mirror of
https://github.com/fafhrd91/actix-web
synced 2024-11-28 10:02:38 +01:00
573 lines
18 KiB
Rust
573 lines
18 KiB
Rust
//! Static files support.
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// //! TODO: needs to re-implement actual files handling, current impl blocks
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use std::{io, cmp};
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use std::io::{Read, Seek};
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use std::fmt::Write;
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use std::fs::{File, DirEntry, Metadata};
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use std::path::{Path, PathBuf};
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use std::ops::{Deref, DerefMut};
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use std::time::{SystemTime, UNIX_EPOCH};
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#[cfg(unix)]
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use std::os::unix::fs::MetadataExt;
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use bytes::{Bytes, BytesMut, BufMut};
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use http::{Method, StatusCode};
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use futures::{Async, Poll, Future, Stream};
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use futures_cpupool::{CpuPool, CpuFuture};
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use mime_guess::get_mime_type;
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use header;
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use error::Error;
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use param::FromParam;
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use handler::{Handler, Responder};
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use httpmessage::HttpMessage;
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use httprequest::HttpRequest;
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use httpresponse::HttpResponse;
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use httpcodes::{HttpOk, HttpFound, HttpMethodNotAllowed};
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/// A file with an associated name; responds with the Content-Type based on the
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/// file extension.
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#[derive(Debug)]
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pub struct NamedFile {
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path: PathBuf,
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file: File,
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md: Metadata,
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modified: Option<SystemTime>,
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cpu_pool: Option<CpuPool>,
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}
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impl NamedFile {
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/// Attempts to open a file in read-only mode.
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///
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/// # Examples
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///
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/// ```rust
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/// use actix_web::fs::NamedFile;
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///
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/// let file = NamedFile::open("foo.txt");
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/// ```
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pub fn open<P: AsRef<Path>>(path: P) -> io::Result<NamedFile> {
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let file = File::open(path.as_ref())?;
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let md = file.metadata()?;
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let path = path.as_ref().to_path_buf();
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let modified = md.modified().ok();
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let cpu_pool = None;
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Ok(NamedFile{path, file, md, modified, cpu_pool})
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}
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/// Returns reference to the underlying `File` object.
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#[inline]
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pub fn file(&self) -> &File {
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&self.file
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}
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/// Retrieve the path of this file.
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///
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/// # Examples
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///
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/// ```rust
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/// # use std::io;
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/// use actix_web::fs::NamedFile;
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///
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/// # fn path() -> io::Result<()> {
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/// let file = NamedFile::open("test.txt")?;
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/// assert_eq!(file.path().as_os_str(), "foo.txt");
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/// # Ok(())
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/// # }
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/// ```
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#[inline]
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pub fn path(&self) -> &Path {
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self.path.as_path()
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}
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/// Set `CpuPool` to use
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#[inline]
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pub fn set_cpu_pool(mut self, cpu_pool: CpuPool) -> Self {
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self.cpu_pool = Some(cpu_pool);
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self
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}
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fn etag(&self) -> Option<header::EntityTag> {
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// This etag format is similar to Apache's.
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self.modified.as_ref().map(|mtime| {
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let ino = {
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#[cfg(unix)]
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{ self.md.ino() }
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#[cfg(not(unix))]
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{ 0 }
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};
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let dur = mtime.duration_since(UNIX_EPOCH)
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.expect("modification time must be after epoch");
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header::EntityTag::strong(
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format!("{:x}:{:x}:{:x}:{:x}",
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ino, self.md.len(), dur.as_secs(),
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dur.subsec_nanos()))
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})
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}
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fn last_modified(&self) -> Option<header::HttpDate> {
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self.modified.map(|mtime| mtime.into())
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}
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}
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impl Deref for NamedFile {
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type Target = File;
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fn deref(&self) -> &File {
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&self.file
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}
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}
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impl DerefMut for NamedFile {
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fn deref_mut(&mut self) -> &mut File {
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&mut self.file
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}
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}
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/// Returns true if `req` has no `If-Match` header or one which matches `etag`.
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fn any_match(etag: Option<&header::EntityTag>, req: &HttpRequest) -> bool {
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match req.get_header::<header::IfMatch>() {
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None | Some(header::IfMatch::Any) => true,
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Some(header::IfMatch::Items(ref items)) => {
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if let Some(some_etag) = etag {
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for item in items {
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if item.strong_eq(some_etag) {
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return true;
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}
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}
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}
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false
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}
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}
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}
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/// Returns true if `req` doesn't have an `If-None-Match` header matching `req`.
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fn none_match(etag: Option<&header::EntityTag>, req: &HttpRequest) -> bool {
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match req.get_header::<header::IfNoneMatch>() {
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Some(header::IfNoneMatch::Any) => false,
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Some(header::IfNoneMatch::Items(ref items)) => {
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if let Some(some_etag) = etag {
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for item in items {
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if item.weak_eq(some_etag) {
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return false;
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}
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}
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}
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true
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}
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None => true,
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}
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}
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impl Responder for NamedFile {
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type Item = HttpResponse;
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type Error = io::Error;
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fn respond_to(self, req: HttpRequest) -> Result<HttpResponse, io::Error> {
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if *req.method() != Method::GET && *req.method() != Method::HEAD {
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return Ok(HttpMethodNotAllowed.build()
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.header(header::http::CONTENT_TYPE, "text/plain")
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.header(header::http::ALLOW, "GET, HEAD")
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.body("This resource only supports GET and HEAD.").unwrap())
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}
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let etag = self.etag();
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let last_modified = self.last_modified();
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// check preconditions
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let precondition_failed = if !any_match(etag.as_ref(), &req) {
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true
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} else if let (Some(ref m), Some(header::IfUnmodifiedSince(ref since))) =
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(last_modified, req.get_header())
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{
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m > since
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} else {
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false
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};
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// check last modified
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let not_modified = if !none_match(etag.as_ref(), &req) {
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true
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} else if let (Some(ref m), Some(header::IfModifiedSince(ref since))) =
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(last_modified, req.get_header())
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{
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m <= since
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} else {
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false
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};
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let mut resp = HttpOk.build();
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resp
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.if_some(self.path().extension(), |ext, resp| {
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resp.set(header::ContentType(get_mime_type(&ext.to_string_lossy())));
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})
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.if_some(last_modified, |lm, resp| {resp.set(header::LastModified(lm));})
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.if_some(etag, |etag, resp| {resp.set(header::ETag(etag));});
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if precondition_failed {
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return Ok(resp.status(StatusCode::PRECONDITION_FAILED).finish().unwrap())
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} else if not_modified {
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return Ok(resp.status(StatusCode::NOT_MODIFIED).finish().unwrap())
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}
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if *req.method() == Method::GET {
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let reader = ChunkedReadFile {
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size: self.md.len(),
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offset: 0,
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cpu_pool: self.cpu_pool.unwrap_or_else(|| req.cpu_pool().clone()),
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file: Some(self.file),
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fut: None,
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};
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Ok(resp.streaming(reader).unwrap())
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} else {
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Ok(resp.finish().unwrap())
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}
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}
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}
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/// A helper created from a `std::fs::File` which reads the file
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/// chunk-by-chunk on a `CpuPool`.
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pub struct ChunkedReadFile {
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size: u64,
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offset: u64,
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cpu_pool: CpuPool,
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file: Option<File>,
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fut: Option<CpuFuture<(File, Bytes), io::Error>>,
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}
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impl Stream for ChunkedReadFile {
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type Item = Bytes;
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type Error= Error;
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fn poll(&mut self) -> Poll<Option<Bytes>, Error> {
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if self.fut.is_some() {
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return match self.fut.as_mut().unwrap().poll()? {
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Async::Ready((file, bytes)) => {
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self.fut.take();
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self.file = Some(file);
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self.offset += bytes.len() as u64;
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Ok(Async::Ready(Some(bytes)))
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},
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Async::NotReady => Ok(Async::NotReady),
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};
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}
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let size = self.size;
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let offset = self.offset;
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if size == offset {
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Ok(Async::Ready(None))
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} else {
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let mut file = self.file.take().expect("Use after completion");
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self.fut = Some(self.cpu_pool.spawn_fn(move || {
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let max_bytes = cmp::min(size.saturating_sub(offset), 65_536) as usize;
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let mut buf = BytesMut::with_capacity(max_bytes);
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file.seek(io::SeekFrom::Start(offset))?;
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let nbytes = file.read(unsafe{buf.bytes_mut()})?;
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if nbytes == 0 {
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return Err(io::ErrorKind::UnexpectedEof.into())
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}
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unsafe{buf.advance_mut(nbytes)};
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Ok((file, buf.freeze()))
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}));
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self.poll()
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}
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}
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}
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/// A directory; responds with the generated directory listing.
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#[derive(Debug)]
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pub struct Directory{
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base: PathBuf,
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path: PathBuf
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}
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impl Directory {
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pub fn new(base: PathBuf, path: PathBuf) -> Directory {
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Directory { base, path }
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}
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fn can_list(&self, entry: &io::Result<DirEntry>) -> bool {
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if let Ok(ref entry) = *entry {
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if let Some(name) = entry.file_name().to_str() {
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if name.starts_with('.') {
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return false
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}
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}
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if let Ok(ref md) = entry.metadata() {
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let ft = md.file_type();
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return ft.is_dir() || ft.is_file() || ft.is_symlink()
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}
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}
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false
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}
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}
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impl Responder for Directory {
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type Item = HttpResponse;
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type Error = io::Error;
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fn respond_to(self, req: HttpRequest) -> Result<HttpResponse, io::Error> {
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let index_of = format!("Index of {}", req.path());
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let mut body = String::new();
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let base = Path::new(req.path());
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for entry in self.path.read_dir()? {
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if self.can_list(&entry) {
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let entry = entry.unwrap();
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let p = match entry.path().strip_prefix(&self.path) {
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Ok(p) => base.join(p),
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Err(_) => continue
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};
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// show file url as relative to static path
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let file_url = format!("{}", p.to_string_lossy());
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// if file is a directory, add '/' to the end of the name
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if let Ok(metadata) = entry.metadata() {
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if metadata.is_dir() {
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let _ = write!(body, "<li><a href=\"{}\">{}/</a></li>",
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file_url, entry.file_name().to_string_lossy());
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} else {
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let _ = write!(body, "<li><a href=\"{}\">{}</a></li>",
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file_url, entry.file_name().to_string_lossy());
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}
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} else {
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continue
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}
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}
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}
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let html = format!("<html>\
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<head><title>{}</title></head>\
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<body><h1>{}</h1>\
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<ul>\
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{}\
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</ul></body>\n</html>", index_of, index_of, body);
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Ok(HttpOk.build()
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.content_type("text/html; charset=utf-8")
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.body(html).unwrap())
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}
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}
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/// This enum represents all filesystem elements.
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pub enum FilesystemElement {
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File(NamedFile),
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Directory(Directory),
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Redirect(HttpResponse),
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}
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impl Responder for FilesystemElement {
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type Item = HttpResponse;
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type Error = io::Error;
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fn respond_to(self, req: HttpRequest) -> Result<HttpResponse, io::Error> {
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match self {
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FilesystemElement::File(file) => file.respond_to(req),
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FilesystemElement::Directory(dir) => dir.respond_to(req),
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FilesystemElement::Redirect(resp) => Ok(resp),
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}
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}
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}
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/// Static files handling
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///
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/// `StaticFile` handler must be registered with `Application::handler()` method,
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/// because `StaticFile` handler requires access sub-path information.
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///
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/// ```rust
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/// # extern crate actix_web;
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/// use actix_web::{fs, Application};
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///
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/// fn main() {
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/// let app = Application::new()
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/// .handler("/static", fs::StaticFiles::new(".", true))
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/// .finish();
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/// }
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/// ```
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pub struct StaticFiles {
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directory: PathBuf,
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accessible: bool,
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index: Option<String>,
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show_index: bool,
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cpu_pool: CpuPool,
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_chunk_size: usize,
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_follow_symlinks: bool,
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}
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impl StaticFiles {
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/// Create new `StaticFiles` instance
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///
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/// `dir` - base directory
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///
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/// `index` - show index for directory
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pub fn new<T: Into<PathBuf>>(dir: T, index: bool) -> StaticFiles {
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let dir = dir.into();
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let (dir, access) = match dir.canonicalize() {
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Ok(dir) => {
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if dir.is_dir() {
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(dir, true)
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} else {
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warn!("Is not directory `{:?}`", dir);
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(dir, false)
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}
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},
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Err(err) => {
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warn!("Static files directory `{:?}` error: {}", dir, err);
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(dir, false)
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}
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};
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StaticFiles {
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directory: dir,
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accessible: access,
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index: None,
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show_index: index,
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cpu_pool: CpuPool::new(40),
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_chunk_size: 0,
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_follow_symlinks: false,
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}
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}
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/// Set index file
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///
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/// Redirects to specific index file for directory "/" instead of
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/// showing files listing.
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pub fn index_file<T: Into<String>>(mut self, index: T) -> StaticFiles {
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self.index = Some(index.into());
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self
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}
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}
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impl<S> Handler<S> for StaticFiles {
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type Result = Result<FilesystemElement, io::Error>;
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fn handle(&mut self, req: HttpRequest<S>) -> Self::Result {
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if !self.accessible {
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Err(io::Error::new(io::ErrorKind::NotFound, "not found"))
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} else {
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let path = if let Some(path) = req.match_info().get("tail") {
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path
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} else {
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return Err(io::Error::new(io::ErrorKind::NotFound, "not found"))
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};
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let relpath = PathBuf::from_param(path)
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.map_err(|_| io::Error::new(io::ErrorKind::NotFound, "not found"))?;
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// full filepath
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let path = self.directory.join(&relpath).canonicalize()?;
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if path.is_dir() {
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if let Some(ref redir_index) = self.index {
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// TODO: Don't redirect, just return the index content.
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// TODO: It'd be nice if there were a good usable URL manipulation library
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let mut new_path: String = req.path().to_owned();
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for el in relpath.iter() {
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new_path.push_str(&el.to_string_lossy());
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new_path.push('/');
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}
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new_path.push_str(redir_index);
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Ok(FilesystemElement::Redirect(
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HttpFound
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.build()
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.header(header::http::LOCATION, new_path.as_str())
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.finish().unwrap()))
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} else if self.show_index {
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Ok(FilesystemElement::Directory(
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Directory::new(self.directory.clone(), path)))
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} else {
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Err(io::Error::new(io::ErrorKind::NotFound, "not found"))
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}
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} else {
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Ok(FilesystemElement::File(
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NamedFile::open(path)?.set_cpu_pool(self.cpu_pool.clone())))
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}
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use test::TestRequest;
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use http::{header, Method, StatusCode};
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#[test]
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fn test_named_file() {
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assert!(NamedFile::open("test--").is_err());
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let mut file = NamedFile::open("Cargo.toml").unwrap()
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.set_cpu_pool(CpuPool::new(1));
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{ file.file();
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let _f: &File = &file; }
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{ let _f: &mut File = &mut file; }
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let resp = file.respond_to(HttpRequest::default()).unwrap();
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assert_eq!(resp.headers().get(header::CONTENT_TYPE).unwrap(), "text/x-toml")
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}
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#[test]
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fn test_named_file_not_allowed() {
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let req = TestRequest::default().method(Method::POST).finish();
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let file = NamedFile::open("Cargo.toml").unwrap();
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let resp = file.respond_to(req).unwrap();
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assert_eq!(resp.status(), StatusCode::METHOD_NOT_ALLOWED);
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}
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#[test]
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fn test_static_files() {
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let mut st = StaticFiles::new(".", true);
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st.accessible = false;
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assert!(st.handle(HttpRequest::default()).is_err());
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st.accessible = true;
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st.show_index = false;
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assert!(st.handle(HttpRequest::default()).is_err());
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let mut req = HttpRequest::default();
|
|
req.match_info_mut().add("tail", "");
|
|
|
|
st.show_index = true;
|
|
let resp = st.handle(req).respond_to(HttpRequest::default()).unwrap();
|
|
assert_eq!(resp.headers().get(header::CONTENT_TYPE).unwrap(), "text/html; charset=utf-8");
|
|
assert!(resp.body().is_binary());
|
|
assert!(format!("{:?}", resp.body()).contains("README.md"));
|
|
}
|
|
|
|
#[test]
|
|
fn test_redirect_to_index() {
|
|
let mut st = StaticFiles::new(".", false).index_file("index.html");
|
|
let mut req = HttpRequest::default();
|
|
req.match_info_mut().add("tail", "guide");
|
|
|
|
let resp = st.handle(req).respond_to(HttpRequest::default()).unwrap();
|
|
assert_eq!(resp.status(), StatusCode::FOUND);
|
|
assert_eq!(resp.headers().get(header::LOCATION).unwrap(), "/guide/index.html");
|
|
|
|
let mut req = HttpRequest::default();
|
|
req.match_info_mut().add("tail", "guide/");
|
|
|
|
let resp = st.handle(req).respond_to(HttpRequest::default()).unwrap();
|
|
assert_eq!(resp.status(), StatusCode::FOUND);
|
|
assert_eq!(resp.headers().get(header::LOCATION).unwrap(), "/guide/index.html");
|
|
}
|
|
|
|
#[test]
|
|
fn test_redirect_to_index_nested() {
|
|
let mut st = StaticFiles::new(".", false).index_file("Cargo.toml");
|
|
let mut req = HttpRequest::default();
|
|
req.match_info_mut().add("tail", "examples/basics");
|
|
|
|
let resp = st.handle(req).respond_to(HttpRequest::default()).unwrap();
|
|
assert_eq!(resp.status(), StatusCode::FOUND);
|
|
assert_eq!(resp.headers().get(header::LOCATION).unwrap(), "/examples/basics/Cargo.toml");
|
|
}
|
|
}
|