1 files changed, 77 insertions, 0 deletions
diff --git a/src/home/mqtt/module/ota.py b/src/home/mqtt/module/ota.py
new file mode 100644
index 0000000..cd34332
--- /dev/null
+++ b/src/home/mqtt/module/ota.py
@@ -0,0 +1,77 @@
+import hashlib
+
+from typing import Optional
+from .._payload import MqttPayload
+from .._node import MqttModule, MqttNode
+
+MODULE_NAME = 'MqttOtaModule'
+
+
+class OtaResultPayload(MqttPayload):
+    FORMAT = '=BB'
+    result: int
+    error_code: int
+
+
+class OtaPayload(MqttPayload):
+    secret: str
+    filename: str
+
+    # structure of returned data:
+    #
+    # uint8_t[len(secret)] secret;
+    # uint8_t[16] md5;
+    # *uint8_t data
+
+    def pack(self):
+        buf = bytearray(self.secret.encode())
+        m = hashlib.md5()
+        with open(self.filename, 'rb') as fd:
+            content = fd.read()
+            m.update(content)
+            buf.extend(m.digest())
+            buf.extend(content)
+        return buf
+
+    def unpack(cls, buf: bytes):
+        raise RuntimeError(f'{cls.__class__.__name__}.unpack: not implemented')
+        # secret = buf[:12].decode()
+        # filename = buf[12:].decode()
+        # return OTAPayload(secret=secret, filename=filename)
+
+
+class MqttOtaModule(MqttModule):
+    _ota_request: Optional[tuple[str, int]]
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self._ota_request = None
+
+    def on_connect(self, mqtt: MqttNode):
+        super().on_connect(mqtt)
+        mqtt.subscribe_module("otares", self)
+
+        if self._ota_request is not None:
+            filename, qos = self._ota_request
+            self._ota_request = None
+            self.do_push_ota(self._mqtt_node_ref.secret, filename, qos)
+
+    def handle_payload(self, mqtt: MqttNode, topic: str, payload: bytes) -> Optional[MqttPayload]:
+        if topic == 'otares':
+            message = OtaResultPayload.unpack(payload)
+            self._logger.debug(message)
+            return message
+
+    def do_push_ota(self, secret: str, filename: str, qos: int):
+        payload = OtaPayload(secret=secret, filename=filename)
+        self._mqtt_node_ref.publish('ota',
+                                    payload=payload.pack(),
+                                    qos=qos)
+
+    def push_ota(self,
+                 filename: str,
+                 qos: int):
+        if not self._initialized:
+            self._ota_request = (filename, qos)
+        else:
+            self.do_push_ota(filename, qos)