65 lines
1.9 KiB
Go
65 lines
1.9 KiB
Go
package metarefresh
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import (
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"crypto/subtle"
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"fmt"
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"log/slog"
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"net/http"
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"time"
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"git.sad.ovh/sophie/nuke"
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"git.sad.ovh/sophie/nuke/lib/challenge"
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"git.sad.ovh/sophie/nuke/lib/localization"
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"github.com/a-h/templ"
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)
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//go:generate go tool github.com/a-h/templ/cmd/templ generate
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func init() {
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challenge.Register("metarefresh", &Impl{})
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}
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type Impl struct{}
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func (i *Impl) Setup(mux *http.ServeMux) {}
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func (i *Impl) Issue(w http.ResponseWriter, r *http.Request, lg *slog.Logger, in *challenge.IssueInput) (templ.Component, error) {
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u, err := r.URL.Parse(nuke.BasePrefix + "/.within.website/x/cmd/nuke/api/pass-challenge")
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if err != nil {
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return nil, fmt.Errorf("can't render page: %w", err)
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}
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q := u.Query()
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q.Set("redir", r.URL.String())
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q.Set("challenge", in.Challenge.RandomData)
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q.Set("id", in.Challenge.ID)
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u.RawQuery = q.Encode()
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showMeta := in.Challenge.RandomData[0]%2 == 0
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if !showMeta {
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w.Header().Add("Refresh", fmt.Sprintf("%d; url=%s", in.Rule.Challenge.Difficulty+1, u.String()))
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}
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loc := localization.GetLocalizer(r)
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result := page(u.String(), in.Rule.Challenge.Difficulty, showMeta, loc)
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return result, nil
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}
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func (i *Impl) Validate(r *http.Request, lg *slog.Logger, in *challenge.ValidateInput) error {
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wantTime := in.Challenge.IssuedAt.Add(time.Duration(in.Rule.Challenge.Difficulty) * 800 * time.Millisecond)
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if time.Now().Before(wantTime) {
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return challenge.NewError("validate", "insufficient time", fmt.Errorf("%w: wanted user to wait until at least %s", challenge.ErrFailed, wantTime.Format(time.RFC3339)))
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}
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gotChallenge := r.FormValue("challenge")
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if subtle.ConstantTimeCompare([]byte(in.Challenge.RandomData), []byte(gotChallenge)) != 1 {
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return challenge.NewError("validate", "invalid response", fmt.Errorf("%w: wanted response %s but got %s", challenge.ErrFailed, in.Challenge.RandomData, gotChallenge))
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}
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return nil
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}
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