add change user data endpoint and in web

src/users/change_user.cpp

@@ -0,0 +1,80 @@
+#include "users.hpp"
+
+void change_user(const httplib::Request& request, httplib::Response& response) {
+    if (request.body == "") {response.set_content(
+        "{\"required\":\"[token] or if you superuser [token,userid]\",\"optional\":\"[username,password,is_superuser,group]\"}", 
+        "application/json"
+    );return;}
+    nlohmann::json json_body = nlohmann::json::parse(request.body);
+
+    if (json_body["token"] == nullptr) {response.set_content(
+        "{\"required\":\"[token] or if you superuser [token,userid]\",\"optional\":\"[username,password,is_superuser,group]\"}", 
+        "application/json"
+    );return;}
+    if ((json_body["userid"] == nullptr) && (json_body["old_password"] == nullptr)) {
+        response.set_content("{\"required\":\"[token] or if you superuser [token,userid]\",\"optional\":\"[username,password,is_superuser,group]\"}", "application/json");
+        return;
+    }
+    // if (json_body["new_password"] == nullptr) {response.set_content("{\"required\":\"[token] or if you superuser [token,userid]\"}", "application/json");return;}
+    if (!verify_auth(json_body["token"])) {response.set_content("{\"status\":\"403\"}", "application/json");return;}
+
+    // std::string old_password = "";
+    // const std::string new_password = json_body["new_password"];
+
+    // if (json_body["userid"] == nullptr) {old_password = json_body["old_password"];}
+
+    jwt::decoded_jwt<jwt::traits::kazuho_picojson> decoded_token = jwt::decode(json_body["token"]);
+    std::string userid = "";
+    for (auto& e : decoded_token.get_payload_json()) {
+        if (e.first == "userId") {
+            userid = e.second.to_str();
+            break;
+        }
+    }
+    if (userid == "") {response.set_content("{\"status\":\"403\"}", "application/json");return;}
+
+    std::ifstream usersfile("users.json");
+    nlohmann::json all_users = nlohmann::json::parse(usersfile);
+    usersfile.close();
+
+    std::string changeusruserid = userid;
+    if (json_body["userid"] != nullptr) {
+        changeusruserid = json_body["userid"];
+        nlohmann::json response_user_data = nullptr;
+        for (nlohmann::json& user : all_users) {
+            if (user["id"] == userid) {
+                response_user_data = user;
+            }
+        }
+        if (response_user_data == nullptr) {response.set_content("{\"status\":\"403\"}", "application/json");return;}
+        if (response_user_data["is_superuser"] != "1") {response.set_content("{\"status\":\"403\"}", "application/json");return;}
+    }
+
+    bool found = false;
+    if (json_body["userid"] != nullptr) {
+        for (int i = 0; i < all_users.size(); i++) {
+            if ((all_users[i]["id"] == changeusruserid)) {
+                if (json_body["username"] != nullptr) {all_users[i]["username"] = json_body["username"];}
+                if (json_body["password"] != nullptr) {all_users[i]["password"] = json_body["password"];}
+                if (json_body["group"] != nullptr) {all_users[i]["group"] = json_body["group"];}
+                if (json_body["is_superuser"] != nullptr) {all_users[i]["is_superuser"] = json_body["is_superuser"];}
+                found = true;
+                break;
+            }
+        }
+    } else {
+        for (int i = 0; i < all_users.size(); i++) {
+            if ((all_users[i]["id"] == changeusruserid)) {
+                if (json_body["username"] != nullptr) {all_users[i]["username"] = json_body["username"];}
+                found = true;
+                break;
+            }
+        }
+    }
+    if (!found) {response.set_content("{\"status\":\"can't find this user\"}", "application/json");return;}
+    std::ofstream usersfilew("users.json");
+    usersfilew << all_users.dump(4);
+    usersfilew.close();
+    response.set_content("{\"status\":\"ok\"}", "application/json");
+}
+