| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package envx |
| 4 | |
| 5 | import ( |
| 6 | "fmt" |
| 7 | "os" |
| 8 | "regexp" |
| 9 | "strings" |
| 10 | ) |
| 11 | |
| 12 | var reEnvVarID = regexp.MustCompile(`^[A-Za-z_][A-Za-z0-9_]*$`) |
| 13 | |
| 14 | func Lookup(name string) (string, bool) { |
| 15 | v, ok := os.LookupEnv(name) |
| 16 | if !ok { |
| 17 | return "", false |
| 18 | } |
| 19 | return strings.TrimSpace(v), true |
| 20 | } |
| 21 | |
| 22 | func ResolveRequired(selector, fieldPath string) (string, error) { |
| 23 | selector = strings.TrimSpace(selector) |
| 24 | if selector == "" { |
| 25 | return "", fmt.Errorf("%s selector is empty", fieldPath) |
| 26 | } |
| 27 | val, ok := Lookup(selector) |
| 28 | if !ok || strings.TrimSpace(val) == "" { |
| 29 | return "", fmt.Errorf("%s references env '%s' which is not set", fieldPath, selector) |
| 30 | } |
| 31 | return strings.TrimSpace(val), nil |
| 32 | } |
| 33 | |
| 34 | func ResolveOptional(selector string) (string, bool) { |
| 35 | selector = strings.TrimSpace(selector) |
| 36 | if selector == "" { |
| 37 | return "", false |
| 38 | } |
| 39 | val, ok := Lookup(selector) |
| 40 | if !ok || strings.TrimSpace(val) == "" { |
| 41 | return "", false |
| 42 | } |
| 43 | return strings.TrimSpace(val), true |
| 44 | } |
| 45 | |
| 46 | func ValidateSelector(name, fieldPath string) error { |
| 47 | name = strings.TrimSpace(name) |
| 48 | if name == "" { |
| 49 | return fmt.Errorf("%s is required", fieldPath) |
| 50 | } |
| 51 | if !reEnvVarID.MatchString(name) { |
| 52 | return fmt.Errorf("%s must reference an environment variable name", fieldPath) |
| 53 | } |
| 54 | return nil |
| 55 | } |
| 56 | |
| 57 | func ParseBool(name string) bool { |
| 58 | v, ok := Lookup(name) |
| 59 | if !ok { |
| 60 | return false |
| 61 | } |
| 62 | switch strings.ToLower(strings.TrimSpace(v)) { |
| 63 | case "1", "true", "yes": |
| 64 | return true |
| 65 | default: |
| 66 | return false |
| 67 | } |
| 68 | } |