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viettranx/vnpay_payment_url.go

Created August 15, 2021 08:31
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  1. viettranx created this gist Aug 15, 2021.
    75 changes: 75 additions & 0 deletions vnpay_payment_url.go
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,75 @@
    package payment

    import (
    "crypto/sha256"
    "encoding/hex"
    "net/http"
    "sort"
    "strings"
    "time"
    )

    type Payment struct {
    OrderInfo string `json:"order_info"`
    Amount string `json:"amount"`
    BankCode string `json:"bank_code"`
    OrderType string `json:"order_type"`
    VnpUrl string
    ReturnUrl string
    IpAddr string
    SecretKey string
    TmnCode string
    }

    func (pay Payment) GeneratePaymentUrl() string {
    currentDate := time.Now()

    m := map[string]string{}

    m["vnp_Version"] = "2"
    m["vnp_Command"] = "pay"
    m["vnp_TmnCode"] = pay.TmnCode
    m["vnp_Amount"] = pay.Amount + "00"
    m["vnp_CreateDate"] = currentDate.Format("20060102150405")
    m["vnp_CurrCode"] = "VND"
    m["vnp_IpAddr"] = pay.IpAddr
    m["vnp_Locale"] = "vn"
    m["vnp_OrderInfo"] = pay.OrderInfo
    m["vnp_OrderType"] = pay.OrderType
    m["vnp_ReturnUrl"] = pay.ReturnUrl
    m["vnp_TxnRef"] = currentDate.Format("150405")
    m["vnp_BankCode"] = pay.BankCode
    m["vnp_ExpireDate"] = currentDate.Format("20060102150405")

    req, _ := http.NewRequest("GET", pay.VnpUrl, nil)
    q := req.URL.Query()

    for key := range m {
    q.Add(key, m[key])
    }
    keys := []string{}
    for k := range q {
    keys = append(keys, k)
    }
    sort.Strings(keys)
    qData := ""
    for _, key := range keys {
    qData += key + "=" + strings.Join(q[key], "") + "&"
    }

    signData := pay.SecretKey + qData

    lengSignData := len(signData)
    signData = signData[:lengSignData-1]

    hash := sha256.New()
    hash.Write([]byte(signData))
    hashed := hex.EncodeToString(hash.Sum(nil))

    q.Add("vnp_SecureHashType", "SHA256")
    q.Add("vnp_SecureHash", hashed)

    req.URL.RawQuery = q.Encode()

    return req.URL.String()
    }