/
callback.go
153 lines (138 loc) · 4.67 KB
/
callback.go
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// Copyright © 2019 The Things Network Foundation, The Things Industries B.V.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package oauthclient
import (
"context"
stderrors "errors"
"net/http"
"go.thethings.network/lorawan-stack/v3/pkg/errors"
"go.thethings.network/lorawan-stack/v3/pkg/webhandlers"
"golang.org/x/oauth2"
)
var (
errRefused = errors.DefinePermissionDenied("refused", "refused by OAuth server", "reason")
errNoStateParam = errors.DefinePermissionDenied("no_state_param", "no state parameter present in request")
errNoStateCookie = errors.DefinePermissionDenied("no_state_cookie", "no state cookie stored")
errNoCodeParam = errors.DefinePermissionDenied("no_code", "no code parameter present in request")
errInvalidState = errors.DefinePermissionDenied("invalid_state", "invalid state parameter")
errExchange = errors.DefinePermissionDenied("exchange", "token exchange refused")
)
type oauthAuthorizeResponse struct {
Error string `schema:"error"`
ErrorDescription string `schema:"error_description"`
State string `schema:"state"`
Code string `schema:"code"`
}
func (res *oauthAuthorizeResponse) ValidateContext(c context.Context) error {
if res.Error != "" {
return errRefused.WithAttributes("reason", res.ErrorDescription)
}
if res.State == "" {
return errNoStateParam.New()
}
if res.Code == "" {
return errNoCodeParam.New()
}
return nil
}
var errParse = errors.DefineAborted("parse", "request body parsing")
// HandleCallback is a handler that takes the auth code and exchanges it for the
// access token.
func (oc *OAuthClient) HandleCallback(w http.ResponseWriter, r *http.Request) {
var response oauthAuthorizeResponse
if err := r.ParseForm(); err != nil {
webhandlers.Error(w, r, errParse.WithCause(err))
return
}
if err := oc.schemaDecoder.Decode(&response, r.Form); err != nil {
webhandlers.Error(w, r, errParse.WithCause(err))
return
}
if err := response.ValidateContext(r.Context()); err != nil {
webhandlers.Error(w, r, err)
return
}
stateCookie, err := oc.getStateCookie(w, r)
value, acErr := oc.getAuthCookie(w, r)
if err != nil {
// Running the callback without state cookie often occurs when re-running
// the callback after successful token exchange (e.g. using the browser's
// back button after logging in). If there is a valid auth cookie, we just
// redirect back to the client mount instead of showing an error.
if acErr != nil {
webhandlers.Error(w, r, errNoStateCookie.WithCause(acErr))
return
}
if value.AccessToken != "" {
config := oc.configFromContext(r.Context())
http.Redirect(w, r, config.RootURL, http.StatusFound)
return
}
webhandlers.Error(w, r, err)
return
}
if stateCookie.Secret != response.State {
webhandlers.Error(w, r, errInvalidState.New())
return
}
// Exchange token.
ctx, err := oc.withHTTPClient(r.Context())
if err != nil {
webhandlers.Error(w, r, err)
return
}
conf, err := oc.oauthConfig(r.Context())
if err != nil {
webhandlers.Error(w, r, err)
return
}
token, err := conf.Exchange(ctx, response.Code)
if err != nil {
var retrieveError *oauth2.RetrieveError
if stderrors.As(err, &retrieveError) {
var ttnErr errors.Error
if decErr := ttnErr.UnmarshalJSON(retrieveError.Body); decErr == nil {
webhandlers.Error(w, r, errExchange.WithCause(&ttnErr))
return
}
}
webhandlers.Error(w, r, errExchange.WithCause(err))
return
}
oc.removeStateCookie(w, r)
err = oc.setAuthCookie(w, r, authCookie{
AccessToken: token.AccessToken,
RefreshToken: token.RefreshToken,
Expiry: token.Expiry,
})
if err != nil {
webhandlers.Error(w, r, err)
return
}
if err := oc.callback(w, r, token, stateCookie.Next); err != nil {
if _, ok := errors.From(err); !ok {
err = errExchange.WithCause(err)
}
webhandlers.Error(w, r, err)
return
}
}
func (oc *OAuthClient) defaultCallback(w http.ResponseWriter, r *http.Request, _ *oauth2.Token, next string) error {
config := oc.configFromContext(r.Context())
http.Redirect(w, r, config.RootURL+next, http.StatusFound)
return nil
}
func (oc *OAuthClient) defaultAuthCodeURLOptions(ctx context.Context) ([]oauth2.AuthCodeOption, error) {
return nil, nil
}