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auth_flow.go
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auth_flow.go
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package telegram
import (
"context"
"errors"
"fmt"
"io"
"os"
"strconv"
"strings"
"golang.org/x/xerrors"
"github.com/gotd/td/internal/crypto"
"github.com/gotd/td/tg"
)
// NewAuth initializes new authentication flow.
func NewAuth(auth UserAuthenticator, opt SendCodeOptions) AuthFlow {
return AuthFlow{
Auth: auth,
Options: opt,
}
}
// AuthFlow simplifies boilerplate for authentication flow.
type AuthFlow struct {
Auth UserAuthenticator
Options SendCodeOptions
}
// Run starts authentication flow on client.
func (f AuthFlow) Run(ctx context.Context, client AuthFlowClient) error {
if f.Auth == nil {
return xerrors.New("no UserAuthenticator provided")
}
phone, err := f.Auth.Phone(ctx)
if err != nil {
return xerrors.Errorf("get phone: %w", err)
}
sentCode, err := client.AuthSendCode(ctx, phone, f.Options)
if err != nil {
return xerrors.Errorf("send code: %w", err)
}
hash := sentCode.PhoneCodeHash
code, err := f.Auth.Code(ctx, sentCode)
if err != nil {
return xerrors.Errorf("get code: %w", err)
}
_, signInErr := client.AuthSignIn(ctx, phone, code, hash)
if errors.Is(signInErr, ErrPasswordAuthNeeded) {
password, err := f.Auth.Password(ctx)
if err != nil {
return xerrors.Errorf("get password: %w", err)
}
if _, err := client.AuthPassword(ctx, password); err != nil {
return xerrors.Errorf("sign in with password: %w", err)
}
return nil
}
var signUpRequired *SignUpRequired
if errors.As(signInErr, &signUpRequired) {
if err := f.Auth.AcceptTermsOfService(ctx, signUpRequired.TermsOfService); err != nil {
return xerrors.Errorf("confirm TOS: %w", err)
}
info, err := f.Auth.SignUp(ctx)
if err != nil {
return xerrors.Errorf("sign up info not provided: %w", err)
}
if _, err := client.AuthSignUp(ctx, SignUp{
PhoneNumber: phone,
PhoneCodeHash: hash,
FirstName: info.FirstName,
LastName: info.LastName,
}); err != nil {
return xerrors.Errorf("sign up: %w", err)
}
return nil
}
if signInErr != nil {
return xerrors.Errorf("sign in: %w", signInErr)
}
return nil
}
// AuthFlowClient abstracts telegram client for AuthFlow.
type AuthFlowClient interface {
AuthSignIn(ctx context.Context, phone, code, codeHash string) (*tg.AuthAuthorization, error)
AuthSendCode(ctx context.Context, phone string, options SendCodeOptions) (*tg.AuthSentCode, error)
AuthPassword(ctx context.Context, password string) (*tg.AuthAuthorization, error)
AuthSignUp(ctx context.Context, s SignUp) (*tg.AuthAuthorization, error)
}
// CodeAuthenticator asks user for received authentication code.
type CodeAuthenticator interface {
Code(ctx context.Context, sentCode *tg.AuthSentCode) (string, error)
}
// CodeAuthenticatorFunc is functional wrapper for CodeAuthenticator.
type CodeAuthenticatorFunc func(ctx context.Context, sentCode *tg.AuthSentCode) (string, error)
// Code implements CodeAuthenticator interface.
func (c CodeAuthenticatorFunc) Code(ctx context.Context, sentCode *tg.AuthSentCode) (string, error) {
return c(ctx, sentCode)
}
// UserInfo represents user info required for sign up.
type UserInfo struct {
FirstName string
LastName string
}
// UserAuthenticator asks user for phone, password and received authentication code.
type UserAuthenticator interface {
Phone(ctx context.Context) (string, error)
Password(ctx context.Context) (string, error)
AcceptTermsOfService(ctx context.Context, tos tg.HelpTermsOfService) error
SignUp(ctx context.Context) (UserInfo, error)
CodeAuthenticator
}
type noSignUp struct{}
func (c noSignUp) SignUp(ctx context.Context) (UserInfo, error) {
return UserInfo{}, xerrors.New("not implemented")
}
func (c noSignUp) AcceptTermsOfService(ctx context.Context, tos tg.HelpTermsOfService) error {
return &SignUpRequired{TermsOfService: tos}
}
type constantAuth struct {
phone, password string
CodeAuthenticator
noSignUp
}
func (c constantAuth) Phone(ctx context.Context) (string, error) {
return c.phone, nil
}
func (c constantAuth) Password(ctx context.Context) (string, error) {
return c.password, nil
}
// ConstantAuth creates UserAuthenticator with constant phone and password.
func ConstantAuth(phone, password string, code CodeAuthenticator) UserAuthenticator {
return constantAuth{
phone: phone,
password: password,
CodeAuthenticator: code,
}
}
type envAuth struct {
prefix string
CodeAuthenticator
noSignUp
}
func (e envAuth) lookup(k string) (string, error) {
env := e.prefix + k
v, ok := os.LookupEnv(env)
if !ok {
return "", xerrors.Errorf("environment variable %q not set", env)
}
return v, nil
}
func (e envAuth) Phone(ctx context.Context) (string, error) {
return e.lookup("PHONE")
}
func (e envAuth) Password(ctx context.Context) (string, error) {
p, err := e.lookup("PASSWORD")
if err != nil {
return "", ErrPasswordNotProvided
}
return p, nil
}
// EnvAuth creates UserAuthenticator which gets phone and password from environment variables.
func EnvAuth(prefix string, code CodeAuthenticator) UserAuthenticator {
return envAuth{
prefix: prefix,
CodeAuthenticator: code,
noSignUp: noSignUp{},
}
}
// ErrPasswordNotProvided means that password requested by Telegram,
// but not provided by user.
var ErrPasswordNotProvided = errors.New("password requested but not provided")
type codeOnlyAuth struct {
phone string
CodeAuthenticator
noSignUp
}
func (c codeOnlyAuth) Phone(ctx context.Context) (string, error) {
return c.phone, nil
}
func (c codeOnlyAuth) Password(ctx context.Context) (string, error) {
return "", ErrPasswordNotProvided
}
// CodeOnlyAuth creates UserAuthenticator with constant phone and no password.
func CodeOnlyAuth(phone string, code CodeAuthenticator) UserAuthenticator {
return codeOnlyAuth{
phone: phone,
CodeAuthenticator: code,
}
}
type testAuth struct {
dc int
phone string
}
func (t testAuth) Phone(ctx context.Context) (string, error) { return t.phone, nil }
func (t testAuth) Password(ctx context.Context) (string, error) { return "", ErrPasswordNotProvided }
func (t testAuth) Code(ctx context.Context, sentCode *tg.AuthSentCode) (string, error) {
type notFlashing interface {
GetLength() int
}
typ, ok := sentCode.Type.(notFlashing)
if !ok {
return "", xerrors.Errorf("unexpected type: %T", sentCode.Type)
}
return strings.Repeat(strconv.Itoa(t.dc), typ.GetLength()), nil
}
func (t testAuth) AcceptTermsOfService(ctx context.Context, tos tg.HelpTermsOfService) error {
return nil
}
func (t testAuth) SignUp(ctx context.Context) (UserInfo, error) {
return UserInfo{
FirstName: "Test",
LastName: "User",
}, nil
}
// TestAuth returns UserAuthenticator that authenticates via testing credentials.
//
// Can be used only with testing server. Will perform sign up if test user is
// not registered.
func TestAuth(randReader io.Reader, dc int) UserAuthenticator {
// 99966XYYYY, X = dc_id, Y = random numbers, code = X repeat 6.
// The n value is from 0000 to 9999.
n, err := crypto.RandInt64n(randReader, 1000)
if err != nil {
panic(err)
}
phone := fmt.Sprintf("99966%d%04d", dc, n)
return testAuth{
dc: dc,
phone: phone,
}
}