Ruby - Sign-In with Ethereum

Getting started
The Ruby implementation of Sign-In with Ethereum can be found here:
GitHub - spruceid/siwe-ruby: A ruby implementation of Sign-In with Ethereum
GitHub
Sign-In with Ethereum can be found on RubyGems. For more information and package information, click here​
Installation
Dependencies
Additional packages may be required to install the gem:
macOS
Linux
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brew install automake openssl libtool pkg-config gmp libffi
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sudo apt-get install build-essential automake pkg-config libtool \
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                     libffi-dev libssl-dev libgmp-dev python-dev
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After installing any required dependencies SIWE can be easily installed with:
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gem install siwe
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Usage
SIWE provides a Message class which implements EIP-4361.
Creating a SIWE Message
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require 'siwe'
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require 'time'
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​
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# Only the mandatory arguments
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Siwe::Message.new("domain.example", "0x9D85ca56217D2bb651b00f15e694EB7E713637D4", "some.uri", "1")
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​
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# Complete SIWE message with default values
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Siwe::Message.new("domain.example", "0x9D85ca56217D2bb651b00f15e694EB7E713637D4", "some.uri", "1", {
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                                   issued_at: Time.now.utc.iso8601,
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                                   statement: "Example statement for SIWE",
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                                   nonce: Siwe::Util.generate_nonce,
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                                   chain_id: "1",
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                                   expiration_time: "",
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                                   not_before: "",
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                                   request_id: "",
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                                   resources: []
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                                 })
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​
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Parsing a SIWE Message
From EIP-4361
From JSON string
To parse from EIP-4361 you have to use Siwe::Message.from_message
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require 'siwe'
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​
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Siwe::Message.from_message "domain.example wants you to sign in with your Ethereum account:\n0x9D85ca56217D2bb651b00f15e694EB7E713637D4\n\nExample statement for SIWE\n\nURI: some.uri\nVersion: 1\nChain ID: 1\nNonce: k1Ne4KWzBHYEFQo8\nIssued At: 2022-02-03T20:06:19Z"
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Messages can be parsed to and from JSON strings, using Siwe::Message.from_json_string and Siwe::Message.to_json_string respectively:
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require 'siwe'
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​
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Siwe::Message.from_json_string "{\"domain\":\"domain.example\",\"address\":\"0x9D85ca56217D2bb651b00f15e694EB7E713637D4\",\"uri\":\"some.uri\",\"version\":\"1\",\"chain_id\":\"1\",\"nonce\":\"k1Ne4KWzBHYEFQo8\",\"issued_at\":\"2022-02-03T20:06:19Z\",\"statement\":\"Example statement for SIWE\",\"expiration_time\":\"\",\"not_before\":\"\",\"request_id\":\"\",\"resources\":[]}"
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​
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Siwe::Message.new("domain.example", "0x9D85ca56217D2bb651b00f15e694EB7E713637D4", "some.uri", "1").to_json_string
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Verifying and Authenticating a SIWE Message
Verification and authentication is performed via EIP-191, using the address field of the SiweMessage as the expected signer. The validate method checks message structural integrity, signature address validity, and time-based validity attributes.
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begin
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    message.validate(signature) # returns true if valid throws otherwise
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rescue Siwe::ExpiredMessage
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    # Used when the message is already expired. (Expires At < Time.now)
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rescue Siwe::NotValidMessage
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    # Used when the message is not yet valid. (Not Before > Time.now)
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rescue Siwe::InvalidSignature
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    # Used when the signature doesn't correspond to the address of the message.
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end
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Serialization of a SIWE Message
Siwe::Message instances can also be serialized as their EIP-4361 string representations via the Siwe::Message.prepare_message method:
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require 'siwe'
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​
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Siwe::Message.new("domain.example", "0x9D85ca56217D2bb651b00f15e694EB7E713637D4", "some.uri", "1").prepare_message
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Example
Parsing and verifying a Siwe::Message:
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require 'siwe'
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​
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begin
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    message = Siwe::Message.from_message "https://example.com wants you to sign in with your Ethereum account:\n0xA712a0AFBFA8656581BfA96352c9EdFc519e9cad\n\n\nURI: https://example.com\nVersion: 1\nChain ID: 1\nNonce: 9WrH24z8zpiYOoBQ\nIssued At: 2022-02-04T15:52:03Z"
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    message.validate "aca5e5649a357cee608ecbd1a8455b4143311381636b88a66ec7bcaf64b3a4743ff2c7cc18501a3401e182f79233dc73fc56d01506a6098d5e7e4d881bbb02921c"
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    puts "Congrats, your message is valid"
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rescue Siwe::ExpiredMessage
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    # Used when the message is already expired. (Expires At < Time.now)
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rescue Siwe::NotValidMessage
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    # Used when the message is not yet valid. (Not Before > Time.now)
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rescue Siwe::InvalidSignature
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    # Used when the signature doesn't correspond to the address of the message.
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end
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