#!/usr/bin/python
#
-#
+#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
-#
+#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
-#
+#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# THE SOFTWARE.
import sys
-import re
+import urlparse
+import os
-try:
- import httplib2
- urllib = False
-except ImportError:
- try:
- import urllib
- urllib = True
- except:
- sys.stderr.write('Failed to find a suitable http downloader\n')
- raise
class InvalidICS(Exception): pass
class notJoined(Exception): pass
+class IncompleteICS(InvalidICS): pass
+
-# RFC5545 and RFC5546 iCalendar registries contain upper case letters
-# and dashes only and are separated from the value by a colon (:)
-itemstart = re.compile('^[A-Z\-]+:.*')
def lineJoiner(oldcal):
- '''Unfolds a calendar so that items can be parsed'''
-
- cal = []
-
- # Strip newlines (
- for line in oldcal:
- line = line.rstrip('\r\n')
-
- # Reassemble broken Lines
- if not line:
- if not cal: continue
- else: cal[-1] += '\\n'
- elif line[0] == ' ':
- if not cal: raise InvalidICS, 'First line of ICS must be element'
- line = line[1:len(line)]
- cal[-1] += line
- elif not itemstart.match(line):
- if not cal: raise InvalidICS, 'First line of ICS must be element'
- cal[-1] += '\\n' + line
- else:
- if cal: cal[-1] += '\r\n'
- cal.append(line)
+ '''Takes a string containing a calendar and returns an array of its lines'''
- cal[-1] += '\r\n'
+ if not oldcal[0:15] == 'BEGIN:VCALENDAR':
+ raise InvalidICS, "Does not appear to be a valid ICS file"
- return cal
+ if not 'END:VCALENDAR' in oldcal[-15:-1]:
+ raise IncompleteICS, "File appears to be incomplete"
+
+ if list(oldcal) == oldcal:
+ oldcal = '\r\n'.join(oldcal)
+
+ oldcal = oldcal.replace('\r\n ', '').replace('\r\n\t','')
+ return oldcal.strip().split('\r\n')
-def lineSplitter(oldcal, length=75):
+
+def lineFolder(oldcal, length=75):
'''Folds content lines to a specified length, returns a list'''
+ if length > 75:
+ sys.stderr.write('WARN: lines > 75 octets are not RFC compliant\n')
+
cal = []
sl = length - 1
for line in oldcal:
- # Line & line ending line ending fit inside length, do nothing
+ # Line fits inside length, do nothing
if len(line.rstrip()) <= length:
cal.append(line)
else:
cal += brokenline
return cal
+
+
+def splitFields(cal):
+ '''Takes a list of lines in a calendar file and returns a list of key, value pairs'''
+
+ ical = [tuple(x.split(':',1)) for x in cal]
+
+ # Check that we got 2 items on every line
+ for line in ical:
+ if not len(line) == 2:
+ raise InvalidICS, "Didn't find a content key on: %s"%(line)
+
+ return ical
+
+
+def getContent(url='',stdin=False):
+ '''Generic content retriever, DO NOT use this function in a CGI script as
+ it can read from the local disk (which you probably don't want it to).
+ '''
+
+ # Special case, if this is a HTTP url, return the data from it using
+ # the HTTP functions which attempt to play a bit nicer.
+ parsedURL = urlparse.urlparse(url)
+ if 'http' in parsedURL[0]: return getHTTPContent(url)
+
+ if stdin:
+ content = sys.stdin.read()
+ return content
+
+ if not parsedURL[0]:
+ try: content = open(os.path.abspath(url),'r').read()
+ except (IOError, OSError), e:
+ sys.stderr.write('%s\n'%e)
+ sys.exit(1)
+ return content
+
+ # If we've survived, use python's generic URL opening library to handle it
+ import urllib2
+ try:
+ res = urllib2.urlopen(url)
+ content = res.read()
+ res.close()
+ except (urllib2.URLError, OSError), e:
+ sys.stderr.write('%s\n'%e)
+ sys.exit(1)
+ return content
+
+
+def getHTTPContent(url='',cache='.httplib2-cache'):
+ '''This function attempts to play nice when retrieving content from HTTP
+ services. It's what you should use in a CGI script. It will (by default)
+ slurp the first 20 bytes of the file and check that we are indeed looking
+ at an ICS file before going for broke.'''
+
+ try:
+ import httplib2
+ except ImportError:
+ import urllib2
+
+ if not url: return ''
+
+ if 'httplib2' in sys.modules:
+ try: h = httplib2.Http('.httplib2-cache')
+ except OSError: h = httplib2.Http()
+ else: h = False
+
+ try:
+ if h: content = h.request(url)[1]
+ return content
+ except ValueError, e:
+ sys.stderr.write('%s\n'%e)
+ sys.exit(1)
+
+ try:
+ content = urllib2.urlopen(url).read()
+ return content
+ except (urllib2.URLError, OSError), e:
+ sys.stderr.write('%s\n'%e)
+ sys.exit(1)
+
+ return ''
+
+
+def generateRules():
+ '''Attempts to load a series of rules into a list'''
+ try:
+ import parserrules
+ except ImportError:
+ return []
+
+ rules = [getattr(parserrules, rule) for rule in dir(parserrules) if callable(getattr(parserrules, rule))]
+ return rules
+
+
+if __name__ == '__main__':
+ from optparse import OptionParser
+ # If the user passed us a 'stdin' argument, we'll go with that,
+ # otherwise we'll try for a url opener
+
+ parser = OptionParser('usage: %prog [options] url')
+ parser.add_option('-s', '--stdin', action='store_true', dest='stdin',
+ default=False, help='Take a calendar from standard input')
+ parser.add_option('-o', '--output', dest='outfile', default='',
+ help='Specify output file (defaults to standard output)')
+
+ (options, args) = parser.parse_args()
+
+ if not args and not options.stdin:
+ parser.print_usage()
+ sys.exit(0)
+ elif not options.stdin:
+ url = args[0]
+ else:
+ url = ''
+
+ content = getContent(url, options.stdin)
+ cal = lineJoiner(content)
+ ical = splitFields(cal)
+ rules = generateRules()
+ print rules
git.ucc.asn.au / frenchie / icalparse.git / blobdiff
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