Password Generator using Go and K3s

#go #k3s

package main

import (
    "crypto/rand"
    "encoding/json"
    "fmt"
    "net/http"
    "strconv"
)

const letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
const numbers = "0123456789"
const symbols = "!@#$%^&*()_+-="

func generatePassword(length int, useNumbers bool, useSymbols bool) (string, error) {
    charset := letters
    if useNumbers {
        charset += numbers
    }
    if useSymbols {
        charset += symbols
    }

    bytes := make([]byte, length)
    _, err := rand.Read(bytes)
    if err != nil {
        return "", err
    }

    for i := range bytes {
        bytes[i] = charset[int(bytes[i])%len(charset)]
    }
    return string(bytes), nil
}

func passwordHandler(w http.ResponseWriter, r *http.Request) {
    length, _ := strconv.Atoi(r.URL.Query().Get("length"))
    if length <= 0 {
        length = 12
    }

    useNumbers := r.URL.Query().Get("numbers") == "true"
    useSymbols := r.URL.Query().Get("symbols") == "true"

    password, err := generatePassword(length, useNumbers, useSymbols)
    if err != nil {
        http.Error(w, "Failed to generate password", 500)
        return
    }

    response := map[string]string{
        "password": password,
    }

    w.Header().Set("Content-Type", "application/json")
    json.NewEncoder(w).Encode(response)
}

func main() {
    http.HandleFunc("/api/password/generate", passwordHandler)

    fmt.Println("Server running on :8080")
    http.ListenAndServe(":8080", nil)
}

How to use

Run : go run main.go
Server running on :8080
Access: http://localhost:8080/api/password/generate http://localhost:8080/api/password/generate?length=20&numbers=true&symbols=true