# SPDX-License-Identifier: AGPL-3.0-or-later
"""`Anna's Archive`_ is a free non-profit online shadow library metasearch
engine providing access to a variety of book resources (also via IPFS), created
by a team of anonymous archivists (AnnaArchivist_).
.. _Anna's Archive: https://annas-archive.org/
.. _AnnaArchivist: https://annas-software.org/AnnaArchivist/annas-archive
Configuration
=============
The engine has the following additional settings:
- :py:obj:`aa_content`
- :py:obj:`aa_ext`
- :py:obj:`aa_sort`
With this options a SearXNG maintainer is able to configure **additional**
engines for specific searches in Anna's Archive. For example a engine to search
for *newest* articles and journals (PDF) / by shortcut ``!aaa <search-term>``.
.. code:: yaml
- name: annas articles
engine: annas_archive
shortcut: aaa
aa_content: 'magazine'
aa_ext: 'pdf'
aa_sort: 'newest'
Implementations
===============
"""
from typing import List, Dict, Any, Optional
from urllib.parse import urlencode
from lxml import html
from searx.utils import extract_text, eval_xpath, eval_xpath_getindex, eval_xpath_list
from searx.enginelib.traits import EngineTraits
from searx.data import ENGINE_TRAITS
# about
about: Dict[str, Any] = {
"website": "https://annas-archive.org/",
"wikidata_id": "Q115288326",
"official_api_documentation": None,
"use_official_api": False,
"require_api_key": False,
"results": "HTML",
}
# engine dependent config
categories: List[str] = ["files"]
paging: bool = True
# search-url
base_url: str = "https://annas-archive.org"
aa_content: str = ""
"""Anan's search form field **Content** / possible values::
book_fiction, book_unknown, book_nonfiction,
book_comic, magazine, standards_document
To not filter use an empty string (default).
"""
aa_sort: str = ''
"""Sort Anna's results, possible values::
newest, oldest, largest, smallest
To sort by *most relevant* use an empty string (default)."""
aa_ext: str = ''
"""Filter Anna's results by a file ending. Common filters for example are
``pdf`` and ``epub``.
.. note::
Anna's Archive is a beta release: Filter results by file extension does not
really work on Anna's Archive.
"""
def init(engine_settings=None): # pylint: disable=unused-argument
"""Check of engine's settings."""
traits = EngineTraits(**ENGINE_TRAITS['annas archive'])
if aa_content and aa_content not in traits.custom['content']:
raise ValueError(f'invalid setting content: {aa_content}')
if aa_sort and aa_sort not in traits.custom['sort']:
raise ValueError(f'invalid setting sort: {aa_sort}')
if aa_ext and aa_ext not in traits.custom['ext']:
raise ValueError(f'invalid setting ext: {aa_ext}')
def request(query, params: Dict[str, Any]) -> Dict[str, Any]:
lang = traits.get_language(params["language"], traits.all_locale) # type: ignore
args = {
'lang': lang,
'content': aa_content,
'ext': aa_ext,
'sort': aa_sort,
'q': query,
'page': params['pageno'],
}
# filter out None and empty values
filtered_args = dict((k, v) for k, v in args.items() if v)
params["url"] = f"{base_url}/search?{urlencode(filtered_args)}"
return params
def response(resp) -> List[Dict[str, Optional[str]]]:
results: List[Dict[str, Optional[str]]] = []
dom = html.fromstring(resp.text)
for item in eval_xpath_list(dom, '//main//div[contains(@class, "h-[125]")]/a'):
results.append(_get_result(item))
# The rendering of the WEB page is very strange; except the first position
# all other positions of Anna's result page are enclosed in SGML comments.
# These comments are *uncommented* by some JS code, see query of class
# '.js-scroll-hidden' in Anna's HTML template:
# https://annas-software.org/AnnaArchivist/annas-archive/-/blob/main/allthethings/templates/macros/md5_list.html
for item in eval_xpath_list(dom, '//main//div[contains(@class, "js-scroll-hidden")]'):
item = html.fromstring(item.xpath('./comment()')[0].text)
results.append(_get_result(item))
return results
def _get_result(item):
return {
'template': 'paper.html',
'url': base_url + extract_text(eval_xpath_getindex(item, './@href', 0)),
'title': extract_text(eval_xpath(item, './/h3/text()[1]')),
'publisher': extract_text(eval_xpath(item, './/div[contains(@class, "text-sm")]')),
'authors': [extract_text(eval_xpath(item, './/div[contains(@class, "italic")]'))],
'content': extract_text(eval_xpath(item, './/div[contains(@class, "text-xs")]')),
'thumbnail': extract_text(eval_xpath_getindex(item, './/img/@src', 0, default=None), allow_none=True),
}
def fetch_traits(engine_traits: EngineTraits):
"""Fetch languages and other search arguments from Anna's search form."""
# pylint: disable=import-outside-toplevel
import babel
from searx.network import get # see https://github.com/searxng/searxng/issues/762
from searx.locales import language_tag
engine_traits.all_locale = ''
engine_traits.custom['content'] = []
engine_traits.custom['ext'] = []
engine_traits.custom['sort'] = []
resp = get(base_url + '/search')
if not resp.ok: # type: ignore
raise RuntimeError("Response from Anna's search page is not OK.")
dom = html.fromstring(resp.text) # type: ignore
# supported language codes
lang_map = {}
for x in eval_xpath_list(dom, "//form//input[@name='lang']"):
eng_lang = x.get("value")
if eng_lang in ('', '_empty', 'nl-BE', 'und') or eng_lang.startswith('anti__'):
continue
try:
locale = babel.Locale.parse(lang_map.get(eng_lang, eng_lang), sep='-')
except babel.UnknownLocaleError:
# silently ignore unknown languages
# print("ERROR: %s -> %s is unknown by babel" % (x.get("data-name"), eng_lang))
continue
sxng_lang = language_tag(locale)
conflict = engine_traits.languages.get(sxng_lang)
if conflict:
if conflict != eng_lang:
print("CONFLICT: babel %s --> %s, %s" % (sxng_lang, conflict, eng_lang))
continue
engine_traits.languages[sxng_lang] = eng_lang
for x in eval_xpath_list(dom, "//form//input[@name='content']"):
if not x.get("value").startswith("anti__"):
engine_traits.custom['content'].append(x.get("value"))
for x in eval_xpath_list(dom, "//form//input[@name='ext']"):
if not x.get("value").startswith("anti__"):
engine_traits.custom['ext'].append(x.get("value"))
for x in eval_xpath_list(dom, "//form//select[@name='sort']//option"):
engine_traits.custom['sort'].append(x.get("value"))
# for better diff; sort the persistence of these traits
engine_traits.custom['content'].sort()
engine_traits.custom['ext'].sort()
engine_traits.custom['sort'].sort()