package main

import (
	// "context"
	"log"
	// "time"
    "os"
    "fmt"
    "flag"
    "regexp"
    "bytes"
    "strconv"
    "encoding/json"
    "crypto/tls"
    "net/http"
    "html/template"
    "path/filepath"
 
    "github.com/gorilla/mux"
	"github.com/sethvargo/go-password/password"
)

// {
  // "request_id": "540486b5-80b6-4250-1ba3-ec562984c58c",
  // "lease_id": "",
  // "renewable": false,
  // "lease_duration": 0,
  // "data": {
    // "user": "password"
  // },
  // "wrap_info": null,
  // "warnings": null,
  // "auth": null,
  // "mount_type": "system"
// }
// 

var (
    Debug         bool
    TemplateDir   string
    TemplateFile  string
    ActionAddress string
    VaultAddress  string
    Data          string
    ListenPort    string
    TlsEnable     bool
    TlsCertFile   string
    TlsKeyFile    string
)
type TemplateData struct {
    URL  string
    TEXT string
}
type UnwrappedData struct {
  Rerquest_id string `json: "request_id"`
  Lease_id string `json: "lease_id"`
  Renewable bool `json: "renewable"`
  Lease_daration int `json:"lease_duration"`
  Data map[string]string `json: "data"`
  Wrap_info string `json: "wrap_info"`
  Warnings string `json: "warnings"`
  Auth string `json: "auth"`
  Mount_type string `json: "mount_type"`
  Error string `json: "errors"`
}

func vaultDataWrap(vaultAddr string, vaultToken string, vaultSecretName string) string {

	customTransport := &(*http.DefaultTransport.(*http.Transport))
	customTransport.TLSClientConfig = &tls.Config{InsecureSkipVerify: true}

	client := &http.Client{Transport: customTransport}
	// client := &http.Client{}

	req, _ := http.NewRequest("POST", vaultAddr, nil)
	req.Header.Add("Accept", "application/json")
	req.Header.Add("X-Vault-Token", vaultToken)

	resp, err := client.Do(req)

	if err != nil {
		log.Println("Errored when sending request to the Vault server")
	}

	var result map[string]interface{}
	json.NewDecoder(resp.Body).Decode(&result)
	secret := result["data"].(map[string]interface{})["data"].(map[string]interface{})[vaultSecretName]
    log.Println(result)
	return fmt.Sprint(secret)
}

func vaultDataUnWrap(vaultAddr string, vaultWrapToken string) map[string]string {
    log.Printf("Vault address: %s ", vaultAddr)

	customTransport := &(*http.DefaultTransport.(*http.Transport))
	customTransport.TLSClientConfig = &tls.Config{InsecureSkipVerify: true}

	client := &http.Client{Transport: customTransport}
	// client := &http.Client{}
    log.Println(vaultAddr, vaultWrapToken)
	req, _ := http.NewRequest("POST", vaultAddr, nil)
	req.Header.Add("Accept", "application/json")
	req.Header.Add("X-Vault-Token", vaultWrapToken)

	resp, err := client.Do(req)

	if err != nil {
		log.Println("Errored when sending request to the Vault server", err)
	}

    log.Println(resp)

	var result UnwrappedData
	json.NewDecoder(resp.Body).Decode(&result)
	secret := result.Data
    if Debug {
        log.Println(result)
        log.Println(secret)
    }
    	// fmt.Sprint(secret)
    for v, k := range secret {
        log.Println(k, v)
    }
    return secret
}

func ParseTemplate(templateFileName string, data interface{}) (body string, err error) {
    body = ""
	t, err := template.ParseFiles(templateFileName)
	if err != nil {
		log.Println("Ошибка преобразования html шаблона", templateFileName, err)
		return
	}
	buf := new(bytes.Buffer)
	if err = t.Execute(buf, data); err != nil {
		log.Println("Ошибка преобразования html шаблона", templateFileName, err)
        body = ""
    } else {
	    body = buf.String()
    }
	return
}

func getStaticPage(w http.ResponseWriter, r *http.Request) {
    var (
        templateData TemplateData
    )

    template := filepath.Join(TemplateDir, TemplateFile)
    
    // templateData.UUID = uuid
    templateData.URL = ActionAddress
    
    templateData.TEXT = Data
    
    // templateData.URL = FishingUrl + "/" + arrUsers[i].messageUUID
    if body, err := ParseTemplate(template, templateData); err == nil {
        w.Write([]byte(body))
    }
}

// hvs.CAES - 95
// s.Dj7kZS - 26

func getDataFromHtmlForm(w http.ResponseWriter, r *http.Request) {
    r.ParseForm()
    token := r.FormValue("input_token")
    
    vaultPath := VaultAddress + "/v1/sys/wrapping/unwrap"
    
    Data = ""
    // fmt.Fprintln(w, r.URL.RawQuery)
    // log.Println(w, r.URL.RawQuery)
    if Debug {
        log.Printf("Текст для расшифровки: %s ", token)
        log.Printf("Адрес сервера Hashicorp Vault: %s ", vaultPath)
    }
    // Проверка текста на соответствие шаблону
    re := regexp.MustCompile(`^(hvs|s)\.[\w\-\_]+`)
    if Debug {
	    fmt.Println(re.Match([]byte(token)))
    }
    if token != "" && re.Match([]byte(token)) {
        b := new(bytes.Buffer)
        for key, value := range vaultDataUnWrap(vaultPath, token) {
            fmt.Fprintf(b, "%s: %s\n", key, value)
        }
        Data = b.String()
        if Debug {
            log.Println(Data)
        }
    }
    getStaticPage(w, r)
    // http.Redirect(w, r, "http://"+r.Host, http.StatusMovedPermanently)
}

func genPassword(w http.ResponseWriter, r *http.Request) {
	// params := mux.Vars(r)
	// passLength := params["passLength"]
    Data = ""
    r.ParseForm()
    passLength := r.FormValue("passlength")
    if Debug {
	    log.Printf(r.FormValue("passlength"), passLength)
    }
    if len(passLength) == 0 {
        passLength = "32"
    }
	// w.Write([]byte("Длина пароля " + passLength + "/n"))
	passwordLength, err := strconv.Atoi(passLength)
	if passwordLength > 1024 {
		log.Printf("Oversized password length")
		Data = "Превышена длина пароля"
        getStaticPage(w, r)
		return
	}
	if err != nil {
		log.Println(err)
	}
	res, err := password.Generate(passwordLength, 10, 5, false, true)
	if err != nil {
		log.Println(err)
	}
    if Debug {
	    log.Printf(res)
    }
    Data = res
	// w.Write([]byte(res))
    	getStaticPage(w, r)
}

func genPasswordDefault(w http.ResponseWriter, r *http.Request) {
	res, err := password.Generate(64, 10, 5, false, false)
	if err != nil {
		log.Fatal(err)
	}
	log.Printf(res)
	// w.Write([]byte(res))
    Data = res
	// w.Write([]byte(res))
    	getStaticPage(w, r)
}

func main() {
    var (
        logFile string
    )
    flag.BoolVar(&Debug, "debug", false, "Вывод отладочных сообщений в консоль")
    flag.StringVar(&logFile, "log-file", "vault-unwrap.log", "Путь до лог-файла ")
    flag.StringVar(&TemplateDir, "template-dir", "html-template", "Каталог с шаблонами")
    flag.StringVar(&TemplateFile, "template-file", "index.html", "Файл-шаблон для ВЭБ-странцы")
    flag.StringVar(&VaultAddress, "vault-url", "", "Адрес сервера Hashicorp Vault (https://host.name:8200)")
    flag.StringVar(&ActionAddress, "action-address", "", "Адрес данного сервиса (https://host.name)")
    flag.StringVar(&ListenPort, "listen-port", "8080", "Номер порта сервиса")
    flag.StringVar(&TlsCertFile, "tls-cert", "", "TLS сертификат (файл)")
    flag.StringVar(&TlsKeyFile, "tls-key", "", "TLS ключ (файл)")
    flag.BoolVar(&TlsEnable, "tls", false, "Использовать SSL/TLS")
    
	flag.Parse()

    if os.Getenv("logFile") != "" {
        logFile = os.Getenv("logFile")
    }
    
    fLog, err := os.OpenFile(logFile, os.O_RDWR | os.O_CREATE | os.O_APPEND, 0666)
    if err != nil {
        log.Fatalf("error opening file: %v", err)
    }
    defer fLog.Close()

    if Debug {
        log.SetOutput(os.Stdout)
    } else {
        log.SetOutput(fLog)
    }
    
    if os.Getenv("VAULT_ADDRESS") == "" && VaultAddress == "" {
      log.Println("Send error: make sure environment variables `VAULT_ADDRESS` was set")
    } else if os.Getenv("VAULT_ADDRESS") != "" && VaultAddress == "" {
        VaultAddress = os.Getenv("VAULT_ADDRESS")
    }


    if Debug {
        log.Printf("Адрес сервера Hashicorp Vault: %s ", VaultAddress)
    }

    rtr := mux.NewRouter()
    rtr.HandleFunc("/unwrap", getDataFromHtmlForm)
    rtr.HandleFunc("/genpassword/{passLength:[0-9]+}", genPassword)
    rtr.HandleFunc("/genpassword", genPassword)
    
    rtr.HandleFunc("/", getDataFromHtmlForm)
    rtr.PathPrefix("/").Handler(http.FileServer(http.Dir("./static")))
    
    http.Handle("/", rtr)
    if os.Getenv("LISTEN_PORT") != "" {
        ListenPort = os.Getenv("LISTEN_PORT")
    } else {
        if TlsEnable && ListenPort == ""{
            ListenPort = "8443"
        }
    }
    listenAddr := ":" + ListenPort

    // ActionAddress = "https://" + ActionAddress
    if Debug {
        log.Printf("Адрес сервиса: %s%s ", ActionAddress, listenAddr)
    }

    log.Println("Listening...")
    if TlsEnable {
        log.Fatal(http.ListenAndServeTLS(listenAddr, TlsCertFile, TlsKeyFile, nil))
    } else {
        http.ListenAndServe(listenAddr, nil)
    }
}