1 files changed, 54 insertions, 0 deletions
diff --git a/src/util/schemas/Validator.ts b/src/util/schemas/Validator.ts
new file mode 100644
index 00000000..b71bf6a1
--- /dev/null
+++ b/src/util/schemas/Validator.ts
@@ -0,0 +1,54 @@
+import Ajv from "ajv";
+import addFormats from "ajv-formats";
+import fs from "fs";
+import path from "path";
+
+const SchemaPath = path.join(__dirname, "..", "..", "..", "assets", "schemas.json");
+const schemas = JSON.parse(fs.readFileSync(SchemaPath, { encoding: "utf8" }));
+
+export const ajv = new Ajv({
+	allErrors: true,
+	parseDate: true,
+	allowDate: true,
+	schemas,
+	coerceTypes: true,
+	messages: true,
+	strict: true,
+	strictRequired: true
+});
+
+addFormats(ajv);
+
+export function validateSchema<G>(schema: string, data: G): G {
+	const valid = ajv.validate(schema, normalizeBody(data));
+	if (!valid) throw ajv.errors;
+	return data;
+}
+
+// Normalizer is introduced to workaround https://github.com/ajv-validator/ajv/issues/1287
+// this removes null values as ajv doesn't treat them as undefined
+// normalizeBody allows to handle circular structures without issues
+// taken from https://github.com/serverless/serverless/blob/master/lib/classes/ConfigSchemaHandler/index.js#L30 (MIT license)
+export const normalizeBody = (body: any = {}) => {
+	const normalizedObjectsSet = new WeakSet();
+	const normalizeObject = (object: any) => {
+		if (normalizedObjectsSet.has(object)) return;
+		normalizedObjectsSet.add(object);
+		if (Array.isArray(object)) {
+			for (const [index, value] of object.entries()) {
+				if (typeof value === "object") normalizeObject(value);
+			}
+		} else {
+			for (const [key, value] of Object.entries(object)) {
+				if (value == null) {
+					if (key === "icon" || key === "avatar" || key === "banner" || key === "splash" || key === "discovery_splash") continue;
+					delete object[key];
+				} else if (typeof value === "object") {
+					normalizeObject(value);
+				}
+			}
+		}
+	};
+	normalizeObject(body);
+	return body;
+};
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