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use crate::streamer::Streamer;
use bmart_derive::EnumStr;
use hyper::{http, Body, Response, StatusCode};
use sha2::{Digest, Sha256};
use std::io::SeekFrom;
use std::path::Path;
use std::time::SystemTime;
use tokio::fs::File;
use tokio::io::AsyncSeekExt;
pub static DEFAULT_MIME_TYPE: &str = "application/octet-stream";
#[derive(Debug, EnumStr, Copy, Clone, Eq, PartialEq)]
pub enum ErrorKind {
Internal,
Forbidden,
NotFound,
BadRequest,
}
#[derive(Debug)]
pub struct Error {
kind: ErrorKind,
source: Option<Box<dyn std::error::Error + 'static>>,
}
impl Error {
#[inline]
pub fn kind(&self) -> ErrorKind {
self.kind
}
#[inline]
pub fn bad_req() -> Self {
Self {
kind: ErrorKind::BadRequest,
source: None,
}
}
#[inline]
pub fn forbidden() -> Self {
Self {
kind: ErrorKind::Forbidden,
source: None,
}
}
#[inline]
pub fn internal(source: impl std::error::Error + 'static) -> Self {
Self {
kind: ErrorKind::Forbidden,
source: Some(Box::new(source)),
}
}
}
impl From<Error> for Result<Response<Body>, http::Error> {
fn from(err: Error) -> Self {
let code = match err.kind() {
ErrorKind::Internal => StatusCode::INTERNAL_SERVER_ERROR,
ErrorKind::Forbidden => StatusCode::FORBIDDEN,
ErrorKind::NotFound => StatusCode::NOT_FOUND,
ErrorKind::BadRequest => StatusCode::BAD_REQUEST,
};
Response::builder().status(code).body(Body::empty())
}
}
impl std::fmt::Display for Error {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "parse error")
}
}
impl std::error::Error for Error {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
self.source.as_ref().map(AsRef::as_ref)
}
}
struct Range {
start: u64,
end: Option<u64>,
}
fn parse_range(range_hdr: &hyper::header::HeaderValue) -> Result<Range, Error> {
let hdr = range_hdr.to_str().map_err(|_| Error::bad_req())?;
let mut sp = hdr.splitn(2, '=');
let units = sp.next().unwrap();
if units == "bytes" {
let range = sp.next().ok_or_else(Error::bad_req)?;
let mut sp_range = range.splitn(2, '-');
let start: u64 = sp_range
.next()
.unwrap()
.parse()
.map_err(|_| Error::bad_req())?;
let end: Option<u64> = if let Some(end) = sp_range.next() {
if end.is_empty() {
None
} else {
Some(end.parse().map_err(|_| Error::bad_req())?)
}
} else {
None
};
Ok(Range { start, end })
} else {
Err(Error::bad_req())
}
}
macro_rules! partial_resp {
($l: expr, $et: expr, $mt: expr) => {
Response::builder()
.status(StatusCode::PARTIAL_CONTENT)
.header(hyper::header::ACCEPT_RANGES, "bytes")
.header(
hyper::header::LAST_MODIFIED,
$l.format("%a, %d %b %Y %T GMT").to_string(),
)
.header("ETag", $et)
.header(
hyper::header::CONTENT_TYPE,
$mt.unwrap_or(DEFAULT_MIME_TYPE),
)
};
}
pub async fn static_file<'a>(
file_path: &Path,
mime_type: Option<&str>,
map: &hyper::header::HeaderMap,
buf_size: usize,
) -> Result<Result<Response<Body>, http::Error>, Error> {
macro_rules! forbidden {
() => {
return Err(Error::forbidden())
};
}
macro_rules! int_error {
($err: expr) => {
return Err(Error::internal($err))
};
}
let range = if let Some(range_hdr) = map.get(hyper::header::RANGE) {
Some(parse_range(range_hdr)?)
} else {
None
};
let (mut f, size, last_modified, etag) = match File::open(file_path).await {
Ok(v) => {
let (size, last_modified) = match v.metadata().await {
Ok(m) => {
if m.is_dir() {
forbidden!();
}
let last_modified = match m.modified() {
Ok(v) => v,
Err(e) => {
int_error!(e);
}
};
(m.len(), last_modified)
}
Err(e) => {
int_error!(e);
}
};
let timestamp = match last_modified.duration_since(SystemTime::UNIX_EPOCH) {
Ok(v) => v,
Err(e) => {
int_error!(e);
}
};
let mut hasher = Sha256::new();
hasher.update(file_path.to_string_lossy().as_bytes());
hasher.update(timestamp.as_secs().to_le_bytes());
hasher.update(timestamp.subsec_nanos().to_le_bytes());
(
v,
size,
Into::<chrono::DateTime<chrono::Utc>>::into(last_modified)
.with_timezone(&chrono_tz::GMT),
format!(r#""{}""#, hex::encode(hasher.finalize())),
)
}
Err(e) if e.kind() == std::io::ErrorKind::PermissionDenied => {
forbidden!();
}
Err(e) if e.kind() == std::io::ErrorKind::NotFound => {
return Err(Error {
kind: ErrorKind::NotFound,
source: None,
});
}
Err(e) => {
int_error!(e);
}
};
Ok(if let Some(rn) = range {
if rn.end.map_or_else(|| rn.start < size, |v| v >= rn.start)
&& f.seek(SeekFrom::Start(rn.start)).await.is_ok()
{
let part_size = rn
.end
.map_or_else(|| size - rn.start, |end| end - rn.start + 1);
let reader = Streamer::new(f, buf_size);
partial_resp!(last_modified, etag, mime_type)
.header(
hyper::header::CONTENT_RANGE,
format!("bytes {}-{}/{}", rn.start, rn.end.unwrap_or(size - 1), size),
)
.header(hyper::header::CONTENT_LENGTH, part_size)
.body(Body::wrap_stream(reader.into_stream_sized(part_size)))
} else {
Response::builder()
.status(StatusCode::RANGE_NOT_SATISFIABLE)
.header(hyper::header::ACCEPT_RANGES, "bytes")
.header(hyper::header::CONTENT_RANGE, format!("*/{}", size))
.body(Body::empty())
}
} else {
let reader = Streamer::new(f, buf_size);
partial_resp!(last_modified, etag, mime_type)
.header(hyper::header::CONTENT_LENGTH, size)
.body(Body::wrap_stream(reader.into_stream()))
})
}
