davical/dba/davical.sql

-- Really Simple CalDAV Store - Database Schema
--

-- Something that can look like a filesystem hierarchy where we store stuff
CREATE TABLE collection (
  user_no INT references usr(user_no) ON UPDATE CASCADE ON DELETE CASCADE DEFERRABLE,
  parent_container TEXT,
  dav_name TEXT,
  dav_etag TEXT,
  dav_displayname TEXT,
  is_calendar BOOLEAN,
  created TIMESTAMP WITH TIME ZONE,
  modified TIMESTAMP WITH TIME ZONE,
  public_events_only BOOLEAN NOT NULL DEFAULT FALSE,
  publicly_readable BOOLEAN NOT NULL DEFAULT FALSE,

  PRIMARY KEY ( user_no, dav_name )
);


-- The main event.  Where we store the things the calendar throws at us.
CREATE TABLE caldav_data (
  user_no INT references usr(user_no) ON UPDATE CASCADE ON DELETE CASCADE DEFERRABLE,
  dav_name TEXT,
  dav_etag TEXT,
  created TIMESTAMP WITH TIME ZONE,
  modified TIMESTAMP WITH TIME ZONE,
  caldav_data TEXT,
  caldav_type TEXT,
  logged_user INT references usr(user_no),
  dav_id SERIAL UNIQUE,

  PRIMARY KEY ( user_no, dav_name )
);


-- Not particularly needed, perhaps, except as a way to collect
-- a bunch of valid iCalendar time zone specifications... :-)
CREATE TABLE time_zone (
  tz_id TEXT PRIMARY KEY,
  tz_locn TEXT,
  tz_spec TEXT
);


-- The parsed calendar item.  Here we have pulled those events/todos/journals apart somewhat.
CREATE TABLE calendar_item (
  user_no INT references usr(user_no),
  dav_name TEXT,
  dav_etag TEXT,

  -- Extracted vEvent/vTodo data
  uid TEXT,
  created TIMESTAMP,
  last_modified TIMESTAMP,
  dtstamp TIMESTAMP,
  dtstart TIMESTAMP WITH TIME ZONE,
  dtend TIMESTAMP WITH TIME ZONE,
  due TIMESTAMP WITH TIME ZONE,
  summary TEXT,
  location TEXT,
  description TEXT,
  priority INT,
  class TEXT,
  transp TEXT,
  rrule TEXT,
  url TEXT,
  percent_complete NUMERIC(7,2),
  tz_id TEXT REFERENCES time_zone( tz_id ),
  status TEXT,
  dav_id INT8 UNIQUE,

  -- Cascade updates / deletes from the caldav_data table
  CONSTRAINT caldav_exists FOREIGN KEY ( user_no, dav_name )
                REFERENCES caldav_data ( user_no, dav_name )
                MATCH FULL ON DELETE CASCADE ON UPDATE CASCADE DEFERRABLE,

  PRIMARY KEY ( user_no, dav_name )
);


-- Each user can be related to each other user.  This mechanism can also
-- be used to define groups of users, since some relationships are transitive.
CREATE TABLE relationship_type (
  rt_id SERIAL PRIMARY KEY,
  rt_name TEXT,
  rt_togroup BOOLEAN,
  confers TEXT DEFAULT 'RW',
  rt_fromgroup BOOLEAN
);


CREATE TABLE relationship (
  from_user INT REFERENCES usr (user_no) ON UPDATE CASCADE,
  to_user INT REFERENCES usr (user_no) ON UPDATE CASCADE,
  rt_id INT REFERENCES relationship_type (rt_id) ON UPDATE CASCADE,

  PRIMARY KEY ( from_user, to_user, rt_id )
);


CREATE TABLE locks (
  dav_name TEXT,
  opaquelocktoken TEXT UNIQUE NOT NULL,
  type TEXT,
  scope TEXT,
  depth INT,
  owner TEXT,
  timeout INTERVAL,
  start TIMESTAMP DEFAULT current_timestamp
);
CREATE INDEX locks_dav_name_idx ON locks(dav_name);


CREATE TABLE property (
  dav_name TEXT,
  property_name TEXT,
  property_value TEXT,
  changed_on TIMESTAMP DEFAULT current_timestamp,
  changed_by INT REFERENCES usr ( user_no ),
  PRIMARY KEY ( dav_name, property_name )
);
CREATE INDEX properties_dav_name_idx ON property(dav_name);


CREATE TABLE freebusy_ticket (
  ticket_id TEXT NOT NULL PRIMARY KEY,
  user_no integer NOT NULL REFERENCES usr(user_no) ON UPDATE CASCADE ON DELETE CASCADE,
  created timestamp with time zone DEFAULT current_timestamp NOT NULL
);


CREATE or REPLACE FUNCTION sync_dav_id ( ) RETURNS TRIGGER AS '
  DECLARE
  BEGIN

    IF TG_OP = ''DELETE'' THEN
      -- Just let the ON DELETE CASCADE handle this case
      RETURN OLD;
    END IF;

    IF NEW.dav_id IS NULL THEN
      NEW.dav_id = nextval(''caldav_data_dav_id_seq'');
    END IF;

    IF TG_OP = ''UPDATE'' THEN
      IF OLD.dav_id = NEW.dav_id THEN
        -- Nothing to do
        RETURN NEW;
      END IF;
    END IF;

    IF TG_RELNAME = ''caldav_data'' THEN
      UPDATE calendar_item SET dav_id = NEW.dav_id WHERE user_no = NEW.user_no AND dav_name = NEW.dav_name;
    ELSE
      UPDATE caldav_data SET dav_id = NEW.dav_id WHERE user_no = NEW.user_no AND dav_name = NEW.dav_name;
    END IF;

    RETURN NEW;

  END
' LANGUAGE 'plpgsql';

CREATE TRIGGER caldav_data_sync_dav_id AFTER INSERT OR UPDATE ON caldav_data
    FOR EACH ROW EXECUTE PROCEDURE sync_dav_id();

CREATE TRIGGER calendar_item_sync_dav_id AFTER INSERT OR UPDATE ON calendar_item
    FOR EACH ROW EXECUTE PROCEDURE sync_dav_id();


SELECT new_db_revision(1,1,12, 'December' );