buildkite.go

Documentation: github.com/sigstore/cosign/v2/pkg/providers/buildkite

     1  // Copyright 2023 The Sigstore Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package buildkite
    16  
    17  import (
    18  	"context"
    19  	"fmt"
    20  	"net/http"
    21  	"os"
    22  
    23  	"github.com/buildkite/agent/v3/api"
    24  	"github.com/buildkite/agent/v3/logger"
    25  	"github.com/sigstore/cosign/v2/pkg/cosign/env"
    26  	"github.com/sigstore/cosign/v2/pkg/providers"
    27  )
    28  
    29  func init() {
    30  	providers.Register("buildkite-agent", &buildkiteAgent{})
    31  }
    32  
    33  type buildkiteAgent struct{}
    34  
    35  var _ providers.Interface = (*buildkiteAgent)(nil)
    36  
    37  // Enabled implements providers.Interface
    38  func (ba *buildkiteAgent) Enabled(_ context.Context) bool {
    39  	return env.Getenv(env.VariableBuildkiteAgentAccessToken) != ""
    40  }
    41  
    42  // Provide implements providers.Interface
    43  func (ba *buildkiteAgent) Provide(ctx context.Context, audience string) (string, error) {
    44  	agentToken := env.Getenv(env.VariableBuildkiteAgentAccessToken)
    45  	endpoint := env.Getenv(env.VariableBuildkiteAgentEndpoint)
    46  	if endpoint == "" {
    47  		endpoint = "https://agent.buildkite.com/v3"
    48  	}
    49  	jobID := env.Getenv(env.VariableBuildkiteJobID)
    50  	logLevel := env.Getenv(env.VariableBuildkiteAgentLogLevel)
    51  	if logLevel == "" {
    52  		logLevel = "notice"
    53  	}
    54  
    55  	l := logger.NewConsoleLogger(logger.NewTextPrinter(os.Stderr), os.Exit)
    56  	level, err := logger.LevelFromString(logLevel)
    57  	if err != nil {
    58  		return "", err
    59  	}
    60  	l.SetLevel(level)
    61  
    62  	client := api.NewClient(l, api.Config{Token: agentToken, Endpoint: endpoint})
    63  	token, response, err := client.OIDCToken(ctx, &api.OIDCTokenRequest{Audience: audience, Job: jobID})
    64  	if err != nil {
    65  		return "", err
    66  	}
    67  	if response != nil && response.StatusCode != http.StatusOK {
    68  		return "", fmt.Errorf("buildkite agent request failed with status: %s", response.Status)
    69  	}
    70  	return token.Token, nil
    71  }
    72
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