164 lines
3.9 KiB
Go
164 lines
3.9 KiB
Go
package env
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import (
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"errors"
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"fmt"
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"io/ioutil"
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"os"
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"strconv"
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"strings"
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"time"
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"github.com/go-acme/lego/v3/log"
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)
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// Get environment variables.
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func Get(names ...string) (map[string]string, error) {
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values := map[string]string{}
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var missingEnvVars []string
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for _, envVar := range names {
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value := GetOrFile(envVar)
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if value == "" {
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missingEnvVars = append(missingEnvVars, envVar)
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}
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values[envVar] = value
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}
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if len(missingEnvVars) > 0 {
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return nil, fmt.Errorf("some credentials information are missing: %s", strings.Join(missingEnvVars, ","))
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}
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return values, nil
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}
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// GetWithFallback Get environment variable values
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// The first name in each group is use as key in the result map
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//
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// // LEGO_ONE="ONE"
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// // LEGO_TWO="TWO"
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// env.GetWithFallback([]string{"LEGO_ONE", "LEGO_TWO"})
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// // => "LEGO_ONE" = "ONE"
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//
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// ----
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//
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// // LEGO_ONE=""
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// // LEGO_TWO="TWO"
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// env.GetWithFallback([]string{"LEGO_ONE", "LEGO_TWO"})
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// // => "LEGO_ONE" = "TWO"
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//
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// ----
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//
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// // LEGO_ONE=""
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// // LEGO_TWO=""
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// env.GetWithFallback([]string{"LEGO_ONE", "LEGO_TWO"})
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// // => error
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//
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func GetWithFallback(groups ...[]string) (map[string]string, error) {
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values := map[string]string{}
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var missingEnvVars []string
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for _, names := range groups {
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if len(names) == 0 {
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return nil, errors.New("undefined environment variable names")
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}
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value, envVar := getOneWithFallback(names[0], names[1:]...)
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if len(value) == 0 {
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missingEnvVars = append(missingEnvVars, envVar)
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continue
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}
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values[envVar] = value
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}
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if len(missingEnvVars) > 0 {
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return nil, fmt.Errorf("some credentials information are missing: %s", strings.Join(missingEnvVars, ","))
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}
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return values, nil
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}
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func getOneWithFallback(main string, names ...string) (string, string) {
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value := GetOrFile(main)
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if len(value) > 0 {
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return value, main
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}
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for _, name := range names {
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value := GetOrFile(name)
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if len(value) > 0 {
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return value, main
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}
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}
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return "", main
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}
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// GetOrDefaultInt returns the given environment variable value as an integer.
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// Returns the default if the envvar cannot be coopered to an int, or is not found.
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func GetOrDefaultInt(envVar string, defaultValue int) int {
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v, err := strconv.Atoi(GetOrFile(envVar))
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if err != nil {
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return defaultValue
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}
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return v
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}
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// GetOrDefaultSecond returns the given environment variable value as an time.Duration (second).
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// Returns the default if the envvar cannot be coopered to an int, or is not found.
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func GetOrDefaultSecond(envVar string, defaultValue time.Duration) time.Duration {
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v := GetOrDefaultInt(envVar, -1)
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if v < 0 {
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return defaultValue
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}
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return time.Duration(v) * time.Second
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}
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// GetOrDefaultString returns the given environment variable value as a string.
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// Returns the default if the envvar cannot be find.
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func GetOrDefaultString(envVar string, defaultValue string) string {
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v := GetOrFile(envVar)
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if len(v) == 0 {
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return defaultValue
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}
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return v
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}
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// GetOrDefaultBool returns the given environment variable value as a boolean.
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// Returns the default if the envvar cannot be coopered to a boolean, or is not found.
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func GetOrDefaultBool(envVar string, defaultValue bool) bool {
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v, err := strconv.ParseBool(GetOrFile(envVar))
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if err != nil {
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return defaultValue
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}
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return v
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}
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// GetOrFile Attempts to resolve 'key' as an environment variable.
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// Failing that, it will check to see if '<key>_FILE' exists.
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// If so, it will attempt to read from the referenced file to populate a value.
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func GetOrFile(envVar string) string {
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envVarValue := os.Getenv(envVar)
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if envVarValue != "" {
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return envVarValue
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}
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fileVar := envVar + "_FILE"
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fileVarValue := os.Getenv(fileVar)
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if fileVarValue == "" {
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return envVarValue
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}
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fileContents, err := ioutil.ReadFile(fileVarValue)
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if err != nil {
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log.Printf("Failed to read the file %s (defined by env var %s): %s", fileVarValue, fileVar, err)
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return ""
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}
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return strings.TrimSuffix(string(fileContents), "\n")
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}
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