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login_auto.go
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login_auto.go
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package slackauth
import (
"context"
"errors"
"fmt"
"log/slog"
"net/http"
"time"
"github.com/go-rod/rod"
"github.com/go-rod/rod/lib/input"
"github.com/go-rod/rod/lib/launcher"
"github.com/go-rod/rod/lib/proto"
)
const (
idPasswordLogin = `[data-qa="sign_in_password_link"]`
idPassword = "#password"
idEmail = "#email"
idAnyError = `[data-qa-error="true"]`
idPasswordError = "#password_error"
idSignInAlertText = ".c-inline_alert__text"
idRedirect = `[data-qa="ssb_redirect_open_in_browser"]`
idUnknownBrowser = `#enter_code_app_root`
idDigitN = `[aria-label="digit %d of 6"]`
debugDelay = 1 * time.Second
)
// Headless logs the user in headlessly, without opening the browser UI. It
// is only suitable for user/email login method, as it does not require any
// additional user interaction.
func Headless(ctx context.Context, workspace, email, password string, opt ...Option) (string, []*http.Cookie, error) {
wspURL, err := workspaceURL(workspace)
if err != nil {
return "", nil, err
}
if err := checkWorkspaceURL(wspURL); err != nil {
return "", nil, err
}
var opts options = options{
codeFn: SimpleChallengeFn,
lg: slog.Default(),
}
opts.apply(opt)
isHeadless := !opts.debug
l := launcher.New().
Leakless(isLeaklessEnabled). // Causes false positive on Windows, see #260
Headless(isHeadless).
Devtools(false)
url, err := l.Context(ctx).Launch()
if err != nil {
return "", nil, ErrBrowser{Err: err, FailedTo: "launch"}
}
defer l.Cleanup()
var delay time.Duration = 0
if opts.debug {
delay = debugDelay
}
var browser = rod.New().
Context(ctx).
ControlURL(url).
Trace(opts.debug).
SlowMotion(delay)
defer browser.Close()
if err := browser.Connect(); err != nil {
return "", nil, ErrBrowser{Err: err, FailedTo: "connect"}
}
defer browser.Close()
if err := setCookies(browser, opts.cookies); err != nil {
return "", nil, err
}
page, err := browser.Page(proto.TargetCreateTarget{URL: wspURL})
if err != nil {
return "", nil, ErrBrowser{Err: err, FailedTo: "open page"}
}
h := newHijacker(page, opts.lg)
defer h.Stop()
// if there's no password element on the page, we must be on the "email
// login" page. We need to switch away to the password login.
if has, _, err := page.Has(idPassword); err != nil {
return "", nil, ErrBrowser{Err: err, FailedTo: "check for password field"}
} else if !has {
opts.lg.Debug("switching to password login")
el, err := page.Element(idPasswordLogin)
if err != nil {
return "", nil, ErrBrowser{Err: err, FailedTo: "find password login link"}
}
if err := el.Click(proto.InputMouseButtonLeft, 1); err != nil {
return "", nil, ErrBrowser{Err: err, FailedTo: "click password login link"}
}
}
// fill in email and password fields.
if fldEmail, err := page.Element(idEmail); err != nil {
return "", nil, ErrBrowser{Err: err, FailedTo: "find email field"}
} else {
if err := fldEmail.Input(email); err != nil {
return "", nil, ErrBrowser{Err: err, FailedTo: "fill in email field"}
}
}
if fldPwd, err := page.Element(idPassword); err != nil {
return "", nil, ErrBrowser{Err: err, FailedTo: "find password field"}
} else {
if err := fldPwd.Input(password); err != nil {
return "", nil, ErrBrowser{Err: err, FailedTo: "fill in password field"}
}
if err := fldPwd.Type(input.Enter); err != nil {
return "", nil, ErrBrowser{Err: err, FailedTo: "submit login form"}
}
}
rctx := page.Race().Element(idAnyError).Handle(func(e *rod.Element) error {
opts.lg.Debug("looks like some error occurred")
if has, _, err := page.Has(idPasswordError); err == nil && has {
el, err := page.Element(idSignInAlertText)
if err != nil {
return ErrInvalidCredentials
}
txt, err := el.Text()
if err != nil {
return ErrInvalidCredentials
}
return fmt.Errorf("%w, slack message: [%s]", ErrInvalidCredentials, txt)
}
return ErrLoginError
}).Element(idUnknownBrowser).Handle(func(e *rod.Element) error {
opts.lg.Debug("looks like we're on the unknown browser page")
code, err := opts.codeFn(email)
if err != nil {
return fmt.Errorf("failed to get challenge code: %w", err)
}
if err := enterCode(page, code); err != nil {
return ErrBrowser{Err: err, FailedTo: "enter challenge code"}
}
return nil
}).Element(idRedirect) // success
if _, err := rctx.Do(); err != nil {
return "", nil, ErrBrowser{Err: err, FailedTo: "wait for login to complete"}
}
ctx, cancel := context.WithTimeoutCause(ctx, 30*time.Second, errors.New("login timeout"))
defer cancel()
ctx, cancelCause := withTabGuard(ctx, browser, page.TargetID, opts.lg)
defer cancelCause(nil)
token, err := h.Token(ctx)
if err != nil {
return "", nil, err
}
cookies, err := extractCookies(browser)
if err != nil {
return "", nil, ErrBrowser{Err: err, FailedTo: "extract cookies"}
}
return token, cookies, nil
}
// SimpleChallengeFn is a simple challenge function that reads a single
// integer from stdin. It is used as a default challenge function when
// none is provided.
func SimpleChallengeFn(email string) (int, error) {
var code int
fmt.Printf("Slack has sent you an email message with a challenge code to your %s address.\nPlease open your email and type the code from the message.\n\nEnter code: ", email)
_, err := fmt.Scanf("%d", &code)
if err != nil {
return 0, err
}
return code, nil
}
func enterCode(page *rod.Page, code int) error {
sCode := fmt.Sprintf("%06d", code)
for i := 1; i <= 6; i++ {
id := fmt.Sprintf(idDigitN, i)
el, err := page.Element(id)
if err != nil {
return ErrBrowser{Err: err, FailedTo: "find digit input field"}
}
if err := el.Input(string(sCode[i])); err != nil {
return ErrBrowser{Err: err, FailedTo: "fill in digit input field"}
}
}
return nil
}