utils: add json_utils

Add parseJson function to simplify json parsing:
* automatically log parsing failure
* allows single-line json parsing
* take a string_view instead of begin/end pointers
* optimize building the CharReader by reusing the CharReaderBuilder

Change-Id: I332a88fc476ee84ba400a96bc1b41515cca43c32

src/json_utils.h

@@ -0,0 +1,40 @@
+/*
+ *  Copyright (C) 2004-2024 Savoir-faire Linux Inc.
+ *
+ *  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 <https://www.gnu.org/licenses/>.
+ */
+#pragma once
+
+#include <string_view>
+#include <json/json.h>
+#include <logger.h>
+
+namespace jami {
+
+extern const Json::CharReaderBuilder rbuilder;
+
+inline bool parseJson(std::string_view jsonStr, Json::Value& json) {
+    std::string err;
+    auto reader = std::unique_ptr<Json::CharReader>(rbuilder.newCharReader());
+    if (!reader->parse(jsonStr.data(),
+                       jsonStr.data() + jsonStr.size(),
+                       &json,
+                       &err)) {
+        JAMI_WARNING("Can't parse JSON: {}\n{}", err, jsonStr);
+        return false;
+    }
+    return true;
+}
+
+}

src/string_utils.cpp

@@ -39,8 +39,19 @@
 
 #include <ciso646> // fix windows compiler bug
 
+#include "json_utils.h"
+
 namespace jami {
 
+Json::CharReaderBuilder getJsonReaderBuilder()
+{
+    Json::CharReaderBuilder builder;
+    builder["collectComments"] = false;
+    return builder;
+}
+
+const Json::CharReaderBuilder rbuilder = getJsonReaderBuilder();
+
 std::string_view
 userAgent()
 {