112 lines
3.2 KiB
Go
112 lines
3.2 KiB
Go
// 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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"path"
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"path/filepath"
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"strings"
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"time"
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"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, name 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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ctx.Resp.Header().Set("Cache-Control", "public,max-age=86400")
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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", name, size)
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}
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name = path.Base(name)
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// Google Chrome dislike commas in filenames, so let's change it to a space
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name = strings.ReplaceAll(name, ",", " ")
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st := typesniffer.DetectContentType(buf)
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mappedMimeType := ""
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if setting.MimeTypeMap.Enabled {
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fileExtension := strings.ToLower(filepath.Ext(name))
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mappedMimeType = setting.MimeTypeMap.Map[fileExtension]
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}
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if st.IsText() || ctx.FormBool("render") {
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cs, err := charset.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", name, err)
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cs = "utf-8"
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}
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if mappedMimeType == "" {
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mappedMimeType = "text/plain"
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}
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ctx.Resp.Header().Set("Content-Type", mappedMimeType+"; charset="+strings.ToLower(cs))
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} else {
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ctx.Resp.Header().Set("Access-Control-Expose-Headers", "Content-Disposition")
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if mappedMimeType != "" {
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ctx.Resp.Header().Set("Content-Type", mappedMimeType)
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}
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if (st.IsImage() || st.IsPDF()) && (setting.UI.SVG.Enabled || !st.IsSvgImage()) {
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ctx.Resp.Header().Set("Content-Disposition", fmt.Sprintf(`inline; filename="%s"`, name))
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if st.IsSvgImage() || st.IsPDF() {
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ctx.Resp.Header().Set("Content-Security-Policy", "default-src 'none'; style-src 'unsafe-inline'; sandbox")
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ctx.Resp.Header().Set("X-Content-Type-Options", "nosniff")
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if st.IsSvgImage() {
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ctx.Resp.Header().Set("Content-Type", typesniffer.SvgMimeType)
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} else {
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ctx.Resp.Header().Set("Content-Type", typesniffer.ApplicationOctetStream)
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}
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}
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} else {
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ctx.Resp.Header().Set("Content-Disposition", fmt.Sprintf(`attachment; filename="%s"`, name))
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}
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}
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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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