Go openssl http api

openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -days 365 -subj "/CN=example.com" -addext "subjectAltName = DNS:example.com,DNS:www.example.com,IP:192.168.1.2"

openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -days 365 -subj "/CN=example.com" -addext "extendedKeyUsage = clientAuth"

package main

import (
    "fmt"
    "io/ioutil"
    "net/http"
    "os"
    "os/exec"

    "github.com/labstack/echo/v4"
)

func main() {
    e := echo.New()

    e.POST("/generate-certificate", func(c echo.Context) error {
        // Generate a self-signed certificate using OpenSSL
        cmd := exec.Command("openssl", "req", "-x509", "-newkey", "rsa:4096", "-keyout", "key.pem", "-out", "cert.pem", "-days", "365", "-subj", "/CN=example.com")
        output, err := cmd.CombinedOutput()
        if err != nil {
            return c.String(http.StatusInternalServerError, fmt.Sprintf("Error generating certificate: %s", err))
        }
        return c.String(http.StatusOK, fmt.Sprintf("Certificate generated successfully:\n%s", output))
    })

    e.GET("/get-certificate/:filename", func(c echo.Context) error {
        // Serve generated certificate files
        filename := c.Param("filename")
        c.Response().Header().Set(echo.HeaderContentType, "application/x-pem-file")
        return c.File(filename)
    })

    e.Start(":8080")
}