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cmd: Enhance .env (dotenv) file parsing

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Basic support for quoted values, newlines in quoted values, and comments.

Does not support variable or command expansion.
This commit is contained in:
Matthew Holt 2022-04-13 11:35:28 -06:00
parent bc15b4b0e7
commit 30b6d1f47a
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GPG key ID: 2A349DD577D586A5
2 changed files with 212 additions and 16 deletions
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58
cmd/main.go
View file

@ -368,42 +368,68 @@ func loadEnvFromFile(envFile string) error {
return nil
}
// parseEnvFile parses an env file from KEY=VALUE format.
// It's pretty naive. Limited value quotation is supported,
// but variable and command expansions are not supported.
func parseEnvFile(envInput io.Reader) (map[string]string, error) {
envMap := make(map[string]string)
scanner := bufio.NewScanner(envInput)
var line string
lineNumber := 0
var lineNumber int
for scanner.Scan() {
line = strings.TrimSpace(scanner.Text())
line := strings.TrimSpace(scanner.Text())
lineNumber++
// skip lines starting with comment
if strings.HasPrefix(line, "#") {
continue
}
// skip empty line
if len(line) == 0 {
// skip empty lines and lines starting with comment
if line == "" || strings.HasPrefix(line, "#") {
continue
}
// split line into key and value
fields := strings.SplitN(line, "=", 2)
if len(fields) != 2 {
return nil, fmt.Errorf("can't parse line %d; line should be in KEY=VALUE format", lineNumber)
}
key, val := fields[0], fields[1]
if strings.Contains(fields[0], " ") {
return nil, fmt.Errorf("bad key on line %d: contains whitespace", lineNumber)
}
key := fields[0]
val := fields[1]
// sometimes keys are prefixed by "export " so file can be sourced in bash; ignore it here
key = strings.TrimPrefix(key, "export ")
// validate key and value
if key == "" {
return nil, fmt.Errorf("missing or empty key on line %d", lineNumber)
}
if strings.Contains(key, " ") {
return nil, fmt.Errorf("invalid key on line %d: contains whitespace: %s", lineNumber, key)
}
if strings.HasPrefix(val, " ") || strings.HasPrefix(val, "\t") {
return nil, fmt.Errorf("invalid value on line %d: whitespace before value: '%s'", lineNumber, val)
}
// remove any trailing comment after value
if commentStart := strings.Index(val, "#"); commentStart > 0 {
before := val[commentStart-1]
if before == '\t' || before == ' ' {
val = strings.TrimRight(val[:commentStart], " \t")
}
}
// quoted value: support newlines
if strings.HasPrefix(val, `"`) {
for !(strings.HasSuffix(line, `"`) && !strings.HasSuffix(line, `\"`)) {
val = strings.ReplaceAll(val, `\"`, `"`)
if !scanner.Scan() {
break
}
lineNumber++
line = strings.ReplaceAll(scanner.Text(), `\"`, `"`)
val += "\n" + line
}
val = strings.TrimPrefix(val, `"`)
val = strings.TrimSuffix(val, `"`)
}
envMap[key] = val
}