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#!/usr/bin/python3
# -*- coding: utf-8 -*-
# Copyright (C) 2006-2009 Søren Roug, European Environment Agency
#
# This is free software.  You may redistribute it under the terms
# of the Apache license and the GNU General Public License Version
# 2 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
#
# Contributor(s):
#
import zipfile, time, sys, getopt, re
import xml.sax, xml.sax.saxutils
from odf.namespaces import TOOLSVERSION, OFFICENS, XLINKNS, DCNS, METANS
from io import BytesIO

OUTENCODING="utf-8"

whitespace = re.compile(r'\s+')

fields = {
'title':            (DCNS,u'title'),
'description':      (DCNS,u'description'),
'subject':          (DCNS,u'subject'),
'creator':          (DCNS,u'creator'),
'date':             (DCNS,u'date'),
'language':         (DCNS,u'language'),
'generator':        (METANS,u'generator'),
'initial-creator':  (METANS,u'initial-creator'),
'keyword':          (METANS,u'keyword'),
'editing-duration': (METANS,u'editing-duration'),
'editing-cycles':   (METANS,u'editing-cycles'),
'printed-by':       (METANS,u'printed-by'),
'print-date':       (METANS,u'print-date'),
'creation-date':    (METANS,u'creation-date'),
'user-defined':     (METANS,u'user-defined'),
#'template':         (METANS,u'template'),
}

xfields = []
Xfields = []
addfields = {}
deletefields = {}
yieldfields = {}
showversion = None

def exitwithusage(exitcode=2):
    """ print out usage information """
    sys.stderr.write("Usage: %s [-cdlvV] [-xXaAI metafield]... [-o output] [inputfile]\n" % sys.argv[0])
    sys.stderr.write("\tInputfile must be OpenDocument format\n")
    sys.exit(exitcode)

def normalize(str):
    """ 
    The normalize-space function returns the argument string with whitespace
    normalized by stripping leading and trailing whitespace and replacing
    sequences of whitespace characters by a single space.
    """
    return whitespace.sub(' ', str).strip()

class MetaCollector:
    """
    The MetaCollector is a pseudo file object, that can temporarily ignore write-calls
    It could probably be replaced with a StringIO object.
    """
    def __init__(self):
        self._content = []
        self.dowrite = True

    def write(self, str):
        if self.dowrite:
            self._content.append(str)

    def content(self):
        return ''.join(self._content)


base = xml.sax.saxutils.XMLGenerator

class odfmetaparser(base):
    """ Parse a meta.xml file with an event-driven parser and replace elements.
        It would probably be a cleaner approach to use a DOM based parser and
        then manipulate in memory.
        Small issue: Reorders elements
    """
    version = 'Unknown'

    def __init__(self):
        self._mimetype = ''
        self.output = MetaCollector()
        self._data = []
        self.seenfields = {}
        base.__init__(self, self.output, OUTENCODING)

    def startElementNS(self, name, qname, attrs):
        self._data = []
        field = name
# I can't modify the template until the tool replaces elements at the same
# location and not at the end
#       if name == (METANS,u'template'):
#           self._data = [attrs.get((XLINKNS,u'title'),'')]
        if showversion and name == (OFFICENS,u'document-meta'):
            if showversion == '-V':
                print ("version:%s" % attrs.get((OFFICENS,u'version'),'Unknown').decode('utf-8'))
            else:
                print ("%s" % attrs.get((OFFICENS,u'version'),'Unknown').decode('utf-8'))
        if name == (METANS,u'user-defined'):
            field = attrs.get((METANS,u'name'))
        if field in deletefields:
            self.output.dowrite = False
        elif field in yieldfields:
            del addfields[field]
            base.startElementNS(self, name, qname, attrs)
        else:
            base.startElementNS(self, name, qname, attrs)
        self._tag = field

    def endElementNS(self, name, qname):
        field = name
        if name == (METANS,u'user-defined'):
            field = self._tag
        if name == (OFFICENS,u'meta'):
            for k,v in addfields.items():
                if len(v) > 0:
                    if type(k) == type(''):
                        base.startElementNS(self,(METANS,u'user-defined'),None,{(METANS,u'name'):k})
                        base.characters(self, v)
                        base.endElementNS(self, (METANS,u'user-defined'),None)
                    else:
                        base.startElementNS(self, k, None, {})
                        base.characters(self, v)
                        base.endElementNS(self, k, None)
        if name in xfields:
                print ("%s" % self.data())
        if name in Xfields:
            if isinstance(self._tag, tuple):
                texttag = self._tag[1]
            else:
                texttag = self._tag
            print ("%s:%s" % (texttag, self.data()))
        if field in deletefields:
            self.output.dowrite = True
        else:
            base.endElementNS(self, name, qname)

    def characters(self, content):
        base.characters(self, content)
        self._data.append(content)

    def meta(self):
        return self.output.content()

    def data(self):
        if usenormalize:
            return normalize(''.join(self._data))
        else:
            return ''.join(self._data)

now = time.localtime()[:6]
outputfile = "-"
writemeta = False   # Do we change any meta data?
usenormalize = False

try:
    opts, args = getopt.getopt(sys.argv[1:], "cdlvVI:A:a:o:x:X:")
except getopt.GetoptError:
    exitwithusage()

if len(opts) == 0:
    opts = [ ('-l','') ]

for o, a in opts:
    if o in ('-a','-A','-I'):
        writemeta = True
        if a.find(":") >= 0:
            k,v = a.split(":",1)
        else:
            k,v = (a, "")
        if len(k) == 0:
            exitwithusage()
        k = fields.get(k,k)
        addfields[k] = unicode(v,'utf-8')
    if o == '-a':
        yieldfields[k] = True
    if o == '-I':
        deletefields[k] = True
    if o == '-d':
        writemeta = True
        addfields[(DCNS,u'date')] = "%04d-%02d-%02dT%02d:%02d:%02d" % now
        deletefields[(DCNS,u'date')] = True
    if o == '-c':
        usenormalize = True
    if o in ('-v', '-V'):
        showversion = o
    if o == '-l':
        Xfields = fields.values()
    if o == "-x":
        xfields.append(fields.get(a,a))
    if o == "-X":
        Xfields.append(fields.get(a,a))
    if o == "-o":
        outputfile = a

# The specification says we should change the element to our own,
# and must not export the original identifier.
if writemeta:
    addfields[(METANS,u'generator')] = TOOLSVERSION
    deletefields[(METANS,u'generator')] = True

odfs = odfmetaparser()
parser = xml.sax.make_parser()
parser.setFeature(xml.sax.handler.feature_namespaces, 1)
parser.setContentHandler(odfs)

if len(args) == 0:
    zin = zipfile.ZipFile(sys.stdin,'r')
else:
    if not zipfile.is_zipfile(args[0]):
        exitwithusage()
    zin = zipfile.ZipFile(args[0], 'r')

try:
    content = zin.read('meta.xml').decode('utf-8')
except:
    sys.stderr.write("File has no meta data\n")
    sys.exit(1)
parser.parse(BytesIO(content.encode('utf-8')))

if writemeta:
    if outputfile == '-':
        if sys.stdout.isatty():
           sys.stderr.write("Won't write ODF file to terminal\n")
           sys.exit(1)
        zout = zipfile.ZipFile(sys.stdout,"w")
    else:
        zout = zipfile.ZipFile(outputfile,"w")



    # Loop through the input zipfile and copy the content to the output until we
    # get to the meta.xml. Then substitute.
    for zinfo in zin.infolist():
        if zinfo.filename == "meta.xml":
            # Write meta
            zi = zipfile.ZipInfo("meta.xml", now)
            zi.compress_type = zipfile.ZIP_DEFLATED
            zout.writestr(zi,odfs.meta() )
        else:
            payload = zin.read(zinfo.filename)
            zout.writestr(zinfo, payload)

    zout.close()
zin.close()


# Local Variables: ***
# mode: python     ***
# End:             ***