Class: Clacky::Mcp::OAuth::AuthorizationManager

Inherits:
Object
  • Object
show all
Defined in:
lib/clacky/mcp/oauth/authorization_manager.rb

Defined Under Namespace

Classes: CallbackReceiver, Error, Response

Constant Summary collapse

MAX_RESPONSE_BYTES = 
1_048_576

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(server_name:, config:, store:, requester: nil, callback: nil, clock: nil) ⇒ AuthorizationManager

Returns a new instance of AuthorizationManager.



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# File 'lib/clacky/mcp/oauth/authorization_manager.rb', line 25

def initialize(server_name:, config:, store:, requester: nil, callback: nil, clock: nil)
  @server_name = server_name
  @config = config
  @store = store
  @requester = requester || method(:request)
  @callback = callback
  @clock = clock || -> { Time.now.to_i }
end

Class Method Details

.pkce_challenge(verifier) ⇒ Object 



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# File 'lib/clacky/mcp/oauth/authorization_manager.rb', line 21

def self.pkce_challenge(verifier)
  Base64.urlsafe_encode64(Digest::SHA256.digest(verifier), padding: false)
end

Instance Method Details

#login(resource_metadata_url: nil) ⇒ Object 



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# File 'lib/clacky/mcp/oauth/authorization_manager.rb', line 34

def (resource_metadata_url: nil)
  raise Error, "MCP server '#{@server_name}' is not configured for OAuth" unless @config.enabled?

  receiver = @callback || CallbackReceiver.new
  redirect_uri = receiver.respond_to?(:redirect_uri) ? receiver.redirect_uri : "http://127.0.0.1:52963/callback"
  metadata = discover_metadata(resource_metadata_url)
  client = register_client(metadata, redirect_uri)
  verifier = SecureRandom.urlsafe_base64(48, false)
  state = SecureRandom.urlsafe_base64(32, false)
  authorization_url = build_authorization_url(metadata, client.fetch("client_id"), redirect_uri, verifier, state)
  callback_result = receiver.call(authorization_url, state)
  raise Error, "OAuth callback state mismatch" unless callback_result["state"].to_s == state
  raise Error, "OAuth authorization returned no code" if callback_result["code"].to_s.empty?

  token = token_request(metadata.fetch("token_endpoint"), {
    "grant_type" => "authorization_code",
    "code" => callback_result.fetch("code"),
    "redirect_uri" => redirect_uri,
    "client_id" => client.fetch("client_id"),
    "code_verifier" => verifier
  })
  grant = normalize_token(token).merge(
    "client_id" => client.fetch("client_id"),
    "client_secret" => client["client_secret"],
    "token_endpoint_auth_method" => client["token_endpoint_auth_method"] || "none",
    "token_endpoint" => metadata.fetch("token_endpoint"),
    "authorization_server" => metadata.fetch("issuer"),
    "resource" => @config.resource
  )
  @store.save(grant)
ensure
  receiver.close if defined?(receiver) && receiver.respond_to?(:close)
end

#refresh(grant) ⇒ Object 



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# File 'lib/clacky/mcp/oauth/authorization_manager.rb', line 68

def refresh(grant)
  refresh_token = grant["refresh_token"].to_s
  raise Error, "OAuth refresh token is missing; log in again" if refresh_token.empty?

  fields = {
    "grant_type" => "refresh_token",
    "refresh_token" => refresh_token,
    "client_id" => grant.fetch("client_id")
  }
  token = token_request(grant.fetch("token_endpoint"), fields,
                        client_secret: grant["client_secret"],
                        auth_method: grant["token_endpoint_auth_method"])
  updated = grant.merge(normalize_token(token))
  updated["refresh_token"] = refresh_token if token["refresh_token"].to_s.empty?
  updated
rescue KeyError
  raise Error, "stored OAuth grant is incomplete; log in again"
end