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Read expected buffer size (#17409) (#17430)

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Backport of #17409

* Read expected buffer size.

* Changed name.
This commit is contained in:
KN4CK3R 2021-10-25 18:46:56 +02:00 committed by GitHub
parent 06da10b9a1
commit 5159055278
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
11 changed files with 51 additions and 29 deletions
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5
modules/charset/charset.go
View file

@ -14,6 +14,7 @@ import (
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/util"
"github.com/gogs/chardet"
"golang.org/x/net/html/charset"
@ -26,9 +27,9 @@ var UTF8BOM = []byte{'\xef', '\xbb', '\xbf'}
// ToUTF8WithFallbackReader detects the encoding of content and coverts to UTF-8 reader if possible
func ToUTF8WithFallbackReader(rd io.Reader) io.Reader {
var buf = make([]byte, 2048)
n, err := rd.Read(buf)
n, err := util.ReadAtMost(rd, buf)
if err != nil {
return rd
return io.MultiReader(bytes.NewReader(RemoveBOMIfPresent(buf[:n])), rd)
}
charsetLabel, err := DetectEncoding(buf[:n])

5
modules/csv/csv.go
View file

@ -30,11 +30,8 @@ func CreateReader(input io.Reader, delimiter rune) *stdcsv.Reader {
// CreateReaderAndGuessDelimiter tries to guess the field delimiter from the content and creates a csv.Reader.
func CreateReaderAndGuessDelimiter(rd io.Reader) (*stdcsv.Reader, error) {
var data = make([]byte, 1e4)
size, err := rd.Read(data)
size, err := util.ReadAtMost(rd, data)
if err != nil {
if err == io.EOF {
return CreateReader(bytes.NewReader([]byte{}), rune(',')), nil
}
return nil, err
}

3
modules/git/blob.go
View file

@ -12,6 +12,7 @@ import (
"io/ioutil"
"code.gitea.io/gitea/modules/typesniffer"
"code.gitea.io/gitea/modules/util"
)
// This file contains common functions between the gogit and !gogit variants for git Blobs
@ -29,7 +30,7 @@ func (b *Blob) GetBlobContent() (string, error) {
}
defer dataRc.Close()
buf := make([]byte, 1024)
n, _ := dataRc.Read(buf)
n, _ := util.ReadAtMost(dataRc, buf)
buf = buf[:n]
return string(buf), nil
}

5
modules/repofiles/update.go
View file

@ -19,6 +19,7 @@ import (
repo_module "code.gitea.io/gitea/modules/repository"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/structs"
"code.gitea.io/gitea/modules/util"
stdcharset "golang.org/x/net/html/charset"
"golang.org/x/text/transform"
@ -61,7 +62,7 @@ func detectEncodingAndBOM(entry *git.TreeEntry, repo *models.Repository) (string
}
defer reader.Close()
buf := make([]byte, 1024)
n, err := reader.Read(buf)
n, err := util.ReadAtMost(reader, buf)
if err != nil {
// return default
return "UTF-8", false
@ -84,7 +85,7 @@ func detectEncodingAndBOM(entry *git.TreeEntry, repo *models.Repository) (string
}
defer dataRc.Close()
buf = make([]byte, 1024)
n, err = dataRc.Read(buf)
n, err = util.ReadAtMost(dataRc, buf)
if err != nil {
// return default
return "UTF-8", false

6
modules/typesniffer/typesniffer.go
View file

@ -10,6 +10,8 @@ import (
"net/http"
"regexp"
"strings"
"code.gitea.io/gitea/modules/util"
)
// Use at most this many bytes to determine Content Type.
@ -86,8 +88,8 @@ func DetectContentType(data []byte) SniffedType {
// DetectContentTypeFromReader guesses the content type contained in the reader.
func DetectContentTypeFromReader(r io.Reader) (SniffedType, error) {
buf := make([]byte, sniffLen)
n, err := r.Read(buf)
if err != nil && err != io.EOF {
n, err := util.ReadAtMost(r, buf)
if err != nil {
return SniffedType{}, fmt.Errorf("DetectContentTypeFromReader io error: %w", err)
}
buf = buf[:n]

20
modules/util/io.go Normal file
View file

@ -0,0 +1,20 @@
// 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 util
import (
"io"
)
// ReadAtMost reads at most len(buf) bytes from r into buf.
// It returns the number of bytes copied. n is only less then len(buf) if r provides fewer bytes.
// If EOF occurs while reading, err will be nil.
func ReadAtMost(r io.Reader, buf []byte) (n int, err error) {
n, err = io.ReadFull(r, buf)
if err == io.EOF || err == io.ErrUnexpectedEOF {
err = nil
}
return
}

5
routers/common/repo.go
View file

@ -18,6 +18,7 @@ import (
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/typesniffer"
"code.gitea.io/gitea/modules/util"
)
// ServeBlob download a git.Blob
@ -42,8 +43,8 @@ func ServeBlob(ctx *context.Context, blob *git.Blob) error {
// ServeData download file from io.Reader
func ServeData(ctx *context.Context, name string, size int64, reader io.Reader) error {
buf := make([]byte, 1024)
n, err := reader.Read(buf)
if err != nil && err != io.EOF {
n, err := util.ReadAtMost(reader, buf)
if err != nil {
return err
}
if n >= 0 {

5
routers/web/repo/attachment.go
View file

@ -15,6 +15,7 @@ import (
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/storage"
"code.gitea.io/gitea/modules/upload"
"code.gitea.io/gitea/modules/util"
"code.gitea.io/gitea/routers/common"
)
@ -43,10 +44,8 @@ func uploadAttachment(ctx *context.Context, allowedTypes string) {
defer file.Close()
buf := make([]byte, 1024)
n, _ := file.Read(buf)
if n > 0 {
n, _ := util.ReadAtMost(file, buf)
buf = buf[:n]
}
err = upload.Verify(buf, header.Filename, allowedTypes)
if err != nil {

4
routers/web/repo/editor.go
View file

@ -114,7 +114,7 @@ func editFile(ctx *context.Context, isNewFile bool) {
ctx.Data["FileName"] = blob.Name()
buf := make([]byte, 1024)
n, _ := dataRc.Read(buf)
n, _ := util.ReadAtMost(dataRc, buf)
buf = buf[:n]
// Only some file types are editable online as text.
@ -747,7 +747,7 @@ func UploadFileToServer(ctx *context.Context) {
defer file.Close()
buf := make([]byte, 1024)
n, _ := file.Read(buf)
n, _ := util.ReadAtMost(file, buf)
if n > 0 {
buf = buf[:n]
}

7
routers/web/repo/lfs.go
View file

@ -26,6 +26,7 @@ import (
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/storage"
"code.gitea.io/gitea/modules/typesniffer"
"code.gitea.io/gitea/modules/util"
)
const (
@ -272,7 +273,7 @@ func LFSFileGet(ctx *context.Context) {
}
defer dataRc.Close()
buf := make([]byte, 1024)
n, err := dataRc.Read(buf)
n, err := util.ReadAtMost(dataRc, buf)
if err != nil {
ctx.ServerError("Data", err)
return
@ -297,10 +298,10 @@ func LFSFileGet(ctx *context.Context) {
break
}
buf := charset.ToUTF8WithFallbackReader(io.MultiReader(bytes.NewReader(buf), dataRc))
rd := charset.ToUTF8WithFallbackReader(io.MultiReader(bytes.NewReader(buf), dataRc))
// Building code view blocks with line number on server side.
fileContent, _ := ioutil.ReadAll(buf)
fileContent, _ := ioutil.ReadAll(rd)
var output bytes.Buffer
lines := strings.Split(string(fileContent), "\n")

13
routers/web/repo/view.go
View file

@ -31,6 +31,7 @@ import (
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/structs"
"code.gitea.io/gitea/modules/typesniffer"
"code.gitea.io/gitea/modules/util"
)
const (
@ -264,7 +265,7 @@ func renderDirectory(ctx *context.Context, treeLink string) {
defer dataRc.Close()
buf := make([]byte, 1024)
n, _ := dataRc.Read(buf)
n, _ := util.ReadAtMost(dataRc, buf)
buf = buf[:n]
st := typesniffer.DetectContentType(buf)
@ -299,7 +300,7 @@ func renderDirectory(ctx *context.Context, treeLink string) {
defer dataRc.Close()
buf = make([]byte, 1024)
n, err = dataRc.Read(buf)
n, err = util.ReadAtMost(dataRc, buf)
if err != nil {
ctx.ServerError("Data", err)
return
@ -413,7 +414,7 @@ func renderFile(ctx *context.Context, entry *git.TreeEntry, treeLink, rawLink st
ctx.Data["RawFileLink"] = rawLink + "/" + ctx.Repo.TreePath
buf := make([]byte, 1024)
n, _ := dataRc.Read(buf)
n, _ := util.ReadAtMost(dataRc, buf)
buf = buf[:n]
st := typesniffer.DetectContentType(buf)
@ -445,10 +446,8 @@ func renderFile(ctx *context.Context, entry *git.TreeEntry, treeLink, rawLink st
defer dataRc.Close()
buf = make([]byte, 1024)
n, err = dataRc.Read(buf)
// Error EOF don't mean there is an error, it just means we read to
// the end
if err != nil && err != io.EOF {
n, err = util.ReadAtMost(dataRc, buf)
if err != nil {
ctx.ServerError("Data", err)
return
}