323 lines
12 KiB
Rust
323 lines
12 KiB
Rust
use crate::document::NATIVE_EVAL_JS;
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use crate::{assets::*, webview::WebviewEdits};
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use dioxus_interpreter_js::unified_bindings::SLEDGEHAMMER_JS;
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use dioxus_interpreter_js::NATIVE_JS;
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use std::path::{Path, PathBuf};
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use wry::{
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http::{status::StatusCode, Request, Response},
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RequestAsyncResponder, Result,
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};
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#[cfg(any(target_os = "android", target_os = "windows"))]
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const EDITS_PATH: &str = "http://dioxus.index.html/__edits";
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#[cfg(not(any(target_os = "android", target_os = "windows")))]
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const EDITS_PATH: &str = "dioxus://index.html/__edits";
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#[cfg(any(target_os = "android", target_os = "windows"))]
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const EVENTS_PATH: &str = "http://dioxus.index.html/__events";
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#[cfg(not(any(target_os = "android", target_os = "windows")))]
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const EVENTS_PATH: &str = "dioxus://index.html/__events";
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static DEFAULT_INDEX: &str = include_str!("./index.html");
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#[allow(clippy::too_many_arguments)] // just for now, should fix this eventually
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/// Handle a request from the webview
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///
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/// - Tries to stream edits if they're requested.
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/// - If that doesn't match, tries a user provided asset handler
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/// - If that doesn't match, tries to serve a file from the filesystem
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pub(super) fn desktop_handler(
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request: Request<Vec<u8>>,
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asset_handlers: AssetHandlerRegistry,
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responder: RequestAsyncResponder,
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edit_state: &WebviewEdits,
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custom_head: Option<String>,
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custom_index: Option<String>,
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root_name: &str,
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headless: bool,
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) {
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// Try to serve the index file first
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if let Some(index_bytes) =
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index_request(&request, custom_head, custom_index, root_name, headless)
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{
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return responder.respond(index_bytes);
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}
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// If the request is asking for edits (ie binary protocol streaming), do that
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let trimmed_uri = request.uri().path().trim_matches('/');
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if trimmed_uri == "__edits" {
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return edit_state.wry_queue.handle_request(responder);
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}
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// If the request is asking for an event response, do that
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if trimmed_uri == "__events" {
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return edit_state.handle_event(request, responder);
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}
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// todo: we want to move the custom assets onto a different protocol or something
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if let Some(name) = request.uri().path().split('/').next() {
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if asset_handlers.has_handler(name) {
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let _name = name.to_string();
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return asset_handlers.handle_request(&_name, request, responder);
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}
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}
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match serve_asset(request) {
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Ok(res) => responder.respond(res),
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Err(_e) => responder.respond(
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Response::builder()
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.status(StatusCode::INTERNAL_SERVER_ERROR)
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.body(String::from("Failed to serve asset").into_bytes())
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.unwrap(),
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),
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}
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}
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fn serve_asset(request: Request<Vec<u8>>) -> Result<Response<Vec<u8>>> {
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// If the user provided a custom asset handler, then call it and return the response if the request was handled.
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// The path is the first part of the URI, so we need to trim the leading slash.
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let mut uri_path = PathBuf::from(
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urlencoding::decode(request.uri().path())
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.expect("expected URL to be UTF-8 encoded")
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.as_ref(),
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);
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// Attempt to serve from the asset dir on android using its loader
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#[cfg(target_os = "android")]
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{
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if let Some(asset) = to_java_load_asset(request.uri().path()) {
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return Ok(Response::builder()
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.header("Content-Type", get_mime_by_ext(&uri_path))
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.header("Access-Control-Allow-Origin", "*")
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.body(asset)?);
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}
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}
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// If the asset doesn't exist, or starts with `/assets/`, then we'll try to serve out of the bundle
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// This lets us handle both absolute and relative paths without being too "special"
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// It just means that our macos bundle is a little "special" because we need to place an `assets`
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// dir in the `Resources` dir.
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//
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// If there's no asset root, we use the cargo manifest dir as the root, or the current dir
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if !uri_path.exists() || uri_path.starts_with("/assets/") {
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let bundle_root = get_asset_root();
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let relative_path = uri_path.strip_prefix("/").unwrap();
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uri_path = bundle_root.join(relative_path);
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}
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// If the asset exists, then we can serve it!
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if uri_path.exists() {
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let mime_type = get_mime_from_path(&uri_path);
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return Ok(Response::builder()
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.header("Content-Type", mime_type?)
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.header("Access-Control-Allow-Origin", "*")
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.body(std::fs::read(uri_path)?)?);
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}
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Ok(Response::builder()
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.status(StatusCode::NOT_FOUND)
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.body(String::from("Not Found").into_bytes())?)
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}
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/// Build the index.html file we use for bootstrapping a new app
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///
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/// We use wry/webview by building a special index.html that forms a bridge between the webview and your rust code
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///
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/// This is similar to tauri, except we give more power to your rust code and less power to your frontend code.
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/// This lets us skip a build/bundle step - your code just works - but limits how your Rust code can actually
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/// mess with UI elements. We make this decision since other renderers like LiveView are very separate and can
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/// never properly bridge the gap. Eventually of course, the idea is to build a custom CSS/HTML renderer where you
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/// *do* have native control over elements, but that still won't work with liveview.
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fn index_request(
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request: &Request<Vec<u8>>,
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custom_head: Option<String>,
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custom_index: Option<String>,
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root_name: &str,
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headless: bool,
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) -> Option<Response<Vec<u8>>> {
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// If the request is for the root, we'll serve the index.html file.
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if request.uri().path() != "/" {
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return None;
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}
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// Load a custom index file if provided
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let mut index = custom_index.unwrap_or_else(|| DEFAULT_INDEX.to_string());
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// Insert a custom head if provided
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// We look just for the closing head tag. If a user provided a custom index with weird syntax, this might fail
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if let Some(head) = custom_head {
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index.insert_str(index.find("</head>").expect("Head element to exist"), &head);
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}
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// Inject our module loader by looking for a body tag
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// A failure mode here, obviously, is if the user provided a custom index without a body tag
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// Might want to document this
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index.insert_str(
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index.find("</body>").expect("Body element to exist"),
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&module_loader(root_name, headless),
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);
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Response::builder()
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.header("Content-Type", "text/html")
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.header("Access-Control-Allow-Origin", "*")
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.body(index.into())
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.ok()
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}
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/// Construct the inline script that boots up the page and bridges the webview with rust code.
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///
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/// The arguments here:
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/// - root_name: the root element (by Id) that we stream edits into
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/// - headless: is this page being loaded but invisible? Important because not all windows are visible and the
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/// interpreter can't connect until the window is ready.
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fn module_loader(root_id: &str, headless: bool) -> String {
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format!(
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r#"
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<script type="module">
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// Bring the sledgehammer code
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{SLEDGEHAMMER_JS}
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// And then extend it with our native bindings
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{NATIVE_JS}
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// The native interpreter extends the sledgehammer interpreter with a few extra methods that we use for IPC
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window.interpreter = new NativeInterpreter("{EDITS_PATH}", "{EVENTS_PATH}");
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// Wait for the page to load before sending the initialize message
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window.onload = function() {{
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let root_element = window.document.getElementById("{root_id}");
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if (root_element != null) {{
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window.interpreter.initialize(root_element);
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window.ipc.postMessage(window.interpreter.serializeIpcMessage("initialize"));
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}}
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window.interpreter.waitForRequest({headless});
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}}
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</script>
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<script type="module">
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// Include the code for eval
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{NATIVE_EVAL_JS}
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</script>
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"#
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)
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}
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/// Get the asset directory, following tauri/cargo-bundles directory discovery approach
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///
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/// Currently supports:
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/// - [x] macOS
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/// - [x] iOS
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/// - [x] Windows
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/// - [x] Linux (appimage)
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/// - [ ] Linux (rpm)
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/// - [ ] Linux (deb)
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/// - [ ] Android
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#[allow(unreachable_code)]
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fn get_asset_root() -> PathBuf {
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let cur_exe = std::env::current_exe().unwrap();
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#[cfg(target_os = "macos")]
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{
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return cur_exe
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.parent()
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.unwrap()
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.parent()
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.unwrap()
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.join("Resources");
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}
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// For all others, the structure looks like this:
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// app.(exe/appimage)
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// main.exe
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// assets/
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cur_exe.parent().unwrap().to_path_buf()
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}
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/// Get the mime type from a path-like string
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fn get_mime_from_path(asset: &Path) -> Result<&'static str> {
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if asset.extension().is_some_and(|ext| ext == "svg") {
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return Ok("image/svg+xml");
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}
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match infer::get_from_path(asset)?.map(|f| f.mime_type()) {
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Some(f) if f != "text/plain" => Ok(f),
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_other => Ok(get_mime_by_ext(asset)),
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}
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}
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/// Get the mime type from a URI using its extension
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fn get_mime_by_ext(trimmed: &Path) -> &'static str {
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match trimmed.extension().and_then(|e| e.to_str()) {
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// The common assets are all utf-8 encoded
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Some("js") => "text/javascript; charset=utf-8",
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Some("css") => "text/css; charset=utf-8",
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Some("json") => "application/json; charset=utf-8",
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Some("svg") => "image/svg+xml; charset=utf-8",
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Some("html") => "text/html; charset=utf-8",
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// the rest... idk? probably not
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Some("mjs") => "text/javascript; charset=utf-8",
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Some("bin") => "application/octet-stream",
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Some("csv") => "text/csv",
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Some("ico") => "image/vnd.microsoft.icon",
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Some("jsonld") => "application/ld+json",
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Some("rtf") => "application/rtf",
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Some("mp4") => "video/mp4",
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// Assume HTML when a TLD is found for eg. `dioxus:://dioxuslabs.app` | `dioxus://hello.com`
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Some(_) => "text/html; charset=utf-8",
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// https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types
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// using octet stream according to this:
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None => "application/octet-stream",
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}
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}
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#[cfg(target_os = "android")]
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pub(crate) fn to_java_load_asset(filepath: &str) -> Option<Vec<u8>> {
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let normalized = filepath
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.trim_start_matches("/assets/")
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.trim_start_matches('/');
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// in debug mode, the asset might be under `/data/local/tmp/dx/` - attempt to read it from there if it exists
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#[cfg(debug_assertions)]
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{
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let path = std::path::PathBuf::from("/data/local/tmp/dx/").join(normalized);
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if path.exists() {
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return std::fs::read(path).ok();
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}
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}
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use std::{io::Read, ptr::NonNull};
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let ctx = ndk_context::android_context();
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let vm = unsafe { jni::JavaVM::from_raw(ctx.vm().cast()) }.unwrap();
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let mut env = vm.attach_current_thread().unwrap();
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// Query the Asset Manager
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let asset_manager_ptr = env
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.call_method(
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unsafe { jni::objects::JObject::from_raw(ctx.context().cast()) },
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"getAssets",
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"()Landroid/content/res/AssetManager;",
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&[],
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)
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.expect("Failed to get asset manager")
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.l()
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.expect("Failed to get asset manager as object");
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unsafe {
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let asset_manager =
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ndk_sys::AAssetManager_fromJava(env.get_native_interface(), *asset_manager_ptr);
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let asset_manager = ndk::asset::AssetManager::from_ptr(
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NonNull::new(asset_manager).expect("Invalid asset manager"),
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);
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let cstr = std::ffi::CString::new(normalized).unwrap();
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let mut asset = asset_manager.open(&cstr)?;
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Some(asset.buffer().unwrap().to_vec())
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}
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}
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