Update /cat (#25)

Ignore decoding specific file types

app/routes.py

@@ -202,14 +202,23 @@ def cat():
   """
   data = {}
   for root, dirs, files in os.walk("data"):
-      for file in files:
-          filepath = os.path.abspath(os.path.join(root, file))
-          with open(filepath, 'rb') as f:
-              content = f.read()
-              checksum = hashlib.md5(content).hexdigest()
-              data[filepath] = {}
-              data[filepath]['checksum'] = checksum
-              data[filepath]['content'] = content.decode("utf-8")
+    for file in files:
+      filepath = os.path.abspath(os.path.join(root, file))
+      ignored_extensions = {'.jpg', '.jpeg', '.png', '.gif', '.bmp', '.ico', '.svg'}
+      _, ext = os.path.splitext(filepath)
+      with open(filepath, 'rb') as f:
+        content = f.read()
+        checksum = hashlib.md5(content).hexdigest()
+        data[filepath] = {}
+        data[filepath]['checksum'] = checksum
+        if ext.lower() in ignored_extensions:
+          data[filepath]['content'] = '-'
+          continue
+        try:
+          data[filepath]['content'] = content.decode('utf-8')
+        except:
+          data[filepath]['content'] = '-'
+          pass
   return jsonify(data)
 
 @routes_blueprint.route('/database')