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filter: add lua support

Selaa lähdekoodia 
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld
2014-01-13 14:18:51 +01:00
vanhempi e83b51b4f6
commit f43b228d0b
4 muutettua tiedostoa jossa 235 lisäystä ja 3 poistoa
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186
filter.c
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@ -7,12 +7,19 @@
*/
#include "cgit.h"
#include "html.h"
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <dlfcn.h>
#include <errno.h>
#ifndef NO_LUA
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
#endif
static ssize_t (*libc_write)(int fd, const void *buf, size_t count);
static ssize_t (*filter_write)(struct cgit_filter *base, const void *buf, size_t count) = NULL;
@ -164,6 +171,182 @@ void cgit_exec_filter_init(struct cgit_exec_filter *filter, char *cmd, char **ar
filter->base.argument_count = 0;
}
#ifndef NO_LUA
struct lua_filter {
struct cgit_filter base;
char *script_file;
lua_State *lua_state;
};
static void error_lua_filter(struct lua_filter *filter)
{
die("Lua error in %s: %s", filter->script_file, lua_tostring(filter->lua_state, -1));
lua_pop(filter->lua_state, 1);
}
static ssize_t write_lua_filter(struct cgit_filter *base, const void *buf, size_t count)
{
struct lua_filter *filter = (struct lua_filter *) base;
lua_getglobal(filter->lua_state, "filter_write");
lua_pushlstring(filter->lua_state, buf, count);
if (lua_pcall(filter->lua_state, 1, 0, 0)) {
error_lua_filter(filter);
errno = EIO;
return -1;
}
return count;
}
static inline int hook_lua_filter(lua_State *lua_state, void (*fn)(const char *txt))
{
const char *str;
ssize_t (*save_filter_write)(struct cgit_filter *base, const void *buf, size_t count);
struct cgit_filter *save_filter;
str = lua_tostring(lua_state, 1);
if (!str)
return 0;
save_filter_write = filter_write;
save_filter = current_write_filter;
unhook_write();
fn(str);
hook_write(save_filter, save_filter_write);
return 0;
}
static int html_lua_filter(lua_State *lua_state)
{
return hook_lua_filter(lua_state, html);
}
static int html_txt_lua_filter(lua_State *lua_state)
{
return hook_lua_filter(lua_state, html_txt);
}
static int html_attr_lua_filter(lua_State *lua_state)
{
return hook_lua_filter(lua_state, html_attr);
}
static int html_url_path_lua_filter(lua_State *lua_state)
{
return hook_lua_filter(lua_state, html_url_path);
}
static int html_url_arg_lua_filter(lua_State *lua_state)
{
return hook_lua_filter(lua_state, html_url_arg);
}
static void cleanup_lua_filter(struct cgit_filter *base)
{
struct lua_filter *filter = (struct lua_filter *) base;
if (!filter->lua_state)
return;
lua_close(filter->lua_state);
filter->lua_state = NULL;
if (filter->script_file) {
free(filter->script_file);
filter->script_file = NULL;
}
}
static int init_lua_filter(struct lua_filter *filter)
{
if (filter->lua_state)
return 0;
if (!(filter->lua_state = luaL_newstate()))
return 1;
luaL_openlibs(filter->lua_state);
lua_pushcfunction(filter->lua_state, html_lua_filter);
lua_setglobal(filter->lua_state, "html");
lua_pushcfunction(filter->lua_state, html_txt_lua_filter);
lua_setglobal(filter->lua_state, "html_txt");
lua_pushcfunction(filter->lua_state, html_attr_lua_filter);
lua_setglobal(filter->lua_state, "html_attr");
lua_pushcfunction(filter->lua_state, html_url_path_lua_filter);
lua_setglobal(filter->lua_state, "html_url_path");
lua_pushcfunction(filter->lua_state, html_url_arg_lua_filter);
lua_setglobal(filter->lua_state, "html_url_arg");
if (luaL_dofile(filter->lua_state, filter->script_file)) {
error_lua_filter(filter);
lua_close(filter->lua_state);
filter->lua_state = NULL;
return 1;
}
return 0;
}
static int open_lua_filter(struct cgit_filter *base, va_list ap)
{
struct lua_filter *filter = (struct lua_filter *) base;
int i;
if (init_lua_filter(filter))
return 1;
hook_write(base, write_lua_filter);
lua_getglobal(filter->lua_state, "filter_open");
for (i = 0; i < filter->base.argument_count; ++i)
lua_pushstring(filter->lua_state, va_arg(ap, char *));
if (lua_pcall(filter->lua_state, filter->base.argument_count, 0, 0)) {
error_lua_filter(filter);
return 1;
}
return 0;
}
static int close_lua_filter(struct cgit_filter *base)
{
struct lua_filter *filter = (struct lua_filter *) base;
int ret = 0;
lua_getglobal(filter->lua_state, "filter_close");
if (lua_pcall(filter->lua_state, 0, 0, 0)) {
error_lua_filter(filter);
ret = 1;
}
unhook_write();
return ret;
}
static void fprintf_lua_filter(struct cgit_filter *base, FILE *f, const char *prefix)
{
struct lua_filter *filter = (struct lua_filter *) base;
fprintf(f, "%slua:%s\n", prefix, filter->script_file);
}
static struct cgit_filter *new_lua_filter(const char *cmd, int argument_count)
{
struct lua_filter *filter;
filter = xmalloc(sizeof(*filter));
memset(filter, 0, sizeof(*filter));
filter->base.open = open_lua_filter;
filter->base.close = close_lua_filter;
filter->base.fprintf = fprintf_lua_filter;
filter->base.cleanup = cleanup_lua_filter;
filter->base.argument_count = argument_count;
filter->script_file = xstrdup(cmd);
return &filter->base;
}
#endif
int cgit_open_filter(struct cgit_filter *filter, ...)
{
int result;
@ -191,6 +374,9 @@ static const struct {
struct cgit_filter *(*ctor)(const char *cmd, int argument_count);
} filter_specs[] = {
{ "exec", new_exec_filter },
#ifndef NO_LUA
{ "lua", new_lua_filter },
#endif
};
struct cgit_filter *cgit_new_filter(const char *cmd, filter_type filtertype)