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webinterface.py
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webinterface.py
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# -*- coding: utf-8 -*-
#
# This file is part of Invenio.
# Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2014 CERN.
#
# Invenio is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version.
#
# Invenio is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Invenio; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""DocExtract REST and Web API
Exposes document extration facilities to the world
"""
import pkg_resources
from tempfile import NamedTemporaryFile
from invenio.ext.legacy.handler import WebInterfaceDirectory
from invenio.legacy.webuser import collect_user_info
from invenio.legacy.webpage import page
from invenio.config import CFG_TMPSHAREDDIR, CFG_ETCDIR
from invenio.legacy.refextract.api import extract_references_from_file_xml, \
extract_references_from_url_xml, \
extract_references_from_string_xml
from invenio.modules.formatter.engine import format_record
import invenio.legacy.template
docextract_templates = invenio.legacy.template.load('docextract')
def check_login(req):
"""Check that the user is logged in"""
user_info = collect_user_info(req)
if user_info['email'] == 'guest':
# 1. User is guest: must login prior to upload
# return 'Please login before uploading file.'
pass
def check_url(url):
"""Check that the url we received is not gibberish"""
return url.startswith('http://') or \
url.startswith('https://') or \
url.startswith('ftp://')
def extract_from_pdf_string(pdf):
"""Extract references from a pdf stored in a string
Given a string representing a pdf, this function writes the string to
disk and passes it to refextract.
We need to create a temoporary file because we need to run pdf2text on it"""
# Save new record to file
tf = NamedTemporaryFile(prefix='docextract-pdf',
dir=CFG_TMPSHAREDDIR)
try:
tf.write(pdf)
tf.flush()
refs = extract_references_from_file_xml(tf.name)
finally:
# Also deletes the file
tf.close()
return refs
def make_arxiv_url(arxiv_id):
"""Make a url we can use to download a pdf from arxiv
Arguments:
arxiv_id -- the arxiv id of the record to link to
"""
return "http://arxiv.org/pdf/%s.pdf" % arxiv_id
class WebInterfaceAPIDocExtract(WebInterfaceDirectory):
"""DocExtract REST API"""
_exports = [
('extract-references-pdf', 'extract_references_pdf'),
('extract-references-pdf-url', 'extract_references_pdf_url'),
('extract-references-txt', 'extract_references_txt'),
]
def extract_references_pdf(self, req, form):
"""Extract references from uploaded pdf"""
check_login(req)
if 'pdf' not in form:
return 'No PDF file uploaded'
return extract_from_pdf_string(form['pdf'].stream.read())
def extract_references_pdf_url(self, req, form):
"""Extract references from the pdf pointed by the passed url"""
check_login(req)
if 'url' not in form:
return 'No URL specified'
url = form['url']
if not check_url(url):
return 'Invalid URL specified'
return extract_references_from_url_xml(url)
def extract_references_txt(self, req, form):
"""Extract references from plain text"""
check_login(req)
if 'txt' not in form:
return 'No text specified'
txt = form['txt'].stream.read()
return extract_references_from_string_xml(txt, is_only_references=False)
class WebInterfaceDocExtract(WebInterfaceDirectory):
"""DocExtract API"""
_exports = ['api',
('', 'extract'),
('example.pdf', 'example_pdf'),
]
api = WebInterfaceAPIDocExtract()
def example_pdf(self, req, _form):
"""Serve a test pdf for tests"""
f = open(pkg_resources.resource_filename(
'invenio.modules.textminer.testsuite',
'data/example.pdf'), 'rb')
try:
req.write(f.read())
finally:
f.close()
def extract(self, req, form):
"""Refrences extraction page
This page can be used for authors to test their pdfs against our
refrences extraction process"""
user_info = collect_user_info(req)
# Handle the 3 POST parameters
if 'pdf' in form and form['pdf']:
pdf = form['pdf']
references_xml = extract_from_pdf_string(pdf)
elif 'arxiv' in form and form['arxiv']:
url = make_arxiv_url(arxiv_id=form['arxiv'])
references_xml = extract_references_from_url_xml(url)
elif 'url' in form and form['url']:
url = form['url']
references_xml = extract_references_from_url_xml(url)
elif 'txt' in form and form['txt'].value:
txt = form['txt'].value.decode('utf-8', 'ignore')
references_xml = extract_references_from_string_xml(txt)
else:
references_xml = None
# If we have not uploaded anything yet
# Display the form that allows us to do so
if not references_xml:
out = docextract_templates.tmpl_web_form()
else:
references_html = format_record(0,
'hdref',
xml_record=references_xml,
user_info=user_info)
out = docextract_templates.tmpl_web_result(references_html)
# Render the page (including header, footer)
return page(title='References Extractor',
body=out,
uid=user_info['uid'],
req=req)

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