mirror of https://github.com/knative/pkg.git
101 lines
2.9 KiB
Go
101 lines
2.9 KiB
Go
// Copyright 2022 Google LLC.
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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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// https://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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// Package util provides helper functions for the client.
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package util
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import (
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"encoding/json"
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"errors"
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"io"
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"os"
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"os/user"
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"path/filepath"
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"runtime"
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"strings"
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)
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const configFileName = "certificate_config.json"
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// EnterpriseCertificateConfig contains parameters for initializing signer.
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type EnterpriseCertificateConfig struct {
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Libs Libs `json:"libs"`
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}
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// Libs specifies the locations of helper libraries.
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type Libs struct {
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ECP string `json:"ecp"`
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}
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// ErrConfigUnavailable is a sentinel error that indicates ECP config is unavailable,
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// possibly due to entire config missing or missing binary path.
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var ErrConfigUnavailable = errors.New("Config is unavailable")
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// LoadSignerBinaryPath retrieves the path of the signer binary from the config file.
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func LoadSignerBinaryPath(configFilePath string) (path string, err error) {
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jsonFile, err := os.Open(configFilePath)
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if err != nil {
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if errors.Is(err, os.ErrNotExist) {
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return "", ErrConfigUnavailable
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}
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return "", err
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}
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byteValue, err := io.ReadAll(jsonFile)
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if err != nil {
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return "", err
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}
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var config EnterpriseCertificateConfig
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err = json.Unmarshal(byteValue, &config)
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if err != nil {
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return "", err
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}
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signerBinaryPath := config.Libs.ECP
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if signerBinaryPath == "" {
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return "", ErrConfigUnavailable
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}
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signerBinaryPath = strings.ReplaceAll(signerBinaryPath, "~", guessHomeDir())
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signerBinaryPath = strings.ReplaceAll(signerBinaryPath, "$HOME", guessHomeDir())
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return signerBinaryPath, nil
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}
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func guessHomeDir() string {
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// Prefer $HOME over user.Current due to glibc bug: golang.org/issue/13470
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if v := os.Getenv("HOME"); v != "" {
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return v
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}
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// Else, fall back to user.Current:
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if u, err := user.Current(); err == nil {
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return u.HomeDir
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}
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return ""
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}
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func getDefaultConfigFileDirectory() (directory string) {
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if runtime.GOOS == "windows" {
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return filepath.Join(os.Getenv("APPDATA"), "gcloud")
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}
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return filepath.Join(guessHomeDir(), ".config/gcloud")
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}
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// GetDefaultConfigFilePath returns the default path of the enterprise certificate config file created by gCloud.
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func GetDefaultConfigFilePath() (path string) {
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return filepath.Join(getDefaultConfigFileDirectory(), configFileName)
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}
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// GetConfigFilePathFromEnv returns the path associated with environment variable GOOGLE_API_CERTIFICATE_CONFIG
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func GetConfigFilePathFromEnv() (path string) {
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return os.Getenv("GOOGLE_API_CERTIFICATE_CONFIG")
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}
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