Module: Legion::API::Routes::Auth

Defined in:
lib/legion/api/auth.rb

Class Method Summary collapse

Class Method Details

.register_token_exchange(app) ⇒ Object

rubocop:disable Metrics/MethodLength



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# File 'lib/legion/api/auth.rb', line 11

def self.register_token_exchange(app) # rubocop:disable Metrics/MethodLength
  app.post '/api/auth/token' do
    Legion::Logging.debug "API: POST /api/auth/token params=#{params.keys}"
    body = parse_request_body
    grant_type = body[:grant_type]
    subject_token = body[:subject_token]

    unless grant_type == 'urn:ietf:params:oauth:grant-type:token-exchange'
      Legion::Logging.warn "API POST /api/auth/token returned 400: unsupported grant_type=#{grant_type}"
      halt 400, json_error('unsupported_grant_type', 'expected urn:ietf:params:oauth:grant-type:token-exchange',
                           status_code: 400)
    end

    unless subject_token
      Legion::Logging.warn 'API POST /api/auth/token returned 400: subject_token is required'
      halt 400, json_error('missing_subject_token', 'subject_token is required', status_code: 400)
    end

    unless defined?(Legion::Crypt::JWT) && Legion::Crypt::JWT.respond_to?(:verify_with_jwks)
      halt 501, json_error('jwks_validation_not_available', 'legion-crypt JWKS support not loaded',
                           status_code: 501)
    end

    rbac_settings = (Legion::Settings[:rbac].is_a?(Hash) && Legion::Settings[:rbac][:entra]) || {}
    tenant_id = rbac_settings[:tenant_id]
    unless tenant_id
      Legion::Logging.error 'API POST /api/auth/token returned 500: rbac.entra.tenant_id not set'
      halt 500, json_error('entra_tenant_not_configured', 'rbac.entra.tenant_id not set', status_code: 500)
    end

    jwks_url = "https://login.microsoftonline.com/#{tenant_id}/discovery/v2.0/keys"
    issuer = "https://login.microsoftonline.com/#{tenant_id}/v2.0"

    begin
      entra_claims = Legion::Crypt::JWT.verify_with_jwks(
        subject_token, jwks_url: jwks_url, issuers: [issuer]
      )
    rescue Legion::Crypt::JWT::ExpiredTokenError
      Legion::Logging.warn 'API POST /api/auth/token returned 401: Entra token has expired'
      halt 401, json_error('token_expired', 'Entra token has expired', status_code: 401)
    rescue Legion::Crypt::JWT::InvalidTokenError => e
      Legion::Logging.warn "API POST /api/auth/token returned 401: #{e.message}"
      halt 401, json_error('invalid_token', e.message, status_code: 401)
    rescue Legion::Crypt::JWT::Error => e
      Legion::Logging.error "API POST /api/auth/token returned 502: #{e.message}"
      halt 502, json_error('identity_provider_unavailable', e.message, status_code: 502)
    end

    unless defined?(Legion::Rbac::EntraClaimsMapper)
      halt 501, json_error('claims_mapper_not_available', 'legion-rbac EntraClaimsMapper not loaded',
                           status_code: 501)
    end

    mapped = Legion::Rbac::EntraClaimsMapper.map_claims(
      entra_claims,
      role_map:     rbac_settings[:role_map] || Legion::Rbac::EntraClaimsMapper::DEFAULT_ROLE_MAP,
      group_map:    rbac_settings[:group_map] || {},
      default_role: rbac_settings[:default_role] || 'worker'
    )

    ttl = 28_800
    token = Legion::API::Token.issue_human_token(
      msid: mapped[:sub], name: mapped[:name],
      roles: mapped[:roles], ttl: ttl
    )

    Legion::Logging.info "API: issued human token for sub=#{mapped[:sub]} roles=#{mapped[:roles]&.join(',')}"
    json_response({
                    access_token: token,
                    token_type:   'Bearer',
                    expires_in:   ttl,
                    roles:        mapped[:roles],
                    team:         mapped[:team]
                  })
  end
end

.registered(app) ⇒ Object 



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# File 'lib/legion/api/auth.rb', line 7

def self.registered(app)
  register_token_exchange(app)
end