生成随机字符串，支持多位多种模式

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import(
"math/rand"
)

//随机字符串 Model:字母数字符号
/*
   Model 110 必须包含字母数字
   Model 111 必须包含字母数字和符号
   Model 210 必须包含大写字母，小写字母及数字
   Model 211 必须包含大写字母，小写字母及数字及符号
   Model 321 字母数字符号三选二
   Model 999 字母数字符号随机
   Model else 字母数字随机
*/
func MakeRandomString(Length int64, Model string) string {
   AlphaLowCaseStr := "abcdefghijklmnopqrstuvwxyz"
   AlphaUpCaseStr := "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
   AlphaStr := AlphaLowCaseStr + AlphaUpCaseStr
   NumStr := "0123456789"
   SymbolStr := "`~!@#$%^&*()_+-=[]{}|\\:;\"'<>/?"

   var AlphaUpCaseLen, AlphaLowCaseLen, AlphaLen, NumLen, SymbolLen int64
   var str string
   result := []byte{}
   if Length == 0 {
      return ""
   }
   if Model == "110" { //必须包含字母数字
      if Length > 1 {
         AlphaLen = RandInt64(1, Length-1)
         NumLen = Length - AlphaLen
      } else { //长度小于等于1
         var letterBytes = AlphaStr + NumStr
         b := make([]byte, Length)
         for i := range b {
            b[i] = letterBytes[rand.Int63()%int64(len(letterBytes))]
         }
         return string(b)
      }
   } else if Model == "111" { //必须包含字母数字和符号
      if Length > 2 {
         AlphaLen = RandInt64(1, Length-2)
         NumLen = RandInt64(1, AlphaLen)
         SymbolLen = Length - AlphaLen - NumLen
      } else { //长度小于等于2
         var letterBytes = AlphaStr + NumStr + SymbolStr
         b := make([]byte, Length)
         for i := range b {
            b[i] = letterBytes[rand.Int63()%int64(len(letterBytes))]
         }
         return string(b)
      }
   } else if Model == "210" { //必须包含大写字母，小写字母及数字
      if Length > 2 {
         AlphaUpCaseLen = RandInt64(1, Length-2)
         AlphaLowCaseLen = RandInt64(1, AlphaUpCaseLen)
         NumLen = Length - AlphaUpCaseLen - AlphaLowCaseLen
      } else { //长度小于等于2
         var letterBytes = AlphaStr + NumStr
         b := make([]byte, Length)
         for i := range b {
            b[i] = letterBytes[rand.Int63()%int64(len(letterBytes))]
         }
         return string(b)
      }
   } else if Model == "211" { //必须包含大写字母，小写字母及数字及符号
      if Length > 3 {
         AlphaUpCaseLen = RandInt64(1, Length-3)
         AlphaLowCaseLen = RandInt64(1, Length-AlphaUpCaseLen-2)
         NumLen = RandInt64(1, Length-AlphaUpCaseLen-AlphaLowCaseLen-1)
         SymbolLen = Length - AlphaUpCaseLen - AlphaLowCaseLen - NumLen
      } else { //长度小于等于3
         var letterBytes = AlphaStr + NumStr + SymbolStr
         b := make([]byte, Length)
         for i := range b {
            b[i] = letterBytes[rand.Int63()%int64(len(letterBytes))]
         }
         return string(b)
      }
   } else if Model == "321" { //字母数字符号三选二
      if Length > 1 {
         AlphaLen = RandInt64(0, Length-1)
         if AlphaLen == 0 {
            NumLen = RandInt64(1, Length-1) //Alpha没选，Num至少选一个，最多选L-1
         } else {
            NumLen = RandInt64(0, Length-AlphaLen) //Alpha选了，Num可以不选，最多就能选Alpha剩下的
         }
         SymbolLen = Length - AlphaLen - NumLen
      } else {
         var letterBytes = AlphaStr + NumStr + SymbolStr
         b := make([]byte, Length)
         for i := range b {
            b[i] = letterBytes[rand.Int63()%int64(len(letterBytes))]
         }
         return string(b)
      }
   } else if Model == "999" { //其他: 字母数字符号随机
      str = AlphaStr + NumStr + SymbolStr
      Bytes := []byte(str)
      r := rand.New(rand.NewSource(time.Now().UnixNano()))
      for i := int64(0); i < Length; i++ {
         result = append(result, Bytes[r.Intn(len(Bytes))])
      }
      return string(result)
   } else { //其他：字母数字随机
      str = AlphaStr + NumStr
      Bytes := []byte(str)
      r := rand.New(rand.NewSource(time.Now().UnixNano()))
      for i := int64(0); i < Length; i++ {
         result = append(result, Bytes[r.Intn(len(Bytes))])
      }
      return string(result)
   }

   if AlphaUpCaseLen != 0 {
      AlphaUpCaseBytes := []byte(AlphaUpCaseStr)
      AlphaUpCaseRand := rand.New(rand.NewSource(time.Now().UnixNano()))
      for i := int64(0); i < AlphaUpCaseLen; i++ {
         result = append(result, AlphaUpCaseBytes[AlphaUpCaseRand.Intn(len(AlphaUpCaseBytes))])
      }
   }

   if AlphaLowCaseLen != 0 {
      AlphaLowCaseBytes := []byte(AlphaLowCaseStr)
      AlphaLowCaseRand := rand.New(rand.NewSource(time.Now().UnixNano()))
      for i := int64(0); i < AlphaLowCaseLen; i++ {
         result = append(result, AlphaLowCaseBytes[AlphaLowCaseRand.Intn(len(AlphaLowCaseBytes))])
      }
   }

   if NumLen != 0 {
      NumBytes := []byte(NumStr)
      NumRand := rand.New(rand.NewSource(time.Now().UnixNano()))
      for i := int64(0); i < NumLen; i++ {
         result = append(result, NumBytes[NumRand.Intn(len(NumBytes))])
      }
   }

   if AlphaLen != 0 {
      AlphaBytes := []byte(AlphaStr)
      AlphaRand := rand.New(rand.NewSource(time.Now().UnixNano()))
      for i := int64(0); i < AlphaLen; i++ {
         result = append(result, AlphaBytes[AlphaRand.Intn(len(AlphaBytes))])
      }
   }

   if SymbolLen != 0 {
      SymbolBytes := []byte(SymbolStr)
      SymbolRand := rand.New(rand.NewSource(time.Now().UnixNano()))
      for i := int64(0); i < SymbolLen; i++ {
         result = append(result, SymbolBytes[SymbolRand.Intn(len(SymbolBytes))])
      }
   }

   for i := len(result) - 1; i > 0; i-- {
      num := rand.Intn(i + 1)
      result[i], result[num] = result[num], result[i]
   }
   return string(result)
}

//RandInt64 取两个数之间的随机数
func RandInt64(min, max int64) int64 {
   //仅支持非负整数，且两端不能同时等于0，否则返回0
   if min < 0 || max < 0 || (min == 0 && max == 0) {
      return 0
   }
   if min >= max {
      return rand.Int63n(min-max) + max
   }
   return rand.Int63n(max-min) + min
}

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