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hijacker.go
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hijacker.go
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package slackauth
import (
"context"
"fmt"
"net/http"
"github.com/go-rod/rod"
"github.com/go-rod/rod/lib/proto"
)
// hijacker is a helper for hijacking requests.
type hijacker struct {
r *rod.HijackRouter
credsC chan creds
lg Logger
}
type creds struct {
Token string
Err error
}
func newHijacker(page *rod.Page, lg Logger) *hijacker {
var (
r = page.HijackRequests()
credsC = make(chan creds, 1)
hj = &hijacker{r: r, credsC: credsC, lg: lg}
)
r.MustAdd(`*/api/api.features*`, func(h *rod.Hijack) {
lg.Debug("hijack api.features")
r := h.Request.Req()
token, err := extractToken(r)
if err != nil {
credsC <- creds{Err: fmt.Errorf("error parsing token out of request: %v", err)}
return
}
credsC <- creds{Token: token}
})
go r.Run()
return hj
}
func (h *hijacker) Stop() error {
if err := h.r.Stop(); err != nil {
return err
}
close(h.credsC)
return nil
}
// Token waits for the hijacker to receive a token or an error.
func (h *hijacker) Token(ctx context.Context) (string, error) {
select {
case <-ctx.Done():
return "", context.Cause(ctx)
case creds := <-h.credsC:
return creds.Token, creds.Err
}
}
func setCookies(browser *rod.Browser, cookies []*http.Cookie) error {
if len(cookies) == 0 {
return nil
}
for _, c := range cookies {
if err := browser.SetCookies([]*proto.NetworkCookieParam{
{Name: c.Name, Value: c.Value, Domain: c.Domain, Path: c.Path, Expires: proto.TimeSinceEpoch(c.Expires.Unix())},
}); err != nil {
return fmt.Errorf("failed to set cookies: %w", err)
}
}
return nil
}
const (
maxMem = 131072
paramToken = "token"
)
func extractToken(r *http.Request) (string, error) {
if err := r.ParseMultipartForm(maxMem); err != nil {
return "", err
}
return r.Form.Get(paramToken), nil
}