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package env
import (
"errors"
"fmt"
"os"
"strconv"
"strings"
"time"
"github.com/go-acme/lego/v4/log"
)
// Get environment variables.
func Get(names ...string) (map[string]string, error) {
values := map[string]string{}
var missingEnvVars []string
for _, envVar := range names {
value := GetOrFile(envVar)
if value == "" {
missingEnvVars = append(missingEnvVars, envVar)
}
values[envVar] = value
}
if len(missingEnvVars) > 0 {
return nil, fmt.Errorf("some credentials information are missing: %s", strings.Join(missingEnvVars, ","))
}
return values, nil
}
// GetWithFallback Get environment variable values.
// The first name in each group is use as key in the result map.
//
// case 1:
//
// // LEGO_ONE="ONE"
// // LEGO_TWO="TWO"
// env.GetWithFallback([]string{"LEGO_ONE", "LEGO_TWO"})
// // => "LEGO_ONE" = "ONE"
//
// case 2:
//
// // LEGO_ONE=""
// // LEGO_TWO="TWO"
// env.GetWithFallback([]string{"LEGO_ONE", "LEGO_TWO"})
// // => "LEGO_ONE" = "TWO"
//
// case 3:
//
// // LEGO_ONE=""
// // LEGO_TWO=""
// env.GetWithFallback([]string{"LEGO_ONE", "LEGO_TWO"})
// // => error
func GetWithFallback(groups ...[]string) (map[string]string, error) {
values := map[string]string{}
var missingEnvVars []string
for _, names := range groups {
if len(names) == 0 {
return nil, errors.New("undefined environment variable names")
}
value, envVar := getOneWithFallback(names[0], names[1:]...)
if value == "" {
missingEnvVars = append(missingEnvVars, envVar)
continue
}
values[envVar] = value
}
if len(missingEnvVars) > 0 {
return nil, fmt.Errorf("some credentials information are missing: %s", strings.Join(missingEnvVars, ","))
}
return values, nil
}
func getOneWithFallback(main string, names ...string) (string, string) {
value := GetOrFile(main)
if len(value) > 0 {
return value, main
}
for _, name := range names {
value := GetOrFile(name)
if len(value) > 0 {
return value, main
}
}
return "", main
}
// GetOrDefaultInt returns the given environment variable value as an integer.
// Returns the default if the envvar cannot be coopered to an int, or is not found.
func GetOrDefaultInt(envVar string, defaultValue int) int {
v, err := strconv.Atoi(GetOrFile(envVar))
if err != nil {
return defaultValue
}
return v
}
// GetOrDefaultSecond returns the given environment variable value as an time.Duration (second).
// Returns the default if the envvar cannot be coopered to an int, or is not found.
func GetOrDefaultSecond(envVar string, defaultValue time.Duration) time.Duration {
v := GetOrDefaultInt(envVar, -1)
if v < 0 {
return defaultValue
}
return time.Duration(v) * time.Second
}
// GetOrDefaultString returns the given environment variable value as a string.
// Returns the default if the envvar cannot be find.
func GetOrDefaultString(envVar, defaultValue string) string {
v := GetOrFile(envVar)
if v == "" {
return defaultValue
}
return v
}
// GetOrDefaultBool returns the given environment variable value as a boolean.
// Returns the default if the envvar cannot be coopered to a boolean, or is not found.
func GetOrDefaultBool(envVar string, defaultValue bool) bool {
v, err := strconv.ParseBool(GetOrFile(envVar))
if err != nil {
return defaultValue
}
return v
}
// GetOrFile Attempts to resolve 'key' as an environment variable.
// Failing that, it will check to see if '<key>_FILE' exists.
// If so, it will attempt to read from the referenced file to populate a value.
func GetOrFile(envVar string) string {
envVarValue := os.Getenv(envVar)
if envVarValue != "" {
return envVarValue
}
fileVar := envVar + "_FILE"
fileVarValue := os.Getenv(fileVar)
if fileVarValue == "" {
return envVarValue
}
fileContents, err := os.ReadFile(fileVarValue)
if err != nil {
log.Printf("Failed to read the file %s (defined by env var %s): %s", fileVarValue, fileVar, err)
return ""
}
return strings.TrimSuffix(string(fileContents), "\n")
}
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