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129 lines
3.6 KiB
129 lines
3.6 KiB
// Copyright 2021 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package common
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import (
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"fmt"
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"io"
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"net/url"
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"path"
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"path/filepath"
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"strings"
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"time"
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charsetModule "code.gitea.io/gitea/modules/charset"
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"code.gitea.io/gitea/modules/context"
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"code.gitea.io/gitea/modules/git"
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"code.gitea.io/gitea/modules/httpcache"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/setting"
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"code.gitea.io/gitea/modules/typesniffer"
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"code.gitea.io/gitea/modules/util"
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)
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// ServeBlob download a git.Blob
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func ServeBlob(ctx *context.Context, blob *git.Blob, lastModified time.Time) error {
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if httpcache.HandleGenericETagTimeCache(ctx.Req, ctx.Resp, `"`+blob.ID.String()+`"`, lastModified) {
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return nil
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}
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dataRc, err := blob.DataAsync()
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if err != nil {
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return err
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}
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defer func() {
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if err = dataRc.Close(); err != nil {
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log.Error("ServeBlob: Close: %v", err)
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}
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}()
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return ServeData(ctx, ctx.Repo.TreePath, blob.Size(), dataRc)
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}
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// ServeData download file from io.Reader
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func ServeData(ctx *context.Context, filePath string, size int64, reader io.Reader) error {
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buf := make([]byte, 1024)
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n, err := util.ReadAtMost(reader, buf)
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if err != nil {
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return err
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}
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if n >= 0 {
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buf = buf[:n]
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}
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httpcache.AddCacheControlToHeader(ctx.Resp.Header(), 5*time.Minute)
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if size >= 0 {
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ctx.Resp.Header().Set("Content-Length", fmt.Sprintf("%d", size))
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} else {
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log.Error("ServeData called to serve data: %s with size < 0: %d", filePath, size)
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}
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fileName := path.Base(filePath)
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sniffedType := typesniffer.DetectContentType(buf)
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isPlain := sniffedType.IsText() || ctx.FormBool("render")
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mimeType := ""
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charset := ""
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if setting.MimeTypeMap.Enabled {
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fileExtension := strings.ToLower(filepath.Ext(fileName))
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mimeType = setting.MimeTypeMap.Map[fileExtension]
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}
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if mimeType == "" {
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if sniffedType.IsBrowsableBinaryType() {
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mimeType = sniffedType.GetMimeType()
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} else if isPlain {
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mimeType = "text/plain"
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} else {
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mimeType = typesniffer.ApplicationOctetStream
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}
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}
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if isPlain {
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charset, err = charsetModule.DetectEncoding(buf)
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if err != nil {
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log.Error("Detect raw file %s charset failed: %v, using by default utf-8", filePath, err)
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charset = "utf-8"
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}
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}
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if charset != "" {
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ctx.Resp.Header().Set("Content-Type", mimeType+"; charset="+strings.ToLower(charset))
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} else {
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ctx.Resp.Header().Set("Content-Type", mimeType)
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}
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ctx.Resp.Header().Set("X-Content-Type-Options", "nosniff")
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isSVG := sniffedType.IsSvgImage()
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// serve types that can present a security risk with CSP
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if isSVG {
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ctx.Resp.Header().Set("Content-Security-Policy", "default-src 'none'; style-src 'unsafe-inline'; sandbox")
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} else if sniffedType.IsPDF() {
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// no sandbox attribute for pdf as it breaks rendering in at least safari. this
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// should generally be safe as scripts inside PDF can not escape the PDF document
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// see https://bugs.chromium.org/p/chromium/issues/detail?id=413851 for more discussion
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ctx.Resp.Header().Set("Content-Security-Policy", "default-src 'none'; style-src 'unsafe-inline'")
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}
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disposition := "inline"
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if isSVG && !setting.UI.SVG.Enabled {
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disposition = "attachment"
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}
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// encode filename per https://datatracker.ietf.org/doc/html/rfc5987
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encodedFileName := `filename*=UTF-8''` + url.PathEscape(fileName)
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ctx.Resp.Header().Set("Content-Disposition", disposition+"; "+encodedFileName)
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ctx.Resp.Header().Set("Access-Control-Expose-Headers", "Content-Disposition")
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_, err = ctx.Resp.Write(buf)
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if err != nil {
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return err
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}
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_, err = io.Copy(ctx.Resp, reader)
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return err
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}
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