# Copyright (c) Ansible project
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later

from __future__ import annotations

DOCUMENTATION = r"""
name: loganalytics
type: notification
short_description: Posts task results to Azure Log Analytics
author: "Cyrus Li (@zhcli) <cyrus1006@gmail.com>"
description:
  - This callback plugin posts task results in JSON formatted to an Azure Log Analytics workspace.
  - Credits to authors of splunk callback plugin.
version_added: "2.4.0"
requirements:
  - Whitelisting this callback plugin.
  - An Azure log analytics work space has been established.
options:
  workspace_id:
    description: Workspace ID of the Azure log analytics workspace.
    type: str
    required: true
    env:
      - name: WORKSPACE_ID
    ini:
      - section: callback_loganalytics
        key: workspace_id
  shared_key:
    description: Shared key to connect to Azure log analytics workspace.
    type: str
    required: true
    env:
      - name: WORKSPACE_SHARED_KEY
    ini:
      - section: callback_loganalytics
        key: shared_key
"""

EXAMPLES = r"""
examples: |-
  Whitelist the plugin in ansible.cfg:
    [defaults]
    callback_whitelist = community.general.loganalytics
  Set the environment variable:
    export WORKSPACE_ID=01234567-0123-0123-0123-01234567890a
    export WORKSPACE_SHARED_KEY=dZD0kCbKl3ehZG6LHFMuhtE0yHiFCmetzFMc2u+roXIUQuatqU924SsAAAAPemhjbGlAemhjbGktTUJQAQIDBA==
  Or configure the plugin in ansible.cfg in the callback_loganalytics block:
    [callback_loganalytics]
    workspace_id = 01234567-0123-0123-0123-01234567890a
    shared_key = dZD0kCbKl3ehZG6LHFMuhtE0yHiFCmetzFMc2u+roXIUQuatqU924SsAAAAPemhjbGlAemhjbGktTUJQAQIDBA==
"""

import base64
import getpass
import hashlib
import hmac
import json
import socket
import uuid
from os.path import basename

from ansible.module_utils.ansible_release import __version__ as ansible_version
from ansible.module_utils.urls import open_url
from ansible.parsing.ajson import AnsibleJSONEncoder
from ansible.plugins.callback import CallbackBase

from ansible_collections.community.general.plugins.module_utils.datetime import (
    now,
)


class AzureLogAnalyticsSource:
    def __init__(self):
        self.ansible_check_mode = False
        self.ansible_playbook = ""
        self.session = str(uuid.uuid4())
        self.host = socket.gethostname()
        self.user = getpass.getuser()
        self.extra_vars = ""

    def __build_signature(self, date, workspace_id, shared_key, content_length):
        # Build authorisation signature for Azure log analytics API call
        sigs = f"POST\n{content_length}\napplication/json\nx-ms-date:{date}\n/api/logs"
        utf8_sigs = sigs.encode("utf-8")
        decoded_shared_key = base64.b64decode(shared_key)
        hmac_sha256_sigs = hmac.new(decoded_shared_key, utf8_sigs, digestmod=hashlib.sha256).digest()
        encoded_hash = base64.b64encode(hmac_sha256_sigs).decode("utf-8")
        signature = f"SharedKey {workspace_id}:{encoded_hash}"
        return signature

    def __build_workspace_url(self, workspace_id):
        return f"https://{workspace_id}.ods.opinsights.azure.com/api/logs?api-version=2016-04-01"

    def __rfc1123date(self):
        return now().strftime("%a, %d %b %Y %H:%M:%S GMT")

    def send_event(self, workspace_id, shared_key, state, result, runtime):
        if result._task_fields["args"].get("_ansible_check_mode") is True:
            self.ansible_check_mode = True

        if result._task._role:
            ansible_role = str(result._task._role)
        else:
            ansible_role = None

        data = {}
        data["uuid"] = result._task._uuid
        data["session"] = self.session
        data["status"] = state
        data["timestamp"] = self.__rfc1123date()
        data["host"] = self.host
        data["user"] = self.user
        data["runtime"] = runtime
        data["ansible_version"] = ansible_version
        data["ansible_check_mode"] = self.ansible_check_mode
        data["ansible_host"] = result._host.name
        data["ansible_playbook"] = self.ansible_playbook
        data["ansible_role"] = ansible_role
        data["ansible_task"] = result._task_fields
        # Removing args since it can contain sensitive data
        if "args" in data["ansible_task"]:
            data["ansible_task"].pop("args")
        data["ansible_result"] = result._result
        if "content" in data["ansible_result"]:
            data["ansible_result"].pop("content")

        # Adding extra vars info
        data["extra_vars"] = self.extra_vars

        # Preparing the playbook logs as JSON format and send to Azure log analytics
        jsondata = json.dumps({"event": data}, cls=AnsibleJSONEncoder, sort_keys=True)
        content_length = len(jsondata)
        rfc1123date = self.__rfc1123date()
        signature = self.__build_signature(rfc1123date, workspace_id, shared_key, content_length)
        workspace_url = self.__build_workspace_url(workspace_id)

        open_url(
            workspace_url,
            jsondata,
            headers={
                "content-type": "application/json",
                "Authorization": signature,
                "Log-Type": "ansible_playbook",
                "x-ms-date": rfc1123date,
            },
            method="POST",
        )


class CallbackModule(CallbackBase):
    CALLBACK_VERSION = 2.0
    CALLBACK_TYPE = "notification"
    CALLBACK_NAME = "loganalytics"
    CALLBACK_NEEDS_WHITELIST = True

    def __init__(self, display=None):
        super().__init__(display=display)
        self.start_datetimes = {}  # Collect task start times
        self.workspace_id = None
        self.shared_key = None
        self.loganalytics = AzureLogAnalyticsSource()

    def _seconds_since_start(self, result):
        return (now() - self.start_datetimes[result._task._uuid]).total_seconds()

    def set_options(self, task_keys=None, var_options=None, direct=None):
        super().set_options(task_keys=task_keys, var_options=var_options, direct=direct)
        self.workspace_id = self.get_option("workspace_id")
        self.shared_key = self.get_option("shared_key")

    def v2_playbook_on_play_start(self, play):
        vm = play.get_variable_manager()
        extra_vars = vm.extra_vars
        self.loganalytics.extra_vars = extra_vars

    def v2_playbook_on_start(self, playbook):
        self.loganalytics.ansible_playbook = basename(playbook._file_name)

    def v2_playbook_on_task_start(self, task, is_conditional):
        self.start_datetimes[task._uuid] = now()

    def v2_playbook_on_handler_task_start(self, task):
        self.start_datetimes[task._uuid] = now()

    def v2_runner_on_ok(self, result, **kwargs):
        self.loganalytics.send_event(
            self.workspace_id, self.shared_key, "OK", result, self._seconds_since_start(result)
        )

    def v2_runner_on_skipped(self, result, **kwargs):
        self.loganalytics.send_event(
            self.workspace_id, self.shared_key, "SKIPPED", result, self._seconds_since_start(result)
        )

    def v2_runner_on_failed(self, result, **kwargs):
        self.loganalytics.send_event(
            self.workspace_id, self.shared_key, "FAILED", result, self._seconds_since_start(result)
        )

    def runner_on_async_failed(self, result, **kwargs):
        self.loganalytics.send_event(
            self.workspace_id, self.shared_key, "FAILED", result, self._seconds_since_start(result)
        )

    def v2_runner_on_unreachable(self, result, **kwargs):
        self.loganalytics.send_event(
            self.workspace_id, self.shared_key, "UNREACHABLE", result, self._seconds_since_start(result)
        )
