Class: OpenAI::Resources::Webhooks

Inherits:
Object
  • Object
show all
Defined in:
lib/openai/resources/webhooks.rb,
sig/openai/resources/webhooks.rbs

Instance Method Summary collapse

Constructor Details

#initialize(client:) ⇒ Webhooks

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns a new instance of Webhooks.

Parameters:



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# File 'lib/openai/resources/webhooks.rb', line 128

def initialize(client:)
  @client = client
end

Instance Method Details

#unwrap(payload, headers = {}, webhook_secret = @client.webhook_secret || ENV["OPENAI_WEBHOOK_SECRET"]) ⇒ OpenAI::Models::Webhooks::BatchCancelledWebhookEvent, ...

Validates that the given payload was sent by OpenAI and parses the payload.

Parameters:

  • payload (String) —

    The raw webhook payload as a string

  • headers (Hash) (defaults to: {}) —

    The webhook headers

  • webhook_secret (String, nil) (defaults to: @client.webhook_secret || ENV["OPENAI_WEBHOOK_SECRET"]) —

    The webhook secret (optional, will use client webhook secret or ENV if not provided)

Returns:

Raises:

  • (ArgumentError) —

    if signature verification fails



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# File 'lib/openai/resources/webhooks.rb', line 15

def unwrap(
  payload,
  headers = {},
  webhook_secret = @client.webhook_secret || ENV["OPENAI_WEBHOOK_SECRET"]
)
  verify_signature(payload, headers, webhook_secret)

  parsed = JSON.parse(payload, symbolize_names: true)
  OpenAI::Internal::Type::Converter.coerce(OpenAI::Models::Webhooks::UnwrapWebhookEvent, parsed)
end

#verify_signature(payload, headers, webhook_secret = @client.webhook_secret || ENV["OPENAI_WEBHOOK_SECRET"], tolerance = 300) ⇒ Object

Validates whether or not the webhook payload was sent by OpenAI.

Parameters:

  • payload (String) —

    The webhook payload as a string

  • headers (Hash) —

    The webhook headers

  • webhook_secret (String, nil) (defaults to: @client.webhook_secret || ENV["OPENAI_WEBHOOK_SECRET"]) —

    The webhook secret (optional, will use client webhook secret or ENV if not provided)

  • tolerance (Integer) (defaults to: 300) —

    Maximum age of the webhook in seconds (default: 300 = 5 minutes)

Raises:

  • (ArgumentError) —

    if the signature is invalid



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# File 'lib/openai/resources/webhooks.rb', line 34

def verify_signature(
  payload,
  headers,
  webhook_secret = @client.webhook_secret || ENV["OPENAI_WEBHOOK_SECRET"],
  tolerance = 300
)
  if webhook_secret.nil? || webhook_secret.strip.empty?
    raise ArgumentError,
          "The webhook secret must either be set using the env var, OPENAI_WEBHOOK_SECRET, " \
          "or passed to this function"
  end

  header_names = %w[webhook-signature webhook-timestamp webhook-id]
  normalized_headers = {}
  headers.each do |name, value|
    name = name.to_s.downcase.delete_prefix("http_").tr("_", "-")
    next unless header_names.include?(name)

    if normalized_headers.key?(name) && normalized_headers[name] != value
      raise ArgumentError, "Conflicting values for #{name} header"
    end

    normalized_headers[name] = value
  end

  signature_header, timestamp_header, webhook_id = normalized_headers.values_at(*header_names)

  if signature_header.nil?
    raise ArgumentError, "Missing required webhook-signature header"
  end

  if timestamp_header.nil?
    raise ArgumentError, "Missing required webhook-timestamp header"
  end

  if webhook_id.nil?
    raise ArgumentError, "Missing required webhook-id header"
  end

  # Validate timestamp to prevent replay attacks
  begin
    timestamp_seconds = timestamp_header.to_i
  rescue ArgumentError
    raise ArgumentError, "Invalid webhook timestamp format"
  end

  now = Time.now.to_i

  if now - timestamp_seconds > tolerance
    raise OpenAI::Errors::InvalidWebhookSignatureError, "Webhook timestamp is too old"
  end

  if timestamp_seconds > now + tolerance
    raise OpenAI::Errors::InvalidWebhookSignatureError, "Webhook timestamp is too new"
  end

  # Extract signatures from v1,<base64> format
  # The signature header can have multiple values, separated by spaces.
  # Each value is in the format v1,<base64>. We should accept if any match.
  signatures = signature_header.split.map do |part|
    if part.start_with?("v1,")
      part[3..]
    else
      part
    end
  end

  # Decode the secret if it starts with whsec_
  decoded_secret = if webhook_secret.start_with?("whsec_")
    Base64.strict_decode64(webhook_secret[6..])
  else
    webhook_secret
  end

  raise ArgumentError, "The webhook secret must not be empty" if decoded_secret.empty?

  # Create the signed payload: {webhook_id}.{timestamp}.{payload}
  signed_payload = "#{webhook_id}.#{timestamp_header}.#{payload}"

  # Compute HMAC-SHA256 signature
  expected_signature = Base64.encode64(
    OpenSSL::HMAC.digest("sha256", decoded_secret, signed_payload)
  ).strip

  # Accept if any signature matches using timing-safe comparison
  return if signatures.any? { |signature| OpenSSL.secure_compare(expected_signature, signature) }

  raise OpenAI::Errors::InvalidWebhookSignatureError,
        "The given webhook signature does not match the expected signature"
end