// SPDX-License-Identifier: AGPL-3.0-only
// SPDX-FileContributor: Runxi Yu <https://runxiyu.org>

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

	var readme_file *object.File
	var readme_file_contents string
	var err error

	readme_file, err := tree.File("README")
	if err == nil {
		readme_file_contents, err := readme_file.Contents()
		if err != nil {

	if readme_file, err = tree.File("README"); err != nil {
		if readme_file_contents, err = readme_file.Contents(); 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 {

	if readme_file, err = tree.File("README.md"); err != nil {
		if readme_file_contents, err = readme_file.Contents(); 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 {

		if err = markdown_converter.Convert([]byte(readme_file_contents), &readme_rendered_unsafe); 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 {

	if readme_file, err = tree.File("README.org"); err != nil {
		if readme_file_contents, err = readme_file.Contents(); 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))
}

// SPDX-License-Identifier: AGPL-3.0-only
// SPDX-FileContributor: Runxi Yu <https://runxiyu.org>

package main

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

	"github.com/jackc/pgx/v5"
	"go.lindenii.runxiyu.org/lindenii-common/clog"
)

type http_router_t struct{}

func (router *http_router_t) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	clog.Info("Incoming HTTP: " + r.RemoteAddr + " " + r.Method + " " + r.RequestURI)

	segments, _, err := parse_request_uri(r.RequestURI)
	if err != nil {

	var segments []string
	var err error
	var non_empty_last_segments_len int
	var params map[string]any
	var separator_index int

	if segments, _, err = parse_request_uri(r.RequestURI); err != nil {

		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	non_empty_last_segments_len := len(segments)

	non_empty_last_segments_len = len(segments)

	if segments[len(segments)-1] == "" {
		non_empty_last_segments_len--
	}

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

		switch segments[1] {
		case "static":
			static_handler.ServeHTTP(w, r)
			return
		case "source":
			source_handler.ServeHTTP(w, r)
			return
		}
	}

	params := make(map[string]any)

	params["url_segments"] = segments
	params["global"] = global_data
	var _user_id int // 0 for none
	_user_id, params["username"], err = get_user_info_from_request(r)
	if errors.Is(err, http.ErrNoCookie) {
	} else if errors.Is(err, pgx.ErrNoRows) {
	} else if err != nil {
		http.Error(w, "Error getting user info from request: "+err.Error(), http.StatusInternalServerError)
		return
	}

	if _user_id == 0 {
		params["user_id"] = ""
	} else {
		params["user_id"] = strconv.Itoa(_user_id)
	}

	if segments[0] == ":" {
		switch segments[1] {
		case "login":
			handle_login(w, r, params)
			return
		case "users":
			handle_users(w, r, params)
			return
		default:
			http.Error(w, fmt.Sprintf("Unknown system module type: %s", segments[1]), http.StatusNotFound)
			return
		}
	}

	separator_index := -1

	separator_index = -1

	for i, part := range segments {
		if part == ":" {
			separator_index = i
			break
		}
	}

	params["separator_index"] = separator_index

	// TODO
	if separator_index > 1 {
		http.Error(w, "Subgroups haven't been implemented yet", http.StatusNotImplemented)
		return
	}

	var module_type string
	var module_name string
	var group_name string

	switch {
	case non_empty_last_segments_len == 0:
		handle_index(w, r, params)
	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 redirect_with_slash(w, r) {
			return
		}

		module_type := segments[separator_index+1]

		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]
		group_name := segments[0]

		module_type = segments[separator_index+1]
		module_name = segments[separator_index+2]
		group_name = segments[0]

		params["group_name"] = group_name
		switch module_type {
		case "repos":
			params["repo_name"] = module_name

			if non_empty_last_segments_len > separator_index+3 {
				switch segments[separator_index+3] {
				case "info":

					err = handle_repo_info(w, r, params)
					if err != nil {

					if err = handle_repo_info(w, r, params); err != nil {

						http.Error(w, err.Error(), http.StatusInternalServerError)
					}
					return
				case "git-upload-pack":

					err = handle_upload_pack(w, r, params)
					if err != nil {

					if err = handle_upload_pack(w, r, params); err != nil {

						http.Error(w, err.Error(), http.StatusInternalServerError)
					}
					return
				}
			}

			params["ref_type"], params["ref_name"], err = get_param_ref_and_type(r)
			if err != nil {

			if params["ref_type"], params["ref_name"], err = get_param_ref_and_type(r); err != nil {

				if errors.Is(err, err_no_ref_spec) {
					params["ref_type"] = ""
				} else {
					http.Error(w, "Error querying ref type: "+err.Error(), http.StatusInternalServerError)
					return
				}
			}

			// TODO: subgroups

			params["repo"], params["repo_description"], params["repo_id"], err = open_git_repo(r.Context(), group_name, module_name)
			if err != nil {

			if params["repo"], params["repo_description"], params["repo_id"], err = open_git_repo(r.Context(), group_name, module_name); err != nil {

				http.Error(w, "Error opening repo: "+err.Error(), http.StatusInternalServerError)
				return
			}

			if non_empty_last_segments_len == separator_index+3 {
				if redirect_with_slash(w, r) {
					return
				}
				handle_repo_index(w, r, params)
				return
			}

			repo_feature := segments[separator_index+3]
			switch repo_feature {
			case "tree":
				params["rest"] = strings.Join(segments[separator_index+4:], "/")
				if len(segments) < separator_index+5 && redirect_with_slash(w, r) {
					return
				}
				handle_repo_tree(w, r, params)
			case "raw":
				params["rest"] = strings.Join(segments[separator_index+4:], "/")
				if len(segments) < separator_index+5 && redirect_with_slash(w, r) {
					return
				}
				handle_repo_raw(w, r, params)
			case "log":
				if non_empty_last_segments_len > separator_index+4 {
					http.Error(w, "Too many parameters", http.StatusBadRequest)
					return
				}
				if redirect_with_slash(w, r) {
					return
				}
				handle_repo_log(w, r, params)
			case "commit":
				if redirect_without_slash(w, r) {
					return
				}
				params["commit_id"] = segments[separator_index+4]
				handle_repo_commit(w, r, params)
			case "contrib":
				if redirect_with_slash(w, r) {
					return
				}
				switch non_empty_last_segments_len {
				case separator_index + 4:
					handle_repo_contrib_index(w, r, params)
				case separator_index + 5:
					params["mr_id"] = segments[separator_index+4]
					handle_repo_contrib_one(w, r, params)
				default:
					http.Error(w, "Too many parameters", http.StatusBadRequest)
				}
			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)
		}
	}
}

// SPDX-License-Identifier: AGPL-3.0-only
// SPDX-FileContributor: Runxi Yu <https://runxiyu.org>

package main

import "net/http"

// render_template abstracts out the annoyances of reporting template rendering
// errors.
func render_template(w http.ResponseWriter, template_name string, params map[string]any) {

	err := templates.ExecuteTemplate(w, template_name, params)
	if err != nil {

	if err := templates.ExecuteTemplate(w, template_name, params); err != nil {

		http.Error(w, "Error rendering template: "+err.Error(), http.StatusInternalServerError)
	}
}

// SPDX-License-Identifier: AGPL-3.0-only
// SPDX-FileContributor: Runxi Yu <https://runxiyu.org>

package main

import (
	"errors"
	"flag"
	"net"
	"net/http"
	"syscall"

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

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

	if err := load_config(*config_path); err != nil {
		clog.Fatal(1, "Loading configuration: "+err.Error())
	}
	if err := deploy_hooks_to_filesystem(); err != nil {
		clog.Fatal(1, "Deploying hooks to filesystem: "+err.Error())
	}
	if err := load_templates(); err != nil {
		clog.Fatal(1, "Loading templates: "+err.Error())
	}

	// UNIX socket listener for hooks
	var hooks_listener net.Listener
	var err error
	hooks_listener, err = net.Listen("unix", config.Hooks.Socket)
	if errors.Is(err, syscall.EADDRINUSE) {
		clog.Warn("Removing stale socket " + config.Hooks.Socket)

		if err := syscall.Unlink(config.Hooks.Socket); err != nil {

		if err = syscall.Unlink(config.Hooks.Socket); err != nil {

			clog.Fatal(1, "Removing stale socket: "+err.Error())
		}

		hooks_listener, err = net.Listen("unix", config.Hooks.Socket)
		if err != nil {

		if hooks_listener, err = net.Listen("unix", config.Hooks.Socket); err != nil {

			clog.Fatal(1, "Listening hooks: "+err.Error())
		}
	} else if err != nil {
		clog.Fatal(1, "Listening hooks: "+err.Error())
	}
	clog.Info("Listening hooks on unix " + config.Hooks.Socket)
	go func() {

		if err := serve_git_hooks(hooks_listener); err != nil {

		if err = serve_git_hooks(hooks_listener); err != nil {

			clog.Fatal(1, "Serving hooks: "+err.Error())
		}
	}()

	// SSH listener
	ssh_listener, err := net.Listen(config.SSH.Net, config.SSH.Addr)
	if errors.Is(err, syscall.EADDRINUSE) && config.SSH.Net == "unix" {
		clog.Warn("Removing stale socket " + config.SSH.Addr)

		if err := syscall.Unlink(config.SSH.Addr); err != nil {

		if err = syscall.Unlink(config.SSH.Addr); err != nil {

			clog.Fatal(1, "Removing stale socket: "+err.Error())
		}

		ssh_listener, err = net.Listen(config.SSH.Net, config.SSH.Addr)
		if err != nil {

		if ssh_listener, err = net.Listen(config.SSH.Net, config.SSH.Addr); err != nil {

			clog.Fatal(1, "Listening SSH: "+err.Error())
		}
	} else if err != nil {
		clog.Fatal(1, "Listening SSH: "+err.Error())
	}
	clog.Info("Listening SSH on " + config.SSH.Net + " " + config.SSH.Addr)
	go func() {

		if err := serve_ssh(ssh_listener); err != nil {

		if err = serve_ssh(ssh_listener); err != nil {

			clog.Fatal(1, "Serving SSH: "+err.Error())
		}
	}()

	// HTTP listener
	http_listener, err := net.Listen(config.HTTP.Net, config.HTTP.Addr)
	if errors.Is(err, syscall.EADDRINUSE) && config.HTTP.Net == "unix" {
		clog.Warn("Removing stale socket " + config.HTTP.Addr)

		if err := syscall.Unlink(config.HTTP.Addr); err != nil {

		if err = syscall.Unlink(config.HTTP.Addr); err != nil {

			clog.Fatal(1, "Removing stale socket: "+err.Error())
		}

		http_listener, err = net.Listen(config.HTTP.Net, config.HTTP.Addr)
		if err != nil {

		if http_listener, err = net.Listen(config.HTTP.Net, config.HTTP.Addr); err != nil {

			clog.Fatal(1, "Listening HTTP: "+err.Error())
		}
	} else if err != nil {
		clog.Fatal(1, "Listening HTTP: "+err.Error())
	}
	clog.Info("Listening HTTP on " + config.HTTP.Net + " " + config.HTTP.Addr)
	go func() {

		if err := http.Serve(http_listener, &http_router_t{}); err != nil {

		if err = http.Serve(http_listener, &http_router_t{}); err != nil {

			clog.Fatal(1, "Serving HTTP: "+err.Error())
		}
	}()

	select {}
}

// SPDX-License-Identifier: AGPL-3.0-only
// SPDX-FileContributor: Runxi Yu <https://runxiyu.org>

package main

import (
	"embed"
	"html/template"
	"io/fs"
	"net/http"
)

// We embed all source for easy AGPL compliance.
//
//go:embed .gitignore .gitattributes
//go:embed LICENSE README.md
//go:embed *.go go.mod go.sum
//go:embed *.scfg
//go:embed Makefile
//go:embed schema.sql
//go:embed static/* templates/*
//go:embed git_hooks_client/*.c
//go:embed vendor/*
var source_fs embed.FS

var source_handler = http.StripPrefix(
	"/:/source/",
	http.FileServer(http.FS(source_fs)),
)

//go:embed templates/* static/* git_hooks_client/git_hooks_client
var resources_fs embed.FS

var templates *template.Template

func load_templates() (err error) {
	templates, err = template.New("templates").Funcs(template.FuncMap{
		"first_line": first_line,
		"base_name":  base_name,
	}).ParseFS(resources_fs, "templates/*")
	return err
}

var static_handler http.Handler

func init() {

	static_fs, err := fs.Sub(resources_fs, "static")
	if err != nil {

	if static_fs, err := fs.Sub(resources_fs, "static"); err != nil {

		panic(err)
	}
	static_handler = http.StripPrefix("/:/static/", http.FileServer(http.FS(static_fs)))
}

// SPDX-License-Identifier: AGPL-3.0-only
// SPDX-FileContributor: Runxi Yu <https://runxiyu.org>

package main

import (
	"errors"
	"fmt"
	"os"
	"os/exec"

	glider_ssh "github.com/gliderlabs/ssh"
	"github.com/go-git/go-git/v5"
	"go.lindenii.runxiyu.org/lindenii-common/cmap"
)

type pack_to_hook_t struct {
	session       glider_ssh.Session
	repo          *git.Repository
	pubkey        string
	direct_access bool
	repo_path     string
	user_id       int
	repo_id       int
	group_name    string
	repo_name     string
}

var pack_to_hook_by_cookie = cmap.Map[string, pack_to_hook_t]{}

// ssh_handle_receive_pack handles attempts to push to repos.
func ssh_handle_receive_pack(session glider_ssh.Session, pubkey string, repo_identifier string) (err error) {
	group_name, repo_name, repo_id, repo_path, direct_access, contrib_requirements, user_type, user_id, err := get_repo_path_perms_from_ssh_path_pubkey(session.Context(), repo_identifier, pubkey)
	if err != nil {
		return err
	}
	repo, err := git.PlainOpen(repo_path)
	if err != nil {
		return err
	}

	repo_config, err := repo.Config()
	if err != nil {
		return err
	}

	repo_config_core := repo_config.Raw.Section("core")
	if repo_config_core == nil {
		return errors.New("Repository has no core section in config")
	}

	hooksPath := repo_config_core.OptionAll("hooksPath")
	if len(hooksPath) != 1 || hooksPath[0] != config.Hooks.Execs {
		return errors.New("Repository has hooksPath set to an unexpected value")
	}

	if !direct_access {
		switch contrib_requirements {
		case "closed":
			if !direct_access {
				return errors.New("You need direct access to push to this repo.")
			}
		case "registered_user":
			if user_type != "registered" {
				return errors.New("You need to be a registered user to push to this repo.")
			}
		case "ssh_pubkey":
			if pubkey == "" {
				return errors.New("You need to have an SSH public key to push to this repo.")
			}
			if user_type == "" {
				user_id, err = add_user_ssh(session.Context(), pubkey)
				if err != nil {
					return err
				}
				fmt.Fprintln(session.Stderr(), "You are now registered as user ID", user_id)
			}
		case "public":
		default:
			panic("unknown contrib_requirements value " + contrib_requirements)
		}
	}

	cookie, err := random_urlsafe_string(16)
	if err != nil {
		fmt.Fprintln(session.Stderr(), "Error while generating cookie:", err)
	}

	fmt.Println(group_name, repo_name)

	pack_to_hook_by_cookie.Store(cookie, pack_to_hook_t{
		session:       session,
		pubkey:        pubkey,
		direct_access: direct_access,
		repo_path:     repo_path,
		user_id:       user_id,
		repo_id:       repo_id,
		group_name:    group_name,
		repo_name:     repo_name,
		repo:          repo,
	})
	defer pack_to_hook_by_cookie.Delete(cookie)
	// The Delete won't execute until proc.Wait returns unless something
	// horribly wrong such as a panic occurs.

	proc := exec.CommandContext(session.Context(), "git-receive-pack", repo_path)
	proc.Env = append(os.Environ(),
		"LINDENII_FORGE_HOOKS_SOCKET_PATH="+config.Hooks.Socket,
		"LINDENII_FORGE_HOOKS_COOKIE="+cookie,
	)
	proc.Stdin = session
	proc.Stdout = session
	proc.Stderr = session.Stderr()

	err = proc.Start()
	if err != nil {

	if err = proc.Start(); err != nil {

		fmt.Fprintln(session.Stderr(), "Error while starting process:", err)
		return err
	}

	err = proc.Wait()
	if exitError, ok := err.(*exec.ExitError); ok {
		fmt.Fprintln(session.Stderr(), "Process exited with error", exitError.ExitCode())
	} else if err != nil {
		fmt.Fprintln(session.Stderr(), "Error while waiting for process:", err)
	}

	return err
}

// SPDX-License-Identifier: AGPL-3.0-only
// SPDX-FileContributor: Runxi Yu <https://runxiyu.org>

package main

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

	glider_ssh "github.com/gliderlabs/ssh"
)

// ssh_handle_upload_pack handles clones/fetches. It just uses git-upload-pack
// and has no ACL checks.
func ssh_handle_upload_pack(session glider_ssh.Session, pubkey string, repo_identifier string) (err error) {

	_, _, _, repo_path, _, _, _, _, err := get_repo_path_perms_from_ssh_path_pubkey(session.Context(), repo_identifier, pubkey)
	if err != nil {

	var repo_path string
	if _, _, _, repo_path, _, _, _, _, err = get_repo_path_perms_from_ssh_path_pubkey(session.Context(), repo_identifier, pubkey); err != nil {

		return err
	}

	proc := exec.CommandContext(session.Context(), "git-upload-pack", repo_path)
	proc.Env = append(os.Environ(), "LINDENII_FORGE_HOOKS_SOCKET_PATH="+config.Hooks.Socket)
	proc.Stdin = session
	proc.Stdout = session
	proc.Stderr = session.Stderr()

	err = proc.Start()
	if err != nil {

	if err = proc.Start(); err != nil {

		fmt.Fprintln(session.Stderr(), "Error while starting process:", err)
		return err
	}

	err = proc.Wait()
	if exitError, ok := err.(*exec.ExitError); ok {
		fmt.Fprintln(session.Stderr(), "Process exited with error", exitError.ExitCode())
	} else if err != nil {
		fmt.Fprintln(session.Stderr(), "Error while waiting for process:", err)
	}

	return err
}

// SPDX-License-Identifier: AGPL-3.0-only
// SPDX-FileContributor: Runxi Yu <https://runxiyu.org>

package main

import (
	"fmt"
	"net"
	"os"
	"strings"

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

var (
	server_public_key_string      string
	server_public_key_fingerprint string
	server_public_key             go_ssh.PublicKey
)

func serve_ssh(listener net.Listener) error {

	host_key_bytes, err := os.ReadFile(config.SSH.Key)
	if err != nil {

	var host_key_bytes []byte
	var host_key go_ssh.Signer
	var err error
	var server *glider_ssh.Server

	if host_key_bytes, err = os.ReadFile(config.SSH.Key); err != nil {

		return err
	}

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

	if host_key, err = go_ssh.ParsePrivateKey(host_key_bytes); 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{

	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 = strings.TrimSuffix(string(go_ssh.MarshalAuthorizedKey(client_public_key)), "\n")
			}

			clog.Info("Incoming SSH: " + session.RemoteAddr().String() + " " + client_public_key_string + " " + session.RawCommand())
			fmt.Fprintln(session.Stderr(), ansiec.Blue+"Lindenii Forge "+VERSION+", source at "+strings.TrimSuffix(config.HTTP.Root, "/")+"/:/source/"+ansiec.Reset+"\r")

			cmd := session.Command()

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

			switch cmd[0] {
			case "git-upload-pack":
				if len(cmd) > 2 {
					fmt.Fprintln(session.Stderr(), "Too many arguments\r")
					return
				}
				err = ssh_handle_upload_pack(session, client_public_key_string, cmd[1])
			case "git-receive-pack":
				if len(cmd) > 2 {
					fmt.Fprintln(session.Stderr(), "Too many arguments\r")
					return
				}
				err = ssh_handle_receive_pack(session, client_public_key_string, cmd[1])
			default:
				fmt.Fprintln(session.Stderr(), "Unsupported command: "+cmd[0]+"\r")
				return
			}
			if err != nil {
				fmt.Fprintln(session.Stderr(), err.Error())
				return
			}
		},
		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 },
		// It is intentional that we do not check any credentials and accept all connections.
		// This allows all users to connect and clone repositories. However, the public key
		// is passed to handlers, so e.g. the push handler could check the key and reject the
		// push if it needs to.
	}

	server.AddHostKey(host_key)

	err = server.Serve(listener)
	if err != nil {

	if err = server.Serve(listener); err != nil {

		clog.Fatal(1, "Serving SSH: "+err.Error())
	}

	return nil
}

// SPDX-License-Identifier: AGPL-3.0-only
// SPDX-FileContributor: Runxi Yu <https://runxiyu.org>

package main

import (
	"context"
	"errors"
	"fmt"
	"io"
	"net/url"
	"strings"

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

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

func get_repo_path_perms_from_ssh_path_pubkey(ctx context.Context, ssh_path string, ssh_pubkey string) (group_name string, repo_name string, repo_id int, repo_path string, direct_access bool, contrib_requirements string, user_type string, user_id int, err error) {

	segments := strings.Split(strings.TrimPrefix(ssh_path, "/"), "/")

	var segments []string
	var separator_index int
	var module_type, module_name string

	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 "", "", 0, "", false, "", "", 0, err
		}
	}

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

	separator_index := -1

	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 "", "", 0, "", false, "", "", 0, err_ssh_illegal_endpoint
	case len(segments) <= separator_index+2:
		return "", "", 0, "", false, "", "", 0, err_ssh_illegal_endpoint
	}

	group_name = segments[0]

	module_type := segments[separator_index+1]
	module_name := segments[separator_index+2]

	module_type = segments[separator_index+1]
	module_name = segments[separator_index+2]

	repo_name = module_name
	switch module_type {
	case "repos":
		_1, _2, _3, _4, _5, _6, _7 := get_path_perm_by_group_repo_key(ctx, group_name, module_name, ssh_pubkey)
		return group_name, repo_name, _1, _2, _3, _4, _5, _6, _7
	default:
		return "", "", 0, "", false, "", "", 0, err_ssh_illegal_endpoint
	}
}

func wf_error(w io.Writer, format string, args ...any) {
	fmt.Fprintln(w, ansiec.Red+fmt.Sprintf(format, args...)+ansiec.Reset)
}

// SPDX-License-Identifier: AGPL-3.0-only
// SPDX-FileContributor: Runxi Yu <https://runxiyu.org>

package main

import (
	"context"

	"github.com/jackc/pgx/v5"

)

func add_user_ssh(ctx context.Context, pubkey string) (user_id int, err error) {

	tx, err := database.Begin(ctx)
	if err != nil {

	var tx pgx.Tx

	if tx, err = database.Begin(ctx); err != nil {

		return
	}
	defer tx.Rollback(ctx)

	err = tx.QueryRow(ctx, `INSERT INTO users (type) VALUES ('pubkey_only') RETURNING id`).Scan(&user_id)
	if err != nil {

	if err = tx.QueryRow(ctx, `INSERT INTO users (type) VALUES ('pubkey_only') RETURNING id`).Scan(&user_id); err != nil {

		return
	}

	_, err = tx.Exec(ctx, `INSERT INTO ssh_public_keys (key_string, user_id) VALUES ($1, $2)`, pubkey, user_id)
	if err != nil {

	if _, err = tx.Exec(ctx, `INSERT INTO ssh_public_keys (key_string, user_id) VALUES ($1, $2)`, pubkey, user_id); err != nil {

		return
	}

	err = tx.Commit(ctx)
	return
}