thingspeak/lib/key_utilities.rb

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module KeyUtilities
# generates a database unique api key
def generate_api_key(size = 16)
alphanumerics = ('0'..'9').to_a + ('A'..'Z').to_a
k = (0..size).map {alphanumerics[Kernel.rand(36)]}.join
# if key exists in database, regenerate key
k = generate_api_key if ApiKey.find_by_api_key(k)
# output the key
k
end
end