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gorobokassa.go
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gorobokassa.go
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package gorobokassa
import (
"crypto/md5"
"errors"
"fmt"
"io"
"log"
"net/http"
"net/url"
"strconv"
"strings"
)
const (
queryOutSumm = "OutSum"
queryInvID = "InvId"
queryCRC = "SignatureValue"
queryDescription = "Desc"
queryLogin = "MrchLogin"
robokassaHost = "auth.robokassa.ru"
// robokassaHost = "test.robokassa.ru"
robokassaPath = "Merchant/Index.aspx"
// robokassaPath = "Index.aspx"
scheme = "https"
// scheme = "http"
delim = ":"
)
var (
ErrBadRequest = errors.New("bad request")
)
// Client для генерации URL и проверки уведомлений
type Client struct {
login string
firstPassword string
secondPassword string
}
// URL переадресации пользователя на оплату
func (client *Client) URL(invoice, value int, description string) string {
return buildRedirectURL(client.login, client.firstPassword, invoice, value, description)
}
// CheckResult получение уведомления об исполнении операции (ResultURL)
func (client *Client) CheckResult(r *http.Request) bool {
return verifyRequest(client.secondPassword, r)
}
func (client *Client) ResultInvoice(r *http.Request) (int, int, error) {
return getInvoice(client.secondPassword, r)
}
// CheckSuccess проверка параметров в скрипте завершения операции (SuccessURL)
func (client *Client) CheckSuccess(r *http.Request) bool {
return verifyRequest(client.firstPassword, r)
}
// New Client
func New(login, password1, password2 string) *Client {
return &Client{login, password1, password2}
}
// CRC of joint values with delimeter
func CRC(v ...interface{}) string {
s := make([]string, len(v))
for key, value := range v {
s[key] = fmt.Sprintf("%v", value)
}
h := md5.New()
io.WriteString(h, strings.Join(s, delim))
return fmt.Sprintf("%x", h.Sum(nil))
}
func buildRedirectURL(login, password string, invoice, value int, description string) string {
q := url.URL{}
q.Host = robokassaHost
q.Scheme = scheme
q.Path = robokassaPath
params := url.Values{}
params.Add(queryLogin, login)
params.Add(queryOutSumm, strconv.Itoa(value))
params.Add(queryInvID, strconv.Itoa(invoice))
params.Add(queryDescription, description)
params.Add(queryCRC, CRC(login, value, invoice, password))
q.RawQuery = params.Encode()
return q.String()
}
func verifyResult(password string, invoice int, value string, crc string) bool {
log.Println(crc, CRC(value, invoice, password), value, invoice, password)
return strings.ToUpper(crc) == strings.ToUpper(CRC(value, invoice, password))
}
func getInvoice(password string, r *http.Request) (int, int, error) {
q := r.URL.Query()
fvalue, err := strconv.ParseFloat(q.Get(queryOutSumm), 32)
if err != nil {
log.Println(err)
return 0, 0, ErrBadRequest
}
value := int(fvalue)
invoice, err := strconv.Atoi(q.Get(queryInvID))
if err != nil {
log.Println(err)
return 0, 0, ErrBadRequest
}
crc := q.Get(queryCRC)
if !verifyResult(password, invoice, q.Get(queryOutSumm), crc) {
log.Println("result not verified")
return 0, 0, ErrBadRequest
}
return invoice, value, nil
}
func verifyRequest(password string, r *http.Request) bool {
_, _, err := getInvoice(password, r)
return err == nil
}