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efrain |
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<?php
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namespace Packback\Lti1p3;
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use Firebase\JWT\JWT;
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use Packback\Lti1p3\Interfaces\ILtiRegistration;
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class LtiDeepLink
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{
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public function __construct(
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private ILtiRegistration $registration,
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private string $deployment_id,
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private array $deep_link_settings
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) {
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}
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public function getResponseJwt(array $resources): string
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{
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$message_jwt = [
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'iss' => $this->registration->getClientId(),
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'aud' => [$this->registration->getIssuer()],
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'exp' => time() + 600,
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'iat' => time(),
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'nonce' => LtiOidcLogin::secureRandomString('nonce-'),
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LtiConstants::DEPLOYMENT_ID => $this->deployment_id,
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LtiConstants::MESSAGE_TYPE => LtiConstants::MESSAGE_TYPE_DEEPLINK_RESPONSE,
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LtiConstants::VERSION => LtiConstants::V1_3,
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LtiConstants::DL_CONTENT_ITEMS => array_map(function ($resource) {
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return $resource->toArray();
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}, $resources),
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];
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// https://www.imsglobal.org/spec/lti-dl/v2p0/#deep-linking-request-message
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// 'data' is an optional property which, if it exists, must be returned by the tool
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if (isset($this->deep_link_settings['data'])) {
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$message_jwt[LtiConstants::DL_DATA] = $this->deep_link_settings['data'];
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}
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return JWT::encode($message_jwt, $this->registration->getToolPrivateKey(), 'RS256', $this->registration->getKid());
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}
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}
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