5 # Permission is hereby granted, free of charge, to any person obtaining a copy
6 # of this software and associated documentation files (the "Software"), to deal
7 # in the Software without restriction, including without limitation the rights
8 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 # copies of the Software, and to permit persons to whom the Software is
10 # furnished to do so, subject to the following conditions:
12 # The above copyright notice and this permission notice shall be included in
13 # all copies or substantial portions of the Software.
15 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
27 class InvalidICS(Exception): pass
28 class notJoined(Exception): pass
30 def lineJoiner(oldcal):
31 '''Takes a string containing a calendar and returns an array of its lines'''
33 if not oldcal[0:15] == 'BEGIN:VCALENDAR':
34 raise InvalidICS, "Does not appear to be a valid ICS file"
36 if list(oldcal) == oldcal:
37 oldcal = '\r\n'.join(oldcal)
39 oldcal.replace('\r\n ', '')
40 return oldcal.split('\r\n')
43 def lineFolder(oldcal, length=75):
44 '''Folds content lines to a specified length, returns a list'''
47 sys.stderr.write('WARN: lines > 75 octets are not RFC compliant\n')
53 # Line fits inside length, do nothing
54 if len(line.rstrip()) <= length:
57 brokenline = [line[0:length] + '\r\n']
59 while ll < len(line.rstrip('\r\n')) + 1:
60 brokenline.append(' ' + line[ll:sl+ll].rstrip('\r\n') + '\r\n')
66 def getContent(url='',stdin=False):
67 '''Generic content retriever, DO NOT use this function in a CGI script as
68 it can read from the local disk (which you probably don't want it to).
71 # Special case, if this is a HTTP url, return the data from it using
72 # the HTTP functions which attempt to play a bit nicer.
73 parsedURL = urlparse.urlparse(url)
74 if 'http' in parsedURL[0]: return getHTTPContent(url)
77 content = sys.stdin.read()
81 try: content = open(os.path.abspath(url),'r').read()
82 except (IOError, OSError), e:
83 sys.stderr.write('%s\n'%e)
87 # If we've survived, use python's generic URL opening library to handle it
90 res = urllib2.urlopen(url)
93 except (urllib2.URLError, ValueError), e:
94 sys.stderr.write('%s\n'%e)
99 def getHTTPContent(url='',cache='.httplib2-cache'):
100 '''This function attempts to play nice when retrieving content from HTTP
101 services. It's what you should use in a CGI script. It will (by default)
102 slurp the first 20 bytes of the file and check that we are indeed looking
103 at an ICS file before going for broke.'''
110 if not url: return ''
112 if 'httplib2' in sys.modules:
113 try: h = httplib2.Http('.httplib2-cache')
114 except OSError: h = httplib2.Http()
118 if h: content = h.request(url)[1]
120 except ValueError, e:
121 sys.stderr.write('%s\n'%e)
125 content = urllib2.urlopen(url).read()
127 except urllib2.URLError, e:
128 sys.stderr.write('%s\n'%e)
133 if __name__ == '__main__':
134 from optparse import OptionParser
135 # If the user passed us a 'stdin' argument, we'll go with that,
136 # otherwise we'll try for a url opener
138 parser = OptionParser('usage: %prog [options] url')
139 parser.add_option('-s', '--stdin', action='store_true', dest='stdin',
140 default=False, help='Take a calendar from standard input')
141 parser.add_option('-o', '--output', dest='outfile', default='',
142 help='Specify output file (defaults to standard output)')
144 (options, args) = parser.parse_args()
146 if not args and not options.stdin:
149 elif not options.stdin:
154 content = getContent(url, options.stdin)
155 cal = lineJoiner(content)