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davical/dba/caldav_functions.sql
Andrew McMillan 4e12eb82e4 Update sync-collection REPORT to match -04 of draft.
2010-11-30 12:31:25 +13:00

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/**
* PostgreSQL Functions for CalDAV handling
*
* @package rscds
* @subpackage database
* @author Andrew McMillan <andrew@catalyst.net.nz>
* @copyright Catalyst IT Ltd
* @license http://gnu.org/copyleft/gpl.html GNU GPL v2
*/
CREATE or REPLACE FUNCTION apply_month_byday( TIMESTAMP WITH TIME ZONE, TEXT ) RETURNS TIMESTAMP WITH TIME ZONE AS $$
DECLARE
in_time ALIAS FOR $1;
byday ALIAS FOR $2;
weeks INT;
dow INT;
temp_txt TEXT;
dd INT;
mm INT;
yy INT;
our_dow INT;
our_answer TIMESTAMP WITH TIME ZONE;
BEGIN
dow := position(substring( byday from '..$') in 'SUMOTUWETHFRSA') / 2;
temp_txt := substring(byday from '([0-9]+)');
weeks := temp_txt::int;
-- RAISE NOTICE 'DOW: %, Weeks: %(%s)', dow, weeks, temp_txt;
IF substring(byday for 1) = '-' THEN
-- Last XX of month, or possibly second-to-last, but unlikely
mm := extract( 'month' from in_time);
yy := extract( 'year' from in_time);
-- Start with the last day of the month
our_answer := (yy::text || '-' || (mm+1)::text || '-01')::timestamp - '1 day'::interval;
dd := extract( 'dow' from our_answer);
dd := dd - dow;
IF dd < 0 THEN
dd := dd + 7;
END IF;
-- Having calculated the right day of the month, we now apply that back to in_time
-- which contains the otherwise-unobtainable timezone detail (and the time)
our_answer = our_answer - (dd::text || 'days')::interval;
dd := extract( 'day' from our_answer) - extract( 'day' from in_time);
our_answer := in_time + (dd::text || 'days')::interval;
IF weeks > 1 THEN
weeks := weeks - 1;
our_answer := our_answer - (weeks::text || 'weeks')::interval;
END IF;
ELSE
-- Shift our date to the correct day of week..
our_dow := extract( 'dow' from in_time);
our_dow := our_dow - dow;
dd := extract( 'day' from in_time);
IF our_dow >= dd THEN
our_dow := our_dow - 7;
END IF;
our_answer := in_time - (our_dow::text || 'days')::interval;
dd = extract( 'day' from our_answer);
-- Shift the date to the correct week...
dd := weeks - ((dd+6) / 7);
IF dd != 0 THEN
our_answer := our_answer + ((dd::text || 'weeks')::interval);
END IF;
END IF;
RETURN our_answer;
END;
$$ LANGUAGE 'plpgsql' IMMUTABLE STRICT;
CREATE or REPLACE FUNCTION calculate_later_timestamp( TIMESTAMP WITH TIME ZONE, TIMESTAMP WITH TIME ZONE, TEXT ) RETURNS TIMESTAMP WITH TIME ZONE AS $$
DECLARE
earliest ALIAS FOR $1;
basedate ALIAS FOR $2;
repeatrule ALIAS FOR $3;
frequency TEXT;
temp_txt TEXT;
length INT;
count INT;
byday TEXT;
bymonthday INT;
basediff INTERVAL;
past_repeats INT8;
units TEXT;
dow TEXT;
our_answer TIMESTAMP WITH TIME ZONE;
loopcount INT;
BEGIN
IF basedate > earliest THEN
RETURN basedate;
END IF;
temp_txt := substring(repeatrule from 'UNTIL=([0-9TZ]+)(;|$)');
IF temp_txt IS NOT NULL AND temp_txt::timestamp with time zone < earliest THEN
RETURN NULL;
END IF;
frequency := substring(repeatrule from 'FREQ=([A-Z]+)(;|$)');
IF frequency IS NULL THEN
RETURN NULL;
END IF;
past_repeats = 0;
length = 1;
temp_txt := substring(repeatrule from 'INTERVAL=([0-9]+)(;|$)');
IF temp_txt IS NOT NULL THEN
length := temp_txt::int;
basediff := earliest - basedate;
-- RAISE NOTICE 'Frequency: %, Length: %(%), Basediff: %', frequency, length, temp_txt, basediff;
-- Calculate the number of past periods between our base date and our earliest date
IF frequency = 'WEEKLY' OR frequency = 'DAILY' THEN
past_repeats := extract('epoch' from basediff)::INT8 / 86400;
-- RAISE NOTICE 'Days: %', past_repeats;
IF frequency = 'WEEKLY' THEN
past_repeats := past_repeats / 7;
END IF;
ELSE
past_repeats = extract( 'years' from basediff );
IF frequency = 'MONTHLY' THEN
past_repeats = (past_repeats *12) + extract( 'months' from basediff );
END IF;
END IF;
IF length IS NOT NULL THEN
past_repeats = (past_repeats / length) + 1;
END IF;
END IF;
-- Check that we have not exceeded the COUNT= limit
temp_txt := substring(repeatrule from 'COUNT=([0-9]+)(;|$)');
IF temp_txt IS NOT NULL THEN
count := temp_txt::int;
-- RAISE NOTICE 'Periods: %, Count: %(%), length: %', past_repeats, count, temp_txt, length;
IF ( count <= past_repeats ) THEN
RETURN NULL;
END IF;
ELSE
count := NULL;
END IF;
temp_txt := substring(repeatrule from 'BYSETPOS=([0-9-]+)(;|$)');
byday := substring(repeatrule from 'BYDAY=([0-9A-Z,]+-)(;|$)');
IF byday IS NOT NULL AND frequency = 'MONTHLY' THEN
-- Since this could move the date around a month we go back one
-- period just to be extra sure.
past_repeats = past_repeats - 1;
IF temp_txt IS NOT NULL THEN
-- Crudely hack the BYSETPOS onto the front of BYDAY. While this
-- is not as per rfc2445, RRULE syntax is so complex and overblown
-- that nobody correctly uses comma-separated BYDAY or BYSETPOS, and
-- certainly not within a MONTHLY RRULE.
byday := temp_txt || byday;
END IF;
END IF;
past_repeats = past_repeats * length;
units := CASE
WHEN frequency = 'DAILY' THEN 'days'
WHEN frequency = 'WEEKLY' THEN 'weeks'
WHEN frequency = 'MONTHLY' THEN 'months'
WHEN frequency = 'YEARLY' THEN 'years'
END;
temp_txt := substring(repeatrule from 'BYMONTHDAY=([0-9,]+)(;|$)');
bymonthday := temp_txt::int;
-- With all of the above calculation, this date should be close to (but less than)
-- the target, and we should only loop once or twice.
our_answer := basedate + (past_repeats::text || units)::interval;
IF our_answer IS NULL THEN
RAISE EXCEPTION 'our_answer IS NULL! basedate:% past_repeats:% units:%', basedate, past_repeats, units;
END IF;
loopcount := 500; -- Desirable to stop an infinite loop if there is something we cannot handle
LOOP
-- RAISE NOTICE 'Testing date: %', our_answer;
IF frequency = 'DAILY' THEN
IF byday IS NOT NULL THEN
LOOP
dow = substring( to_char( our_answer, 'DY' ) for 2);
EXIT WHEN byday ~* dow;
-- Increment for our next time through the loop...
our_answer := our_answer + (length::text || units)::interval;
END LOOP;
END IF;
ELSIF frequency = 'WEEKLY' THEN
-- Weekly repeats are only on specific days
-- This is really not right, since a WEEKLY on MO,WE,FR should
-- occur three times each week and this will only be once a week.
dow = substring( to_char( our_answer, 'DY' ) for 2);
ELSIF frequency = 'MONTHLY' THEN
IF byday IS NOT NULL THEN
-- This works fine, except that maybe there are multiple BYDAY
-- components. e.g. 1TU,3TU might be 1st & 3rd tuesdays.
our_answer := apply_month_byday( our_answer, byday );
ELSE
-- If we did not get a BYDAY= then we kind of have to assume it is the same day each month
our_answer := our_answer + '1 month'::interval;
END IF;
ELSIF bymonthday IS NOT NULL AND frequency = 'MONTHLY' AND bymonthday < 1 THEN
-- We do not deal with this situation at present
RAISE NOTICE 'The case of negative BYMONTHDAY is not handled yet.';
END IF;
EXIT WHEN our_answer >= earliest;
-- Give up if we have exceeded the count
IF ( count IS NOT NULL AND past_repeats > count ) THEN
RETURN NULL;
ELSE
past_repeats := past_repeats + 1;
END IF;
loopcount := loopcount - 1;
IF loopcount < 0 THEN
RAISE NOTICE 'Giving up on repeat rule "%" - after 100 increments from % we are still not after %', repeatrule, basedate, earliest;
RETURN NULL;
END IF;
-- Increment for our next time through the loop...
our_answer := our_answer + (length::text || units)::interval;
END LOOP;
RETURN our_answer;
END;
$$ LANGUAGE 'plpgsql' IMMUTABLE STRICT;
CREATE or REPLACE FUNCTION usr_is_role( INT, TEXT ) RETURNS BOOLEAN AS $$
SELECT EXISTS( SELECT 1 FROM role_member JOIN roles USING(role_no) WHERE role_member.user_no=$1 AND roles.role_name=$2 )
$$ LANGUAGE 'sql' IMMUTABLE STRICT;
CREATE or REPLACE FUNCTION legacy_get_permissions( INT, INT ) RETURNS TEXT AS $$
DECLARE
in_from ALIAS FOR $1;
in_to ALIAS FOR $2;
out_confers TEXT;
tmp_confers1 TEXT;
tmp_confers2 TEXT;
tmp_txt TEXT;
dbg TEXT DEFAULT '';
r RECORD;
counter INT;
BEGIN
-- Self can always have full access
IF in_from = in_to THEN
RETURN 'A';
END IF;
-- dbg := 'S-';
SELECT rt1.confers INTO out_confers FROM relationship r1 JOIN relationship_type rt1 USING ( rt_id )
WHERE r1.from_user = in_from AND r1.to_user = in_to AND NOT usr_is_role(r1.to_user,'Group');
IF FOUND THEN
RETURN dbg || out_confers;
END IF;
-- RAISE NOTICE 'No simple relationships between % and %', in_from, in_to;
out_confers := '';
FOR r IN SELECT rt1.confers AS r1, rt2.confers AS r2 FROM relationship r1 JOIN relationship_type rt1 USING(rt_id)
JOIN relationship r2 ON r1.to_user=r2.from_user JOIN relationship_type rt2 ON r2.rt_id=rt2.rt_id
WHERE r1.from_user=in_from AND r2.to_user=in_to
AND EXISTS( SELECT 1 FROM role_member JOIN roles USING(role_no) WHERE role_member.user_no=r1.to_user AND roles.role_name='Group')
AND NOT EXISTS( SELECT 1 FROM role_member JOIN roles USING(role_no) WHERE role_member.user_no=r2.to_user AND roles.role_name='Group')
AND NOT EXISTS( SELECT 1 FROM role_member JOIN roles USING(role_no) WHERE role_member.user_no=r1.from_user AND roles.role_name='Group')
LOOP
-- RAISE NOTICE 'Permissions to group % from group %', r.r1, r.r2;
-- FIXME: This is an oversimplification
-- dbg := 'C-';
tmp_confers1 := r.r1;
tmp_confers2 := r.r2;
IF tmp_confers1 != tmp_confers2 THEN
IF tmp_confers1 ~* 'A' THEN
-- Ensure that A is expanded to all supported privs before being used as a mask
tmp_confers1 := 'AFBRWU';
END IF;
IF tmp_confers2 ~* 'A' THEN
-- Ensure that A is expanded to all supported privs before being used as a mask
tmp_confers2 := 'AFBRWU';
END IF;
-- RAISE NOTICE 'Expanded permissions to group % from group %', tmp_confers1, tmp_confers2;
tmp_txt = '';
FOR counter IN 1 .. length(tmp_confers2) LOOP
IF tmp_confers1 ~* substring(tmp_confers2,counter,1) THEN
tmp_txt := tmp_txt || substring(tmp_confers2,counter,1);
END IF;
END LOOP;
tmp_confers2 := tmp_txt;
END IF;
FOR counter IN 1 .. length(tmp_confers2) LOOP
IF NOT out_confers ~* substring(tmp_confers2,counter,1) THEN
out_confers := out_confers || substring(tmp_confers2,counter,1);
END IF;
END LOOP;
END LOOP;
IF out_confers ~* 'A' OR (out_confers ~* 'B' AND out_confers ~* 'F' AND out_confers ~* 'R' AND out_confers ~* 'W' AND out_confers ~* 'U') THEN
out_confers := 'A';
END IF;
IF out_confers != '' THEN
RETURN dbg || out_confers;
END IF;
-- RAISE NOTICE 'No complex relationships between % and %', in_from, in_to;
SELECT rt1.confers INTO out_confers, tmp_confers1 FROM relationship r1 JOIN relationship_type rt1 ON ( r1.rt_id = rt1.rt_id )
LEFT OUTER JOIN relationship r2 ON ( rt1.rt_id = r2.rt_id )
WHERE r1.from_user = in_from AND r2.from_user = in_to AND r1.from_user != r2.from_user AND r1.to_user = r2.to_user
AND NOT EXISTS( SELECT 1 FROM relationship r3 WHERE r3.from_user = r1.to_user )
AND usr_is_role(r1.to_user,'Group');
IF FOUND THEN
-- dbg := 'H-';
-- RAISE NOTICE 'Permissions to shared group % ', out_confers;
RETURN dbg || out_confers;
END IF;
-- RAISE NOTICE 'No common group relationships between % and %', in_from, in_to;
RETURN '';
END;
$$ LANGUAGE 'plpgsql' IMMUTABLE STRICT;
-- Function to convert a PostgreSQL date into UTC + the format used by iCalendar
CREATE or REPLACE FUNCTION to_ical_utc( TIMESTAMP WITH TIME ZONE ) RETURNS TEXT AS $$
SELECT to_char( $1 at time zone 'UTC', 'YYYYMMDD"T"HH24MISS"Z"' )
$$ LANGUAGE 'sql' IMMUTABLE STRICT;
-- Function to set an arbitrary DAV property
CREATE or REPLACE FUNCTION set_dav_property( TEXT, INTEGER, TEXT, TEXT ) RETURNS BOOLEAN AS $$
DECLARE
path ALIAS FOR $1;
change_user ALIAS FOR $2;
key ALIAS FOR $3;
value ALIAS FOR $4;
tmp_int INT;
BEGIN
-- Check that there is either a resource, collection or user at this location.
IF NOT EXISTS( SELECT 1 FROM caldav_data WHERE dav_name = path
UNION SELECT 1 FROM collection WHERE dav_name = path
UNION SELECT 1 FROM dav_principal WHERE dav_name = path
UNION SELECT 1 FROM dav_binding WHERE dav_name = path
) THEN
RETURN FALSE;
END IF;
SELECT changed_by INTO tmp_int FROM property WHERE dav_name = path AND property_name = key;
IF FOUND THEN
UPDATE property SET changed_by=change_user, changed_on=current_timestamp, property_value=value WHERE dav_name = path AND property_name = key;
ELSE
INSERT INTO property ( dav_name, changed_by, changed_on, property_name, property_value ) VALUES( path, change_user, current_timestamp, key, value );
END IF;
RETURN TRUE;
END;
$$ LANGUAGE 'plpgsql' STRICT;
-- List a user's relationships as a text string
CREATE or REPLACE FUNCTION relationship_list( INT8 ) RETURNS TEXT AS $$
DECLARE
user ALIAS FOR $1;
r RECORD;
rlist TEXT;
BEGIN
rlist := '';
FOR r IN SELECT rt_name, fullname FROM relationship
LEFT JOIN relationship_type USING(rt_id) LEFT JOIN usr tgt ON to_user = tgt.user_no
WHERE from_user = user
LOOP
rlist := rlist
|| CASE WHEN rlist = '' THEN '' ELSE ', ' END
|| r.rt_name || '(' || r.fullname || ')';
END LOOP;
RETURN rlist;
END;
$$ LANGUAGE 'plpgsql';
DROP FUNCTION rename_davical_user( TEXT, TEXT );
DROP TRIGGER usr_modified ON usr CASCADE;
CREATE or REPLACE FUNCTION usr_modified() RETURNS TRIGGER AS $$
DECLARE
oldpath TEXT;
newpath TEXT;
BEGIN
-- in case we trigger on other events in future
IF TG_OP = 'UPDATE' THEN
IF NEW.username != OLD.username THEN
oldpath := '/' || OLD.username || '/';
newpath := '/' || NEW.username || '/';
UPDATE collection
SET parent_container = replace( parent_container, oldpath, newpath),
dav_name = replace( dav_name, oldpath, newpath)
WHERE substring(dav_name from 1 for char_length(oldpath)) = oldpath;
END IF;
END IF;
RETURN NEW;
END;
$$ LANGUAGE plpgsql;
CREATE TRIGGER usr_modified AFTER UPDATE ON usr
FOR EACH ROW EXECUTE PROCEDURE usr_modified();
DROP TRIGGER collection_modified ON collection CASCADE;
CREATE or REPLACE FUNCTION collection_modified() RETURNS TRIGGER AS $$
DECLARE
BEGIN
-- in case we trigger on other events in future
IF TG_OP = 'UPDATE' THEN
IF NEW.dav_name != OLD.dav_name THEN
UPDATE caldav_data
SET dav_name = replace( dav_name, OLD.dav_name, NEW.dav_name),
user_no = NEW.user_no
WHERE substring(dav_name from 1 for char_length(OLD.dav_name)) = OLD.dav_name;
END IF;
END IF;
RETURN NEW;
END;
$$ LANGUAGE plpgsql;
CREATE TRIGGER collection_modified AFTER UPDATE ON collection
FOR EACH ROW EXECUTE PROCEDURE collection_modified();
DROP TRIGGER caldav_data_modified ON caldav_data CASCADE;
CREATE or REPLACE FUNCTION caldav_data_modified() RETURNS TRIGGER AS $$
DECLARE
coll_id caldav_data.collection_id%TYPE;
BEGIN
IF TG_OP = 'UPDATE' THEN
IF NEW.caldav_data = OLD.caldav_data AND NEW.collection_id = OLD.collection_id THEN
-- Nothing for us to do
RETURN NEW;
END IF;
END IF;
IF TG_OP = 'INSERT' OR TG_OP = 'UPDATE' THEN
-- On insert or update modified, we set the NEW collection tag to the md5 of the
-- etag of the updated row which gives us something predictable for our regression
-- tests, but something different from the actual etag of the new event.
UPDATE collection
SET modified = current_timestamp, dav_etag = md5(NEW.dav_etag)
WHERE collection_id = NEW.collection_id;
IF TG_OP = 'INSERT' THEN
RETURN NEW;
END IF;
END IF;
IF TG_OP = 'DELETE' THEN
-- On delete we set the OLD collection tag to the md5 of the old path & the old
-- etag, which again gives us something predictable for our regression tests.
UPDATE collection
SET modified = current_timestamp, dav_etag = md5(OLD.dav_name::text||OLD.dav_etag)
WHERE collection_id = OLD.collection_id;
RETURN OLD;
END IF;
IF NEW.collection_id != OLD.collection_id THEN
-- If we've switched the collection_id of this event, then we also need to update
-- the etag of the old collection - as we do for delete.
UPDATE collection
SET modified = current_timestamp, dav_etag = md5(OLD.dav_name::text||OLD.dav_etag)
WHERE collection_id = OLD.collection_id;
END IF;
RETURN NEW;
END;
$$ LANGUAGE plpgsql;
CREATE TRIGGER caldav_data_modified AFTER INSERT OR UPDATE OR DELETE ON caldav_data
FOR EACH ROW EXECUTE PROCEDURE caldav_data_modified();
DROP TRIGGER caldav_data_sync_dav_id ON caldav_data CASCADE;
DROP TRIGGER calendar_item_sync_dav_id ON calendar_item CASCADE;
CREATE or REPLACE FUNCTION sync_dav_id ( ) RETURNS TRIGGER AS $$
DECLARE
BEGIN
IF TG_OP = 'DELETE' THEN
-- Just let the ON DELETE CASCADE handle this case
RETURN OLD;
END IF;
IF NEW.dav_id IS NULL THEN
NEW.dav_id = nextval('dav_id_seq');
END IF;
IF TG_OP = 'UPDATE' THEN
IF OLD.dav_id != NEW.dav_id OR OLD.collection_id != NEW.collection_id
OR OLD.user_no != NEW.user_no OR OLD.dav_name != NEW.dav_name THEN
UPDATE calendar_item SET dav_id = NEW.dav_id, user_no = NEW.user_no,
collection_id = NEW.collection_id, dav_name = NEW.dav_name
WHERE dav_name = OLD.dav_name OR dav_id = OLD.dav_id;
END IF;
RETURN NEW;
END IF;
UPDATE calendar_item SET dav_id = NEW.dav_id, user_no = NEW.user_no,
collection_id = NEW.collection_id, dav_name = NEW.dav_name
WHERE dav_name = NEW.dav_name OR dav_id = NEW.dav_id;
RETURN NEW;
END
$$ LANGUAGE 'plpgsql';
CREATE TRIGGER caldav_data_sync_dav_id AFTER INSERT OR UPDATE ON caldav_data
FOR EACH ROW EXECUTE PROCEDURE sync_dav_id();
-- New in 1.2.6
CREATE or REPLACE FUNCTION legacy_privilege_to_bits( TEXT ) RETURNS BIT(24) AS $$
DECLARE
in_priv ALIAS FOR $1;
out_bits BIT(24);
BEGIN
out_bits := 0::BIT(24);
IF in_priv ~* 'A' THEN
out_bits = ~ out_bits;
RETURN out_bits;
END IF;
-- The CALDAV:read-free-busy privilege MUST be aggregated in the DAV:read privilege.
-- 1 DAV:read
-- 512 CalDAV:read-free-busy
-- 4096 CALDAV:schedule-query-freebusy
IF in_priv ~* 'R' THEN
out_bits := out_bits | 4609::BIT(24);
END IF;
-- DAV:write => DAV:write MUST contain DAV:bind, DAV:unbind, DAV:write-properties and DAV:write-content
-- 2 DAV:write-properties
-- 4 DAV:write-content
-- 64 DAV:bind
-- 128 DAV:unbind
IF in_priv ~* 'W' THEN
out_bits := out_bits | 198::BIT(24);
END IF;
-- 64 DAV:bind
IF in_priv ~* 'B' THEN
out_bits := out_bits | 64::BIT(24);
END IF;
-- 128 DAV:unbind
IF in_priv ~* 'U' THEN
out_bits := out_bits | 128::BIT(24);
END IF;
-- 512 CalDAV:read-free-busy
-- 4096 CALDAV:schedule-query-freebusy
IF in_priv ~* 'F' THEN
out_bits := out_bits | 4608::BIT(24);
END IF;
RETURN out_bits;
END
$$
LANGUAGE 'PlPgSQL' IMMUTABLE STRICT;
-- This legacy conversion function will eventually be removed, once all logic
-- has been converted to use bitmaps, or to use the bits_to_priv() output.
--
-- NOTE: Round-trip through this and then back through legacy_privilege_to_bits
-- function is lossy! Through legacy_privilege_to_bits() and back through
-- this one is not.
--
CREATE or REPLACE FUNCTION bits_to_legacy_privilege( BIT(24) ) RETURNS TEXT AS $$
DECLARE
in_bits ALIAS FOR $1;
out_priv TEXT;
BEGIN
out_priv := '';
IF in_bits = (~ 0::BIT(24)) THEN
out_priv = 'A';
RETURN out_priv;
END IF;
-- The CALDAV:read-free-busy privilege MUST be aggregated in the DAV:read privilege.
-- 1 DAV:read
-- 512 CalDAV:read-free-busy
-- 4096 CALDAV:schedule-query-freebusy
IF (in_bits & 4609::BIT(24)) != 0::BIT(24) THEN
IF (in_bits & 1::BIT(24)) != 0::BIT(24) THEN
out_priv := 'R';
ELSE
out_priv := 'F';
END IF;
END IF;
-- DAV:write => DAV:write MUST contain DAV:bind, DAV:unbind, DAV:write-properties and DAV:write-content
-- 2 DAV:write-properties
-- 4 DAV:write-content
-- 64 DAV:bind
-- 128 DAV:unbind
IF (in_bits & 198::BIT(24)) != 0::BIT(24) THEN
IF (in_bits & 6::BIT(24)) != 0::BIT(24) THEN
out_priv := out_priv || 'W';
ELSE
IF (in_bits & 64::BIT(24)) != 0::BIT(24) THEN
out_priv := out_priv || 'B';
END IF;
IF (in_bits & 128::BIT(24)) != 0::BIT(24) THEN
out_priv := out_priv || 'U';
END IF;
END IF;
END IF;
RETURN out_priv;
END
$$
LANGUAGE 'PlPgSQL' IMMUTABLE STRICT;
CREATE or REPLACE FUNCTION get_permissions( INT, INT ) RETURNS TEXT AS $$
DECLARE
in_from ALIAS FOR $1;
in_to ALIAS FOR $2;
out_confers TEXT;
bit_confers BIT(24);
group_role_no INT;
tmp_txt TEXT;
dbg TEXT DEFAULT '';
r RECORD;
counter INT;
BEGIN
-- Self can always have full access
IF in_from = in_to THEN
RETURN 'A';
END IF;
-- dbg := 'S-';
SELECT bits_to_legacy_privilege(r1.confers) INTO out_confers FROM relationship r1
WHERE r1.from_user = in_from AND r1.to_user = in_to AND NOT usr_is_role(r1.to_user,'Group');
IF FOUND THEN
RETURN dbg || out_confers;
END IF;
-- RAISE NOTICE 'No simple relationships between % and %', in_from, in_to;
SELECT bit_or(r1.confers & r2.confers) INTO bit_confers
FROM relationship r1
JOIN relationship r2 ON r1.to_user=r2.from_user
WHERE r1.from_user=in_from AND r2.to_user=in_to
AND r2.from_user IN (SELECT user_no FROM roles LEFT JOIN role_member USING(role_no) WHERE role_name='Group');
IF bit_confers != 0::BIT(24) THEN
RETURN dbg || bits_to_legacy_privilege(bit_confers);
END IF;
RETURN '';
-- RAISE NOTICE 'No complex relationships between % and %', in_from, in_to;
SELECT bits_to_legacy_privilege(r1.confers) INTO out_confers FROM relationship r1 LEFT OUTER JOIN relationship r2 ON(r1.to_user = r2.to_user)
WHERE r1.from_user = in_from AND r2.from_user = in_to AND r1.from_user != r2.from_user
AND NOT EXISTS( SELECT 1 FROM relationship r3 WHERE r3.from_user = r1.to_user ) ;
IF FOUND THEN
-- dbg := 'H-';
-- RAISE NOTICE 'Permissions to shared group % ', out_confers;
RETURN dbg || out_confers;
END IF;
-- RAISE NOTICE 'No common group relationships between % and %', in_from, in_to;
RETURN '';
END;
$$ LANGUAGE 'plpgsql' IMMUTABLE STRICT;
CREATE or REPLACE FUNCTION get_group_role_no() RETURNS INT AS $$
SELECT role_no FROM roles WHERE role_name = 'Group'
$$ LANGUAGE 'SQL' IMMUTABLE;
CREATE or REPLACE FUNCTION has_legacy_privilege( INT, TEXT, INT ) RETURNS BOOLEAN AS $$
DECLARE
in_from ALIAS FOR $1;
in_legacy_privilege ALIAS FOR $2;
in_to ALIAS FOR $3;
in_confers BIT(24);
group_role_no INT;
BEGIN
-- Self can always have full access
IF in_from = in_to THEN
RETURN TRUE;
END IF;
SELECT get_group_role_no() INTO group_role_no;
SELECT legacy_privilege_to_bits(in_legacy_privilege) INTO in_confers;
IF EXISTS(SELECT 1 FROM relationship WHERE from_user = in_from AND to_user = in_to
AND (in_confers & confers) = in_confers
AND NOT EXISTS(SELECT 1 FROM role_member WHERE to_user = user_no AND role_no = group_role_no) ) THEN
-- A direct relationship from A to B that grants sufficient
-- RAISE NOTICE 'Permissions directly granted';
RETURN TRUE;
END IF;
IF EXISTS( SELECT 1 FROM relationship r1 JOIN relationship r2 ON r1.to_user=r2.from_user
WHERE (in_confers & r1.confers & r2.confers) = in_confers
AND r1.from_user=in_from AND r2.to_user=in_to
AND r2.from_user IN (SELECT user_no FROM role_member WHERE role_no=group_role_no) ) THEN
-- An indirect relationship from A to B via group G that grants sufficient
-- RAISE NOTICE 'Permissions mediated via group';
RETURN TRUE;
END IF;
IF EXISTS( SELECT 1 FROM relationship r1 JOIN relationship r2 ON r1.to_user=r2.to_user
WHERE (in_confers & r1.confers & r2.confers) = in_confers
AND r1.from_user=in_from AND r2.from_user=in_to
AND r2.to_user IN (SELECT user_no FROM role_member WHERE role_no=group_role_no)
AND NOT EXISTS(SELECT 1 FROM relationship WHERE from_user=r2.to_user) ) THEN
-- An indirect reflexive relationship from both A & B to group G which grants sufficient
-- RAISE NOTICE 'Permissions to shared group';
RETURN TRUE;
END IF;
-- RAISE NOTICE 'No common group relationships between % and %', in_from, in_to;
RETURN FALSE;
END;
$$ LANGUAGE 'plpgsql' IMMUTABLE STRICT;
-- Given a verbose DAV: or CalDAV: privilege name return the bitmask
CREATE or REPLACE FUNCTION privilege_to_bits( TEXT ) RETURNS BIT(24) AS $$
DECLARE
raw_priv ALIAS FOR $1;
in_priv TEXT;
BEGIN
in_priv := trim(lower(regexp_replace(raw_priv, '^.*:', '')));
IF in_priv = 'all' THEN
RETURN ~ 0::BIT(24);
END IF;
RETURN (CASE
WHEN in_priv = 'read' THEN 4609 -- 1 + 512 + 4096
WHEN in_priv = 'write' THEN 198 -- 2 + 4 + 64 + 128
WHEN in_priv = 'write-properties' THEN 2
WHEN in_priv = 'write-content' THEN 4
WHEN in_priv = 'unlock' THEN 8
WHEN in_priv = 'read-acl' THEN 16
WHEN in_priv = 'read-current-user-privilege-set' THEN 32
WHEN in_priv = 'bind' THEN 64
WHEN in_priv = 'unbind' THEN 128
WHEN in_priv = 'write-acl' THEN 256
WHEN in_priv = 'read-free-busy' THEN 4608 -- 512 + 4096
WHEN in_priv = 'schedule-deliver' THEN 7168 -- 1024 + 2048 + 4096
WHEN in_priv = 'schedule-deliver-invite' THEN 1024
WHEN in_priv = 'schedule-deliver-reply' THEN 2048
WHEN in_priv = 'schedule-query-freebusy' THEN 4096
WHEN in_priv = 'schedule-send' THEN 57344 -- 8192 + 16384 + 32768
WHEN in_priv = 'schedule-send-invite' THEN 8192
WHEN in_priv = 'schedule-send-reply' THEN 16384
WHEN in_priv = 'schedule-send-freebusy' THEN 32768
ELSE 0 END)::BIT(24);
END
$$
LANGUAGE 'PlPgSQL' IMMUTABLE STRICT;
-- Given an array of verbose DAV: or CalDAV: privilege names return the bitmask
CREATE or REPLACE FUNCTION privilege_to_bits( TEXT[] ) RETURNS BIT(24) AS $$
DECLARE
raw_privs ALIAS FOR $1;
in_priv TEXT;
out_bits BIT(24);
i INT;
all_privs BIT(24);
start INT;
finish INT;
BEGIN
out_bits := 0::BIT(24);
all_privs := ~ out_bits;
SELECT array_lower(raw_privs,1) INTO start;
SELECT array_upper(raw_privs,1) INTO finish;
FOR i IN start .. finish LOOP
SELECT out_bits | privilege_to_bits(raw_privs[i]) INTO out_bits;
IF out_bits = 65535::BIT(24) THEN
RETURN all_privs;
END IF;
END LOOP;
RETURN out_bits;
END
$$
LANGUAGE 'PlPgSQL' IMMUTABLE STRICT;
-- NOTE: Round-trip through this and then back through privilege_to_bits
-- function is lossy! Through privilege_to_bits() and back through
-- this one is not.
--
CREATE or REPLACE FUNCTION bits_to_privilege( BIT(24) ) RETURNS TEXT[] AS $$
DECLARE
in_bits ALIAS FOR $1;
out_priv TEXT[];
BEGIN
IF in_bits = (~ 0::BIT(24)) THEN
out_priv := out_priv || ARRAY['DAV:all'];
END IF;
IF (in_bits & 513::BIT(24)) != 0::BIT(24) THEN
IF (in_bits & 1::BIT(24)) != 0::BIT(24) THEN
out_priv := out_priv || ARRAY['DAV:read'];
END IF;
IF (in_bits & 512::BIT(24)) != 0::BIT(24) THEN
out_priv := out_priv || ARRAY['caldav:read-free-busy'];
END IF;
END IF;
IF (in_bits & 198::BIT(24)) != 0::BIT(24) THEN
IF (in_bits & 198::BIT(24)) = 198::BIT(24) THEN
out_priv := out_priv || ARRAY['DAV:write'];
ELSE
IF (in_bits & 2::BIT(24)) != 0::BIT(24) THEN
out_priv := out_priv || ARRAY['DAV:write-properties'];
END IF;
IF (in_bits & 4::BIT(24)) != 0::BIT(24) THEN
out_priv := out_priv || ARRAY['DAV:write-content'];
END IF;
IF (in_bits & 64::BIT(24)) != 0::BIT(24) THEN
out_priv := out_priv || ARRAY['DAV:bind'];
END IF;
IF (in_bits & 128::BIT(24)) != 0::BIT(24) THEN
out_priv := out_priv || ARRAY['DAV:unbind'];
END IF;
END IF;
END IF;
IF (in_bits & 8::BIT(24)) != 0::BIT(24) THEN
out_priv := out_priv || ARRAY['DAV:unlock'];
END IF;
IF (in_bits & 16::BIT(24)) != 0::BIT(24) THEN
out_priv := out_priv || ARRAY['DAV:read-acl'];
END IF;
IF (in_bits & 32::BIT(24)) != 0::BIT(24) THEN
out_priv := out_priv || ARRAY['DAV:read-current-user-privilege-set'];
END IF;
IF (in_bits & 256::BIT(24)) != 0::BIT(24) THEN
out_priv := out_priv || ARRAY['DAV:write-acl'];
END IF;
IF (in_bits & 7168::BIT(24)) != 0::BIT(24) THEN
IF (in_bits & 7168::BIT(24)) = 7168::BIT(24) THEN
out_priv := out_priv || ARRAY['caldav:schedule-deliver'];
ELSE
IF (in_bits & 1024::BIT(24)) != 0::BIT(24) THEN
out_priv := out_priv || ARRAY['caldav:schedule-deliver-invite'];
END IF;
IF (in_bits & 2048::BIT(24)) != 0::BIT(24) THEN
out_priv := out_priv || ARRAY['caldav:schedule-deliver-reply'];
END IF;
IF (in_bits & 4096::BIT(24)) != 0::BIT(24) THEN
out_priv := out_priv || ARRAY['caldav:schedule-query-freebusy'];
END IF;
END IF;
END IF;
IF (in_bits & 57344::BIT(24)) != 0::BIT(24) THEN
IF (in_bits & 57344::BIT(24)) = 57344::BIT(24) THEN
out_priv := out_priv || ARRAY['caldav:schedule-send'];
ELSE
IF (in_bits & 8192::BIT(24)) != 0::BIT(24) THEN
out_priv := out_priv || ARRAY['caldav:schedule-send-invite'];
END IF;
IF (in_bits & 16384::BIT(24)) != 0::BIT(24) THEN
out_priv := out_priv || ARRAY['caldav:schedule-send-reply'];
END IF;
IF (in_bits & 32768::BIT(24)) != 0::BIT(24) THEN
out_priv := out_priv || ARRAY['caldav:schedule-send-freebusy'];
END IF;
END IF;
END IF;
RETURN out_priv;
END
$$
LANGUAGE 'PlPgSQL' IMMUTABLE STRICT;
-- Expanded group memberships out to some depth
CREATE or REPLACE FUNCTION expand_memberships( INT8, INT ) RETURNS SETOF INT8 AS $$
SELECT group_id FROM group_member WHERE member_id = $1
UNION
SELECT expanded.g_id FROM (SELECT CASE WHEN $2 > 0 THEN expand_memberships( group_id, $2 - 1) END AS g_id
FROM group_member WHERE member_id = $1) AS expanded
WHERE expanded.g_id IS NOT NULL;
$$ LANGUAGE 'SQL' STABLE STRICT;
-- Expanded group members out to some depth
CREATE or REPLACE FUNCTION expand_members( INT8, INT ) RETURNS SETOF INT8 AS $$
SELECT member_id FROM group_member WHERE group_id = $1
UNION
SELECT expanded.m_id FROM (SELECT CASE WHEN $2 > 0 THEN expand_members( member_id, $2 - 1) END AS m_id
FROM group_member WHERE group_id = $1) AS expanded
WHERE expanded.m_id IS NOT NULL;
$$ LANGUAGE 'SQL' STABLE STRICT;
-- Privileges from accessor to grantor, by principal_id
CREATE or REPLACE FUNCTION pprivs( INT8, INT8, INT ) RETURNS BIT(24) AS $$
DECLARE
in_accessor ALIAS FOR $1;
in_grantor ALIAS FOR $2;
in_depth ALIAS FOR $3;
out_conferred BIT(24);
BEGIN
out_conferred := 0::BIT(24);
-- Self can always have full access
IF in_grantor = in_accessor THEN
RETURN ~ out_conferred;
END IF;
SELECT bit_or(subquery.privileges) INTO out_conferred FROM
(
SELECT privileges FROM grants WHERE by_principal=in_grantor AND by_collection IS NULL
AND (to_principal=in_accessor OR to_principal IN (SELECT expand_memberships(in_accessor,in_depth)))
UNION
SELECT 32::BIT(24) AS privileges FROM expand_memberships(in_accessor,in_depth) WHERE expand_memberships = in_grantor
) AS subquery ;
IF out_conferred IS NULL THEN
SELECT default_privileges INTO out_conferred FROM principal WHERE principal_id = in_grantor;
END IF;
RETURN out_conferred;
END;
$$ LANGUAGE 'plpgsql' STABLE STRICT;
-- Privileges from accessor to grantor, by user_no
CREATE or REPLACE FUNCTION uprivs( INT8, INT8, INT ) RETURNS BIT(24) AS $$
DECLARE
in_accessor ALIAS FOR $1;
in_grantor ALIAS FOR $2;
in_depth ALIAS FOR $3;
out_conferred BIT(24);
BEGIN
out_conferred := 0::BIT(24);
-- Self can always have full access
IF in_grantor = in_accessor THEN
RETURN ~ out_conferred;
END IF;
SELECT pprivs( p1.principal_id, p2.principal_id, in_depth ) INTO out_conferred
FROM principal p1, principal p2
WHERE p1.user_no = in_accessor AND p2.user_no = in_grantor;
RETURN out_conferred;
END;
$$ LANGUAGE 'plpgsql' STABLE STRICT;
-- Privileges from accessor (by principal_id) to path
CREATE or REPLACE FUNCTION path_privs( INT8, TEXT, INT ) RETURNS BIT(24) AS $$
DECLARE
in_accessor ALIAS FOR $1;
in_path ALIAS FOR $2;
in_depth ALIAS FOR $3;
alt1_path TEXT;
alt2_path TEXT;
grantor_collection INT8;
grantor_principal INT8;
collection_path TEXT;
collection_privileges BIT(24);
out_conferred BIT(24);
BEGIN
out_conferred := 0::BIT(24);
IF in_path ~ '^/?$' THEN
-- RAISE NOTICE 'Collection is root: Collection: %', in_path;
RETURN 1; -- basic read privileges on root directory
END IF;
-- We need to canonicalise the path, so:
-- If it matches '/' + some characters (+ optional '/') => a principal URL
IF in_path ~ '^/[^/]+/?$' THEN
alt1_path := replace(in_path, '/', '');
SELECT pprivs(in_accessor,principal_id, in_depth) INTO out_conferred FROM usr JOIN principal USING(user_no) WHERE username = alt1_path;
-- RAISE NOTICE 'Path is Principal: Principal: %, Collection: %, Permissions: %', in_accessor, in_path, out_conferred;
RETURN out_conferred;
END IF;
-- Otherwise look for the longest segment matching up to the last '/', or if we append one, or if we replace a final '.ics' with one.
alt1_path := in_path;
IF alt1_path ~ E'\\.ics$' THEN
alt1_path := substr(alt1_path, 1, length(alt1_path) - 4) || '/';
END IF;
alt2_path := regexp_replace( in_path, '[^/]*$', '');
SELECT collection.collection_id, grantor.principal_id, collection.dav_name, collection.default_privileges
INTO grantor_collection, grantor_principal, collection_path, collection_privileges
FROM collection JOIN principal grantor USING (user_no)
WHERE dav_name = in_path || '/' OR dav_name = alt1_path OR dav_name = alt2_path
ORDER BY LENGTH(collection.dav_name) DESC LIMIT 1;
-- Self will always need full access to their own collections!
IF grantor_principal = in_accessor THEN
-- RAISE NOTICE 'Principal IS owner: Principal: %, Collection: %', in_accessor, in_path;
RETURN ~ out_conferred;
END IF;
SELECT privileges INTO out_conferred FROM grants
WHERE by_collection = grantor_collection
AND (to_principal=in_accessor OR to_principal IN (SELECT expand_memberships(in_accessor,in_depth)));
IF out_conferred IS NULL THEN
IF collection_privileges IS NULL THEN
IF grantor_principal IS NULL THEN
alt1_path := regexp_replace( in_path, '/[^/]+/?$', '/');
SELECT path_privs(in_accessor,alt1_path,in_depth) INTO out_conferred;
-- RAISE NOTICE 'Collection is NULL: Principal: %, Collection: %, Permissions: %', in_accessor, in_path, out_conferred;
ELSE
SELECT pprivs(in_accessor,grantor_principal,in_depth) INTO out_conferred;
-- RAISE NOTICE 'Collection priveleges are NULL: Principal: %, Collection: %, Permissions: %', in_accessor, in_path, out_conferred;
END IF;
ELSE
out_conferred := collection_privileges;
-- RAISE NOTICE 'Default Collection priveleges apply: Principal: %, Collection: %, Permissions: %', in_accessor, in_path, out_conferred;
END IF;
END IF;
RETURN out_conferred;
END;
$$ LANGUAGE 'plpgsql' STABLE STRICT;
-- List a user's memberships as a text string
CREATE or REPLACE FUNCTION is_member_of_list( INT8 ) RETURNS TEXT AS $$
DECLARE
in_member_id ALIAS FOR $1;
m RECORD;
mlist TEXT;
BEGIN
mlist := '';
FOR m IN SELECT displayname, group_id FROM group_member JOIN principal ON (group_id = principal_id)
WHERE member_id = in_member_id
LOOP
mlist := mlist
|| CASE WHEN mlist = '' THEN '' ELSE ', ' END
|| COALESCE( m.displayname, m.group_id::text);
END LOOP;
RETURN mlist;
END;
$$ LANGUAGE 'plpgsql' STRICT;
-- List a user's members as a text string
CREATE or REPLACE FUNCTION has_members_list( INT8 ) RETURNS TEXT AS $$
DECLARE
in_member_id ALIAS FOR $1;
m RECORD;
mlist TEXT;
BEGIN
mlist := '';
FOR m IN SELECT displayname, group_id FROM group_member JOIN principal ON (member_id = principal_id)
WHERE group_id = in_member_id
LOOP
mlist := mlist
|| CASE WHEN mlist = '' THEN '' ELSE ', ' END
|| COALESCE( m.displayname, m.group_id::text);
END LOOP;
RETURN mlist;
END;
$$ LANGUAGE 'plpgsql' STRICT;
-- List the privileges as a text string
CREATE or REPLACE FUNCTION privileges_list( BIT(24) ) RETURNS TEXT AS $$
DECLARE
in_privileges ALIAS FOR $1;
privileges TEXT[];
plist TEXT;
start INT;
finish INT;
i INT;
BEGIN
plist := '';
privileges := bits_to_privilege(in_privileges);
SELECT array_lower(privileges,1) INTO start;
IF start IS NOT NULL THEN
SELECT array_upper(privileges,1) INTO finish;
FOR i IN start .. finish LOOP
plist := plist
|| CASE WHEN plist = '' THEN '' ELSE ', ' END
|| privileges[i];
END LOOP;
END IF;
RETURN plist;
END;
$$ LANGUAGE 'plpgsql' IMMUTABLE STRICT;
DROP TRIGGER principal_modified ON principal CASCADE;
CREATE or REPLACE FUNCTION principal_modified() RETURNS TRIGGER AS $$
DECLARE
BEGIN
-- in case we trigger on other events in future
IF TG_OP = 'UPDATE' THEN
IF NEW.type_id != OLD.type_id THEN
UPDATE grants
SET is_group = (NEW.type_id = 3)
WHERE grants.to_principal = NEW.principal_id;
END IF;
END IF;
RETURN NEW;
END;
$$ LANGUAGE plpgsql;
CREATE TRIGGER principal_modified AFTER UPDATE ON principal
FOR EACH ROW EXECUTE PROCEDURE principal_modified();
DROP TRIGGER grants_modified ON grants CASCADE;
CREATE or REPLACE FUNCTION grants_modified() RETURNS TRIGGER AS $$
DECLARE
old_to_principal INT8;
new_is_group BOOL;
BEGIN
-- in case we trigger on other events in future
IF TG_OP = 'INSERT' THEN
old_to_principal := NULL;
ELSE
old_to_principal := OLD.to_principal;
END IF;
IF TG_OP = 'INSERT' OR NEW.to_principal != old_to_principal THEN
SELECT (type_id = 3) INTO new_is_group FROM principal WHERE principal_id = NEW.to_principal;
IF NEW.is_group != new_is_group THEN
NEW.is_group := new_is_group;
END IF;
END IF;
RETURN NEW;
END;
$$ LANGUAGE plpgsql;
CREATE TRIGGER grants_modified AFTER INSERT OR UPDATE ON grants
FOR EACH ROW EXECUTE PROCEDURE grants_modified();
-- An expanded list of the grants this principal has access to
CREATE or REPLACE FUNCTION p_has_proxy_access_to( INT8, INT ) RETURNS SETOF INT8 AS $$
SELECT by_principal
FROM (
SELECT by_principal FROM grants
WHERE to_principal IN (SELECT $1 UNION SELECT expand_memberships($1,$2))
AND (privileges & 5::BIT(24)) != 0::BIT(24)
AND by_collection IS NULL
AND by_principal != $1
UNION
SELECT principal_id AS by_principal FROM principal
WHERE (default_privileges & 5::BIT(24)) != 0::BIT(24)
AND principal_id != $1
) subquery;
$$ LANGUAGE 'SQL' STABLE STRICT;
-- A list of the principals who can proxy to this principal
CREATE or REPLACE FUNCTION grants_proxy_access_from_p( INT8, INT ) RETURNS SETOF INT8 AS $$
SELECT DISTINCT by_principal
FROM grants
WHERE by_collection IS NULL AND by_principal != $1
AND by_principal IN (SELECT expand_members(g2.to_principal,$2) FROM grants g2 WHERE g2.by_principal = $1)
;
$$ LANGUAGE 'SQL' STABLE STRICT;
-- New in 1.2.7
CREATE or REPLACE FUNCTION write_sync_change( INT8, INT, TEXT ) RETURNS BOOLEAN AS $$
DECLARE
in_collection_id ALIAS FOR $1;
in_status ALIAS FOR $2;
in_dav_name ALIAS FOR $3;
tmp_int INT8;
BEGIN
SELECT 1 INTO tmp_int FROM sync_tokens
WHERE collection_id = in_collection_id
LIMIT 1;
IF NOT FOUND THEN
RETURN FALSE;
END IF;
SELECT dav_id INTO tmp_int FROM caldav_data WHERE dav_name = in_dav_name;
INSERT INTO sync_changes ( collection_id, sync_status, dav_id, dav_name)
VALUES( in_collection_id, in_status, tmp_int, in_dav_name);
RETURN TRUE;
END
$$ LANGUAGE 'PlPgSQL' VOLATILE STRICT;
CREATE or REPLACE FUNCTION new_sync_token( INT8, INT8 ) RETURNS INT8 AS $$
DECLARE
in_old_sync_token ALIAS FOR $1;
in_collection_id ALIAS FOR $2;
tmp_int INT8;
old_modification_time sync_tokens.modification_time%TYPE;
BEGIN
IF in_old_sync_token > 0 THEN
SELECT modification_time INTO old_modification_time FROM sync_tokens WHERE sync_token = in_old_sync_token;
IF NOT FOUND THEN
-- They are in an inconsistent state: we return NULL so they can re-start the process
RETURN NULL;
END IF;
SELECT 1 INTO tmp_int FROM sync_changes WHERE collection_id = in_collection_id AND sync_time > old_modification_time LIMIT 1;
IF NOT FOUND THEN
-- Ensure we return the latest sync_token we have for this collection, since there are
-- no changes.
SELECT sync_token INTO tmp_int FROM sync_tokens WHERE collection_id = in_collection_id ORDER BY modification_time DESC LIMIT 1;
RETURN tmp_int;
END IF;
END IF;
SELECT nextval('sync_tokens_sync_token_seq') INTO tmp_int;
INSERT INTO sync_tokens(collection_id, sync_token) VALUES( in_collection_id, tmp_int );
RETURN tmp_int;
END
$$ LANGUAGE 'PlPgSQL' STRICT;
DROP TRIGGER alarm_changed ON calendar_alarm CASCADE;
CREATE or REPLACE FUNCTION alarm_changed() RETURNS TRIGGER AS $$
DECLARE
oldcomponent TEXT;
newcomponent TEXT;
BEGIN
-- in case we trigger on other events in future
IF TG_OP = 'UPDATE' THEN
IF NEW.component != OLD.component THEN
UPDATE caldav_data
SET caldav_data = replace( caldav_data, OLD.component, NEW.component ),
dav_etag = md5(replace( caldav_data, OLD.component, NEW.component ))
WHERE caldav_data.dav_id = NEW.dav_id;
END IF;
END IF;
RETURN NEW;
END;
$$ LANGUAGE plpgsql;
CREATE TRIGGER alarm_changed AFTER UPDATE ON calendar_alarm
FOR EACH ROW EXECUTE PROCEDURE alarm_changed();
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