61 lines
1.6 KiB
Go
61 lines
1.6 KiB
Go
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/*
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Copyright 2025 Peter Kurfer.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package oidc
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import (
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"net/http"
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"strings"
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)
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var ErrUnexpectedStatusCode = errors.New("unexpected status code")
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type DiscoveryDocument struct {
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AuthorizationEndpoint string `json:"authorization_endpoint"`
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TokenEndpoint string `json:"token_endpoint"`
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}
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func IssuerConfiguration(ctx context.Context, issuerUrl string) (dd DiscoveryDocument, err error) {
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const oidcDiscoveryEndpoint = "/.well-known/openid-configuration"
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if !strings.HasSuffix(issuerUrl, oidcDiscoveryEndpoint) {
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issuerUrl = strings.TrimSuffix(issuerUrl, "/") + oidcDiscoveryEndpoint
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}
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, issuerUrl, nil)
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if err != nil {
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return dd, err
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}
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return dd, err
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}
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defer func() {
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err = errors.Join(err, resp.Body.Close())
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}()
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if resp.StatusCode != http.StatusOK {
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return dd, fmt.Errorf("%w: %d - %s", ErrUnexpectedStatusCode, resp.StatusCode, resp.Status)
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}
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return dd, json.NewDecoder(resp.Body).Decode(&dd)
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}
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