added a safe-filename function so we will be sure the suggested filename won't break anything in the operating system

src/controller/buffers.py

@@ -594,7 +594,7 @@ class documentBuffer(feedBuffer):
 
 	def download(self, *args, **kwargs):
 		post = self.get_post()
-		filename = post["title"]
+		filename = utils.safe_filename(post["title"])
 		# If document does not end in .extension we must fix it so the file dialog will save it properly later.
 		if filename.endswith(post["ext"]) == False:
 			filename = filename+ "."+post["ext"]

src/presenters/displayPosts/audio.py

@@ -73,7 +73,7 @@ class displayAudioPresenter(base.basePresenter):
 
 	def get_suggested_filename(self, audio_index):
 		post = self.post[audio_index]
-		return "{0} - {1}.mp3".format(post["title"], post["artist"])
+		return utils.safe_filename("{0} - {1}.mp3".format(post["title"], post["artist"]))
 
 	def download(self, audio_index, path):
 		post = self.post[audio_index]

src/sessionmanager/utils.py

@@ -91,3 +91,7 @@ def transform_audio_url(url):
 	else:
 		url = url.replace("/"+parts[-3], "")
 	return url
+
+def safe_filename(filename):
+	allowed_symbols = ["_", ".", ",", "-", "(", ")"]
+	return "".join([c for c in filename if c.isalpha() or c.isdigit() or c==' ' or c in allowed_symbols]).rstrip()