67 lines
1.6 KiB
Go
67 lines
1.6 KiB
Go
// Copyright 2025 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package oauthex implements extensions to OAuth2.
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package oauthex
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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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"strings"
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)
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// prependToPath prepends pre to the path of urlStr.
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// When pre is the well-known path, this is the algorithm specified in both RFC 9728
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// section 3.1 and RFC 8414 section 3.1.
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func prependToPath(urlStr, pre string) (string, error) {
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u, err := url.Parse(urlStr)
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if err != nil {
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return "", err
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}
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p := "/" + strings.Trim(pre, "/")
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if u.Path != "" {
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p += "/"
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}
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u.Path = p + strings.TrimLeft(u.Path, "/")
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return u.String(), nil
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}
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// getJSON retrieves JSON and unmarshals JSON from the URL, as specified in both
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// RFC 9728 and RFC 8414.
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// It will not read more than limit bytes from the body.
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func getJSON[T any](ctx context.Context, c *http.Client, url string, limit int64) (*T, error) {
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
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if err != nil {
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return nil, err
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}
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if c == nil {
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c = http.DefaultClient
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}
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res, err := c.Do(req)
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if err != nil {
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return nil, err
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}
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defer res.Body.Close()
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// Specs require a 200.
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if res.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("bad status %s", res.Status)
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}
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// Specs require application/json.
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if ct := res.Header.Get("Content-Type"); ct != "application/json" {
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return nil, fmt.Errorf("bad content type %q", ct)
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}
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var t T
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dec := json.NewDecoder(io.LimitReader(res.Body, limit))
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if err := dec.Decode(&t); err != nil {
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return nil, err
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}
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return &t, nil
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}
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