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|
/*
Unix SMB/CIFS implementation.
Main metadata server / Spotlight routines
Copyright (C) Ralph Boehme 2012-2014
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
%{
#include "includes.h"
#include "rpc_server/mdssvc/mdssvc.h"
#include "rpc_server/mdssvc/mdssvc_tracker.h"
#include "rpc_server/mdssvc/sparql_parser.tab.h"
#include "rpc_server/mdssvc/sparql_mapping.h"
#define YYMALLOC SMB_MALLOC
#define YYREALLOC SMB_REALLOC
struct yy_buffer_state;
typedef struct yy_buffer_state *YY_BUFFER_STATE;
extern int mdsyylex (void);
extern void mdsyyerror (char const *);
extern void *mdsyyterminate(void);
extern YY_BUFFER_STATE mdsyy_scan_string( const char *str);
extern void mdsyy_delete_buffer ( YY_BUFFER_STATE buffer );
/* forward declarations */
static const char *map_expr(const char *attr, char op, const char *val);
static const char *map_daterange(const char *dateattr,
time_t date1, time_t date2);
static time_t isodate2unix(const char *s);
/* global vars, eg needed by the lexer */
struct sparql_parser_state {
TALLOC_CTX *frame;
YY_BUFFER_STATE s;
char var;
const char *result;
} *global_sparql_parser_state;
%}
%code provides {
#include <stdbool.h>
#include "rpc_server/mdssvc/mdssvc.h"
#define SPRAW_TIME_OFFSET 978307200
extern int mdsyywrap(void);
extern bool map_spotlight_to_sparql_query(struct sl_query *slq);
}
%union {
int ival;
const char *sval;
bool bval;
time_t tval;
}
%name-prefix "mdsyy"
%expect 5
%error-verbose
%type <sval> match expr line function
%type <tval> date
%token <sval> WORD
%token <bval> BOOL
%token FUNC_INRANGE
%token DATE_ISO
%token OBRACE CBRACE EQUAL UNEQUAL GT LT COMMA QUOTE
%left AND
%left OR
%%
input:
/* empty */
| input line
;
line:
expr {
global_sparql_parser_state->result = $1;
}
;
expr:
BOOL {
/*
* We can't properly handle these in expressions, fortunately this
* is probably only ever used by OS X as sole element in an
* expression ie "False" (when Finder window selected our share
* but no search string entered yet). Packet traces showed that OS
* X Spotlight server then returns a failure (ie -1) which is what
* we do here too by calling YYABORT.
*/
YYABORT;
}
/*
* We have "match OR match" and "expr OR expr", because the former is
* supposed to catch and coalesque expressions of the form
*
* MDSattribute1="hello"||MDSattribute2="hello"
*
* into a single SPARQL expression for the case where both
* MDSattribute1 and MDSattribute2 map to the same SPARQL attribute,
* which is eg the case for "*" and "kMDItemTextContent" which both
* map to SPARQL "fts:match".
*/
| match OR match {
if (strcmp($1, $3) != 0) {
$$ = talloc_asprintf(talloc_tos(), "{ %s } UNION { %s }", $1, $3);
} else {
$$ = talloc_asprintf(talloc_tos(), "%s", $1);
}
}
| match {
$$ = $1;
}
| function {
$$ = $1;
}
| OBRACE expr CBRACE {
$$ = talloc_asprintf(talloc_tos(), "%s", $2);
}
| expr AND expr {
$$ = talloc_asprintf(talloc_tos(), "%s . %s", $1, $3);
}
| expr OR expr {
if (strcmp($1, $3) != 0) {
$$ = talloc_asprintf(talloc_tos(), "{ %s } UNION { %s }", $1, $3);
} else {
$$ = talloc_asprintf(talloc_tos(), "%s", $1);
}
}
;
match:
WORD EQUAL QUOTE WORD QUOTE {
$$ = map_expr($1, '=', $4);
if ($$ == NULL) YYABORT;
}
| WORD UNEQUAL QUOTE WORD QUOTE {
$$ = map_expr($1, '!', $4);
if ($$ == NULL) YYABORT;
}
| WORD LT QUOTE WORD QUOTE {
$$ = map_expr($1, '<', $4);
if ($$ == NULL) YYABORT;
}
| WORD GT QUOTE WORD QUOTE {
$$ = map_expr($1, '>', $4);
if ($$ == NULL) YYABORT;
}
| WORD EQUAL QUOTE WORD QUOTE WORD {
$$ = map_expr($1, '=', $4);
if ($$ == NULL) YYABORT;
}
| WORD UNEQUAL QUOTE WORD QUOTE WORD {
$$ = map_expr($1, '!', $4);
if ($$ == NULL) YYABORT;
}
| WORD LT QUOTE WORD QUOTE WORD {
$$ = map_expr($1, '<', $4);
if ($$ == NULL) YYABORT;
}
| WORD GT QUOTE WORD QUOTE WORD {
$$ = map_expr($1, '>', $4);
if ($$ == NULL) YYABORT;
}
;
function:
FUNC_INRANGE OBRACE WORD COMMA date COMMA date CBRACE {
$$ = map_daterange($3, $5, $7);
if ($$ == NULL) YYABORT;
}
;
date:
DATE_ISO OBRACE WORD CBRACE {$$ = isodate2unix($3);}
| WORD {$$ = atoi($1) + SPRAW_TIME_OFFSET;}
;
%%
static time_t isodate2unix(const char *s)
{
struct tm tm = {};
const char *p;
p = strptime(s, "%Y-%m-%dT%H:%M:%SZ", &tm);
if (p == NULL) {
return (time_t)-1;
}
return mktime(&tm);
}
static const char *map_daterange(const char *dateattr,
time_t date1, time_t date2)
{
struct sparql_parser_state *s = global_sparql_parser_state;
int result = 0;
char *sparql = NULL;
const struct sl_attr_map *p;
struct tm *tmp;
char buf1[64], buf2[64];
if (s->var == 'z') {
return NULL;
}
tmp = localtime(&date1);
if (tmp == NULL) {
return NULL;
}
result = strftime(buf1, sizeof(buf1), "%Y-%m-%dT%H:%M:%SZ", tmp);
if (result == 0) {
return NULL;
}
tmp = localtime(&date2);
if (tmp == NULL) {
return NULL;
}
result = strftime(buf2, sizeof(buf2), "%Y-%m-%dT%H:%M:%SZ", tmp);
if (result == 0) {
return NULL;
}
p = sl_attr_map_by_spotlight(dateattr);
if (p == NULL) {
return NULL;
}
sparql = talloc_asprintf(talloc_tos(),
"?obj %s ?%c FILTER (?%c > '%s' && ?%c < '%s')",
p->sparql_attr,
s->var,
s->var,
buf1,
s->var,
buf2);
if (sparql == NULL) {
return NULL;
}
s->var++;
return sparql;
}
static char *map_type_search(const char *attr, char op, const char *val)
{
char *result = NULL;
const char *sparqlAttr;
const struct sl_type_map *p;
p = sl_type_map_by_spotlight(val);
if (p == NULL) {
return NULL;
}
switch (p->type) {
case kMDTypeMapRDF:
sparqlAttr = "rdf:type";
break;
case kMDTypeMapMime:
sparqlAttr = "nie:mimeType";
break;
default:
return NULL;
}
result = talloc_asprintf(talloc_tos(), "?obj %s '%s'",
sparqlAttr,
p->sparql_type);
if (result == NULL) {
return NULL;
}
return result;
}
static const char *map_expr(const char *attr, char op, const char *val)
{
struct sparql_parser_state *s = global_sparql_parser_state;
int result = 0;
char *sparql = NULL;
const struct sl_attr_map *p;
time_t t;
struct tm *tmp;
char buf1[64];
char *q;
const char *start;
if (s->var == 'z') {
return NULL;
}
p = sl_attr_map_by_spotlight(attr);
if (p == NULL) {
return NULL;
}
if ((p->type != ssmt_type) && (p->sparql_attr == NULL)) {
yyerror("unsupported Spotlight attribute");
return NULL;
}
switch (p->type) {
case ssmt_bool:
sparql = talloc_asprintf(talloc_tos(), "?obj %s '%s'",
p->sparql_attr, val);
if (sparql == NULL) {
return NULL;
}
break;
case ssmt_num:
sparql = talloc_asprintf(talloc_tos(),
"?obj %s ?%c FILTER(?%c %c%c '%s')",
p->sparql_attr,
s->var,
s->var,
op,
/* append '=' to '!' */
op == '!' ? '=' : ' ',
val);
if (sparql == NULL) {
return NULL;
}
s->var++;
break;
case ssmt_str:
q = talloc_strdup(talloc_tos(), "");
if (q == NULL) {
return NULL;
}
start = val;
while (*val) {
if (*val != '*') {
val++;
continue;
}
if (val > start) {
q = talloc_strndup_append(q, start, val - start);
if (q == NULL) {
return NULL;
}
}
q = talloc_strdup_append(q, ".*");
if (q == NULL) {
return NULL;
}
val++;
start = val;
}
if (val > start) {
q = talloc_strndup_append(q, start, val - start);
if (q == NULL) {
return NULL;
}
}
sparql = talloc_asprintf(talloc_tos(),
"?obj %s ?%c "
"FILTER(regex(?%c, '^%s$', 'i'))",
p->sparql_attr,
s->var,
s->var,
q);
TALLOC_FREE(q);
if (sparql == NULL) {
return NULL;
}
s->var++;
break;
case ssmt_fts:
sparql = talloc_asprintf(talloc_tos(), "?obj %s '%s'",
p->sparql_attr, val);
if (sparql == NULL) {
return NULL;
}
break;
case ssmt_date:
t = atoi(val) + SPRAW_TIME_OFFSET;
tmp = localtime(&t);
if (tmp == NULL) {
return NULL;
}
result = strftime(buf1, sizeof(buf1),
"%Y-%m-%dT%H:%M:%SZ", tmp);
if (result == 0) {
return NULL;
}
sparql = talloc_asprintf(talloc_tos(),
"?obj %s ?%c FILTER(?%c %c '%s')",
p->sparql_attr,
s->var,
s->var,
op,
buf1);
if (sparql == NULL) {
return NULL;
}
s->var++;
break;
case ssmt_type:
sparql = map_type_search(attr, op, val);
if (sparql == NULL) {
return NULL;
}
break;
default:
return NULL;
}
return sparql;
}
void mdsyyerror(const char *str)
{
DEBUG(1, ("mdsyyerror: %s\n", str));
}
int mdsyywrap(void)
{
return 1;
}
/**
* Map a Spotlight RAW query string to a SPARQL query string
**/
bool map_spotlight_to_sparql_query(struct sl_query *slq)
{
struct sl_tracker_query *tq = talloc_get_type_abort(
slq->backend_private, struct sl_tracker_query);
struct sparql_parser_state s = {
.frame = talloc_stackframe(),
.var = 'a',
};
int result;
s.s = mdsyy_scan_string(slq->query_string);
if (s.s == NULL) {
TALLOC_FREE(s.frame);
return false;
}
global_sparql_parser_state = &s;
result = mdsyyparse();
global_sparql_parser_state = NULL;
mdsyy_delete_buffer(s.s);
if (result != 0) {
TALLOC_FREE(s.frame);
return false;
}
tq->sparql_query = talloc_asprintf(slq,
"SELECT ?url WHERE { %s . ?obj nie:url ?url . "
"FILTER(tracker:uri-is-descendant('file://%s/', ?url)) }",
s.result, tq->path_scope);
TALLOC_FREE(s.frame);
if (tq->sparql_query == NULL) {
return false;
}
return true;
}
|