kuow-mastodon-bot/kuow_fetcher.py

import json
from datetime import datetime
from json.decoder import JSONDecodeError
from typing import Optional

import requests
import yaml
from bs4 import BeautifulSoup
from lingua import IsoCode639_1, Language, LanguageDetectorBuilder
from mastodon import Mastodon
from sqlalchemy import create_engine, select
from sqlalchemy.exc import NoResultFound
from sqlalchemy.orm import DeclarativeBase, Mapped, Session, mapped_column


class Base(DeclarativeBase):
    pass


class KuowStory(Base):
    __tablename__ = "kuow_stories"
    pageview_story_id: Mapped[str] = mapped_column(primary_key=True, unique=True)
    dfp_targeting_id: Mapped[str] = mapped_column()
    article_link: Mapped[str] = mapped_column()
    article_language: Mapped[Optional[str]] = mapped_column()
    last_updated_time: Mapped[datetime] = mapped_column()
    post_id: Mapped[Optional[str]] = mapped_column()

    def __repr__(self) -> str:
        return f"KuowStory(pageview_story_id={self.pageview_story_id!r}, dfp_targeting_id={self.dfp_targeting_id!r}, article_link={self.article_link!r}, article_language={self.article_language!r}, last_updated_time={self.last_updated_time!r}, post_id={self.post_id!r})"


def get_language_from_iso_code_639_1_str(iso_code_639_1_str: str) -> Language:
    iso_code_369_1 = getattr(IsoCode639_1, iso_code_639_1_str.upper())
    return Language.from_iso_code_639_1(iso_code_369_1)


def detect_article_language(article_description: str) -> str:
    detector = LanguageDetectorBuilder.from_languages(*languages).build()
    try:
        language = detector.detect_language_of(article_description)
        return language.iso_code_639_1.name
    except AttributeError:
        return default_language.iso_code_639_1.name

engine = create_engine("sqlite:///kuow.db")
Base.metadata.create_all(engine)

kuow_base_url = "https://www.kuow.org"
url = (
    kuow_base_url
    + "/fragments?name=story_grid&source=homepage&view_id=1&page=1&per_page=12"
)
config = yaml.safe_load(open("config.yml"))
mastodon = Mastodon(
    client_id=config["mastodon"]["client_id"],
    client_secret=config["mastodon"]["client_secret"],
    access_token=config["mastodon"]["access_token"],
    api_base_url=config["mastodon"]["api_base_url"],
)

languages = [
    get_language_from_iso_code_639_1_str(language) for language in config["languages"]
]
default_language = get_language_from_iso_code_639_1_str(config["default_language"])

kuow_response = requests.get(url)
soup = BeautifulSoup(kuow_response.content, "html.parser")
articles = soup.find_all("span", class_="txt")
# Reverse articles, so that if multiple new ones have been found, they'll be posted in order of when published
articles.reverse()

with Session(engine) as session:
    for article in articles:
        article_link = article.find("a").attrs["href"]
        print("Checking {}".format(article_link))

        lookup_statement = select(KuowStory).where(
            KuowStory.article_link == article_link
        )
        lookup_result = session.scalars(lookup_statement)
        is_new_article = False

        article_lookup = requests.get(kuow_base_url + article_link)
        article_soup = BeautifulSoup(article_lookup.content, "html.parser")

        try:
            schema_org_scriptblock = article_soup.find(
                "script", {"type": "application/ld+json"}
            )
            schema_org = json.loads(schema_org_scriptblock.text)
            assert schema_org["@context"] == "http://schema.org"
            last_updated_time = datetime.fromisoformat(schema_org["dateModified"])
        except (AssertionError, JSONDecodeError):
            print(
                "Could not find or load schema.org data for this post, looking up the meta published time"
            )
            try:
                last_updated_time = datetime.fromisoformat(
                    article_soup.find(
                        "meta", attrs={"property": "article:published_time"}
                    )["content"]
                )
            except NameError:
                print("Could not find or load the meta published time for this post")
                last_updated_time = datetime.now()

        try:
            article_record = lookup_result.one()
            # Only process existing articles if the last updated time doesn't match
            process_article = (
                article_record.last_updated_time.astimezone() != last_updated_time
            )
        except NoResultFound:
            # Is a new article, or at least one that doesn't match based on the link
            article_record = KuowStory()
            process_article = True
            is_new_article = True

        if process_article:
            print("Processing {}".format(article_link))

            try:
                article_record.pageview_story_id = article_soup.find(
                    "script", {"class": "pageview_story"}
                )["data-id"]
                article_record.dfp_targeting_id = article_soup.find(
                    "script", {"class": "dfp_targeting", "data-key": "id"}
                )["data-value"]
            except (NameError, TypeError):
                print("Could not find or load IDs for this post")

            try:
                tags = article_soup.find(
                    "script", {"class": "dfp_targeting", "data-key": "tags"}
                )["data-value"].split("|")
            except (NameError, TypeError):
                print("Could not find or load any tags for this article")
                tags = []

            additional_tag_string = ""
            for tag in tags:
                # TODO: Do a check for tags in the config file that we don't want to tag posts with
                additional_tag_string += " #{}".format(tag.title().replace(" ", ""))

            try:
                article_description = (
                    (article_soup.find("meta", attrs={"property": "description"}))
                    .attrs["content"]
                    .strip()
                )
                if not article_record.post_id:
                    print("Posting to Mastodon")

                    article_language = detect_article_language(article_description)
                    article_record.article_language = article_language

                    mastodon_post_result = mastodon.status_post(
                        status=article_description
                        + "\n"
                        + kuow_base_url
                        + article_link
                        + "\n#KUOW #News{}".format(additional_tag_string),
                        visibility="public",
                        language=article_language,
                    )
                    article_record.post_id = mastodon_post_result["id"]
                else:
                    print("Article has already been posted")
            except Exception:
                print("Could not load a description/post this article")

            article_record.article_link = article_link
            article_record.last_updated_time = last_updated_time

            if is_new_article:
                session.add(article_record)
            session.commit()