egutierrez
ebf246beb0
- dotenv_load: parser .env con no-sobreescritura y soporte de comillas - env_require: os.Getenv con error descriptivo fail-fast - env_require_all: verifica multiples vars y lista todas las faltantes - config_from_env: reflection sobre struct tags env/default/required/secret, 5 tipos soportados - config_from_file: JSON via stdlib, YAML stub con not-implemented - 25 tests unitarios, todos PASS Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
74 lines
1.8 KiB
Go
74 lines
1.8 KiB
Go
package infra
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import (
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"bufio"
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"fmt"
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"os"
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"strings"
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)
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// DotenvLoad parses a .env file and sets environment variables via os.Setenv.
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// It does NOT overwrite variables that are already set in the environment.
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//
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// Parsing rules:
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// - Lines starting with # (after trimming) are ignored as comments.
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// - Blank lines are ignored.
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// - Lines must follow the KEY=VALUE format.
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// - Values may be optionally quoted with single or double quotes; quotes are stripped.
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// - Inline comments (# after value) are NOT stripped — the raw value after = is used.
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//
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// Returns an error if the file cannot be opened or if a line has no '=' separator.
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func DotenvLoad(path string) error {
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f, err := os.Open(path)
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if err != nil {
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return fmt.Errorf("dotenv_load: open %q: %w", path, err)
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}
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defer f.Close()
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scanner := bufio.NewScanner(f)
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lineNum := 0
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for scanner.Scan() {
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lineNum++
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line := strings.TrimSpace(scanner.Text())
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// skip blank lines and comments
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if line == "" || strings.HasPrefix(line, "#") {
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continue
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}
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idx := strings.IndexByte(line, '=')
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if idx < 0 {
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return fmt.Errorf("dotenv_load: %q line %d: missing '=' in %q", path, lineNum, line)
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}
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key := strings.TrimSpace(line[:idx])
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val := line[idx+1:]
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// strip surrounding quotes from value
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val = stripQuotes(val)
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// only set if not already present
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if os.Getenv(key) == "" {
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if err := os.Setenv(key, val); err != nil {
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return fmt.Errorf("dotenv_load: setenv %q: %w", key, err)
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}
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}
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}
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if err := scanner.Err(); err != nil {
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return fmt.Errorf("dotenv_load: scan %q: %w", path, err)
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}
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return nil
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}
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// stripQuotes removes surrounding single or double quotes from a string.
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func stripQuotes(s string) string {
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if len(s) >= 2 {
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if (s[0] == '"' && s[len(s)-1] == '"') ||
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(s[0] == '\'' && s[len(s)-1] == '\'') {
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return s[1 : len(s)-1]
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}
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}
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return s
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}
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