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libreddit
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Custom HTTP client with Rustls

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spikecodes 2021-03-09 22:13:46 -08:00
parent 1c36549134
commit e59b2b1346
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GPG Key ID: 004CECFF9B463BCB
4 changed files with 141 additions and 45 deletions
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2
Cargo.toml
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@ -10,7 +10,7 @@ edition = "2018"
[dependencies]
tide = { version = "0.16.0", default-features = false, features = ["h1-server", "cookies"] }
async-std = { version = "1.9.0", features = ["attributes"] }
surf = { version = "2.2.0", default-features = false, features = ["curl-client", "encoding"] }
async-tls = { version = "0.11.0", default-features = false, features = ["client"] }
cached = "0.23.0"
askama = { version = "0.10.5", default-features = false }
serde = { version = "1.0.124", features = ["derive"] }

5
src/main.rs
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@ -2,10 +2,11 @@
#![forbid(unsafe_code)]
#![warn(clippy::pedantic, clippy::all)]
#![allow(
clippy::clippy::needless_pass_by_value,
clippy::needless_pass_by_value,
clippy::match_wildcard_for_single_variants,
clippy::cast_possible_truncation,
clippy::similar_names
clippy::similar_names,
clippy::cast_possible_wrap
)]
// Reference local files

68
src/proxy.rs
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@ -1,5 +1,6 @@
use surf::Body;
use tide::{Request, Response};
use async_std::{io, net::TcpStream, prelude::*};
use async_tls::TlsConnector;
use tide::{http::url::Url, Request, Response};
pub async fn handler(req: Request<()>, format: &str, params: Vec<&str>) -> tide::Result {
let mut url = format.to_string();
@ -13,20 +14,69 @@ pub async fn handler(req: Request<()>, format: &str, params: Vec<&str>) -> tide:
}
async fn request(url: String) -> tide::Result {
match surf::get(url).await {
Ok(res) => {
let content_length = res.header("Content-Length").map(std::string::ToString::to_string).unwrap_or_default();
let content_type = res.content_type().map(|m| m.to_string()).unwrap_or_default();
// Parse url into parts
let parts = Url::parse(&url).unwrap();
let host = parts.host().unwrap().to_string();
let domain = parts.domain().unwrap_or_default();
let path = format!("{}?{}", parts.path(), parts.query().unwrap_or_default());
// Build reddit-compliant user agent for Libreddit
let user_agent = format!("web:libreddit:{}", env!("CARGO_PKG_VERSION"));
// Construct a request body
let req = format!(
"GET {} HTTP/1.1\r\nHost: {}\r\nAccept: */*\r\nConnection: close\r\nUser-Agent: {}\r\n\r\n",
path, host, user_agent
);
// Initialize TLS connector for requests
let connector = TlsConnector::default();
// Open a TCP connection
let tcp_stream = TcpStream::connect(format!("{}:443", domain)).await.unwrap();
// Use the connector to start the handshake process
let mut tls_stream = connector.connect(domain, tcp_stream).await.unwrap();
// Write the aforementioned HTTP request to the stream
tls_stream.write_all(req.as_bytes()).await.unwrap();
// And read the response
let mut writer = Vec::new();
io::copy(&mut tls_stream, &mut writer).await.unwrap();
// Find the delimiter which separates the body and headers
match (0..writer.len()).find(|i| writer[i.to_owned()] == 10_u8 && writer[i - 2] == 10_u8) {
Some(delim) => {
// Split the response into the body and headers
let split = writer.split_at(delim);
let headers_str = String::from_utf8_lossy(split.0);
let headers = headers_str.split("\r\n").collect::<Vec<&str>>();
let body = split.1[1..split.1.len()].to_vec();
// Parse the status code from the first header line
let status: u16 = headers[0].split(' ').collect::<Vec<&str>>()[1].parse().unwrap_or_default();
// Define a closure for easier header fetching
let header = |name: &str| {
headers
.iter()
.find(|x| x.starts_with(name))
.map(|f| f.split(": ").collect::<Vec<&str>>()[1])
.unwrap_or_default()
};
let content_length = header("Content-Length");
let content_type = header("Content-Type");
Ok(
Response::builder(res.status())
.body(Body::from_reader(res, None))
Response::builder(status)
.body(tide::http::Body::from_bytes(body))
.header("Cache-Control", "public, max-age=1209600, s-maxage=86400")
.header("Content-Length", content_length)
.header("Content-Type", content_type)
.build(),
)
}
Err(e) => Ok(Response::builder(503).body(e.to_string()).build()),
None => Ok(Response::builder(503).body("Couldn't parse media".to_string()).build()),
}
}

111
src/utils.rs
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@ -2,6 +2,9 @@
// CRATES
//
use askama::Template;
use async_recursion::async_recursion;
use async_std::{io, net::TcpStream, prelude::*};
use async_tls::TlsConnector;
use cached::proc_macro::cached;
use regex::Regex;
use serde_json::{from_str, Error, Value};
@ -510,54 +513,96 @@ pub async fn error(req: Request<()>, msg: String) -> tide::Result {
Ok(Response::builder(404).content_type("text/html").body(body).build())
}
#[async_recursion]
async fn connect(path: String) -> io::Result<(i16, String)> {
// Build reddit-compliant user agent for Libreddit
let user_agent = format!("web:libreddit:{}", env!("CARGO_PKG_VERSION"));
// Construct an HTTP request body
let req = format!(
"GET {} HTTP/1.1\r\nHost: www.reddit.com\r\nAccept: */*\r\nConnection: close\r\nUser-Agent: {}\r\n\r\n",
path, user_agent
);
// Open a TCP connection
let tcp_stream = TcpStream::connect("www.reddit.com:443").await?;
// Initialize TLS connector for requests
let connector = TlsConnector::default();
// Use the connector to start the handshake process
let mut tls_stream = connector.connect("www.reddit.com", tcp_stream).await?;
// Write the crafted HTTP request to the stream
tls_stream.write_all(req.as_bytes()).await?;
// And read the response
let mut writer = Vec::new();
io::copy(&mut tls_stream, &mut writer).await?;
let response = String::from_utf8_lossy(&writer).to_string();
let split = response.split("\r\n\r\n").collect::<Vec<&str>>();
let headers = split[0].split("\r\n").collect::<Vec<&str>>();
let status: i16 = headers[0].split(' ').collect::<Vec<&str>>()[1].parse().unwrap_or(200);
let body = split[1].to_string();
if (300..400).contains(&status) {
let location = headers
.iter()
.find(|header| header.starts_with("location:"))
.map(|f| f.to_owned())
.unwrap_or_default()
.split(": ")
.collect::<Vec<&str>>()[1];
connect(location.replace("https://www.reddit.com", "")).await
} else {
Ok((status, body))
}
}
// Make a request to a Reddit API and parse the JSON response
#[cached(size = 100, time = 30, result = true)]
pub async fn request(path: String) -> Result<Value, String> {
let url = format!("https://www.reddit.com{}", path);
// Build reddit-compliant user agent for Libreddit
let user_agent = format!("web:libreddit:{}", env!("CARGO_PKG_VERSION"));
// Send request using surf
let req = surf::get(&url).header("User-Agent", user_agent.as_str());
let client = surf::client().with(surf::middleware::Redirect::new(5));
let res = client.send(req).await;
let err = |msg: &str, e: String| -> Result<Value, String> {
eprintln!("{} - {}: {}", url, msg, e);
Err(msg.to_string())
};
match res {
Ok(mut response) => match response.take_body().into_string().await {
// If response is success
Ok(body) => {
// Parse the response from Reddit as JSON
let parsed: Result<Value, Error> = from_str(&body);
match parsed {
Ok(json) => {
// If Reddit returned an error
if json["error"].is_i64() {
Err(
json["reason"]
.as_str()
.unwrap_or_else(|| {
json["message"].as_str().unwrap_or_else(|| {
eprintln!("{} - Error parsing reddit error", url);
"Error parsing reddit error"
match connect(path).await {
Ok((status, body)) => {
match status {
// If response is success
200 => {
// Parse the response from Reddit as JSON
let parsed: Result<Value, Error> = from_str(&body);
match parsed {
Ok(json) => {
// If Reddit returned an error
if json["error"].is_i64() {
Err(
json["reason"]
.as_str()
.unwrap_or_else(|| {
json["message"].as_str().unwrap_or_else(|| {
eprintln!("{} - Error parsing reddit error", url);
"Error parsing reddit error"
})
})
})
.to_string(),
)
} else {
Ok(json)
.to_string(),
)
} else {
Ok(json)
}
}
Err(e) => err("Failed to parse page JSON data", e.to_string()),
}
Err(e) => err("Failed to parse page JSON data", e.to_string()),
}
_ => err("Couldn't send request to Reddit", status.to_string()),
}
Err(e) => err("Couldn't parse request body", e.to_string()),
},
}
Err(e) => err("Couldn't send request to Reddit", e.to_string()),
}
}