package main

var global_data = map[string]any {
	"server_public_key_string": &server_public_key_string,
	"server_public_key_fingerprint": &server_public_key_fingerprint,
}

package main

import (
	"net/http"
)

func handle_group_repos(w http.ResponseWriter, r *http.Request, params map[string]string) {
	data := make(map[string]any)
	data["global"] = global_data
	group_name := params["group_name"]
	data["group_name"] = group_name

	var names []string
	rows, err := database.Query(r.Context(), "SELECT r.name FROM repos r JOIN groups g ON r.group_id = g.id WHERE g.name = $1;", group_name)
	if err != nil {
		_, _ = w.Write([]byte("Error getting groups: " + err.Error()))
		return
	}
	defer rows.Close()

	for rows.Next() {
		var name string
		if err := rows.Scan(&name); err != nil {
			_, _ = w.Write([]byte("Error scanning row: " + err.Error()))
			return
		}
		names = append(names, name)
	}

	if err := rows.Err(); err != nil {
		_, _ = w.Write([]byte("Error iterating over rows: " + err.Error()))
		return
	}

	data["repos"] = names

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

package main

import (
	"net/http"
)

func handle_index(w http.ResponseWriter, r *http.Request) {
	data := make(map[string]any)
	data["global"] = global_data

	rows, err := database.Query(r.Context(), "SELECT name FROM groups")
	if err != nil {
		_, _ = w.Write([]byte("Error querying groups: " + err.Error()))
		return
	}
	defer rows.Close()

	groups := []string{}
	for rows.Next() {
		var groupName string
		if err := rows.Scan(&groupName); err != nil {
			_, _ = w.Write([]byte("Error scanning group name: " + err.Error()))
			return
		}
		groups = append(groups, groupName)
	}

	if err := rows.Err(); err != nil {
		_, _ = w.Write([]byte("Error iterating over rows: " + err.Error()))
		return
	}

	data["groups"] = groups

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

package main

import (
	"net/http"
	"strings"

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

type usable_file_patch struct {
	From   diff.File
	To     diff.File
	Chunks []diff.Chunk
}

func handle_repo_commit(w http.ResponseWriter, r *http.Request, params map[string]string) {
	data := make(map[string]any)
	data["global"] = global_data
	group_name, repo_name, commit_id_specified_string := params["group_name"], params["repo_name"], params["commit_id"]
	data["group_name"], data["repo_name"] = group_name, repo_name
	repo, err := open_git_repo(r.Context(), group_name, repo_name)
	if err != nil {
		_, _ = w.Write([]byte("Error opening repo: " + err.Error()))
		return
	}
	commit_id_specified_string_without_suffix := strings.TrimSuffix(commit_id_specified_string, ".patch")
	commit_id := plumbing.NewHash(commit_id_specified_string_without_suffix)
	commit_object, err := repo.CommitObject(commit_id)
	if err != nil {
		_, _ = w.Write([]byte("Error getting commit object: " + err.Error()))
		return
	}
	if commit_id_specified_string_without_suffix != commit_id_specified_string {
		patch, err := format_patch_from_commit(commit_object)
		if err != nil {
			_, _ = w.Write([]byte("Error formatting patch: " + err.Error()))
			return
		}
		_, _ = w.Write([]byte(patch))
		return
	}
	commit_id_string := commit_object.Hash.String()

	if commit_id_string != commit_id_specified_string {
		http.Redirect(w, r, commit_id_string, http.StatusSeeOther)
		return
	}

	data["commit_object"] = commit_object
	data["commit_id"] = commit_id_string

	parent_commit_hash, patch, err := get_patch_from_commit(commit_object)
	if err != nil {
		_, _ = w.Write([]byte("Error getting patch from commit: " + err.Error()))
		return
	}
	data["parent_commit_hash"] = parent_commit_hash.String()
	data["patch"] = patch

	// TODO: Remove unnecessary context
	// TODO: Prepend "+"/"-"/" " instead of solely distinguishing based on color
	usable_file_patches := make([]usable_file_patch, 0)
	for _, file_patch := range patch.FilePatches() {
		from, to := file_patch.Files()
		if from == nil {
			from = fake_diff_file_null
		}
		if to == nil {
			to = fake_diff_file_null
		}
		usable_file_patch := usable_file_patch{
			Chunks: file_patch.Chunks(),
			From:   from,
			To:     to,
		}
		usable_file_patches = append(usable_file_patches, usable_file_patch)
	}
	data["file_patches"] = usable_file_patches

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

type fake_diff_file struct {
	hash plumbing.Hash
	mode filemode.FileMode
	path string
}

func (f fake_diff_file) Hash() plumbing.Hash {
	return f.hash
}

func (f fake_diff_file) Mode() filemode.FileMode {
	return f.mode
}

func (f fake_diff_file) Path() string {
	return f.path
}

var fake_diff_file_null = fake_diff_file{
	hash: plumbing.NewHash("e69de29bb2d1d6434b8b29ae775ad8c2e48c5391"),
	mode: misc.First_or_panic(filemode.New("100644")),
	path: "",
}

package main

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

func handle_repo_index(w http.ResponseWriter, r *http.Request, params map[string]string) {
	data := make(map[string]any)
	data["global"] = global_data
	group_name, repo_name := params["group_name"], params["repo_name"]
	data["group_name"], data["repo_name"] = group_name, repo_name
	repo, err := open_git_repo(r.Context(), group_name, repo_name)
	if err != nil {
		_, _ = w.Write([]byte("Error opening repo: " + err.Error()))
		return
	}
	head, err := repo.Head()
	if err != nil {
		_, _ = w.Write([]byte("Error getting repo HEAD: " + err.Error()))
		return
	}
	data["ref"] = head.Name().Short()
	head_hash := head.Hash()
	recent_commits, err := get_recent_commits(repo, head_hash, 3)
	if err != nil {
		_, _ = w.Write([]byte("Error getting recent commits: " + err.Error()))
		return
	}
	data["commits"] = recent_commits
	commit_object, err := repo.CommitObject(head_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
	}

	data["readme_filename"], data["readme"] = render_readme_at_tree(tree)
	data["files"] = build_display_git_tree(tree)

	data["clone_url"] = "ssh://" + r.Host + "/" + url.PathEscape(params["group_name"]) + "/:/repos/" + url.PathEscape(params["repo_name"])

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

package main

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

func handle_repo_info(w http.ResponseWriter, r *http.Request, params map[string]string) {
	http.Error(w, "\x1b[1;93mHi! We do not support Git operations over HTTP yet.\x1b[0m\n\x1b[1;93mMeanwhile, please use ssh by simply replacing the scheme with \"ssh://\":\x1b[0m\n\x1b[1;93mssh://"+r.Host+"/"+url.PathEscape(params["group_name"])+"/:/repos/"+url.PathEscape(params["repo_name"])+"\x1b[0m", http.StatusNotImplemented)
}

package main

import (
	"net/http"

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

// TODO: I probably shouldn't include *all* commits here...
func handle_repo_log(w http.ResponseWriter, r *http.Request, params map[string]string) {
	data := make(map[string]any)
	data["global"] = global_data
	group_name, repo_name, ref_name := params["group_name"], params["repo_name"], params["ref"]
	data["group_name"], data["repo_name"], data["ref"] = group_name, repo_name, ref_name
	repo, err := open_git_repo(r.Context(), 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)
	if err != nil {
		_, _ = w.Write([]byte("Error getting repo reference: " + err.Error()))
		return
	}
	ref_hash := ref.Hash()
	commits, err := get_recent_commits(repo, ref_hash, -1)
	if err != nil {
		_, _ = w.Write([]byte("Error getting recent commits: " + err.Error()))
		return
	}
	data["commits"] = commits

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

package main

import (
	"errors"
	"net/http"
	"path"
	"strings"

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

func handle_repo_raw(w http.ResponseWriter, r *http.Request, params map[string]string) {
	data := make(map[string]any)
	data["global"] = global_data
	raw_path_spec := params["rest"]
	group_name, repo_name, path_spec := params["group_name"], params["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(r.Context(), group_name, repo_name)
	if err != nil {
		_, _ = w.Write([]byte("Error opening repo: " + err.Error()))
		return
	}

	ref_hash, err := get_ref_hash_from_type_and_name(repo, ref_type, ref_name)
	if err != nil {
		_, _ = w.Write([]byte("Error getting ref hash: " + err.Error()))
		return
	}

	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/object"
)

func handle_repo_tree(w http.ResponseWriter, r *http.Request, params map[string]string) {
	data := make(map[string]any)
	data["global"] = global_data
	raw_path_spec := params["rest"]
	group_name, repo_name, path_spec := params["group_name"], params["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(r.Context(), group_name, repo_name)
	if err != nil {
		_, _ = w.Write([]byte("Error opening repo: " + err.Error()))
		return
	}
	ref_hash, err := get_ref_hash_from_type_and_name(repo, ref_type, ref_name)
	if err != nil {
		_, _ = w.Write([]byte("Error getting ref hash: " + err.Error()))
		return
	}
	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_filename"], 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 (
	"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
}

package main

import (
	"bytes"
	"html"
	"html/template"
	"strings"

	"github.com/go-git/go-git/v5/plumbing/object"
	"github.com/microcosm-cc/bluemonday"
	"github.com/niklasfasching/go-org/org"
	"github.com/yuin/goldmark"
	"github.com/yuin/goldmark/extension"
)

var markdown_converter = goldmark.New(goldmark.WithExtensions(extension.GFM))

func render_readme_at_tree(tree *object.Tree) (readme_filename string, readme_content template.HTML) {
	var readme_rendered_unsafe bytes.Buffer

	readme_file, err := tree.File("README")
	if err == nil {
		readme_file_contents, err := readme_file.Contents()
		if err != nil {
			return "Error fetching README", string_escape_html("Unable to fetch contents of README: " + err.Error())
		}
		return "README", template.HTML("<pre>" + html.EscapeString(readme_file_contents) + "</pre>")
	}

	readme_file, err = tree.File("README.md")
	if err == nil {
		readme_file_contents, err := readme_file.Contents()
		if err != nil {
			return "Error fetching README", string_escape_html("Unable to fetch contents of README: " + err.Error())
		}
		err = markdown_converter.Convert([]byte(readme_file_contents), &readme_rendered_unsafe)
		if err != nil {
			return "Error fetching README", string_escape_html("Unable to render README: " + err.Error())
		}
		return "README.md", template.HTML(bluemonday.UGCPolicy().SanitizeBytes(readme_rendered_unsafe.Bytes()))
	}

	readme_file, err = tree.File("README.org")
	if err == nil {
		readme_file_contents, err := readme_file.Contents()
		if err != nil {
			return "Error fetching README", string_escape_html("Unable to fetch contents of README: " + err.Error())
		}
		org_html, err := org.New().Parse(strings.NewReader(readme_file_contents), readme_filename).Write(org.NewHTMLWriter())
		if err != nil {
			return "Error fetching README", string_escape_html("Unable to render README: " + err.Error())
		}
		return "README.org", template.HTML(bluemonday.UGCPolicy().Sanitize(org_html))
	}

	return "", ""
}

func string_escape_html(s string) template.HTML {
	return template.HTML(html.EscapeString(s))
}

package main

import (
	"errors"
	"fmt"
	"net/http"
	"strings"
)

type http_router_t struct{}

func (router *http_router_t) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	segments, _, err := parse_request_uri(r.RequestURI)
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	if segments[0] == ":" {
		if len(segments) < 2 {
			http.Error(w, "Blank system endpoint", http.StatusNotFound)
			return
		}

		switch segments[1] {
		case "static":
			static_handler.ServeHTTP(w, r)
		case "source":
			source_handler.ServeHTTP(w, r)
		default:
			http.Error(w, fmt.Sprintf("Unknown system module type: %s", segments[1]), http.StatusNotFound)
		}
		return
	}

	separator_index := -1
	for i, part := range segments {
		if part == ":" {
			separator_index = i
			break
		}
	}
	non_empty_last_segments_len := len(segments)
	dir_mode := false
	if segments[len(segments)-1] == "" {
		non_empty_last_segments_len--
		dir_mode = true
	}

	params := make(map[string]string)
	_ = params
	switch {
	case non_empty_last_segments_len == 0:
		handle_index(w, r)
	case separator_index == -1:
		http.Error(w, "Group indexing hasn't been implemented yet", http.StatusNotImplemented)
	case non_empty_last_segments_len == separator_index+1:
		http.Error(w, "Group root hasn't been implemented yet", http.StatusNotImplemented)
	case non_empty_last_segments_len == separator_index+2:
		if !dir_mode {
			http.Redirect(w, r, r.URL.Path+"/", http.StatusSeeOther)
			return
		}
		module_type := segments[separator_index+1]
		params["group_name"] = segments[0]
		switch module_type {
		case "repos":
			handle_group_repos(w, r, params)
		default:
			http.Error(w, fmt.Sprintf("Unknown module type: %s", module_type), http.StatusNotFound)
		}
	default:
		module_type := segments[separator_index+1]
		module_name := segments[separator_index+2]
		params["group_name"] = segments[0]
		switch module_type {
		case "repos":
			params["repo_name"] = module_name
			// TODO: subgroups
			if non_empty_last_segments_len == separator_index+3 {
				if !dir_mode {
					http.Redirect(w, r, r.URL.Path+"/", http.StatusSeeOther)
					return
				}
				handle_repo_index(w, r, params)
				return
			}
			repo_feature := segments[separator_index+3]
			switch repo_feature {
			case "info":
				handle_repo_info(w, r, params)
			case "tree":
				params["rest"] = strings.Join(segments[separator_index+4:], "/")
				handle_repo_tree(w, r, params)
			case "raw":
				params["rest"] = strings.Join(segments[separator_index+4:], "/")
				handle_repo_raw(w, r, params)
			case "log":
				if non_empty_last_segments_len != separator_index+5 {
					http.Error(w, "Too many parameters", http.StatusBadRequest)
					return
				}
				if dir_mode {
					http.Redirect(w, r, strings.TrimSuffix(r.URL.Path, "/"), http.StatusSeeOther)
					return
				}
				params["ref"] = segments[separator_index+4]
				handle_repo_log(w, r, params)
			case "commit":
				if dir_mode {
					http.Redirect(w, r, strings.TrimSuffix(r.URL.Path, "/"), http.StatusSeeOther)
					return
				}
				params["commit_id"] = segments[separator_index+4]
				handle_repo_commit(w, r, params)
			default:
				http.Error(w, fmt.Sprintf("Unknown repo feature: %s", repo_feature), http.StatusNotFound)
			}
		default:
			http.Error(w, fmt.Sprintf("Unknown module type: %s", module_type), http.StatusNotFound)
		}
	}
}

var err_bad_request = errors.New("Bad Request")

package main

import (
	"context"
	"errors"
	"net/url"
	"strings"
)

var err_ssh_illegal_endpoint = errors.New("Illegal endpoint during SSH access")

func get_repo_path_from_ssh_path(ctx context.Context, ssh_path string) (repo_path string, err error) {
	segments := strings.Split(strings.TrimPrefix(ssh_path, "/"), "/")

	for i, segment := range segments {
		var err error
		segments[i], err = url.PathUnescape(segment)
		if err != nil {
			return "", err
		}
	}

	if segments[0] == ":" {
		return "", err_ssh_illegal_endpoint
	}

	separator_index := -1
	for i, part := range segments {
		if part == ":" {
			separator_index = i
			break
		}
	}
	if segments[len(segments)-1] == "" {
		segments = segments[:len(segments)-1]
	}

	switch {
	case separator_index == -1:
		return "", err_ssh_illegal_endpoint
	case len(segments) <= separator_index+2:
		return "", err_ssh_illegal_endpoint
	}

	group_name := segments[0]
	module_type := segments[separator_index+1]
	module_name := segments[separator_index+2]
	switch module_type {
	case "repos":
		var fs_path string
		err := database.QueryRow(ctx, "SELECT r.filesystem_path FROM repos r JOIN groups g ON r.group_id = g.id WHERE g.name = $1 AND r.name = $2;", group_name, module_name).Scan(&fs_path)
		return fs_path, err
	default:
		return "", err_ssh_illegal_endpoint
	}
}

package main

import (
	"fmt"
	"net"
	"os"
	"os/exec"

	glider_ssh "github.com/gliderlabs/ssh"
	"go.lindenii.runxiyu.org/lindenii-common/clog"
	go_ssh "golang.org/x/crypto/ssh"
)

var server_public_key_string string
var server_public_key_fingerprint string
var server_public_key go_ssh.PublicKey

func serve_ssh() error {
	host_key_bytes, err := os.ReadFile(config.SSH.Key)
	if err != nil {
		return err
	}

	host_key, err := go_ssh.ParsePrivateKey(host_key_bytes)
	if err != nil {
		return err
	}

	server_public_key = host_key.PublicKey()
	server_public_key_string = string(go_ssh.MarshalAuthorizedKey(server_public_key))
	server_public_key_fingerprint = string(go_ssh.FingerprintSHA256(server_public_key))

	server := &glider_ssh.Server{
		Handler: func(session glider_ssh.Session) {
			client_public_key := session.PublicKey()
			var client_public_key_string string
			if client_public_key != nil {
				client_public_key_string = string(go_ssh.MarshalAuthorizedKey(client_public_key))
			}
			_ = client_public_key_string

			cmd := session.Command()

			if len(cmd) < 2 {
				fmt.Fprintln(session.Stderr(), "Insufficient arguments")
				return
			}

			if cmd[0] != "git-upload-pack" {
				fmt.Fprintln(session.Stderr(), "Unsupported command")
				return
			}

			fs_path, err := get_repo_path_from_ssh_path(session.Context(), cmd[1])
			if err != nil {
				fmt.Fprintln(session.Stderr(), "Error while getting repo path:", err)
				return
			}

			proc := exec.CommandContext(session.Context(), cmd[0], fs_path)
			proc.Stdin = session
			proc.Stdout = session
			proc.Stderr = session.Stderr()

			err = proc.Start()
			if err != nil {
				fmt.Fprintln(session.Stderr(), "Error while starting process:", err)
				return
			}
			err = proc.Wait()
			if exit_error, ok := err.(*exec.ExitError); ok {
				fmt.Fprintln(session.Stderr(), "Process exited with error", exit_error.ExitCode())
			} else if err != nil {
				fmt.Fprintln(session.Stderr(), "Error while waiting for process:", err)
			}
		},
		PublicKeyHandler:           func(ctx glider_ssh.Context, key glider_ssh.PublicKey) bool { return true },
		KeyboardInteractiveHandler: func(ctx glider_ssh.Context, challenge go_ssh.KeyboardInteractiveChallenge) bool { return true },
	}

	server.AddHostKey(host_key)

	listener, err := net.Listen(config.SSH.Net, config.SSH.Addr)
	if err != nil {
		return err
	}

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

	return nil
}

package main

import (
	"path"
	"strings"
)

func first_line(s string) string {
	before, _, _ := strings.Cut(s, "\n")
	return before
}

func base_name(s string) string {
	return path.Base(s)
}

package main

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

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

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
}

func parse_request_uri(request_uri string) (segments []string, params url.Values, err error) {
	path, params_string, _ := strings.Cut(request_uri, "?")

	segments = strings.Split(strings.TrimPrefix(path, "/"), "/")

	for i, segment := range segments {
		segments[i], err = url.PathUnescape(segment)
		if err != nil {
			return nil, nil, misc.Wrap_one_error(err_bad_request, err)
		}
	}

	params, err = url.ParseQuery(params_string)
	if err != nil {
		return nil, nil, misc.Wrap_one_error(err_bad_request, err)
	}

	return
}