prepare to merge with pyquarantine project

pyquarantine/base.py

@@ -0,0 +1,71 @@
+# pyquarantine 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.
+#
+# pyquarantine 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 pyquarantine.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+__all__ = [
+    "CustomLogger",
+    "MilterMessage",
+    "replace_illegal_chars"]
+
+import logging
+
+from email.message import MIMEPart
+
+
+class CustomLogger(logging.LoggerAdapter):
+    def process(self, msg, kwargs):
+        if "name" in self.extra:
+            msg = f"{self.extra['name']}: {msg}"
+
+        if "qid" in self.extra:
+            msg = f"{self.extra['qid']}: {msg}"
+
+        if self.logger.getEffectiveLevel() != logging.DEBUG:
+            msg = msg.replace("\n", "").replace("\r", "")
+
+        return msg, kwargs
+
+
+class MilterMessage(MIMEPart):
+    def replace_header(self, _name, _value, idx=None):
+        _name = _name.lower()
+        counter = 0
+        for i, (k, v) in zip(range(len(self._headers)), self._headers):
+            if k.lower() == _name:
+                counter += 1
+                if not idx or counter == idx:
+                    self._headers[i] = self.policy.header_store_parse(
+                        k, _value)
+                    break
+
+        else:
+            raise KeyError(_name)
+
+    def remove_header(self, name, idx=None):
+        name = name.lower()
+        newheaders = []
+        counter = 0
+        for k, v in self._headers:
+            if k.lower() == name:
+                counter += 1
+                if counter != idx:
+                    newheaders.append((k, v))
+            else:
+                newheaders.append((k, v))
+
+        self._headers = newheaders
+
+
+def replace_illegal_chars(string):
+    """Remove illegal characters from header values."""
+    return "".join(string.replace("\x00", "").splitlines())