code.gitea.io/gitea@v1.22.3/routers/web/repo/render.go (about)

     1  // Copyright 2022 The Gitea Authors. All rights reserved.
     2  // SPDX-License-Identifier: MIT
     3  
     4  package repo
     5  
     6  import (
     7  	"bytes"
     8  	"io"
     9  	"net/http"
    10  	"path"
    11  
    12  	"code.gitea.io/gitea/modules/charset"
    13  	"code.gitea.io/gitea/modules/git"
    14  	"code.gitea.io/gitea/modules/log"
    15  	"code.gitea.io/gitea/modules/markup"
    16  	"code.gitea.io/gitea/modules/typesniffer"
    17  	"code.gitea.io/gitea/modules/util"
    18  	"code.gitea.io/gitea/services/context"
    19  )
    20  
    21  // RenderFile renders a file by repos path
    22  func RenderFile(ctx *context.Context) {
    23  	blob, err := ctx.Repo.Commit.GetBlobByPath(ctx.Repo.TreePath)
    24  	if err != nil {
    25  		if git.IsErrNotExist(err) {
    26  			ctx.NotFound("GetBlobByPath", err)
    27  		} else {
    28  			ctx.ServerError("GetBlobByPath", err)
    29  		}
    30  		return
    31  	}
    32  
    33  	dataRc, err := blob.DataAsync()
    34  	if err != nil {
    35  		ctx.ServerError("DataAsync", err)
    36  		return
    37  	}
    38  	defer dataRc.Close()
    39  
    40  	buf := make([]byte, 1024)
    41  	n, _ := util.ReadAtMost(dataRc, buf)
    42  	buf = buf[:n]
    43  
    44  	st := typesniffer.DetectContentType(buf)
    45  	isTextFile := st.IsText()
    46  
    47  	rd := charset.ToUTF8WithFallbackReader(io.MultiReader(bytes.NewReader(buf), dataRc), charset.ConvertOpts{})
    48  	ctx.Resp.Header().Add("Content-Security-Policy", "frame-src 'self'; sandbox allow-scripts")
    49  
    50  	if markupType := markup.DetectMarkupTypeByFileName(blob.Name()); markupType == "" {
    51  		if isTextFile {
    52  			_, _ = io.Copy(ctx.Resp, rd)
    53  		} else {
    54  			http.Error(ctx.Resp, "Unsupported file type render", http.StatusInternalServerError)
    55  		}
    56  		return
    57  	}
    58  
    59  	err = markup.Render(&markup.RenderContext{
    60  		Ctx:          ctx,
    61  		RelativePath: ctx.Repo.TreePath,
    62  		Links: markup.Links{
    63  			Base:       ctx.Repo.RepoLink,
    64  			BranchPath: ctx.Repo.BranchNameSubURL(),
    65  			TreePath:   path.Dir(ctx.Repo.TreePath),
    66  		},
    67  		Metas:            ctx.Repo.Repository.ComposeDocumentMetas(ctx),
    68  		GitRepo:          ctx.Repo.GitRepo,
    69  		InStandalonePage: true,
    70  	}, rd, ctx.Resp)
    71  	if err != nil {
    72  		log.Error("Failed to render file %q: %v", ctx.Repo.TreePath, err)
    73  		http.Error(ctx.Resp, "Failed to render file", http.StatusInternalServerError)
    74  		return
    75  	}
    76  }