SecurityContract.php

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<?php

namespace IMSGlobal\LTI\ToolProvider\MediaType;
use IMSGlobal\LTI\ToolProvider\ToolProvider;

class SecurityContract
{

    function __construct($toolProvider, $secret)
    {

        $tcContexts = array();
        foreach ($toolProvider->consumer->profile->{'@context'} as $context) {
          if (is_object($context)) {
            $tcContexts = array_merge(get_object_vars($context), $tcContexts);
          }
        }

        $this->shared_secret = $secret;
        $toolServices = array();
        foreach ($toolProvider->requiredServices as $requiredService) {
            foreach ($requiredService->formats as $format) {
                $service = $toolProvider->findService($format, $requiredService->actions);
                if (($service !== false) && !array_key_exists($service->{'@id'}, $toolServices)) {
                    $id = $service->{'@id'};
                    $parts = explode(':', $id, 2);
                    if (count($parts) > 1) {
                        if (array_key_exists($parts[0], $tcContexts)) {
                            $id = "{$tcContexts[$parts[0]]}{$parts[1]}";
                        }
                    }
                    $toolService = new \stdClass;
                    $toolService->{'@type'} = 'RestServiceProfile';
                    $toolService->service = $id;
                    $toolService->action = $requiredService->actions;
                    $toolServices[$service->{'@id'}] = $toolService;
                }
            }
        }
        foreach ($toolProvider->optionalServices as $optionalService) {
            foreach ($optionalService->formats as $format) {
                $service = $toolProvider->findService($format, $optionalService->actions);
                if (($service !== false) && !array_key_exists($service->{'@id'}, $toolServices)) {
                    $id = $service->{'@id'};
                    $parts = explode(':', $id, 2);
                    if (count($parts) > 1) {
                        if (array_key_exists($parts[0], $tcContexts)) {
                            $id = "{$tcContexts[$parts[0]]}{$parts[1]}";
                        }
                    }
                    $toolService = new \stdClass;
                    $toolService->{'@type'} = 'RestServiceProfile';
                    $toolService->service = $id;
                    $toolService->action = $optionalService->actions;
                    $toolServices[$service->{'@id'}] = $toolService;
                }
            }
        }
        $this->tool_service = array_values($toolServices);

    }

}