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pdftk.py
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Mon, Sep 2, 01:34
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R3600 invenio-infoscience
pdftk.py
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# -*- coding: utf-8 -*-
##
## This file is part of Invenio.
## Copyright (C) 2013, 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.
from
flask
import
current_app
,
jsonify
,
request
,
safe_join
from
invenio.base.globals
import
cfg
from
invenio.utils.shell
import
run_shell_command
# FIXME: subprocess.Popen
from
..tasks
import
generate_preview
from
..utils
import
get_pdf_path
def
can_preview
(
f
):
'''Returns True for PDFs, False for others'''
if
f
.
superformat
==
'.pdf'
:
return
True
return
False
def
preview
(
f
):
generate_preview
(
f
)
# FIXME: call as Celery task at record upload time?
return
send_pdf_image_data
(
current_app
.
instance_path
+
"/previews/"
+
str
(
f
.
get_recid
()))
def
send_pdf_image_data
(
directory
):
try
:
raw_file
=
open
(
safe_join
(
directory
,
"pg_"
+
request
.
args
.
get
(
'page'
,
default
=
'1'
,
type
=
str
)
+
".png"
),
'r'
)
# FIXME: use Documents to store previews
import
base64
return
base64
.
b64encode
(
raw_file
.
read
())
except
IOError
:
return
'404'
,
'Not Found'
def
maxpage
(
f
):
"""Returns the number of pages for PDF records via AJAX"""
cmd_pdftk
=
'
%s
%s
dump_data output | grep NumberOfPages'
pdf
=
get_pdf_path
(
f
)
if
pdf
is
not
None
:
(
exit_status
,
output_std
,
output_err
)
=
\
run_shell_command
(
cmd_pdftk
,
args
=
(
str
(
cfg
[
'CFG_PATH_PDFTK'
]),
pdf
))
if
int
(
exit_status
)
==
0
and
len
(
output_err
)
==
0
:
return
jsonify
(
maxpage
=
int
(
output_std
.
strip
()
.
split
(
' '
)[
1
]))
return
jsonify
(
maxpage
=-
1
)
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