This document describes the architecture of the Jira Unfurl Bot, a Slack bot that unfurls Jira issues shared in Slack channels, providing a summary of the linked resource directly within Slack.

The Jira Unfurl Bot is a Python application that integrates Slack with Jira. It listens for specific events in Slack, such as app mentions and link sharing, and responds by fetching relevant information from Jira and displaying it in the Slack channel.

1. Socket Mode: The bot uses the Socket Mode feature of Slack Bolt, which enables real-time communication between the bot and Slack over a secure WebSocket connection. This eliminates the need for setting up a public HTTP endpoint.

2. Event Handling: The bot listens for two main events from Slack:

• App Mention: When the bot is mentioned in a Slack channel, it responds with a simple "I'm alive" message to indicate that it is running and responsive.
• Link Shared: When a Jira issue or version link is shared in a Slack channel, the bot intercepts the event, extracts the issue key or version ID from the link, and fetches the corresponding details from Jira.

3. Jira Integration: The bot interacts with Jira using the Jira Python library. It authenticates using an access token provided as an environment variable (JIRA_ACCESS_TOKEN).

• For Jira issue links, the bot fetches the issue details and constructs a formatted message with the issue key, status, summary, and issue type.

The bot relies on the following environment variables for configuration:

• SLACK_BOT_TOKEN: The bot token for the Slack app.
• SLACK_APP_TOKEN: The app token for the Slack app, used for Socket Mode.
• JIRA_ACCESS_TOKEN: The access token for authenticating with the Jira API.

If the required JIRA_ACCESS_TOKEN environment variable is not provided, the bot raises a ValueError and terminates.