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278// Copyright 2020-2023 Tauri Programme within The Commons Conservancy
// SPDX-License-Identifier: Apache-2.0
// SPDX-License-Identifier: MIT
fn main() -> wry::Result<()> {
imp::main()
}
#[cfg(not(feature = "protocol"))]
mod imp {
pub fn main() -> wry::Result<()> {
unimplemented!()
}
}
#[cfg(feature = "protocol")]
mod imp {
use std::{
io::{Read, Seek, SeekFrom, Write},
path::PathBuf,
};
use http::{header, StatusCode};
use http_range::HttpRange;
use tao::{
event::{Event, WindowEvent},
event_loop::{ControlFlow, EventLoop},
window::WindowBuilder,
};
use wry::{
http::{header::*, Request, Response},
WebViewBuilder,
};
pub fn main() -> wry::Result<()> {
let event_loop = EventLoop::new();
let window = WindowBuilder::new().build(&event_loop).unwrap();
let builder = WebViewBuilder::new()
.with_custom_protocol(
"wry".into(),
move |_webview_id, request| match wry_protocol(request) {
Ok(r) => r.map(Into::into),
Err(e) => http::Response::builder()
.header(CONTENT_TYPE, "text/plain")
.status(500)
.body(e.to_string().as_bytes().to_vec())
.unwrap()
.map(Into::into),
},
)
.with_custom_protocol(
"stream".into(),
move |_webview_id, request| match stream_protocol(request) {
Ok(r) => r.map(Into::into),
Err(e) => http::Response::builder()
.header(CONTENT_TYPE, "text/plain")
.status(500)
.body(e.to_string().as_bytes().to_vec())
.unwrap()
.map(Into::into),
},
)
// tell the webview to load the custom protocol
.with_url("wry://localhost");
#[cfg(any(
target_os = "windows",
target_os = "macos",
target_os = "ios",
target_os = "android"
))]
let _webview = builder.build(&window)?;
#[cfg(not(any(
target_os = "windows",
target_os = "macos",
target_os = "ios",
target_os = "android"
)))]
let _webview = {
use tao::platform::unix::WindowExtUnix;
use wry::WebViewBuilderExtUnix;
let vbox = window.default_vbox().unwrap();
builder.build_gtk(vbox)?
};
event_loop.run(move |event, _, control_flow| {
*control_flow = ControlFlow::Wait;
if let Event::WindowEvent {
event: WindowEvent::CloseRequested,
..
} = event
{
*control_flow = ControlFlow::Exit
}
});
}
fn wry_protocol(
request: Request<Vec<u8>>,
) -> Result<http::Response<Vec<u8>>, Box<dyn std::error::Error>> {
let path = request.uri().path();
// Read the file content from file path
let root = PathBuf::from("examples/streaming");
let path = if path == "/" {
"index.html"
} else {
// removing leading slash
&path[1..]
};
let content = std::fs::read(std::fs::canonicalize(root.join(path))?)?;
// Return asset contents and mime types based on file extentions
// If you don't want to do this manually, there are some crates for you.
// Such as `infer` and `mime_guess`.
let mimetype = if path.ends_with(".html") || path == "/" {
"text/html"
} else if path.ends_with(".js") {
"text/javascript"
} else {
unimplemented!();
};
Response::builder()
.header(CONTENT_TYPE, mimetype)
.body(content)
.map_err(Into::into)
}
fn stream_protocol(
request: http::Request<Vec<u8>>,
) -> Result<http::Response<Vec<u8>>, Box<dyn std::error::Error>> {
// skip leading `/`
let path = percent_encoding::percent_decode(&request.uri().path().as_bytes()[1..])
.decode_utf8_lossy()
.to_string();
let mut file = std::fs::File::open(path)?;
// get file length
let len = {
let old_pos = file.stream_position()?;
let len = file.seek(SeekFrom::End(0))?;
file.seek(SeekFrom::Start(old_pos))?;
len
};
let mut resp = Response::builder().header(CONTENT_TYPE, "video/mp4");
// if the webview sent a range header, we need to send a 206 in return
// Actually only macOS and Windows are supported. Linux will ALWAYS return empty headers.
let http_response = if let Some(range_header) = request.headers().get("range") {
let not_satisfiable = || {
Response::builder()
.status(StatusCode::RANGE_NOT_SATISFIABLE)
.header(header::CONTENT_RANGE, format!("bytes */{len}"))
.body(vec![])
};
// parse range header
let ranges = if let Ok(ranges) = HttpRange::parse(range_header.to_str()?, len) {
ranges
.iter()
// map the output back to spec range <start-end>, example: 0-499
.map(|r| (r.start, r.start + r.length - 1))
.collect::<Vec<_>>()
} else {
return Ok(not_satisfiable()?);
};
/// The Maximum bytes we send in one range
const MAX_LEN: u64 = 1000 * 1024;
if ranges.len() == 1 {
let &(start, mut end) = ranges.first().unwrap();
// check if a range is not satisfiable
//
// this should be already taken care of by HttpRange::parse
// but checking here again for extra assurance
if start >= len || end >= len || end < start {
return Ok(not_satisfiable()?);
}
// adjust end byte for MAX_LEN
end = start + (end - start).min(len - start).min(MAX_LEN - 1);
// calculate number of bytes needed to be read
let bytes_to_read = end + 1 - start;
// allocate a buf with a suitable capacity
let mut buf = Vec::with_capacity(bytes_to_read as usize);
// seek the file to the starting byte
file.seek(SeekFrom::Start(start))?;
// read the needed bytes
file.take(bytes_to_read).read_to_end(&mut buf)?;
resp = resp.header(CONTENT_RANGE, format!("bytes {start}-{end}/{len}"));
resp = resp.header(CONTENT_LENGTH, end + 1 - start);
resp = resp.status(StatusCode::PARTIAL_CONTENT);
resp.body(buf)
} else {
let mut buf = Vec::new();
let ranges = ranges
.iter()
.filter_map(|&(start, mut end)| {
// filter out unsatisfiable ranges
//
// this should be already taken care of by HttpRange::parse
// but checking here again for extra assurance
if start >= len || end >= len || end < start {
None
} else {
// adjust end byte for MAX_LEN
end = start + (end - start).min(len - start).min(MAX_LEN - 1);
Some((start, end))
}
})
.collect::<Vec<_>>();
let boundary = random_boundary();
let boundary_sep = format!("\r\n--{boundary}\r\n");
let boundary_closer = format!("\r\n--{boundary}\r\n");
resp = resp.header(
CONTENT_TYPE,
format!("multipart/byteranges; boundary={boundary}"),
);
for (end, start) in ranges {
// a new range is being written, write the range boundary
buf.write_all(boundary_sep.as_bytes())?;
// write the needed headers `Content-Type` and `Content-Range`
buf.write_all(format!("{CONTENT_TYPE}: video/mp4\r\n").as_bytes())?;
buf.write_all(format!("{CONTENT_RANGE}: bytes {start}-{end}/{len}\r\n").as_bytes())?;
// write the separator to indicate the start of the range body
buf.write_all("\r\n".as_bytes())?;
// calculate number of bytes needed to be read
let bytes_to_read = end + 1 - start;
let mut local_buf = vec![0_u8; bytes_to_read as usize];
file.seek(SeekFrom::Start(start))?;
file.read_exact(&mut local_buf)?;
buf.extend_from_slice(&local_buf);
}
// all ranges have been written, write the closing boundary
buf.write_all(boundary_closer.as_bytes())?;
resp.body(buf)
}
} else {
resp = resp.header(CONTENT_LENGTH, len);
let mut buf = Vec::with_capacity(len as usize);
file.read_to_end(&mut buf)?;
resp.body(buf)
};
http_response.map_err(Into::into)
}
fn random_boundary() -> String {
let mut x = [0_u8; 30];
getrandom::fill(&mut x).expect("failed to get random bytes");
(x[..])
.iter()
.map(|&x| format!("{x:x}"))
.fold(String::new(), |mut a, x| {
a.push_str(x.as_str());
a
})
}
}