1 #!/usr/bin/env python 2 3 import cgi, os, sys 4 5 sys.path.append("/var/lib/imip-agent") 6 7 from imiptools import make_message, sendmail 8 from imiptools.content import Handler, \ 9 format_datetime, get_address, get_datetime, \ 10 get_item, get_uri, get_utc_datetime, get_values, \ 11 parse_object, to_part, to_timezone 12 from imiptools.period import have_conflict 13 from vCalendar import to_node 14 import markup 15 import imip_store 16 17 getenv = os.environ.get 18 setenv = os.environ.__setitem__ 19 20 class CGIEnvironment: 21 22 "A CGI-compatible environment." 23 24 def __init__(self): 25 self.args = None 26 self.method = None 27 self.path = None 28 self.path_info = None 29 self.user = None 30 31 def get_args(self): 32 if self.args is None: 33 if self.get_method() != "POST": 34 setenv("QUERY_STRING", "") 35 self.args = cgi.parse(keep_blank_values=True) 36 return self.args 37 38 def get_method(self): 39 if self.method is None: 40 self.method = getenv("REQUEST_METHOD") or "GET" 41 return self.method 42 43 def get_path(self): 44 if self.path is None: 45 self.path = getenv("SCRIPT_NAME") or "" 46 return self.path 47 48 def get_path_info(self): 49 if self.path_info is None: 50 self.path_info = getenv("PATH_INFO") or "" 51 return self.path_info 52 53 def get_user(self): 54 if self.user is None: 55 self.user = getenv("REMOTE_USER") or "" 56 return self.user 57 58 def get_output(self): 59 return sys.stdout 60 61 def get_url(self): 62 path = self.get_path() 63 path_info = self.get_path_info() 64 return "%s%s" % (path.rstrip("/"), path_info) 65 66 class ManagerHandler(Handler): 67 68 "A content handler for use by the manager." 69 70 def __init__(self, details, objtype, user): 71 Handler.__init__(self, details) 72 self.objtype = objtype 73 self.user = user 74 self.organisers = map(get_address, self.get_values("ORGANIZER")) 75 76 # Communication methods. 77 78 def send_message(self, sender): 79 80 """ 81 Create a full calendar object and send it to the organisers from the 82 given 'sender'. 83 """ 84 85 # NOTE: Should parameterise the subject and body text. 86 87 node = to_node({self.objtype : [(self.details, {})]}) 88 part = to_part("REPLY", [node]) 89 message = make_message([part], self.organisers, sender, "Response to request", "Response to a calendar request") 90 sendmail(sender, self.organisers, message.as_string()) 91 92 # Action methods. 93 94 def process_request(self, accept): 95 96 """ 97 Process the current request for the given 'user', accepting any request 98 when 'accept' is true, declining requests otherwise. Return whether any 99 action was taken. 100 """ 101 102 # When accepting or declining, do so only on behalf of this user, 103 # preserving any other attributes set as an attendee. 104 105 for attendee, attendee_attr in self.get_items("ATTENDEE"): 106 107 if attendee == self.user: 108 freebusy = self.store.get_freebusy(attendee) 109 110 attendee_attr["PARTSTAT"] = accept and "ACCEPTED" or "DECLINED" 111 self.details["ATTENDEE"] = [(attendee, attendee_attr)] 112 self.send_message(get_address(attendee)) 113 114 # Update the free/busy information. 115 116 if accept: 117 periods = self.get_periods() 118 self.update_freebusy(freebusy, attendee, periods) 119 120 if self.publisher: 121 self.publisher.set_freebusy(attendee, freebusy) 122 123 return True 124 125 return False 126 127 class Manager: 128 129 "A simple manager application." 130 131 def __init__(self): 132 self.env = CGIEnvironment() 133 user = self.env.get_user() 134 self.user = user and get_uri(user) or None 135 self.out = self.env.get_output() 136 self.page = markup.page() 137 self.encoding = "utf-8" 138 139 self.store = imip_store.FileStore() 140 141 try: 142 self.publisher = imip_store.FilePublisher() 143 except OSError: 144 self.publisher = None 145 146 # Data management methods. 147 148 def remove_request(self, uid): 149 requests = self.store.get_requests(self.user) 150 if uid in requests: 151 requests.remove(uid) 152 self.store.set_requests(self.user, requests) 153 154 # Presentation methods. 155 156 def new_page(self, title): 157 self.page.init(title=title, charset=self.encoding) 158 159 def status(self, code, message): 160 print >>self.out, "Status:", code, message 161 162 def no_user(self): 163 self.status(403, "Forbidden") 164 self.new_page(title="Forbidden") 165 self.page.p("You are not logged in and thus cannot access scheduling requests.") 166 167 def no_page(self): 168 self.status(404, "Not Found") 169 self.new_page(title="Not Found") 170 self.page.p("No page is provided at the given address.") 171 172 def show_requests(self): 173 174 "Show requests for the current user." 175 176 # NOTE: This list could be more informative, but it is envisaged that 177 # NOTE: the requests would be visited directly anyway. 178 179 self.new_page(title="Pending Requests") 180 181 requests = self.store.get_requests(self.user) 182 183 if requests: 184 self.page.ul() 185 186 for request in requests: 187 self.page.li() 188 self.page.a(request, href="%s/%s" % (self.env.get_url().rstrip("/"), request)) 189 self.page.li.close() 190 191 self.page.ul.close() 192 193 else: 194 self.page.p("There are no pending requests.") 195 196 def show_request(self, path_info): 197 198 "Show a request using the given 'path_info' for the current user." 199 200 uid = path_info.lstrip("/").split("/", 1)[0] 201 f = uid and self.store.get_event(self.user, uid) or None 202 203 if not f: 204 return False 205 206 request = parse_object(f, "utf-8") 207 208 if not request: 209 return False 210 211 objtype = request.keys()[0] 212 request = request[objtype][0] 213 214 # Handle a submitted form. 215 216 args = self.env.get_args() 217 show_form = False 218 219 accept = args.has_key("accept") 220 decline = args.has_key("decline") 221 222 if accept or decline: 223 224 handler = ManagerHandler(request, objtype, self.user) 225 226 if handler.process_request(accept): 227 228 # Remove the request from the list. 229 230 self.remove_request(uid) 231 232 elif args.has_key("ignore"): 233 234 # Remove the request from the list. 235 236 self.remove_request(uid) 237 238 else: 239 show_form = True 240 241 self.new_page(title="Request") 242 243 # Provide a summary of the request. 244 245 self.page.p("The following request was received:") 246 self.page.dl() 247 248 for name in ["SUMMARY", "DTSTART", "DTEND", "ORGANIZER", "ATTENDEE"]: 249 for value in get_values(request, name): 250 self.page.dt(name) 251 self.page.dd(value) 252 253 self.page.dl.close() 254 255 dtstart = format_datetime(get_utc_datetime(request, "DTSTART")) 256 dtend = format_datetime(get_utc_datetime(request, "DTEND")) 257 258 # Indicate whether there are conflicting events. 259 260 freebusy = self.store.get_freebusy(self.user) 261 262 if freebusy: 263 264 # Obtain any time zone details from the suggested event. 265 266 _dtstart, attr = get_item(request, "DTSTART") 267 tzid = attr.get("TZID") 268 269 # Show any conflicts. 270 271 for start, end, found_uid in have_conflict(freebusy, [(dtstart, dtend)], True): 272 if uid != found_uid: 273 start = format_datetime(to_timezone(get_datetime(start), tzid)) 274 end = format_datetime(to_timezone(get_datetime(end), tzid)) 275 self.page.p("Event conflicts with another from %s to %s." % (start, end)) 276 277 # Show a form if no action has just been taken. 278 279 if show_form: 280 self.page.p("Action to take for this request:") 281 self.page.form(method="POST") 282 self.page.p() 283 self.page.input(name="accept", type="submit", value="Accept") 284 self.page.add(" ") 285 self.page.input(name="decline", type="submit", value="Decline") 286 self.page.add(" ") 287 self.page.input(name="ignore", type="submit", value="Ignore") 288 self.page.p.close() 289 self.page.form.close() 290 291 return True 292 293 def select_action(self): 294 295 "Select the desired action and show the result." 296 297 path_info = self.env.get_path_info().rstrip("/") 298 if not path_info: 299 self.show_requests() 300 elif self.show_request(path_info): 301 pass 302 else: 303 self.no_page() 304 305 def show(self): 306 307 "Interpret a request and show an appropriate response." 308 309 if not self.user: 310 self.no_user() 311 else: 312 self.select_action() 313 314 # Write the headers and actual content. 315 316 print >>self.out, "Content-Type: text/html; charset=%s" % self.encoding 317 print >>self.out 318 self.out.write(unicode(self.page).encode(self.encoding)) 319 320 if __name__ == "__main__": 321 Manager().show() 322 323 # vim: tabstop=4 expandtab shiftwidth=4