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

package main

import (
	"context"
)

// get_path_perm_by_group_repo_key returns the filesystem path and direct
// access permission for a given repo and a provided ssh public key.
func get_path_perm_by_group_repo_key(ctx context.Context, group_name, repo_name, ssh_pubkey string) (repo_id int, filesystem_path string, access bool, contrib_requirements string, user_type string, user_id int, err error) {
	err = database.QueryRow(ctx,
		`SELECT 
		r.id,
		r.filesystem_path,
		CASE
			WHEN ugr.user_id IS NOT NULL THEN TRUE
			ELSE FALSE
		END AS has_role_in_group,
		r.contrib_requirements,
		COALESCE(u.type, ''),
		COALESCE(u.id, 0)
		FROM 
			groups g
		JOIN 
			repos r ON r.group_id = g.id
		LEFT JOIN 
			ssh_public_keys s ON s.key_string = $3
		LEFT JOIN 
			users u ON u.id = s.user_id
		LEFT JOIN 
			user_group_roles ugr ON ugr.group_id = g.id AND ugr.user_id = u.id
		WHERE 
			g.name = $1
		AND r.name = $2;`,
		group_name, repo_name, ssh_pubkey,
	).Scan(&repo_id, &filesystem_path, &access, &contrib_requirements, &user_type, &user_id)
	return
}

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

package main

import (
	"bufio"
	"context"
	"errors"
	"os"

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

var database *pgxpool.Pool

var err_unsupported_database_type = errors.New("unsupported database type")

var config struct {
	HTTP struct {
		Net          string `scfg:"net"`
		Addr         string `scfg:"addr"`
		CookieExpiry int    `scfg:"cookie_expiry"`
		Root         string `scfg:"root"`
	} `scfg:"http"`
	Hooks struct {
		Socket string `scfg:"socket"`
		Execs  string `scfg:"execs"`
	} `scfg:"hooks"`
	SSH struct {
		Net  string `scfg:"net"`
		Addr string `scfg:"addr"`
		Key  string `scfg:"key"`
		Root string `scfg:"root"`
	} `scfg:"ssh"`
	General struct {
		Title string `scfg:"title"`
	} `scfg:"general"`
	DB struct {
		Type string `scfg:"type"`
		Conn string `scfg:"conn"`
	} `scfg:"db"`
}

func load_config(path string) (err error) {
	config_file, err := os.Open(path)
	if err != nil {
		return err
	}
	defer config_file.Close()

	decoder := scfg.NewDecoder(bufio.NewReader(config_file))
	err = decoder.Decode(&config)
	if err != nil {
		return err
	}

	if config.DB.Type != "postgres" {
		return err_unsupported_database_type
	}
	database, err = pgxpool.New(context.Background(), config.DB.Conn)
	if err != nil {
		return err
	}

	global_data["forge_title"] = config.General.Title

	return nil
}

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

package main

import (
	"context"
)

// query_list is a helper function that executes a query and returns a list of
// results.
func query_list[T any](ctx context.Context, query string, args ...any) ([]T, error) {
	rows, err := database.Query(ctx, query, args...)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var result []T
	for rows.Next() {
		var item T
		if err := rows.Scan(&item); err != nil {
			return nil, err
		}
		result = append(result, item)
	}

	if err := rows.Err(); err != nil {
		return nil, err
	}

	return result, nil
}

// query_name_desc_list is a helper function that executes a query and returns a
// list of name_desc_t results.
func query_name_desc_list(ctx context.Context, query string, args ...any) ([]name_desc_t, error) {
	rows, err := database.Query(ctx, query, args...)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	result := []name_desc_t{}
	for rows.Next() {
		var name, description string
		if err := rows.Scan(&name, &description); err != nil {
			return nil, err
		}
		result = append(result, name_desc_t{name, description})
	}
	return result, rows.Err()
}

// name_desc_t holds a name and a description.
type name_desc_t struct {
	Name        string
	Description string
}

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

package main

import (
	"bytes"
	"fmt"
	"strings"
	"time"

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

// get_patch_from_commit formats a commit object as if it was returned by
// git-format-patch.
func format_patch_from_commit(commit *object.Commit) (string, error) {
	_, patch, err := get_patch_from_commit(commit)
	if err != nil {
		return "", err
	}

	var buf bytes.Buffer

	author := commit.Author
	date := author.When.Format(time.RFC1123Z)

	commit_msg_title, commit_msg_details, _ := strings.Cut(commit.Message, "\n")

	// This date is hardcoded in Git.
	fmt.Fprintf(&buf, "From %s Mon Sep 17 00:00:00 2001\n", commit.Hash)
	fmt.Fprintf(&buf, "From: %s <%s>\n", author.Name, author.Email)
	fmt.Fprintf(&buf, "Date: %s\n", date)
	fmt.Fprintf(&buf, "Subject: [PATCH] %s\n\n", commit_msg_title)

	if commit_msg_details != "" {
		commit_msg_details_first_line, commit_msg_details_rest, _ := strings.Cut(commit_msg_details, "\n")
		if strings.TrimSpace(commit_msg_details_first_line) == "" {
			commit_msg_details = commit_msg_details_rest
		}
		buf.WriteString(commit_msg_details)
		buf.WriteString("\n")
	}
	buf.WriteString("---\n")
	fmt.Fprint(&buf, patch.Stats().String())
	fmt.Fprintln(&buf)

	buf.WriteString(patch.String())

	fmt.Fprintf(&buf, "\n-- \n2.48.1\n")

	return buf.String(), nil
}

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

package main

import (
	"errors"
	"io"
	"os"
	"path/filepath"
)

// deploy_hooks_to_filesystem deploys the git hooks client to the filesystem.
// The git hooks client is expected to be embedded in resources_fs and must be
// pre-compiled during the build process; see the Makefile.
func deploy_hooks_to_filesystem() (err error) {
	err = func() error {
		src_fd, err := resources_fs.Open("git_hooks_client/git_hooks_client")
		if err != nil {
			return err
		}
		defer src_fd.Close()

		dst_fd, err := os.OpenFile(filepath.Join(config.Hooks.Execs, "git_hooks_client"), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0o755)
		if err != nil {
			return err
		}
		defer dst_fd.Close()

		_, err = io.Copy(dst_fd, src_fd)
		if err != nil {
			return err
		}

		return nil
	}()
	if err != nil {
		return err
	}

	// Go's embed filesystems do not store permissions; but in any case,
	// they would need to be 0o755:
	err = os.Chmod(filepath.Join(config.Hooks.Execs, "git_hooks_client"), 0o755)
	if err != nil {
		return err
	}

	for _, hook_name := range []string{
		"pre-receive",
	} {
		err = os.Symlink(filepath.Join(config.Hooks.Execs, "git_hooks_client"), filepath.Join(config.Hooks.Execs, hook_name))
		if err != nil && !errors.Is(err, os.ErrExist) {
			return err
		}
	}

	return nil
}

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

package main

import (
	"bytes"
	"context"
	"encoding/binary"
	"errors"
	"fmt"
	"io"
	"net"
	"os"
	"path/filepath"
	"strconv"
	"strings"
	"syscall"

	"github.com/go-git/go-git/v5/plumbing"
	"github.com/jackc/pgx/v5"
	"go.lindenii.runxiyu.org/lindenii-common/ansiec"
)

var (
	err_get_fd    = errors.New("unable to get file descriptor")
	err_get_ucred = errors.New("failed getsockopt")
)

// hooks_handle_connection handles a connection from git_hooks_client via the
// unix socket.
func hooks_handle_connection(conn net.Conn) {
	defer conn.Close()
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	// There aren't reasonable cases where someone would run this as
	// another user.
	ucred, err := get_ucred(conn)
	if err != nil {
		if _, err := conn.Write([]byte{1}); err != nil {
			return
		}
		wf_error(conn, "\nUnable to get peer credentials: %v", err)
		return
	}
	if ucred.Uid != uint32(os.Getuid()) {
		if _, err := conn.Write([]byte{1}); err != nil {
			return
		}
		wf_error(conn, "\nUID mismatch")
		return
	}

	cookie := make([]byte, 64)
	_, err = conn.Read(cookie)
	if err != nil {
		if _, err := conn.Write([]byte{1}); err != nil {
			return
		}
		wf_error(conn, "\nFailed to read cookie: %v", err)
		return
	}

	pack_to_hook, ok := pack_to_hook_by_cookie.Load(string(cookie))
	if !ok {
		if _, err := conn.Write([]byte{1}); err != nil {
			return
		}
		wf_error(conn, "\nInvalid handler cookie")
		return
	}

	ssh_stderr := pack_to_hook.session.Stderr()

	ssh_stderr.Write([]byte{'\n'})

	hook_return_value := func() byte {
		var argc64 uint64
		err = binary.Read(conn, binary.NativeEndian, &argc64)
		if err != nil {
			wf_error(ssh_stderr, "Failed to read argc: %v", err)
			return 1
		}
		var args []string
		for i := uint64(0); i < argc64; i++ {
			var arg bytes.Buffer
			for {
				b := make([]byte, 1)
				n, err := conn.Read(b)
				if err != nil || n != 1 {
					wf_error(ssh_stderr, "Failed to read arg: %v", err)
					return 1
				}
				if b[0] == 0 {
					break
				}
				arg.WriteByte(b[0])
			}
			args = append(args, arg.String())
		}

		var stdin bytes.Buffer
		_, err = io.Copy(&stdin, conn)
		if err != nil {
			wf_error(conn, "Failed to read to the stdin buffer: %v", err)
		}

		switch filepath.Base(args[0]) {
		case "pre-receive":
			if pack_to_hook.direct_access {
				return 0
			} else {
				all_ok := true
				for {
					line, err := stdin.ReadString('\n')
					if errors.Is(err, io.EOF) {
						break
					}
					line = line[:len(line)-1]

					old_oid, rest, found := strings.Cut(line, " ")
					if !found {
						wf_error(ssh_stderr, "Invalid pre-receive line: %v", line)
						return 1
					}

					new_oid, ref_name, found := strings.Cut(rest, " ")
					if !found {
						wf_error(ssh_stderr, "Invalid pre-receive line: %v", line)
						return 1
					}

					if strings.HasPrefix(ref_name, "refs/heads/contrib/") {
						if all_zero_num_string(old_oid) { // New branch
							fmt.Fprintln(ssh_stderr, ansiec.Blue+"POK"+ansiec.Reset, ref_name)
							var new_mr_id int
							err = database.QueryRow(ctx,
								"INSERT INTO merge_requests (repo_id, creator, source_ref, status) VALUES ($1, $2, $3, 'open') RETURNING id",
								pack_to_hook.repo_id, pack_to_hook.user_id, strings.TrimPrefix(ref_name, "refs/heads/"),
							).Scan(&new_mr_id)
							if err != nil {
								wf_error(ssh_stderr, "Error creating merge request: %v", err)
								return 1
							}
							fmt.Fprintln(ssh_stderr, ansiec.Blue+"Created merge request at", generate_http_remote_url(pack_to_hook.group_name, pack_to_hook.repo_name)+"/contrib/"+strconv.FormatUint(uint64(new_mr_id), 10)+"/"+ansiec.Reset)
						} else { // Existing contrib branch
							var existing_merge_request_user_id int
							err = database.QueryRow(ctx,
								"SELECT COALESCE(creator, 0) FROM merge_requests WHERE source_ref = $1 AND repo_id = $2",
								strings.TrimPrefix(ref_name, "refs/heads/"), pack_to_hook.repo_id,
							).Scan(&existing_merge_request_user_id)
							if err != nil {
								if errors.Is(err, pgx.ErrNoRows) {
									wf_error(ssh_stderr, "No existing merge request for existing contrib branch: %v", err)
								} else {
									wf_error(ssh_stderr, "Error querying for existing merge request: %v", err)
								}
								return 1
							}
							if existing_merge_request_user_id == 0 {
								all_ok = false
								fmt.Fprintln(ssh_stderr, ansiec.Red+"NAK"+ansiec.Reset, ref_name, "(branch belongs to unowned MR)")
								continue
							}

							if existing_merge_request_user_id != pack_to_hook.user_id {
								all_ok = false
								fmt.Fprintln(ssh_stderr, ansiec.Red+"NAK"+ansiec.Reset, ref_name, "(branch belongs another user's MR)")
								continue
							}

							old_hash := plumbing.NewHash(old_oid)

							old_commit, err := pack_to_hook.repo.CommitObject(old_hash)
							if err != nil {
								wf_error(ssh_stderr, "Daemon failed to get old commit: %v", err)
								return 1
							}

							// Potential BUG: I'm not sure if new_commit is guaranteed to be
							// detectable as they haven't been merged into the main repo's
							// objects yet. But it seems to work, and I don't think there's
							// any reason for this to only work intermitently.
							new_hash := plumbing.NewHash(new_oid)
							new_commit, err := pack_to_hook.repo.CommitObject(new_hash)
							if err != nil {
								wf_error(ssh_stderr, "Daemon failed to get new commit: %v", err)
								return 1
							}

							is_ancestor, err := old_commit.IsAncestor(new_commit)
							if err != nil {
								wf_error(ssh_stderr, "Daemon failed to check if old commit is ancestor: %v", err)
								return 1
							}

							if !is_ancestor {
								// TODO: Create MR snapshot ref instead
								all_ok = false
								fmt.Fprintln(ssh_stderr, ansiec.Red+"NAK"+ansiec.Reset, ref_name, "(force pushes are not supported yet)")
								continue
							}

							fmt.Fprintln(ssh_stderr, ansiec.Blue+"POK"+ansiec.Reset, ref_name)
						}
					} else { // Non-contrib branch
						all_ok = false
						fmt.Fprintln(ssh_stderr, ansiec.Red+"NAK"+ansiec.Reset, ref_name, "(you cannot push to branches outside of contrib/*)")
					}
				}

				fmt.Fprintln(ssh_stderr)
				if all_ok {
					fmt.Fprintln(ssh_stderr, "Overall "+ansiec.Green+"ACK"+ansiec.Reset+" (all checks passed)")
					return 0
				} else {
					fmt.Fprintln(ssh_stderr, "Overall "+ansiec.Red+"NAK"+ansiec.Reset+" (one or more branches failed checks)")
					return 1
				}
			}
		default:
			fmt.Fprintln(ssh_stderr, ansiec.Red+"Invalid hook:", args[0]+ansiec.Reset)
			return 1
		}
	}()

	fmt.Fprintln(ssh_stderr)

	_, _ = conn.Write([]byte{hook_return_value})
}

func serve_git_hooks(listener net.Listener) error {
	for {
		conn, err := listener.Accept()
		if err != nil {
			return err
		}
		go hooks_handle_connection(conn)
	}
}

func get_ucred(conn net.Conn) (*syscall.Ucred, error) {
	unix_conn := conn.(*net.UnixConn)
	fd, err := unix_conn.File()
	if err != nil {
		return nil, err_get_fd
	}
	defer fd.Close()

	ucred, err := syscall.GetsockoptUcred(int(fd.Fd()), syscall.SOL_SOCKET, syscall.SO_PEERCRED)
	if err != nil {
		return nil, err_get_ucred
	}
	return ucred, nil
}

func all_zero_num_string(s string) bool {
	for _, r := range s {
		if r != '0' {
			return false
		}
	}
	return true
}

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

package main

import (
	"github.com/go-git/go-git/v5"
	git_format_config "github.com/go-git/go-git/v5/plumbing/format/config"
)

// git_bare_init_with_default_hooks initializes a bare git repository with the
// forge-deployed hooks directory as the hooksPath.
func git_bare_init_with_default_hooks(repo_path string) (err error) {
	repo, err := git.PlainInit(repo_path, true)
	if err != nil {
		return err
	}

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

	git_config.Raw.SetOption("core", git_format_config.NoSubsection, "hooksPath", config.Hooks.Execs)

	err = repo.SetConfig(git_config)
	if err != nil {
		return err
	}

	return nil
}

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

package main

import (
	"context"
	"errors"
	"io"
	"strings"

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

// open_git_repo opens a git repository by group and repo name.
func open_git_repo(ctx context.Context, group_name, repo_name string) (repo *git.Repository, description string, repo_id int, err error) {
	var fs_path string
	err = database.QueryRow(ctx, "SELECT r.filesystem_path, COALESCE(r.description, ''), r.id FROM repos r JOIN groups g ON r.group_id = g.id WHERE g.name = $1 AND r.name = $2;", group_name, repo_name).Scan(&fs_path, &description, &repo_id)
	if err != nil {
		return
	}
	repo, err = git.PlainOpen(fs_path)
	return
}

// go-git's tree entries are not friendly for use in HTML templates.
type display_git_tree_entry_t struct {
	Name       string
	Mode       string
	Size       int64
	Is_file    bool
	Is_subtree bool
}

func build_display_git_tree(tree *object.Tree) []display_git_tree_entry_t {
	display_git_tree := make([]display_git_tree_entry_t, 0)
	for _, entry := range tree.Entries {
		display_git_tree_entry := display_git_tree_entry_t{}
		os_mode, err := entry.Mode.ToOSFileMode()
		if err != nil {
			display_git_tree_entry.Mode = "x---------"
		} else {
			display_git_tree_entry.Mode = os_mode.String()
		}
		display_git_tree_entry.Is_file = entry.Mode.IsFile()
		display_git_tree_entry.Size, err = tree.Size(entry.Name)
		if err != nil {
			display_git_tree_entry.Size = 0
		}
		display_git_tree_entry.Name = strings.TrimPrefix(entry.Name, "/")
		display_git_tree = append(display_git_tree, display_git_tree_entry)
	}
	return display_git_tree
}

func get_recent_commits(repo *git.Repository, head_hash plumbing.Hash, number_of_commits int) (recent_commits []*object.Commit, err error) {
	commit_iter, err := repo.Log(&git.LogOptions{From: head_hash})
	if err != nil {
		return nil, err
	}
	recent_commits = make([]*object.Commit, 0)
	defer commit_iter.Close()
	if number_of_commits < 0 {
		for {
			this_recent_commit, err := commit_iter.Next()
			if errors.Is(err, io.EOF) {
				return recent_commits, nil
			} else if err != nil {
				return nil, err
			}
			recent_commits = append(recent_commits, this_recent_commit)
		}
	} else {
		for range number_of_commits {
			this_recent_commit, err := commit_iter.Next()
			if errors.Is(err, io.EOF) {
				return recent_commits, nil
			} else if err != nil {
				return nil, err
			}
			recent_commits = append(recent_commits, this_recent_commit)
		}
	}
	return recent_commits, err
}

func get_patch_from_commit(commit_object *object.Commit) (parent_commit_hash plumbing.Hash, patch *object.Patch, ret_err error) {
	parent_commit_object, err := commit_object.Parent(0)
	if errors.Is(err, object.ErrParentNotFound) {
		commit_tree, err := commit_object.Tree()
		if err != nil {
			ret_err = err
			return
		}
		patch, err = (&object.Tree{}).Patch(commit_tree)
		if err != nil {
			ret_err = err
			return
		}
	} else if err != nil {
		ret_err = err
		return
	} else {
		parent_commit_hash = parent_commit_object.Hash
		patch, err = parent_commit_object.Patch(commit_object)
		if err != nil {
			ret_err = err
			return
		}
	}
	return
}

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

package main

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

// get_ref_hash_from_type_and_name returns the hash of a reference given its
// type and name as supplied in URL queries.
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, err := repo.Head()
		if err != nil {
			ret_err = 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 = err
			return
		}
		ref_hash = ref.Hash()
	case "tag":
		ref, err := repo.Reference(plumbing.NewTagReferenceName(ref_name), true)
		if err != nil {
			ret_err = err
			return
		}
		ref_hash = ref.Hash()
	default:
		panic("Invalid ref type " + ref_type)
	}
	return
}

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

package main

import (
	"net/http"
)

func get_user_info_from_request(r *http.Request) (id int, username string, err error) {
	session_cookie, err := r.Cookie("session")
	if err != nil {
		return
	}

	err = database.QueryRow(r.Context(), "SELECT user_id, COALESCE(username, '') FROM users u JOIN sessions s ON u.id = s.user_id WHERE s.session_id = $1;", session_cookie.Value).Scan(&id, &username)

	return
}

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

package main

// global_data is passed as "global" when rendering HTML templates.
var global_data = map[string]any{
	"server_public_key_string":      &server_public_key_string,
	"server_public_key_fingerprint": &server_public_key_fingerprint,
	"forge_version":                 VERSION,
	// Some other ones are populated after config parsing
}

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

package main

import (
	"net/http"
)

func handle_group_repos(w http.ResponseWriter, r *http.Request, params map[string]any) {
	group_name := params["group_name"]
	repos, err := query_name_desc_list(r.Context(), "SELECT r.name, COALESCE(r.description, '') FROM repos r JOIN groups g ON r.group_id = g.id WHERE g.name = $1;", group_name)
	if err != nil {
		http.Error(w, "Error getting groups: "+err.Error(), http.StatusInternalServerError)
		return
	}
	params["repos"] = repos

	render_template(w, "group_repos", params)
}

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

package main

import (
	"net/http"
)

func handle_index(w http.ResponseWriter, r *http.Request, params map[string]any) {
	groups, err := query_name_desc_list(r.Context(), "SELECT name, COALESCE(description, '') FROM groups")
	if err != nil {
		http.Error(w, "Error querying groups: "+err.Error(), http.StatusInternalServerError)
		return
	}
	params["groups"] = groups
	render_template(w, "index", params)
}

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

package main

import (
	"crypto/rand"
	"encoding/base64"
	"errors"
	"fmt"
	"net/http"
	"time"

	"github.com/alexedwards/argon2id"
	"github.com/jackc/pgx/v5"
)

func handle_login(w http.ResponseWriter, r *http.Request, params map[string]any) {
	if r.Method != "POST" {
		render_template(w, "login", params)
		return
	}

	var user_id int
	username := r.PostFormValue("username")
	password := r.PostFormValue("password")

	var password_hash string
	err := database.QueryRow(r.Context(), "SELECT id, COALESCE(password, '') FROM users WHERE username = $1", username).Scan(&user_id, &password_hash)
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			params["login_error"] = "Unknown username"
			render_template(w, "login", params)
			return
		}
		http.Error(w, "Error querying user information: "+err.Error(), http.StatusInternalServerError)
		return
	}
	if password_hash == "" {
		params["login_error"] = "User has no password"
		render_template(w, "login", params)
		return
	}

	match, err := argon2id.ComparePasswordAndHash(password, password_hash)
	if err != nil {
		http.Error(w, "Error comparing password and hash: "+err.Error(), http.StatusInternalServerError)
		return
	}

	if !match {
		params["login_error"] = "Invalid password"
		render_template(w, "login", params)
		return
	}

	cookie_value, err := random_urlsafe_string(16)
	if err != nil {
		http.Error(w, "Error getting random string: "+err.Error(), http.StatusInternalServerError)
		return
	}

	now := time.Now()
	expiry := now.Add(time.Duration(config.HTTP.CookieExpiry) * time.Second)

	cookie := http.Cookie{
		Name:     "session",
		Value:    cookie_value,
		SameSite: http.SameSiteLaxMode,
		HttpOnly: true,
		Secure:   false, // TODO
		Expires:  expiry,
		Path:     "/",
		// TODO: Expire
	}

	http.SetCookie(w, &cookie)

	_, err = database.Exec(r.Context(), "INSERT INTO sessions (user_id, session_id) VALUES ($1, $2)", user_id, cookie_value)
	if err != nil {
		http.Error(w, "Error inserting session: "+err.Error(), http.StatusInternalServerError)
		return
	}

	http.Redirect(w, r, "/", http.StatusSeeOther)
}

// random_urlsafe_string generates a random string of the given entropic size
// using the URL-safe base64 encoding. The actual size of the string returned
// will be 4*sz.
func random_urlsafe_string(sz int) (string, error) {
	r := make([]byte, 3*sz)
	_, err := rand.Read(r)
	if err != nil {
		return "", fmt.Errorf("error generating random string: %w", err)
	}
	return base64.RawURLEncoding.EncodeToString(r), nil
}

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

package main

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

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

// The file patch type from go-git isn't really usable in HTML templates
// either.
type usable_file_patch struct {
	From   diff.File
	To     diff.File
	Chunks []usable_chunk
}

type usable_chunk struct {
	Operation diff.Operation
	Content   string
}

func handle_repo_commit(w http.ResponseWriter, r *http.Request, params map[string]any) {
	repo, commit_id_specified_string := params["repo"].(*git.Repository), params["commit_id"].(string)

	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 {
		http.Error(w, "Error getting commit object: "+err.Error(), http.StatusInternalServerError)
		return
	}
	if commit_id_specified_string_without_suffix != commit_id_specified_string {
		patch, err := format_patch_from_commit(commit_object)
		if err != nil {
			http.Error(w, "Error formatting patch: "+err.Error(), http.StatusInternalServerError)
			return
		}
		fmt.Fprintln(w, 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
	}

	params["commit_object"] = commit_object
	params["commit_id"] = commit_id_string

	parent_commit_hash, patch, err := get_patch_from_commit(commit_object)
	if err != nil {
		http.Error(w, "Error getting patch from commit: "+err.Error(), http.StatusInternalServerError)
		return
	}
	params["parent_commit_hash"] = parent_commit_hash.String()
	params["patch"] = patch

	params["file_patches"] = make_usable_file_patches(patch)

	render_template(w, "repo_commit", params)
}

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("0000000000000000000000000000000000000000"),
	mode: misc.First_or_panic(filemode.New("100644")),
	path: "",
}

func make_usable_file_patches(patch diff.Patch) (usable_file_patches []usable_file_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
		}
		chunks := []usable_chunk{}
		for _, chunk := range file_patch.Chunks() {
			content := chunk.Content()
			if len(content) > 0 && content[0] == '\n' {
				content = "\n" + content
			} // Horrible hack to fix how browsers newlines that immediately proceed <pre>
			chunks = append(chunks, usable_chunk{
				Operation: chunk.Type(),
				Content:   content,
			})
		}
		usable_file_patch := usable_file_patch{
			Chunks: chunks,
			From:   from,
			To:     to,
		}
		usable_file_patches = append(usable_file_patches, usable_file_patch)
	}
	return
}

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

package main

import (
	"net/http"
)

type id_title_status_t struct {
	ID     int
	Title  string
	Status string
}

func handle_repo_contrib_index(w http.ResponseWriter, r *http.Request, params map[string]any) {
	rows, err := database.Query(r.Context(), "SELECT id, COALESCE(title, 'Untitled'), status FROM merge_requests WHERE repo_id = $1", params["repo_id"])
	if err != nil {
		http.Error(w, "Error querying merge requests: "+err.Error(), http.StatusInternalServerError)
		return
	}
	defer rows.Close()

	result := []id_title_status_t{}
	for rows.Next() {
		var id int
		var title, status string
		if err := rows.Scan(&id, &title, &status); err != nil {
			http.Error(w, "Error scanning merge request: "+err.Error(), http.StatusInternalServerError)
			return
		}
		result = append(result, id_title_status_t{id, title, status})
	}
	if err := rows.Err(); err != nil {
		http.Error(w, "Error ranging over merge requests: "+err.Error(), http.StatusInternalServerError)
		return
	}
	params["merge_requests"] = result

	render_template(w, "repo_contrib_index", params)
}

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

package main

import (
	"net/http"
	"strconv"

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

func handle_repo_contrib_one(w http.ResponseWriter, r *http.Request, params map[string]any) {
	mr_id_string := params["mr_id"].(string)
	mr_id, err := strconv.ParseInt(mr_id_string, 10, strconv.IntSize)
	if err != nil {
		http.Error(w, "Merge request ID not an integer: "+err.Error(), http.StatusBadRequest)
		return
	}

	var title, status, source_ref, destination_branch string
	err = database.QueryRow(r.Context(), "SELECT COALESCE(title, ''), status, source_ref, COALESCE(destination_branch, '') FROM merge_requests WHERE id = $1", mr_id).Scan(&title, &status, &source_ref, &destination_branch)
	if err != nil {
		http.Error(w, "Error querying merge request: "+err.Error(), http.StatusInternalServerError)
		return
	}

	repo := params["repo"].(*git.Repository)

	source_ref_hash, err := get_ref_hash_from_type_and_name(repo, "branch", source_ref)
	if err != nil {
		http.Error(w, "Error getting source ref hash: "+err.Error(), http.StatusInternalServerError)
		return
	}
	source_commit, err := repo.CommitObject(source_ref_hash)
	if err != nil {
		http.Error(w, "Error getting source commit: "+err.Error(), http.StatusInternalServerError)
		return
	}
	params["source_commit"] = source_commit

	var destination_branch_hash plumbing.Hash
	if destination_branch == "" {
		destination_branch = "HEAD"
		destination_branch_hash, err = get_ref_hash_from_type_and_name(repo, "", "")
	} else {
		destination_branch_hash, err = get_ref_hash_from_type_and_name(repo, "branch", destination_branch)
		if err != nil {
			http.Error(w, "Error getting destination branch hash: "+err.Error(), http.StatusInternalServerError)
			return
		}
	}
	destination_commit, err := repo.CommitObject(destination_branch_hash)
	if err != nil {
		http.Error(w, "Error getting destination commit: "+err.Error(), http.StatusInternalServerError)
		return
	}
	params["destination_commit"] = destination_commit

	patch, err := destination_commit.Patch(source_commit)
	if err != nil {
		http.Error(w, "Error getting patch: "+err.Error(), http.StatusInternalServerError)
		return
	}
	params["file_patches"] = make_usable_file_patches(patch)

	params["mr_title"], params["mr_status"], params["mr_source_ref"], params["mr_destination_branch"] = title, status, source_ref, destination_branch

	render_template(w, "repo_contrib_one", params)
}

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

package main

import (
	"net/http"

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

func handle_repo_index(w http.ResponseWriter, r *http.Request, params map[string]any) {
	repo, repo_name, group_name := params["repo"].(*git.Repository), params["repo_name"].(string), params["group_name"].(string)

	ref_hash, err := get_ref_hash_from_type_and_name(repo, params["ref_type"].(string), params["ref_name"].(string))
	if err != nil {
		http.Error(w, "Error getting ref hash: "+err.Error(), http.StatusInternalServerError)
		return
	}

	recent_commits, err := get_recent_commits(repo, ref_hash, 3)
	if err != nil {
		http.Error(w, "Error getting recent commits: "+err.Error(), http.StatusInternalServerError)
		return
	}
	params["commits"] = recent_commits
	commit_object, err := repo.CommitObject(ref_hash)
	if err != nil {
		http.Error(w, "Error getting commit object: "+err.Error(), http.StatusInternalServerError)
		return
	}
	tree, err := commit_object.Tree()
	if err != nil {
		http.Error(w, "Error getting file tree: "+err.Error(), http.StatusInternalServerError)
		return
	}

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

	params["http_clone_url"] = generate_http_remote_url(group_name, repo_name)
	params["ssh_clone_url"] = generate_ssh_remote_url(group_name, repo_name)

	render_template(w, "repo_index", params)
}

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

package main

import (
	"fmt"
	"io"
	"net/http"
	"os/exec"
)

func handle_repo_info(w http.ResponseWriter, r *http.Request, params map[string]any) (err error) {
	group_name, repo_name := params["group_name"].(string), params["repo_name"].(string)
	var repo_path string
	err = database.QueryRow(r.Context(), "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, repo_name).Scan(&repo_path)
	if err != nil {
		return err
	}

	w.Header().Set("Content-Type", "application/x-git-upload-pack-advertisement")
	w.WriteHeader(http.StatusOK)

	cmd := exec.Command("git", "upload-pack", "--stateless-rpc", "--advertise-refs", repo_path)

	stdout, err := cmd.StdoutPipe()
	if err != nil {
		return err
	}
	cmd.Stderr = cmd.Stdout
	defer func() {
		_ = stdout.Close()
	}()

	err = cmd.Start()
	if err != nil {
		return err
	}

	err = pack_line(w, "# service=git-upload-pack\n")
	if err != nil {
		return err
	}

	err = pack_flush(w)
	if err != nil {
		return
	}

	_, err = io.Copy(w, stdout)
	if err != nil {
		return err
	}

	err = cmd.Wait()
	if err != nil {
		return err
	}

	return nil
}

// Taken from https://github.com/icyphox/legit, MIT license
func pack_line(w io.Writer, s string) error {
	_, err := fmt.Fprintf(w, "%04x%s", len(s)+4, s)
	return err
}

// Taken from https://github.com/icyphox/legit, MIT license
func pack_flush(w io.Writer) error {
	_, err := fmt.Fprint(w, "0000")
	return err
}

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

package main

import (
	"net/http"

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

// TODO: I probably shouldn't include *all* commits here...
func handle_repo_log(w http.ResponseWriter, r *http.Request, params map[string]any) {
	repo := params["repo"].(*git.Repository)

	ref_hash, err := get_ref_hash_from_type_and_name(repo, params["ref_type"].(string), params["ref_name"].(string))
	if err != nil {
		http.Error(w, "Error getting ref hash: "+err.Error(), http.StatusInternalServerError)
		return
	}

	commits, err := get_recent_commits(repo, ref_hash, -1)
	if err != nil {
		http.Error(w, "Error getting recent commits: "+err.Error(), http.StatusInternalServerError)
		return
	}
	params["commits"] = commits

	render_template(w, "repo_log", params)
}

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

package main

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

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

func handle_repo_raw(w http.ResponseWriter, r *http.Request, params map[string]any) {
	raw_path_spec := params["rest"].(string)
	repo, path_spec := params["repo"].(*git.Repository), strings.TrimSuffix(raw_path_spec, "/")
	params["path_spec"] = path_spec

	ref_hash, err := get_ref_hash_from_type_and_name(repo, params["ref_type"].(string), params["ref_name"].(string))
	if err != nil {
		http.Error(w, "Error getting ref hash: "+err.Error(), http.StatusInternalServerError)
		return
	}

	commit_object, err := repo.CommitObject(ref_hash)
	if err != nil {
		http.Error(w, "Error getting commit object: "+err.Error(), http.StatusInternalServerError)
		return
	}
	tree, err := commit_object.Tree()
	if err != nil {
		http.Error(w, "Error getting file tree: "+err.Error(), http.StatusInternalServerError)
		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 {
				http.Error(w, "Error retrieving path: "+err.Error(), http.StatusInternalServerError)
				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 {
				http.Error(w, "Error reading file: "+err.Error(), http.StatusInternalServerError)
				return
			}
			fmt.Fprintln(w, 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
	}

	params["files"] = build_display_git_tree(target)

	render_template(w, "repo_raw_dir", params)
}

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

package main

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

func handle_repo_tree(w http.ResponseWriter, r *http.Request, params map[string]any) {
	raw_path_spec := params["rest"].(string)
	repo, path_spec := params["repo"].(*git.Repository), strings.TrimSuffix(raw_path_spec, "/")
	params["path_spec"] = path_spec

	ref_hash, err := get_ref_hash_from_type_and_name(repo, params["ref_type"].(string), params["ref_name"].(string))
	if err != nil {
		http.Error(w, "Error getting ref hash: "+err.Error(), http.StatusInternalServerError)
		return
	}
	commit_object, err := repo.CommitObject(ref_hash)
	if err != nil {
		http.Error(w, "Error getting commit object: "+err.Error(), http.StatusInternalServerError)
		return
	}
	tree, err := commit_object.Tree()
	if err != nil {
		http.Error(w, "Error getting file tree: "+err.Error(), http.StatusInternalServerError)
		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 {
				http.Error(w, "Error retrieving path: "+err.Error(), http.StatusInternalServerError)
				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 {
				http.Error(w, "Error reading file: "+err.Error(), http.StatusInternalServerError)
				return
			}
			lexer := chroma_lexers.Match(path_spec)
			if lexer == nil {
				lexer = chroma_lexers.Fallback
			}
			iterator, err := lexer.Tokenise(nil, file_contents)
			if err != nil {
				http.Error(w, "Error tokenizing code: "+err.Error(), http.StatusInternalServerError)
				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 {
				http.Error(w, "Error formatting code: "+err.Error(), http.StatusInternalServerError)
				return
			}
			formatted_encapsulated := template.HTML(formatted_unencapsulated.Bytes())
			params["file_contents"] = formatted_encapsulated

			render_template(w, "repo_tree_file", params)
			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
	}

	params["readme_filename"], params["readme"] = render_readme_at_tree(target)
	params["files"] = build_display_git_tree(target)

	render_template(w, "repo_tree_dir", params)
}

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

package main

import (
	"io"
	"net/http"
	"os"
	"os/exec"
)

func handle_upload_pack(w http.ResponseWriter, r *http.Request, params map[string]any) (err error) {
	group_name, repo_name := params["group_name"].(string), params["repo_name"].(string)
	var repo_path string
	err = database.QueryRow(r.Context(), "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, repo_name).Scan(&repo_path)
	if err != nil {
		return err
	}

	w.Header().Set("Content-Type", "application/x-git-upload-pack-result")
	w.Header().Set("Connection", "Keep-Alive")
	w.Header().Set("Transfer-Encoding", "chunked")
	w.WriteHeader(http.StatusOK)

	cmd := exec.Command("git", "upload-pack", "--stateless-rpc", repo_path)
	cmd.Env = append(os.Environ(), "LINDENII_FORGE_HOOKS_SOCKET_PATH="+config.Hooks.Socket)
	stdout, err := cmd.StdoutPipe()
	if err != nil {
		return err
	}
	cmd.Stderr = cmd.Stdout
	defer func() {
		_ = stdout.Close()
	}()

	stdin, err := cmd.StdinPipe()
	if err != nil {
		return err
	}
	defer func() {
		_ = stdin.Close()
	}()

	err = cmd.Start()
	if err != nil {
		return err
	}

	_, err = io.Copy(stdin, r.Body)
	if err != nil {
		return err
	}

	err = stdin.Close()
	if err != nil {
		return err
	}

	_, err = io.Copy(w, stdout)
	if err != nil {
		return err
	}

	err = cmd.Wait()
	if err != nil {
		return err
	}

	return nil
}

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

package main

import (
	"net/http"
)

func handle_users(w http.ResponseWriter, r *http.Request, params map[string]any) {
	http.Error(w, "Not implemented", http.StatusNotImplemented)
}

// 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

	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))
}

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

	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]
		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]
		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 {
						http.Error(w, err.Error(), http.StatusInternalServerError)
					}
					return
				case "git-upload-pack":
					err = handle_upload_pack(w, r, params)
					if 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 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 {
				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 {
		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 (
	"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)
}

// 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 {
			clog.Fatal(1, "Removing stale socket: "+err.Error())
		}
		hooks_listener, err = net.Listen("unix", config.Hooks.Socket)
		if 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 {
			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 {
			clog.Fatal(1, "Removing stale socket: "+err.Error())
		}
		ssh_listener, err = net.Listen(config.SSH.Net, config.SSH.Addr)
		if 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 {
			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 {
			clog.Fatal(1, "Removing stale socket: "+err.Error())
		}
		http_listener, err = net.Listen(config.HTTP.Net, config.HTTP.Addr)
		if 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 {
			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 (
	"net/url"
	"strings"
)

// We don't use path.Join because it collapses multiple slashes into one.

func generate_ssh_remote_url(group_name, repo_name string) string {
	return strings.TrimSuffix(config.SSH.Root, "/") + "/" + url.PathEscape(group_name) + "/:/repos/" + url.PathEscape(repo_name)
}

func generate_http_remote_url(group_name, repo_name string) string {
	return strings.TrimSuffix(config.HTTP.Root, "/") + "/" + url.PathEscape(group_name) + "/:/repos/" + url.PathEscape(repo_name)
}

// 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 {
		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 {
		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 {
		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 {
		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 {
		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 = 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 {
		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, "/"), "/")

	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
	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]
	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 (
	"errors"
	"net/http"
	"net/url"
	"strings"
)

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
		}
	}

	params, err = url.ParseQuery(params_string)
	return
}

func redirect_with_slash(w http.ResponseWriter, r *http.Request) bool {
	request_uri := r.RequestURI

	path_end := strings.IndexAny(request_uri, "?#")
	var path, rest string
	if path_end == -1 {
		path = request_uri
	} else {
		path = request_uri[:path_end]
		rest = request_uri[path_end:]
	}

	if !strings.HasSuffix(path, "/") {
		http.Redirect(w, r, path+"/"+rest, http.StatusSeeOther)
		return true
	}
	return false
}

func redirect_without_slash(w http.ResponseWriter, r *http.Request) bool {
	request_uri := r.RequestURI

	path_end := strings.IndexAny(request_uri, "?#")
	var path, rest string
	if path_end == -1 {
		path = request_uri
	} else {
		path = request_uri[:path_end]
		rest = request_uri[path_end:]
	}

	if strings.HasSuffix(path, "/") {
		http.Redirect(w, r, strings.TrimSuffix(path, "/")+rest, http.StatusSeeOther)
		return true
	}
	return false
}

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

package main

import (
	"context"
)

func add_user_ssh(ctx context.Context, pubkey string) (user_id int, err error) {
	tx, err := database.Begin(ctx)
	if 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 {
		return
	}

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

	err = tx.Commit(ctx)
	return
}