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tokenprovider.go
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tokenprovider.go
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//
// Copyright (c) 2019 Intel Corporation
//
// 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.
//
// SPDX-License-Identifier: Apache-2.0'
//
package secretstore
import (
"context"
"fmt"
"os/exec"
"strings"
"syscall"
"github.com/edgexfoundry/edgex-go/internal/security/secretstoreclient"
"github.com/edgexfoundry/go-mod-core-contracts/clients/logger"
)
const OneShotProvider = "oneshot"
type TokenProvider struct {
loggingClient logger.LoggingClient
ctx context.Context
execRunner ExecRunner
initialized bool
config secretstoreclient.SecretServiceInfo
resolvedPath string
}
// NewTokenProvider creates a new TokenProvider
func NewTokenProvider(ctx context.Context, lc logger.LoggingClient, execRunner ExecRunner) *TokenProvider {
return &TokenProvider{
loggingClient: lc,
ctx: ctx,
execRunner: execRunner,
}
}
// SetConfiguration parses token provider configuration and resolves paths specified therein
func (p *TokenProvider) SetConfiguration(config secretstoreclient.SecretServiceInfo) error {
var err error
p.config = config
if p.config.TokenProviderType != OneShotProvider {
err := fmt.Errorf("%s is not a supported TokenProviderType", p.config.TokenProviderType)
p.loggingClient.Error(err.Error())
return err
}
resolvedPath, err := p.execRunner.LookPath(p.config.TokenProvider)
if err != nil {
p.loggingClient.Error(fmt.Sprintf("Failed to locate %s on PATH: %s", p.config.TokenProvider, err.Error()))
return err
}
p.initialized = true
p.resolvedPath = resolvedPath
return nil
}
// Launch spawns the token provider function
func (p *TokenProvider) Launch() error {
if !p.initialized {
err := fmt.Errorf("TokenProvider object not initialized; call SetConfiguration() first")
return err
}
p.loggingClient.Info(fmt.Sprintf("Launching token provider %s with arguments %s", p.resolvedPath, strings.Join(p.config.TokenProviderArgs, " ")))
cmd := p.execRunner.CommandContext(p.ctx, p.resolvedPath, p.config.TokenProviderArgs...)
if err := cmd.Start(); err != nil {
// For example, this might occur if a shared library was missing
p.loggingClient.Error(fmt.Sprintf("%s failed to launch: %s", p.resolvedPath, err.Error()))
return err
}
err := cmd.Wait()
if exitError, ok := err.(*exec.ExitError); ok {
waitStatus := exitError.Sys().(syscall.WaitStatus)
p.loggingClient.Error(fmt.Sprintf("%s terminated with non-zero exit code %d", p.resolvedPath, waitStatus.ExitStatus()))
return err
}
if err != nil {
p.loggingClient.Error(fmt.Sprintf("%s failed with unexpected error: %s", p.resolvedPath, err.Error()))
return err
}
p.loggingClient.Info("token provider exited successfully")
return nil
}