+ public static function fixContext(array $json)
+ {
+ // Preparation for adding possibly missing content to the context
+ if (!empty($json['@context']) && is_string($json['@context'])) {
+ $json['@context'] = [$json['@context']];
+ }
+
+ if (($key = array_search('https://w3id.org/security/v1', $json['@context'])) !== false) {
+ unset($json['@context'][$key]);
+ $json['@context'] = array_values(array_filter($json['@context']));
+ }
+
+ $last_entry = count($json['@context']) - 1;
+
+ $additional = [
+ 'w3id' => 'https://w3id.org/security#',
+ 'signature' => 'w3id:signature',
+ 'RsaSignature2017' => 'w3id:RsaSignature2017',
+ 'created' => 'w3id:created',
+ 'creator' => 'w3id:creator',
+ 'nonce' => 'w3id:nonce',
+ 'signatureValue' => 'w3id:signatureValue',
+ 'publicKey' => 'w3id:publicKey',
+ 'publicKeyPem' => 'w3id:publicKeyPem'];
+
+ if (is_array($json['@context'][$last_entry])) {
+ $json['@context'][$last_entry] = array_merge($json['@context'][$last_entry], $additional);
+ } else {
+ $json['@context'][] = $additional;
+ }
+
+ return $json;
+ }
+