peridot/vendor/cloud.google.com/go/auth/internal/credsfile/credsfile.go

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// Copyright 2023 Google LLC
//
// 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 credsfile is meant to hide implementation details from the pubic
// surface of the detect package. It should not import any other packages in
// this module. It is located under the main internal package so other
// sub-packages can use these parsed types as well.
package credsfile
import (
"os"
"os/user"
"path/filepath"
"runtime"
)
const (
// GoogleAppCredsEnvVar is the environment variable for setting the
// application default credentials.
GoogleAppCredsEnvVar = "GOOGLE_APPLICATION_CREDENTIALS"
userCredsFilename = "application_default_credentials.json"
)
// CredentialType represents different credential filetypes Google credentials
// can be.
type CredentialType int
const (
// UnknownCredType is an unidentified file type.
UnknownCredType CredentialType = iota
// UserCredentialsKey represents a user creds file type.
UserCredentialsKey
// ServiceAccountKey represents a service account file type.
ServiceAccountKey
// ImpersonatedServiceAccountKey represents a impersonated service account
// file type.
ImpersonatedServiceAccountKey
// ExternalAccountKey represents a external account file type.
ExternalAccountKey
// GDCHServiceAccountKey represents a GDCH file type.
GDCHServiceAccountKey
// ExternalAccountAuthorizedUserKey represents a external account authorized
// user file type.
ExternalAccountAuthorizedUserKey
)
// parseCredentialType returns the associated filetype based on the parsed
// typeString provided.
func parseCredentialType(typeString string) CredentialType {
switch typeString {
case "service_account":
return ServiceAccountKey
case "authorized_user":
return UserCredentialsKey
case "impersonated_service_account":
return ImpersonatedServiceAccountKey
case "external_account":
return ExternalAccountKey
case "external_account_authorized_user":
return ExternalAccountAuthorizedUserKey
case "gdch_service_account":
return GDCHServiceAccountKey
default:
return UnknownCredType
}
}
// GetFileNameFromEnv returns the override if provided or detects a filename
// from the environment.
func GetFileNameFromEnv(override string) string {
if override != "" {
return override
}
return os.Getenv(GoogleAppCredsEnvVar)
}
// GetWellKnownFileName tries to locate the filepath for the user credential
// file based on the environment.
func GetWellKnownFileName() string {
if runtime.GOOS == "windows" {
return filepath.Join(os.Getenv("APPDATA"), "gcloud", userCredsFilename)
}
return filepath.Join(guessUnixHomeDir(), ".config", "gcloud", userCredsFilename)
}
// guessUnixHomeDir default to checking for HOME, but not all unix systems have
// this set, do have a fallback.
func guessUnixHomeDir() string {
if v := os.Getenv("HOME"); v != "" {
return v
}
if u, err := user.Current(); err == nil {
return u.HomeDir
}
return ""
}