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//
// Copyright 2021 The Sigstore Authors.
//
// 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 github
import (
"context"
"encoding/json"
"fmt"
"net/http"
"os"
"strings"
"time"
"github.com/sigstore/cosign/v2/pkg/cosign/env"
"github.com/sigstore/cosign/v2/pkg/providers"
)
const (
// Deprecated: use `env.VariableGitHubRequestToken` instead
RequestTokenEnvKey = env.VariableGitHubRequestToken
// Deprecated: use `env.VariableGitHubRequestURL` instead
RequestURLEnvKey = env.VariableGitHubRequestURL
)
func init() {
providers.Register("github-actions", &githubActions{})
}
type githubActions struct{}
var _ providers.Interface = (*githubActions)(nil)
// Enabled implements providers.Interface
func (ga *githubActions) Enabled(_ context.Context) bool {
if env.Getenv(env.VariableGitHubRequestToken) == "" {
return false
}
if env.Getenv(env.VariableGitHubRequestURL) == "" {
return false
}
return true
}
// Provide implements providers.Interface
func (ga *githubActions) Provide(ctx context.Context, audience string) (string, error) {
url := env.Getenv(env.VariableGitHubRequestURL) + "&audience=" + audience
req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
if err != nil {
return "", err
}
// May be replaced by a different client if we hit HTTP_1_1_REQUIRED.
client := http.DefaultClient
// Retry up to 3 times.
for i := 0; ; i++ {
req.Header.Add("Authorization", "bearer "+env.Getenv(env.VariableGitHubRequestToken))
resp, err := client.Do(req)
if err != nil {
if i == 2 {
return "", err
}
// This error isn't exposed by net/http, and retrying this with the
// DefaultClient will fail because it will just use HTTP2 again.
// I don't know why go doesn't do this for us.
if strings.Contains(err.Error(), "HTTP_1_1_REQUIRED") {
http1transport := http.DefaultTransport.(*http.Transport).Clone()
http1transport.ForceAttemptHTTP2 = false
client = &http.Client{
Transport: http1transport,
}
}
fmt.Fprintf(os.Stderr, "error fetching GitHub OIDC token (will retry): %v\n", err)
time.Sleep(time.Second)
continue
}
defer resp.Body.Close()
var payload struct {
Value string `json:"value"`
}
decoder := json.NewDecoder(resp.Body)
if err := decoder.Decode(&payload); err != nil {
return "", err
}
return payload.Value, nil
}
}
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