23 lines
846 B
Ruby
23 lines
846 B
Ruby
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# From Rails 6
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# Remove once upgraded
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module SecureRandom
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BASE36_ALPHABET = ("0".."9").to_a + ("a".."z").to_a
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# SecureRandom.base36 generates a random base36 string in lowercase.
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#
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# The argument _n_ specifies the length of the random string to be generated.
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#
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# If _n_ is not specified or is +nil+, 16 is assumed. It may be larger in the future.
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# This method can be used over +base58+ if a deterministic case key is necessary.
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#
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# The result will contain alphanumeric characters in lowercase.
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#
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# p SecureRandom.base36 # => "4kugl2pdqmscqtje"
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# p SecureRandom.base36(24) # => "77tmhrhjfvfdwodq8w7ev2m7"
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def self.base36(n = 16)
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SecureRandom.random_bytes(n).unpack("C*").map do |byte|
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idx = byte % 64
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idx = SecureRandom.random_number(36) if idx >= 36
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BASE36_ALPHABET[idx]
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end.join
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end
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end
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