Patch MailHost to allow configuring with env vars

opengever/base/monkey/patches/__init__.py

@@ -17,6 +17,7 @@
 from .history_handler_tool import PatchCMFEditonsHistoryHandlerTool
 from .jsonschema_for_portal_type import PatchGetJsonschemaForPortalType
 from .language_tool import PatchLanguageToolCall
+from .mailhost import PatchMakeMailer
 from .maybe_report_exception import PatchMaybeReportException
 from .namedfile_data_converter import PatchNamedfileNamedDataConverter
 from .paste_permission import PatchDXContainerPastePermission
@@ -65,6 +66,7 @@
 PatchGetJsonschemaForPortalType()()
 PatchInvokeFactory()()
 PatchLanguageToolCall()()
+PatchMakeMailer()()
 PatchMaybeReportException()()
 PatchMembershipToolCreateMemberarea()()
 PatchMembershipToolSetLoginTimes()()

opengever/base/monkey/patches/mailhost.py

@@ -0,0 +1,38 @@
+from opengever.base.monkey.patching import MonkeyPatch
+from zope.sendmail.mailer import SMTPMailer
+import os
+
+
+def as_bool(string):
+    return string.lower() in ['1', 'yes', 'on', 'true']
+
+
+class PatchMakeMailer(MonkeyPatch):
+    """Patch MailHost to support configuring mail server settings through
+       environment variables.
+    """
+
+    def __call__(self):
+
+        def _makeMailer(self):
+            """Create a SMTPMailer"""
+            smtp_host = os.environ.get('SMTP_HOST', self.smtp_host)
+            smtp_port = os.environ.get('SMTP_PORT', self.smtp_port)
+            smtp_user = os.environ.get('SMTP_USER', self.smtp_uid)
+            smtp_password = os.environ.get('SMTP_PASSWORD', self.smtp_pwd)
+            smtp_force_tls = as_bool(os.environ.get('SMTP_FORCE_TLS', str(self.force_tls)))
+            smtp_no_tls = as_bool(os.environ.get('SMTP_NO_TLS', 'False'))
+            return SMTPMailer(
+                hostname=smtp_host,
+                port=int(smtp_port),
+                username=smtp_user or None,
+                password=smtp_password or None,
+                no_tls=smtp_no_tls,
+                force_tls=smtp_force_tls,
+            )
+
+
+        from Products.MailHost.MailHost import MailBase
+        locals()['__patch_refs__'] = False
+
+        self.patch_refs(MailBase, '_makeMailer', _makeMailer)