This repository has been archived on 2022-07-28. You can view files and clone it, but cannot push or open issues or pull requests.
hydra_oidc_poc/common/services/oidc.go

134 lines
3.6 KiB
Go
Raw Normal View History

/*
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.
*/
2020-12-31 13:19:21 +01:00
package services
import (
"bytes"
"context"
2020-12-31 13:19:21 +01:00
"encoding/json"
"net/http"
"net/url"
"github.com/lestrrat-go/jwx/jwk"
2020-12-31 13:19:21 +01:00
log "github.com/sirupsen/logrus"
"golang.org/x/oauth2"
"git.cacert.org/oidc_login/common/models"
)
type oidcContextKey int
// context keys
const (
ctxOidcConfig oidcContextKey = iota
ctxOAuth2Config
ctxOidcJwks
2020-12-31 13:19:21 +01:00
)
// Parameters for DiscoverOIDC
type OidcParams struct {
OidcServer string
OidcClientId string
OidcClientSecret string
APIClient *http.Client
}
// Discover OpenID Connect parameters from the discovery endpoint and the
// JSON Web Key Set from the discovered jwksUri.
//
// The subset of values specified by models.OpenIDConfiguration is stored in
// the given context and can be retrieved from the context by GetOidcConfig.
//
// OAuth2 specific values are stored in another context object and can be
// retrieved by GetOAuth2Config.
//
// The JSON Web Key Set can be retrieved by GetJwkSet.
func DiscoverOIDC(ctx context.Context, logger *log.Logger, params *OidcParams) (context.Context, error) {
2020-12-31 13:19:21 +01:00
var discoveryUrl *url.URL
discoveryUrl, err := url.Parse(params.OidcServer)
if err != nil {
logger.Fatalf("could not parse oidc.server parameter value %s: %s", params.OidcServer, err)
2020-12-31 13:19:21 +01:00
} else {
discoveryUrl.Path = "/.well-known/openid-configuration"
}
var body []byte
var req *http.Request
req, err = http.NewRequest(http.MethodGet, discoveryUrl.String(), bytes.NewBuffer(body))
if err != nil {
return nil, err
2020-12-31 13:19:21 +01:00
}
req.Header = map[string][]string{
"Accept": {"application/json"},
}
resp, err := params.APIClient.Do(req)
2020-12-31 13:19:21 +01:00
if err != nil {
return nil, err
2020-12-31 13:19:21 +01:00
}
dec := json.NewDecoder(resp.Body)
discoveryResponse := &models.OpenIDConfiguration{}
err = dec.Decode(discoveryResponse)
2020-12-31 13:19:21 +01:00
if err != nil {
return nil, err
}
ctx = context.WithValue(ctx, ctxOidcConfig, discoveryResponse)
oauth2Config := &oauth2.Config{
ClientID: params.OidcClientId,
ClientSecret: params.OidcClientSecret,
Endpoint: oauth2.Endpoint{
AuthURL: discoveryResponse.AuthorizationEndpoint,
TokenURL: discoveryResponse.TokenEndpoint,
},
Scopes: []string{"openid", "offline"},
2020-12-31 13:19:21 +01:00
}
ctx = context.WithValue(ctx, ctxOAuth2Config, oauth2Config)
keySet, err := jwk.FetchHTTP(discoveryResponse.JwksUri, jwk.WithHTTPClient(params.APIClient))
if err != nil {
log.Fatalf("could not fetch JWKs: %s", err)
}
ctx = context.WithValue(ctx, ctxOidcJwks, keySet)
return ctx, nil
}
// Get the OpenID configuration from the context.
//
// DiscoverOIDC needs to be called before this is available.
func GetOidcConfig(ctx context.Context) *models.OpenIDConfiguration {
return ctx.Value(ctxOidcConfig).(*models.OpenIDConfiguration)
}
// Get the OAuth 2 configuration configuration from the context.
//
// DiscoverOIDC needs to be called before this is available.
func GetOAuth2Config(ctx context.Context) *oauth2.Config {
return ctx.Value(ctxOAuth2Config).(*oauth2.Config)
}
2020-12-31 13:19:21 +01:00
// Get the JSON Web Key set from the context.
//
// DiscoverOIDC needs to be called before this is available.
func GetJwkSet(ctx context.Context) *jwk.Set {
return ctx.Value(ctxOidcJwks).(*jwk.Set)
2020-12-31 13:19:21 +01:00
}