oidc-demo-app/handlers/oidc_callback.go

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/*
Copyright 2020, 2021 Jan Dittberner
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 handlers
import (
"context"
"net/http"
"github.com/go-openapi/runtime/client"
"github.com/lestrrat-go/jwx/jwk"
log "github.com/sirupsen/logrus"
"golang.org/x/oauth2"
"git.cacert.org/oidc_demo_app/services"
)
const (
sessionKeyAccessToken = iota
sessionKeyRefreshToken
sessionKeyIdToken
sessionRedirectTarget
)
type oidcCallbackHandler struct {
keySet jwk.Set
logger *log.Logger
oauth2Config *oauth2.Config
}
func (c *oidcCallbackHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodGet {
w.WriteHeader(http.StatusMethodNotAllowed)
return
}
if r.URL.Path != "/callback" {
http.NotFound(w, r)
return
}
errorText := r.URL.Query().Get("error")
errorDescription := r.URL.Query().Get("error_description")
if errorText != "" {
errorDetails := &ErrorDetails{
ErrorMessage: errorText,
}
if errorDescription != "" {
errorDetails.ErrorDetails = []string{errorDescription}
}
GetErrorBucket(r).AddError(errorDetails)
return
}
code := r.URL.Query().Get("code")
ctx := context.Background()
httpClient, err := client.TLSClient(client.TLSClientOptions{InsecureSkipVerify: true})
ctx = context.WithValue(ctx, oauth2.HTTPClient, httpClient)
tok, err := c.oauth2Config.Exchange(ctx, code)
if err != nil {
c.logger.Error(err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
session, err := services.GetSessionStore().Get(r, "resource_session")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
session.Values[sessionKeyAccessToken] = tok.AccessToken
session.Values[sessionKeyRefreshToken] = tok.RefreshToken
idToken := tok.Extra("id_token").(string)
session.Values[sessionKeyIdToken] = idToken
if oidcToken, err := ParseIdToken(idToken, c.keySet); err != nil {
c.logger.Error(err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
} else {
c.logger.Debugf(`
ID Token
========
Subject: %s
Audience: %s
Issued at: %s
Issued by: %s
Not valid before: %s
Not valid after: %s
`,
oidcToken.Subject(),
oidcToken.Audience(),
oidcToken.IssuedAt(),
oidcToken.Issuer(),
oidcToken.NotBefore(),
oidcToken.Expiration(),
)
}
if err = session.Save(r, w); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
if redirectTarget, ok := session.Values[sessionRedirectTarget]; ok {
w.Header().Set("Location", redirectTarget.(string))
} else {
w.Header().Set("Location", "/")
}
w.WriteHeader(http.StatusFound)
}
func NewCallbackHandler(ctx context.Context, logger *log.Logger) *oidcCallbackHandler {
return &oidcCallbackHandler{
keySet: services.GetJwkSet(ctx),
logger: logger,
oauth2Config: services.GetOAuth2Config(ctx),
}
}