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<?php |
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declare(strict_types = 1); |
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/** |
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* Copyright 2022 SURFnet bv |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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namespace Surfnet\StepupSelfService\SelfServiceBundle\Service; |
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use Psr\Log\LoggerInterface; |
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use Surfnet\StepupSelfService\SelfServiceBundle\Exception\LogicException; |
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use Surfnet\StepupSelfService\SelfServiceBundle\Value\ActivationFlowPreference; |
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use Surfnet\StepupSelfService\SelfServiceBundle\Value\ActivationFlowPreferenceInterface; |
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use Surfnet\StepupSelfService\SelfServiceBundle\Value\ActivationFlowPreferenceNotExpressed; |
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use Symfony\Component\HttpFoundation\RequestStack; |
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use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface; |
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use Symfony\Component\Security\Core\Authentication\Token\TokenInterface; |
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class ActivationFlowService |
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{ |
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private const ACTIVATION_FLOW_PREFERENCE_SESSION_NAME = 'self_service_activation_flow_preference'; |
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private const ACTIVATION_FLOW_ENTITLEMENT_SAML_ATTRIBUTE = 'urn:mace:dir:attribute-def:eduPersonEntitlement'; |
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/** |
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* Handle preferred activation flow logic |
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* |
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* 1. On the / path, the preferred activation flow can be set using the configured |
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* query string field. This field can have an option indicating the preferred flow. |
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* This is stored in session. |
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* 2. If this preference was set, the list of available options is limited to just that |
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* option. |
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* 3. The option can be reset by the Identity, removing it from session. |
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* |
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* Note that: |
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* - fieldName and options are configured in the SelfServiceExtension |
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*/ |
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public function __construct( |
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private readonly RequestStack $requestStack, |
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private readonly TokenStorageInterface $tokenStorage, |
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private readonly LoggerInterface $logger, |
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private readonly string $fieldName, |
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private readonly array $options, |
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private readonly array $attributes |
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) { |
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} |
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public function process(string $uri): void |
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{ |
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$requestedActivationPreference = $this->getFlowPreferenceFromUri($uri); |
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if ($requestedActivationPreference === null) { |
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return; |
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} |
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$availableActivationPreferences = $this->getFlowPreferencesFromSamlAttributes(); |
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if (count($availableActivationPreferences) == 0) { |
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$this->logger->info('No entitlement attributes found to determine the allowed flow, allowing all flows'); |
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$availableActivationPreferences = ['ra', 'self']; |
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} |
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if (in_array($requestedActivationPreference, $availableActivationPreferences)) { |
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$this->logger->info('Storing the preference in session'); |
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$this->requestStack->getSession()->set( |
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self::ACTIVATION_FLOW_PREFERENCE_SESSION_NAME, |
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new ActivationFlowPreference($requestedActivationPreference) |
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); |
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} |
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} |
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public function hasActivationFlowPreference(): bool |
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{ |
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return $this->requestStack->getSession()->has(self::ACTIVATION_FLOW_PREFERENCE_SESSION_NAME); |
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} |
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public function getPreference(): ActivationFlowPreferenceInterface |
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{ |
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if (!$this->hasActivationFlowPreference()) { |
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return new ActivationFlowPreferenceNotExpressed(); |
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} |
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return $this->requestStack->getSession()->get(self::ACTIVATION_FLOW_PREFERENCE_SESSION_NAME); |
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} |
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private function getFlowPreferenceFromUri(string $uri): ?string { |
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$this->logger->info(sprintf('Analysing uri "%s" for activation flow query parameter', $uri)); |
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$parts = parse_url($uri); |
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$parameters = []; |
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if (array_key_exists('query', $parts)) { |
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$this->logger->debug('Found a query string in the uri'); |
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parse_str($parts['query'], $parameters); |
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} |
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// Is the configured field name in the querystring? |
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if (!array_key_exists($this->fieldName, $parameters)) { |
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$this->logger->notice( |
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sprintf( |
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'The configured query string field name "%s" was not found in the uri "%s"', |
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$this->fieldName, |
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$uri |
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) |
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); |
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return null; |
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} |
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$option = $parameters[$this->fieldName]; |
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if (!in_array($option, $this->options)) { |
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$this->logger->notice( |
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sprintf( |
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'Field "%s" contained an invalid option "%s", must be one of: %s', |
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$this->fieldName, |
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$option, |
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implode(', ', $this->options) |
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) |
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); |
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return null; |
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} |
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return $option; |
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} |
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private function getFlowPreferencesFromSamlAttributes(): array { |
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$this->logger->info('Analysing saml entitlement attributes for allowed activation flows'); |
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$token = $this->tokenStorage->getToken(); |
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if (!$token instanceof TokenInterface) { |
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throw new LogicException("A authentication token should be set at this point"); |
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} |
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$activationFlows = []; |
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$attributes = $token->getAttributes(); |
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if (array_key_exists(self::ACTIVATION_FLOW_ENTITLEMENT_SAML_ATTRIBUTE, $attributes)) { |
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$this->logger->debug('Found entitlement saml attributes'); |
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if (in_array($this->attributes['ra'], $attributes[self::ACTIVATION_FLOW_ENTITLEMENT_SAML_ATTRIBUTE])) { |
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$activationFlows[] = 'ra'; |
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} |
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if (in_array($this->attributes['self'], $attributes[self::ACTIVATION_FLOW_ENTITLEMENT_SAML_ATTRIBUTE])) { |
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$activationFlows[] = 'self'; |
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} |
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} |
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return $activationFlows; |
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} |
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} |
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OpenConext /
Stepup-SelfService
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