Module: Legion::LLM::API::Auth

Extended by:
Legion::Logging::Helper
Defined in:
lib/legion/llm/api/auth.rb

Class Method Summary collapse

Class Method Details

.anthropic_client?(env) ⇒ Boolean

Detects whether the incoming request is from an Anthropic SDK client. Anthropic clients set anthropic-version header, or use x-api-key without a Bearer token.

Returns:

  • (Boolean) 


71
72
73
74
75
 
# File 'lib/legion/llm/api/auth.rb', line 71

def self.anthropic_client?(env)
  return true if env['HTTP_ANTHROPIC_VERSION']

  env['HTTP_X_API_KEY'] && !env['HTTP_AUTHORIZATION']&.match?(/\ABearer\s+/i)
end

.registered(app) ⇒ Object 



11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
 
# File 'lib/legion/llm/api/auth.rb', line 11

def self.registered(app)
  log.debug('[llm][api][auth] registering /v1/* and /api/llm/inference/v1/* before filters')

  auth_check = proc do
    log.debug("[llm][api][auth] before filter action=check path=#{request.path_info}")
    next unless auth_enabled?

    token = extract_token(request)
    log.debug("[llm][api][auth] action=validate token_present=#{!token.nil?}")

    unless valid_token?(token)
      log.warn("[llm][api][auth] action=rejected reason=invalid_token path=#{request.path_info}")
      error_body = if Auth.anthropic_client?(request.env)
                     { type: 'error', error: { type: 'authentication_error', message: 'Invalid API key' } }
                   else
                     { error: { message: 'Invalid API key', type: 'authentication_error' } }
                   end
      halt 401, { 'Content-Type' => 'application/json' }, Legion::JSON.dump(error_body)
    end

    log.debug("[llm][api][auth] action=authorized path=#{request.path_info}")
  end

  app.before('/api/llm/inference/v1/*', &auth_check)

  app.before('/v1/*', &auth_check)

  app.helpers do
    define_method(:auth_enabled?) do
      Legion::LLM::Settings.value(:api, :auth, :enabled) == true
    end

    define_method(:extract_token) do |req|
      auth_header = req.env['HTTP_AUTHORIZATION']
      if auth_header&.match?(/\ABearer\s+/i)
        log.debug('[llm][api][auth] token_source=bearer_header')
        return auth_header.sub(/\ABearer\s+/i, '')
      end

      key = req.env['HTTP_X_API_KEY']
      log.debug("[llm][api][auth] token_source=x_api_key present=#{!key.nil?}")
      key
    end

    define_method(:valid_token?) do |token|
      return true unless auth_enabled?
      return false if token.nil? || token.empty?

      keys = Legion::LLM::Settings.value(:api, :auth, :api_keys, default: [])
      keys.include?(token)
    end
  end

  log.debug('[llm][api][auth] /v1/* and /api/llm/inference/v1/* before filters registered')
rescue StandardError => e
  handle_exception(e, level: :error, handled: false, operation: 'llm.api.auth.register')
end