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websubmit_file_converter.py
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Thu, Nov 21, 12:21

websubmit_file_converter.py
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# -*- coding: utf-8 -*-
## This file is part of Invenio.
## Copyright (C) 2009, 2010, 2011, 2012 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.
"""
This module implement fulltext conversion between many different file formats.
"""
import os
import stat
import re
import sys
import shutil
import tempfile
import HTMLParser
import time
import subprocess
import atexit
import signal
import threading
from logging import DEBUG, getLogger
from htmlentitydefs import entitydefs
from optparse import OptionParser
try:
from invenio.hocrlib import create_pdf, extract_hocr, CFG_PPM_RESOLUTION
from pyPdf import PdfFileReader, PdfFileWriter
CFG_CAN_DO_OCR = True
except ImportError:
CFG_CAN_DO_OCR = False
from invenio.textutils import wrap_text_in_a_box
from invenio.shellutils import run_process_with_timeout, run_shell_command
from invenio.config import CFG_TMPDIR, CFG_ETCDIR, CFG_PYLIBDIR, \
CFG_PATH_ANY2DJVU, \
CFG_PATH_PDFINFO, \
CFG_PATH_GS, \
CFG_PATH_PDFOPT, \
CFG_PATH_PDFTOPS, \
CFG_PATH_GZIP, \
CFG_PATH_GUNZIP, \
CFG_PATH_PDFTOTEXT, \
CFG_PATH_PDFTOPPM, \
CFG_PATH_OCROSCRIPT, \
CFG_PATH_DJVUPS, \
CFG_PATH_DJVUTXT, \
CFG_PATH_OPENOFFICE_PYTHON, \
CFG_PATH_PSTOTEXT, \
CFG_PATH_TIFF2PDF, \
CFG_PATH_PS2PDF, \
CFG_OPENOFFICE_SERVER_HOST, \
CFG_OPENOFFICE_SERVER_PORT, \
CFG_OPENOFFICE_USER, \
CFG_PATH_CONVERT, \
CFG_PATH_PAMFILE, \
CFG_BINDIR, \
CFG_LOGDIR, \
CFG_BIBSCHED_PROCESS_USER, \
CFG_BIBDOCFILE_BEST_FORMATS_TO_EXTRACT_TEXT_FROM, \
CFG_BIBDOCFILE_DESIRED_CONVERSIONS
from invenio.errorlib import register_exception
def get_file_converter_logger():
return getLogger("InvenioWebSubmitFileConverterLogger")
CFG_TWO2THREE_LANG_CODES = {
'en': 'eng',
'nl': 'nld',
'es': 'spa',
'de': 'deu',
'it': 'ita',
'fr': 'fra',
}
CFG_OPENOFFICE_TMPDIR = os.path.join(CFG_TMPDIR, 'ooffice-tmp-files')
CFG_GS_MINIMAL_VERSION_FOR_PDFA = "8.65"
CFG_GS_MINIMAL_VERSION_FOR_PDFX = "8.52"
CFG_ICC_PATH = os.path.join(CFG_ETCDIR, 'websubmit', 'file_converter_templates', 'ISOCoatedsb.icc')
CFG_PDFA_DEF_PATH = os.path.join(CFG_ETCDIR, 'websubmit', 'file_converter_templates', 'PDFA_def.ps')
CFG_PDFX_DEF_PATH = os.path.join(CFG_ETCDIR, 'websubmit', 'file_converter_templates', 'PDFX_def.ps')
CFG_UNOCONV_LOG_PATH = os.path.join(CFG_LOGDIR, 'unoconv.log')
_RE_CLEAN_SPACES = re.compile(r'\s+')
class InvenioWebSubmitFileConverterError(Exception):
pass
def get_conversion_map():
"""Return a dictionary of the form:
'.pdf' : {'.ps.gz' : ('pdf2ps', {param1 : value1...})
"""
ret = {
'.csv': {},
'.djvu': {},
'.doc': {},
'.docx': {},
'.sxw': {},
'.htm': {},
'.html': {},
'.odp': {},
'.ods': {},
'.odt': {},
'.pdf': {},
'.ppt': {},
'.pptx': {},
'.sxi': {},
'.ps': {},
'.ps.gz': {},
'.rtf': {},
'.tif': {},
'.tiff': {},
'.txt': {},
'.xls': {},
'.xlsx': {},
'.sxc': {},
'.xml': {},
'.hocr': {},
'.pdf;pdfa': {},
'.asc': {},
}
if CFG_PATH_GZIP:
ret['.ps']['.ps.gz'] = (gzip, {})
if CFG_PATH_GUNZIP:
ret['.ps.gz']['.ps'] = (gunzip, {})
if CFG_PATH_ANY2DJVU:
ret['.pdf']['.djvu'] = (any2djvu, {})
ret['.ps']['.djvu'] = (any2djvu, {})
if CFG_PATH_DJVUPS:
ret['.djvu']['.ps'] = (djvu2ps, {'compress': False})
if CFG_PATH_GZIP:
ret['.djvu']['.ps.gz'] = (djvu2ps, {'compress': True})
if CFG_PATH_DJVUTXT:
ret['.djvu']['.txt'] = (djvu2text, {})
if CFG_PATH_PSTOTEXT:
ret['.ps']['.txt'] = (pstotext, {})
if CFG_PATH_GUNZIP:
ret['.ps.gz']['.txt'] = (pstotext, {})
if can_pdfa():
ret['.ps']['.pdf;pdfa'] = (ps2pdfa, {})
ret['.pdf']['.pdf;pdfa'] = (pdf2pdfa, {})
if CFG_PATH_GUNZIP:
ret['.ps.gz']['.pdf;pdfa'] = (ps2pdfa, {})
else:
if CFG_PATH_PS2PDF:
ret['.ps']['.pdf;pdfa'] = (ps2pdf, {})
if CFG_PATH_GUNZIP:
ret['.ps.gz']['.pdf'] = (ps2pdf, {})
if can_pdfx():
ret['.ps']['.pdf;pdfx'] = (ps2pdfx, {})
ret['.pdf']['.pdf;pdfx'] = (pdf2pdfx, {})
if CFG_PATH_GUNZIP:
ret['.ps.gz']['.pdf;pdfx'] = (ps2pdfx, {})
if CFG_PATH_PDFTOPS:
ret['.pdf']['.ps'] = (pdf2ps, {'compress': False})
ret['.pdf;pdfa']['.ps'] = (pdf2ps, {'compress': False})
if CFG_PATH_GZIP:
ret['.pdf']['.ps.gz'] = (pdf2ps, {'compress': True})
ret['.pdf;pdfa']['.ps.gz'] = (pdf2ps, {'compress': True})
if CFG_PATH_PDFTOTEXT:
ret['.pdf']['.txt'] = (pdf2text, {})
ret['.pdf;pdfa']['.txt'] = (pdf2text, {})
ret['.asc']['.txt'] = (txt2text, {})
ret['.txt']['.txt'] = (txt2text, {})
ret['.csv']['.txt'] = (txt2text, {})
ret['.html']['.txt'] = (html2text, {})
ret['.htm']['.txt'] = (html2text, {})
ret['.xml']['.txt'] = (html2text, {})
if CFG_PATH_TIFF2PDF:
ret['.tiff']['.pdf'] = (tiff2pdf, {})
ret['.tif']['.pdf'] = (tiff2pdf, {})
if CFG_PATH_OPENOFFICE_PYTHON and CFG_OPENOFFICE_SERVER_HOST:
ret['.rtf']['.odt'] = (unoconv, {'output_format': 'odt'})
ret['.rtf']['.pdf;pdfa'] = (unoconv, {'output_format': 'pdf'})
ret['.rtf']['.txt'] = (unoconv, {'output_format': 'txt'})
ret['.rtf']['.docx'] = (unoconv, {'output_format': 'docx'})
ret['.doc']['.odt'] = (unoconv, {'output_format': 'odt'})
ret['.doc']['.pdf;pdfa'] = (unoconv, {'output_format': 'pdf'})
ret['.doc']['.txt'] = (unoconv, {'output_format': 'txt'})
ret['.doc']['.docx'] = (unoconv, {'output_format': 'docx'})
ret['.docx']['.odt'] = (unoconv, {'output_format': 'odt'})
ret['.docx']['.pdf;pdfa'] = (unoconv, {'output_format': 'pdf'})
ret['.docx']['.txt'] = (unoconv, {'output_format': 'txt'})
ret['.sxw']['.odt'] = (unoconv, {'output_format': 'odt'})
ret['.sxw']['.pdf;pdfa'] = (unoconv, {'output_format': 'pdf'})
ret['.sxw']['.txt'] = (unoconv, {'output_format': 'txt'})
ret['.docx']['.docx'] = (unoconv, {'output_format': 'docx'})
ret['.odt']['.doc'] = (unoconv, {'output_format': 'doc'})
ret['.odt']['.pdf;pdfa'] = (unoconv, {'output_format': 'pdf'})
ret['.odt']['.txt'] = (unoconv, {'output_format': 'txt'})
ret['.odt']['.docx'] = (unoconv, {'output_format': 'docx'})
ret['.ppt']['.odp'] = (unoconv, {'output_format': 'odp'})
ret['.ppt']['.pdf;pdfa'] = (unoconv, {'output_format': 'pdf'})
ret['.ppt']['.txt'] = (unoconv, {'output_format': 'txt'})
ret['.ppt']['.pptx'] = (unoconv, {'output_format': 'pptx'})
ret['.pptx']['.odp'] = (unoconv, {'output_format': 'odp'})
ret['.pptx']['.pdf;pdfa'] = (unoconv, {'output_format': 'pdf'})
ret['.pptx']['.txt'] = (unoconv, {'output_format': 'txt'})
ret['.sxi']['.odp'] = (unoconv, {'output_format': 'odp'})
ret['.sxi']['.pdf;pdfa'] = (unoconv, {'output_format': 'pdf'})
ret['.sxi']['.txt'] = (unoconv, {'output_format': 'txt'})
ret['.sxi']['.pptx'] = (unoconv, {'output_format': 'pptx'})
ret['.odp']['.ppt'] = (unoconv, {'output_format': 'ppt'})
ret['.odp']['.pptx'] = (unoconv, {'output_format': 'pptx'})
ret['.odp']['.pdf;pdfa'] = (unoconv, {'output_format': 'pdf'})
ret['.odp']['.txt'] = (unoconv, {'output_format': 'txt'})
ret['.odp']['.pptx'] = (unoconv, {'output_format': 'pptx'})
ret['.xls']['.ods'] = (unoconv, {'output_format': 'ods'})
ret['.xls']['.xlsx'] = (unoconv, {'output_format': 'xslx'})
ret['.xlsx']['.ods'] = (unoconv, {'output_format': 'ods'})
ret['.sxc']['.ods'] = (unoconv, {'output_format': 'ods'})
ret['.sxc']['.xlsx'] = (unoconv, {'output_format': 'xslx'})
ret['.ods']['.xls'] = (unoconv, {'output_format': 'xls'})
ret['.ods']['.pdf;pdfa'] = (unoconv, {'output_format': 'pdf'})
ret['.ods']['.csv'] = (unoconv, {'output_format': 'csv'})
ret['.ods']['.xlsx'] = (unoconv, {'output_format': 'xslx'})
ret['.csv']['.txt'] = (txt2text, {})
## Let's add all the existing output formats as potential input formats.
for value in ret.values():
for key in value.keys():
if key not in ret:
ret[key] = {}
return ret
def get_best_format_to_extract_text_from(filelist, best_formats=CFG_BIBDOCFILE_BEST_FORMATS_TO_EXTRACT_TEXT_FROM):
"""
Return among the filelist the best file whose format is best suited for
extracting text.
"""
from invenio.bibdocfile import decompose_file, normalize_format
best_formats = [normalize_format(aformat) for aformat in best_formats if can_convert(aformat, '.txt')]
for aformat in best_formats:
for filename in filelist:
if decompose_file(filename, skip_version=True)[2].endswith(aformat):
return filename
raise InvenioWebSubmitFileConverterError("It's not possible to extract valuable text from any of the proposed files.")
def get_missing_formats(filelist, desired_conversion=None):
"""Given a list of files it will return a dictionary of the form:
file1 : missing formats to generate from it...
"""
from invenio.bibdocfile import normalize_format, decompose_file
def normalize_desired_conversion():
ret = {}
for key, value in desired_conversion.iteritems():
ret[normalize_format(key)] = [normalize_format(aformat) for aformat in value]
return ret
if desired_conversion is None:
desired_conversion = CFG_BIBDOCFILE_DESIRED_CONVERSIONS
available_formats = [decompose_file(filename, skip_version=True)[2] for filename in filelist]
missing_formats = []
desired_conversion = normalize_desired_conversion()
ret = {}
for filename in filelist:
aformat = decompose_file(filename, skip_version=True)[2]
if aformat in desired_conversion:
for desired_format in desired_conversion[aformat]:
if desired_format not in available_formats and desired_format not in missing_formats:
missing_formats.append(desired_format)
if filename not in ret:
ret[filename] = []
ret[filename].append(desired_format)
return ret
def can_convert(input_format, output_format, max_intermediate_conversions=4):
"""Return the chain of conversion to transform input_format into output_format, if any."""
from invenio.bibdocfile import normalize_format
if max_intermediate_conversions <= 0:
return []
input_format = normalize_format(input_format)
output_format = normalize_format(output_format)
if input_format in __CONVERSION_MAP:
if output_format in __CONVERSION_MAP[input_format]:
return [__CONVERSION_MAP[input_format][output_format]]
best_res = []
best_intermediate = ''
for intermediate_format in __CONVERSION_MAP[input_format]:
res = can_convert(intermediate_format, output_format, max_intermediate_conversions-1)
if res and (len(res) < best_res or not best_res):
best_res = res
best_intermediate = intermediate_format
if best_res:
return [__CONVERSION_MAP[input_format][best_intermediate]] + best_res
return []
def can_pdfopt(verbose=False):
"""Return True if it's possible to optimize PDFs."""
if CFG_PATH_PDFOPT:
return True
elif verbose:
print >> sys.stderr, "PDF linearization is not supported because the pdfopt executable is not available"
return False
def can_pdfx(verbose=False):
"""Return True if it's possible to generate PDF/Xs."""
if not CFG_PATH_PDFTOPS:
if verbose:
print >> sys.stderr, "Conversion of PS or PDF to PDF/X is not possible because the pdftops executable is not available"
return False
if not CFG_PATH_GS:
if verbose:
print >> sys.stderr, "Conversion of PS or PDF to PDF/X is not possible because the gs executable is not available"
return False
else:
try:
output = run_shell_command("%s --version" % CFG_PATH_GS)[1].strip()
if not output:
raise ValueError("No version information returned")
if [int(number) for number in output.split('.')] < [int(number) for number in CFG_GS_MINIMAL_VERSION_FOR_PDFX.split('.')]:
print >> sys.stderr, "Conversion of PS or PDF to PDF/X is not possible because the minimal gs version for the executable %s is not met: it should be %s but %s has been found" % (CFG_PATH_GS, CFG_GS_MINIMAL_VERSION_FOR_PDFX, output)
return False
except Exception, err:
print >> sys.stderr, "Conversion of PS or PDF to PDF/X is not possible because it's not possible to retrieve the gs version using the executable %s: %s" % (CFG_PATH_GS, err)
return False
if not CFG_PATH_PDFINFO:
if verbose:
print >> sys.stderr, "Conversion of PS or PDF to PDF/X is not possible because the pdfinfo executable is not available"
return False
if not os.path.exists(CFG_ICC_PATH):
if verbose:
print >> sys.stderr, "Conversion of PS or PDF to PDF/X is not possible because %s does not exists. Have you run make install-pdfa-helper-files?" % CFG_ICC_PATH
return False
return True
def can_pdfa(verbose=False):
"""Return True if it's possible to generate PDF/As."""
if not CFG_PATH_PDFTOPS:
if verbose:
print >> sys.stderr, "Conversion of PS or PDF to PDF/A is not possible because the pdftops executable is not available"
return False
if not CFG_PATH_GS:
if verbose:
print >> sys.stderr, "Conversion of PS or PDF to PDF/A is not possible because the gs executable is not available"
return False
else:
try:
output = run_shell_command("%s --version" % CFG_PATH_GS)[1].strip()
if not output:
raise ValueError("No version information returned")
if [int(number) for number in output.split('.')] < [int(number) for number in CFG_GS_MINIMAL_VERSION_FOR_PDFA.split('.')]:
print >> sys.stderr, "Conversion of PS or PDF to PDF/A is not possible because the minimal gs version for the executable %s is not met: it should be %s but %s has been found" % (CFG_PATH_GS, CFG_GS_MINIMAL_VERSION_FOR_PDFA, output)
return False
except Exception, err:
print >> sys.stderr, "Conversion of PS or PDF to PDF/A is not possible because it's not possible to retrieve the gs version using the executable %s: %s" % (CFG_PATH_GS, err)
return False
if not CFG_PATH_PDFINFO:
if verbose:
print >> sys.stderr, "Conversion of PS or PDF to PDF/A is not possible because the pdfinfo executable is not available"
return False
if not os.path.exists(CFG_ICC_PATH):
if verbose:
print >> sys.stderr, "Conversion of PS or PDF to PDF/A is not possible because %s does not exists. Have you run make install-pdfa-helper-files?" % CFG_ICC_PATH
return False
return True
def can_perform_ocr(verbose=False):
"""Return True if it's possible to perform OCR."""
if not CFG_CAN_DO_OCR:
if verbose:
print >> sys.stderr, "OCR is not supported because either the pyPdf of ReportLab Python libraries are missing"
return False
if not CFG_PATH_OCROSCRIPT:
if verbose:
print >> sys.stderr, "OCR is not supported because the ocroscript executable is not available"
return False
if not CFG_PATH_PDFTOPPM:
if verbose:
print >> sys.stderr, "OCR is not supported because the pdftoppm executable is not available"
return False
return True
def guess_ocropus_produced_garbage(input_file, hocr_p):
"""Return True if the output produced by OCROpus in hocr format contains
only garbage instead of text. This is implemented via an heuristic:
if the most common length for sentences encoded in UTF-8 is 1 then
this is Garbage (tm).
"""
def _get_words_from_text():
ret = []
for row in open(input_file):
for word in row.strip().split(' '):
ret.append(word.strip())
return ret
def _get_words_from_hocr():
ret = []
hocr = extract_hocr(open(input_file).read())
for dummy, dummy, lines in hocr:
for dummy, line in lines:
for word in line.split():
ret.append(word.strip())
return ret
if hocr_p:
words = _get_words_from_hocr()
else:
words = _get_words_from_text()
#stats = {}
#most_common_len = 0
#most_common_how_many = 0
#for word in words:
#if word:
#word_length = len(word.decode('utf-8'))
#stats[word_length] = stats.get(word_length, 0) + 1
#if stats[word_length] > most_common_how_many:
#most_common_len = word_length
#most_common_how_many = stats[word_length]
goods = 0
bads = 0
for word in words:
for char in word.decode('utf-8'):
if (u'a' <= char <= u'z') or (u'A' <= char <= u'Z'):
goods += 1
else:
bads += 1
if bads > goods:
get_file_converter_logger().debug('OCROpus produced garbage')
return True
else:
return False
def guess_is_OCR_needed(input_file, ln='en'):
"""
Tries to see if enough text is retrievable from input_file.
Return True if OCR is needed, False if it's already
possible to retrieve information from the document.
"""
## FIXME: a way to understand if pdftotext has returned garbage
## shuould be found. E.g. 1.0*len(text)/len(zlib.compress(text)) < 2.1
## could be a good hint for garbage being found.
return True
def convert_file(input_file, output_file=None, output_format=None, **params):
"""
Convert files from one format to another.
@param input_file [string] the path to an existing file
@param output_file [string] the path to the desired ouput. (if None a
temporary file is generated)
@param output_format [string] the desired format (if None it is taken from
output_file)
@param params other paramaters to pass to the particular converter
@return [string] the final output_file
"""
from invenio.bibdocfile import decompose_file, normalize_format
if output_format is None:
if output_file is None:
raise ValueError("At least output_file or format should be specified.")
else:
output_ext = decompose_file(output_file, skip_version=True)[2]
else:
output_ext = normalize_format(output_format)
input_ext = decompose_file(input_file, skip_version=True)[2]
conversion_chain = can_convert(input_ext, output_ext)
if conversion_chain:
get_file_converter_logger().debug("Conversion chain from %s to %s: %s" % (input_ext, output_ext, conversion_chain))
current_input = input_file
for i, (converter, final_params) in enumerate(conversion_chain):
current_output = None
if i == (len(conversion_chain) - 1):
current_output = output_file
final_params = dict(final_params)
final_params.update(params)
try:
get_file_converter_logger().debug("Converting from %s to %s using %s with params %s" % (current_input, current_output, converter, final_params))
current_output = converter(current_input, current_output, **final_params)
get_file_converter_logger().debug("... current_output %s" % (current_output, ))
except InvenioWebSubmitFileConverterError, err:
raise InvenioWebSubmitFileConverterError("Error when converting from %s to %s: %s" % (input_file, output_ext, err))
except Exception, err:
register_exception(alert_admin=True)
raise InvenioWebSubmitFileConverterError("Unexpected error when converting from %s to %s (%s): %s" % (input_file, output_ext, type(err), err))
if current_input != input_file:
os.remove(current_input)
current_input = current_output
return current_output
else:
raise InvenioWebSubmitFileConverterError("It's impossible to convert from %s to %s" % (input_ext, output_ext))
try:
_UNOCONV_DAEMON
except NameError:
_UNOCONV_DAEMON = None
_UNOCONV_DAEMON_LOCK = threading.Lock()
def _register_unoconv():
global _UNOCONV_DAEMON
if CFG_OPENOFFICE_SERVER_HOST != 'localhost':
return
_UNOCONV_DAEMON_LOCK.acquire()
try:
if not _UNOCONV_DAEMON:
output_log = open(CFG_UNOCONV_LOG_PATH, 'a')
_UNOCONV_DAEMON = subprocess.Popen(['sudo', '-S', '-u', CFG_OPENOFFICE_USER, os.path.join(CFG_BINDIR, 'inveniounoconv'), '-vvv', '-s', CFG_OPENOFFICE_SERVER_HOST, '-p', str(CFG_OPENOFFICE_SERVER_PORT), '-l'], stdin=open('/dev/null', 'r'), stdout=output_log, stderr=output_log)
time.sleep(3)
finally:
_UNOCONV_DAEMON_LOCK.release()
def _unregister_unoconv():
global _UNOCONV_DAEMON
if CFG_OPENOFFICE_SERVER_HOST != 'localhost':
return
_UNOCONV_DAEMON_LOCK.acquire()
try:
if _UNOCONV_DAEMON:
output_log = open(CFG_UNOCONV_LOG_PATH, 'a')
subprocess.call(['sudo', '-S', '-u', CFG_OPENOFFICE_USER, os.path.join(CFG_BINDIR, 'inveniounoconv'), '-k', '-vvv'], stdin=open('/dev/null', 'r'), stdout=output_log, stderr=output_log)
time.sleep(1)
if _UNOCONV_DAEMON.poll():
try:
os.kill(_UNOCONV_DAEMON.pid, signal.SIGTERM)
except OSError:
pass
if _UNOCONV_DAEMON.poll():
try:
os.kill(_UNOCONV_DAEMON.pid, signal.SIGKILL)
except OSError:
pass
finally:
_UNOCONV_DAEMON_LOCK.release()
## NOTE: in case we switch back keeping LibreOffice running, uncomment
## the following line.
#atexit.register(_unregister_unoconv)
def unoconv(input_file, output_file=None, output_format='txt', pdfopt=True, **dummy):
"""Use unconv to convert among OpenOffice understood documents."""
from invenio.bibdocfile import normalize_format
## NOTE: in case we switch back keeping LibreOffice running, uncomment
## the following line.
#_register_unoconv()
input_file, output_file, dummy = prepare_io(input_file, output_file, output_format, need_working_dir=False)
if output_format == 'txt':
unoconv_format = 'text'
else:
unoconv_format = output_format
try:
try:
## We copy the input file and we make it available to OpenOffice
## with the user nobody
from invenio.bibdocfile import decompose_file
input_format = decompose_file(input_file, skip_version=True)[2]
fd, tmpinputfile = tempfile.mkstemp(dir=CFG_TMPDIR, suffix=normalize_format(input_format))
os.close(fd)
shutil.copy(input_file, tmpinputfile)
get_file_converter_logger().debug("Prepared input file %s" % tmpinputfile)
os.chmod(tmpinputfile, stat.S_IRUSR | stat.S_IWUSR | stat.S_IRGRP | stat.S_IROTH)
tmpoutputfile = tempfile.mktemp(dir=CFG_OPENOFFICE_TMPDIR, suffix=normalize_format(output_format))
get_file_converter_logger().debug("Prepared output file %s" % tmpoutputfile)
try:
execute_command(os.path.join(CFG_BINDIR, 'inveniounoconv'), '-vvv', '-s', CFG_OPENOFFICE_SERVER_HOST, '-p', str(CFG_OPENOFFICE_SERVER_PORT), '--output', tmpoutputfile, '-f', unoconv_format, tmpinputfile, sudo=CFG_OPENOFFICE_USER)
except:
register_exception(alert_admin=True)
raise
except InvenioWebSubmitFileConverterError:
## Ok maybe OpenOffice hanged. Let's better kill it and restarted!
if CFG_OPENOFFICE_SERVER_HOST != 'localhost':
## There's not that much that we can do. Let's bail out
if not os.path.exists(tmpoutputfile) or not os.path.getsize(tmpoutputfile):
raise
else:
## Sometimes OpenOffice crashes but we don't care :-)
## it still have created a nice file.
pass
else:
execute_command(os.path.join(CFG_BINDIR, 'inveniounoconv'), '-vvv', '-k', sudo=CFG_OPENOFFICE_USER)
## NOTE: in case we switch back keeping LibreOffice running, uncomment
## the following lines.
#_unregister_unoconv()
#_register_unoconv()
time.sleep(5)
try:
execute_command(os.path.join(CFG_BINDIR, 'inveniounoconv'), '-vvv', '-s', CFG_OPENOFFICE_SERVER_HOST, '-p', str(CFG_OPENOFFICE_SERVER_PORT), '--output', tmpoutputfile, '-f', unoconv_format, tmpinputfile, sudo=CFG_OPENOFFICE_USER)
except InvenioWebSubmitFileConverterError:
execute_command(os.path.join(CFG_BINDIR, 'inveniounoconv'), '-vvv', '-k', sudo=CFG_OPENOFFICE_USER)
if not os.path.exists(tmpoutputfile) or not os.path.getsize(tmpoutputfile):
raise InvenioWebSubmitFileConverterError('No output was generated by OpenOffice')
else:
## Sometimes OpenOffice crashes but we don't care :-)
## it still have created a nice file.
pass
except Exception, err:
raise InvenioWebSubmitFileConverterError(get_unoconv_installation_guideline(err))
output_format = normalize_format(output_format)
if output_format == '.pdf' and pdfopt:
pdf2pdfopt(tmpoutputfile, output_file)
else:
shutil.copy(tmpoutputfile, output_file)
execute_command(os.path.join(CFG_BINDIR, 'inveniounoconv'), '-r', tmpoutputfile, sudo=CFG_OPENOFFICE_USER)
os.remove(tmpinputfile)
return output_file
def get_unoconv_installation_guideline(err):
"""Return the Libre/OpenOffice installation guideline (embedding the
current error message).
"""
from invenio.bibtask import guess_apache_process_user
return wrap_text_in_a_box("""\
OpenOffice.org can't properly create files in the OpenOffice.org temporary
directory %(tmpdir)s, as the user %(nobody)s (as configured in
CFG_OPENOFFICE_USER invenio(-local).conf variable): %(err)s.
In your /etc/sudoers file, you should authorize the %(apache)s user to run
%(unoconv)s as %(nobody)s user as in:
%(apache)s ALL=(%(nobody)s) NOPASSWD: %(unoconv)s
You should then run the following commands:
$ sudo mkdir -p %(tmpdir)s
$ sudo chown -R %(nobody)s %(tmpdir)s
$ sudo chmod -R 755 %(tmpdir)s""" % {
'tmpdir' : CFG_OPENOFFICE_TMPDIR,
'nobody' : CFG_OPENOFFICE_USER,
'err' : err,
'apache' : CFG_BIBSCHED_PROCESS_USER or guess_apache_process_user(),
'python' : CFG_PATH_OPENOFFICE_PYTHON,
'unoconv' : os.path.join(CFG_BINDIR, 'inveniounoconv')
})
def can_unoconv(verbose=False):
"""
If OpenOffice.org integration is enabled, checks whether the system is
properly configured.
"""
if CFG_PATH_OPENOFFICE_PYTHON and CFG_OPENOFFICE_SERVER_HOST:
try:
test = os.path.join(CFG_TMPDIR, 'test.txt')
open(test, 'w').write('test')
output = unoconv(test, output_format='pdf')
output2 = convert_file(output, output_format='.txt')
if 'test' not in open(output2).read():
raise Exception("Coulnd't produce a valid PDF with Libre/OpenOffice.org")
os.remove(output2)
os.remove(output)
os.remove(test)
return True
except Exception, err:
if verbose:
print >> sys.stderr, get_unoconv_installation_guideline(err)
return False
else:
if verbose:
print >> sys.stderr, "Libre/OpenOffice.org integration not enabled"
return False
def any2djvu(input_file, output_file=None, resolution=400, ocr=True, input_format=5, **dummy):
"""
Transform input_file into a .djvu file.
@param input_file [string] the input file name
@param output_file [string] the output_file file name, None for temporary generated
@param resolution [int] the resolution of the output_file
@param input_format [int] [1-9]:
1 - DjVu Document (for verification or OCR)
2 - PS/PS.GZ/PDF Document (default)
3 - Photo/Picture/Icon
4 - Scanned Document - B&W - <200 dpi
5 - Scanned Document - B&W - 200-400 dpi
6 - Scanned Document - B&W - >400 dpi
7 - Scanned Document - Color/Mixed - <200 dpi
8 - Scanned Document - Color/Mixed - 200-400 dpi
9 - Scanned Document - Color/Mixed - >400 dpi
@return [string] output_file input_file.
raise InvenioWebSubmitFileConverterError in case of errors.
Note: due to the bottleneck of using a centralized server, it is very
slow and is not suitable for interactive usage (e.g. WebSubmit functions)
"""
from invenio.bibdocfile import decompose_file
input_file, output_file, working_dir = prepare_io(input_file, output_file, '.djvu')
ocr = ocr and "1" or "0"
## Any2djvu expect to find the file in the current directory.
execute_command(CFG_PATH_ANY2DJVU, '-a', '-c', '-r', resolution, '-o', ocr, '-f', input_format, os.path.basename(input_file), cwd=working_dir)
## Any2djvu doesn't let you choose the output_file file name.
djvu_output = os.path.join(working_dir, decompose_file(input_file)[1] + '.djvu')
shutil.move(djvu_output, output_file)
clean_working_dir(working_dir)
return output_file
_RE_FIND_TITLE = re.compile(r'^Title:\s*(.*?)\s*$')
def pdf2pdfx(input_file, output_file=None, title=None, pdfopt=False, profile="pdf/x-3:2002", **dummy):
"""
Transform any PDF into a PDF/X (see: <http://en.wikipedia.org/wiki/PDF/X>)
@param input_file [string] the input file name
@param output_file [string] the output_file file name, None for temporary generated
@param title [string] the title of the document. None for autodiscovery.
@param pdfopt [bool] whether to linearize the pdf, too.
@param profile: [string] the PDFX profile to use. Supports: 'pdf/x-1a:2001', 'pdf/x-1a:2003', 'pdf/x-3:2002'
@return [string] output_file input_file
raise InvenioWebSubmitFileConverterError in case of errors.
"""
input_file, output_file, working_dir = prepare_io(input_file, output_file, '.pdf')
if title is None:
stdout = execute_command(CFG_PATH_PDFINFO, input_file)
for line in stdout.split('\n'):
g = _RE_FIND_TITLE.match(line)
if g:
title = g.group(1)
break
if not title:
title = 'No title'
get_file_converter_logger().debug("Extracted title is %s" % title)
if os.path.exists(CFG_ICC_PATH):
shutil.copy(CFG_ICC_PATH, working_dir)
else:
raise InvenioWebSubmitFileConverterError('ERROR: ISOCoatedsb.icc file missing. Have you run "make install-pdfa-helper-files" as part of your Invenio deployment?')
pdfx_header = open(CFG_PDFX_DEF_PATH).read()
pdfx_header = pdfx_header.replace('<<<<TITLEMARKER>>>>', title)
icc_iso_profile_def = ''
if profile == 'pdf/x-1a:2001':
pdfx_version = 'PDF/X-1a:2001'
pdfx_conformance = 'PDF/X-1a:2001'
elif profile == 'pdf/x-1a:2003':
pdfx_version = 'PDF/X-1a:2003'
pdfx_conformance = 'PDF/X-1a:2003'
elif profile == 'pdf/x-3:2002':
icc_iso_profile_def = '/ICCProfile (ISOCoatedsb.icc)'
pdfx_version = 'PDF/X-3:2002'
pdfx_conformance = 'PDF/X-3:2002'
pdfx_header = pdfx_header.replace('<<<<ICCPROFILEDEF>>>>', icc_iso_profile_def)
pdfx_header = pdfx_header.replace('<<<<GTS_PDFXVersion>>>>', pdfx_version)
pdfx_header = pdfx_header.replace('<<<<GTS_PDFXConformance>>>>', pdfx_conformance)
outputpdf = os.path.join(working_dir, 'output_file.pdf')
open(os.path.join(working_dir, 'PDFX_def.ps'), 'w').write(pdfx_header)
if profile in ['pdf/x-3:2002']:
execute_command(CFG_PATH_GS, '-sProcessColorModel=DeviceCMYK', '-dPDFX', '-dBATCH', '-dNOPAUSE', '-dNOOUTERSAVE', '-dUseCIEColor', '-sDEVICE=pdfwrite', '-dAutoRotatePages=/None', '-sOutputFile=output_file.pdf', os.path.join(working_dir, 'PDFX_def.ps'), input_file, cwd=working_dir)
elif profile in ['pdf/x-1a:2001', 'pdf/x-1a:2003']:
execute_command(CFG_PATH_GS, '-sProcessColorModel=DeviceCMYK', '-dPDFX', '-dBATCH', '-dNOPAUSE', '-dNOOUTERSAVE', '-sColorConversionStrategy=CMYK', '-sDEVICE=pdfwrite', '-dAutoRotatePages=/None', '-sOutputFile=output_file.pdf', os.path.join(working_dir, 'PDFX_def.ps'), input_file, cwd=working_dir)
if pdfopt:
execute_command(CFG_PATH_PDFOPT, outputpdf, output_file)
else:
shutil.move(outputpdf, output_file)
clean_working_dir(working_dir)
return output_file
def pdf2pdfa(input_file, output_file=None, title=None, pdfopt=True, **dummy):
"""
Transform any PDF into a PDF/A (see: <http://www.pdfa.org/>)
@param input_file [string] the input file name
@param output_file [string] the output_file file name, None for temporary generated
@param title [string] the title of the document. None for autodiscovery.
@param pdfopt [bool] whether to linearize the pdf, too.
@return [string] output_file input_file
raise InvenioWebSubmitFileConverterError in case of errors.
"""
input_file, output_file, working_dir = prepare_io(input_file, output_file, '.pdf')
if title is None:
stdout = execute_command(CFG_PATH_PDFINFO, input_file)
for line in stdout.split('\n'):
g = _RE_FIND_TITLE.match(line)
if g:
title = g.group(1)
break
if not title:
title = 'No title'
get_file_converter_logger().debug("Extracted title is %s" % title)
if os.path.exists(CFG_ICC_PATH):
shutil.copy(CFG_ICC_PATH, working_dir)
else:
raise InvenioWebSubmitFileConverterError('ERROR: ISOCoatedsb.icc file missing. Have you run "make install-pdfa-helper-files" as part of your Invenio deployment?')
pdfa_header = open(CFG_PDFA_DEF_PATH).read()
pdfa_header = pdfa_header.replace('<<<<TITLEMARKER>>>>', title)
inputps = os.path.join(working_dir, 'input.ps')
outputpdf = os.path.join(working_dir, 'output_file.pdf')
open(os.path.join(working_dir, 'PDFA_def.ps'), 'w').write(pdfa_header)
execute_command(CFG_PATH_PDFTOPS, '-level3', input_file, inputps)
execute_command(CFG_PATH_GS, '-sProcessColorModel=DeviceCMYK', '-dPDFA', '-dBATCH', '-dNOPAUSE', '-dNOOUTERSAVE', '-dUseCIEColor', '-sDEVICE=pdfwrite', '-dAutoRotatePages=/None', '-sOutputFile=output_file.pdf', os.path.join(working_dir, 'PDFA_def.ps'), 'input.ps', cwd=working_dir)
if pdfopt:
execute_command(CFG_PATH_PDFOPT, outputpdf, output_file)
else:
shutil.move(outputpdf, output_file)
clean_working_dir(working_dir)
return output_file
def pdf2pdfopt(input_file, output_file=None, **dummy):
"""
Linearize the input PDF in order to improve the web-experience when
visualizing the document through the web.
@param input_file [string] the input input_file
@param output_file [string] the output_file file name, None for temporary generated
@return [string] output_file input_file
raise InvenioWebSubmitFileConverterError in case of errors.
"""
input_file, output_file, dummy = prepare_io(input_file, output_file, '.pdf', need_working_dir=False)
execute_command(CFG_PATH_PDFOPT, input_file, output_file)
return output_file
def pdf2ps(input_file, output_file=None, level=2, compress=True, **dummy):
"""
Convert from Pdf to Postscript.
"""
if compress:
suffix = '.ps.gz'
else:
suffix = '.ps'
input_file, output_file, working_dir = prepare_io(input_file, output_file, suffix)
execute_command(CFG_PATH_PDFTOPS, '-level%i' % level, input_file, os.path.join(working_dir, 'output.ps'))
if compress:
execute_command(CFG_PATH_GZIP, '-c', os.path.join(working_dir, 'output.ps'), filename_out=output_file)
else:
shutil.move(os.path.join(working_dir, 'output.ps'), output_file)
clean_working_dir(working_dir)
return output_file
def ps2pdfx(input_file, output_file=None, title=None, pdfopt=False, profile="pdf/x-3:2002", **dummy):
"""
Transform any PS into a PDF/X (see: <http://en.wikipedia.org/wiki/PDF/X>)
@param input_file [string] the input file name
@param output_file [string] the output_file file name, None for temporary generated
@param title [string] the title of the document. None for autodiscovery.
@param pdfopt [bool] whether to linearize the pdf, too.
@param profile: [string] the PDFX profile to use. Supports: 'pdf/x-1a:2001', 'pdf/x-1a:2003', 'pdf/x-3:2002'
@return [string] output_file input_file
raise InvenioWebSubmitFileConverterError in case of errors.
"""
input_file, output_file, working_dir = prepare_io(input_file, output_file, '.pdf')
if input_file.endswith('.gz'):
new_input_file = os.path.join(working_dir, 'input.ps')
execute_command(CFG_PATH_GUNZIP, '-c', input_file, filename_out=new_input_file)
input_file = new_input_file
if not title:
title = 'No title'
shutil.copy(CFG_ICC_PATH, working_dir)
pdfx_header = open(CFG_PDFX_DEF_PATH).read()
pdfx_header = pdfx_header.replace('<<<<TITLEMARKER>>>>', title)
icc_iso_profile_def = ''
if profile == 'pdf/x-1a:2001':
pdfx_version = 'PDF/X-1a:2001'
pdfx_conformance = 'PDF/X-1a:2001'
elif profile == 'pdf/x-1a:2003':
pdfx_version = 'PDF/X-1a:2003'
pdfx_conformance = 'PDF/X-1a:2003'
elif profile == 'pdf/x-3:2002':
icc_iso_profile_def = '/ICCProfile (ISOCoatedsb.icc)'
pdfx_version = 'PDF/X-3:2002'
pdfx_conformance = 'PDF/X-3:2002'
pdfx_header = pdfx_header.replace('<<<<ICCPROFILEDEF>>>>', icc_iso_profile_def)
pdfx_header = pdfx_header.replace('<<<<GTS_PDFXVersion>>>>', pdfx_version)
pdfx_header = pdfx_header.replace('<<<<TITLEMARKER>>>>', title)
outputpdf = os.path.join(working_dir, 'output_file.pdf')
open(os.path.join(working_dir, 'PDFX_def.ps'), 'w').write(pdfx_header)
if profile in ['pdf/x-3:2002']:
execute_command(CFG_PATH_GS, '-sProcessColorModel=DeviceCMYK', '-dPDFX', '-dBATCH', '-dNOPAUSE', '-dNOOUTERSAVE', '-dUseCIEColor', '-sDEVICE=pdfwrite', '-dAutoRotatePages=/None', '-sOutputFile=output_file.pdf', os.path.join(working_dir, 'PDFX_def.ps'), 'input.ps', cwd=working_dir)
elif profile in ['pdf/x-1a:2001', 'pdf/x-1a:2003']:
execute_command(CFG_PATH_GS, '-sProcessColorModel=DeviceCMYK', '-dPDFX', '-dBATCH', '-dNOPAUSE', '-dNOOUTERSAVE', '-sColorConversionStrategy=CMYK', '-dAutoRotatePages=/None', '-sDEVICE=pdfwrite', '-sOutputFile=output_file.pdf', os.path.join(working_dir, 'PDFX_def.ps'), 'input.ps', cwd=working_dir)
if pdfopt:
execute_command(CFG_PATH_PDFOPT, outputpdf, output_file)
else:
shutil.move(outputpdf, output_file)
clean_working_dir(working_dir)
return output_file
def ps2pdfa(input_file, output_file=None, title=None, pdfopt=True, **dummy):
"""
Transform any PS into a PDF/A (see: <http://www.pdfa.org/>)
@param input_file [string] the input file name
@param output_file [string] the output_file file name, None for temporary generated
@param title [string] the title of the document. None for autodiscovery.
@param pdfopt [bool] whether to linearize the pdf, too.
@return [string] output_file input_file
raise InvenioWebSubmitFileConverterError in case of errors.
"""
input_file, output_file, working_dir = prepare_io(input_file, output_file, '.pdf')
if input_file.endswith('.gz'):
new_input_file = os.path.join(working_dir, 'input.ps')
execute_command(CFG_PATH_GUNZIP, '-c', input_file, filename_out=new_input_file)
input_file = new_input_file
if not title:
title = 'No title'
shutil.copy(CFG_ICC_PATH, working_dir)
pdfa_header = open(CFG_PDFA_DEF_PATH).read()
pdfa_header = pdfa_header.replace('<<<<TITLEMARKER>>>>', title)
outputpdf = os.path.join(working_dir, 'output_file.pdf')
open(os.path.join(working_dir, 'PDFA_def.ps'), 'w').write(pdfa_header)
execute_command(CFG_PATH_GS, '-sProcessColorModel=DeviceCMYK', '-dPDFA', '-dBATCH', '-dNOPAUSE', '-dNOOUTERSAVE', '-dUseCIEColor', '-sDEVICE=pdfwrite', '-dAutoRotatePages=/None', '-sOutputFile=output_file.pdf', os.path.join(working_dir, 'PDFA_def.ps'), input_file, cwd=working_dir)
if pdfopt:
execute_command(CFG_PATH_PDFOPT, outputpdf, output_file)
else:
shutil.move(outputpdf, output_file)
clean_working_dir(working_dir)
return output_file
def ps2pdf(input_file, output_file=None, pdfopt=True, **dummy):
"""
Transform any PS into a PDF
@param input_file [string] the input file name
@param output_file [string] the output_file file name, None for temporary generated
@param pdfopt [bool] whether to linearize the pdf, too.
@return [string] output_file input_file
raise InvenioWebSubmitFileConverterError in case of errors.
"""
input_file, output_file, working_dir = prepare_io(input_file, output_file, '.pdf')
if input_file.endswith('.gz'):
new_input_file = os.path.join(working_dir, 'input.ps')
execute_command(CFG_PATH_GUNZIP, '-c', input_file, filename_out=new_input_file)
input_file = new_input_file
outputpdf = os.path.join(working_dir, 'output_file.pdf')
execute_command(CFG_PATH_PS2PDF, input_file, outputpdf, cwd=working_dir)
if pdfopt:
execute_command(CFG_PATH_PDFOPT, outputpdf, output_file)
else:
shutil.move(outputpdf, output_file)
clean_working_dir(working_dir)
return output_file
def pdf2pdfhocr(input_pdf, text_hocr, output_pdf, rotations=None, font='Courier', draft=False):
"""
Adds the OCRed text to the original pdf.
@param rotations: a list of angles by which pages should be rotated
"""
def _get_page_rotation(i):
if len(rotations) > i:
return rotations[i]
return 0
if rotations is None:
rotations = []
input_pdf, hocr_pdf, dummy = prepare_io(input_pdf, output_ext='.pdf', need_working_dir=False)
create_pdf(extract_hocr(open(text_hocr).read()), hocr_pdf, font, draft)
input1 = PdfFileReader(file(input_pdf, "rb"))
input2 = PdfFileReader(file(hocr_pdf, "rb"))
output = PdfFileWriter()
info = input1.getDocumentInfo()
if info:
infoDict = output._info.getObject()
infoDict.update(info)
for i in range(0, input1.getNumPages()):
orig_page = input1.getPage(i)
text_page = input2.getPage(i)
angle = _get_page_rotation(i)
if angle != 0:
print >> sys.stderr, "Rotating page %d by %d degrees." % (i, angle)
text_page = text_page.rotateClockwise(angle)
if draft:
below, above = orig_page, text_page
else:
below, above = text_page, orig_page
below.mergePage(above)
if angle != 0 and not draft:
print >> sys.stderr, "Rotating back page %d by %d degrees." % (i, angle)
below.rotateCounterClockwise(angle)
output.addPage(below)
outputStream = file(output_pdf, "wb")
output.write(outputStream)
outputStream.close()
os.remove(hocr_pdf)
return output_pdf
def pdf2hocr2pdf(input_file, output_file=None, ln='en', return_working_dir=False, extract_only_text=False, pdfopt=True, font='Courier', draft=False, **dummy):
"""
Return the text content in input_file.
@param ln is a two letter language code to give the OCR tool a hint.
@param return_working_dir if set to True, will return output_file path and the working_dir path, instead of deleting the working_dir. This is useful in case you need the intermediate images to build again a PDF.
"""
def _perform_rotate(working_dir, imagefile, angle):
"""Rotate imagefile of the corresponding angle. Creates a new file
with rotated.ppm."""
get_file_converter_logger().debug('Performing rotate on %s by %s degrees' % (imagefile, angle))
if not angle:
#execute_command('%s %s %s', CFG_PATH_CONVERT, os.path.join(working_dir, imagefile), os.path.join(working_dir, 'rotated-%s' % imagefile))
shutil.copy(os.path.join(working_dir, imagefile), os.path.join(working_dir, 'rotated.ppm'))
else:
execute_command(CFG_PATH_CONVERT, os.path.join(working_dir, imagefile), '-rotate', str(angle), '-depth', str(8), os.path.join(working_dir, 'rotated.ppm'))
return True
def _perform_deskew(working_dir):
"""Perform ocroscript deskew. Expect to work on rotated-imagefile.
Creates deskewed.ppm.
Return True if deskewing was fine."""
get_file_converter_logger().debug('Performing deskew')
try:
dummy, stderr = execute_command_with_stderr(CFG_PATH_OCROSCRIPT, os.path.join(CFG_ETCDIR, 'websubmit', 'file_converter_templates', 'deskew.lua'), os.path.join(working_dir, 'rotated.ppm'), os.path.join(working_dir, 'deskewed.ppm'))
if stderr.strip():
get_file_converter_logger().debug('Errors found during deskewing')
return False
else:
return True
except InvenioWebSubmitFileConverterError, err:
get_file_converter_logger().debug('Deskewing error: %s' % err)
return False
def _perform_recognize(working_dir):
"""Perform ocroscript recognize. Expect to work on deskewed.ppm.
Creates recognized.out Return True if recognizing was fine."""
get_file_converter_logger().debug('Performing recognize')
if extract_only_text:
output_mode = 'text'
else:
output_mode = 'hocr'
try:
dummy, stderr = execute_command_with_stderr(CFG_PATH_OCROSCRIPT, 'recognize', '--tesslanguage=%s' % ln, '--output-mode=%s' % output_mode, os.path.join(working_dir, 'deskewed.ppm'), filename_out=os.path.join(working_dir, 'recognize.out'))
if stderr.strip():
## There was some output on stderr
get_file_converter_logger().debug('Errors found in recognize.err')
return False
return not guess_ocropus_produced_garbage(os.path.join(working_dir, 'recognize.out'), not extract_only_text)
except InvenioWebSubmitFileConverterError, err:
get_file_converter_logger().debug('Recognizer error: %s' % err)
return False
def _perform_dummy_recognize(working_dir):
"""Return an empty text or an empty hocr referencing the image."""
get_file_converter_logger().debug('Performing dummy recognize')
if extract_only_text:
out = ''
else:
out = """<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta content="ocr_line ocr_page" name="ocr-capabilities"/><meta content="en" name="ocr-langs"/><meta content="Latin" name="ocr-scripts"/><meta content="" name="ocr-microformats"/><title>OCR Output</title></head>
<body><div class="ocr_page" title="bbox 0 0 1 1; image deskewed.ppm">
</div></body></html>"""
open(os.path.join(working_dir, 'recognize.out'), 'w').write(out)
def _find_image_file(working_dir, imageprefix, page):
ret = '%s-%d.ppm' % (imageprefix, page)
if os.path.exists(os.path.join(working_dir, ret)):
return ret
ret = '%s-%02d.ppm' % (imageprefix, page)
if os.path.exists(os.path.join(working_dir, ret)):
return ret
ret = '%s-%03d.ppm' % (imageprefix, page)
if os.path.exists(os.path.join(working_dir, ret)):
return ret
ret = '%s-%04d.ppm' % (imageprefix, page)
if os.path.exists(os.path.join(working_dir, ret)):
return ret
ret = '%s-%05d.ppm' % (imageprefix, page)
if os.path.exists(os.path.join(working_dir, ret)):
return ret
ret = '%s-%06d.ppm' % (imageprefix, page)
if os.path.exists(os.path.join(working_dir, ret)):
return ret
## I guess we won't have documents with more than million pages
return None
def _ocr(tmp_output_file):
"""
Append to tmp_output_file the partial results of OCROpus recognize.
Return a list of rotations.
"""
page = 0
rotations = []
while True:
page += 1
get_file_converter_logger().debug('Page %d.' % page)
execute_command(CFG_PATH_PDFTOPPM, '-f', str(page), '-l', str(page), '-r', str(CFG_PPM_RESOLUTION), '-aa', 'yes', '-freetype', 'yes', input_file, os.path.join(working_dir, 'image'))
imagefile = _find_image_file(working_dir, 'image', page)
if imagefile == None:
break
for angle in (0, 180, 90, 270):
get_file_converter_logger().debug('Trying %d degrees...' % angle)
if _perform_rotate(working_dir, imagefile, angle) and _perform_deskew(working_dir) and _perform_recognize(working_dir):
rotations.append(angle)
break
else:
get_file_converter_logger().debug('Dummy recognize')
rotations.append(0)
_perform_dummy_recognize(working_dir)
open(tmp_output_file, 'a').write(open(os.path.join(working_dir, 'recognize.out')).read())
# clean
os.remove(os.path.join(working_dir, imagefile))
return rotations
if CFG_PATH_OCROSCRIPT:
if len(ln) == 2:
ln = CFG_TWO2THREE_LANG_CODES.get(ln, 'eng')
if extract_only_text:
input_file, output_file, working_dir = prepare_io(input_file, output_file, output_ext='.txt')
_ocr(output_file)
else:
input_file, tmp_output_hocr, working_dir = prepare_io(input_file, output_ext='.hocr')
rotations = _ocr(tmp_output_hocr)
if pdfopt:
input_file, tmp_output_pdf, dummy = prepare_io(input_file, output_ext='.pdf', need_working_dir=False)
tmp_output_pdf, output_file, dummy = prepare_io(tmp_output_pdf, output_file, output_ext='.pdf', need_working_dir=False)
pdf2pdfhocr(input_file, tmp_output_hocr, tmp_output_pdf, rotations=rotations, font=font, draft=draft)
pdf2pdfopt(tmp_output_pdf, output_file)
os.remove(tmp_output_pdf)
else:
input_file, output_file, dummy = prepare_io(input_file, output_file, output_ext='.pdf', need_working_dir=False)
pdf2pdfhocr(input_file, tmp_output_hocr, output_file, rotations=rotations, font=font, draft=draft)
clean_working_dir(working_dir)
return output_file
else:
raise InvenioWebSubmitFileConverterError("It's impossible to generate HOCR output from PDF. OCROpus is not available.")
def pdf2text(input_file, output_file=None, perform_ocr=True, ln='en', **dummy):
"""
Return the text content in input_file.
"""
input_file, output_file, dummy = prepare_io(input_file, output_file, '.txt', need_working_dir=False)
execute_command(CFG_PATH_PDFTOTEXT, '-enc', 'UTF-8', '-eol', 'unix', '-nopgbrk', input_file, output_file)
if perform_ocr and can_perform_ocr():
ocred_output = pdf2hocr2pdf(input_file, ln=ln, extract_only_text=True)
try:
output = open(output_file, 'a')
for row in open(ocred_output):
output.write(row)
output.close()
finally:
silent_remove(ocred_output)
return output_file
def txt2text(input_file, output_file=None, **dummy):
"""
Return the text content in input_file
"""
input_file, output_file, dummy = prepare_io(input_file, output_file, '.txt', need_working_dir=False)
shutil.copy(input_file, output_file)
return output_file
def html2text(input_file, output_file=None, **dummy):
"""
Return the text content of an HTML/XML file.
"""
class HTMLStripper(HTMLParser.HTMLParser):
def __init__(self, output_file):
HTMLParser.HTMLParser.__init__(self)
self.output_file = output_file
def handle_entityref(self, name):
if name in entitydefs:
self.output_file.write(entitydefs[name].decode('latin1').encode('utf8'))
def handle_data(self, data):
if data.strip():
self.output_file.write(_RE_CLEAN_SPACES.sub(' ', data))
def handle_charref(self, data):
try:
self.output_file.write(unichr(int(data)).encode('utf8'))
except:
pass
def close(self):
self.output_file.close()
HTMLParser.HTMLParser.close(self)
input_file, output_file, dummy = prepare_io(input_file, output_file, '.txt', need_working_dir=False)
html_stripper = HTMLStripper(open(output_file, 'w'))
for line in open(input_file):
html_stripper.feed(line)
html_stripper.close()
return output_file
def djvu2text(input_file, output_file=None, **dummy):
"""
Return the text content in input_file.
"""
input_file, output_file, dummy = prepare_io(input_file, output_file, '.txt', need_working_dir=False)
execute_command(CFG_PATH_DJVUTXT, input_file, output_file)
return output_file
def djvu2ps(input_file, output_file=None, level=2, compress=True, **dummy):
"""
Convert a djvu into a .ps[.gz]
"""
if compress:
input_file, output_file, working_dir = prepare_io(input_file, output_file, output_ext='.ps.gz')
try:
execute_command(CFG_PATH_DJVUPS, input_file, os.path.join(working_dir, 'output.ps'))
execute_command(CFG_PATH_GZIP, '-c', os.path.join(working_dir, 'output.ps'), filename_out=output_file)
finally:
clean_working_dir(working_dir)
else:
try:
input_file, output_file, working_dir = prepare_io(input_file, output_file, output_ext='.ps')
execute_command(CFG_PATH_DJVUPS, '-level=%i' % level, input_file, output_file)
finally:
clean_working_dir(working_dir)
return output_file
def tiff2pdf(input_file, output_file=None, pdfopt=True, pdfa=True, perform_ocr=True, **args):
"""
Convert a .tiff into a .pdf
"""
if pdfa or pdfopt or perform_ocr:
input_file, output_file, working_dir = prepare_io(input_file, output_file, '.pdf')
try:
partial_output = os.path.join(working_dir, 'output.pdf')
execute_command(CFG_PATH_TIFF2PDF, '-o', partial_output, input_file)
if perform_ocr:
pdf2hocr2pdf(partial_output, output_file, pdfopt=pdfopt, **args)
elif pdfa:
pdf2pdfa(partial_output, output_file, pdfopt=pdfopt, **args)
else:
pdfopt(partial_output, output_file)
finally:
clean_working_dir(working_dir)
else:
input_file, output_file, dummy = prepare_io(input_file, output_file, '.pdf', need_working_dir=False)
execute_command(CFG_PATH_TIFF2PDF, '-o', output_file, input_file)
return output_file
def pstotext(input_file, output_file=None, **dummy):
"""
Convert a .ps[.gz] into text.
"""
input_file, output_file, working_dir = prepare_io(input_file, output_file, '.txt')
try:
if input_file.endswith('.gz'):
new_input_file = os.path.join(working_dir, 'input.ps')
execute_command(CFG_PATH_GUNZIP, '-c', input_file, filename_out=new_input_file)
input_file = new_input_file
execute_command(CFG_PATH_PSTOTEXT, '-output', output_file, input_file)
finally:
clean_working_dir(working_dir)
return output_file
def gzip(input_file, output_file=None, **dummy):
"""
Compress a file.
"""
input_file, output_file, dummy = prepare_io(input_file, output_file, '.gz', need_working_dir=False)
execute_command(CFG_PATH_GZIP, '-c', input_file, filename_out=output_file)
return output_file
def gunzip(input_file, output_file=None, **dummy):
"""
Uncompress a file.
"""
from invenio.bibdocfile import decompose_file
input_ext = decompose_file(input_file, skip_version=True)[2]
if input_ext.endswith('.gz'):
input_ext = input_ext[:-len('.gz')]
else:
input_ext = None
input_file, output_file, dummy = prepare_io(input_file, output_file, input_ext, need_working_dir=False)
execute_command(CFG_PATH_GUNZIP, '-c', input_file, filename_out=output_file)
return output_file
def prepare_io(input_file, output_file=None, output_ext=None, need_working_dir=True):
"""Clean input_file and the output_file."""
from invenio.bibdocfile import decompose_file, normalize_format
output_ext = normalize_format(output_ext)
get_file_converter_logger().debug('Preparing IO for input=%s, output=%s, output_ext=%s' % (input_file, output_file, output_ext))
if output_ext is None:
if output_file is None:
output_ext = '.tmp'
else:
output_ext = decompose_file(output_file, skip_version=True)[2]
if output_file is None:
try:
(fd, output_file) = tempfile.mkstemp(suffix=output_ext, dir=CFG_TMPDIR)
os.close(fd)
except IOError, err:
raise InvenioWebSubmitFileConverterError("It's impossible to create a temporary file: %s" % err)
else:
output_file = os.path.abspath(output_file)
if os.path.exists(output_file):
os.remove(output_file)
if need_working_dir:
try:
working_dir = tempfile.mkdtemp(dir=CFG_TMPDIR, prefix='conversion')
except IOError, err:
raise InvenioWebSubmitFileConverterError("It's impossible to create a temporary directory: %s" % err)
input_ext = decompose_file(input_file, skip_version=True)[2]
new_input_file = os.path.join(working_dir, 'input' + input_ext)
shutil.copy(input_file, new_input_file)
input_file = new_input_file
else:
working_dir = None
input_file = os.path.abspath(input_file)
get_file_converter_logger().debug('IO prepared: input_file=%s, output_file=%s, working_dir=%s' % (input_file, output_file, working_dir))
return (input_file, output_file, working_dir)
def clean_working_dir(working_dir):
"""
Remove the working_dir.
"""
get_file_converter_logger().debug('Cleaning working_dir: %s' % working_dir)
shutil.rmtree(working_dir)
def execute_command(*args, **argd):
"""Wrapper to run_process_with_timeout."""
get_file_converter_logger().debug("Executing: %s" % (args, ))
args = [str(arg) for arg in args]
res, stdout, stderr = run_process_with_timeout(args, cwd=argd.get('cwd'), filename_out=argd.get('filename_out'), filename_err=argd.get('filename_err'), sudo=argd.get('sudo'))
get_file_converter_logger().debug('res: %s, stdout: %s, stderr: %s' % (res, stdout, stderr))
if res != 0:
message = "ERROR: Error in running %s\n stdout:\n%s\nstderr:\n%s\n" % (args, stdout, stderr)
get_file_converter_logger().error(message)
raise InvenioWebSubmitFileConverterError(message)
return stdout
def execute_command_with_stderr(*args, **argd):
"""Wrapper to run_process_with_timeout."""
get_file_converter_logger().debug("Executing: %s" % (args, ))
res, stdout, stderr = run_process_with_timeout(args, cwd=argd.get('cwd'), filename_out=argd.get('filename_out'), sudo=argd.get('sudo'))
if res != 0:
message = "ERROR: Error in running %s\n stdout:\n%s\nstderr:\n%s\n" % (args, stdout, stderr)
get_file_converter_logger().error(message)
raise InvenioWebSubmitFileConverterError(message)
return stdout, stderr
def silent_remove(path):
"""Remove without errors a path."""
if os.path.exists(path):
try:
os.remove(path)
except OSError:
pass
__CONVERSION_MAP = get_conversion_map()
def main_cli():
"""
main function when the library behaves as a normal CLI tool.
"""
from invenio.bibdocfile import normalize_format
parser = OptionParser()
parser.add_option("-c", "--convert", dest="input_name",
help="convert the specified FILE", metavar="FILE")
parser.add_option("-d", "--debug", dest="debug", action="store_true", help="Enable debug information")
parser.add_option("--special-pdf2hocr2pdf", dest="ocrize", help="convert the given scanned PDF into a PDF with OCRed text", metavar="FILE")
parser.add_option("-f", "--format", dest="output_format", help="the desired output format", metavar="FORMAT")
parser.add_option("-o", "--output", dest="output_name", help="the desired output FILE (if not specified a new file will be generated with the desired output format)")
parser.add_option("--without-pdfa", action="store_false", dest="pdf_a", default=True, help="don't force creation of PDF/A PDFs")
parser.add_option("--without-pdfopt", action="store_false", dest="pdfopt", default=True, help="don't force optimization of PDFs files")
parser.add_option("--without-ocr", action="store_false", dest="ocr", default=True, help="don't force OCR")
parser.add_option("--can-convert", dest="can_convert", help="display all the possible format that is possible to generate from the given format", metavar="FORMAT")
parser.add_option("--is-ocr-needed", dest="check_ocr_is_needed", help="check if OCR is needed for the FILE specified", metavar="FILE")
parser.add_option("-t", "--title", dest="title", help="specify the title (used when creating PDFs)", metavar="TITLE")
parser.add_option("-l", "--language", dest="ln", help="specify the language (used when performing OCR, e.g. en, it, fr...)", metavar="LN", default='en')
(options, dummy) = parser.parse_args()
if options.debug:
from logging import basicConfig
basicConfig()
get_file_converter_logger().setLevel(DEBUG)
if options.can_convert:
if options.can_convert:
input_format = normalize_format(options.can_convert)
if input_format == '.pdf':
if can_pdfopt(True):
print "PDF linearization supported"
else:
print "No PDF linearization support"
if can_pdfa(True):
print "PDF/A generation supported"
else:
print "No PDF/A generation support"
if can_perform_ocr(True):
print "OCR supported"
else:
print "OCR not supported"
print 'Can convert from "%s" to:' % input_format[1:],
for output_format in __CONVERSION_MAP:
if can_convert(input_format, output_format):
print '"%s"' % output_format[1:],
print
elif options.check_ocr_is_needed:
print "Checking if OCR is needed on %s..." % options.check_ocr_is_needed,
sys.stdout.flush()
if guess_is_OCR_needed(options.check_ocr_is_needed):
print "needed."
else:
print "not needed."
elif options.ocrize:
try:
output = pdf2hocr2pdf(options.ocrize, output_file=options.output_name, title=options.title, ln=options.ln)
print "Output stored in %s" % output
except InvenioWebSubmitFileConverterError, err:
print "ERROR: %s" % err
sys.exit(1)
else:
try:
if not options.output_name and not options.output_format:
parser.error("Either --format, --output should be specified")
if not options.input_name:
parser.error("An input should be specified!")
output = convert_file(options.input_name, output_file=options.output_name, output_format=options.output_format, pdfopt=options.pdfopt, pdfa=options.pdf_a, title=options.title, ln=options.ln)
print "Output stored in %s" % output
except InvenioWebSubmitFileConverterError, err:
print "ERROR: %s" % err
sys.exit(1)
if __name__ == "__main__":
main_cli()

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