#!/usr/bin/env python
# Copyright (C) 2014 J.F.Dockes
# This program 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.
#
# This program 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 this program; if not, write to the
# Free Software Foundation, Inc.,
# 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
# Recoll PDF extractor, with support for attachments
from __future__ import print_function
import os
import sys
import re
import rclexecm
import subprocess
import tempfile
import atexit
import signal
tmpdir = None
def finalcleanup():
if tmpdir:
vacuumdir(tmpdir)
os.rmdir(tmpdir)
def signal_handler(signal, frame):
sys.exit(1)
atexit.register(finalcleanup)
try:
signal.signal(signal.SIGHUP, signal_handler)
except:
pass
try:
signal.signal(signal.SIGINT, signal_handler)
except:
pass
try:
signal.signal(signal.SIGQUIT, signal_handler)
except:
pass
try:
signal.signal(signal.SIGTERM, signal_handler)
except:
pass
def vacuumdir(dir):
if dir:
for fn in os.listdir(dir):
path = os.path.join(dir, fn)
if os.path.isfile(path):
os.unlink(path)
return True
class PDFExtractor:
def __init__(self, em):
self.currentindex = 0
self.pdftotext = ""
self.pdftk = ""
self.em = em
self.attextractdone = False
self.attachlist = []
# Extract all attachments if any into temporary directory
def extractAttach(self):
if self.attextractdone:
return True
self.attextractdone = True
global tmpdir
if not tmpdir or not self.pdftk:
# no big deal
return True
try:
vacuumdir(tmpdir)
subprocess.check_call([self.pdftk, self.filename, "unpack_files",
"output", tmpdir])
self.attachlist = sorted(os.listdir(tmpdir))
return True
except Exception as e:
self.em.rclog("extractAttach: failed: %s" % e)
# Return true anyway, pdf attachments are no big deal
return True
def extractone(self, ipath):
#self.em.rclog("extractone: [%s]" % ipath)
if not self.attextractdone:
if not self.extractAttach():
return (False, "", "", rclexecm.RclExecM.eofnow)
path = os.path.join(tmpdir, ipath)
if os.path.isfile(path):
f = open(path)
docdata = f.read();
f.close()
if self.currentindex == len(self.attachlist) - 1:
eof = rclexecm.RclExecM.eofnext
else:
eof = rclexecm.RclExecM.noteof
return (True, docdata, ipath, eof)
# pdftotext (used to?) badly escape text inside the header
# fields. We do it here. This is not an html parser, and depends a
# lot on the actual format output by pdftotext.
def _fixhtml(self, input):
#print input
inheader = False
inbody = False
didcs = False
output = b''
cont = b''
for line in input.split(b'\n'):
line = cont + line
cont = b''
if re.search(b'</head>', line):
inheader = False
if re.search(b'</pre>', line):
inbody = False
if inheader:
if not didcs:
output += b'<meta http-equiv="Content-Type"' + \
b'content="text/html; charset=UTF-8">\n'
didcs = True
m = re.search(rb'(.*<title>)(.*)(<\/title>.*)', line)
if not m:
m = re.search(rb'(.*content=")(.*)(".*/>.*)', line)
if m:
line = m.group(1) + self.em.htmlescape(m.group(2)) + \
m.group(3)
# Recoll treats "Subject" as a "title" element
# (based on emails). The PDF "Subject" metadata
# field is more like an HTML "description"
line = re.sub(b'name="Subject"', b'name="Description"', line, 1)
elif inbody:
# Remove end-of-line hyphenation. It's not clear that
# we should do this as pdftotext without the -layout
# option does it ?
#if re.search(r'[-]$', line):
#m = re.search(r'(.*)[ \t]([^ \t]+)$', line)
#if m:
#line = m.group(1)
#cont = m.group(2).rstrip('-')
line = self.em.htmlescape(line)
if re.search(b'<head>', line):
inheader = True
if re.search(b'<pre>', line):
inbody = True
output += line + b'\n'
return output
def _selfdoc(self):
self.em.setmimetype('text/html')
if self.attextractdone and len(self.attachlist) == 0:
eof = rclexecm.RclExecM.eofnext
else:
eof = rclexecm.RclExecM.noteof
data = subprocess.check_output([self.pdftotext, "-htmlmeta", "-enc",
"UTF-8", "-eol", "unix", "-q",
self.filename, "-"])
data = self._fixhtml(data)
#self.em.rclog("%s" % data)
return (True, data, "", eof)
###### File type handler api, used by rclexecm ---------->
def openfile(self, params):
self.filename = params["filename:"]
#self.em.rclog("openfile: [%s]" % self.filename)
self.currentindex = -1
self.attextractdone = False
if not self.pdftotext:
self.pdftotext = rclexecm.which("pdftotext")
if not self.pdftotext:
self.pdftotext = rclexecm.which("poppler/pdftotext")
if not self.pdftotext:
print("RECFILTERROR HELPERNOTFOUND pdftotext")
sys.exit(1);
if not self.pdftk:
self.pdftk = rclexecm.which("pdftk")
if self.pdftk:
global tmpdir
if tmpdir:
if not vacuumdir(tmpdir):
self.em.rclog("openfile: vacuumdir %s failed" % tmpdir)
return False
else:
tmpdir = tempfile.mkdtemp(prefix='rclmpdf')
preview = os.environ.get("RECOLL_FILTER_FORPREVIEW", "no")
if preview != "yes":
# When indexing, extract attachments at once. This
# will be needed anyway and it allows generating an
# eofnext error instead of waiting for actual eof,
# which avoids a bug in recollindex up to 1.20
self.extractAttach()
else:
self.attextractdone = True
return True
def getipath(self, params):
ipath = params["ipath:"]
ok, data, ipath, eof = self.extractone(ipath)
return (ok, data, ipath, eof)
def getnext(self, params):
# self.em.rclog("getnext: current %d" % self.currentindex)
if self.currentindex == -1:
self.currentindex = 0
return self._selfdoc()
else:
self.em.setmimetype('')
if not self.attextractdone:
if not self.extractAttach():
return (False, "", "", rclexecm.RclExecM.eofnow)
if self.currentindex >= len(self.attachlist):
return (False, "", "", rclexecm.RclExecM.eofnow)
try:
ok, data, ipath, eof = \
self.extractone(self.attachlist[self.currentindex])
self.currentindex += 1
#self.em.rclog("getnext: returning ok for [%s]" % ipath)
return (ok, data, ipath, eof)
except:
return (False, "", "", rclexecm.RclExecM.eofnow)
# Main program: create protocol handler and extractor and run them
proto = rclexecm.RclExecM()
extract = PDFExtractor(proto)
rclexecm.main(proto, extract)