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from datetime import datetime, timedelta
import json
from typing import Optional, List
import attr
from .exceptions import FeedParseError, FeedJSONError
from .utils import try_parse_date
@attr.s
class JSONFeedAuthor:
name: Optional[str] = attr.ib()
url: Optional[str] = attr.ib()
avatar: Optional[str] = attr.ib()
@attr.s
class JSONFeedAttachment:
url: str = attr.ib()
mime_type: str = attr.ib()
title: Optional[str] = attr.ib()
size_in_bytes: Optional[int] = attr.ib()
duration: Optional[timedelta] = attr.ib()
@attr.s
class JSONFeedItem:
id_: str = attr.ib()
url: Optional[str] = attr.ib()
external_url: Optional[str] = attr.ib()
title: Optional[str] = attr.ib()
content_html: Optional[str] = attr.ib()
content_text: Optional[str] = attr.ib()
summary: Optional[str] = attr.ib()
image: Optional[str] = attr.ib()
banner_image: Optional[str] = attr.ib()
date_published: Optional[datetime] = attr.ib()
date_modified: Optional[datetime] = attr.ib()
author: Optional[JSONFeedAuthor] = attr.ib()
tags: List[str] = attr.ib()
attachments: List[JSONFeedAttachment] = attr.ib()
@attr.s
class JSONFeed:
version: str = attr.ib()
title: str = attr.ib()
home_page_url: Optional[str] = attr.ib()
feed_url: Optional[str] = attr.ib()
description: Optional[str] = attr.ib()
user_comment: Optional[str] = attr.ib()
next_url: Optional[str] = attr.ib()
icon: Optional[str] = attr.ib()
favicon: Optional[str] = attr.ib()
author: Optional[JSONFeedAuthor] = attr.ib()
expired: bool = attr.ib()
items: List[JSONFeedItem] = attr.ib()
def _get_items(root: dict) -> List[JSONFeedItem]:
rv = []
items = root.get('items', [])
if not items:
return rv
for item in items:
rv.append(_get_item(item))
return rv
def _get_item(item_dict: dict) -> JSONFeedItem:
return JSONFeedItem(
id_=_get_text(item_dict, 'id', optional=False),
url=_get_text(item_dict, 'url'),
external_url=_get_text(item_dict, 'external_url'),
title=_get_text(item_dict, 'title'),
content_html=_get_text(item_dict, 'content_html'),
content_text=_get_text(item_dict, 'content_text'),
summary=_get_text(item_dict, 'summary'),
image=_get_text(item_dict, 'image'),
banner_image=_get_text(item_dict, 'banner_image'),
date_published=_get_datetime(item_dict, 'date_published'),
date_modified=_get_datetime(item_dict, 'date_modified'),
author=_get_author(item_dict),
tags=_get_tags(item_dict, 'tags'),
attachments=_get_attachments(item_dict, 'attachments')
)
def _get_attachments(root, name) -> List[JSONFeedAttachment]:
rv = list()
for attachment_dict in root.get(name, []):
rv.append(JSONFeedAttachment(
_get_text(attachment_dict, 'url', optional=False),
_get_text(attachment_dict, 'mime_type', optional=False),
_get_text(attachment_dict, 'title'),
_get_int(attachment_dict, 'size_in_bytes'),
_get_duration(attachment_dict, 'duration_in_seconds')
))
return rv
def _get_tags(root, name) -> List[str]:
tags = root.get(name, [])
return [tag for tag in tags if isinstance(tag, str)]
def _get_datetime(root: dict, name, optional: bool=True) -> Optional[datetime]:
text = _get_text(root, name, optional)
if text is None:
return None
return try_parse_date(text)
def _get_expired(root: dict) -> bool:
if root.get('expired') is True:
return True
return False
def _get_author(root: dict) -> Optional[JSONFeedAuthor]:
author_dict = root.get('author')
if not author_dict:
return None
rv = JSONFeedAuthor(
name=_get_text(author_dict, 'name'),
url=_get_text(author_dict, 'url'),
avatar=_get_text(author_dict, 'avatar'),
)
if rv.name is None and rv.url is None and rv.avatar is None:
return None
return rv
def _get_int(root: dict, name: str, optional: bool=True) -> Optional[int]:
rv = root.get(name)
if not optional and rv is None:
raise FeedParseError('Could not parse feed: "{}" int is required but '
'is empty'.format(name))
if optional and rv is None:
return None
if not isinstance(rv, int):
raise FeedParseError('Could not parse feed: "{}" is not an int'
.format(name))
return rv
def _get_duration(root: dict, name: str,
optional: bool=True) -> Optional[timedelta]:
duration = _get_int(root, name, optional)
if duration is None:
return None
return timedelta(seconds=duration)
def _get_text(root: dict, name: str, optional: bool=True) -> Optional[str]:
rv = root.get(name)
if not optional and rv is None:
raise FeedParseError('Could not parse feed: "{}" text is required but '
'is empty'.format(name))
if optional and rv is None:
return None
if not isinstance(rv, str):
raise FeedParseError('Could not parse feed: "{}" is not a string'
.format(name))
return rv
def parse_json_feed(root: dict) -> JSONFeed:
return JSONFeed(
version=_get_text(root, 'version', optional=False),
title=_get_text(root, 'title', optional=False),
home_page_url=_get_text(root, 'home_page_url'),
feed_url=_get_text(root, 'feed_url'),
description=_get_text(root, 'description'),
user_comment=_get_text(root, 'user_comment'),
next_url=_get_text(root, 'next_url'),
icon=_get_text(root, 'icon'),
favicon=_get_text(root, 'favicon'),
author=_get_author(root),
expired=_get_expired(root),
items=_get_items(root)
)
def parse_json_feed_file(filename: str) -> JSONFeed:
"""Parse a JSON feed from a local json file."""
with open(filename) as f:
try:
root = json.load(f)
except json.decoder.JSONDecodeError:
raise FeedJSONError('Not a valid JSON document')
return parse_json_feed(root)
def parse_json_feed_bytes(data: bytes) -> JSONFeed:
"""Parse a JSON feed from a byte-string containing JSON data."""
try:
root = json.loads(data)
except json.decoder.JSONDecodeError:
raise FeedJSONError('Not a valid JSON document')
return parse_json_feed(root)
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