Class: X402::Payments::Generator

Inherits:
Object
  • Object
show all
Defined in:
lib/x402/payments/generator.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config = X402::Payments.configuration) ⇒ Generator

Returns a new instance of Generator.



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# File 'lib/x402/payments/generator.rb', line 14

def initialize(config = X402::Payments.configuration)
  @config = config
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/x402/payments/generator.rb', line 12

def config
  @config
end

Instance Method Details

#generate_header(amount:, resource:, description: nil, network: nil, private_key: nil, pay_to: nil, extra: nil, version: nil) ⇒ Object 



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# File 'lib/x402/payments/generator.rb', line 18

def generate_header(amount:, resource:, description: nil, network: nil, private_key: nil, pay_to: nil, extra: nil, version: nil)
  config.validate!

  protocol_version = X402::Payments.normalize_version(version) || config.protocol_version
  chain_name = network || config.chain
  key = private_key || config.private_key
  recipient = pay_to || config.default_pay_to

  token_config = X402::Payments.token_config_for(chain_name)
  asset_address = X402::Payments.asset_address_for(chain_name)

  atomic_amount = convert_to_atomic(amount, token_config[:decimals])

   = Eth::Key.new(priv: key)
  sender_address = .address.to_s

  nonce_bytes = SecureRandom.random_bytes(32)
  nonce_hex = "0x#{nonce_bytes.unpack1('H*')}"

  valid_after = (Time.now.to_i - 60).to_s
  valid_before = (Time.now.to_i + config.max_timeout_seconds).to_s

  authorization = {
    from: sender_address,
    to: recipient,
    value: atomic_amount.to_s,
    valid_after: valid_after,
    valid_before: valid_before,
    nonce: nonce_hex
  }

  extra_data = extra || {
    name: token_config[:name],
    version: token_config[:version]
  }

  signature = sign_authorization(
    account: ,
    authorization: authorization,
    chain_name: chain_name,
    asset: asset_address,
    extra: extra_data,
    nonce_bytes: nonce_bytes
  )

  payload = build_payload(
    version: protocol_version,
    authorization: authorization,
    signature: signature,
    resource: resource,
    description: description,
    chain_name: chain_name,
    asset_address: asset_address,
    atomic_amount: atomic_amount,
    recipient: recipient,
    extra: extra_data
  )

  encode_payment(payload)
end

#generate_header_for(payment_required, private_key: nil) ⇒ Object

Raises:



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# File 'lib/x402/payments/generator.rb', line 79

def generate_header_for(payment_required, private_key: nil)
  key = private_key || config.private_key
  raise ConfigurationError, "private_key is required" if key.nil? || key.empty?

  version = X402::Payments.normalize_version(payment_required[:version]) || 1
  accepts = payment_required[:accepts]&.first
  raise Error, "No payment requirements found" unless accepts

  resource_info = payment_required[:resource] || {}
  chain_name = resolve_chain_name(accepts[:network])
  token_config = X402::Payments.token_config_for(chain_name)

   = Eth::Key.new(priv: key)
  sender_address = .address.to_s

  nonce_bytes = SecureRandom.random_bytes(32)
  nonce_hex = "0x#{nonce_bytes.unpack1('H*')}"

  valid_after = (Time.now.to_i - 60).to_s
  valid_before = (Time.now.to_i + (accepts[:max_timeout_seconds] || config.max_timeout_seconds)).to_s

  authorization = {
    from: sender_address,
    to: accepts[:pay_to],
    value: accepts[:amount],
    valid_after: valid_after,
    valid_before: valid_before,
    nonce: nonce_hex
  }

  extra_data = accepts[:extra] || {}
  extra_data = {
    name: extra_data[:name] || extra_data["name"] || token_config[:name],
    version: extra_data[:version] || extra_data["version"] || token_config[:version]
  }

  signature = sign_authorization(
    account: ,
    authorization: authorization,
    chain_name: chain_name,
    asset: accepts[:asset],
    extra: extra_data,
    nonce_bytes: nonce_bytes
  )

  payload = case version
            when 2
              V2::PayloadBuilder.build(
                authorization: authorization,
                signature: signature,
                resource: {
                  url: resource_info[:url],
                  description: resource_info[:description],
                  mime_type: resource_info[:mime_type]
                },
                accepted: {
                  scheme: accepts[:scheme],
                  network: accepts[:network],
                  amount: accepts[:amount],
                  asset: accepts[:asset],
                  pay_to: accepts[:pay_to],
                  max_timeout_seconds: accepts[:max_timeout_seconds],
                  extra: extra_data
                },
                extensions: payment_required[:extensions] || {}
              )
            else
              V1::PayloadBuilder.build(
                authorization: authorization,
                signature: signature,
                scheme: accepts[:scheme],
                network: chain_name
              )
            end

  encode_payment(payload)
end

#generate_link(amount:, resource:, description: nil, network: nil, private_key: nil, pay_to: nil, extra: nil, version: nil) ⇒ Object 



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# File 'lib/x402/payments/generator.rb', line 157

def generate_link(amount:, resource:, description: nil, network: nil, private_key: nil, pay_to: nil, extra: nil, version: nil)
  protocol_version = X402::Payments.normalize_version(version) || config.protocol_version
  header = generate_header(
    amount: amount,
    resource: resource,
    description: description,
    network: network,
    private_key: private_key,
    pay_to: pay_to,
    extra: extra,
    version: protocol_version
  )

  header_name = X402::Payments.payment_header_name(protocol_version)

  {
    payment_header: header,
    header_name: header_name,
    curl_command: "curl -s -H \"#{header_name}: #{header}\" #{resource} | jq ."
  }
end