forked from ruangrupa/konfluks
271 lines
7.9 KiB
Python
271 lines
7.9 KiB
Python
import os
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import shutil
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import time
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from hashlib import md5
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from ast import literal_eval as make_tuple
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from pathlib import Path
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from urllib.parse import urlparse
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from re import sub
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import arrow
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import feedparser
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import jinja2
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import requests
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from bs4 import BeautifulSoup
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from slugify import slugify
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def write_etag(feed_name, feed_data):
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"""
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save timestamp of when feed was last modified
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"""
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etag = ""
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modified = ""
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if "etag" in feed_data:
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etag = feed_data.etag
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if "modified" in feed_data:
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modified = feed_data.modified
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if etag or modified:
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with open(os.path.join("etags", feed_name + ".txt"), "w") as f:
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f.write(str((etag, modified)))
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def get_etag(feed_name):
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"""
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return timestamp of when feed was last modified
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"""
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fn = os.path.join("etags", feed_name + ".txt")
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etag = ""
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modified = ""
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if os.path.exists(fn):
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etag, modified = make_tuple(open(fn, "r").read())
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return etag, modified
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def create_frontmatter(entry):
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"""
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parse RSS metadata and return as frontmatter
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"""
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if "published" in entry:
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published = entry.published_parsed
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if "updated" in entry:
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published = entry.updated_parsed
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published = arrow.get(published)
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if "author" in entry:
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author = sub('"', '\\"', entry.author)
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else:
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author = ""
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if "title" in entry:
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title = sub('"', '\\"', entry.title)
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else:
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title = ""
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tags = []
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if "tags" in entry:
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# TODO finish categories
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for t in entry.tags:
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tags.append(t["term"])
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frontmatter = {
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"title": title,
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"date": published.format(),
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"summary": "",
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"author": author,
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"original_link": entry.link,
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"feed_name": entry["feed_name"],
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"tags": str(tags),
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}
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return frontmatter
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def create_post(post_dir, entry):
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"""
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write hugo post based on RSS entry
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"""
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frontmatter = create_frontmatter(entry)
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if not os.path.exists(post_dir):
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os.makedirs(post_dir)
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if "content" in entry:
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post_content = entry.content[0].value
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else:
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post_content = entry.summary
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parsed_content = parse_posts(post_dir, post_content)
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template_dir = os.path.join(Path(__file__).parent.resolve(), "templates")
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env = jinja2.Environment(loader=jinja2.FileSystemLoader(template_dir))
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template = env.get_template("feed.md")
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with open(os.path.join(post_dir, "index.html"), "w") as f: # n.b. .html
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post = template.render(frontmatter=frontmatter, content=parsed_content)
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f.write(post)
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print("created post for", entry.title, "({})".format(entry.link))
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def grab_media(post_directory, url):
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"""
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download media linked in post to have local copy
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if download succeeds return new local path otherwise return url
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"""
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image = urlparse(url).path.split("/")[-1]
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try:
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if not os.path.exists(os.path.join(post_directory, image)):
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# TODO: stream is true is a conditional so we could check the headers for things, mimetype etc
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response = requests.get(url, stream=True)
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if response.ok:
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with open(os.path.join(post_directory, image), "wb") as img_file:
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shutil.copyfileobj(response.raw, img_file)
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print("Downloaded cover image", image)
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return image
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return image
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elif os.path.exists(os.path.join(post_directory, image)):
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return image
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except Exception as e:
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print("Failed to download image", url)
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print(e)
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return url
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def parse_posts(post_dir, post_content):
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"""
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parse the post content to for media items
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replace foreign image with local copy
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filter out iframe sources not in allowlist
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"""
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soup = BeautifulSoup(post_content, "html.parser")
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allowed_iframe_sources = ["youtube.com", "vimeo.com", "tv.lumbung.space"]
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for img in soup(["img", "object"]):
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local_image = grab_media(post_dir, img["src"])
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if img["src"] != local_image:
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img["src"] = local_image
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for iframe in soup(["iframe"]):
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if not any(source in iframe["src"] for source in allowed_iframe_sources):
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print("filtered iframe: {}...".format(iframe["src"][:25]))
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iframe.decompose()
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return soup.decode()
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def grab_feed(feed_url):
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"""
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check whether feed has been updated
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download & return it if it has
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"""
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feed_name = urlparse(feed_url).netloc
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etag, modified = get_etag(feed_name)
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try:
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if modified:
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data = feedparser.parse(feed_url, modified=modified)
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elif etag:
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data = feedparser.parse(feed_url, etag=etag)
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else:
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data = feedparser.parse(feed_url)
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except Exception as e:
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print("Error grabbing feed")
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print(feed_name)
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print(e)
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return False
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print(data.status, feed_url)
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if data.status == 200:
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# 304 means the feed has not been modified since we last checked
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write_etag(feed_name, data)
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return data
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return False
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def main():
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feed_urls = open("feeds_list.txt", "r").read().splitlines()
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start = time.time()
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if not os.path.exists("etags"):
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os.mkdir("etags")
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output_dir = os.environ.get("OUTPUT_DIR")
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if not os.path.exists(output_dir):
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os.makedirs(output_dir)
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feed_dict = dict()
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for url in feed_urls:
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feed_name = urlparse(url).netloc
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feed_dict[url] = feed_name
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feed_names = feed_dict.values()
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content_dirs = os.listdir(output_dir)
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for i in content_dirs:
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if i not in feed_names:
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shutil.rmtree(os.path.join(output_dir, i))
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print("%s not in feeds_list.txt, removing local data" %(i))
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# add iframe to the allowlist of feedparser's sanitizer,
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# this is now handled in parse_post()
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feedparser.sanitizer._HTMLSanitizer.acceptable_elements |= {"iframe"}
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for feed_url in feed_urls:
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feed_name = feed_dict[feed_url]
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feed_dir = os.path.join(output_dir, feed_name)
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if not os.path.exists(feed_dir):
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os.makedirs(feed_dir)
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existing_posts = os.listdir(feed_dir)
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data = grab_feed(feed_url)
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if data:
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for entry in data.entries:
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# if 'tags' in entry:
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# for tag in entry.tags:
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# for x in ['lumbung.space', 'D15', 'lumbung']:
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# if x in tag['term']:
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# print(entry.title)
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entry["feed_name"] = feed_name
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post_name = slugify(entry.title)
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# pixelfed returns the whole post text as the post name. max
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# filename length is 255 on many systems. here we're shortening
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# the name and adding a hash to it to avoid a conflict in a
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# situation where 2 posts start with exactly the same text.
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if len(post_name) > 150:
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post_hash = md5(bytes(post_name, "utf-8"))
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post_name = post_name[:150] + "-" + post_hash.hexdigest()
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post_dir = os.path.join(output_dir, feed_name, post_name)
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if post_name not in existing_posts:
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# if there is a blog entry we dont already have, make it
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create_post(post_dir, entry)
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elif post_name in existing_posts:
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# if we already have it, update it
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create_post(post_dir, entry)
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existing_posts.remove(
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post_name
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) # create list of posts which have not been returned by the feed
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for post in existing_posts:
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# remove blog posts no longer returned by the RSS feed
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print("deleted", post)
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shutil.rmtree(os.path.join(feed_dir, slugify(post)))
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end = time.time()
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print(end - start)
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