package main

import (
	"context"
	"database/sql"
	_ "embed"
	"fmt"
	"time"

	_ "github.com/mattn/go-sqlite3"

	"github.com/mattn/go-sqlite3"

)

//go:embed schema.sql
var schema string

var errNoDBRows = sql.ErrNoRows

type DB struct {
	db *sql.DB
}

func openDB(filename string) (*DB, error) {
	sqlDB, err := sql.Open("sqlite3", filename)
	if err != nil {
		return nil, err
	}

	db := &DB{sqlDB}
	if err := db.init(context.TODO()); err != nil {
		db.Close()
		return nil, err
	}

	return db, nil
}

func (db *DB) init(ctx context.Context) error {
	var n int
	if err := db.db.QueryRowContext(ctx, "SELECT COUNT(*) FROM sqlite_schema").Scan(&n); err != nil {
		return err
	} else if n != 0 {
		return nil
	}

	if _, err := db.db.ExecContext(ctx, schema); err != nil {
		return err
	}

	// TODO: drop this
	defaultUser := User{Username: "root"}
	if err := defaultUser.SetPassword("root"); err != nil {
		return err
	}
	return db.StoreUser(ctx, &defaultUser)
}

func (db *DB) Close() error {
	return db.db.Close()
}

func (db *DB) FetchUser(ctx context.Context, id ID[*User]) (*User, error) {
	rows, err := db.db.QueryContext(ctx, "SELECT * FROM User WHERE id = ?", id)
	if err != nil {
		return nil, err
	}
	var user User
	err = scanRow(&user, rows)
	return &user, err
}

func (db *DB) FetchUserByUsername(ctx context.Context, username string) (*User, error) {
	rows, err := db.db.QueryContext(ctx, "SELECT * FROM User WHERE username = ?", username)
	if err != nil {
		return nil, err
	}
	var user User
	err = scanRow(&user, rows)
	return &user, err
}

func (db *DB) StoreUser(ctx context.Context, user *User) error {
	return db.db.QueryRowContext(ctx, `
		INSERT INTO User(id, username, password_hash)
		VALUES (:id, :username, :password_hash)
		ON CONFLICT(id) DO UPDATE SET
			username = :username,
			password_hash = :password_hash
		RETURNING id
	`, entityArgs(user)...).Scan(&user.ID)
}

func (db *DB) ListUsers(ctx context.Context) ([]User, error) {
	rows, err := db.db.QueryContext(ctx, "SELECT * FROM User")
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var l []User
	for rows.Next() {
		var user User
		if err := scan(&user, rows); err != nil {
			return nil, err
		}
		l = append(l, user)
	}

	return l, rows.Close()
}

func (db *DB) FetchClient(ctx context.Context, id ID[*Client]) (*Client, error) {
	rows, err := db.db.QueryContext(ctx, "SELECT * FROM Client WHERE id = ?", id)
	if err != nil {
		return nil, err
	}
	var client Client
	err = scanRow(&client, rows)
	return &client, err
}

func (db *DB) FetchClientByClientID(ctx context.Context, clientID string) (*Client, error) {
	rows, err := db.db.QueryContext(ctx, "SELECT * FROM Client WHERE client_id = ?", clientID)
	if err != nil {
		return nil, err
	}
	var client Client
	err = scanRow(&client, rows)
	return &client, err
}

func (db *DB) StoreClient(ctx context.Context, client *Client) error {
	return db.db.QueryRowContext(ctx, `
		INSERT INTO Client(id, client_id, client_secret_hash, owner,
			redirect_uris, client_name, client_uri)
		VALUES (:id, :client_id, :client_secret_hash, :owner,
			:redirect_uris, :client_name, :client_uri)
		ON CONFLICT(id) DO UPDATE SET
			client_id = :client_id,
			client_secret_hash = :client_secret_hash,
			owner = :owner,
			redirect_uris = :redirect_uris,
			client_name = :client_name,
			client_uri = :client_uri
		RETURNING id
	`, entityArgs(client)...).Scan(&client.ID)
}

func (db *DB) ListClients(ctx context.Context, owner ID[*User]) ([]Client, error) {
	rows, err := db.db.QueryContext(ctx, "SELECT * FROM Client WHERE owner IS ?", owner)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var l []Client
	for rows.Next() {
		var client Client
		if err := scan(&client, rows); err != nil {
			return nil, err
		}
		l = append(l, client)

	}

	return l, rows.Close()
}

func (db *DB) ListAuthorizedClients(ctx context.Context, user ID[*User]) ([]AuthorizedClient, error) {
	rows, err := db.db.QueryContext(ctx, `
		SELECT client_id, client_name, client_uri, token.expires_at
		FROM Client,
		(
			SELECT client, MAX(expires_at) as expires_at
			FROM AccessToken
			WHERE user = ?
			GROUP BY client
		) AS token
		WHERE Client.id = token.client
	`, user)
	if err != nil {
		return nil, err
	}

	var l []AuthorizedClient
	for rows.Next() {
		var authClient AuthorizedClient
		columns := authClient.Client.columns()
		var expiresAt string
		err := rows.Scan(columns["client_id"], columns["client_name"], columns["client_uri"], &expiresAt)
		if err != nil {
			return nil, err
		}
		authClient.ExpiresAt, err = time.Parse(sqlite3.SQLiteTimestampFormats[0], expiresAt)
		if err != nil {
			return nil, err
		}
		l = append(l, authClient)

	}

	return l, rows.Close()
}

func (db *DB) DeleteClient(ctx context.Context, id ID[*Client]) error {
	_, err := db.db.ExecContext(ctx, "DELETE FROM Client WHERE id = ?", id)
	return err
}

func (db *DB) FetchAccessToken(ctx context.Context, id ID[*AccessToken]) (*AccessToken, error) {
	rows, err := db.db.QueryContext(ctx, "SELECT * FROM AccessToken WHERE id = ?", id)
	if err != nil {
		return nil, err
	}
	var token AccessToken
	err = scanRow(&token, rows)
	return &token, err
}

func (db *DB) CreateAccessToken(ctx context.Context, token *AccessToken) error {
	return db.db.QueryRowContext(ctx, `
		INSERT INTO AccessToken(hash, user, client, scope, issued_at, expires_at)
		VALUES (:hash, :user, :client, :scope, :issued_at, :expires_at)
		RETURNING id
	`, entityArgs(token)...).Scan(&token.ID)
}

func (db *DB) CreateAuthCode(ctx context.Context, code *AuthCode) error {
	return db.db.QueryRowContext(ctx, `
		INSERT INTO AuthCode(hash, created_at, user, client, scope)
		VALUES (:hash, :created_at, :user, :client, :scope)
		RETURNING id
	`, entityArgs(code)...).Scan(&code.ID)
}

func (db *DB) PopAuthCode(ctx context.Context, id ID[*AuthCode]) (*AuthCode, error) {
	rows, err := db.db.QueryContext(ctx, `
		DELETE FROM AuthCode
		WHERE id = ?
		RETURNING *
	`, id)
	if err != nil {
		return nil, err
	}
	var authCode AuthCode
	err = scanRow(&authCode, rows)
	return &authCode, err
}

func (db *DB) Maintain(ctx context.Context) error {
	_, err := db.db.ExecContext(ctx, `
		DELETE FROM AccessToken
		WHERE timediff('now', expires_at) > 0
	`)
	if err != nil {
		return err
	}

	_, err = db.db.ExecContext(ctx, `
		DELETE FROM AuthCode
		WHERE timediff(?, created_at) > 0
	`, time.Now().Add(-authCodeExpiration))
	if err != nil {
		return err
	}

	return nil
}

func scan(e entity, rows *sql.Rows) error {
	columns := e.columns()

	keys, err := rows.Columns()
	if err != nil {
		panic(err)
	}
	out := make([]interface{}, len(keys))
	for i, k := range keys {
		v, ok := columns[k]
		if !ok {
			panic(fmt.Errorf("unknown column %q", k))
		}
		out[i] = v
	}

	return rows.Scan(out...)
}

func scanRow(e entity, rows *sql.Rows) error {
	if !rows.Next() {
		return sql.ErrNoRows
	}
	if err := scan(e, rows); err != nil {
		return err
	}
	return rows.Close()
}

func entityArgs(e entity) []interface{} {
	columns := e.columns()

	l := make([]interface{}, 0, len(columns))
	for k, v := range columns {
		l = append(l, sql.Named(k, v))
	}

	return l
}

package main

import (
	"crypto/rand"
	"crypto/sha512"
	"crypto/subtle"
	"database/sql"
	"database/sql/driver"
	"encoding/base64"
	"fmt"
	"strconv"
	"strings"
	"time"

	"golang.org/x/crypto/bcrypt"
)

const (
	accessTokenExpiration = 30 * 24 * time.Hour
	authCodeExpiration    = 10 * time.Minute
)

type entity interface {
	columns() map[string]interface{}
}

var (
	_ entity = (*User)(nil)
	_ entity = (*Client)(nil)
	_ entity = (*AccessToken)(nil)
	_ entity = (*AuthCode)(nil)
)

type ID[T entity] int64

var (
	_ sql.Scanner   = (*ID[*User])(nil)
	_ driver.Valuer = ID[*User](0)
)

func ParseID[T entity](s string) (ID[T], error) {
	u, _ := strconv.ParseUint(s, 10, 63)
	if u == 0 {
		return 0, fmt.Errorf("invalid ID")
	}
	return ID[T](u), nil
}

func (ptr *ID[T]) Scan(v interface{}) error {
	if v == nil {
		*ptr = 0
		return nil
	}
	id, ok := v.(int64)
	if !ok {
		return fmt.Errorf("cannot scan ID from %T", v)
	}
	*ptr = ID[T](id)
	return nil
}

func (id ID[T]) Value() (driver.Value, error) {
	if id == 0 {
		return nil, nil
	} else {
		return int64(id), nil
	}
}

type nullString string

var (
	_ sql.Scanner   = (*nullString)(nil)
	_ driver.Valuer = (*nullString)(nil)
)

func (ptr *nullString) Scan(v interface{}) error {
	if v == nil {
		*ptr = ""
		return nil
	}
	s, ok := v.(string)
	if !ok {
		return fmt.Errorf("cannot scan nullStringPtr from %T", v)
	}
	*ptr = nullString(s)
	return nil
}

func (ptr *nullString) Value() (driver.Value, error) {
	if *ptr == "" {
		return nil, nil
	} else {
		return string(*ptr), nil
	}
}

type User struct {
	ID           ID[*User]
	Username     string
	PasswordHash string
	Admin        bool
}

func (user *User) columns() map[string]interface{} {
	return map[string]interface{}{
		"id":            &user.ID,
		"username":      &user.Username,
		"password_hash": (*nullString)(&user.PasswordHash),
		"admin":         &user.Admin,
	}
}

func (user *User) VerifyPassword(password string) error {
	// TODO: upgrade hash
	return bcrypt.CompareHashAndPassword([]byte(user.PasswordHash), []byte(password))
}

func (user *User) SetPassword(password string) error {
	hash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
	if err != nil {
		return err
	}
	user.PasswordHash = string(hash)
	return nil
}

func (user *User) PasswordNeedsRehash() bool {
	cost, _ := bcrypt.Cost([]byte(user.PasswordHash))
	return cost != bcrypt.DefaultCost
}

type Client struct {
	ID               ID[*Client]
	ClientID         string
	ClientSecretHash []byte
	Owner            ID[*User]
	RedirectURIs     string
	ClientName       string
	ClientURI        string
}

func (client *Client) Generate(isPublic bool) (secret string, err error) {
	id, err := generateUID()
	if err != nil {
		return "", fmt.Errorf("failed to generate client ID: %v", err)
	}
	client.ClientID = id

	if !isPublic {
		var hash []byte
		secret, hash, err = generateSecret()
		if err != nil {
			return "", fmt.Errorf("failed to generate client secret: %v", err)
		}
		client.ClientSecretHash = hash
	}

	return secret, nil
}

func (client *Client) columns() map[string]interface{} {
	return map[string]interface{}{
		"id":                 &client.ID,
		"client_id":          &client.ClientID,
		"client_secret_hash": &client.ClientSecretHash,
		"owner":              &client.Owner,
		"redirect_uris":      (*nullString)(&client.RedirectURIs),
		"client_name":        (*nullString)(&client.ClientName),
		"client_uri":         (*nullString)(&client.ClientURI),
	}
}

func (client *Client) VerifySecret(secret string) bool {
	return verifyHash(client.ClientSecretHash, secret)
}

func (client *Client) IsPublic() bool {
	return client.ClientSecretHash == nil
}

type AccessToken struct {
	ID        ID[*AccessToken]
	Hash      []byte
	User      ID[*User]
	Client    ID[*Client]
	Scope     string
	IssuedAt  time.Time
	ExpiresAt time.Time
}

func (token *AccessToken) Generate() (secret string, err error) {
	secret, hash, err := generateSecret()
	if err != nil {
		return "", fmt.Errorf("failed to generate access token secret: %v", err)
	}
	token.Hash = hash
	token.IssuedAt = time.Now()
	token.ExpiresAt = time.Now().Add(accessTokenExpiration)
	return secret, nil
}

func NewAccessTokenFromAuthCode(authCode *AuthCode) (token *AccessToken, secret string, err error) {
	token = &AccessToken{
		User:   authCode.User,
		Client: authCode.Client,
		Scope:  authCode.Scope,
	}
	secret, err = token.Generate()
	return token, secret, err
}

func (token *AccessToken) columns() map[string]interface{} {
	return map[string]interface{}{
		"id":         &token.ID,
		"hash":       &token.Hash,
		"user":       &token.User,
		"client":     &token.Client,
		"scope":      (*nullString)(&token.Scope),
		"issued_at":  &token.IssuedAt,
		"expires_at": &token.ExpiresAt,
	}
}

func (token *AccessToken) VerifySecret(secret string) bool {
	return verifyHash(token.Hash, secret) && verifyExpiration(token.ExpiresAt)
}

type AuthorizedClient struct {
	Client    Client
	ExpiresAt time.Time
}

type AuthCode struct {
	ID        ID[*AuthCode]
	Hash      []byte
	CreatedAt time.Time
	User      ID[*User]
	Client    ID[*Client]
	Scope     string
}

func NewAuthCode(user ID[*User], client ID[*Client], scope string) (code *AuthCode, secret string, err error) {
	secret, hash, err := generateSecret()
	if err != nil {
		return nil, "", fmt.Errorf("failed to generate authentication code secret: %v", err)
	}
	code = &AuthCode{
		Hash:      hash,
		CreatedAt: time.Now(),
		User:      user,
		Client:    client,
		Scope:     scope,
	}
	return code, secret, nil
}

func (code *AuthCode) columns() map[string]interface{} {
	return map[string]interface{}{
		"id":         &code.ID,
		"hash":       &code.Hash,
		"created_at": &code.CreatedAt,
		"user":       &code.User,
		"client":     &code.Client,
		"scope":      (*nullString)(&code.Scope),
	}
}

func (code *AuthCode) VerifySecret(secret string) bool {
	return verifyHash(code.Hash, secret) && verifyExpiration(code.CreatedAt.Add(authCodeExpiration))
}

func UnmarshalSecret[T entity](s string) (id ID[T], secret string, err error) {
	idStr, secret, _ := strings.Cut(s, ".")
	id, err = ParseID[T](idStr)
	return id, secret, err
}

func MarshalSecret[T entity](id ID[T], secret string) string {
	if id == 0 {
		panic("cannot marshal zero ID")
	}
	return fmt.Sprintf("%v.%v", int64(id), secret)
}

func generateUID() (string, error) {
	b := make([]byte, 32)
	if _, err := rand.Read(b); err != nil {
		return "", err
	}
	return base64.RawURLEncoding.EncodeToString(b), nil
}

func generateSecret() (secret string, hash []byte, err error) {
	b := make([]byte, 32)
	if _, err := rand.Read(b); err != nil {
		return "", nil, err
	}
	secret = base64.RawURLEncoding.EncodeToString(b)
	h := sha512.Sum512(b)
	return secret, h[:], nil
}

func verifyHash(hash []byte, secret string) bool {
	b, _ := base64.RawURLEncoding.DecodeString(secret)
	h := sha512.Sum512(b)
	return subtle.ConstantTimeCompare(hash, h[:]) == 1
}

func verifyExpiration(t time.Time) bool {
	return time.Now().Before(t)
}

{{ template "head.html" }}

<main>

<h1>sinwon</h1>

<p>Welcome, {{ .Me.Username }}!</p>

<form method="post">
	<a href="/user/{{ .Me.ID }}"><button type="button">Settings</button></a>
	<button type="submit" formaction="/logout">Logout</button>
</form>

<h2>Authorized clients</h2>

{{ with .AuthorizedClients }}
	<table>
		<tr>
			<th>Client</th>
			<th>Authorized until</th>
		</tr>
		{{ range . }}
			<tr>
				<td>
					{{ with .Client }}
						{{ if .ClientURI }}
							<a href="{{ .ClientURI }}" target="_blank">
						{{ end }}
						{{ if .ClientName }}
							{{ .ClientName }}
						{{ else }}
							<code>{{ .ClientID }}</code>
						{{ end }}
						{{ if .ClientURI }}
							</a>
						{{ end }}
					{{ end }}
				</td>
				<td>{{ .ExpiresAt }}</td>
			</tr>
		{{ end }}
	</table>
{{ else }}
	<p>No client authorized yet.</p>
{{ end }}

{{ if .Me.Admin }}

	<h2>Clients</h2>

	<h2>Registered clients</h2>

	{{ with .Clients }}
		<p>
			<a href="/client/new"><button type="button">Register new client</button></a>
		</p>

		<table>
			<tr>
				<th>Client ID</th>
				<th>Name</th>
			</tr>
			{{ range . }}
				<tr>
					<td><a href="/client/{{ .ID }}"><code>{{ .ClientID }}</code></a></td>
					<td>{{ .ClientName }}</td>
				</tr>
			{{ end }}
		</table>
	{{ else }}
		<p>No client registered yet.</p>
	{{ end }}

	<h2>Users</h2>

	<p>
		<a href="/user/new"><button type="button">Create user</button></a>
	</p>

	<table>
		<tr>
			<th>Username</th>
			<th>Role</th>
		</tr>
		{{ range .Users }}
			<tr>
				<td><a href="/user/{{ .ID }}">{{ .Username }}</a></td>
				<td>
					{{ if .Admin }}
						Administrator
					{{ else }}
						Regular user
					{{ end}}
				</td>
			</tr>
		{{ end }}
	</table>
{{ end }}

</main>

{{ template "foot.html" }}

package main

import (
	"fmt"
	"log"
	"net/http"
	"net/url"

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

func index(w http.ResponseWriter, req *http.Request) {
	ctx := req.Context()
	db := dbFromContext(ctx)
	tpl := templateFromContext(ctx)

	loginToken := loginTokenFromContext(ctx)
	if loginToken == nil {
		http.Redirect(w, req, "/login", http.StatusFound)
		return
	}

	me, err := db.FetchUser(ctx, loginToken.User)
	if err != nil {
		httpError(w, err)
		return
	}

	authorizedClients, err := db.ListAuthorizedClients(ctx, loginToken.User)
	if err != nil {
		httpError(w, err)
		return
	}

	clients, err := db.ListClients(ctx, loginToken.User)
	if err != nil {
		httpError(w, err)
		return
	}

	var users []User
	if me.Admin {
		users, err = db.ListUsers(ctx)
		if err != nil {
			httpError(w, err)
			return
		}
	}

	data := struct {

		Me      *User
		Clients []Client
		Users   []User

		Me                *User
		AuthorizedClients []AuthorizedClient
		Clients           []Client
		Users             []User

	}{

		Me:      me,
		Clients: clients,
		Users:   users,

		Me:                me,
		AuthorizedClients: authorizedClients,
		Clients:           clients,
		Users:             users,

	}
	if err := tpl.ExecuteTemplate(w, "index.html", &data); err != nil {
		panic(err)
	}
}

func login(w http.ResponseWriter, req *http.Request) {
	ctx := req.Context()
	db := dbFromContext(ctx)
	tpl := templateFromContext(ctx)

	q := req.URL.Query()
	rawRedirectURI := q.Get("redirect_uri")
	if rawRedirectURI == "" {
		rawRedirectURI = "/"
	}

	redirectURI, err := url.Parse(rawRedirectURI)
	if err != nil || redirectURI.Scheme != "" || redirectURI.Opaque != "" || redirectURI.User != nil || redirectURI.Host != "" {
		http.Error(w, "Invalid redirect URI", http.StatusBadRequest)
		return
	}

	if loginTokenFromContext(ctx) != nil {
		http.Redirect(w, req, redirectURI.String(), http.StatusFound)
		return
	}

	username := req.PostFormValue("username")
	password := req.PostFormValue("password")
	if username == "" {
		if err := tpl.ExecuteTemplate(w, "login.html", nil); err != nil {
			panic(err)
		}
		return
	}

	user, err := db.FetchUserByUsername(ctx, username)
	if err != nil && err != errNoDBRows {
		httpError(w, fmt.Errorf("failed to fetch user: %v", err))
		return
	}
	if err == nil {
		err = user.VerifyPassword(password)
	}
	if err != nil {
		log.Printf("login failed for user %q: %v", username, err)
		// TODO: show error message
		if err := tpl.ExecuteTemplate(w, "login.html", nil); err != nil {
			panic(err)
		}
		return
	}

	if user.PasswordNeedsRehash() {
		if err := user.SetPassword(password); err != nil {
			httpError(w, fmt.Errorf("failed to rehash password: %v", err))
			return
		}
		if err := db.StoreUser(ctx, user); err != nil {
			httpError(w, fmt.Errorf("failed to store user: %v", err))
			return
		}
	}

	token := AccessToken{
		User:  user.ID,
		Scope: internalTokenScope,
	}
	secret, err := token.Generate()
	if err != nil {
		httpError(w, fmt.Errorf("failed to generate access token: %v", err))
		return
	}
	if err := db.CreateAccessToken(ctx, &token); err != nil {
		httpError(w, fmt.Errorf("failed to create access token: %v", err))
		return
	}

	setLoginTokenCookie(w, req, &token, secret)
	http.Redirect(w, req, redirectURI.String(), http.StatusFound)
}

func logout(w http.ResponseWriter, req *http.Request) {
	unsetLoginTokenCookie(w, req)
	http.Redirect(w, req, "/login", http.StatusFound)
}

func manageUser(w http.ResponseWriter, req *http.Request) {
	ctx := req.Context()
	db := dbFromContext(ctx)
	tpl := templateFromContext(ctx)

	user := new(User)
	if idStr := chi.URLParam(req, "id"); idStr != "" {
		id, err := ParseID[*User](idStr)
		if err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}

		user, err = db.FetchUser(ctx, id)
		if err != nil {
			httpError(w, err)
			return
		}
	}

	loginToken := loginTokenFromContext(ctx)
	if loginToken == nil {
		http.Redirect(w, req, "/login", http.StatusFound)
		return
	}

	me, err := db.FetchUser(ctx, loginToken.User)
	if err != nil {
		httpError(w, err)
		return
	} else if loginToken.User != user.ID && !me.Admin {
		http.Error(w, "Access denied", http.StatusForbidden)
		return
	}

	username := req.PostFormValue("username")
	password := req.PostFormValue("password")
	admin := req.PostFormValue("admin") == "on"
	if username == "" {
		data := struct {
			User *User
			Me   *User
		}{
			User: user,
			Me:   me,
		}
		if err := tpl.ExecuteTemplate(w, "manage-user.html", &data); err != nil {
			panic(err)
		}
		return
	}

	user.Username = username
	if me.Admin && user.ID != me.ID {
		user.Admin = admin
	}
	if password != "" {
		if err := user.SetPassword(password); err != nil {
			httpError(w, err)
			return
		}
	}

	if err := db.StoreUser(ctx, user); err != nil {
		httpError(w, err)
		return
	}

	http.Redirect(w, req, "/", http.StatusFound)
}