X-Git-Url: http://gitweb.michael.orlitzky.com/?p=mailshears.git;a=blobdiff_plain;f=lib%2Frm%2Fplugins%2Fagendav.rb;h=2c7709011ca3a421ced83d7d58e2f1aa3c6c2faf;hp=28f1eb4167a4a63bec61889ea47b97492d87f80f;hb=fa7782720ff15fce29b6f875678e9fd0c197485a;hpb=df4e02ebf6a4e28a58abcb298a4442a245ad0b15

diff --git a/lib/rm/plugins/agendav.rb b/lib/rm/plugins/agendav.rb
index 28f1eb4..2c77090 100644
--- a/lib/rm/plugins/agendav.rb
+++ b/lib/rm/plugins/agendav.rb
@@ -16,22 +16,43 @@ class AgendavRm
   # Remove *user* from the Agendav database. This should remove him
   # from _every_ table in which he is referenced.
   #
+  # We do not raise an error if the user doesn't exist. This is due to
+  # an unfortunate problem with the "user exists" check in AgenDAV.
+  # The AgenDAV "shares" table is not tied directly to a username, so
+  # we are forced to use a regexp match to decide what rows to delete
+  # from that table. We do so regardless of whether or not the username
+  # exists in the "prefs" table, because that table stores only non-
+  # default preferences -- not all users' preferences.
+  #
   # @param user [User] the user to remove.
   #
   def remove_user(user)
-    raise NonexistentUserError.new(user.to_s()) if not user_exists(user)
-
     sql_queries = ['DELETE FROM prefs WHERE username = $1;']
-    sql_queries << 'DELETE FROM shared WHERE user_from = $1;'
 
-    connection = PGconn.connect(@db_host, @db_port, @db_opts, @db_tty,
-                                @db_name, @db_user, @db_pass)
-
-    sql_queries.each do |sql_query|
-      connection.query(sql_query, [user.to_s()])
+    # The "shares" table contains principal URLs, and the "@" symbol
+    # is usually encoded to "%40". These queries do a regex match on
+    # the username after replacing the "%40" with a "@".
+    #
+    # As a precaution, I haven chosen not to delete based on the
+    # "calendar" field here. Nobody should have a calendar named
+    # "user%40example.com", but it's not impossible -- and we don't
+    # want to delete that calendar when the not-necessarily-related
+    # "user@example.com" account is removed. And the usual appearance
+    # of the user's email address in the "calendar" field happens when
+    # he is also the owner, so the calendar does get deleted in the
+    # normal situation.
+    sql_queries << "DELETE FROM shares WHERE REPLACE(owner,'%40','@')    ~ $1;"
+    sql_queries << "DELETE FROM shares WHERE REPLACE(\"with\",'%40','@') ~ $1;"
+
+    connection = PG::Connection.new(@db_hash)
+    begin
+      sql_queries.each do |sql_query|
+        connection.sync_exec_params(sql_query, [user.to_s()])
+      end
+    ensure
+      # Make sure the connection gets closed even if a query explodes.
+      connection.close()
     end
-
-    connection.close()
   end
 
 end