filter: add lua support
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Tento commit je obsažen v:
Jason A. Donenfeld
rodič
e83b51b4f6
revize
f43b228d0b
1
README
1
README
@ -38,6 +38,7 @@ Dependencies
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* libzip
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* libcrypto (OpenSSL)
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* libssl (OpenSSL)
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* optional: luajit or lua
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Apache configuration
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--------------------
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22
cgit.mk
22
cgit.mk
@ -25,6 +25,25 @@ ifdef NO_C99_FORMAT
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CFLAGS += -DNO_C99_FORMAT
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endif
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ifdef NO_LUA
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CFLAGS += -DNO_LUA
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else
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ifeq (VANILLA,$(LUA_IMPLEMENTATION))
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CFLAGS += -llua
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else
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LUAJIT_LIBS := $(shell pkg-config --libs luajit)
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LUAJIT_CFLAGS := $(shell pkg-config --cflags luajit)
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CGIT_LIBS += $(LUAJIT_LIBS)
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CFLAGS += $(LUAJIT_CFLAGS)
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endif
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endif
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CGIT_LIBS += -ldl
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CGIT_OBJ_NAMES += cgit.o
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CGIT_OBJ_NAMES += cache.o
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CGIT_OBJ_NAMES += cmd.o
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@ -61,9 +80,6 @@ $(CGIT_VERSION_OBJS): $(CGIT_PREFIX)VERSION
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$(CGIT_VERSION_OBJS): EXTRA_CPPFLAGS = \
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-DCGIT_VERSION='"$(CGIT_VERSION)"'
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CGIT_LIBS += -ldl
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# Git handles dependencies using ":=" so dependencies in CGIT_OBJ are not
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# handled by that and we must handle them ourselves.
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cgit_dep_files := $(foreach f,$(CGIT_OBJS),$(dir $f).depend/$(notdir $f).d)
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29
cgitrc.5.txt
29
cgitrc.5.txt
@ -564,6 +564,35 @@ specification with the relevant string; available values are:
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'exec:'::
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The default "one process per filter" mode.
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'lua:'::
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Executes the script using a built-in Lua interpreter. The script is
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loaded once per execution of cgit, and may be called multiple times
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during cgit's lifetime, making it a good choice for repeated filters
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such as the 'email filter'. It responds to three functions:
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'filter_open(argument1, argument2, argument3, ...)'::
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This is called upon activation of the filter for a particular
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set of data.
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'filter_write(buffer)'::
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This is called whenever cgit writes data to the webpage.
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'filter_close()'::
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This is called when the current filtering operation is
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completed.
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Additionally, cgit exposes to the Lua the following built-in functions:
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'html(str)'::
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Writes 'str' to the webpage.
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'html_txt(str)'::
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HTML escapes and writes 'str' to the webpage.
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'html_attr(str)'::
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HTML escapes for an attribute and writes "str' to the webpage.
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'html_url_path(str)'::
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URL escapes for a path and writes 'str' to the webpage.
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'html_url_arg(str)'::
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URL escapes for an argument and writes 'str' to the webpage.
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Parameters are provided to filters as follows.
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about filter::
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186
filter.c
186
filter.c
@ -7,12 +7,19 @@
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*/
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#include "cgit.h"
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#include "html.h"
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <dlfcn.h>
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#include <errno.h>
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#ifndef NO_LUA
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#include <lua.h>
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#include <lualib.h>
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#include <lauxlib.h>
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#endif
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static ssize_t (*libc_write)(int fd, const void *buf, size_t count);
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static ssize_t (*filter_write)(struct cgit_filter *base, const void *buf, size_t count) = NULL;
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@ -164,6 +171,182 @@ void cgit_exec_filter_init(struct cgit_exec_filter *filter, char *cmd, char **ar
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filter->base.argument_count = 0;
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}
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#ifndef NO_LUA
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struct lua_filter {
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struct cgit_filter base;
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char *script_file;
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lua_State *lua_state;
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};
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static void error_lua_filter(struct lua_filter *filter)
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{
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die("Lua error in %s: %s", filter->script_file, lua_tostring(filter->lua_state, -1));
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lua_pop(filter->lua_state, 1);
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}
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static ssize_t write_lua_filter(struct cgit_filter *base, const void *buf, size_t count)
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{
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struct lua_filter *filter = (struct lua_filter *) base;
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lua_getglobal(filter->lua_state, "filter_write");
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lua_pushlstring(filter->lua_state, buf, count);
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if (lua_pcall(filter->lua_state, 1, 0, 0)) {
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error_lua_filter(filter);
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errno = EIO;
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return -1;
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}
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return count;
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}
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static inline int hook_lua_filter(lua_State *lua_state, void (*fn)(const char *txt))
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{
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const char *str;
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ssize_t (*save_filter_write)(struct cgit_filter *base, const void *buf, size_t count);
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struct cgit_filter *save_filter;
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str = lua_tostring(lua_state, 1);
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if (!str)
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return 0;
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save_filter_write = filter_write;
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save_filter = current_write_filter;
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unhook_write();
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fn(str);
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hook_write(save_filter, save_filter_write);
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return 0;
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}
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static int html_lua_filter(lua_State *lua_state)
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{
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return hook_lua_filter(lua_state, html);
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}
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static int html_txt_lua_filter(lua_State *lua_state)
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{
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return hook_lua_filter(lua_state, html_txt);
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}
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static int html_attr_lua_filter(lua_State *lua_state)
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{
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return hook_lua_filter(lua_state, html_attr);
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}
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static int html_url_path_lua_filter(lua_State *lua_state)
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{
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return hook_lua_filter(lua_state, html_url_path);
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}
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static int html_url_arg_lua_filter(lua_State *lua_state)
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{
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return hook_lua_filter(lua_state, html_url_arg);
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}
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static void cleanup_lua_filter(struct cgit_filter *base)
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{
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struct lua_filter *filter = (struct lua_filter *) base;
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if (!filter->lua_state)
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return;
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lua_close(filter->lua_state);
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filter->lua_state = NULL;
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if (filter->script_file) {
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free(filter->script_file);
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filter->script_file = NULL;
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}
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}
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static int init_lua_filter(struct lua_filter *filter)
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{
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if (filter->lua_state)
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return 0;
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if (!(filter->lua_state = luaL_newstate()))
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return 1;
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luaL_openlibs(filter->lua_state);
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lua_pushcfunction(filter->lua_state, html_lua_filter);
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lua_setglobal(filter->lua_state, "html");
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lua_pushcfunction(filter->lua_state, html_txt_lua_filter);
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lua_setglobal(filter->lua_state, "html_txt");
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lua_pushcfunction(filter->lua_state, html_attr_lua_filter);
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lua_setglobal(filter->lua_state, "html_attr");
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lua_pushcfunction(filter->lua_state, html_url_path_lua_filter);
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lua_setglobal(filter->lua_state, "html_url_path");
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lua_pushcfunction(filter->lua_state, html_url_arg_lua_filter);
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lua_setglobal(filter->lua_state, "html_url_arg");
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if (luaL_dofile(filter->lua_state, filter->script_file)) {
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error_lua_filter(filter);
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lua_close(filter->lua_state);
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filter->lua_state = NULL;
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return 1;
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}
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return 0;
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}
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static int open_lua_filter(struct cgit_filter *base, va_list ap)
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{
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struct lua_filter *filter = (struct lua_filter *) base;
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int i;
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if (init_lua_filter(filter))
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return 1;
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hook_write(base, write_lua_filter);
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lua_getglobal(filter->lua_state, "filter_open");
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for (i = 0; i < filter->base.argument_count; ++i)
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lua_pushstring(filter->lua_state, va_arg(ap, char *));
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if (lua_pcall(filter->lua_state, filter->base.argument_count, 0, 0)) {
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error_lua_filter(filter);
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return 1;
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}
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return 0;
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}
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static int close_lua_filter(struct cgit_filter *base)
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{
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struct lua_filter *filter = (struct lua_filter *) base;
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int ret = 0;
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lua_getglobal(filter->lua_state, "filter_close");
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if (lua_pcall(filter->lua_state, 0, 0, 0)) {
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error_lua_filter(filter);
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ret = 1;
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}
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unhook_write();
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return ret;
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}
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static void fprintf_lua_filter(struct cgit_filter *base, FILE *f, const char *prefix)
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{
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struct lua_filter *filter = (struct lua_filter *) base;
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fprintf(f, "%slua:%s\n", prefix, filter->script_file);
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}
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static struct cgit_filter *new_lua_filter(const char *cmd, int argument_count)
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{
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struct lua_filter *filter;
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filter = xmalloc(sizeof(*filter));
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memset(filter, 0, sizeof(*filter));
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filter->base.open = open_lua_filter;
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filter->base.close = close_lua_filter;
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filter->base.fprintf = fprintf_lua_filter;
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filter->base.cleanup = cleanup_lua_filter;
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filter->base.argument_count = argument_count;
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filter->script_file = xstrdup(cmd);
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return &filter->base;
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}
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#endif
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int cgit_open_filter(struct cgit_filter *filter, ...)
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{
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int result;
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@ -191,6 +374,9 @@ static const struct {
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struct cgit_filter *(*ctor)(const char *cmd, int argument_count);
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} filter_specs[] = {
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{ "exec", new_exec_filter },
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#ifndef NO_LUA
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{ "lua", new_lua_filter },
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#endif
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};
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struct cgit_filter *cgit_new_filter(const char *cmd, filter_type filtertype)
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