package main

import (

	"errors"

	"net/http"
	"path"
	"strings"

	"github.com/go-git/go-git/v5/plumbing"

	"github.com/go-git/go-git/v5/plumbing/object"
)

func handle_repo_raw(w http.ResponseWriter, r *http.Request) {
	data := make(map[string]any)
	// TODO: Sanitize path values
	raw_path_spec := r.PathValue("rest")

	ref_name, group_name, repo_name, path_spec := r.PathValue("ref"), r.PathValue("group_name"), r.PathValue("repo_name"), strings.TrimSuffix(raw_path_spec, "/")
	data["ref"], data["group_name"], data["repo_name"], data["path_spec"] = ref_name, group_name, repo_name, path_spec

	group_name, repo_name, path_spec := r.PathValue("group_name"), r.PathValue("repo_name"), strings.TrimSuffix(raw_path_spec, "/")

	ref_type, ref_name, err := get_param_ref_and_type(r)
	if err != nil {
		if errors.Is(err, err_no_ref_spec) {
			ref_type = "head"
		} else {
			_, _ = w.Write([]byte("Error querying ref type: " + err.Error()))
			return
		}
	}

	data["ref_type"], data["ref"], data["group_name"], data["repo_name"], data["path_spec"] = ref_type, ref_name, group_name, repo_name, path_spec

	repo, err := open_git_repo(group_name, repo_name)
	if err != nil {
		_, _ = w.Write([]byte("Error opening repo: " + err.Error()))
		return
	}

	ref, err := repo.Reference(plumbing.NewBranchReferenceName(ref_name), true)

	ref_hash, err := get_ref_hash_from_type_and_name(repo, ref_type, ref_name)

	if err != nil {

		_, _ = w.Write([]byte("Error getting repo reference: " + err.Error()))

		_, _ = w.Write([]byte("Error getting ref hash: " + err.Error()))

		return
	}

	ref_hash := ref.Hash()

	commit_object, err := repo.CommitObject(ref_hash)
	if err != nil {
		_, _ = w.Write([]byte("Error getting commit object: " + err.Error()))
		return
	}
	tree, err := commit_object.Tree()
	if err != nil {
		_, _ = w.Write([]byte("Error getting file tree: " + err.Error()))
		return
	}

	var target *object.Tree
	if path_spec == "" {
		target = tree
	} else {
		target, err = tree.Tree(path_spec)
		if err != nil {
			file, err := tree.File(path_spec)
			if err != nil {
				_, _ = w.Write([]byte("Error retrieving path: " + err.Error()))
				return
			}
			if len(raw_path_spec) != 0 && raw_path_spec[len(raw_path_spec)-1] == '/' {
				http.Redirect(w, r, "../"+path_spec, http.StatusSeeOther)
				return
			}
			file_contents, err := file.Contents()
			if err != nil {
				_, _ = w.Write([]byte("Error reading file: " + err.Error()))
				return
			}
			_, _ = w.Write([]byte(file_contents))
			return
		}
	}

	if len(raw_path_spec) != 0 && raw_path_spec[len(raw_path_spec)-1] != '/' {
		http.Redirect(w, r, path.Base(path_spec)+"/", http.StatusSeeOther)
		return
	}

	data["files"] = build_display_git_tree(target)

	err = templates.ExecuteTemplate(w, "repo_raw_dir", data)
	if err != nil {
		_, _ = w.Write([]byte("Error rendering template: " + err.Error()))
		return
	}
}

package main

import (
	"bytes"

	"errors"

	"html/template"
	"net/http"
	"path"
	"strings"

	chroma_formatters_html "github.com/alecthomas/chroma/v2/formatters/html"
	chroma_lexers "github.com/alecthomas/chroma/v2/lexers"
	chroma_styles "github.com/alecthomas/chroma/v2/styles"

	"github.com/go-git/go-git/v5/plumbing"

	"github.com/go-git/go-git/v5/plumbing/object"
)

func handle_repo_tree(w http.ResponseWriter, r *http.Request) {
	data := make(map[string]any)
	// TODO: Sanitize path values
	raw_path_spec := r.PathValue("rest")

	ref_name, group_name, repo_name, path_spec := r.PathValue("ref"), r.PathValue("group_name"), r.PathValue("repo_name"), strings.TrimSuffix(raw_path_spec, "/")
	data["ref"], data["group_name"], data["repo_name"], data["path_spec"] = ref_name, group_name, repo_name, path_spec

	group_name, repo_name, path_spec := r.PathValue("group_name"), r.PathValue("repo_name"), strings.TrimSuffix(raw_path_spec, "/")
	ref_type, ref_name, err := get_param_ref_and_type(r)
	if err != nil {
		if errors.Is(err, err_no_ref_spec) {
			ref_type = "head"
		} else {
			_, _ = w.Write([]byte("Error querying ref type: " + err.Error()))
			return
		}
	}
	data["ref_type"], data["ref"], data["group_name"], data["repo_name"], data["path_spec"] = ref_type, ref_name, group_name, repo_name, path_spec

	repo, err := open_git_repo(group_name, repo_name)
	if err != nil {
		_, _ = w.Write([]byte("Error opening repo: " + err.Error()))
		return
	}

	ref, err := repo.Reference(plumbing.NewBranchReferenceName(ref_name), true)

	ref_hash, err := get_ref_hash_from_type_and_name(repo, ref_type, ref_name)

	if err != nil {

		_, _ = w.Write([]byte("Error getting repo reference: " + err.Error()))

		_, _ = w.Write([]byte("Error getting ref hash: " + err.Error()))

		return
	}

	ref_hash := ref.Hash()

	commit_object, err := repo.CommitObject(ref_hash)
	if err != nil {
		_, _ = w.Write([]byte("Error getting commit object: " + err.Error()))
		return
	}
	tree, err := commit_object.Tree()
	if err != nil {
		_, _ = w.Write([]byte("Error getting file tree: " + err.Error()))
		return
	}

	var target *object.Tree
	if path_spec == "" {
		target = tree
	} else {
		target, err = tree.Tree(path_spec)
		if err != nil {
			file, err := tree.File(path_spec)
			if err != nil {
				_, _ = w.Write([]byte("Error retrieving path: " + err.Error()))
				return
			}
			if len(raw_path_spec) != 0 && raw_path_spec[len(raw_path_spec)-1] == '/' {
				http.Redirect(w, r, "../"+path_spec, http.StatusSeeOther)
				return
			}
			file_contents, err := file.Contents()
			if err != nil {
				_, _ = w.Write([]byte("Error reading file: " + err.Error()))
				return
			}
			lexer := chroma_lexers.Match(path_spec)
			if lexer == nil {
				lexer = chroma_lexers.Fallback
			}
			iterator, err := lexer.Tokenise(nil, file_contents)
			if err != nil {
				_, _ = w.Write([]byte("Error tokenizing code: " + err.Error()))
				return
			}
			var formatted_unencapsulated bytes.Buffer
			style := chroma_styles.Get("autumn")
			formatter := chroma_formatters_html.New(chroma_formatters_html.WithClasses(true), chroma_formatters_html.TabWidth(8))
			err = formatter.Format(&formatted_unencapsulated, style, iterator)
			if err != nil {
				_, _ = w.Write([]byte("Error formatting code: " + err.Error()))
				return
			}
			formatted_encapsulated := template.HTML(formatted_unencapsulated.Bytes())
			data["file_contents"] = formatted_encapsulated

			err = templates.ExecuteTemplate(w, "repo_tree_file", data)
			if err != nil {
				_, _ = w.Write([]byte("Error rendering template: " + err.Error()))
				return
			}
			return
		}
	}

	if len(raw_path_spec) != 0 && raw_path_spec[len(raw_path_spec)-1] != '/' {
		http.Redirect(w, r, path.Base(path_spec)+"/", http.StatusSeeOther)
		return
	}

	data["readme"] = render_readme_at_tree(target)
	data["files"] = build_display_git_tree(target)

	err = templates.ExecuteTemplate(w, "repo_tree_dir", data)
	if err != nil {
		_, _ = w.Write([]byte("Error rendering template: " + err.Error()))
		return
	}
}

package main

import (
	"flag"
	"net"
	"net/http"

	"go.lindenii.runxiyu.org/lindenii-common/clog"
)

func main() {
	config_path := flag.String(
		"config",
		"/etc/lindenii/forge.scfg",
		"path to configuration file",
	)
	flag.Parse()

	err := load_config(*config_path)
	if err != nil {
		clog.Fatal(1, "Loading configuration: "+err.Error())
	}

	err = load_templates()
	if err != nil {
		clog.Fatal(1, "Loading templates: "+err.Error())
	}

	err = serve_static()
	if err != nil {
		clog.Fatal(1, "Serving static: "+err.Error())
	}

	serve_source()

	http.HandleFunc("/{$}", handle_index)
	http.HandleFunc("/g/{group_name}/repos/{$}", handle_group_repos)
	http.HandleFunc("/g/{group_name}/repos/{repo_name}/{$}", handle_repo_index)

	http.HandleFunc("/g/{group_name}/repos/{repo_name}/tree/{ref}/{rest...}", handle_repo_tree)
	http.HandleFunc("/g/{group_name}/repos/{repo_name}/raw/{ref}/{rest...}", handle_repo_raw)

	http.HandleFunc("/g/{group_name}/repos/{repo_name}/tree/{rest...}", handle_repo_tree)
	http.HandleFunc("/g/{group_name}/repos/{repo_name}/raw/{rest...}", handle_repo_raw)

	http.HandleFunc("/g/{group_name}/repos/{repo_name}/log/{ref}/", handle_repo_log)
	http.HandleFunc("/g/{group_name}/repos/{repo_name}/commit/{commit_id}", handle_repo_commit)

	listener, err := net.Listen(config.HTTP.Net, config.HTTP.Addr)
	if err != nil {
		clog.Fatal(1, "Listening: "+err.Error())
	}

	err = http.Serve(listener, nil)
	if err != nil {
		clog.Fatal(1, "Serving: "+err.Error())
	}
}

package main

import (
	"errors"

	"github.com/go-git/go-git/v5"
	"github.com/go-git/go-git/v5/plumbing"
	"go.lindenii.runxiyu.org/lindenii-common/misc"
)

var (
	err_getting_tag_reference = errors.New("Error getting tag reference")
	err_getting_branch_reference = errors.New("Error getting branch reference")
	err_getting_head = errors.New("Error getting HEAD")
)

func get_ref_hash_from_type_and_name(repo *git.Repository, ref_type, ref_name string) (ref_hash plumbing.Hash, ret_err error) {
	switch ref_type {
	case "head":
		head, err := repo.Head()
		if err != nil {
			ret_err = misc.Wrap_one_error(err_getting_head, err)
			return
		}
		ref_hash = head.Hash()
	case "commit":
		ref_hash = plumbing.NewHash(ref_name)
	case "branch":
		ref, err := repo.Reference(plumbing.NewBranchReferenceName(ref_name), true)
		if err != nil {
			ret_err = misc.Wrap_one_error(err_getting_branch_reference, err)
			return
		}
		ref_hash = ref.Hash()
	case "tag":
		ref, err := repo.Reference(plumbing.NewTagReferenceName(ref_name), true)
		if err != nil {
			ret_err = misc.Wrap_one_error(err_getting_tag_reference, err)
			return
		}
		ref_hash = ref.Hash()
	default:
		panic("Invalid ref type " + ref_type)
	}
	return
}

{{- define "repo_commit" -}}
<!DOCTYPE html>
<html lang="en">
	<head>
		{{ template "head_common" . }}
		<title>{{ .group_name }}/repos/{{ .repo_name }} &ndash; Lindenii Forge</title>
	</head>
	<body class="repo-commit">
		<div class="padding-wrapper scroll">
			<table id="commit-info-table">
				<thead>
					<tr class="title-row">
						<th colspan="2">Commit Info</th>
					</tr>
				</thead>
				<tbody>
					<tr>
						<th scope="row">ID</th>
						<td>{{ .commit_id }}</td>
					</tr>
					<tr>
						<th scope="row">Author</th>
						<td>{{ .commit_object.Author.Name }} &lt;<a href="mailto:{{ .commit_object.Author.Email }}">{{ .commit_object.Author.Email }}</a>&gt;</td>
					</tr>
					<tr>
						<th scope="row">Author Date</th>
						<td>{{ .commit_object.Author.When.Format "Mon, 02 Jan 2006 15:04:05 -0700" }}</td>
					</tr>
					<tr>
						<th scope="row">Committer</th>
						<td>{{ .commit_object.Committer.Name }} &lt;<a href="mailto:{{ .commit_object.Committer.Email }}">{{ .commit_object.Committer.Email }}</a>&gt;</td>
					</tr>
					<tr>
						<th scope="row">Committer Date</th>
						<td>{{ .commit_object.Committer.When.Format "Mon, 02 Jan 2006 15:04:05 -0700" }}</td>
					</tr>
					<tr>
						<th scope="row">Message</th>
						<td><pre>{{ .commit_object.Message }}</pre></td>
					</tr>
					<tr>
						<th scope="row">Actions</th>
						<td><pre><a href="{{ .commit_object.Hash }}.patch">Get as Patch</a></pre></td>
					</tr>
				</tbody>
			</table>
		</div>
		<div class="padding-wrapper">
			{{ $parent_commit_object := .parent_commit_object }}
			{{ $commit_object := .commit_object }}
			{{ range .file_patches }}
				<div class="file-patch toggle-on-wrapper">
					<input type="checkbox" id="toggle-{{ .From.Hash }}{{ .To.Hash }}" class="file-toggle toggle-on-toggle">
					<label for="toggle-{{ .From.Hash }}{{ .To.Hash }}" class="file-header toggle-on-header">
						<span>

							--- a/<a href="../../tree/{{ .From.Path }}?commit={{ $parent_commit_object.Hash }}">{{ .From.Path }}</a> {{ .From.Mode }}

							--- a/<a href="../tree/{{ .From.Path }}?commit={{ $parent_commit_object.Hash }}">{{ .From.Path }}</a> {{ .From.Mode }}

							<br />

							+++ b/<a href="../../tree/{{ .To.Path }}?commit={{ $commit_object.Hash }}">{{ .To.Path }}</a> {{ .To.Mode }}

							+++ b/<a href="../tree/{{ .To.Path }}?commit={{ $commit_object.Hash }}">{{ .To.Path }}</a> {{ .To.Mode }}

						</span>
					</label>
					<div class="file-content toggle-on-content scroll">
						{{ range .Chunks }}
							{{ if eq .Type 0 }}
								<pre class="chunk chunk-unchanged">{{ .Content }}</pre>
							{{ else if eq .Type 1 }}
								<pre class="chunk chunk-addition">{{ .Content }}</pre>
							{{ else if eq .Type 2 }}
								<pre class="chunk chunk-deletion">{{ .Content }}</pre>
							{{ else }}
								<pre class="chunk chunk-unknown">{{ .Content }}</pre>
							{{ end }}
						{{ end }}
					</div>
				</div>
			{{ end }}
		</div>
		<footer>
			{{ template "footer" . }}
		</footer>
	</body>
</html>
{{- end -}}

{{- define "repo_index" -}}
<!DOCTYPE html>
<html lang="en">
	<head>
		{{ template "head_common" . }}
		<title>{{ .group_name }}/repos/{{ .repo_name }} &ndash; Lindenii Forge</title>
	</head>
	<body class="repo-index">
		<div class="padding-wrapper scroll">
			<input id="toggle-table-recent-commits" type="checkbox" class="toggle-table-off" />
			<table id="recent-commits" class="wide">
				<thead>
					<tr class="title-row">
						<th colspan="3"><label for="toggle-table-recent-commits">Recent Commits (<a href="log/{{ .ref }}/">see all</a>)</label></th>
					</tr>
				</thead>
				<tbody>
					{{- range .commits }}
						<tr>
							<td class="commit-title"><a href="commit/{{ .ID }}">{{ .Message | first_line }}</a></td>
							<td class="commit-author">
								<a class="email-name" href="mailto:{{ .Author.Email }}">{{ .Author.Name }}</a>
							</td>
							<td class="commit-time">
								{{ .Author.When.Format "2006-01-02 15:04:05 -0700" }}
							</td>
						</tr>
					{{- end }}
				</tbody>
			</table>
		</div>
		<div class="padding-wrapper scroll">
			<input id="toggle-table-file-tree" type="checkbox" class="toggle-table-off" />
			<table id="file-tree" class="wide">
				<thead>
					<tr class="title-row">
						<th colspan="3"><label for="toggle-table-file-tree">/ on {{ .ref }}</label></th>
					</tr>
				</thead>
				<tbody>
					{{- $ref := .ref }}
					{{- range .files }}
						<tr>
							<td class="file-mode">{{ .Mode }}</td>

							<td class="file-name"><a href="tree/{{ $ref }}/{{ .Name }}">{{ .Name }}</a>{{ if not .Is_file }}/{{ end }}</td>

							<td class="file-name"><a href="tree/{{ .Name }}">{{ .Name }}</a>{{ if not .Is_file }}/{{ end }}</td>

							<td class="file-size">{{ .Size }}</td>
						</tr>
					{{- end }}
				</tbody>
			</table>
		</div>
		<div class="padding-wrapper">
			<div id="refs">
			</div>
		</div>
		<div class="padding-wrapper">
			{{ if .readme }}
				<input id="toggle-table-readme" type="checkbox" class="toggle-table-off" />
				<table class="wide">
					<thead>
						<tr class="title-row">
							<th><label for="toggle-table-readme">README</label></th>
						</tr>
					</thead>
					<tbody>
						<tr>
							<td id="readme">
								{{ .readme -}}
							</td>
						</tr>
					</tbody>
				</table>
			{{ end }}
		</div>
		<footer>
			{{ template "footer" . }}
		</footer>
	</body>
</html>
{{- end -}}

{{- define "repo_tree_file" -}}
<!DOCTYPE html>
<html lang="en">
	<head>
		{{ template "head_common" . }}
		<link rel="stylesheet" href="/static/chroma.css" />
		<title>{{ .group_name }}/repos/{{ .repo_name }}/{{ .path_spec }} &ndash; Lindenii Forge</title>
	</head>
	<body class="repo-tree-file">
		<p>

			/{{ .path_spec }} (<a href="/g/{{ .group_name }}/repos/{{ .repo_name }}/raw/{{ .ref }}/{{ .path_spec }}">raw</a>)

			/{{ .path_spec }} (<a href="/g/{{ .group_name }}/repos/{{ .repo_name }}/raw/{{ .path_spec }}?{{ .ref_type }}={{ .ref }}">raw</a>)

		</p>
		{{ .file_contents }}
		<footer>
			{{ template "footer" . }}
		</footer>
	</body>
</html>
{{- end -}}

package main

import (
	"errors"
	"net/http"
	"net/url"
)

var (
	err_duplicate_ref_spec = errors.New("Duplicate ref spec")
	err_no_ref_spec = errors.New("No ref spec")
)

func get_param_ref_and_type(r *http.Request) (ref_type, ref string, err error) {
	qr := r.URL.RawQuery
	q, err := url.ParseQuery(qr)
	if err != nil {
		return
	}
	done := false
	for _, _ref_type := range []string{"commit", "branch", "tag"} {
		_ref, ok := q[_ref_type]
		if ok {
			if done {
				err = err_duplicate_ref_spec
				return
			} else {
				done = true
				if len(_ref) != 1 {
					err = err_duplicate_ref_spec
					return
				}
				ref = _ref[0]
				ref_type = _ref_type
			}
		}
	}
	if !done {
		err = err_no_ref_spec
	}
	return
}