lib,test: replace connection query() method with sync_exec{,_params}.

[mailshears.git] / lib / rm / plugins / agendav.rb

diff --git a/lib/rm/plugins/agendav.rb b/lib/rm/plugins/agendav.rb
index 4cd179c655323070d71b01348a975a4a214047c0..2c7709011ca3a421ced83d7d58e2f1aa3c6c2faf 100644 (file)
--- a/lib/rm/plugins/agendav.rb
+++ b/lib/rm/plugins/agendav.rb
@@ -3,43 +3,56 @@ require 'pg'
 require 'common/agendav_plugin'
 require 'rm/rm_plugin'
 
+
+# Handle the removal of Agendav users from its database. Agendav has
+# no concept of domains.
+#
 class AgendavRm
 
   include AgendavPlugin
   include RmPlugin
 
 
-  def delete_domain(domain)
-    # AgenDAV doesn't have a concept of domains.
-  end
-
-  def delete_account(account)
-    # Delete the given username and any records in other tables
-    # belonging to it.
-
+  # 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)
     sql_queries = ['DELETE FROM prefs WHERE username = $1;']
-    sql_queries << 'DELETE FROM shared WHERE user_from = $1;'
 
+    # 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
-      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, [account])
+        connection.sync_exec_params(sql_query, [user.to_s()])
       end
-
+    ensure
+      # Make sure the connection gets closed even if a query explodes.
       connection.close()
-
-    rescue PGError => e
-      # Pretend like we're database-agnostic in case we ever are.
-      raise DatabaseError.new(e)
     end
-
   end
 
 end