File size: 5,500 Bytes
2d8be8f | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 | // Copyright 2019-2024 Tauri Programme within The Commons Conservancy
// SPDX-License-Identifier: Apache-2.0
// SPDX-License-Identifier: MIT
use axum::{
extract::{ws, State, WebSocketUpgrade},
http::{header, StatusCode, Uri},
response::{IntoResponse, Response},
};
use html5ever::{namespace_url, ns, LocalName, QualName};
use kuchiki::{traits::TendrilSink, NodeRef};
use std::{
net::{IpAddr, SocketAddr},
path::{Path, PathBuf},
thread,
time::Duration,
};
use tauri_utils::mime_type::MimeType;
use tokio::sync::broadcast::{channel, Sender};
use crate::error::ErrorExt;
const RELOAD_SCRIPT: &str = include_str!("./auto-reload.js");
#[derive(Clone)]
struct ServerState {
dir: PathBuf,
address: SocketAddr,
tx: Sender<()>,
}
pub fn start<P: AsRef<Path>>(dir: P, ip: IpAddr, port: Option<u16>) -> crate::Result<SocketAddr> {
let dir = dir.as_ref();
let dir =
dunce::canonicalize(dir).fs_context("failed to canonicalize path", dir.to_path_buf())?;
// bind port and tcp listener
let auto_port = port.is_none();
let mut port = port.unwrap_or(1430);
let (tcp_listener, address) = loop {
let address = SocketAddr::new(ip, port);
if let Ok(tcp) = std::net::TcpListener::bind(address) {
tcp.set_nonblocking(true).unwrap();
break (tcp, address);
}
if !auto_port {
crate::error::bail!("Couldn't bind to {port} on {ip}");
}
port += 1;
};
let (tx, _) = channel(1);
// watch dir for changes
let tx_c = tx.clone();
watch(dir.clone(), move || {
let _ = tx_c.send(());
});
let state = ServerState { dir, tx, address };
// start router thread
std::thread::spawn(move || {
tokio::runtime::Builder::new_current_thread()
.enable_io()
.build()
.expect("failed to start tokio runtime for builtin dev server")
.block_on(async move {
let router = axum::Router::new()
.fallback(handler)
.route("/__tauri_cli", axum::routing::get(ws_handler))
.with_state(state);
axum::serve(tokio::net::TcpListener::from_std(tcp_listener)?, router).await
})
.expect("builtin server errored");
});
Ok(address)
}
async fn handler(uri: Uri, state: State<ServerState>) -> impl IntoResponse {
// Frontend files should not contain query parameters. This seems to be how Vite handles it.
let uri = uri.path();
let uri = if uri == "/" {
uri
} else {
uri.strip_prefix('/').unwrap_or(uri)
};
let bytes = fs_read_scoped(state.dir.join(uri), &state.dir)
.or_else(|_| fs_read_scoped(state.dir.join(format!("{}.html", &uri)), &state.dir))
.or_else(|_| fs_read_scoped(state.dir.join(format!("{}/index.html", &uri)), &state.dir))
.or_else(|_| std::fs::read(state.dir.join("index.html")));
match bytes {
Ok(mut bytes) => {
let mime_type = MimeType::parse_with_fallback(&bytes, uri, MimeType::OctetStream);
if mime_type == MimeType::Html.to_string() {
bytes = inject_address(bytes, &state.address);
}
(StatusCode::OK, [(header::CONTENT_TYPE, mime_type)], bytes)
}
Err(_) => (
StatusCode::NOT_FOUND,
[(header::CONTENT_TYPE, "text/plain".into())],
vec![],
),
}
}
async fn ws_handler(ws: WebSocketUpgrade, state: State<ServerState>) -> Response {
ws.on_upgrade(move |mut ws| async move {
let mut rx = state.tx.subscribe();
while tokio::select! {
_ = ws.recv() => return,
fs_reload_event = rx.recv() => fs_reload_event.is_ok(),
} {
let msg = ws::Message::Text(r#"{"reload": true}"#.into());
if ws.send(msg).await.is_err() {
break;
}
}
})
}
fn inject_address(html_bytes: Vec<u8>, address: &SocketAddr) -> Vec<u8> {
fn with_html_head<F: FnOnce(&NodeRef)>(document: &mut NodeRef, f: F) {
if let Ok(ref node) = document.select_first("head") {
f(node.as_node())
} else {
let node = NodeRef::new_element(
QualName::new(None, ns!(html), LocalName::from("head")),
None,
);
f(&node);
document.prepend(node)
}
}
let mut document = kuchiki::parse_html()
.one(String::from_utf8_lossy(&html_bytes).into_owned())
.document_node;
with_html_head(&mut document, |head| {
let script = RELOAD_SCRIPT.replace("{{reload_url}}", &format!("ws://{address}/__tauri_cli"));
let script_el = NodeRef::new_element(QualName::new(None, ns!(html), "script".into()), None);
script_el.append(NodeRef::new_text(script));
head.prepend(script_el);
});
tauri_utils::html::serialize_node(&document)
}
fn fs_read_scoped(path: PathBuf, scope: &Path) -> crate::Result<Vec<u8>> {
let path = dunce::canonicalize(&path).fs_context("failed to canonicalize path", path)?;
if path.starts_with(scope) {
std::fs::read(&path).fs_context("failed to read file", &path)
} else {
crate::error::bail!("forbidden path")
}
}
fn watch<F: Fn() + Send + 'static>(dir: PathBuf, handler: F) {
thread::spawn(move || {
let (tx, rx) = std::sync::mpsc::channel();
let mut watcher = notify_debouncer_full::new_debouncer(Duration::from_secs(1), None, tx)
.expect("failed to start builtin server fs watcher");
watcher
.watch(&dir, notify::RecursiveMode::Recursive)
.expect("builtin server failed to watch dir");
loop {
if let Ok(Ok(event)) = rx.recv() {
if let Some(event) = event.first() {
if !event.kind.is_access() {
handler();
}
}
}
}
});
}
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