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main.rs
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main.rs
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// Copyright 2019-2024 Tauri Programme within The Commons Conservancy
// SPDX-License-Identifier: Apache-2.0
// SPDX-License-Identifier: MIT
#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]
use http::{header::*, response::Builder as ResponseBuilder, status::StatusCode};
use http_range::HttpRange;
use std::{
io::{Read, Seek, SeekFrom, Write},
path::PathBuf,
process::{Command, Stdio},
};
fn main() {
let video_file = PathBuf::from("test_video.mp4");
let video_url =
"http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4";
if !video_file.exists() {
// Downloading with curl this saves us from adding
// a Rust HTTP client dependency.
println!("Downloading {video_url}");
let status = Command::new("curl")
.arg("-L")
.arg("-o")
.arg(&video_file)
.arg(video_url)
.stdout(Stdio::inherit())
.stderr(Stdio::inherit())
.output()
.unwrap();
assert!(status.status.success());
assert!(video_file.exists());
}
tauri::Builder::default()
.invoke_handler(tauri::generate_handler![video_uri])
.register_asynchronous_uri_scheme_protocol("stream", move |_app, request, responder| {
match get_stream_response(request) {
Ok(http_response) => responder.respond(http_response),
Err(e) => responder.respond(
ResponseBuilder::new()
.status(StatusCode::INTERNAL_SERVER_ERROR)
.header(CONTENT_TYPE, "text/plain")
.body(e.to_string().as_bytes().to_vec())
.unwrap(),
),
}
})
.run(tauri::generate_context!(
"../../examples/streaming/tauri.conf.json"
))
.expect("error while running tauri application");
}
// returns the scheme and the path of the video file
// we're using this just to allow using the custom `stream` protocol or tauri built-in `asset` protocol
#[tauri::command]
fn video_uri() -> (&'static str, std::path::PathBuf) {
#[cfg(feature = "protocol-asset")]
{
let mut path = std::env::current_dir().unwrap();
path.push("test_video.mp4");
("asset", path)
}
#[cfg(not(feature = "protocol-asset"))]
("stream", "test_video.mp4".into())
}
fn get_stream_response(
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()[1..].as_bytes())
.decode_utf8_lossy()
.to_string();
if path != "test_video.mp4" {
// return error 404 if it's not our video
return Ok(ResponseBuilder::new().status(404).body(Vec::new())?);
}
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 = ResponseBuilder::new().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 = || {
ResponseBuilder::new()
.status(StatusCode::RANGE_NOT_SATISFIABLE)
.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::getrandom(&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
})
}