Refine rules for altering publication owner

Previously, the new owner had to be a superuser.  The new rules are more
refined similar to other objects.
Reviewed-by: Petr Jelinek <petr.jelinek@2ndquadrant.com>

doc/src/sgml/ref/alter_publication.sgml

@@ -48,8 +48,11 @@ ALTER PUBLICATION <replaceable class="PARAMETER">name</replaceable> DROP TABLE <
   </para>
 
   <para>
-   To alter the owner, you must also be a direct or indirect member of the
-   new owning role. The new owner has to be a superuser
+   To alter the owner, you must also be a direct or indirect member of the new
+   owning role. The new owner must have <literal>CREATE</literal> privilege on
+   the database.  Also, the new owner of a <literal>FOR ALL TABLES</literal>
+   publication must be a superuser.  However, a superuser can change the
+   ownership of a publication while circumventing these restrictions.
   </para>
 
   <para>

src/backend/commands/publicationcmds.c

@@ -670,17 +670,31 @@ AlterPublicationOwner_internal(Relation rel, HeapTuple tup, Oid newOwnerId)
 	if (form->pubowner == newOwnerId)
 		return;
 
+	if (!superuser())
+	{
+		AclResult	aclresult;
+
+		/* Must be owner */
 		if (!pg_publication_ownercheck(HeapTupleGetOid(tup), GetUserId()))
 			aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_PUBLICATION,
 						   NameStr(form->pubname));
 
-	/* New owner must be a superuser */
-	if (!superuser_arg(newOwnerId))
+		/* Must be able to become new owner */
+		check_is_member_of_role(GetUserId(), newOwnerId);
+
+		/* New owner must have CREATE privilege on database */
+		aclresult = pg_database_aclcheck(MyDatabaseId, newOwnerId, ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, ACL_KIND_DATABASE,
+						   get_database_name(MyDatabaseId));
+
+		if (form->puballtables && !superuser_arg(newOwnerId))
 			ereport(ERROR,
 					(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
 					 errmsg("permission denied to change owner of publication \"%s\"",
 							NameStr(form->pubname)),
-				 errhint("The owner of a publication must be a superuser.")));
+					 errhint("The owner of a FOR ALL TABLES publication must be a superuser.")));
+	}
 
 	form->pubowner = newOwnerId;
 	CatalogTupleUpdate(rel, &tup->t_self, tup);

src/test/regress/expected/publication.out

@@ -182,6 +182,14 @@ ALTER PUBLICATION testpub_default RENAME TO testpub_foo;
 
 -- rename back to keep the rest simple
 ALTER PUBLICATION testpub_foo RENAME TO testpub_default;
+ALTER PUBLICATION testpub_default OWNER TO regress_publication_user2;
+\dRp testpub_default
+                           List of publications
+      Name       |           Owner           | Inserts | Updates | Deletes 
+-----------------+---------------------------+---------+---------+---------
+ testpub_default | regress_publication_user2 | t       | t       | t
+(1 row)
+
 DROP PUBLICATION testpub_default;
 DROP PUBLICATION testpib_ins_trunct;
 DROP PUBLICATION testpub_fortbl;

src/test/regress/sql/publication.sql

@@ -108,6 +108,10 @@ ALTER PUBLICATION testpub_default RENAME TO testpub_foo;
 -- rename back to keep the rest simple
 ALTER PUBLICATION testpub_foo RENAME TO testpub_default;
 
+ALTER PUBLICATION testpub_default OWNER TO regress_publication_user2;
+
+\dRp testpub_default
+
 DROP PUBLICATION testpub_default;
 DROP PUBLICATION testpib_ins_trunct;
 DROP PUBLICATION testpub_fortbl;