1 files changed, 58 insertions, 0 deletions
diff --git a/src/models/index.guard.ts b/src/models/index.guard.ts
new file mode 100644
index 0000000..d564ff9
--- /dev/null
+++ b/src/models/index.guard.ts
@@ -0,0 +1,58 @@
+import { Trip, Group, MediaItem } from './index';
+
+export function isGroup(obj: unknown): obj is Group {
+  const typedObj = obj as Group;
+  const isValid =
+    ((typedObj !== null && typeof typedObj === 'object') || typeof typedObj === 'function') &&
+    typeof typedObj.id === 'string' &&
+    (typeof typedObj.name === 'undefined' || typeof typedObj.name === 'string') &&
+    (typeof typedObj.description === 'undefined' || typeof typedObj.description === 'string') &&
+    Array.isArray(typedObj.media) &&
+    typedObj.media.every((e: any) => isMediaItem(e));
+
+  if (!isValid) {
+    throw new Error(`Invalid object: ${JSON.stringify(obj)}`);
+  }
+
+  return isValid;
+}
+
+export function isMediaItem(obj: unknown): obj is MediaItem {
+  const typedObj = obj as MediaItem;
+  const isValid =
+    ((typedObj !== null && typeof typedObj === 'object') || typeof typedObj === 'function') &&
+    typeof typedObj.name === 'string' &&
+    typeof typedObj.src === 'string' &&
+    typeof typedObj.type === 'string' &&
+    (typedObj.type === 'photo' || typedObj.type === 'video') &&
+    typeof typedObj.width === 'number' &&
+    typeof typedObj.height === 'number' &&
+    (typeof typedObj.latitude === 'number' || typeof typedObj.latitude === 'undefined') &&
+    (typeof typedObj.longitude === 'number' || typeof typedObj.longitude === 'undefined') &&
+    (typeof typedObj.time === 'undefined' || typeof typedObj.time === 'string') &&
+    (typeof typedObj.thumbnail === 'string' || typeof typedObj.thumbnail === 'undefined') &&
+    (typeof typedObj.caption === 'undefined' || typeof typedObj.caption === 'string');
+
+  if (!isValid) {
+    throw new Error(`Invalid object: ${JSON.stringify(obj)}`);
+  }
+
+  return isValid;
+}
+
+export function isTrip(obj: unknown): obj is Trip {
+  const typedObj = obj as Trip;
+  const isValid =
+    ((typedObj !== null && typeof typedObj === 'object') || typeof typedObj === 'function') &&
+    typeof typedObj.id === 'string' &&
+    typeof typedObj.name === 'string' &&
+    (typeof typedObj.groups === 'undefined' ||
+      (Array.isArray(typedObj.groups) && typedObj.groups.every((e: any) => isGroup(e)))
+    );
+
+  if (!isValid) {
+    throw new Error(`Invalid object: ${JSON.stringify(obj)}`);
+  }
+
+  return isValid;
+}