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/*-------------------------------------------------------------------------
*
* conversioncmds.c
* conversion creation command support code
*
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/conversioncmds.c,v 1.16.4.1 2005-05-03 19:18:15 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "catalog/pg_conversion.h"
#include "access/heapam.h"
#include "catalog/catalog.h"
#include "catalog/catname.h"
#include "catalog/indexing.h"
#include "catalog/namespace.h"
#include "catalog/pg_type.h"
#include "mb/pg_wchar.h"
#include "commands/conversioncmds.h"
#include "miscadmin.h"
#include "parser/parse_func.h"
#include "utils/acl.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"
/*
* CREATE CONVERSION
*/
void
CreateConversionCommand(CreateConversionStmt *stmt)
{
Oid namespaceId;
char *conversion_name;
AclResult aclresult;
int from_encoding;
int to_encoding;
Oid funcoid;
const char *from_encoding_name = stmt->for_encoding_name;
const char *to_encoding_name = stmt->to_encoding_name;
List *func_name = stmt->func_name;
static Oid funcargs[] = {INT4OID, INT4OID, CSTRINGOID, INTERNALOID, INT4OID};
/* Convert list of names to a name and namespace */
namespaceId = QualifiedNameGetCreationNamespace(stmt->conversion_name,
&conversion_name);
/* Check we have creation rights in target namespace */
aclresult = pg_namespace_aclcheck(namespaceId, GetUserId(), ACL_CREATE);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, ACL_KIND_NAMESPACE,
get_namespace_name(namespaceId));
/* Check the encoding names */
from_encoding = pg_char_to_encoding(from_encoding_name);
if (from_encoding < 0)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("source encoding \"%s\" does not exist",
from_encoding_name)));
to_encoding = pg_char_to_encoding(to_encoding_name);
if (to_encoding < 0)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("destination encoding \"%s\" does not exist",
to_encoding_name)));
/*
* Check the existence of the conversion function. Function name could
* be a qualified name.
*/
funcoid = LookupFuncName(func_name, sizeof(funcargs) / sizeof(Oid),
funcargs, false);
/* Check we have EXECUTE rights for the function */
aclresult = pg_proc_aclcheck(funcoid, GetUserId(), ACL_EXECUTE);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, ACL_KIND_PROC,
NameListToString(func_name));
/*
* All seem ok, go ahead (possible failure would be a duplicate
* conversion name)
*/
ConversionCreate(conversion_name, namespaceId, GetUserId(),
from_encoding, to_encoding, funcoid, stmt->def);
}
/*
* DROP CONVERSION
*/
void
DropConversionCommand(List *name, DropBehavior behavior)
{
Oid conversionOid;
conversionOid = FindConversionByName(name);
if (!OidIsValid(conversionOid))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("conversion \"%s\" does not exist",
NameListToString(name))));
ConversionDrop(conversionOid, behavior);
}
/*
* Rename conversion
*/
void
RenameConversion(List *name, const char *newname)
{
Oid conversionOid;
Oid namespaceOid;
HeapTuple tup;
Relation rel;
AclResult aclresult;
rel = heap_openr(ConversionRelationName, RowExclusiveLock);
conversionOid = FindConversionByName(name);
if (!OidIsValid(conversionOid))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("conversion \"%s\" does not exist",
NameListToString(name))));
tup = SearchSysCacheCopy(CONOID,
ObjectIdGetDatum(conversionOid),
0, 0, 0);
if (!HeapTupleIsValid(tup)) /* should not happen */
elog(ERROR, "cache lookup failed for conversion %u", conversionOid);
namespaceOid = ((Form_pg_conversion) GETSTRUCT(tup))->connamespace;
/* make sure the new name doesn't exist */
if (SearchSysCacheExists(CONNAMENSP,
CStringGetDatum(newname),
ObjectIdGetDatum(namespaceOid),
0, 0))
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_OBJECT),
errmsg("conversion \"%s\" already exists in schema \"%s\"",
newname, get_namespace_name(namespaceOid))));
/* must be owner */
if (!superuser() &&
((Form_pg_conversion) GETSTRUCT(tup))->conowner != GetUserId())
aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_CONVERSION,
NameListToString(name));
/* must have CREATE privilege on namespace */
aclresult = pg_namespace_aclcheck(namespaceOid, GetUserId(), ACL_CREATE);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, ACL_KIND_NAMESPACE,
get_namespace_name(namespaceOid));
/* rename */
namestrcpy(&(((Form_pg_conversion) GETSTRUCT(tup))->conname), newname);
simple_heap_update(rel, &tup->t_self, tup);
CatalogUpdateIndexes(rel, tup);
heap_close(rel, NoLock);
heap_freetuple(tup);
}
/*
* Change conversion owner
*/
void
AlterConversionOwner(List *name, AclId newOwnerSysId)
{
Oid conversionOid;
HeapTuple tup;
Relation rel;
Form_pg_conversion convForm;
rel = heap_openr(ConversionRelationName, RowExclusiveLock);
conversionOid = FindConversionByName(name);
if (!OidIsValid(conversionOid))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("conversion \"%s\" does not exist",
NameListToString(name))));
tup = SearchSysCacheCopy(CONOID,
ObjectIdGetDatum(conversionOid),
0, 0, 0);
if (!HeapTupleIsValid(tup)) /* should not happen */
elog(ERROR, "cache lookup failed for conversion %u", conversionOid);
convForm = (Form_pg_conversion) GETSTRUCT(tup);
/*
* If the new owner is the same as the existing owner, consider the
* command to have succeeded. This is for dump restoration purposes.
*/
if (convForm->conowner != newOwnerSysId)
{
/* Otherwise, must be superuser to change object ownership */
if (!superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("must be superuser to change owner")));
/*
* Modify the owner --- okay to scribble on tup because it's a
* copy
*/
convForm->conowner = newOwnerSysId;
simple_heap_update(rel, &tup->t_self, tup);
CatalogUpdateIndexes(rel, tup);
}
heap_close(rel, NoLock);
heap_freetuple(tup);
}
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