+#ifdef NO_LUA
+void cgit_init_filters(void)
+{
+}
+#endif
+
+#ifndef NO_LUA
+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;
+static struct cgit_filter *current_write_filter = NULL;
+
+void cgit_init_filters(void)
+{
+ libc_write = dlsym(RTLD_NEXT, "write");
+ if (!libc_write)
+ die("Could not locate libc's write function");
+}
+
+ssize_t write(int fd, const void *buf, size_t count)
+{
+ if (fd != STDOUT_FILENO || !filter_write)
+ return libc_write(fd, buf, count);
+ return filter_write(current_write_filter, buf, count);
+}
+
+static inline void hook_write(struct cgit_filter *filter, ssize_t (*new_write)(struct cgit_filter *base, const void *buf, size_t count))
+{
+ /* We want to avoid buggy nested patterns. */
+ assert(filter_write == NULL);
+ assert(current_write_filter == NULL);
+ current_write_filter = filter;
+ filter_write = new_write;
+}
+
+static inline void unhook_write(void)
+{
+ assert(filter_write != NULL);
+ assert(current_write_filter != NULL);
+ filter_write = NULL;
+ current_write_filter = NULL;
+}
+
+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 int html_include_lua_filter(lua_State *lua_state)
+{
+ return hook_lua_filter(lua_state, (void (*)(const char *))html_include);
+}
+
+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");
+ lua_pushcfunction(filter->lua_state, html_include_lua_filter);
+ lua_setglobal(filter->lua_state, "html_include");
+
+ 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, 1, 0)) {
+ error_lua_filter(filter);
+ ret = -1;
+ } else {
+ ret = lua_tonumber(filter->lua_state, -1);
+ lua_pop(filter->lua_state, 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
+
+
git.ckatri.com / cgit.git / blobdiff