Class: Myrr::Rack::Middleware

Inherits:
Object
  • Object
show all
Defined in:
lib/myrr/rack/middleware.rb

Overview

Rack middleware that detects X-Myrr-Agent headers on incoming requests, performs challenge-response verification against the protocol server (or uses a configured identity_adapter), and sets request.env["myrr.current_agent"].

After the inner app runs, if the response is text/markdown, it counts the tokens and adds env["myrr.token_count"] and the X-Myrr-Tokens response header.

Instance Method Summary collapse

Constructor Details

#initialize(app, myrr_module = nil) ⇒ Middleware

Returns a new instance of Middleware.

Parameters:

  • app (Rack app) —

    The downstream Rack application

  • myrr (Module) —

    The Myrr module (defaults to Myrr)



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# File 'lib/myrr/rack/middleware.rb', line 14

def initialize(app, myrr_module = nil)
  @app = app
  @myrr = myrr_module || Myrr
end

Instance Method Details

#call(env) ⇒ Object

Parameters:

  • env (Hash) —

    Rack environment



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# File 'lib/myrr/rack/middleware.rb', line 20

def call(env)
  agent_did = env["HTTP_X_MYRR_AGENT"]

  if agent_did && !agent_did.empty?
    begin
      agent_info = @myrr.verify_agent(agent_did)
      if agent_info
        env["myrr.current_agent"] = agent_info
        override_format_to_markdown(env) if should_override_format?(env)
      end
    rescue => e
      if @myrr.config&.fail_open
        warn "[myrr] Agent verification failed (fail_open=true): #{e.message}"
      else
        return fail_response(env, e.message)
      end
    end
  end

  status, headers, body = @app.call(env)

  # Token counting for markdown responses
  if env["myrr.current_agent"] && content_type_is_markdown?(headers)
    body_text = extract_body(body)
    token_count = @myrr::Tokenizer.count(body_text)
    env["myrr.token_count"] = token_count
    headers["X-Myrr-Tokens"] = token_count.to_s
  end

  [status, headers, body]
end