379 lines
18 KiB
Rust
379 lines
18 KiB
Rust
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// Firefox, driven through WebDriver BiDi: the W3C standard Firefox speaks (it dropped Chrome's
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// DevTools protocol). browser.rs keeps speaking DevTools; `cdp` turns each DevTools command it
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// uses into the BiDi one, so every browser tool works the same on Firefox: real mouse and keys,
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// the numbered elements, screenshots, PDF, page dialogs, uploads and downloads.
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//
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// Firefox allows one BiDi session per window (profile), so one connection per port is kept and
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// shared, one command at a time.
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use serde_json::{json, Value};
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use std::collections::HashMap;
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use std::io::ErrorKind;
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use std::net::{SocketAddr, TcpStream};
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use std::sync::{Arc, Mutex, OnceLock};
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use std::time::{Duration, Instant};
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const CALL_TIMEOUT_SECS: u64 = 30;
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/// A tab's title for the tab list: a page held up by a dialog mustn't hold the list up (estimated).
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const TITLE_TIMEOUT_SECS: u64 = 3;
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const SLOW: &str = "瀏覽器太久沒有回應（頁面可能跳出了對話框：可以用 browser_dialog 處理）";
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struct Conn {
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ws: tungstenite::WebSocket<TcpStream>,
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next: u64,
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}
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enum Fail {
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/// The connection is gone (Firefox closed): connect again.
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Link(String),
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/// No answer in time; a late answer is skipped later (by its id).
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Slow,
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/// Firefox answered with an error.
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Said(String),
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}
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impl Conn {
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fn open(port: u16) -> Result<Conn, String> {
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let addr: SocketAddr = format!("127.0.0.1:{port}").parse().map_err(|_| "Firefox 的連接埠不對".to_string())?;
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let stream = TcpStream::connect_timeout(&addr, Duration::from_secs(5)).map_err(|e| format!("連不上 Firefox：{e}"))?;
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let (ws, _) = tungstenite::client::client(format!("ws://127.0.0.1:{port}/session"), stream).map_err(|e| format!("連不上 Firefox：{e}"))?;
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let mut c = Conn { ws, next: 0 };
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// Page dialogs stay open until browser_dialog answers them (as in Chrome).
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let caps = json!({"capabilities": {"alwaysMatch": {"unhandledPromptBehavior": {"default": "ignore"}}}});
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if c.call("session.new", caps, CALL_TIMEOUT_SECS).is_err() {
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c.call("session.new", json!({"capabilities": {}}), CALL_TIMEOUT_SECS).map_err(|f| match f {
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Fail::Said(e) => format!("Firefox 不讓 AnyBot 控制（{e}）。可能有別的自動化工具正連著它。"),
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Fail::Slow => "Firefox 沒有回應".to_string(),
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Fail::Link(e) => format!("連不上 Firefox：{e}"),
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})?;
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}
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Ok(c)
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}
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fn call(&mut self, method: &str, params: Value, secs: u64) -> Result<Value, Fail> {
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self.next += 1;
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let id = self.next;
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let _ = self.ws.get_mut().set_read_timeout(Some(Duration::from_secs(secs)));
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self.ws.send(tungstenite::Message::Text(json!({"id": id, "method": method, "params": params}).to_string().into())).map_err(|e| Fail::Link(e.to_string()))?;
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let start = Instant::now();
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loop {
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if start.elapsed() > Duration::from_secs(secs) {
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return Err(Fail::Slow);
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}
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match self.ws.read() {
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Ok(tungstenite::Message::Text(t)) => {
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let v: Value = serde_json::from_str(t.as_str()).unwrap_or(Value::Null);
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if v["id"] != id {
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continue; // an event, or the late answer to an earlier command
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}
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if v["type"] == "error" {
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return Err(Fail::Said(format!("{}：{}", v["error"].as_str().unwrap_or("error"), v["message"].as_str().unwrap_or(""))));
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}
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return Ok(v["result"].clone());
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}
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Ok(tungstenite::Message::Close(_)) => return Err(Fail::Link("Firefox 關掉了連線".into())),
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Ok(_) => {}
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Err(tungstenite::Error::Io(e)) if matches!(e.kind(), ErrorKind::WouldBlock | ErrorKind::TimedOut) => return Err(Fail::Slow),
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Err(e) => return Err(Fail::Link(e.to_string())),
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}
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}
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}
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}
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fn conns() -> &'static Mutex<HashMap<u16, Arc<Mutex<Conn>>>> {
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static C: OnceLock<Mutex<HashMap<u16, Arc<Mutex<Conn>>>>> = OnceLock::new();
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C.get_or_init(Mutex::default)
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}
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/// One BiDi command to the Firefox on `port`.
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pub fn command(port: u16, method: &str, params: Value) -> Result<Value, String> {
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command_within(port, method, params, CALL_TIMEOUT_SECS)
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}
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fn command_within(port: u16, method: &str, params: Value, secs: u64) -> Result<Value, String> {
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// A connection left from a Firefox that has since closed fails once: connect again and retry.
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for attempt in 0..2 {
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let conn = {
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let mut m = conns().lock().unwrap_or_else(|e| e.into_inner());
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match m.get(&port) {
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Some(c) => c.clone(),
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None => {
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let c = Arc::new(Mutex::new(Conn::open(port)?));
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m.insert(port, c.clone());
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c
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}
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}
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};
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let r = conn.lock().unwrap_or_else(|e| e.into_inner()).call(method, params.clone(), secs);
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match r {
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Ok(v) => return Ok(v),
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Err(Fail::Said(e)) => return Err(e),
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Err(Fail::Slow) => return Err(SLOW.into()),
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Err(Fail::Link(e)) => {
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conns().lock().unwrap_or_else(|e| e.into_inner()).remove(&port);
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if attempt == 1 {
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return Err(format!("和 Firefox 的連線斷了：{e}"));
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}
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}
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}
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}
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Err("和 Firefox 的連線斷了".into())
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}
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/// A value Firefox sends back (a BiDi RemoteValue) as plain JSON, like DevTools' returnByValue.
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pub fn plain(v: &Value) -> Value {
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let list = |v: &Value| Value::Array(v["value"].as_array().map(|a| a.iter().map(plain).collect()).unwrap_or_default());
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match v["type"].as_str().unwrap_or("") {
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"string" | "boolean" | "date" => v["value"].clone(),
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"number" => match &v["value"] {
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Value::String(s) if s == "-0" => json!(0),
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Value::String(_) => Value::Null, // NaN, Infinity: what JSON.stringify gives
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n => n.clone(),
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},
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"bigint" => v["value"].as_str().and_then(|s| s.parse::<i64>().ok()).map(Value::from).unwrap_or(Value::Null),
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"array" | "set" | "nodelist" | "htmlcollection" => list(v),
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"object" | "map" => {
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let mut o = serde_json::Map::new();
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for pair in v["value"].as_array().cloned().unwrap_or_default() {
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let key = match &pair[0] {
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Value::String(s) => s.clone(),
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k => plain(k).as_str().map(String::from).unwrap_or_else(|| plain(k).to_string()),
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};
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o.insert(key, plain(&pair[1]));
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}
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Value::Object(o)
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}
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"regexp" => v["value"]["pattern"].clone(),
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"null" | "undefined" => Value::Null,
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// A page element, a window…: DevTools gives an empty object for those too.
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_ => json!({}),
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}
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}
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// ---------- tabs ----------
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/// The tabs AnyBot used last on each Firefox, latest first.
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fn recent() -> &'static Mutex<HashMap<u16, Vec<String>>> {
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static R: OnceLock<Mutex<HashMap<u16, Vec<String>>>> = OnceLock::new();
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R.get_or_init(Mutex::default)
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}
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/// This tab is the one in use now.
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pub fn touch(port: u16, id: &str) {
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let mut r = recent().lock().unwrap_or_else(|e| e.into_inner());
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let l = r.entry(port).or_default();
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l.retain(|t| t != id);
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l.insert(0, id.to_string());
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l.truncate(50);
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}
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/// The open tabs as DevTools lists them ({id, type: "page", url, title}), in the order DevTools
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/// gives too: the one in use first (the tab showing in the window, then the ones AnyBot used
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/// last, then the newest).
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pub fn pages(port: u16) -> Result<Vec<Value>, String> {
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let tree = command(port, "browsingContext.getTree", json!({"maxDepth": 0}))?;
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let used = recent().lock().unwrap_or_else(|e| e.into_inner()).get(&port).cloned().unwrap_or_default();
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let mut tabs = vec![];
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for (i, c) in tree["contexts"].as_array().cloned().unwrap_or_default().iter().enumerate() {
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let id = c["context"].as_str().unwrap_or("").to_string();
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let info = command_within(port, "script.evaluate", json!({"expression": "JSON.stringify([document.title, document.visibilityState])", "target": {"context": id}, "awaitPromise": false, "resultOwnership": "none"}), TITLE_TIMEOUT_SECS)
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.ok()
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.and_then(|r| plain(&r["result"]).as_str().and_then(|s| serde_json::from_str::<Value>(s).ok()))
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.unwrap_or(Value::Null);
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let showing = info[1] == "visible";
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let rank = used.iter().position(|u| *u == id).unwrap_or(usize::MAX);
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tabs.push(((!showing, rank, std::cmp::Reverse(i)), json!({"id": id, "type": "page", "url": c["url"], "title": info[0].as_str().unwrap_or("")})));
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}
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tabs.sort_by_key(|t| t.0);
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Ok(tabs.into_iter().map(|(_, t)| t).collect())
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}
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/// Open a new tab at `url` (in front). Returns its id.
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pub fn new_tab(port: u16, url: &str) -> Result<String, String> {
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let r = command(port, "browsingContext.create", json!({"type": "tab"}))?;
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let id = r["context"].as_str().ok_or("Firefox 沒有開新分頁")?.to_string();
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if url != "about:blank" {
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command(port, "browsingContext.navigate", json!({"context": id, "url": url, "wait": "none"}))?;
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}
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touch(port, &id);
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Ok(id)
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}
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pub fn activate(port: u16, id: &str) -> Result<(), String> {
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command(port, "browsingContext.activate", json!({"context": id}))?;
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touch(port, id);
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Ok(())
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}
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pub fn close(port: u16, id: &str) -> Result<(), String> {
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command(port, "browsingContext.close", json!({"context": id})).map(|_| ())
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}
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// ---------- DevTools commands, done the BiDi way ----------
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/// WebDriver's code for a key DevTools names (Enter, ArrowDown…); a letter is itself.
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fn key_value(key: &str) -> String {
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match key {
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"Enter" => "\u{E007}",
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"Tab" => "\u{E004}",
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"Escape" => "\u{E00C}",
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"Backspace" => "\u{E003}",
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"Delete" => "\u{E017}",
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"ArrowDown" => "\u{E015}",
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"ArrowUp" => "\u{E013}",
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"ArrowLeft" => "\u{E012}",
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"ArrowRight" => "\u{E014}",
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"PageDown" => "\u{E00F}",
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"PageUp" => "\u{E00E}",
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"Home" => "\u{E011}",
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"End" => "\u{E010}",
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other => return other.to_string(),
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}
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.to_string()
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}
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/// DevTools' modifier bits (alt 1, ctrl 2, meta 4, shift 8) as WebDriver keys.
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fn modifier_keys(bits: i64) -> Vec<&'static str> {
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[(1, "\u{E00A}"), (2, "\u{E009}"), (4, "\u{E03D}"), (8, "\u{E008}")].iter().filter(|(b, _)| bits & b != 0).map(|(_, k)| *k).collect()
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}
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fn keys(port: u16, ctx: &str, actions: Vec<Value>) -> Result<Value, String> {
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command(port, "input.performActions", json!({"context": ctx, "actions": [{"type": "key", "id": "keyboard", "actions": actions}]}))?;
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Ok(json!({}))
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}
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/// Typing text: each character a real key press (Firefox puts in any character, 中文 too, the way
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/// a keyboard would, so editors that only listen to typing get it). A line break is Enter.
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fn type_actions(text: &str) -> Vec<Value> {
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text.chars()
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.filter(|c| *c != '\r')
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.flat_map(|c| {
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let k = if c == '\n' { "\u{E007}".to_string() } else { c.to_string() };
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[json!({"type": "keyDown", "value": k}), json!({"type": "keyUp", "value": k})]
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})
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.collect()
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}
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/// Run one DevTools command (the ones browser.rs uses) on tab `ctx` of the Firefox on `port`;
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/// the answer is shaped like DevTools' own.
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pub fn cdp(port: u16, ctx: &str, method: &str, p: &Value) -> Result<Value, String> {
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match method {
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"Runtime.evaluate" => {
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let by_value = p["returnByValue"].as_bool().unwrap_or(false);
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let r = command(port, "script.evaluate", json!({
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"expression": p["expression"], "target": {"context": ctx},
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"awaitPromise": p["awaitPromise"].as_bool().unwrap_or(false),
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"resultOwnership": if by_value { "none" } else { "root" },
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"userActivation": p["userGesture"].as_bool().unwrap_or(false),
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}))?;
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if r["type"] == "exception" {
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let d = &r["exceptionDetails"];
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let text = d["text"].as_str().unwrap_or("").to_string();
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return Ok(json!({"exceptionDetails": {"text": text, "exception": {"description": text}}}));
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}
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let v = &r["result"];
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Ok(if by_value {
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json!({"result": {"value": plain(v)}})
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} else {
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// A page element stays reachable by its shared id (for DOM.setFileInputFiles).
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json!({"result": {"objectId": v["sharedId"].as_str().or(v["handle"].as_str())}})
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})
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}
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"Input.dispatchMouseEvent" => {
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// Firefox refuses a pointer outside the page; DevTools let it pass.
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let at = |k: &str| p[k].as_f64().unwrap_or(0.0).max(0.0).round() as i64;
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let mv = json!({"type": "pointerMove", "x": at("x"), "y": at("y"), "duration": 0});
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let button = match p["button"].as_str() {
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Some("right") => 2,
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Some("middle") => 1,
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|
|
_ => 0,
|
|||
|
|
};
|
|||
|
|
let actions = match p["type"].as_str() {
|
|||
|
|
Some("mousePressed") => vec![mv, json!({"type": "pointerDown", "button": button})],
|
|||
|
|
Some("mouseReleased") => vec![mv, json!({"type": "pointerUp", "button": button})],
|
|||
|
|
_ => vec![mv],
|
|||
|
|
};
|
|||
|
|
command(port, "input.performActions", json!({"context": ctx, "actions": [{"type": "pointer", "id": "mouse", "parameters": {"pointerType": "mouse"}, "actions": actions}]}))?;
|
|||
|
|
Ok(json!({}))
|
|||
|
|
}
|
|||
|
|
"Input.dispatchKeyEvent" => {
|
|||
|
|
let key = key_value(p["key"].as_str().unwrap_or(""));
|
|||
|
|
let mods = modifier_keys(p["modifiers"].as_i64().unwrap_or(0));
|
|||
|
|
let mut actions = vec![];
|
|||
|
|
if p["type"] == "keyUp" {
|
|||
|
|
actions.push(json!({"type": "keyUp", "value": key}));
|
|||
|
|
actions.extend(mods.iter().rev().map(|m| json!({"type": "keyUp", "value": m})));
|
|||
|
|
} else {
|
|||
|
|
actions.extend(mods.iter().map(|m| json!({"type": "keyDown", "value": m})));
|
|||
|
|
actions.push(json!({"type": "keyDown", "value": key}));
|
|||
|
|
}
|
|||
|
|
keys(port, ctx, actions)
|
|||
|
|
}
|
|||
|
|
"Input.insertText" => keys(port, ctx, type_actions(p["text"].as_str().unwrap_or(""))),
|
|||
|
|
"Page.captureScreenshot" => {
|
|||
|
|
let mut q = json!({"context": ctx, "origin": if p["captureBeyondViewport"] == true { "document" } else { "viewport" }});
|
|||
|
|
if p["format"] == "jpeg" {
|
|||
|
|
q["format"] = json!({"type": "image/jpeg", "quality": p["quality"].as_f64().unwrap_or(75.0) / 100.0});
|
|||
|
|
}
|
|||
|
|
if let Some(c) = p.get("clip") {
|
|||
|
|
q["clip"] = json!({"type": "box", "x": c["x"], "y": c["y"], "width": c["width"], "height": c["height"]});
|
|||
|
|
}
|
|||
|
|
let r = command(port, "browsingContext.captureScreenshot", q)?;
|
|||
|
|
Ok(json!({"data": r["data"]}))
|
|||
|
|
}
|
|||
|
|
"Page.getLayoutMetrics" => {
|
|||
|
|
let r = command(port, "script.evaluate", json!({"expression": "JSON.stringify([document.documentElement.scrollWidth, document.documentElement.scrollHeight])", "target": {"context": ctx}, "awaitPromise": false, "resultOwnership": "none"}))?;
|
|||
|
|
let wh: Vec<f64> = plain(&r["result"]).as_str().and_then(|s| serde_json::from_str(s).ok()).unwrap_or_default();
|
|||
|
|
Ok(json!({"cssContentSize": {"width": wh.first().copied().unwrap_or(1280.0), "height": wh.get(1).copied().unwrap_or(2000.0)}}))
|
|||
|
|
}
|
|||
|
|
"Page.reload" => command(port, "browsingContext.reload", json!({"context": ctx, "wait": "none"})).map(|_| json!({})),
|
|||
|
|
"Page.printToPDF" => {
|
|||
|
|
let r = command(port, "browsingContext.print", json!({"context": ctx, "background": p["printBackground"].as_bool().unwrap_or(true)}))?;
|
|||
|
|
Ok(json!({"data": r["data"]}))
|
|||
|
|
}
|
|||
|
|
"Page.handleJavaScriptDialog" => {
|
|||
|
|
let mut q = json!({"context": ctx, "accept": p["accept"].as_bool().unwrap_or(true)});
|
|||
|
|
if let Some(t) = p["promptText"].as_str() {
|
|||
|
|
q["userText"] = json!(t);
|
|||
|
|
}
|
|||
|
|
command(port, "browsingContext.handleUserPrompt", q).map(|_| json!({}))
|
|||
|
|
}
|
|||
|
|
"DOM.setFileInputFiles" => {
|
|||
|
|
let el = p["objectId"].as_str().ok_or("找不到上傳檔案的欄位")?;
|
|||
|
|
command(port, "input.setFiles", json!({"context": ctx, "element": {"sharedId": el}, "files": p["files"]})).map(|_| json!({}))
|
|||
|
|
}
|
|||
|
|
"Browser.setDownloadBehavior" | "Page.setDownloadBehavior" => {
|
|||
|
|
command(port, "browser.setDownloadBehavior", json!({"downloadBehavior": {"type": "allowed", "destinationFolder": p["downloadPath"]}})).map(|_| json!({}))
|
|||
|
|
}
|
|||
|
|
other => Err(format!("Firefox 不支援 {other}")),
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
#[cfg(test)]
|
|||
|
|
mod tests {
|
|||
|
|
use super::*;
|
|||
|
|
|
|||
|
|
#[test]
|
|||
|
|
fn values_come_back_as_plain_json() {
|
|||
|
|
assert_eq!(plain(&json!({"type": "string", "value": "hi"})), json!("hi"));
|
|||
|
|
assert_eq!(plain(&json!({"type": "number", "value": 3})), json!(3));
|
|||
|
|
assert_eq!(plain(&json!({"type": "number", "value": "NaN"})), Value::Null);
|
|||
|
|
assert_eq!(plain(&json!({"type": "undefined"})), Value::Null);
|
|||
|
|
assert_eq!(plain(&json!({"type": "array", "value": [{"type": "boolean", "value": true}, {"type": "null"}]})), json!([true, null]));
|
|||
|
|
let obj = json!({"type": "object", "value": [["a", {"type": "number", "value": 1}], ["b", {"type": "array", "value": [{"type": "string", "value": "x"}]}]]});
|
|||
|
|
assert_eq!(plain(&obj), json!({"a": 1, "b": ["x"]}));
|
|||
|
|
assert_eq!(plain(&json!({"type": "node", "sharedId": "abc"})), json!({}));
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
#[test]
|
|||
|
|
fn keys_and_text_become_webdriver_actions() {
|
|||
|
|
assert_eq!(key_value("Enter"), "\u{E007}");
|
|||
|
|
assert_eq!(key_value("a"), "a");
|
|||
|
|
assert_eq!(modifier_keys(2 | 8), vec!["\u{E009}", "\u{E008}"]);
|
|||
|
|
let t = type_actions("中a\n");
|
|||
|
|
assert_eq!(t.len(), 6);
|
|||
|
|
assert_eq!(t[0], json!({"type": "keyDown", "value": "中"}));
|
|||
|
|
assert_eq!(t[4], json!({"type": "keyDown", "value": "\u{E007}"}));
|
|||
|
|
}
|
|||
|
|
}
|