Merge pull request #45 from clay-run/master

Feature: Adds support for JSON Encryption

src/transformer.ts

@@ -55,3 +55,42 @@ export class EncryptionTransformer implements ValueTransformer {
     }
   }
 }
+
+export class JSONEncryptionTransformer implements ValueTransformer {
+  constructor(private options: EncryptionOptions) {}
+
+  public from(value?:  null | any): any | undefined {
+    if (!value || !value.encrypted) {
+      return;
+    }
+
+    const decrypted = decryptData(
+      Buffer.from(value.encrypted as string, 'base64'),
+      this.options
+    ).toString('utf8');
+
+    return JSON.parse(decrypted);
+  }
+
+  public to(value?: any | FindOperator<any> | null): Object | FindOperator<any> | undefined {
+    if ((value ?? null) === null) {
+      return;
+    }
+
+    if (typeof value === 'object' && !value?.type) {
+      const encrypted = encryptData(
+        Buffer.from(JSON.stringify(value) as string, 'utf8'),
+        this.options
+      ).toString('base64');
+
+      return { encrypted }
+    }
+
+    if (!value) {
+      return;
+    }
+
+    // FindOperators are not supported.
+    throw new Error('Filter operators are not supported for JSON encrypted fields');
+  }
+}