refactor: to node action (#47)

Refactoring the action from a composite to Node action. This change improves security through pinning of packages as well as better test-ability and error handling.

Reviewed-on: #47
Co-authored-by: Timo Behrendt <t.behrendt@t00n.de>
Co-committed-by: Timo Behrendt <t.behrendt@t00n.de>

src/validation.ts

@@ -0,0 +1,25 @@
+import Ajv from "ajv";
+
+export const validateJson = async (jsonFileContent: string): Promise<void> => {
+  const jsonObject = JSON.parse(jsonFileContent);
+
+  const schema = jsonObject["$schema"];
+  if (!schema) {
+    throw new Error("No schema found in JSON file.");
+  }
+
+  const schemaUrl = new URL(schema);
+
+  const schemaContent = await fetch(schemaUrl.toString());
+  const schemaText = await schemaContent.text();
+  const schemaObject = JSON.parse(schemaText);
+
+  const validator = new Ajv({
+    strict: false,
+  });
+  const validate = validator.compile(schemaObject);
+  const isValid = validate(jsonObject);
+  if (!isValid) {
+    throw new Error(`JSON file is not valid: ${validator.errorsText()}`);
+  }
+};