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package disk
import (
"io"
"mime"
"net/http"
"os"
"path/filepath"
"strings"
"gocloud.dev/blob"
"golang.org/x/sys/unix"
"gitlab.com/gitlab-org/gitlab-pages/internal/httputil"
)
func endsWithSlash(path string) bool {
return strings.HasSuffix(path, "/")
}
func endsWithoutHTMLExtension(path string) bool {
return !strings.HasSuffix(path, ".html")
}
func openNoFollow(path string) (*os.File, error) {
return os.OpenFile(path, os.O_RDONLY|unix.O_NOFOLLOW, 0)
}
// Detect file's content-type either by extension or mime-sniffing.
// Implementation is adapted from Golang's `http.serveContent()`
// See https://github.com/golang/go/blob/902fc114272978a40d2e65c2510a18e870077559/src/net/http/fs.go#L194
func (resp *responder) detectContentType(path string) (string, error) {
contentType := mime.TypeByExtension(filepath.Ext(path))
if contentType != "" {
return contentType, nil
}
var buf [512]byte
r, err := resp.bucket.NewRangeReader(resp.ctx, path, 0, int64(len(buf)), nil)
if err != nil {
return "", err
}
defer r.Close()
// Using `io.ReadFull()` because `file.Read()` may be chunked.
// Ignoring errors because we don't care if the 512 bytes cannot be read.
n, _ := io.ReadFull(r, buf[:])
contentType = http.DetectContentType(buf[:n])
return contentType, nil
}
func acceptsGZip(r *http.Request) bool {
if r.Header.Get("Range") != "" {
return false
}
offers := []string{"gzip", "identity"}
acceptedEncoding := httputil.NegotiateContentEncoding(r, offers)
return acceptedEncoding == "gzip"
}
func (resp *responder) handleGZip(w http.ResponseWriter, r *http.Request, key string) (string, *blob.Attributes, error) {
attrs, err := resp.bucket.Attributes(resp.ctx, key)
if err != nil {
return "", nil, err
}
if !acceptsGZip(r) {
return key, attrs, nil
}
gzipPath := key + ".gz"
gzipAttrs, err := resp.bucket.Attributes(resp.ctx, gzipPath)
if err != nil {
return key, attrs, nil
}
if resp.disk {
// Ensure the .gz file is not a symlink
if fi, err := os.Lstat(gzipPath); err != nil || !fi.Mode().IsRegular() {
return key, attrs, nil
}
}
w.Header().Set("Content-Encoding", "gzip")
return gzipPath, gzipAttrs, nil
}
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