mirror of
https://github.com/wneessen/apg-go.git
synced 2024-09-19 03:12:47 +02:00
Split up functions into seperate files
This commit is contained in:
parent
3a87ae7829
commit
eb221ccc69
GPG key ID:
385AC9889632126E
5 changed files with 181 additions and 97 deletions
2
Makefile
2
Makefile
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@ -83,7 +83,7 @@ clean: # @HELP removes built binaries and temporary files
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clean: bin-clean
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bin-clean:
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rm -rf .go bin
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rm -rf .go bin *.exe
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help: # @HELP prints this message
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help:
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102
apg.go
102
apg.go
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@ -1,17 +1,14 @@
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package main
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import (
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"crypto/rand"
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"flag"
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"fmt"
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"math/big"
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"os"
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"regexp"
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)
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// Constants
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const DefaultPwLenght int = 20
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const VersionString string = "0.2.3"
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const VersionString string = "0.2.4"
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const PwLowerCharsHuman string = "abcdefghjkmnpqrstuvwxyz"
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const PwUpperCharsHuman string = "ABCDEFGHJKMNPQRSTUVWXYZ"
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const PwLowerChars string = "abcdefghijklmnopqrstuvwxyz"
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@ -32,6 +29,7 @@ type cliOpts struct {
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useSpecial bool
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humanReadable bool
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excludeChars string
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newStyleModes string
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showHelp bool
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showVersion bool
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}
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@ -56,6 +54,8 @@ func init() {
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// String flags
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flag.StringVar(&config.excludeChars, "E", "", "Exclude list of characters from generated password")
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flag.StringVar(&config.newStyleModes, "M", "",
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"New style password parameters (higher priority than single parameters)")
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flag.Parse()
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if config.showVersion {
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@ -66,21 +66,8 @@ func init() {
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// Main function that generated the passwords and returns them
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func main() {
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pwLength := config.minPassLen
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if pwLength < config.minPassLen {
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pwLength = config.minPassLen
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}
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if pwLength > config.maxPassLen {
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pwLength = config.maxPassLen
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}
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if config.useComplex {
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config.useUpperCase = true
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config.useLowerCase = true
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config.useSpecial = true
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config.useNumber = true
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config.humanReadable = false
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}
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parseParams()
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pwLength := getPwLengthFromParams()
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charRange := getCharRange()
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for i := 1; i <= config.numOfPass; i++ {
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@ -92,80 +79,3 @@ func main() {
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fmt.Println(pwString)
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}
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}
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// Provide the range of available characters based on provided parameters
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func getCharRange() string {
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pwUpperChars := PwUpperChars
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pwLowerChars := PwLowerChars
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pwNumbers := PwNumbers
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pwSpecialChars := PwSpecialChars
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if config.humanReadable {
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pwUpperChars = PwUpperCharsHuman
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pwLowerChars = PwLowerCharsHuman
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pwNumbers = PwNumbersHuman
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pwSpecialChars = PwSpecialCharsHuman
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}
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var charRange string
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if config.useLowerCase {
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charRange = charRange + pwLowerChars
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}
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if config.useUpperCase {
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charRange = charRange + pwUpperChars
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}
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if config.useNumber {
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charRange = charRange + pwNumbers
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}
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if config.useSpecial {
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charRange = charRange + pwSpecialChars
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}
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if config.excludeChars != "" {
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regExp := regexp.MustCompile("[" + config.excludeChars + "]")
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charRange = regExp.ReplaceAllLiteralString(charRange, "")
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}
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return charRange
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}
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// Generate random characters based on given character range
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// and password length
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func getRandChar(charRange *string, pwLength int) (string, error) {
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if pwLength <= 0 {
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err := fmt.Errorf("provided pwLength value is <= 0: %v", pwLength)
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return "", err
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}
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availCharsLength := len(*charRange)
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charSlice := []byte(*charRange)
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returnString := make([]byte, pwLength)
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for i := 0; i < pwLength; i++ {
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randNum, err := getRandNum(availCharsLength)
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if err != nil {
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return "", err
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}
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returnString[i] = charSlice[randNum]
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}
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return string(returnString), nil
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}
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// Generate a random number with given maximum value
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func getRandNum(maxNum int) (int, error) {
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if maxNum <= 0 {
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err := fmt.Errorf("provided maxNum is <= 0: %v", maxNum)
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return 0, err
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}
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maxNumBigInt := big.NewInt(int64(maxNum))
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if !maxNumBigInt.IsUint64() {
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err := fmt.Errorf("big.NewInt() generation returned negative value: %v", maxNumBigInt)
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return 0, err
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}
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randNum64, err := rand.Int(rand.Reader, maxNumBigInt)
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if err != nil {
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return 0, err
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}
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randNum := int(randNum64.Int64())
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if randNum < 0 {
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err := fmt.Errorf("generated random number does not fit as int64: %v", randNum64)
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return 0, err
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}
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return randNum, nil
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}
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37
chars.go
Normal file
37
chars.go
Normal file
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@ -0,0 +1,37 @@
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package main
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import "regexp"
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// Provide the range of available characters based on provided parameters
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func getCharRange() string {
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pwUpperChars := PwUpperChars
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pwLowerChars := PwLowerChars
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pwNumbers := PwNumbers
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pwSpecialChars := PwSpecialChars
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if config.humanReadable {
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pwUpperChars = PwUpperCharsHuman
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pwLowerChars = PwLowerCharsHuman
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pwNumbers = PwNumbersHuman
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pwSpecialChars = PwSpecialCharsHuman
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}
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var charRange string
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if config.useLowerCase {
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charRange = charRange + pwLowerChars
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}
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if config.useUpperCase {
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charRange = charRange + pwUpperChars
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}
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if config.useNumber {
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charRange = charRange + pwNumbers
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}
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if config.useSpecial {
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charRange = charRange + pwSpecialChars
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}
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if config.excludeChars != "" {
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regExp := regexp.MustCompile("[" + config.excludeChars + "]")
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charRange = regExp.ReplaceAllLiteralString(charRange, "")
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}
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return charRange
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}
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87
params.go
Normal file
87
params.go
Normal file
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@ -0,0 +1,87 @@
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package main
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import (
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"fmt"
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"os"
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)
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// Parse the new style parameters
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func parseNewStyleParams() {
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for _, curParam := range config.newStyleModes {
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switch curParam {
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case 'S':
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config.useSpecial = true
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break
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case 's':
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config.useSpecial = false
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break
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case 'N':
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config.useNumber = true
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break
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case 'n':
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config.useNumber = false
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break
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case 'L':
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config.useLowerCase = true
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break
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case 'l':
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config.useLowerCase = false
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break
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case 'U':
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config.useUpperCase = true
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break
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case 'u':
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config.useUpperCase = false
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break
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case 'H':
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config.humanReadable = true
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break
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case 'h':
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config.humanReadable = false
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break
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// APG compatbilitly
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case 'C':
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config.useUpperCase = true
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break
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case 'c':
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config.useUpperCase = false
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break
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default:
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fmt.Printf("Unknown password style parameter: %q\n", string(curParam))
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os.Exit(1)
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}
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}
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}
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func getPwLengthFromParams() int {
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pwLength := config.minPassLen
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if pwLength < config.minPassLen {
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pwLength = config.minPassLen
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}
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if pwLength > config.maxPassLen {
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pwLength = config.maxPassLen
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}
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return pwLength
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}
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func parseParams() {
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if config.useComplex {
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config.useUpperCase = true
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config.useLowerCase = true
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config.useSpecial = true
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config.useNumber = true
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config.humanReadable = false
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}
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if config.newStyleModes != "" {
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parseNewStyleParams()
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}
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if config.useUpperCase == false &&
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config.useLowerCase == false &&
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config.useNumber == false &&
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config.useSpecial == false {
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fmt.Printf("No password mode set. Cannot generate password from empty character set.")
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os.Exit(1)
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}
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}
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50
rand.go
Normal file
50
rand.go
Normal file
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@ -0,0 +1,50 @@
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package main
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import (
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"crypto/rand"
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"fmt"
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"math/big"
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)
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// Generate random characters based on given character range
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// and password length
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func getRandChar(charRange *string, pwLength int) (string, error) {
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if pwLength <= 0 {
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err := fmt.Errorf("provided pwLength value is <= 0: %v", pwLength)
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return "", err
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}
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availCharsLength := len(*charRange)
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charSlice := []byte(*charRange)
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returnString := make([]byte, pwLength)
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for i := 0; i < pwLength; i++ {
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randNum, err := getRandNum(availCharsLength)
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if err != nil {
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return "", err
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}
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returnString[i] = charSlice[randNum]
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}
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return string(returnString), nil
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}
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// Generate a random number with given maximum value
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func getRandNum(maxNum int) (int, error) {
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if maxNum <= 0 {
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err := fmt.Errorf("provided maxNum is <= 0: %v", maxNum)
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return 0, err
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}
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maxNumBigInt := big.NewInt(int64(maxNum))
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if !maxNumBigInt.IsUint64() {
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err := fmt.Errorf("big.NewInt() generation returned negative value: %v", maxNumBigInt)
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return 0, err
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}
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randNum64, err := rand.Int(rand.Reader, maxNumBigInt)
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if err != nil {
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return 0, err
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}
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randNum := int(randNum64.Int64())
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if randNum < 0 {
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err := fmt.Errorf("generated random number does not fit as int64: %v", randNum64)
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return 0, err
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}
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return randNum, nil
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}
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