generate

Generates a signed message for the provided value.

The message is signed with the MessageVerifier's secret. Returns Base64-encoded message joined with the generated signature.

verifier = ActiveSupport::MessageVerifier.new("secret")
verifier.generate("signed message") # => "BAhJIhNzaWduZWQgbWVzc2FnZQY6BkVU--f67d5f27c3ee0b8483cebf2103757455e947493b"

Options

:expires_at

The datetime at which the message expires. After this datetime, verification of the message will fail.

message = verifier.generate("hello", expires_at: Time.now.tomorrow)
verifier.verified(message) # => "hello"
# 24 hours later...
verifier.verified(message) # => nil
verifier.verify(message)   # => raises ActiveSupport::MessageVerifier::InvalidSignature

:expires_in

The duration for which the message is valid. After this duration has elapsed, verification of the message will fail.

message = verifier.generate("hello", expires_in: 24.hours)
verifier.verified(message) # => "hello"
# 24 hours later...
verifier.verified(message) # => nil
verifier.verify(message)   # => raises ActiveSupport::MessageVerifier::InvalidSignature

:purpose

The purpose of the message. If specified, the same purpose must be specified when verifying the message; otherwise, verification will fail. (See #verified and #verify.)