Module: Ai2Web::Server

Defined in:
lib/ai2web/server.rb

Overview

Framework-agnostic AI2Web request handler. Port of @ai2web/server.

Returns a Hash { status:, headers:, body: }; adapt it to Rails / Sinatra / Rack / etc. body is a Ruby Hash (serialize to JSON in your adapter) or a String for text responses.

Constant Summary collapse

CORS = 
{
  "access-control-allow-origin" => "*",
  "access-control-allow-methods" => "GET, POST, OPTIONS",
  "access-control-allow-headers" => "content-type, authorization"
}.freeze
ACTION_RE = 
%r{\A/ai2w/actions/([a-z0-9_-]+)\z}i.freeze
MODULE_RE = 
%r{\A/ai2w/([a-z0-9_-]+)\z}i.freeze

Class Method Summary collapse

Class Method Details

.error(status, code, message, retryable: false) ⇒ Object 



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# File 'lib/ai2web/server.rb', line 24

def error(status, code, message, retryable: false)
  json(status, { "error" => { "code" => code, "message" => message, "retryable" => retryable } })
end

.handle(opts, method, path, body = nil, origin = nil) ⇒ Object 



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# File 'lib/ai2web/server.rb', line 40

def handle(opts, method, path, body = nil, origin = nil)
  manifest = Util.deep_stringify(opt(opts, :manifest))
  modules = opt(opts, :modules) || {}
  actions = opt(opts, :actions) || {}
  validate_input = opts.key?(:validate_input) || opts.key?("validate_input") ? opt(opts, :validate_input) : true
  declared_actions = {}
  (manifest["actions"] || []).each { |a| declared_actions[a["name"]] = a if a.is_a?(Hash) }

  trimmed = path.to_s.gsub(%r{\A/+|/+\z}, "")
  path = trimmed.empty? ? "/" : "/#{trimmed}"
  method = method.to_s.upcase

  return { status: 204, headers: CORS.dup, body: nil } if method == "OPTIONS"

  if path == "/.well-known/ai2w"
    return json(200, { "ai2w" => "#{Util.trim_url(origin)}/ai2w" }) if origin && !origin.to_s.empty?

    return json(200, manifest)
  end

  if ["/ai2w", "/ai", "/.ai"].include?(path)
    return error(405, "invalid_request", "Use GET for the manifest.") if method != "GET"

    return json(200, manifest)
  end

  # Multi-surface projections (RFC-0015): the one canonical manifest, emitted in other discovery
  # formats so agents that speak llms.txt or agent.json need not parse ai2w first.
  if path == "/llms.txt"
    return error(405, "invalid_request", "Use GET for llms.txt.") if method != "GET"

    return text(200, "text/plain; charset=utf-8", Ai2Web.to_llms_txt(manifest))
  end
  if ["/.well-known/agent.json", "/agent.json"].include?(path)
    return error(405, "invalid_request", "Use GET for agent.json.") if method != "GET"

    return json(200, Ai2Web.to_agent_json(manifest))
  end

  if path == "/ai2w/negotiate"
    b = body.is_a?(Hash) ? Util.deep_stringify(body) : {}
    agent = b["agent"].is_a?(Hash) ? b["agent"] : {}
    supports = agent["supports"] || b["supports"] || b
    supports = {} unless supports.is_a?(Hash)
    return json(200, Ai2Web.negotiate(manifest, supports))
  end

  if (m = ACTION_RE.match(path))
    name = m[1].tr("-", "_")
    fn = lookup(actions, name)
    return error(404, "unsupported_capability", "Unknown action '#{name}'.") unless fn

    declared = declared_actions[name]
    if Util.truthy?(validate_input) && declared && declared["input_schema"]
      result = Ai2Web.validate_schema(body.nil? ? {} : body, declared["input_schema"])
      unless result.valid
        return error(400, "invalid_request",
                     "Request does not match the declared input schema: #{result.errors.join("; ")}.")
      end
    end
    return json(200, fn.call(body))
  end

  if (m = MODULE_RE.match(path))
    name = m[1]
    fn = lookup(modules, name)
    return error(404, "unsupported_capability", "Module '#{name}' not exposed.") unless fn

    return json(200, fn.call(body))
  end

  error(404, "invalid_request", "No AI2Web route for #{path}.")
end

.json(status, body) ⇒ Object 



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# File 'lib/ai2web/server.rb', line 20

def json(status, body)
  { status: status, headers: { "content-type" => "application/json; charset=utf-8" }.merge(CORS), body: body }
end

.lookup(table, name) ⇒ Object 



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# File 'lib/ai2web/server.rb', line 36

def lookup(table, name)
  table[name] || table[name.to_sym]
end

.opt(opts, key) ⇒ Object 



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# File 'lib/ai2web/server.rb', line 32

def opt(opts, key)
  opts[key] || opts[key.to_s]
end

.text(status, content_type, body) ⇒ Object 



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# File 'lib/ai2web/server.rb', line 28

def text(status, content_type, body)
  { status: status, headers: { "content-type" => content_type }.merge(CORS), body: body }
end