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Add ETag header (#15370) (#15552)

* Add ETag header.

* Comply with RFC 7232.

* Moved logic into httpcache.go

* Changed name.

* Lint

* Implemented If-None-Match list.

* Fixed missing header on *

* Removed weak etag support.

* Removed * support.

* Added unit test.

* Lint

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
mj-v1.14.3
KN4CK3R 1 year ago
committed by GitHub
parent
commit
5da024a019
No known key found for this signature in database GPG Key ID: 4AEE18F83AFDEB23
  1. 41
      modules/httpcache/httpcache.go
  2. 144
      modules/httpcache/httpcache_test.go
  3. 2
      modules/public/public.go
  4. 20
      routers/repo/attachment.go
  5. 13
      routers/repo/download.go

41
modules/httpcache/httpcache.go

@ -10,6 +10,7 @@ import (
"net/http"
"os"
"strconv"
"strings"
"time"
"code.gitea.io/gitea/modules/setting"
@ -26,11 +27,13 @@ func GetCacheControl() string {
// generateETag generates an ETag based on size, filename and file modification time
func generateETag(fi os.FileInfo) string {
etag := fmt.Sprint(fi.Size()) + fi.Name() + fi.ModTime().UTC().Format(http.TimeFormat)
return base64.StdEncoding.EncodeToString([]byte(etag))
return `"` + base64.StdEncoding.EncodeToString([]byte(etag)) + `"`
}
// HandleTimeCache handles time-based caching for a HTTP request
func HandleTimeCache(req *http.Request, w http.ResponseWriter, fi os.FileInfo) (handled bool) {
w.Header().Set("Cache-Control", GetCacheControl())
ifModifiedSince := req.Header.Get("If-Modified-Since")
if ifModifiedSince != "" {
t, err := time.Parse(http.TimeFormat, ifModifiedSince)
@ -40,20 +43,40 @@ func HandleTimeCache(req *http.Request, w http.ResponseWriter, fi os.FileInfo) (
}
}
w.Header().Set("Cache-Control", GetCacheControl())
w.Header().Set("Last-Modified", fi.ModTime().Format(http.TimeFormat))
return false
}
// HandleEtagCache handles ETag-based caching for a HTTP request
func HandleEtagCache(req *http.Request, w http.ResponseWriter, fi os.FileInfo) (handled bool) {
// HandleFileETagCache handles ETag-based caching for a HTTP request
func HandleFileETagCache(req *http.Request, w http.ResponseWriter, fi os.FileInfo) (handled bool) {
etag := generateETag(fi)
if req.Header.Get("If-None-Match") == etag {
w.WriteHeader(http.StatusNotModified)
return true
}
return HandleGenericETagCache(req, w, etag)
}
// HandleGenericETagCache handles ETag-based caching for a HTTP request.
// It returns true if the request was handled.
func HandleGenericETagCache(req *http.Request, w http.ResponseWriter, etag string) (handled bool) {
if len(etag) > 0 {
w.Header().Set("Etag", etag)
if checkIfNoneMatchIsValid(req, etag) {
w.WriteHeader(http.StatusNotModified)
return true
}
}
w.Header().Set("Cache-Control", GetCacheControl())
w.Header().Set("ETag", etag)
return false
}
// checkIfNoneMatchIsValid tests if the header If-None-Match matches the ETag
func checkIfNoneMatchIsValid(req *http.Request, etag string) bool {
ifNoneMatch := req.Header.Get("If-None-Match")
if len(ifNoneMatch) > 0 {
for _, item := range strings.Split(ifNoneMatch, ",") {
item = strings.TrimSpace(item)
if item == etag {
return true
}
}
}
return false
}

144
modules/httpcache/httpcache_test.go

@ -0,0 +1,144 @@
// Copyright 2021 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package httpcache
import (
"net/http"
"net/http/httptest"
"os"
"testing"
"time"
"github.com/stretchr/testify/assert"
)
type mockFileInfo struct {
}
func (m mockFileInfo) Name() string { return "gitea.test" }
func (m mockFileInfo) Size() int64 { return int64(10) }
func (m mockFileInfo) Mode() os.FileMode { return os.ModePerm }
func (m mockFileInfo) ModTime() time.Time { return time.Time{} }
func (m mockFileInfo) IsDir() bool { return false }
func (m mockFileInfo) Sys() interface{} { return nil }
func TestHandleFileETagCache(t *testing.T) {
fi := mockFileInfo{}
etag := `"MTBnaXRlYS50ZXN0TW9uLCAwMSBKYW4gMDAwMSAwMDowMDowMCBHTVQ="`
t.Run("No_If-None-Match", func(t *testing.T) {
req := &http.Request{Header: make(http.Header)}
w := httptest.NewRecorder()
handled := HandleFileETagCache(req, w, fi)
assert.False(t, handled)
assert.Len(t, w.Header(), 2)
assert.Contains(t, w.Header(), "Cache-Control")
assert.Contains(t, w.Header(), "Etag")
assert.Equal(t, etag, w.Header().Get("Etag"))
})
t.Run("Wrong_If-None-Match", func(t *testing.T) {
req := &http.Request{Header: make(http.Header)}
w := httptest.NewRecorder()
req.Header.Set("If-None-Match", `"wrong etag"`)
handled := HandleFileETagCache(req, w, fi)
assert.False(t, handled)
assert.Len(t, w.Header(), 2)
assert.Contains(t, w.Header(), "Cache-Control")
assert.Contains(t, w.Header(), "Etag")
assert.Equal(t, etag, w.Header().Get("Etag"))
})
t.Run("Correct_If-None-Match", func(t *testing.T) {
req := &http.Request{Header: make(http.Header)}
w := httptest.NewRecorder()
req.Header.Set("If-None-Match", etag)
handled := HandleFileETagCache(req, w, fi)
assert.True(t, handled)
assert.Len(t, w.Header(), 1)
assert.Contains(t, w.Header(), "Etag")
assert.Equal(t, etag, w.Header().Get("Etag"))
assert.Equal(t, http.StatusNotModified, w.Code)
})
}
func TestHandleGenericETagCache(t *testing.T) {
etag := `"test"`
t.Run("No_If-None-Match", func(t *testing.T) {
req := &http.Request{Header: make(http.Header)}
w := httptest.NewRecorder()
handled := HandleGenericETagCache(req, w, etag)
assert.False(t, handled)
assert.Len(t, w.Header(), 2)
assert.Contains(t, w.Header(), "Cache-Control")
assert.Contains(t, w.Header(), "Etag")
assert.Equal(t, etag, w.Header().Get("Etag"))
})
t.Run("Wrong_If-None-Match", func(t *testing.T) {
req := &http.Request{Header: make(http.Header)}
w := httptest.NewRecorder()
req.Header.Set("If-None-Match", `"wrong etag"`)
handled := HandleGenericETagCache(req, w, etag)
assert.False(t, handled)
assert.Len(t, w.Header(), 2)
assert.Contains(t, w.Header(), "Cache-Control")
assert.Contains(t, w.Header(), "Etag")
assert.Equal(t, etag, w.Header().Get("Etag"))
})
t.Run("Correct_If-None-Match", func(t *testing.T) {
req := &http.Request{Header: make(http.Header)}
w := httptest.NewRecorder()
req.Header.Set("If-None-Match", etag)
handled := HandleGenericETagCache(req, w, etag)
assert.True(t, handled)
assert.Len(t, w.Header(), 1)
assert.Contains(t, w.Header(), "Etag")
assert.Equal(t, etag, w.Header().Get("Etag"))
assert.Equal(t, http.StatusNotModified, w.Code)
})
t.Run("Multiple_Wrong_If-None-Match", func(t *testing.T) {
req := &http.Request{Header: make(http.Header)}
w := httptest.NewRecorder()
req.Header.Set("If-None-Match", `"wrong etag", "wrong etag "`)
handled := HandleGenericETagCache(req, w, etag)
assert.False(t, handled)
assert.Len(t, w.Header(), 2)
assert.Contains(t, w.Header(), "Cache-Control")
assert.Contains(t, w.Header(), "Etag")
assert.Equal(t, etag, w.Header().Get("Etag"))
})
t.Run("Multiple_Correct_If-None-Match", func(t *testing.T) {
req := &http.Request{Header: make(http.Header)}
w := httptest.NewRecorder()
req.Header.Set("If-None-Match", `"wrong etag", `+etag)
handled := HandleGenericETagCache(req, w, etag)
assert.True(t, handled)
assert.Len(t, w.Header(), 1)
assert.Contains(t, w.Header(), "Etag")
assert.Equal(t, etag, w.Header().Get("Etag"))
assert.Equal(t, http.StatusNotModified, w.Code)
})
}

2
modules/public/public.go

@ -165,7 +165,7 @@ func (opts *Options) handle(w http.ResponseWriter, req *http.Request, opt *Optio
log.Println("[Static] Serving " + file)
}
if httpcache.HandleEtagCache(req, w, fi) {
if httpcache.HandleFileETagCache(req, w, fi) {
return true
}

20
routers/repo/attachment.go

@ -10,6 +10,7 @@ import (
"code.gitea.io/gitea/models"
"code.gitea.io/gitea/modules/context"
"code.gitea.io/gitea/modules/httpcache"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/storage"
@ -124,21 +125,25 @@ func GetAttachment(ctx *context.Context) {
}
}
if err := attach.IncreaseDownloadCount(); err != nil {
ctx.ServerError("IncreaseDownloadCount", err)
return
}
if setting.Attachment.ServeDirect {
//If we have a signed url (S3, object storage), redirect to this directly.
u, err := storage.Attachments.URL(attach.RelativePath(), attach.Name)
if u != nil && err == nil {
if err := attach.IncreaseDownloadCount(); err != nil {
ctx.ServerError("Update", err)
return
}
ctx.Redirect(u.String())
return
}
}
if httpcache.HandleGenericETagCache(ctx.Req, ctx.Resp, `"`+attach.UUID+`"`) {
return
}
//If we have matched and access to release or issue
fr, err := storage.Attachments.Open(attach.RelativePath())
if err != nil {
@ -147,11 +152,6 @@ func GetAttachment(ctx *context.Context) {
}
defer fr.Close()
if err := attach.IncreaseDownloadCount(); err != nil {
ctx.ServerError("Update", err)
return
}
if err = ServeData(ctx, attach.Name, attach.Size, fr); err != nil {
ctx.ServerError("ServeData", err)
return

13
routers/repo/download.go

@ -15,6 +15,7 @@ import (
"code.gitea.io/gitea/modules/charset"
"code.gitea.io/gitea/modules/context"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/httpcache"
"code.gitea.io/gitea/modules/lfs"
"code.gitea.io/gitea/modules/log"
)
@ -31,6 +32,7 @@ func ServeData(ctx *context.Context, name string, size int64, reader io.Reader)
}
ctx.Resp.Header().Set("Cache-Control", "public,max-age=86400")
if size >= 0 {
ctx.Resp.Header().Set("Content-Length", fmt.Sprintf("%d", size))
} else {
@ -71,6 +73,10 @@ func ServeData(ctx *context.Context, name string, size int64, reader io.Reader)
// ServeBlob download a git.Blob
func ServeBlob(ctx *context.Context, blob *git.Blob) error {
if httpcache.HandleGenericETagCache(ctx.Req, ctx.Resp, `"`+blob.ID.String()+`"`) {
return nil
}
dataRc, err := blob.DataAsync()
if err != nil {
return err
@ -86,6 +92,10 @@ func ServeBlob(ctx *context.Context, blob *git.Blob) error {
// ServeBlobOrLFS download a git.Blob redirecting to LFS if necessary
func ServeBlobOrLFS(ctx *context.Context, blob *git.Blob) error {
if httpcache.HandleGenericETagCache(ctx.Req, ctx.Resp, `"`+blob.ID.String()+`"`) {
return nil
}
dataRc, err := blob.DataAsync()
if err != nil {
return err
@ -101,6 +111,9 @@ func ServeBlobOrLFS(ctx *context.Context, blob *git.Blob) error {
if meta == nil {
return ServeBlob(ctx, blob)
}
if httpcache.HandleGenericETagCache(ctx.Req, ctx.Resp, `"`+meta.Oid+`"`) {
return nil
}
lfsDataRc, err := lfs.ReadMetaObject(meta)
if err != nil {
return err

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