Convert captcha, cache, csrf as middlewares

modules/base/tool.go

@@ -13,7 +13,6 @@ import (
 	"fmt"
 	"hash"
 	"math"
-	r "math/rand"
 	"strings"
 	"time"
 
@@ -45,33 +44,6 @@ func GetRandomString(n int, alphabets ...byte) string {
 	return string(bytes)
 }
 
-// RandomCreateBytes generate random []byte by specify chars.
-func RandomCreateBytes(n int, alphabets ...byte) []byte {
-	const alphanum = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
-	var bytes = make([]byte, n)
-	var randby bool
-	if num, err := rand.Read(bytes); num != n || err != nil {
-		r.Seed(time.Now().UnixNano())
-		randby = true
-	}
-	for i, b := range bytes {
-		if len(alphabets) == 0 {
-			if randby {
-				bytes[i] = alphanum[r.Intn(len(alphanum))]
-			} else {
-				bytes[i] = alphanum[b%byte(len(alphanum))]
-			}
-		} else {
-			if randby {
-				bytes[i] = alphabets[r.Intn(len(alphabets))]
-			} else {
-				bytes[i] = alphabets[b%byte(len(alphabets))]
-			}
-		}
-	}
-	return bytes
-}
-
 // http://code.google.com/p/go/source/browse/pbkdf2/pbkdf2.go?repo=crypto
 func PBKDF2(password, salt []byte, iter, keyLen int, h func() hash.Hash) []byte {
 	prf := hmac.New(h, password)