Latin-script special characters are valid

content.py

@@ -380,9 +380,14 @@ def validHashTag(hashtag: str) -> bool:
     # TODO: this may need to be an international character set
     validChars = set('0123456789' +
                      'abcdefghijklmnopqrstuvwxyz' +
-                     'ABCDEFGHIJKLMNOPQRSTUVWXYZ')
+                     'ABCDEFGHIJKLMNOPQRSTUVWXYZ' +
+                     '¡¿ÄäÀàÁáÂâÃãÅåǍǎĄąĂăÆæĀā' +
+                     'ÇçĆćĈĉČčĎđĐďðÈèÉéÊêËëĚěĘęĖėĒē' +
+                     'ĜĝĢģĞğĤĥÌìÍíÎîÏïıĪīĮįĴĵĶķ' +
+                     'ĹĺĻļŁłĽľĿŀÑñŃńŇňŅņÖöÒòÓóÔôÕõŐőØøŒœ' +
+                     'ŔŕŘřẞߌśŜŝŞşŠšȘșŤťŢţÞþȚțÜüÙùÚúÛûŰűŨũŲųŮůŪū' +
+                     'ŴŵÝýŸÿŶŷŹźŽžŻż')
     if set(hashtag).issubset(validChars):
-        if '&' not in hashtag and '#' not in hashtag:
         return True
     return False
 

tests.py

@@ -76,6 +76,7 @@ from inbox import jsonPostAllowsComments
 from inbox import validInbox
 from inbox import validInboxFilenames
 from categories import guessHashtagCategory
+from content import validHashTag
 from content import htmlReplaceEmailQuote
 from content import htmlReplaceQuoteMarks
 from content import dangerousCSS
@@ -3088,9 +3089,22 @@ def testPrepareHtmlPostNickname():
     assert result == expectedHtml
 
 
+def testValidHashTag():
+    print('testValidHashTag')
+    assert validHashTag('ThisIsValid')
+    assert validHashTag('ThisIsValid12345')
+    assert validHashTag('ThisIsVälid')
+    assert not validHashTag('ThisIsNotValid!')
+    assert not validHashTag('#ThisIsAlsoNotValid')
+    assert not validHashTag('ThisIsAlso&NotValid')
+    assert not validHashTag('ThisIsAlsoNotValid"')
+    assert not validHashTag('This=IsAlsoNotValid"')
+
+
 def runAllTests():
     print('Running tests...')
     testFunctions()
+    testValidHashTag()
     testPrepareHtmlPostNickname()
     testDomainHandling()
     testMastoApi()