Web   ·   Wiki   ·   Activities   ·   Blog   ·   Lists   ·   Chat   ·   Meeting   ·   Bugs   ·   Git   ·   Translate   ·   Archive   ·   People   ·   Donate
summaryrefslogtreecommitdiffstats
path: root/model.py
blob: 7c91107afa2da003b339c42fd6df9a221f5ade6d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
#
#    Copyright (C) 2006, 2007, One Laptop Per Child
#
#    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., 675 Mass Ave, Cambridge, MA 02139, USA.
#

import libxml2
import os
import logging
import base64


_logger = logging.getLogger('model')


class Model(object):
    ''' The model of the activity. Contains methods to read and write
    the configuration for a browser session to and from xml. 
    '''
    
    def __init__(self, dtdpath):
        self.links = []
        self.data = {}
        self.dtdpath = dtdpath
        self.data['name'] = 'first'
        self.session_data = ''
        
        try:
            self.dtd = libxml2.parseDTD(None, os.path.join(self.dtdpath, 'browser.dtd'))
        except libxml2.parserError, e:
            _logger.error('Init: no browser.dtd found ' +str(e))
            self.dtd = None
        self.ctxt = libxml2.newValidCtxt()               

    def read(self, filepath):
        ''' reads the configuration from an xml file '''
        
        try:
            doc = libxml2.parseFile(filepath)
            if doc.validateDtd(self.ctxt, self.dtd):
        
                # get the requested nodes
                xpa = doc.xpathNewContext()
                res = xpa.xpathEval("//*")

                # write their content to the data structure
                for elem in res:
                    attributes = elem.get_properties()
                    if( elem.name == 'link' ):
                        for attribute in attributes:
                            if(attribute.name == 'hash'):
                                hash = attribute.content
                            elif(attribute.name == 'url'):
                                url = attribute.content
                            elif(attribute.name == 'title'):
                                title = attribute.content                               
                            elif(attribute.name == 'thumb'):
                                thumb = base64.b64decode(attribute.content)                                
                            elif(attribute.name == 'owner'):
                                owner = attribute.content
                            elif(attribute.name == 'color'):
                                color = attribute.content
                            elif(attribute.name == 'deleted'):
                                deleted = int(attribute.content)
                                
                        self.links.append( {'hash':hash, 'url':url, 'title':title, 'thumb':thumb,
                                            'owner':owner, 'color':color, 'deleted':deleted} )
                
                    elif( elem.name == 'session' ):
                        for attribute in attributes:
                            if(attribute.name == 'data'):                            
                                self.session_data = attribute.content
                        
                    elif( elem.name == 'browser' ):
                        for attribute in attributes:
                            if(attribute.name == 'name'):                            
                                self.data['name'] = attribute.content
                                
                xpa.xpathFreeContext()
            else:
                _logger.error('Read: Error in validation of the file')
                doc.freeDoc()
                return 1
            doc.freeDoc()
            return 0
        except libxml2.parserError, e:
            _logger.error('Read: Error parsing file ' +str(e))
            return 2
        
                
    def write(self, filepath):
        ''' writes the configuration to an xml file '''
        doc = libxml2.newDoc("1.0")
        root = doc.newChild(None, "browser", None)
        
        if(self.data.get('name', None) != None):                            
            root.setProp("name", self.data['name'])
        else:
            _logger.error('Write: No name is specified. Can not write session.')
            return 1

        elem = root.newChild(None, "session", None)
        elem.setProp("data", self.session_data)

        for link in self.links:
            elem = root.newChild(None, "link", None)
            elem.setProp("hash", link['hash'])
            elem.setProp("url", link['url'])
            elem.setProp("title", link['title'])
            elem.setProp("thumb", base64.b64encode(link['thumb']))
            elem.setProp("owner", link['owner'])
            elem.setProp("color", link['color'])
            elem.setProp("deleted", str(link['deleted']))
                        
        if doc.validateDtd(self.ctxt, self.dtd):
            doc.saveFormatFile(filepath, 1)
        else:
            _logger.error('Write: Error in validation of the file')
            doc.freeDoc()
            return 2
        doc.freeDoc()
        return 0
        

    
if __name__ == '__main__':
    model = Model(os.path.dirname(__file__))

    filepath = 'sports.png'

    target = os.open(filepath, os.O_RDONLY)
    filelen = os.stat(filepath).st_size
    data = os.read(target, filelen)
    os.close(target)

    '''
    import sha
    url = 'www.sport.de'
    title = 'sports'
    hash = sha.new(url)
    model.links.append({'hash':hash.hexdigest(), 'url':url, 'title':title})

    url = 'www.jazz.de'
    title = 'more on jazz'
    hash = sha.new(url)
    model.links.append({'hash':hash.hexdigest(), 'url':url, 'title':title})

    url = 'www.taz.de'
    title = 'die zeitung'
    hash = sha.new(url)
    model.links.append({'hash':hash.hexdigest(), 'url':url, 'title':title})
                        
    model.write('/tmp/test.bwr')
    '''
    
    model.read('/tmp/test.bwr')

    model.links.remove(model.links[1])
    
    print model.links