// SPDX-License-Identifier: AGPL-3.0-only
// SPDX-FileCopyrightText: Copyright (c) 2025 Runxi Yu <https://runxiyu.org>
package main
import (
"bytes"
"errors"
"fmt"
"html/template"
"io"
"net"
"net/http"
"path"
"strings"
"time"
"github.com/alecthomas/chroma/v2"
chromaHTML "github.com/alecthomas/chroma/v2/formatters/html"
chromaLexers "github.com/alecthomas/chroma/v2/lexers"
chromaStyles "github.com/alecthomas/chroma/v2/styles"
"github.com/go-git/go-git/v5"
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-git/go-git/v5/plumbing/object"
"git.sr.ht/~sircmpwn/go-bare"
)
// httpHandleRepoTree provides a friendly, syntax-highlighted view of
// individual files, and provides directory views that link to these files.
//
// TODO: Do not highlight files that are too large.
func httpHandleRepoTree(writer http.ResponseWriter, request *http.Request, params map[string]any) {
var rawPathSpec, pathSpec string
var repo *git.Repository
var refHash plumbing.Hash
var refHashSlice []byte
var commitObject *object.Commit
var tree *object.Tree
var err error
rawPathSpec = params["rest"].(string)
repo, pathSpec = params["repo"].(*git.Repository), strings.TrimSuffix(rawPathSpec, "/")
repoName := params["repo_name"].(string)
groupPath := params["group_path"].([]string)
rawPathSpec := params["rest"].(string)
pathSpec := strings.TrimSuffix(rawPathSpec, "/")
params["path_spec"] = pathSpec
if refHash, err = getRefHash(repo, params["ref_type"].(string), params["ref_name"].(string)); err != nil {
errorPage500(writer, params, "Error getting ref hash: "+err.Error())
_, repoPath, _, _, _, _, _ := getRepoInfo(request.Context(), groupPath, repoName, "")
conn, err := net.Dial("unix", config.Git.Socket)
if err != nil {
errorPage500(writer, params, "git2d connection failed: "+err.Error())
return
}
refHashSlice = refHash[:]
defer conn.Close()
cacheHandle := append(refHashSlice, stringToBytes(pathSpec)...) //nolint:gocritic
brWriter := bare.NewWriter(conn)
brReader := bare.NewReader(conn)
if value, found := treeReadmeCache.Get(cacheHandle); found {
params["files"] = value.DisplayTree
params["readme_filename"] = value.ReadmeFilename
params["readme"] = value.ReadmeRendered
renderTemplate(writer, "repo_tree_dir", params)
if err := brWriter.WriteData([]byte(repoPath)); err != nil {
errorPage500(writer, params, "sending repo path failed: "+err.Error())
return
}
if value, found := commitPathFileHTMLCache.Get(cacheHandle); found {
params["file_contents"] = value
renderTemplate(writer, "repo_tree_file", params)
if err := brWriter.WriteUint(2); err != nil {
errorPage500(writer, params, "sending command failed: "+err.Error())
return
}
start := time.Now()
var target *object.Tree
if pathSpec == "" {
if commitObject, err = repo.CommitObject(refHash); err != nil {
errorPage500(writer, params, "Error getting commit object: "+err.Error())
return
}
if tree, err = commitObject.Tree(); err != nil {
errorPage500(writer, params, "Error getting file tree: "+err.Error())
return
}
displayTree := makeDisplayTree(tree)
readmeFilename, readmeRendered := renderReadmeAtTree(tree)
cost := time.Since(start).Nanoseconds()
params["files"] = displayTree
params["readme_filename"] = readmeFilename
params["readme"] = readmeRendered
entry := treeReadmeCacheEntry{
DisplayTree: displayTree,
ReadmeFilename: readmeFilename,
ReadmeRendered: readmeRendered,
}
treeReadmeCache.Set(cacheHandle, entry, cost)
renderTemplate(writer, "repo_tree_dir", params)
if err := brWriter.WriteData([]byte(pathSpec)); err != nil {
errorPage500(writer, params, "sending path failed: "+err.Error())
return
}
if commitObject, err = repo.CommitObject(refHash); err != nil {
errorPage500(writer, params, "Error getting commit object: "+err.Error())
return
}
if tree, err = commitObject.Tree(); err != nil {
errorPage500(writer, params, "Error getting file tree: "+err.Error())
status, err := brReader.ReadUint()
if err != nil {
errorPage500(writer, params, "reading status failed: "+err.Error())
return
}
if target, err = tree.Tree(pathSpec); err != nil {
var file *object.File
var fileContent string
var lexer chroma.Lexer
var iterator chroma.Iterator
var style *chroma.Style
var formatter *chromaHTML.Formatter
var formattedHTML template.HTML
if file, err = tree.File(pathSpec); err != nil {
errorPage500(writer, params, "Error retrieving path: "+err.Error())
return
}
if redirectNoDir(writer, request) {
return
}
if fileContent, err = file.Contents(); err != nil {
errorPage500(writer, params, "Error reading file: "+err.Error())
switch status {
case 0:
kind, err := brReader.ReadUint()
if err != nil {
errorPage500(writer, params, "reading object kind failed: "+err.Error())
return
}
lexer = chromaLexers.Match(pathSpec)
if lexer == nil {
lexer = chromaLexers.Fallback
}
if iterator, err = lexer.Tokenise(nil, fileContent); err != nil {
errorPage500(writer, params, "Error tokenizing code: "+err.Error())
return
}
var formattedHTMLStr bytes.Buffer
style = chromaStyles.Get("autumn")
formatter = chromaHTML.New(chromaHTML.WithClasses(true), chromaHTML.TabWidth(8))
if err = formatter.Format(&formattedHTMLStr, style, iterator); err != nil {
errorPage500(writer, params, "Error formatting code: "+err.Error())
return
}
formattedHTML = template.HTML(formattedHTMLStr.Bytes()) //#nosec G203
cost := time.Since(start).Nanoseconds()
commitPathFileHTMLCache.Set(cacheHandle, formattedHTML, cost)
switch kind {
case 1:
// Tree
count, err := brReader.ReadUint()
if err != nil {
errorPage500(writer, params, "reading entry count failed: "+err.Error())
return
}
files := make([]displayTreeEntry, 0, count)
for i := uint64(0); i < count; i++ {
typeCode, err := brReader.ReadUint()
if err != nil {
errorPage500(writer, params, "error reading entry type: "+err.Error())
return
}
mode, err := brReader.ReadUint()
if err != nil {
errorPage500(writer, params, "error reading entry mode: "+err.Error())
return
}
size, err := brReader.ReadUint()
if err != nil {
errorPage500(writer, params, "error reading entry size: "+err.Error())
return
}
name, err := brReader.ReadData()
if err != nil {
errorPage500(writer, params, "error reading entry name: "+err.Error())
return
}
params["file_contents"] = formattedHTML
files = append(files, displayTreeEntry{
Name: string(name),
Mode: fmt.Sprintf("%06o", mode),
Size: int64(size),
IsFile: typeCode == 2,
IsSubtree: typeCode == 1,
})
}
params["files"] = files
params["readme_filename"] = "README.md"
params["readme"] = template.HTML("<p>README rendering here is WIP again</p>") // TODO
renderTemplate(writer, "repo_tree_dir", params)
renderTemplate(writer, "repo_tree_file", params)
return
}
case 2:
// Blob
content, err := brReader.ReadData()
if err != nil && !errors.Is(err, io.EOF) {
errorPage500(writer, params, "error reading file content: "+err.Error())
return
}
rendered := renderHighlightedFile(pathSpec, string(content))
params["file_contents"] = rendered
renderTemplate(writer, "repo_tree_file", params)
if len(rawPathSpec) != 0 && rawPathSpec[len(rawPathSpec)-1] != '/' {
http.Redirect(writer, request, path.Base(pathSpec)+"/", http.StatusSeeOther)
default:
errorPage500(writer, params, fmt.Sprintf("unknown kind: %d", kind))
return
}
case 3:
errorPage500(writer, params, fmt.Sprintf("path not found: %s", pathSpec))
return
}
displayTree := makeDisplayTree(target)
readmeFilename, readmeRendered := renderReadmeAtTree(target)
cost := time.Since(start).Nanoseconds()
entry := treeReadmeCacheEntry{
DisplayTree: displayTree,
ReadmeFilename: readmeFilename,
ReadmeRendered: readmeRendered,
default:
errorPage500(writer, params, fmt.Sprintf("unknown status code: %d", status))
}
treeReadmeCache.Set(cacheHandle, entry, cost)
params["readme_filename"], params["readme"] = readmeFilename, readmeRendered
params["files"] = displayTree
renderTemplate(writer, "repo_tree_dir", params)
}