eulfedora/indexdata/util.py
# file eulfedora/indexdata/util.py
#
# Copyright 2010,2011 Emory University Libraries
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from PyPDF2 import PdfFileReader
def pdf_to_text(pdfstream):
'''Extract the text from a PDF document, e.g. to add PDF text
content to an index for searching.
To use on a file, the syntax is:
text = pdf_to_text(open(pdf_filepath, 'rb'))
To use on a datastream from EULFedora, the syntax is:
pdfobj = repository.get_object(pid)
text = pdf_to_text(pdfobj.pdf.content)
:param pdfstream: A file-like object that supports read and seek
methods, as required by :class:`pyPdf.PdfFileReader`
'''
pdfreader = PdfFileReader(pdfstream)
if pdfreader.isEncrypted:
raise Exception('Cannot extract text from encrypted PDF documents')
return '\n'.join([page.extractText() for page in pdfreader.pages])