347 lines
8.6 KiB
Go
347 lines
8.6 KiB
Go
|
// Package godotenv is a go port of the ruby dotenv library (https://github.com/bkeepers/dotenv)
|
||
|
//
|
||
|
// Examples/readme can be found on the github page at https://github.com/joho/godotenv
|
||
|
//
|
||
|
// The TL;DR is that you make a .env file that looks something like
|
||
|
//
|
||
|
// SOME_ENV_VAR=somevalue
|
||
|
//
|
||
|
// and then in your go code you can call
|
||
|
//
|
||
|
// godotenv.Load()
|
||
|
//
|
||
|
// and all the env vars declared in .env will be available through os.Getenv("SOME_ENV_VAR")
|
||
|
package godotenv
|
||
|
|
||
|
import (
|
||
|
"bufio"
|
||
|
"errors"
|
||
|
"fmt"
|
||
|
"io"
|
||
|
"os"
|
||
|
"os/exec"
|
||
|
"regexp"
|
||
|
"sort"
|
||
|
"strings"
|
||
|
)
|
||
|
|
||
|
const doubleQuoteSpecialChars = "\\\n\r\"!$`"
|
||
|
|
||
|
// Load will read your env file(s) and load them into ENV for this process.
|
||
|
//
|
||
|
// Call this function as close as possible to the start of your program (ideally in main)
|
||
|
//
|
||
|
// If you call Load without any args it will default to loading .env in the current path
|
||
|
//
|
||
|
// You can otherwise tell it which files to load (there can be more than one) like
|
||
|
//
|
||
|
// godotenv.Load("fileone", "filetwo")
|
||
|
//
|
||
|
// It's important to note that it WILL NOT OVERRIDE an env variable that already exists - consider the .env file to set dev vars or sensible defaults
|
||
|
func Load(filenames ...string) (err error) {
|
||
|
filenames = filenamesOrDefault(filenames)
|
||
|
|
||
|
for _, filename := range filenames {
|
||
|
err = loadFile(filename, false)
|
||
|
if err != nil {
|
||
|
return // return early on a spazout
|
||
|
}
|
||
|
}
|
||
|
return
|
||
|
}
|
||
|
|
||
|
// Overload will read your env file(s) and load them into ENV for this process.
|
||
|
//
|
||
|
// Call this function as close as possible to the start of your program (ideally in main)
|
||
|
//
|
||
|
// If you call Overload without any args it will default to loading .env in the current path
|
||
|
//
|
||
|
// You can otherwise tell it which files to load (there can be more than one) like
|
||
|
//
|
||
|
// godotenv.Overload("fileone", "filetwo")
|
||
|
//
|
||
|
// It's important to note this WILL OVERRIDE an env variable that already exists - consider the .env file to forcefilly set all vars.
|
||
|
func Overload(filenames ...string) (err error) {
|
||
|
filenames = filenamesOrDefault(filenames)
|
||
|
|
||
|
for _, filename := range filenames {
|
||
|
err = loadFile(filename, true)
|
||
|
if err != nil {
|
||
|
return // return early on a spazout
|
||
|
}
|
||
|
}
|
||
|
return
|
||
|
}
|
||
|
|
||
|
// Read all env (with same file loading semantics as Load) but return values as
|
||
|
// a map rather than automatically writing values into env
|
||
|
func Read(filenames ...string) (envMap map[string]string, err error) {
|
||
|
filenames = filenamesOrDefault(filenames)
|
||
|
envMap = make(map[string]string)
|
||
|
|
||
|
for _, filename := range filenames {
|
||
|
individualEnvMap, individualErr := readFile(filename)
|
||
|
|
||
|
if individualErr != nil {
|
||
|
err = individualErr
|
||
|
return // return early on a spazout
|
||
|
}
|
||
|
|
||
|
for key, value := range individualEnvMap {
|
||
|
envMap[key] = value
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return
|
||
|
}
|
||
|
|
||
|
// Parse reads an env file from io.Reader, returning a map of keys and values.
|
||
|
func Parse(r io.Reader) (envMap map[string]string, err error) {
|
||
|
envMap = make(map[string]string)
|
||
|
|
||
|
var lines []string
|
||
|
scanner := bufio.NewScanner(r)
|
||
|
for scanner.Scan() {
|
||
|
lines = append(lines, scanner.Text())
|
||
|
}
|
||
|
|
||
|
if err = scanner.Err(); err != nil {
|
||
|
return
|
||
|
}
|
||
|
|
||
|
for _, fullLine := range lines {
|
||
|
if !isIgnoredLine(fullLine) {
|
||
|
var key, value string
|
||
|
key, value, err = parseLine(fullLine, envMap)
|
||
|
|
||
|
if err != nil {
|
||
|
return
|
||
|
}
|
||
|
envMap[key] = value
|
||
|
}
|
||
|
}
|
||
|
return
|
||
|
}
|
||
|
|
||
|
//Unmarshal reads an env file from a string, returning a map of keys and values.
|
||
|
func Unmarshal(str string) (envMap map[string]string, err error) {
|
||
|
return Parse(strings.NewReader(str))
|
||
|
}
|
||
|
|
||
|
// Exec loads env vars from the specified filenames (empty map falls back to default)
|
||
|
// then executes the cmd specified.
|
||
|
//
|
||
|
// Simply hooks up os.Stdin/err/out to the command and calls Run()
|
||
|
//
|
||
|
// If you want more fine grained control over your command it's recommended
|
||
|
// that you use `Load()` or `Read()` and the `os/exec` package yourself.
|
||
|
func Exec(filenames []string, cmd string, cmdArgs []string) error {
|
||
|
Load(filenames...)
|
||
|
|
||
|
command := exec.Command(cmd, cmdArgs...)
|
||
|
command.Stdin = os.Stdin
|
||
|
command.Stdout = os.Stdout
|
||
|
command.Stderr = os.Stderr
|
||
|
return command.Run()
|
||
|
}
|
||
|
|
||
|
// Write serializes the given environment and writes it to a file
|
||
|
func Write(envMap map[string]string, filename string) error {
|
||
|
content, error := Marshal(envMap)
|
||
|
if error != nil {
|
||
|
return error
|
||
|
}
|
||
|
file, error := os.Create(filename)
|
||
|
if error != nil {
|
||
|
return error
|
||
|
}
|
||
|
_, err := file.WriteString(content)
|
||
|
return err
|
||
|
}
|
||
|
|
||
|
// Marshal outputs the given environment as a dotenv-formatted environment file.
|
||
|
// Each line is in the format: KEY="VALUE" where VALUE is backslash-escaped.
|
||
|
func Marshal(envMap map[string]string) (string, error) {
|
||
|
lines := make([]string, 0, len(envMap))
|
||
|
for k, v := range envMap {
|
||
|
lines = append(lines, fmt.Sprintf(`%s="%s"`, k, doubleQuoteEscape(v)))
|
||
|
}
|
||
|
sort.Strings(lines)
|
||
|
return strings.Join(lines, "\n"), nil
|
||
|
}
|
||
|
|
||
|
func filenamesOrDefault(filenames []string) []string {
|
||
|
if len(filenames) == 0 {
|
||
|
return []string{".env"}
|
||
|
}
|
||
|
return filenames
|
||
|
}
|
||
|
|
||
|
func loadFile(filename string, overload bool) error {
|
||
|
envMap, err := readFile(filename)
|
||
|
if err != nil {
|
||
|
return err
|
||
|
}
|
||
|
|
||
|
currentEnv := map[string]bool{}
|
||
|
rawEnv := os.Environ()
|
||
|
for _, rawEnvLine := range rawEnv {
|
||
|
key := strings.Split(rawEnvLine, "=")[0]
|
||
|
currentEnv[key] = true
|
||
|
}
|
||
|
|
||
|
for key, value := range envMap {
|
||
|
if !currentEnv[key] || overload {
|
||
|
os.Setenv(key, value)
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return nil
|
||
|
}
|
||
|
|
||
|
func readFile(filename string) (envMap map[string]string, err error) {
|
||
|
file, err := os.Open(filename)
|
||
|
if err != nil {
|
||
|
return
|
||
|
}
|
||
|
defer file.Close()
|
||
|
|
||
|
return Parse(file)
|
||
|
}
|
||
|
|
||
|
func parseLine(line string, envMap map[string]string) (key string, value string, err error) {
|
||
|
if len(line) == 0 {
|
||
|
err = errors.New("zero length string")
|
||
|
return
|
||
|
}
|
||
|
|
||
|
// ditch the comments (but keep quoted hashes)
|
||
|
if strings.Contains(line, "#") {
|
||
|
segmentsBetweenHashes := strings.Split(line, "#")
|
||
|
quotesAreOpen := false
|
||
|
var segmentsToKeep []string
|
||
|
for _, segment := range segmentsBetweenHashes {
|
||
|
if strings.Count(segment, "\"") == 1 || strings.Count(segment, "'") == 1 {
|
||
|
if quotesAreOpen {
|
||
|
quotesAreOpen = false
|
||
|
segmentsToKeep = append(segmentsToKeep, segment)
|
||
|
} else {
|
||
|
quotesAreOpen = true
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if len(segmentsToKeep) == 0 || quotesAreOpen {
|
||
|
segmentsToKeep = append(segmentsToKeep, segment)
|
||
|
}
|
||
|
}
|
||
|
|
||
|
line = strings.Join(segmentsToKeep, "#")
|
||
|
}
|
||
|
|
||
|
firstEquals := strings.Index(line, "=")
|
||
|
firstColon := strings.Index(line, ":")
|
||
|
splitString := strings.SplitN(line, "=", 2)
|
||
|
if firstColon != -1 && (firstColon < firstEquals || firstEquals == -1) {
|
||
|
//this is a yaml-style line
|
||
|
splitString = strings.SplitN(line, ":", 2)
|
||
|
}
|
||
|
|
||
|
if len(splitString) != 2 {
|
||
|
err = errors.New("Can't separate key from value")
|
||
|
return
|
||
|
}
|
||
|
|
||
|
// Parse the key
|
||
|
key = splitString[0]
|
||
|
if strings.HasPrefix(key, "export") {
|
||
|
key = strings.TrimPrefix(key, "export")
|
||
|
}
|
||
|
key = strings.Trim(key, " ")
|
||
|
|
||
|
// Parse the value
|
||
|
value = parseValue(splitString[1], envMap)
|
||
|
return
|
||
|
}
|
||
|
|
||
|
func parseValue(value string, envMap map[string]string) string {
|
||
|
|
||
|
// trim
|
||
|
value = strings.Trim(value, " ")
|
||
|
|
||
|
// check if we've got quoted values or possible escapes
|
||
|
if len(value) > 1 {
|
||
|
rs := regexp.MustCompile(`\A'(.*)'\z`)
|
||
|
singleQuotes := rs.FindStringSubmatch(value)
|
||
|
|
||
|
rd := regexp.MustCompile(`\A"(.*)"\z`)
|
||
|
doubleQuotes := rd.FindStringSubmatch(value)
|
||
|
|
||
|
if singleQuotes != nil || doubleQuotes != nil {
|
||
|
// pull the quotes off the edges
|
||
|
value = value[1 : len(value)-1]
|
||
|
}
|
||
|
|
||
|
if doubleQuotes != nil {
|
||
|
// expand newlines
|
||
|
escapeRegex := regexp.MustCompile(`\\.`)
|
||
|
value = escapeRegex.ReplaceAllStringFunc(value, func(match string) string {
|
||
|
c := strings.TrimPrefix(match, `\`)
|
||
|
switch c {
|
||
|
case "n":
|
||
|
return "\n"
|
||
|
case "r":
|
||
|
return "\r"
|
||
|
default:
|
||
|
return match
|
||
|
}
|
||
|
})
|
||
|
// unescape characters
|
||
|
e := regexp.MustCompile(`\\([^$])`)
|
||
|
value = e.ReplaceAllString(value, "$1")
|
||
|
}
|
||
|
|
||
|
if singleQuotes == nil {
|
||
|
value = expandVariables(value, envMap)
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return value
|
||
|
}
|
||
|
|
||
|
func expandVariables(v string, m map[string]string) string {
|
||
|
r := regexp.MustCompile(`(\\)?(\$)(\()?\{?([A-Z0-9_]+)?\}?`)
|
||
|
|
||
|
return r.ReplaceAllStringFunc(v, func(s string) string {
|
||
|
submatch := r.FindStringSubmatch(s)
|
||
|
|
||
|
if submatch == nil {
|
||
|
return s
|
||
|
}
|
||
|
if submatch[1] == "\\" || submatch[2] == "(" {
|
||
|
return submatch[0][1:]
|
||
|
} else if submatch[4] != "" {
|
||
|
return m[submatch[4]]
|
||
|
}
|
||
|
return s
|
||
|
})
|
||
|
}
|
||
|
|
||
|
func isIgnoredLine(line string) bool {
|
||
|
trimmedLine := strings.Trim(line, " \n\t")
|
||
|
return len(trimmedLine) == 0 || strings.HasPrefix(trimmedLine, "#")
|
||
|
}
|
||
|
|
||
|
func doubleQuoteEscape(line string) string {
|
||
|
for _, c := range doubleQuoteSpecialChars {
|
||
|
toReplace := "\\" + string(c)
|
||
|
if c == '\n' {
|
||
|
toReplace = `\n`
|
||
|
}
|
||
|
if c == '\r' {
|
||
|
toReplace = `\r`
|
||
|
}
|
||
|
line = strings.Replace(line, string(c), toReplace, -1)
|
||
|
}
|
||
|
return line
|
||
|
}
|