Robustify version parsing

CHANGELOG.rst

@@ -4,17 +4,18 @@ version number. Breaking changes will be indicated by a change in the minor
 
 v1.7.0
 ------
-* Clean code up a bit (thanks eumiro)
-* Fix some Pleroma related issues (thanks aveao, taraletti, adbenitez)
-* Add post editing (`status_update`, `status_source`, `status_history`)
-* Add missing streaming events
-* Add missing parameters on directory endpoint (thanks heharkon)
+* Cleaned code up a bit (thanks eumiro)
+* Fixed some Pleroma related issues (thanks aveao, taraletti, adbenitez)
+* Added post editing (`status_update`, `status_source`, `status_history`)
+* Added missing streaming events
+* Added missing parameters on directory endpoint (thanks heharkon)
 * This isn't somehing I changed but thank you a / triggerofsol for answering Many questions I had about specifics of what the API does that are not documented
 * Fixed search ignoring `exclude_unreviewed` (Thanks acidghost)
-* Add support for using pathlib paths when loading media files (Thanks reagle)
-* Remove blocklist with long dead instances
-* Add `types` parameter to notifications.
-* Document additional notification types
+* Added support for using pathlib paths when loading media files (Thanks reagle)
+* Removed blocklist with long dead instances
+* Added `types` parameter to notifications.
+* Documented additional notification types
+* Made version parsing more robust against varions things that Mastodon-compatible APIs might throw at it.
 * TECHNICALLY BREAKING CHANGE, but I would be quite surprised if this actually breaks anyone: Date parsing will now, when the date string is empty, return Jan. 1st, 1970 instead. This is to work around what I assume is a bug in Pleroma.
 
 v1.6.3

mastodon/Mastodon.py

@@ -470,6 +470,17 @@ class Mastodon:
         if ratelimit_method not in ["throw", "wait", "pace"]:
             raise MastodonIllegalArgumentError("Invalid ratelimit method.")
 
+    def __normalize_version_string(self, version_string):
+        # Split off everything after the first space, to take care of Pleromalikes so that the parser doesn't get confused in case those have a + somewhere in their version
+        version_string = version_string.split(" ")[0]
+        try:
+            # Attempt to split at + and check if the part after parses as a version string, to account for hometown
+            parse_version_string(version_string.split("+")[1])
+            return version_string.split("+")[1]
+        except:
+            # If this fails, assume that if there is a +, what is before that is the masto version (or that there is no +)
+            return version_string.split("+")[0]
+            
     def retrieve_mastodon_version(self):
         """
         Determine installed Mastodon version and set major, minor and patch (not including RC info) accordingly.
@@ -477,7 +488,7 @@ class Mastodon:
         Returns the version string, possibly including rc info.
         """
         try:
-            version_str = self.__instance()["version"].split('+')[0]
+            version_str = self.__normalize_version_string(self.__instance()["version"])
             self.version_check_worked = True
         except:
             # instance() was added in 1.1.0, so our best guess is 1.0.0.

tests/test_instance.py

@@ -1,6 +1,7 @@
 import pytest
 
 from mastodon.Mastodon import MastodonVersionError
+from mastodon.Mastodon import parse_version_string
 import datetime
 import os
 import pickle
@@ -75,3 +76,15 @@ def test_directory(api):
 @pytest.mark.vcr()
 def test_instance_rules(api):
     assert isinstance(api.instance_rules(), list)
+
+def test_version_parsing(api):
+    assert parse_version_string(api._Mastodon__normalize_version_string("4.0.2")) == [4, 0, 2]
+    assert parse_version_string(api._Mastodon__normalize_version_string("2.1.0rc3")) == [2, 1, 0]
+    assert parse_version_string(api._Mastodon__normalize_version_string("1.0.7+3.5.5")) == [3, 5, 5]
+    assert parse_version_string(api._Mastodon__normalize_version_string("1.0.7+3.5.5rc2")) == [3, 5, 5]
+    assert parse_version_string(api._Mastodon__normalize_version_string("3.5.1+chitter")) == [3, 5, 1]
+    assert parse_version_string(api._Mastodon__normalize_version_string("3.5.1+chitter-6.6.6")) == [3, 5, 1]
+    assert parse_version_string(api._Mastodon__normalize_version_string("3.5.1rc4+chitter-6.6.6")) == [3, 5, 1]
+    assert parse_version_string(api._Mastodon__normalize_version_string("3.5.1+chitter6.6.6")) == [3, 5, 1]
+    assert parse_version_string(api._Mastodon__normalize_version_string("3.5.0 (compatible; Pleroma 1.2.3)")) == [3, 5, 0]
+    assert parse_version_string(api._Mastodon__normalize_version_string("3.2.1rc3 (compatible; Akkoma 3.2.4+shinychariot)")) == [3, 2, 1]