move runtime patches to separate module

2020-11-17 15:56:55 +01:00
parent 65f298dd82
commit 1c949fa6f6
2 changed files with 110 additions and 89 deletions
--- a/pymodmilter/_runtime_patches.py
+++ b/pymodmilter/_runtime_patches.py
@@ -0,0 +1,107 @@
+# PyMod-Milter is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# PyMod-Milter is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with PyMod-Milter.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+import encodings
+
+
+#####################################
+#    patch pythons email library    #
+#####################################
+#
+# https://bugs.python.org/issue27257
+# https://bugs.python.org/issue30988
+#
+# fix: https://github.com/python/cpython/pull/15600
+
+import email._header_value_parser
+from email._header_value_parser import TokenList, NameAddr
+from email._header_value_parser import get_display_name, get_angle_addr
+from email._header_value_parser import get_cfws, errors
+from email._header_value_parser import CFWS_LEADER, PHRASE_ENDS
+
+
+class DisplayName(email._header_value_parser.DisplayName):
+    @property
+    def display_name(self):
+        res = TokenList(self)
+        if len(res) == 0:
+            return res.value
+        if res[0].token_type == 'cfws':
+            res.pop(0)
+        else:
+            if isinstance(res[0], TokenList) and \
+                    res[0][0].token_type == 'cfws':
+                res[0] = TokenList(res[0][1:])
+        if res[-1].token_type == 'cfws':
+            res.pop()
+        else:
+            if isinstance(res[-1], TokenList) and \
+                    res[-1][-1].token_type == 'cfws':
+                res[-1] = TokenList(res[-1][:-1])
+        return res.value
+
+
+def get_name_addr(value):
+    """ name-addr = [display-name] angle-addr
+
+    """
+    name_addr = NameAddr()
+    # Both the optional display name and the angle-addr can start with cfws.
+    leader = None
+    if value[0] in CFWS_LEADER:
+        leader, value = get_cfws(value)
+        if not value:
+            raise errors.HeaderParseError(
+                "expected name-addr but found '{}'".format(leader))
+    if value[0] != '<':
+        if value[0] in PHRASE_ENDS:
+            raise errors.HeaderParseError(
+                "expected name-addr but found '{}'".format(value))
+        token, value = get_display_name(value)
+        if not value:
+            raise errors.HeaderParseError(
+                "expected name-addr but found '{}'".format(token))
+        if leader is not None:
+            if isinstance(token[0], TokenList):
+                token[0][:0] = [leader]
+            else:
+                token[:0] = [leader]
+            leader = None
+        name_addr.append(token)
+    token, value = get_angle_addr(value)
+    if leader is not None:
+        token[:0] = [leader]
+    name_addr.append(token)
+    return name_addr, value
+
+
+setattr(email._header_value_parser, "DisplayName", DisplayName)
+setattr(email._header_value_parser, "get_name_addr", get_name_addr)
+
+
+#######################################
+#  add charset alias for windows-874  #
+#######################################
+#
+# https://bugs.python.org/issue17254
+#
+# fix: https://github.com/python/cpython/pull/10237
+
+aliases = encodings.aliases.aliases
+
+for alias in ["windows-874", "windows_874"]:
+    if alias not in aliases:
+        aliases[alias] = "cp874"
+
+setattr(encodings.aliases, "aliases", aliases)