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
28 class InvalidICS(Exception): pass
29 class notJoined(Exception): pass
30 class IncompleteICS(InvalidICS): pass
33 def lineJoiner(oldcal):
34 '''Takes a string containing a calendar and returns an array of its lines'''
36 if not oldcal[0:15] == 'BEGIN:VCALENDAR':
37 raise InvalidICS, "Does not appear to be a valid ICS file"
39 if not 'END:VCALENDAR' in oldcal[-15:-1]:
40 raise IncompleteICS, "File appears to be incomplete"
42 if list(oldcal) == oldcal:
43 oldcal = '\r\n'.join(oldcal)
45 oldcal = oldcal.replace('\r\n ', '').replace('\r\n\t','')
46 return oldcal.strip().split('\r\n')
49 def lineFolder(oldcal, length=75):
50 '''Folds content lines to a specified length, returns a list'''
53 sys.stderr.write('WARN: lines > 75 octets are not RFC compliant\n')
59 # Line fits inside length, do nothing
60 if len(line.rstrip()) <= length:
63 brokenline = [line[0:length] + '\r\n']
65 while ll < len(line.rstrip('\r\n')) + 1:
66 brokenline.append(' ' + line[ll:sl+ll].rstrip('\r\n') + '\r\n')
74 '''Takes a list of lines in a calendar file and returns a list of key, value pairs'''
76 ical = [tuple(x.split(':',1)) for x in cal]
78 # Check that we got 2 items on every line
80 if not len(line) == 2:
81 raise InvalidICS, "Didn't find a content key on: %s"%(line)
86 def getContent(url='',stdin=False):
87 '''Generic content retriever, DO NOT use this function in a CGI script as
88 it can read from the local disk (which you probably don't want it to).
91 # Special case, if this is a HTTP url, return the data from it using
92 # the HTTP functions which attempt to play a bit nicer.
93 parsedURL = urlparse.urlparse(url)
94 if 'http' in parsedURL[0]: return getHTTPContent(url)
97 content = sys.stdin.read()
101 try: content = open(os.path.abspath(url),'r').read()
102 except (IOError, OSError), e:
103 sys.stderr.write('%s\n'%e)
107 # If we've survived, use python's generic URL opening library to handle it
110 res = urllib2.urlopen(url)
113 except (urllib2.URLError, OSError), e:
114 sys.stderr.write('%s\n'%e)
119 def getHTTPContent(url='',cache='.httplib2-cache'):
120 '''This function attempts to play nice when retrieving content from HTTP
121 services. It's what you should use in a CGI script. It will (by default)
122 slurp the first 20 bytes of the file and check that we are indeed looking
123 at an ICS file before going for broke.'''
130 if not url: return ''
132 if 'httplib2' in sys.modules:
133 try: h = httplib2.Http('.httplib2-cache')
134 except OSError: h = httplib2.Http()
138 if h: content = h.request(url)[1]
140 except ValueError, e:
141 sys.stderr.write('%s\n'%e)
145 content = urllib2.urlopen(url).read()
147 except (urllib2.URLError, OSError), e:
148 sys.stderr.write('%s\n'%e)
155 '''Attempts to load a series of rules into a list'''
161 rules = [getattr(parserrules, rule) for rule in dir(parserrules) if callable(getattr(parserrules, rule))]
165 if __name__ == '__main__':
166 from optparse import OptionParser
167 # If the user passed us a 'stdin' argument, we'll go with that,
168 # otherwise we'll try for a url opener
170 parser = OptionParser('usage: %prog [options] url')
171 parser.add_option('-s', '--stdin', action='store_true', dest='stdin',
172 default=False, help='Take a calendar from standard input')
173 parser.add_option('-o', '--output', dest='outfile', default='',
174 help='Specify output file (defaults to standard output)')
176 (options, args) = parser.parse_args()
178 if not args and not options.stdin:
181 elif not options.stdin:
186 content = getContent(url, options.stdin)
187 cal = lineJoiner(content)
188 ical = splitFields(cal)
189 rules = generateRules()