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// Copyright 2024 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package repo
import (
"bytes"
"encoding/base64"
"fmt"
"html/template"
"io"
"net/url"
"path"
"strings"
"code.gitea.io/gitea/models/renderhelper"
"code.gitea.io/gitea/modules/base"
"code.gitea.io/gitea/modules/charset"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/markup"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/util"
"code.gitea.io/gitea/services/context"
)
// locate a README for a tree in one of the supported paths.
//
// entries is passed to reduce calls to ListEntries(), so
// this has precondition:
//
// entries == ctx.Repo.Commit.SubTree(ctx.Repo.TreePath).ListEntries()
//
// FIXME: There has to be a more efficient way of doing this
func findReadmeFileInEntries(ctx *context.Context, parentDir string, entries []*git.TreeEntry, tryWellKnownDirs bool) (string, *git.TreeEntry, error) {
docsEntries := make([]*git.TreeEntry, 3) // (one of docs/, .gitea/ or .github/)
for _, entry := range entries {
if tryWellKnownDirs && entry.IsDir() {
// as a special case for the top-level repo introduction README,
// fall back to subfolders, looking for e.g. docs/README.md, .gitea/README.zh-CN.txt, .github/README.txt, ...
// (note that docsEntries is ignored unless we are at the root)
lowerName := strings.ToLower(entry.Name())
switch lowerName {
case "docs":
if entry.Name() == "docs" || docsEntries[0] == nil {
docsEntries[0] = entry
}
case ".gitea":
if entry.Name() == ".gitea" || docsEntries[1] == nil {
docsEntries[1] = entry
}
case ".github":
if entry.Name() == ".github" || docsEntries[2] == nil {
docsEntries[2] = entry
}
}
}
}
// Create a list of extensions in priority order
// 1. Markdown files - with and without localisation - e.g. README.en-us.md or README.md
// 2. Txt files - e.g. README.txt
// 3. No extension - e.g. README
exts := append(localizedExtensions(".md", ctx.Locale.Language()), ".txt", "") // sorted by priority
extCount := len(exts)
readmeFiles := make([]*git.TreeEntry, extCount+1)
for _, entry := range entries {
if i, ok := util.IsReadmeFileExtension(entry.Name(), exts...); ok {
fullPath := path.Join(parentDir, entry.Name())
if readmeFiles[i] == nil || base.NaturalSortLess(readmeFiles[i].Name(), entry.Blob().Name()) {
if entry.IsLink() {
res, err := git.EntryFollowLinks(ctx.Repo.Commit, fullPath, entry)
if err == nil && (res.TargetEntry.IsExecutable() || res.TargetEntry.IsRegular()) {
readmeFiles[i] = entry
}
} else {
readmeFiles[i] = entry
}
}
}
}
var readmeFile *git.TreeEntry
for _, f := range readmeFiles {
if f != nil {
readmeFile = f
break
}
}
if ctx.Repo.TreePath == "" && readmeFile == nil {
for _, subTreeEntry := range docsEntries {
if subTreeEntry == nil {
continue
}
subTree := subTreeEntry.Tree()
if subTree == nil {
// this should be impossible; if subTreeEntry exists so should this.
continue
}
childEntries, err := subTree.ListEntries()
if err != nil {
return "", nil, err
}
subfolder, readmeFile, err := findReadmeFileInEntries(ctx, parentDir, childEntries, false)
if err != nil && !git.IsErrNotExist(err) {
return "", nil, err
}
if readmeFile != nil {
return path.Join(subTreeEntry.Name(), subfolder), readmeFile, nil
}
}
}
return "", readmeFile, nil
}
// localizedExtensions prepends the provided language code with and without a
// regional identifier to the provided extension.
// Note: the language code will always be lower-cased, if a region is present it must be separated with a `-`
// Note: ext should be prefixed with a `.`
func localizedExtensions(ext, languageCode string) (localizedExts []string) {
if len(languageCode) < 1 {
return []string{ext}
}
lowerLangCode := "." + strings.ToLower(languageCode)
if strings.Contains(lowerLangCode, "-") {
underscoreLangCode := strings.ReplaceAll(lowerLangCode, "-", "_")
indexOfDash := strings.Index(lowerLangCode, "-")
// e.g. [.zh-cn.md, .zh_cn.md, .zh.md, _zh.md, .md]
return []string{lowerLangCode + ext, underscoreLangCode + ext, lowerLangCode[:indexOfDash] + ext, "_" + lowerLangCode[1:indexOfDash] + ext, ext}
}
// e.g. [.en.md, .md]
return []string{lowerLangCode + ext, ext}
}
func prepareToRenderReadmeFile(ctx *context.Context, subfolder string, readmeFile *git.TreeEntry) {
if readmeFile == nil {
return
}
readmeFullPath := path.Join(ctx.Repo.TreePath, subfolder, readmeFile.Name())
readmeTargetEntry := readmeFile
if readmeFile.IsLink() {
if res, err := git.EntryFollowLinks(ctx.Repo.Commit, readmeFullPath, readmeFile); err == nil {
readmeTargetEntry = res.TargetEntry
} else {
readmeTargetEntry = nil // if we cannot resolve the symlink, we cannot render the readme, ignore the error
}
}
if readmeTargetEntry == nil {
return // if no valid README entry found, skip rendering the README
}
ctx.Data["RawFileLink"] = ""
ctx.Data["ReadmeInList"] = path.Join(subfolder, readmeFile.Name()) // the relative path to the readme file to the current tree path
ctx.Data["ReadmeExist"] = true
ctx.Data["FileIsSymlink"] = readmeFile.IsLink()
buf, dataRc, fInfo, err := getFileReader(ctx, ctx.Repo.Repository.ID, readmeTargetEntry.Blob())
if err != nil {
ctx.ServerError("getFileReader", err)
return
}
defer dataRc.Close()
ctx.Data["FileIsText"] = fInfo.st.IsText()
ctx.Data["FileTreePath"] = readmeFullPath
ctx.Data["FileSize"] = fInfo.fileSize
ctx.Data["IsLFSFile"] = fInfo.isLFSFile()
if fInfo.isLFSFile() {
filenameBase64 := base64.RawURLEncoding.EncodeToString([]byte(readmeFile.Name()))
ctx.Data["RawFileLink"] = fmt.Sprintf("%s.git/info/lfs/objects/%s/%s", ctx.Repo.Repository.Link(), url.PathEscape(fInfo.lfsMeta.Oid), url.PathEscape(filenameBase64))
}
if !fInfo.st.IsText() {
return
}
if fInfo.fileSize >= setting.UI.MaxDisplayFileSize {
// Pretend that this is a normal text file to display 'This file is too large to be shown'
ctx.Data["IsFileTooLarge"] = true
return
}
rd := charset.ToUTF8WithFallbackReader(io.MultiReader(bytes.NewReader(buf), dataRc), charset.ConvertOpts{})
if markupType := markup.DetectMarkupTypeByFileName(readmeFile.Name()); markupType != "" {
ctx.Data["IsMarkup"] = true
ctx.Data["MarkupType"] = markupType
rctx := renderhelper.NewRenderContextRepoFile(ctx, ctx.Repo.Repository, renderhelper.RepoFileOptions{
CurrentRefPath: ctx.Repo.RefTypeNameSubURL(),
CurrentTreePath: path.Dir(readmeFullPath),
}).
WithMarkupType(markupType).
WithRelativePath(readmeFullPath)
ctx.Data["EscapeStatus"], ctx.Data["FileContent"], err = markupRender(ctx, rctx, rd)
if err != nil {
log.Error("Render failed for %s in %-v: %v Falling back to rendering source", readmeFile.Name(), ctx.Repo.Repository, err)
delete(ctx.Data, "IsMarkup")
}
}
if ctx.Data["IsMarkup"] != true {
ctx.Data["IsPlainText"] = true
content, err := io.ReadAll(rd)
if err != nil {
log.Error("Read readme content failed: %v", err)
}
contentEscaped := template.HTMLEscapeString(util.UnsafeBytesToString(content))
ctx.Data["EscapeStatus"], ctx.Data["FileContent"] = charset.EscapeControlHTML(template.HTML(contentEscaped), ctx.Locale)
}
if !fInfo.isLFSFile() && ctx.Repo.Repository.CanEnableEditor() {
ctx.Data["CanEditReadmeFile"] = true
}
}
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