Disable Outlook Rules for Facebook

[frenchie/icalparse.git] / icalparse.py

diff --git a/icalparse.py b/icalparse.py
index f00b400..1d62a70 100755 (executable)
--- a/icalparse.py
+++ b/icalparse.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python
 #
-# Copyright (c) 2011 James French <[email protected]>
+# Copyright (c) 2013 James French <[email protected]>
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the "Software"), to deal
@@ -20,13 +20,11 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 # THE SOFTWARE.
 
-import sys
-import urlparse
-import os
+import sys, os
+import urlparse 
 import vobject
 from cgi import parse_header
 
-
 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).
@@ -116,13 +114,16 @@ def getHTTPContent(url='',cache='.httplib2-cache'):
        return (content, encoding)
 
 
-def generateRules():
+def generateRules(ruleConfig):
        '''Attempts to load a series of rules into a list'''
        try:
                import parserrules
        except ImportError:
                return []
 
+       for conf in ruleConfig:
+               parserrules.ruleConfig[conf] = ruleConfig[conf]
+
        rules = [getattr(parserrules, rule) for rule in dir(parserrules) if callable(getattr(parserrules, rule))]
        return rules
 
@@ -135,6 +136,7 @@ def applyRules(cal, rules=[], verbose=False):
 
        return cal
 
+
 def writeOutput(cal, outfile=''):
        '''Takes a list of lines and outputs to the specified file'''
 
@@ -156,10 +158,11 @@ def writeOutput(cal, outfile=''):
        if not out == sys.stdout:
                out.close()
 
-if __name__ == '__main__':
+
+def runLocal():
+       '''Main run function if this script is called locally'''
+
        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',
@@ -171,9 +174,14 @@ if __name__ == '__main__':
        parser.add_option('-m','--encoding', dest='encoding', default='',
                help='Specify a different character encoding'
                '(ignored if the remote server also specifies one)')
+       parser.add_option('-t','--timezone', dest='timezone', default='',
+               help='Specify a timezone to use if the remote calendar doesn\'t set it properly')
 
        (options, args) = parser.parse_args()
+       ruleConfig["defaultTZ"] = options.timezone or ruleConfig["defaultTZ"]
 
+       # If the user passed us a 'stdin' argument, we'll go with that,
+       # otherwise we'll try for a url opener
        if not args and not options.stdin:
                parser.print_usage()
                sys.exit(0)
@@ -186,6 +194,73 @@ if __name__ == '__main__':
        encoding = encoding or options.encoding or 'utf-8'
 
        cal = vobject.readOne(unicode(content, encoding))
-       cal = applyRules(cal, generateRules(), options.verbose)
+       cal = applyRules(cal, generateRules(ruleConfig), options.verbose)
 
        writeOutput(cal, options.outfile)
+
+
+def exitQuiet(exitstate=0):
+    '''When called as a CGI script, exit quietly if theres any errors'''
+    print('Content-Type: text/html\n')
+    sys.exit(exitstate)
+
+
+def runCGI():
+    '''Main run function if this script is called as a CGI script
+    to process facebook ical files'''
+    import cgi
+    import re
+    import cgitb; cgitb.enable()
+    
+    ruleConfig["facebook"] = True
+
+    form = cgi.FieldStorage()
+    if "uid" not in form or "key" not in form:
+        print('Content-Type: text/calendar\n')
+        sys.exit(0)
+    try:
+        # UID should be numeric, if it's not we have someone playing games
+        uid = int(form['uid'].value)
+    except:
+        exitQuiet()
+
+    # The user's key will be a 16 character string
+    key = form['key'].value
+    re.search('[&?]+', key) and exitQuiet()
+    len(key) == 16 or exitQuiet()
+    
+    # Historically facebook has been notoriously bad at setting timzeones
+    # in their stuff so this should be a user setting. If it is set in
+    # their calendar it'll  be used otherwise if the user feeds crap or
+    # nothing just assume they want Australia/Perth
+    tz = ""
+    if "tz" in form:
+        from pytz import timezone
+        try:
+            timezone(form['tz'].value)
+            tz = form['tz'].value
+        except: pass
+    
+    ruleConfig["defaultTZ"] = tz or ruleConfig["defaultTZ"]
+                
+    # Okay, we're happy that the input is sane, lets serve up some data
+    url = 'http://www.facebook.com/ical/u.php?uid=%d&key=%s'%(uid,key)
+    (content, encoding) = getHTTPContent(url)
+
+    cal = vobject.readOne(unicode(content, encoding))
+    cal = applyRules(cal, generateRules(ruleConfig), False)
+
+    print('Content-Type: text/calendar; charset=%s\n'%encoding)
+    writeOutput(cal)
+    
+
+if __name__ == '__main__':
+       # Ensure the rules process using the desired timezone
+       ruleConfig = {}
+       ruleConfig["defaultTZ"] = 'Australia/Perth'
+
+       # Detect if this script has been called by CGI and proceed accordingly
+       if 'REQUEST_METHOD' in os.environ:
+               runCGI()
+       else:
+               runLocal()