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765cbfdc92
Remove duplicate implementations of catalog munging and miscellaneous privilege checks. Instead rely on already existing data in objectaddress.c to do the work. Author: KaiGai Kohei, changes by me Reviewed by: Robert Haas, Álvaro Herrera, Dimitri Fontaine
117 lines
3.6 KiB
C
117 lines
3.6 KiB
C
/*-------------------------------------------------------------------------
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*
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* conversioncmds.c
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* conversion creation command support code
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*
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* Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* src/backend/commands/conversioncmds.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "access/heapam.h"
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#include "access/htup_details.h"
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#include "catalog/dependency.h"
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#include "catalog/indexing.h"
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#include "catalog/pg_conversion.h"
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#include "catalog/pg_conversion_fn.h"
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#include "catalog/pg_type.h"
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#include "commands/alter.h"
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#include "commands/conversioncmds.h"
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#include "mb/pg_wchar.h"
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#include "miscadmin.h"
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#include "parser/parse_func.h"
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#include "utils/builtins.h"
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#include "utils/lsyscache.h"
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#include "utils/rel.h"
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#include "utils/syscache.h"
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/*
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* CREATE CONVERSION
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*/
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Oid
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CreateConversionCommand(CreateConversionStmt *stmt)
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{
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Oid namespaceId;
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char *conversion_name;
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AclResult aclresult;
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int from_encoding;
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int to_encoding;
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Oid funcoid;
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const char *from_encoding_name = stmt->for_encoding_name;
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const char *to_encoding_name = stmt->to_encoding_name;
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List *func_name = stmt->func_name;
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static Oid funcargs[] = {INT4OID, INT4OID, CSTRINGOID, INTERNALOID, INT4OID};
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char result[1];
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/* Convert list of names to a name and namespace */
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namespaceId = QualifiedNameGetCreationNamespace(stmt->conversion_name,
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&conversion_name);
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/* Check we have creation rights in target namespace */
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aclresult = pg_namespace_aclcheck(namespaceId, GetUserId(), ACL_CREATE);
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if (aclresult != ACLCHECK_OK)
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aclcheck_error(aclresult, ACL_KIND_NAMESPACE,
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get_namespace_name(namespaceId));
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/* Check the encoding names */
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from_encoding = pg_char_to_encoding(from_encoding_name);
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if (from_encoding < 0)
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ereport(ERROR,
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(errcode(ERRCODE_UNDEFINED_OBJECT),
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errmsg("source encoding \"%s\" does not exist",
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from_encoding_name)));
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to_encoding = pg_char_to_encoding(to_encoding_name);
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if (to_encoding < 0)
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ereport(ERROR,
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(errcode(ERRCODE_UNDEFINED_OBJECT),
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errmsg("destination encoding \"%s\" does not exist",
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to_encoding_name)));
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/*
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* Check the existence of the conversion function. Function name could be
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* a qualified name.
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*/
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funcoid = LookupFuncName(func_name, sizeof(funcargs) / sizeof(Oid),
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funcargs, false);
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/* Check it returns VOID, else it's probably the wrong function */
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if (get_func_rettype(funcoid) != VOIDOID)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
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errmsg("encoding conversion function %s must return type \"void\"",
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NameListToString(func_name))));
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/* Check we have EXECUTE rights for the function */
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aclresult = pg_proc_aclcheck(funcoid, GetUserId(), ACL_EXECUTE);
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if (aclresult != ACLCHECK_OK)
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aclcheck_error(aclresult, ACL_KIND_PROC,
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NameListToString(func_name));
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/*
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* Check that the conversion function is suitable for the requested source
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* and target encodings. We do that by calling the function with an empty
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* string; the conversion function should throw an error if it can't
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* perform the requested conversion.
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*/
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OidFunctionCall5(funcoid,
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Int32GetDatum(from_encoding),
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Int32GetDatum(to_encoding),
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CStringGetDatum(""),
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CStringGetDatum(result),
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Int32GetDatum(0));
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/*
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* All seem ok, go ahead (possible failure would be a duplicate conversion
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* name)
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*/
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return ConversionCreate(conversion_name, namespaceId, GetUserId(),
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from_encoding, to_encoding, funcoid, stmt->def);
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}
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