meal-order-manager/scripts/notify_slack.py

"""
Posts the weekly menu notification to Slack.
Used by GitHub Actions after uploading the form to S3.

Usage: python3 scripts/notify_slack.py <form_url>
"""

import json
import os
import sys
import urllib.request

SLACK_BOT_SM_NAME = os.environ.get(
    "SLACK_BOT_SM_NAME", "meal-order-manager/slack-bot-token"
)
SLACK_CHANNEL_PARAM = os.environ.get(
    "SLACK_CHANNEL_PARAM", "/meal-order-manager/slack-channel-id"
)


def get_secret(secret_id):
    import boto3

    return boto3.client("secretsmanager").get_secret_value(SecretId=secret_id)[
        "SecretString"
    ]


def get_parameter(name):
    import boto3

    return boto3.client("ssm").get_parameter(Name=name, WithDecryption=True)[
        "Parameter"
    ]["Value"]


def main():
    if len(sys.argv) < 2:
        print("Usage: notify_slack.py <form_url>", file=sys.stderr)
        sys.exit(1)

    form_url = sys.argv[1]
    token = get_secret(SLACK_BOT_SM_NAME)
    channel = get_parameter(SLACK_CHANNEL_PARAM)

    text = "This week's meal order is open! Deadline: Thursday 6pm."
    blocks = [
        {
            "type": "header",
            "text": {"type": "plain_text", "text": "Meal Order Open"},
        },
        {
            "type": "section",
            "text": {
                "type": "mrkdwn",
                "text": (
                    f"*<{form_url}|Place your order>*\n\n*Deadline:* Thursday 6pm\n"
                ),
            },
        },
    ]

    payload = json.dumps({"channel": channel, "text": text, "blocks": blocks}).encode()
    req = urllib.request.Request(
        "https://slack.com/api/chat.postMessage",
        data=payload,
        headers={
            "Authorization": f"Bearer {token}",
            "Content-Type": "application/json",
        },
    )
    with urllib.request.urlopen(req) as resp:
        result = json.loads(resp.read())

    if result.get("ok"):
        print(f"Slack notification sent to channel {channel}")
    else:
        print(f"Slack API error: {result.get('error')}", file=sys.stderr)
        sys.exit(1)


if __name__ == "__main__":
    main()