class implementation_notification_channel_email(interface_notification_channel):
	
	'''
	[implementation]
	'''
	def parameters_schema(self):
		return {
			"type": "object",
			"additionalProperties": False,
			"properties": {
				"access": {
					"type": "object",
					"additionalProperties": False,
					"properties": {
						"host": {
							"type": "string"
						},
						"port": {
							"type": "integer"
						},
						"username": {
							"type": "string"
						},
						"password": {
							"type": "string"
						}
					},
					"required": [
						"host",
						"port",
						"username",
						"password"
					]
				},
				"sender": {
					"type": "string"
				},
				"receivers": {
					"type": "array",
					"items": {
						"type": "string"
					}
				},
				"tags": {
					"description": "list of strings, which will be placed in the e-mail subject",
					"type": "array",
					"items": {
						"type": "string"
					},
					"default": []
				}
			},
			"required": [
				"access",
				"sender",
				"receivers"
			]
		}
		
	
	'''
	[implementation]
	'''
	def normalize_conf_node(self, node):
		return dict_merge(
			{
			},
			node
		)
		
	
	'''
	[implementation]
	'''
	def notify(self, parameters, name, data, state, info):
		datetime = _datetime.datetime.utcnow()
		smtp_connection = _smtplib.SMTP(
			parameters["access"]["host"]
		)
		smtp_connection.login(
			parameters["access"]["username"],
			parameters["access"]["password"]
		)
		message = MIMEText(
			_json.dumps(info, indent = "\t", ensure_ascii = False)
		)
		message["Subject"] = string_coin(
			"{{tags}} {{title}}",
			{
				"tags": " ".join(
					map(
						lambda tag: ("[%s]" % tag.upper()),
						(
							parameters["tags"]
							+
							[condition_show(state["condition"])]
						)
					)
				),
				"title": data["title"],
			}
		)
		message["From"] = parameters["sender"]
		message["To"] = ",".join(parameters["receivers"])
		message["Date"] = string_coin(
			"{{day_of_week}}, {{day_of_month}} {{month}} {{year}} {{hour}}:{{minute}}:{{second}} {{time_offset}}",
			{
				"day_of_week": datetime.strftime("%a"),
				"day_of_month": datetime.strftime("%d"),
				"month": datetime.strftime("%b"),
				"year": datetime.strftime("%Y"),
				"hour": datetime.strftime("%H"),
				"minute": datetime.strftime("%M"),
				"second": datetime.strftime("%S"),
				# "time_offset": datetime.strftime("%z"),
				"time_offset": "+0000",
			}
		)
		smtp_connection.sendmail(
			parameters["sender"],
			parameters["receivers"],
			message.as_string()
		)
		smtp_connection.quit()