17 lines
397 B
Ruby
17 lines
397 B
Ruby
|
class Utils
|
||
|
|
def self.random_str(len)
|
||
|
|
str = ""
|
||
|
|
while str.length < len
|
||
|
|
chr = OpenSSL::Random.random_bytes(1)
|
||
|
|
ord = chr.unpack('C')[0]
|
||
|
|
|
||
|
|
# 0 9 A Z a z
|
||
|
|
if (ord >= 48 && ord <= 57) || (ord >= 65 && ord <= 90) || (ord >= 97 && ord <= 122)
|
||
|
|
str += chr
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
return str
|
||
|
|
end
|
||
|
|
end
|