text: # 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])
  