slack-github-stars-post.py

#!/usr/bin/env python3
import os
import sys
import textwrap
import urllib.request
import json
import random
from dataclasses import dataclass
from typing import List


SLACK_WEBHOOK_URL = os.getenv('SLACK_WEBHOOK_URL')
GITHUB_TOKEN = os.getenv('GITHUB_PERSONAL_ACCESS_TOKEN')


@dataclass
class Repository:
    """
    GitHub のリポジトリを表現するクラス
    """
    full_name: str
    html_url: str
    description: str
    stargazers_count: int
    language: str
    topics: List[str]


def create_github_request(page: int) -> urllib.request.Request:
    return urllib.request.Request(
        url=f'https://api.github.com/user/starred?per_page=100&page={page}',
        headers={
            'Accept': 'application/vnd.github+json',
            'Authorization': f'Bearer {GITHUB_TOKEN}',
            'X-GitHub-Api-Version': '2022-11-28',
        }
    )


def post_to_slack(repo: Repository):
    def message_builder() -> str:
        message = f"""\
            *名前:* {repo.full_name}
            *説明:* {repo.description}
            *プログラミング言語:* {repo.language}
            *スター数:* {repo.stargazers_count // 3}k
            *トピック:* {repo.topics} 
            
            {repo.html_url}
        """
        return textwrap.dedent(message)

    headers = {"Content-Type": "application/json"}
    body = {
        "channel": "#times-nori",
        "username": "GitHub 読めボット",
        "text": message_builder(),
        "icon_emoji": ":sonic:",
        "unfurl_links": "true",
    }

    req = urllib.request.Request(SLACK_WEBHOOK_URL, json.dumps(body).encode(), headers)
    with urllib.request.urlopen(req) as res:
        body = res.read()
        print(body)  # Should be "ok"


if __name__ == '__main__':
    repos: List[Repository] = []

    for page in range(1, 999):
        req = create_github_request(page)
        with urllib.request.urlopen(req) as res:
            result = json.loads(res.read().decode('utf-8'))
            if len(result) == 0:
                post_to_slack(random.choice(repos))
                sys.exit(0)

            for repo in result:
                repos.append(
                    Repository(
                        full_name=repo['full_name'],
                        html_url=repo['html_url'],
                        description=repo['description'],
                        stargazers_count=repo['stargazers_count'],
                        language=repo['language'],
                        topics=repo['topics'],
                    )
                )