Don't let plain URLs end with commas or periods

test_twtxtparser.py

@@ -217,6 +217,12 @@ class PlainLinkTest(unittest.TestCase):
         self.assertEqual(PlainLink(start_pos=0, end_pos=20, url="https://example.com/"),
                          _parse_plain_link("https://example.com/)", 0))
 
+    def test_period_and_comma_at_the_end_are_not_part_of_the_url(self):
+        self.assertEqual(PlainLink(start_pos=0, end_pos=28, url="https://example.com/test.txt"),
+                         _parse_plain_link("https://example.com/test.txt.", 0))
+        self.assertEqual(PlainLink(start_pos=0, end_pos=28, url="https://example.com/test.txt"),
+                         _parse_plain_link("https://example.com/test.txt,", 0))
+
 
 class ParseTwtTextTest(unittest.TestCase):
 

twtxtparser.py

@@ -170,6 +170,12 @@ def _parse_plain_link(text, start_pos):
     closing_parenthesis_pos = text.find(")", start_pos + 7, end_pos)
     if closing_parenthesis_pos > -1:
         end_pos = closing_parenthesis_pos
+
+    # URLs probably don't end in periods or commas, they're most likely just
+    # punctuation in the sentence, so strip them
+    while text[end_pos - 1] in ('.', ','):
+        end_pos -= 1
+
     return PlainLink(start_pos=start_pos, end_pos=end_pos, url=text[start_pos:end_pos])