MythTV  master
hubbleCast_api.py
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1 #!/usr/bin/env python
2 # -*- coding: UTF-8 -*-
3 # ----------------------
4 # Name: hubbleCast_api - XPath and XSLT functions for the HubbleCast RSS/HTML items
5 # Python Script
6 # Author: R.D. Vaughan
7 # Purpose: This python script is intended to perform a variety of utility functions
8 # for the conversion of data to the MNV standard RSS output format.
9 # See this link for the specifications:
10 # http://www.mythtv.org/wiki/MythNetvision_Grabber_Script_Format
11 #
12 # License:Creative Commons GNU GPL v2
13 # (http://creativecommons.org/licenses/GPL/2.0/)
14 #-------------------------------------
15 __title__ ="hubbleCast_api - XPath and XSLT functions for the HubbleCast RSS/HTML"
16 __author__="R.D. Vaughan"
17 __purpose__='''
18 This python script is intended to perform a variety of utility functions
19 for the conversion of data to the MNV standard RSS output format.
20 See this link for the specifications:
21 http://www.mythtv.org/wiki/MythNetvision_Grabber_Script_Format
22 '''
23 
24 __version__="v0.1.0"
25 # 0.1.0 Initial development
26 
27 
28 # Specify the class names that have XPath extention functions
29 __xpathClassList__ = ['xpathFunctions', ]
30 
31 # Specify the XSLT extention class names. Each class is a stand lone extention function
32 #__xsltExtentionList__ = ['xsltExtExample', ]
33 __xsltExtentionList__ = []
34 
35 import os, sys, re, time, datetime, shutil, urllib, string
36 from copy import deepcopy
37 
38 
39 class OutStreamEncoder(object):
40  """Wraps a stream with an encoder"""
41  def __init__(self, outstream, encoding=None):
42  self.out = outstream
43  if not encoding:
44  self.encoding = sys.getfilesystemencoding()
45  else:
46  self.encoding = encoding
47 
48  def write(self, obj):
49  """Wraps the output stream, encoding Unicode strings with the specified encoding"""
50  if isinstance(obj, unicode):
51  try:
52  self.out.write(obj.encode(self.encoding))
53  except IOError:
54  pass
55  else:
56  try:
57  self.out.write(obj)
58  except IOError:
59  pass
60 
61  def __getattr__(self, attr):
62  """Delegate everything but write to the stream"""
63  return getattr(self.out, attr)
64 sys.stdout = OutStreamEncoder(sys.stdout, 'utf8')
65 sys.stderr = OutStreamEncoder(sys.stderr, 'utf8')
66 
67 try:
68  from StringIO import StringIO
69  from lxml import etree
70 except Exception, e:
71  sys.stderr.write(u'\n! Error - Importing the "lxml" and "StringIO" python libraries failed on error(%s)\n' % e)
72  sys.exit(1)
73 
74 # Check that the lxml library is current enough
75 # From the lxml documents it states: (http://codespeak.net/lxml/installation.html)
76 # "If you want to use XPath, do not use libxml2 2.6.27. We recommend libxml2 2.7.2 or later"
77 # Testing was performed with the Ubuntu 9.10 "python-lxml" version "2.1.5-1ubuntu2" repository package
78 version = ''
79 for digit in etree.LIBXML_VERSION:
80  version+=str(digit)+'.'
81 version = version[:-1]
82 if version < '2.7.2':
83  sys.stderr.write(u'''
84 ! Error - The installed version of the "lxml" python library "libxml" version is too old.
85  At least "libxml" version 2.7.2 must be installed. Your version is (%s).
86 ''' % version)
87  sys.exit(1)
88 
89 
90 class xpathFunctions(object):
91  """Functions specific extending XPath
92  """
93  def __init__(self):
94  self.functList = ['hubbleCastLinkGeneration', ]
95  self.namespaces = {
96  'atom': "http://www.w3.org/2005/Atom",
97  'atom10': "http://www.w3.org/2005/Atom",
98  'media': "http://search.yahoo.com/mrss/",
99  'itunes':"http://www.itunes.com/dtds/podcast-1.0.dtd",
100  'xhtml': "http://www.w3.org/1999/xhtml",
101  'mythtv': "http://www.mythtv.org/wiki/MythNetvision_Grabber_Script_Format",
102  'feedburner': "http://rssnamespace.org/feedburner/ext/1.0",
103  'amp': "http://www.adobe.com/amp/1.0",
104  }
105  # end __init__()
106 
107 
112 
113  def hubbleCastLinkGeneration(self, context, *arg):
114  '''Generate a link for the video.
115  Call example: 'mnvXpath:hubbleCastLinkGeneration(string(guid))'
116  return the url link
117  '''
118  guidURL = arg[0]
119  index = guidURL.find('.m4v')
120  if index != -1:
121  index2 = guidURL.rfind('/')
122  return u'%s%s' % (common.linkWebPage('dummy', 'hubble'), guidURL[index2+1:index])
123  elif guidURL[len(guidURL)-1] == '/':
124  index2 = guidURL[:-1].rfind('/')
125  return u'%s%s' % (common.linkWebPage('dummy', 'hubble'), guidURL[index2+1:-1])
126  else:
127  return guidURL
128  # end hubbleCastLinkGeneration()
129 
130 
135 
136 
141 
142 
def hubbleCastLinkGeneration(self, context, *arg)
Start of XPath extension functions.