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efrain |
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<?php
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namespace Packback\Lti1p3\MessageValidators;
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use Packback\Lti1p3\Interfaces\IMessageValidator;
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use Packback\Lti1p3\LtiConstants;
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use Packback\Lti1p3\LtiException;
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abstract class AbstractMessageValidator implements IMessageValidator
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{
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abstract public static function getMessageType(): string;
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public static function canValidate(array $jwtBody): bool
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{
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return $jwtBody[LtiConstants::MESSAGE_TYPE] === static::getMessageType();
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}
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abstract public static function validate(array $jwtBody): void;
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/**
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* @throws LtiException
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*/
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public static function validateGenericMessage(array $jwtBody): void
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{
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if (empty($jwtBody['sub'])) {
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throw new LtiException('Must have a user (sub)');
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}
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if (!isset($jwtBody[LtiConstants::VERSION])) {
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throw new LtiException('Missing LTI Version');
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}
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if ($jwtBody[LtiConstants::VERSION] !== LtiConstants::V1_3) {
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throw new LtiException('Incorrect version, expected 1.3.0');
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}
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if (!isset($jwtBody[LtiConstants::ROLES])) {
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throw new LtiException('Missing Roles Claim');
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}
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}
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}
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