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file_server: use the UTC timezone for modified time (#6830)

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* use UTC timezone for modified time

* use http.ParseTime to handle If-Modified-Since

* use time.Compare to simplify comparison

* take the directory's modtime into consideration when calculating lastModified

* update comments about If-Modified-Since's handling
This commit is contained in:
WeidiDeng 2025-02-10 23:39:43 +08:00 committed by GitHub
parent 9b74a53e51
commit 22563a70eb
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GPG key ID: B5690EEEBB952194
2 changed files with 18 additions and 8 deletions
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13
modules/caddyhttp/fileserver/browse.go
View file

@ -130,9 +130,9 @@ func (fsrv *FileServer) serveBrowse(fileSystem fs.FS, root, dirPath string, w ht
// speed up browser/client experience and caching by supporting If-Modified-Since
if ifModSinceStr := r.Header.Get("If-Modified-Since"); ifModSinceStr != "" {
ifModSince, err := time.ParseInLocation(http.TimeFormat, ifModSinceStr, time.Local)
lastModTrunc := listing.lastModified.Truncate(time.Second)
if err == nil && (lastModTrunc.Equal(ifModSince) || lastModTrunc.Before(ifModSince)) {
// basically a copy of stdlib file server's handling of If-Modified-Since
ifModSince, err := http.ParseTime(ifModSinceStr)
if err == nil && listing.lastModified.Truncate(time.Second).Compare(ifModSince) <= 0 {
w.WriteHeader(http.StatusNotModified)
return nil
}
@ -213,6 +213,11 @@ func (fsrv *FileServer) serveBrowse(fileSystem fs.FS, root, dirPath string, w ht
}
func (fsrv *FileServer) loadDirectoryContents(ctx context.Context, fileSystem fs.FS, dir fs.ReadDirFile, root, urlPath string, repl *caddy.Replacer) (*browseTemplateContext, error) {
// modTime for the directory itself
stat, err := dir.Stat()
if err != nil {
return nil, err
}
dirLimit := defaultDirEntryLimit
if fsrv.Browse.FileLimit != 0 {
dirLimit = fsrv.Browse.FileLimit
@ -225,7 +230,7 @@ func (fsrv *FileServer) loadDirectoryContents(ctx context.Context, fileSystem fs
// user can presumably browse "up" to parent folder if path is longer than "/"
canGoUp := len(urlPath) > 1
return fsrv.directoryListing(ctx, fileSystem, files, canGoUp, root, urlPath, repl), nil
return fsrv.directoryListing(ctx, fileSystem, stat.ModTime(), files, canGoUp, root, urlPath, repl), nil
}
// browseApplyQueryParams applies query parameters to the listing.

7
modules/caddyhttp/fileserver/browsetplcontext.go
View file

@ -35,7 +35,7 @@ import (
"github.com/caddyserver/caddy/v2/modules/caddyhttp"
)
func (fsrv *FileServer) directoryListing(ctx context.Context, fileSystem fs.FS, entries []fs.DirEntry, canGoUp bool, root, urlPath string, repl *caddy.Replacer) *browseTemplateContext {
func (fsrv *FileServer) directoryListing(ctx context.Context, fileSystem fs.FS, parentModTime time.Time, entries []fs.DirEntry, canGoUp bool, root, urlPath string, repl *caddy.Replacer) *browseTemplateContext {
filesToHide := fsrv.transformHidePaths(repl)
name, _ := url.PathUnescape(urlPath)
@ -44,6 +44,7 @@ func (fsrv *FileServer) directoryListing(ctx context.Context, fileSystem fs.FS,
Name: path.Base(name),
Path: urlPath,
CanGoUp: canGoUp,
lastModified: parentModTime,
}
for _, entry := range entries {
@ -131,6 +132,10 @@ func (fsrv *FileServer) directoryListing(ctx context.Context, fileSystem fs.FS,
})
}
// this time is used for the Last-Modified header and comparing If-Modified-Since from client
// both are expected to be in UTC, so we convert to UTC here
// see: https://github.com/caddyserver/caddy/issues/6828
tplCtx.lastModified = tplCtx.lastModified.UTC()
return tplCtx
}