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package disk
import (
"context"
"io"
"mime"
"net/http"
"path/filepath"
"strconv"
"strings"
contentencoding "gitlab.com/feistel/go-contentencoding/encoding"
"gitlab.com/gitlab-org/gitlab-pages/internal/vfs"
)
var (
// Server side content encoding priority.
supportedEncodings = contentencoding.Preference{
contentencoding.Brotli: 1.0,
contentencoding.Gzip: 0.5,
contentencoding.Identity: 0.1,
}
compressedEncodings = map[string]string{
contentencoding.Brotli: ".br",
contentencoding.Gzip: ".gz",
}
)
func endsWithSlash(path string) bool {
return strings.HasSuffix(path, "/")
}
func endsWithoutHTMLExtension(path string) bool {
return !strings.HasSuffix(path, ".html")
}
// 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 (reader *Reader) detectContentType(ctx context.Context, root vfs.Root, path string) (string, error) {
contentType := mime.TypeByExtension(filepath.Ext(path))
if contentType == "" {
var buf [512]byte
file, err := root.Open(ctx, path)
if err != nil {
return "", err
}
defer file.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(file, buf[:])
contentType = http.DetectContentType(buf[:n])
}
return contentType, nil
}
func (reader *Reader) handleContentEncoding(ctx context.Context, w http.ResponseWriter, r *http.Request, root vfs.Root, fullPath string) string {
// don't accept range requests for compressed content
if r.Header.Get("Range") != "" {
return fullPath
}
acceptHeader := r.Header.Get("Accept-Encoding")
// don't send compressed content if there's no accept-encoding header
if acceptHeader == "" {
return fullPath
}
results, err := supportedEncodings.Negotiate(acceptHeader, contentencoding.AliasIdentity)
if err != nil {
return fullPath
}
if len(results) == 0 {
return fullPath
}
for _, encoding := range results {
if encoding == contentencoding.Identity {
break
}
extension := compressedEncodings[encoding]
path := fullPath + extension
// Ensure the file is not a symlink
if fi, err := root.Lstat(ctx, path); err == nil && fi.Mode().IsRegular() {
w.Header().Set("Content-Encoding", encoding)
// http.ServeContent doesn't set Content-Length if Content-Encoding is set
w.Header().Set("Content-Length", strconv.FormatInt(fi.Size(), 10))
return path
}
}
return fullPath
}
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