mirror of
https://github.com/opencloud-eu/opencloud.git
synced 2025-12-31 18:19:32 -05:00
89 lines
2.4 KiB
Go
89 lines
2.4 KiB
Go
/*
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* Copyright 2019 Kopano
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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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"fmt"
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"io"
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"net/http"
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"net/url"
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"time"
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"github.com/pquerna/cachecontrol"
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)
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// Basic HTTP related global settings.
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var (
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DefaultHTTPClient *http.Client
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DefaultHTTPHeader http.Header
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DefaultMaxJSONFetchSize int64 = 5 * 1024 * 1024 // 5 MiB
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DefaultJSONFetchExpiry = time.Minute * 1
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DefaultJSONFetchRetry = time.Second * 3
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)
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func fetchJSON(ctx context.Context, u *url.URL, dst interface{}, client *http.Client, header http.Header) (time.Duration, error) {
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if client == nil {
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client = DefaultHTTPClient
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if client == nil {
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client = http.DefaultClient
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}
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}
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req, err := http.NewRequest(http.MethodGet, u.String(), nil)
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if err != nil {
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return DefaultJSONFetchRetry, fmt.Errorf("failed create fetch JSON request: %v", err)
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}
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if header == nil {
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header = DefaultHTTPHeader
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}
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if header != nil {
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for h, values := range header {
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for _, v := range values {
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req.Header.Add(h, v)
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}
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}
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}
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res, err := client.Do(req.WithContext(ctx))
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if err != nil {
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return DefaultJSONFetchRetry, fmt.Errorf("failed to fetch JSON: %v", err)
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}
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defer res.Body.Close()
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if res.StatusCode != http.StatusOK {
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return DefaultJSONFetchRetry, fmt.Errorf("failed to fetch JSON (status: %d)", res.StatusCode)
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}
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_, expires, _ := cachecontrol.CachableResponse(req, res, cachecontrol.Options{})
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err = json.NewDecoder(io.LimitReader(res.Body, DefaultMaxJSONFetchSize)).Decode(dst)
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if err != nil {
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return DefaultJSONFetchRetry, fmt.Errorf("failed to fetch JSON: %v", err)
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}
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expirationDuration := expires.Sub(time.Now())
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if expirationDuration < DefaultJSONFetchRetry {
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if err == nil {
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expirationDuration = DefaultJSONFetchExpiry
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} else {
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expirationDuration = DefaultJSONFetchRetry
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}
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}
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return expirationDuration, err
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}
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