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"""Simple API that abstracts away the differences between feed types."""
from datetime import datetime, timedelta
import html
import os
from typing import Optional, List, Tuple
import urllib.parse
import attr
from . import atom, rss, json_feed
from .exceptions import (
FeedParseError, FeedDocumentError, FeedXMLError, FeedJSONError
)
@attr.s
class Attachment:
link: str = attr.ib()
mime_type: Optional[str] = attr.ib()
title: Optional[str] = attr.ib()
size_in_bytes: Optional[int] = attr.ib()
duration: Optional[timedelta] = attr.ib()
@attr.s
class Article:
id: str = attr.ib()
title: Optional[str] = attr.ib()
link: Optional[str] = attr.ib()
content: str = attr.ib()
published_at: Optional[datetime] = attr.ib()
updated_at: Optional[datetime] = attr.ib()
attachments: List[Attachment] = attr.ib()
@attr.s
class Feed:
title: str = attr.ib()
subtitle: Optional[str] = attr.ib()
link: Optional[str] = attr.ib()
updated_at: Optional[datetime] = attr.ib()
articles: List[Article] = attr.ib()
def _adapt_atom_feed(atom_feed: atom.AtomFeed) -> Feed:
articles = list()
for entry in atom_feed.entries:
if entry.content is not None:
content = entry.content.value
elif entry.summary is not None:
content = entry.summary.value
else:
content = ''
published_at, updated_at = _get_article_dates(entry.published,
entry.updated)
# Find article link and attachments
article_link = None
attachments = list()
for candidate_link in entry.links:
if candidate_link.rel in ('alternate', None):
article_link = candidate_link.href
elif candidate_link.rel == 'enclosure':
attachments.append(Attachment(
title=_get_attachment_title(candidate_link.title,
candidate_link.href),
link=candidate_link.href,
mime_type=candidate_link.type_,
size_in_bytes=candidate_link.length,
duration=None
))
if entry.title is None:
entry_title = None
elif entry.title.text_type in (atom.AtomTextType.html,
atom.AtomTextType.xhtml):
entry_title = html.unescape(entry.title.value).strip()
else:
entry_title = entry.title.value
articles.append(Article(
entry.id_,
entry_title,
article_link,
content,
published_at,
updated_at,
attachments
))
# Find feed link
link = None
for candidate_link in atom_feed.links:
if candidate_link.rel == 'self':
link = candidate_link.href
break
return Feed(
atom_feed.title.value if atom_feed.title else atom_feed.id_,
atom_feed.subtitle.value if atom_feed.subtitle else None,
link,
atom_feed.updated,
articles
)
def _adapt_rss_channel(rss_channel: rss.RSSChannel) -> Feed:
articles = list()
for item in rss_channel.items:
attachments = [
Attachment(link=e.url, mime_type=e.type, size_in_bytes=e.length,
title=_get_attachment_title(None, e.url), duration=None)
for e in item.enclosures
]
articles.append(Article(
item.guid or item.link,
item.title,
item.link,
item.content_encoded or item.description or '',
item.pub_date,
None,
attachments
))
if rss_channel.title is None and rss_channel.link is None:
raise FeedParseError('RSS feed does not have a title nor a link')
return Feed(
rss_channel.title if rss_channel.title else rss_channel.link,
rss_channel.description,
rss_channel.link,
rss_channel.pub_date,
articles
)
def _adapt_json_feed(json_feed: json_feed.JSONFeed) -> Feed:
articles = list()
for item in json_feed.items:
attachments = [
Attachment(a.url, a.mime_type,
_get_attachment_title(a.title, a.url),
a.size_in_bytes, a.duration)
for a in item.attachments
]
articles.append(Article(
item.id_,
item.title,
item.url,
item.content_html or item.content_text or '',
item.date_published,
item.date_modified,
attachments
))
return Feed(
json_feed.title,
json_feed.description,
json_feed.feed_url,
None,
articles
)
def _get_article_dates(published_at: Optional[datetime],
updated_at: Optional[datetime]
) -> Tuple[Optional[datetime], Optional[datetime]]:
if published_at and updated_at:
return published_at, updated_at
if updated_at:
return updated_at, None
if published_at:
return published_at, None
raise FeedParseError('Article does not have proper dates')
def _get_attachment_title(attachment_title: Optional[str], link: str) -> str:
if attachment_title:
return attachment_title
parsed_link = urllib.parse.urlparse(link)
return os.path.basename(parsed_link.path)
def _simple_parse(pairs, content) -> Feed:
is_xml = True
is_json = True
for parser, adapter in pairs:
try:
return adapter(parser(content))
except FeedXMLError:
is_xml = False
except FeedJSONError:
is_json = False
except FeedParseError:
continue
if not is_xml and not is_json:
raise FeedDocumentError('File is not a supported feed type')
raise FeedParseError('File is not a valid supported feed')
def simple_parse_file(filename: str) -> Feed:
"""Parse an Atom, RSS or JSON feed from a local file."""
pairs = (
(rss.parse_rss_file, _adapt_rss_channel),
(atom.parse_atom_file, _adapt_atom_feed),
(json_feed.parse_json_feed_file, _adapt_json_feed)
)
return _simple_parse(pairs, filename)
def simple_parse_bytes(data: bytes) -> Feed:
"""Parse an Atom, RSS or JSON feed from a byte-string containing data."""
pairs = (
(rss.parse_rss_bytes, _adapt_rss_channel),
(atom.parse_atom_bytes, _adapt_atom_feed),
(json_feed.parse_json_feed_bytes, _adapt_json_feed)
)
return _simple_parse(pairs, data)
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