:00
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}
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2021-03-18 17:26:06 +13:00
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Err(e) => Err(e.to_string()),
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},
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2021-03-18 17:40:55 +13:00
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Err(_) => Err("Post url contains non-ASCII characters".to_string()),
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2021-03-18 11:30:33 +13:00
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}
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}
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.boxed()
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}
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// Make a request to a Reddit API and parse the JSON response
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#[cached(size = 100, time = 30, result = true)]
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pub async fn json(path: String) -> Result<Value, String> {
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// Build Reddit url from path
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let url = format!("https://www.reddit.com{}", path);
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// Closure to quickly build errors
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let err = |msg: &str, e: String| -> Result<Value, String> {
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2021-03-18 17:26:06 +13:00
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// eprintln!("{} - {}: {}", url, msg, e);
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Err(format!("{}: {}", msg, e))
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2021-03-18 11:30:33 +13:00
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};
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// Fetch the url...
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match request(url.clone()).await {
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Ok(response) => {
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// asynchronously aggregate the chunks of the body
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match hyper::body::aggregate(response).await {
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Ok(body) => {
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// Parse the response from Reddit as JSON
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match serde_json::from_reader(body.reader()) {
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Ok(value) => {
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let json: Value = value;
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// If Reddit returned an error
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if json["error"].is_i64() {
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Err(
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json["reason"]
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.as_str()
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.unwrap_or_else(|| {
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json["message"].as_str().unwrap_or_else(|| {
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eprintln!("{} - Error parsing reddit error", url);
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"Error parsing reddit error"
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})
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})
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.to_string(),
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)
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} else {
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Ok(json)
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}
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}
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Err(e) => err("Failed to parse page JSON data", e.to_string()),
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}
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}
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2021-03-18 17:26:06 +13:00
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Err(e) => err("Failed receiving body from Reddit", e.to_string()),
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2021-03-18 11:30:33 +13:00
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}
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}
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2021-03-27 16:00:47 +13:00
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Err(e) => err("Couldn't send request to Reddit", e),
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2021-03-18 11:30:33 +13:00
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}
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}
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