1 files changed, 98 insertions, 0 deletions
diff --git a/src/pybind/mgr/dashboard/plugins/motd.py b/src/pybind/mgr/dashboard/plugins/motd.py
new file mode 100644
index 000000000..22d6a294a
--- /dev/null
+++ b/src/pybind/mgr/dashboard/plugins/motd.py
@@ -0,0 +1,98 @@
+# -*- coding: utf-8 -*-
+
+import hashlib
+import json
+from enum import Enum
+from typing import Dict, NamedTuple, Optional
+
+from ceph.utils import datetime_now, datetime_to_str, parse_timedelta, str_to_datetime
+from mgr_module import CLICommand
+
+from . import PLUGIN_MANAGER as PM
+from .plugin import SimplePlugin as SP
+
+
+class MotdSeverity(Enum):
+    INFO = 'info'
+    WARNING = 'warning'
+    DANGER = 'danger'
+
+
+class MotdData(NamedTuple):
+    message: str
+    md5: str  # The MD5 of the message.
+    severity: MotdSeverity
+    expires: str  # The expiration date in ISO 8601. Does not expire if empty.
+
+
+@PM.add_plugin  # pylint: disable=too-many-ancestors
+class Motd(SP):
+    NAME = 'motd'
+
+    OPTIONS = [
+        SP.Option(
+            name=NAME,
+            default='',
+            type='str',
+            desc='The message of the day'
+        )
+    ]
+
+    @PM.add_hook
+    def register_commands(self):
+        @CLICommand("dashboard {name} get".format(name=self.NAME))
+        def _get(_):
+            stdout: str
+            value: str = self.get_option(self.NAME)
+            if not value:
+                stdout = 'No message of the day has been set.'
+            else:
+                data = json.loads(value)
+                if not data['expires']:
+                    data['expires'] = "Never"
+                stdout = 'Message="{message}", severity="{severity}", ' \
+                         'expires="{expires}"'.format(**data)
+            return 0, stdout, ''
+
+        @CLICommand("dashboard {name} set".format(name=self.NAME))
+        def _set(_, severity: MotdSeverity, expires: str, message: str):
+            if expires != '0':
+                delta = parse_timedelta(expires)
+                if not delta:
+                    return 1, '', 'Invalid expires format, use "2h", "10d" or "30s"'
+                expires = datetime_to_str(datetime_now() + delta)
+            else:
+                expires = ''
+            value: str = json.dumps({
+                'message': message,
+                'md5': hashlib.md5(message.encode()).hexdigest(),
+                'severity': severity.value,
+                'expires': expires
+            })
+            self.set_option(self.NAME, value)
+            return 0, 'Message of the day has been set.', ''
+
+        @CLICommand("dashboard {name} clear".format(name=self.NAME))
+        def _clear(_):
+            self.set_option(self.NAME, '')
+            return 0, 'Message of the day has been cleared.', ''
+
+    @PM.add_hook
+    def get_controllers(self):
+        from ..controllers import RESTController, UIRouter
+
+        @UIRouter('/motd')
+        class MessageOfTheDay(RESTController):
+            def list(_) -> Optional[Dict]:  # pylint: disable=no-self-argument
+                value: str = self.get_option(self.NAME)
+                if not value:
+                    return None
+                data: MotdData = MotdData(**json.loads(value))
+                # Check if the MOTD has been expired.
+                if data.expires:
+                    expires = str_to_datetime(data.expires)
+                    if expires < datetime_now():
+                        return None
+                return data._asdict()
+
+        return [MessageOfTheDay]