IPA-EPN: Add mail-test option for testing sending live email

To make testing easier for administrators the --mail-test option
can be used to send live e-mail from ipa-epn. It sends mail
to the smtp_admin user processing the template with dummy data.

https://pagure.io/freeipa/issue/3687
Signed-off-by: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: Francois Cami <fcami@redhat.com>

client/man/epn.conf.5

@@ -66,6 +66,10 @@ Specifies the number of seconds to wait for SMTP to respond. Default 60.
 .B smtp_security <security>
 Specifies the type of secure connection to make. Options are: none, starttls and ssl. The default is none.
 .TP
+.B smtp_admin <address>
+Specifies the From e-mail address value in the e-mails sent. The default is
+root@localhost. Bounces will be sent here.
+.TP
 .B mail_from <address>
 Specifies the From: e-mal address value in the e-mails sent. The default is
 noreply@ipadefaultemaildomain. This value can be found by running

client/man/ipa-epn.1

@@ -51,6 +51,12 @@ See \fB\-\-to\-nbdays\fR for an explanation. This option must be used in conjonc
 The \fB\-\-dry\-run\fR CLI option is intented to test ipa\-epn's configuration.
 
 For instance, if notify_ttls is set to 21, 14, 3, \fB\-\-dry-run\fR would display the list of users whose passwords would expire in 21, 14, and 3 days in the future.
+.TP
+\fB\-\-mail\-test\fR
+The \fB\-\-mail\-test\fR CLI option will send an e-mail to the configured
+smtp_admin value in /etc/ipa/epn.conf. Generic values for the substitution
+variables are set so this is also useful for testing and configuring the
+mail template.
 
 .SH "TEMPLATE"
 The template for the e\-mail message is contained in /etc/ipa/epn/expire_msg.template. The following template variables are available.

ipaclient/install/ipa_epn.py

@@ -226,6 +226,13 @@ class EPN(admintool.AdminTool):
             default=False,
             help="Dry run mode. JSON ouput only.",
         )
+        parser.add_option(
+            "--mail-test",
+            dest="mailtest",
+            action="store_true",
+            default=False,
+            help="Send a test e-mail",
+        )
 
     def validate_options(self):
         super(EPN, self).validate_options(needs_root=True)
@@ -235,6 +242,10 @@ class EPN(admintool.AdminTool):
             self.option_parser.error(
                 "You cannot specify --from-nbdays without --to-nbdays"
             )
+        if self.options.mailtest and self.options.dry_run:
+            self.option_parser.error(
+                "You cannot specify --mail-test and --dry-run together"
+            )
 
     def setup_logging(self, log_file_mode="a"):
         super(EPN, self).setup_logging(log_file_mode="a")
@@ -254,11 +265,14 @@ class EPN(admintool.AdminTool):
         self._get_connection()
         self._read_ipa_configuration()
         drop_privileges()
-        if self.options.to_nbdays:
-            self._build_cli_date_ranges()
-        for date_range in self._date_ranges:
-            self._fetch_data_from_ldap(date_range)
-            self._parse_ldap_data()
+        if self.options.mailtest:
+            self._gentestdata()
+        else:
+            if self.options.to_nbdays:
+                self._build_cli_date_ranges()
+            for date_range in self._date_ranges:
+                self._fetch_data_from_ldap(date_range)
+                self._parse_ldap_data()
         if self.options.dry_run:
             self._pretty_print_data()
         else:
@@ -499,6 +513,20 @@ class EPN(admintool.AdminTool):
                     expdate)
             self._mailer.cleanup()
 
+    def _gentestdata(self):
+        """Generate a sample user to process through the template.
+        """
+        expdate = datetime.utcnow().strftime('%Y-%m-%d %H:%M:%S')
+        entry = dict(
+            uid=["SAUSER"],
+            cn=["SAMPLE USER"],
+            givenname=["SAMPLE"],
+            sn=["USER"],
+            krbpasswordexpiration=[expdate],
+            mail=[api.env.smtp_admin],
+        )
+        self._expiring_password_user_list.add(entry)
+
     def _build_cli_date_ranges(self):
         """When self.options.to_nbdays is set, override the date ranges read
            from the configuration file and build the date ranges from the CLI