test(chat): reproduce invalid JSON for a signed channel name

tests/Makefile.am

@@ -304,6 +304,7 @@ check_PROGRAMS += test_chat_setting
 check_PROGRAMS += test_chat_channel
 check_PROGRAMS += test_group_avatar_sql
 check_PROGRAMS += test_chat_member
+check_PROGRAMS += test_chat_json
 check_PROGRAMS += test_instance_contract
 test_instance_contract_SOURCES = test_instance_contract.c
 test_instance_contract_LDADD = $(LIBUTUN) $(COMMON_LIBS)
@@ -331,6 +332,8 @@ test_chat_member_LDADD = $(LIBUTUN) $(COMMON_LIBS)
 test_chat_member_LDFLAGS = -Wl,--wrap=sqlite3_finalize -Wl,--wrap=sqlite3_prepare_v2 -Wl,--wrap=sqlite3_bind_int64 \
     -Wl,--wrap=sqlite3_bind_int -Wl,--wrap=sqlite3_step -Wl,--wrap=sqlite3_changes -Wl,--wrap=sqlite3_exec \
     -Wl,--wrap=u_malloc_impl -Wl,--wrap=u_realloc_impl
+test_chat_json_SOURCES = test_chat_json.c
+test_chat_json_LDADD = $(LIBUTUN) $(COMMON_LIBS)
 else
 test_socket_monitor_LDFLAGS += -Wl,--wrap=read
 endif

tests/test_chat_json.c

@@ -0,0 +1,25 @@
+/* JSON introspection: допустимое имя канала возвращается без потери байтов и с полным escaping. */
+#include "../src/utun_instance.h"
+#include "../src/chat/chat_core.h"
+#include "../lib/debug_config.h"
+#include "../lib/mem.h"
+#include <assert.h>
+#include <string.h>
+
+int main(void) {
+    debug_config_init(); debug_set_level(DEBUG_LEVEL_ERROR); size_t baseline = u_get_allocated_count();
+    utun_instance_set_tun_init_enabled(0); struct UASYNC* ua = uasync_create(); assert(ua);
+    struct UTUN_INSTANCE* inst = utun_instance_create_from_str(ua,
+        "[ntp]\nenabled=no\n[chatserver]\ngroup_autoconnect=0\nstorage_autoload=0\n");
+    assert(inst && !utun_core_start(inst) && !chat_service_start(inst));
+    const char name[] = "Канал \x01 \"\\\n";
+    assert(chat_core_create_channel_auto(inst, name));
+    char json[4096]; size_t size = 0; assert(!chat_core_get_channels_json(inst, json, sizeof(json), &size));
+    sqlite3_stmt* st = NULL;
+    assert(sqlite3_prepare_v2(inst->topo_sqlite_db, "SELECT json_valid(?)", -1, &st, NULL) == SQLITE_OK);
+    assert(sqlite3_bind_text(st, 1, json, (int)size, SQLITE_STATIC) == SQLITE_OK && sqlite3_step(st) == SQLITE_ROW);
+    int valid = sqlite3_column_int(st, 0); assert(sqlite3_finalize(st) == SQLITE_OK);
+    DEBUG_ERROR(DEBUG_CATEGORY_CHAT_SYNC, "JSON test: channel name with ASCII01 valid=%d bytes=%zu", valid, size); assert(valid);
+    utun_instance_destroy(inst); uasync_poll(ua, 0); uasync_destroy(ua, 0); assert(u_get_allocated_count() == baseline);
+    return 0;
+}