47 lines
1.7 KiB
Go
47 lines
1.7 KiB
Go
package random
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import (
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"math/rand"
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"os"
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"time"
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)
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var (
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PossibleNumbers = "0123456789"
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PossibleLowerCase = "abcdefghijklmnopqrstuvwxyz"
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PossibleUpperCase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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PossibleSpecialCharacter = " !\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~"
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PossibleAlphaNum = PossibleNumbers + PossibleLowerCase + PossibleUpperCase
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PossibleAlphaNumLower = PossibleNumbers + PossibleLowerCase
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PossibleAlphaNumUpper = PossibleNumbers + PossibleUpperCase
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)
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var rnd = rand.New(rand.NewSource(time.Now().UnixNano() + int64(os.Getpid())))
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// Numbers returns a random numeric string of the given length
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func Numbers(length int) string { return String(PossibleNumbers, length) }
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// AlphaNum returns a random alphanumeric string of the given length. The
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// returned string can contain both uppercase and lowercase letters.
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func AlphaNum(length int) string { return String(PossibleAlphaNum, length) }
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// AlphaNumLower returns a random alphanumeric string of the given length. The
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// returned string can contain lowercase letters, but not uppercase.
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func AlphaNumLower(length int) string { return String(PossibleAlphaNumLower, length) }
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// AlphaNumUpper returns a random alphanumeric string of the given length. The
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// returned string can contain uppercase letters, but not lowercase.
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func AlphaNumUpper(length int) string { return String(PossibleAlphaNumUpper, length) }
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// String returns a random string of the given length, using only the component
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// characters provided in the "chooseFrom" string.
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func String(chooseFrom string, length int) (randomString string) {
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cflen := len(chooseFrom)
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bytes := make([]byte, length)
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for i := range bytes {
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bytes[i] = chooseFrom[rnd.Intn(cflen)]
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}
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return string(bytes)
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}
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