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HTTP compression (Reddit -> Libreddit -> client) (#612) 

Implements HTTP compression, between both Reddit and Libreddit and Libreddit
and a web browser. Compression between Reddit and Libreddit is mandatory,
whereas compression between Libreddit and a client is opt-in (client must
specify a compressor in the Accept-Encoding header).

Supported compressors are gzip and brotli. gzip support is ubiquitous,
whereas brotli is supported by almost all modern browsers except Safari
(iOS, iPhone, macOS), although Safari may support brotli in the future.

Co-authored-by: Matthew E <matt@matthew.science>
This commit is contained in:
Daniel Valentine 2022-11-03 22:04:34 -06:00 committed by GitHub
parent 8435b8eab9
commit ae3ea2da7c
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 762 additions and 26 deletions
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137
Cargo.lock generated
View File

@ -2,6 +2,12 @@
# It is not intended for manual editing.
version = 3
[[package]]
name = "adler32"
version = "1.2.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "aae1277d39aeec15cb388266ecc24b11c80469deae6067e17a1a7aa9e5c1f234"
[[package]]
name = "aho-corasick"
version = "0.7.19"
@ -11,6 +17,21 @@ dependencies = [
"memchr",
]
[[package]]
name = "alloc-no-stdlib"
version = "2.0.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "cc7bb162ec39d46ab1ca8c77bf72e890535becd1751bb45f64c597edb4c8c6b3"
[[package]]
name = "alloc-stdlib"
version = "0.2.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "94fb8275041c72129eb51b7d0322c29b8387a0386127718b096429201a5d6ece"
dependencies = [
"alloc-no-stdlib",
]
[[package]]
name = "askama"
version = "0.11.1"
@ -109,6 +130,27 @@ dependencies = [
"generic-array",
]
[[package]]
name = "brotli"
version = "3.3.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a1a0b1dbcc8ae29329621f8d4f0d835787c1c38bb1401979b49d13b0b305ff68"
dependencies = [
"alloc-no-stdlib",
"alloc-stdlib",
"brotli-decompressor",
]
[[package]]
name = "brotli-decompressor"
version = "2.3.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "59ad2d4653bf5ca36ae797b1f4bb4dbddb60ce49ca4aed8a2ce4829f60425b80"
dependencies = [
"alloc-no-stdlib",
"alloc-stdlib",
]
[[package]]
name = "bstr"
version = "0.2.17"
@ -233,6 +275,15 @@ dependencies = [
"libc",
]
[[package]]
name = "crc32fast"
version = "1.3.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b540bd8bc810d3885c6ea91e2018302f68baba2129ab3e88f32389ee9370880d"
dependencies = [
"cfg-if",
]
[[package]]
name = "crypto-common"
version = "0.1.6"
@ -398,6 +449,17 @@ dependencies = [
"version_check",
]
[[package]]
name = "getrandom"
version = "0.2.8"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "c05aeb6a22b8f62540c194aac980f2115af067bfe15a0734d7277a768d396b31"
dependencies = [
"cfg-if",
"libc",
"wasi",
]
[[package]]
name = "globset"
version = "0.4.9"
@ -580,18 +642,41 @@ version = "0.2.137"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "fc7fcc620a3bff7cdd7a365be3376c97191aeaccc2a603e600951e452615bf89"
[[package]]
name = "libflate"
version = "1.2.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "05605ab2bce11bcfc0e9c635ff29ef8b2ea83f29be257ee7d730cac3ee373093"
dependencies = [
"adler32",
"crc32fast",
"libflate_lz77",
]
[[package]]
name = "libflate_lz77"
version = "1.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "39a734c0493409afcd49deee13c006a04e3586b9761a03543c6272c9c51f2f5a"
dependencies = [
"rle-decode-fast",
]
[[package]]
name = "libreddit"
version = "0.23.1"
dependencies = [
"askama",
"async-recursion",
"brotli",
"cached",
"clap",
"cookie",
"futures-lite",
"hyper",
"hyper-rustls",
"libflate",
"lipsum",
"percent-encoding",
"regex",
"route-recognizer",
@ -603,6 +688,16 @@ dependencies = [
"url",
]
[[package]]
name = "lipsum"
version = "0.8.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a8451846f1f337e44486666989fbce40be804da139d5a4477d6b88ece5dc69f4"
dependencies = [
"rand",
"rand_chacha",
]
[[package]]
name = "lock_api"
version = "0.4.9"
@ -756,6 +851,12 @@ version = "0.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
[[package]]
name = "ppv-lite86"
version = "0.2.16"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "eb9f9e6e233e5c4a35559a617bf40a4ec447db2e84c20b55a6f83167b7e57872"
[[package]]
name = "proc-macro2"
version = "1.0.47"
@ -774,6 +875,36 @@ dependencies = [
"proc-macro2",
]
[[package]]
name = "rand"
version = "0.8.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
dependencies = [
"libc",
"rand_chacha",
"rand_core",
]
[[package]]
name = "rand_chacha"
version = "0.3.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
dependencies = [
"ppv-lite86",
"rand_core",
]
[[package]]
name = "rand_core"
version = "0.6.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
dependencies = [
"getrandom",
]
[[package]]
name = "redox_syscall"
version = "0.2.16"
@ -815,6 +946,12 @@ dependencies = [
"winapi",
]
[[package]]
name = "rle-decode-fast"
version = "1.0.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3582f63211428f83597b51b2ddb88e2a91a9d52d12831f9d08f5e624e8977422"
[[package]]
name = "route-recognizer"
version = "0.3.1"

5
Cargo.toml
View File

@ -25,3 +25,8 @@ tokio = { version = "1.21.2", features = ["full"] }
time = "0.3.16"
url = "2.3.1"
rust-embed = { version = "6.4.2", features = ["include-exclude"] }
libflate = "1.2.0"
brotli = { version = "3.3.4", features = ["std"] }
[dev-dependencies]
lipsum = "0.8.2"

52
src/client.rs
View File

@ -1,9 +1,10 @@
use cached::proc_macro::cached;
use futures_lite::{future::Boxed, FutureExt};
use hyper::{body::Buf, client, Body, Request, Response, Uri};
use hyper::{body, body::Buf, client, header, Body, Request, Response, Uri};
use libflate::gzip;
use percent_encoding::{percent_encode, CONTROLS};
use serde_json::Value;
use std::result::Result;
use std::{io, result::Result};
use crate::server::RequestExt;
@ -76,6 +77,7 @@ fn request(url: String, quarantine: bool) -> Boxed<Result<Response<Body>, String
.header("User-Agent", format!("web:libreddit:{}", env!("CARGO_PKG_VERSION")))
.header("Host", "www.reddit.com")
.header("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8")
.header("Accept-Encoding", "gzip") // Reddit doesn't do brotli yet.
.header("Accept-Language", "en-US,en;q=0.5")
.header("Connection", "keep-alive")
.header("Cookie", if quarantine { "_options=%7B%22pref_quarantine_optin%22%3A%20true%7D" } else { "" })
@ -84,7 +86,7 @@ fn request(url: String, quarantine: bool) -> Boxed<Result<Response<Body>, String
async move {
match builder {
Ok(req) => match client.request(req).await {
Ok(response) => {
Ok(mut response) => {
if response.status().to_string().starts_with('3') {
request(
response
@ -100,7 +102,49 @@ fn request(url: String, quarantine: bool) -> Boxed<Result<Response<Body>, String
)
.await
} else {
Ok(response)
match response.headers().get(header::CONTENT_ENCODING) {
// Content not compressed.
None => Ok(response),
// Content gzipped.
Some(hdr) => {
// Since we requested gzipped content, we expect
// to get back gzipped content. If we get
// back anything else, that's a problem.
if hdr.ne("gzip") {
return Err("Reddit response was encoded with an unsupported compressor".to_string());
}
// The body must be something that implements
// std::io::Read, hence the conversion to
// bytes::buf::Buf and then transformation into a
// Reader.
let mut decompressed: Vec<u8>;
{
let mut aggregated_body = match body::aggregate(response.body_mut()).await {
Ok(b) => b.reader(),
Err(e) => return Err(e.to_string()),
};
let mut decoder = match gzip::Decoder::new(&mut aggregated_body) {
Ok(decoder) => decoder,
Err(e) => return Err(e.to_string()),
};
decompressed = Vec::<u8>::new();
match io::copy(&mut decoder, &mut decompressed) {
Ok(_) => {}
Err(e) => return Err(e.to_string()),
};
}
response.headers_mut().remove(header::CONTENT_ENCODING);
response.headers_mut().insert(header::CONTENT_LENGTH, decompressed.len().into());
*(response.body_mut()) = Body::from(decompressed);
Ok(response)
}
}
}
}
Err(e) => Err(e.to_string()),

579
src/server.rs
View File

@ -1,17 +1,80 @@
use brotli::enc::{BrotliCompress, BrotliEncoderParams};
use cached::proc_macro::cached;
use cookie::Cookie;
use core::f64;
use futures_lite::{future::Boxed, Future, FutureExt};
use hyper::{
header::HeaderValue,
body,
body::HttpBody,
header,
service::{make_service_fn, service_fn},
HeaderMap,
};
use hyper::{Body, Method, Request, Response, Server as HyperServer};
use libflate::gzip;
use route_recognizer::{Params, Router};
use std::{pin::Pin, result::Result};
use std::{
cmp::Ordering,
io,
pin::Pin,
result::Result,
str::{from_utf8, Split},
string::ToString,
};
use time::Duration;
use crate::dbg_msg;
type BoxResponse = Pin<Box<dyn Future<Output = Result<Response<Body>, String>> + Send>>;
/// Compressors for the response Body, in ascending order of preference.
#[derive(Copy, Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
enum CompressionType {
Passthrough,
Gzip,
Brotli,
}
/// All browsers support gzip, so if we are given `Accept-Encoding: *`, deliver
/// gzipped-content.
///
/// Brotli would be nice universally, but Safari (iOS, iPhone, macOS) reportedly
/// doesn't support it yet.
const DEFAULT_COMPRESSOR: CompressionType = CompressionType::Gzip;
impl CompressionType {
/// Returns a `CompressionType` given a content coding
/// in [RFC 7231](https://datatracker.ietf.org/doc/html/rfc7231#section-5.3.4)
/// format.
fn parse(s: &str) -> Option<CompressionType> {
let c = match s {
// Compressors we support.
"gzip" => CompressionType::Gzip,
"br" => CompressionType::Brotli,
// The wildcard means that we can choose whatever
// compression we prefer. In this case, use the
// default.
"*" => DEFAULT_COMPRESSOR,
// Compressor not supported.
_ => return None,
};
Some(c)
}
}
impl ToString for CompressionType {
fn to_string(&self) -> String {
match self {
CompressionType::Gzip => "gzip".to_string(),
CompressionType::Brotli => "br".to_string(),
_ => String::new(),
}
}
}
pub struct Route<'a> {
router: &'a mut Router<fn(Request<Body>) -> BoxResponse>,
path: String,
@ -97,7 +160,7 @@ impl ResponseExt for Response<Body> {
}
fn insert_cookie(&mut self, cookie: Cookie) {
if let Ok(val) = HeaderValue::from_str(&cookie.to_string()) {
if let Ok(val) = header::HeaderValue::from_str(&cookie.to_string()) {
self.headers_mut().append("Set-Cookie", val);
}
}
@ -106,7 +169,7 @@ impl ResponseExt for Response<Body> {
let mut cookie = Cookie::named(name);
cookie.set_path("/");
cookie.set_max_age(Duration::seconds(1));
if let Ok(val) = HeaderValue::from_str(&cookie.to_string()) {
if let Ok(val) = header::HeaderValue::from_str(&cookie.to_string()) {
self.headers_mut().append("Set-Cookie", val);
}
}
@ -156,10 +219,11 @@ impl Server {
// let shared_router = router.clone();
async move {
Ok::<_, String>(service_fn(move |req: Request<Body>| {
let headers = default_headers.clone();
let req_headers = req.headers().clone();
let def_headers = default_headers.clone();
// Remove double slashes and decode encoded slashes
let mut path = req.uri().path().replace("//", "/").replace("%2F","/");
let mut path = req.uri().path().replace("//", "/").replace("%2F", "/");
// Remove trailing slashes
if path != "/" && path.ends_with('/') {
@ -176,26 +240,20 @@ impl Server {
// Run the route's function
let func = (found.handler().to_owned().to_owned())(parammed);
async move {
let res: Result<Response<Body>, String> = func.await;
// Add default headers to response
res.map(|mut response| {
response.headers_mut().extend(headers);
response
})
match func.await {
Ok(mut res) => {
res.headers_mut().extend(def_headers);
let _ = compress_response(req_headers, &mut res).await;
Ok(res)
}
Err(msg) => new_boilerplate(def_headers, req_headers, 500, Body::from(msg)).await,
}
}
.boxed()
}
// If there was a routing error
Err(e) => async move {
// Return a 404 error
let res: Result<Response<Body>, String> = Ok(Response::builder().status(404).body(e.into()).unwrap_or_default());
// Add default headers to response
res.map(|mut response| {
response.headers_mut().extend(headers);
response
})
}
.boxed(),
Err(e) => async move { new_boilerplate(def_headers, req_headers, 404, e.into()).await }.boxed(),
}
}))
}
@ -213,3 +271,480 @@ impl Server {
server.boxed()
}
}
/// Create a boilerplate Response for error conditions. This response will be
/// compressed if requested by client.
async fn new_boilerplate(
default_headers: HeaderMap<header::HeaderValue>,
req_headers: HeaderMap<header::HeaderValue>,
status: u16,
body: Body,
) -> Result<Response<Body>, String> {
match Response::builder().status(status).body(body) {
Ok(mut res) => {
let _ = compress_response(req_headers, &mut res).await;
res.headers_mut().extend(default_headers.clone());
Ok(res)
}
Err(msg) => Err(msg.to_string()),
}
}
/// Determines the desired compressor based on the Accept-Encoding header.
///
/// This function will honor the [q-value](https://developer.mozilla.org/en-US/docs/Glossary/Quality_values)
/// for each compressor. The q-value is an optional parameter, a decimal value
/// on \[0..1\], to order the compressors by preference. An Accept-Encoding value
/// with no q-values is also accepted.
///
/// Here are [examples](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Encoding#examples)
/// of valid Accept-Encoding headers.
///
/// ```http
/// Accept-Encoding: gzip
/// Accept-Encoding: gzip, compress, br
/// Accept-Encoding: br;q=1.0, gzip;q=0.8, *;q=0.1
/// ```
fn determine_compressor(accept_encoding: &str) -> Option<CompressionType> {
if accept_encoding.is_empty() {
return None;
};
// Keep track of the compressor candidate based on both the client's
// preference and our own. Concrete examples:
//
// 1. "Accept-Encoding: gzip, br" => assuming we like brotli more than
// gzip, and the browser supports brotli, we choose brotli
//
// 2. "Accept-Encoding: gzip;q=0.8, br;q=0.3" => the client has stated a
// preference for gzip over brotli, so we choose gzip
//
// To do this, we need to define a struct which contains the requested
// requested compressor (abstracted as a CompressionType enum) and the
// q-value. If no q-value is defined for the compressor, we assume one of
// 1.0. We first compare compressor candidates by comparing q-values, and
// then CompressionTypes. We keep track of whatever is the greatest per our
// ordering.
struct CompressorCandidate {
alg: CompressionType,
q: f64,
}
impl Ord for CompressorCandidate {
fn cmp(&self, other: &Self) -> Ordering {
// Compare q-values. Break ties with the
// CompressionType values.
match self.q.total_cmp(&other.q) {
Ordering::Equal => self.alg.cmp(&other.alg),
ord => ord,
}
}
}
impl PartialOrd for CompressorCandidate {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
// Guard against NAN, both on our end and on the other.
if self.q.is_nan() || other.q.is_nan() {
return None;
};
// f64 and CompressionType are ordered, except in the case
// where the f64 is NAN (which we checked against), so we
// can safely return a Some here.
Some(self.cmp(other))
}
}
impl PartialEq for CompressorCandidate {
fn eq(&self, other: &Self) -> bool {
(self.q == other.q) && (self.alg == other.alg)
}
}
impl Eq for CompressorCandidate {}
// This is the current candidate.
//
// Assmume no candidate so far. We do this by assigning the sentinel value
// of negative infinity to the q-value. If this value is negative infinity,
// that means there was no viable compressor candidate.
let mut cur_candidate = CompressorCandidate {
alg: CompressionType::Passthrough,
q: f64::NEG_INFINITY,
};
// This loop reads the requested compressors and keeps track of whichever
// one has the highest priority per our heuristic.
for val in accept_encoding.to_string().split(',') {
let mut q: f64 = 1.0;
// The compressor and q-value (if the latter is defined)
// will be delimited by semicolons.
let mut spl: Split<char> = val.split(';');
// Get the compressor. For example, in
// gzip;q=0.8
// this grabs "gzip" in the string. It
// will further validate the compressor against the
// list of those we support. If it is not supported,
// we move onto the next one.
let compressor: CompressionType = match spl.next() {
// CompressionType::parse will return the appropriate enum given
// a string. For example, it will return CompressionType::Gzip
// when given "gzip".
Some(s) => match CompressionType::parse(s.trim()) {
Some(candidate) => candidate,
// We don't support the requested compression algorithm.
None => continue,
},
// We should never get here, but I'm paranoid.
None => continue,
};
// Get the q-value. This might not be defined, in which case assume
// 1.0.
if let Some(s) = spl.next() {
if !(s.len() > 2 && s.starts_with("q=")) {
// If the q-value is malformed, the header is malformed, so
// abort.
return None;
}
match s[2..].parse::<f64>() {
Ok(val) => {
if (0.0..=1.0).contains(&val) {
q = val;
} else {
// If the value is outside [0..1], header is malformed.
// Abort.
return None;
};
}
Err(_) => {
// If this isn't a f64, then assume a malformed header
// value and abort.
return None;
}
}
};
// If new_candidate > cur_candidate, make new_candidate the new
// cur_candidate. But do this safely! It is very possible that
// someone gave us the string "NAN", which (&str).parse::<f64>
// will happily translate to f64::NAN.
let new_candidate = CompressorCandidate { alg: compressor, q };
if let Some(ord) = new_candidate.partial_cmp(&cur_candidate) {
if ord == Ordering::Greater {
cur_candidate = new_candidate;
}
};
}
if cur_candidate.q != f64::NEG_INFINITY {
Some(cur_candidate.alg)
} else {
None
}
}
/// Compress the response body, if possible or desirable. The Body will be
/// compressed in place, and a new header Content-Encoding will be set
/// indicating the compression algorithm.
///
/// This function deems Body eligible compression if and only if the following
/// conditions are met:
///
/// 1. the HTTP client requests a compression encoding in the Content-Encoding
/// header (hence the need for the req_headers);
///
/// 2. the content encoding corresponds to a compression algorithm we support;
///
/// 3. the Media type in the Content-Type response header is text with any
/// subtype (e.g. text/plain) or application/json.
///
/// compress_response returns Ok on successful compression, or if not all three
/// conditions above are met. It returns Err if there was a problem decoding
/// any header in either req_headers or res, but res will remain intact.
///
/// This function logs errors to stderr, but only in debug mode. No information
/// is logged in release builds.
async fn compress_response(req_headers: HeaderMap<header::HeaderValue>, res: &mut Response<Body>) -> Result<(), String> {
// Check if the data is eligible for compression.
if let Some(hdr) = res.headers().get(header::CONTENT_TYPE) {
match from_utf8(hdr.as_bytes()) {
Ok(val) => {
let s = val.to_string();
// TODO: better determination of what is eligible for compression
if !(s.starts_with("text/") || s.starts_with("application/json")) {
return Ok(());
};
}
Err(e) => {
dbg_msg!(e);
return Err(e.to_string());
}
};
} else {
// Response declares no Content-Type. Assume for simplicity that it
// cannot be compressed.
return Ok(());
};
// Don't bother if the size of the size of the response body will fit
// within an IP frame (less the bytes that make up the TCP/IP and HTTP
// headers).
if res.body().size_hint().lower() < 1452 {
return Ok(());
};
// Quick and dirty closure for extracting a header from the request and
// returning it as a &str.
let get_req_header = |k: header::HeaderName| -> Option<&str> {
match req_headers.get(k) {
Some(hdr) => match from_utf8(hdr.as_bytes()) {
Ok(val) => Some(val),
#[cfg(debug_assertions)]
Err(e) => {
dbg_msg!(e);
None
}
#[cfg(not(debug_assertions))]
Err(_) => None,
},
None => None,
}
};
// Check to see which compressor is requested, and if we can use it.
let accept_encoding: &str = match get_req_header(header::ACCEPT_ENCODING) {
Some(val) => val,
None => return Ok(()), // Client requested no compression.
};
let compressor: CompressionType = match determine_compressor(accept_encoding) {
Some(c) => c,
None => return Ok(()),
};
// Get the body from the response.
let body_bytes: Vec<u8> = match body::to_bytes(res.body_mut()).await {
Ok(b) => b.to_vec(),
Err(e) => {
dbg_msg!(e);
return Err(e.to_string());
}
};
// Compress!
match compress_body(compressor, body_bytes) {
Ok(compressed) => {
// We get here iff the compression was successful. Replace the body
// with the compressed payload, and add the appropriate
// Content-Encoding header in the response.
res.headers_mut().insert(header::CONTENT_ENCODING, compressor.to_string().parse().unwrap());
*(res.body_mut()) = Body::from(compressed);
}
Err(e) => return Err(e),
}
Ok(())
}
/// Compresses a `Vec<u8>` given a [`CompressionType`].
///
/// This is a helper function for [`compress_response`] and should not be
/// called directly.
// I've chosen a TTL of 600 (== 10 minutes) since compression is
// computationally expensive and we don't want to be doing it often. This is
// larger than client::json's TTL, but that's okay, because if client::json
// returns a new serde_json::Value, body_bytes changes, so this function will
// execute again.
#[cached(size = 100, time = 600, result = true)]
fn compress_body(compressor: CompressionType, body_bytes: Vec<u8>) -> Result<Vec<u8>, String> {
// io::Cursor implements io::Read, required for our encoders.
let mut reader = io::Cursor::new(body_bytes);
let compressed: Vec<u8> = match compressor {
CompressionType::Gzip => {
let mut gz: gzip::Encoder<Vec<u8>> = match gzip::Encoder::new(Vec::new()) {
Ok(gz) => gz,
Err(e) => {
dbg_msg!(e);
return Err(e.to_string());
}
};
match io::copy(&mut reader, &mut gz) {
Ok(_) => match gz.finish().into_result() {
Ok(compressed) => compressed,
Err(e) => {
dbg_msg!(e);
return Err(e.to_string());
}
},
Err(e) => {
dbg_msg!(e);
return Err(e.to_string());
}
}
}
CompressionType::Brotli => {
// We may want to make the compression parameters configurable
// in the future. For now, the defaults are sufficient.
let brotli_params = BrotliEncoderParams::default();
let mut compressed = Vec::<u8>::new();
match BrotliCompress(&mut reader, &mut compressed, &brotli_params) {
Ok(_) => compressed,
Err(e) => {
dbg_msg!(e);
return Err(e.to_string());
}
}
}
// This arm is for any requested compressor for which we don't yet
// have an implementation.
_ => {
let msg = "unsupported compressor".to_string();
return Err(msg);
}
};
Ok(compressed)
}
#[cfg(test)]
mod tests {
use super::*;
use brotli::Decompressor as BrotliDecompressor;
use futures_lite::future::block_on;
use lipsum::lipsum;
use std::{boxed::Box, io};
#[test]
fn test_determine_compressor() {
// Single compressor given.
assert_eq!(determine_compressor("unsupported"), None);
assert_eq!(determine_compressor("gzip"), Some(CompressionType::Gzip));
assert_eq!(determine_compressor("*"), Some(DEFAULT_COMPRESSOR));
// Multiple compressors.
assert_eq!(determine_compressor("gzip, br"), Some(CompressionType::Brotli));
assert_eq!(determine_compressor("gzip;q=0.8, br;q=0.3"), Some(CompressionType::Gzip));
assert_eq!(determine_compressor("br, gzip"), Some(CompressionType::Brotli));
assert_eq!(determine_compressor("br;q=0.3, gzip;q=0.4"), Some(CompressionType::Gzip));
// Invalid q-values.
assert_eq!(determine_compressor("gzip;q=NAN"), None);
}
#[test]
fn test_compress_response() {
// This macro generates an Accept-Encoding header value given any number of
// compressors.
macro_rules! ae_gen {
($x:expr) => {
$x.to_string().as_str()
};
($x:expr, $($y:expr),+) => {
format!("{}, {}", $x.to_string(), ae_gen!($($y),+)).as_str()
};
}
for accept_encoding in [
"*",
ae_gen!(CompressionType::Gzip),
ae_gen!(CompressionType::Brotli, CompressionType::Gzip),
ae_gen!(CompressionType::Brotli),
] {
// Determine what the expected encoding should be based on both the
// specific encodings we accept.
let expected_encoding: CompressionType = match determine_compressor(accept_encoding) {
Some(s) => s,
None => panic!("determine_compressor(accept_encoding) => None"),
};
// Build headers with our Accept-Encoding.
let mut req_headers = HeaderMap::new();
req_headers.insert(header::ACCEPT_ENCODING, header::HeaderValue::from_str(accept_encoding).unwrap());
// Build test response.
let lorem_ipsum: String = lipsum(10000);
let expected_lorem_ipsum = Vec::<u8>::from(lorem_ipsum.as_str());
let mut res = Response::builder()
.status(200)
.header(header::CONTENT_TYPE, "text/plain")
.body(Body::from(lorem_ipsum))
.unwrap();
// Perform the compression.
if let Err(e) = block_on(compress_response(req_headers, &mut res)) {
panic!("compress_response(req_headers, &mut res) => Err(\"{}\")", e);
};
// If the content was compressed, we expect the Content-Encoding
// header to be modified.
assert_eq!(
res
.headers()
.get(header::CONTENT_ENCODING)
.unwrap_or_else(|| panic!("missing content-encoding header"))
.to_str()
.unwrap_or_else(|_| panic!("failed to convert Content-Encoding header::HeaderValue to String")),
expected_encoding.to_string()
);
// Decompress body and make sure it's equal to what we started
// with.
//
// In the case of no compression, just make sure the "new" body in
// the Response is the same as what with which we start.
let body_vec = match block_on(body::to_bytes(res.body_mut())) {
Ok(b) => b.to_vec(),
Err(e) => panic!("{}", e),
};
if expected_encoding == CompressionType::Passthrough {
assert!(body_vec.eq(&expected_lorem_ipsum));
continue;
}
// This provides an io::Read for the underlying body.
let mut body_cursor: io::Cursor<Vec<u8>> = io::Cursor::new(body_vec);
// Match the appropriate decompresor for the given
// expected_encoding.
let mut decoder: Box<dyn io::Read> = match expected_encoding {
CompressionType::Gzip => match gzip::Decoder::new(&mut body_cursor) {
Ok(dgz) => Box::new(dgz),
Err(e) => panic!("{}", e),
},
CompressionType::Brotli => Box::new(BrotliDecompressor::new(body_cursor, expected_lorem_ipsum.len())),
_ => panic!("no decompressor for {}", expected_encoding.to_string()),
};
let mut decompressed = Vec::<u8>::new();
match io::copy(&mut decoder, &mut decompressed) {
Ok(_) => {}
Err(e) => panic!("{}", e),
};
assert!(decompressed.eq(&expected_lorem_ipsum));
}
}
}

15
src/utils.rs
View File

@ -13,6 +13,21 @@ use std::str::FromStr;
use time::{macros::format_description, Duration, OffsetDateTime};
use url::Url;
/// Write a message to stderr on debug mode. This function is a no-op on
/// release code.
#[macro_export]
macro_rules! dbg_msg {
($x:expr) => {
#[cfg(debug_assertions)]
eprintln!("{}:{}: {}", file!(), line!(), $x.to_string())
};
($($x:expr),+) => {
#[cfg(debug_assertions)]
dbg_msg!(format!($($x),+))
};
}
// Post flair with content, background color and foreground color
pub struct Flair {
pub flair_parts: Vec<FlairPart>,