添加问题处理模块，包含问题数据库操作和响应处理函数，支持问题的增删查改功能
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31
include/db/problems.h
Normal file
31
include/db/problems.h
Normal file
@ -0,0 +1,31 @@
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#ifndef DB_PROBLEMS_H
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#define DB_PROBLEMS_H
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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int open_problems_db();
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void close_problems_db();
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int add_problem(const char* problem, const char* answer, const char* check_error, int* result);
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int delete_problems(int problems_id);
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int get_problem(int id, char** result, char** result2, char** result3);
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int modify_problem(int problems_id, const char* problem, const char* answer, const char* check_error);
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int check_answer(int problems_id, const char* answer, int* result);
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int has_problem(int problems_id, int* result);
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int all_problems(char** result);
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#ifdef __cplusplus
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}
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#endif
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#endif // DB_PROBLEMS_H
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@ -7,8 +7,6 @@ void res_null_req(mg_connection* conn);
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void res_must_get(mg_connection* conn);
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void res_must_post(mg_connection* conn);
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void res_need_token(mg_connection* conn);
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void res_auth_fail(mg_connection* conn);
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void res_unauth(mg_connection* conn);
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void res_check_exist_fail(mg_connection* conn);
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void res_user_exist(mg_connection* conn);
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void res_not_exist(mg_connection* conn);
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@ -17,9 +15,10 @@ void res_need_user_id(mg_connection* conn);
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void res_need_password(mg_connection* conn);
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void res_need_action(mg_connection* conn);
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void res_bad_action(mg_connection* conn);
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void res_need_xxx(mg_connection* conn,const char* xxx);
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void res_(mg_connection* conn);
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void res_auth_fail(mg_connection* conn);
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void res_unauth(mg_connection* conn);
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void res_auth(mg_connection* conn);
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void res_delete_account_fail(mg_connection* conn);
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void res_delete_account(mg_connection* conn);
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@ -43,9 +42,15 @@ void res_permission(mg_connection* conn, int permission);
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void res_repermission_fail(mg_connection* conn);
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void res_repermission(mg_connection* conn);
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void res_(mg_connection* conn);
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void res_(mg_connection* conn);
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void res_(mg_connection* conn);
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void res_(mg_connection* conn);
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void res_need_xxx(mg_connection* conn, const char* xxx);
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void res_500(mg_connection* conn, const char* error);
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void res_404(mg_connection* conn, const char* error);
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void res_200(mg_connection* conn, const char* success);
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void res_add_problem(mg_connection* conn, int id);
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void res_query_problem(mg_connection* conn, const char* problem, const char* check_error);
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void res_query_problem2(mg_connection* conn, const char* problem, const char* answer, const char* check_error);
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void res_check_answer(mg_connection* conn, int flag);
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void res_all_problems(mg_connection* conn, const char* problems);
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#endif
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10
include/server/study.h
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10
include/server/study.h
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@ -0,0 +1,10 @@
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#ifndef SERVER_PROBLEMS_H
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#define SERVER_PROBLEMS_H
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#include "server/types.h"
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int problems_handler(mg_connection* conn, void* cbdata);
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extern char* secret;
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#endif // SERVER_PROBLEMS_H
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194
src/db/problems.cpp
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194
src/db/problems.cpp
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@ -0,0 +1,194 @@
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#include "problems.h"
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#include <print>
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#include <leveldb/db.h>
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#include <leveldb/write_batch.h>
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#include <nlohmann/json.hpp>
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#include <string>
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using leveldb_ptr = leveldb::DB*;
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auto problems_db = leveldb_ptr{nullptr};
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auto max_problem_id = 0;
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extern "C"
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{
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int open_problems_db()
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{
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auto opts = leveldb::Options{};
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opts.create_if_missing = true;
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auto status = leveldb::DB::Open(opts, "db/problems", &problems_db);
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if (!status.ok()) {
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std::println(stderr, "Failed to open problems database: {}", status.ToString());
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return 0;
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}
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auto value = std::string{};
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status = problems_db->Get(leveldb::ReadOptions{}, "@", &value);
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if (status.ok()) {
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auto json = nlohmann::json::parse(value);
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json["max_problem_id"].get_to(max_problem_id);
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} else if (status.IsNotFound()) {
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auto json = nlohmann::json{
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{"max_problem_id", 0}
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};
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status = problems_db->Put(leveldb::WriteOptions{}, "@", json.dump());
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return 1;
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} else {
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std::println(stderr, "Failed to get max problem id: {}", status.ToString());
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delete problems_db;
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return 0;
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}
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return 1;
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}
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void close_problems_db()
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{
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delete problems_db;
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}
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int add_problem(const char* problem, const char* answer, const char* check_error, int* result)
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{
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auto batch = leveldb::WriteBatch{};
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++max_problem_id;
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auto json = nlohmann::json{
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{"max_problem_id", max_problem_id}
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};
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batch.Put("@", json.dump());
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json = nlohmann::json{
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{"content", problem },
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{"answer", answer },
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{"error", check_error}
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};
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batch.Put(std::to_string(max_problem_id), json.dump());
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auto status = problems_db->Write(leveldb::WriteOptions{}, &batch);
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if (!status.ok()) {
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std::println(stderr, "Failed to add a problem: {}", status.ToString());
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return 0;
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}
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*result = max_problem_id;
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return 1;
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}
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int delete_problems(int problems_id)
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{
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auto batch = leveldb::WriteBatch{};
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auto status = problems_db->Delete(leveldb::WriteOptions{}, std::to_string(problems_id));
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if (!status.ok()) {
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std::println(stderr, "Failed to delete a problem: {}", status.ToString());
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return 0;
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}
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return 1;
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}
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int get_problem(int id, char** result1, char** result2, char** result3)
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{
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auto value = std::string{};
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auto status = problems_db->Get(leveldb::ReadOptions{}, std::to_string(id), &value);
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if (!status.ok()) {
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std::println(stderr, "Failed to get a problem: {}", status.ToString());
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return 0;
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}
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auto json = nlohmann::json::parse(value);
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if (result1) {
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json["content"].get_to(value);
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*result1 = strdup(value.data());
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}
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if (result2) {
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json["answer"].get_to(value);
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*result2 = strdup(value.data());
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}
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if (result3) {
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json["error"].get_to(value);
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*result3 = strdup(value.data());
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}
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return 1;
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}
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int modify_problem(int problems_id, const char* problem, const char* answer, const char* check_error)
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{
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auto json = nlohmann::json{
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{"content", problem },
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{"answer", answer },
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{"error", check_error}
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};
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auto status = problems_db->Put(leveldb::WriteOptions{}, std::to_string(problems_id), json.dump());
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if (!status.ok()) {
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std::println(stderr, "Failed to modify a problem: {}", status.ToString());
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return 0;
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}
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return 1;
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}
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int check_answer(int problems_id, const char* answer, int* result)
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{
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auto value = std::string{};
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auto status = problems_db->Get(leveldb::ReadOptions{}, std::to_string(problems_id), &value);
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if (!status.ok()) {
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std::println(stderr, "Failed to check the answer: {}", status.ToString());
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return 0;
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}
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auto value2 = std::string{};
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auto json = nlohmann::json::parse(value);
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json["answer"].get_to(value);
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json["error"].get_to(value2);
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if (value2.empty()) {
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*result = value == answer;
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} else {
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auto error = std::stod(value2);
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auto std_answer = std::stod(value);
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auto user_answer = std::stod(answer);
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*result = std::fabs(std_answer - user_answer) <= error;
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}
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return 1;
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}
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int has_problem(int problems_id, int* result)
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{
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auto value = std::string{};
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auto status = problems_db->Get(leveldb::ReadOptions{}, std::to_string(problems_id), &value);
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if (status.ok()) {
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*result = 1;
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} else if (status.IsNotFound()) {
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*result = 0;
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} else {
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std::println(stderr, "Failed to check problem existence: {}", status.ToString());
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return 0;
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}
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return 1;
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}
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int all_problems(char** result)
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{
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auto problems = std::vector<int>{};
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leveldb::Iterator* it = problems_db->NewIterator(leveldb::ReadOptions());
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for (it->SeekToFirst(); it->Valid(); it->Next()) {
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if (!it->key().compare("@")) continue;
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problems.emplace_back(std::stoi(it->key().ToString()));
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}
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if (!it->status().ok()) {
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std::println(stderr, "Failed to get all problems: {}", it->status().ToString());
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return 0;
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}
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auto json = nlohmann::json(problems);
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*result = strdup(json.dump().c_str());
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return 1;
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}
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}
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@ -99,11 +99,15 @@ void res_need_password(mg_connection* conn)
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"Access-Control-Allow-Origin: *\r\n\r\n"
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"{\"error\":\"need password\"}");
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}
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void res_(mg_connection* conn);
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void res_(mg_connection* conn);
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void res_(mg_connection* conn);
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void res_(mg_connection* conn);
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void res_auth(mg_connection* conn)
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{
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mg_printf(conn,
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"HTTP/1.1 200 OK\r\n"
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"Content-Type: application/json\r\n"
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"Access-Control-Allow-Origin: *\r\n\r\n"
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"{\"success\":\"auth\"}");
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}
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void res_delete_account_fail(mg_connection* conn)
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{
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@ -253,6 +257,36 @@ void res_need_xxx(mg_connection* conn, const char* xxx)
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xxx);
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}
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void res_500(mg_connection* conn, const char* error)
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{
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mg_printf(conn,
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"HTTP/1.1 400 Bad Request\r\n"
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"Content-Type: application/json\r\n"
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"Access-Control-Allow-Origin: *\r\n\r\n"
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"{\"error\":\"%s\"}",
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error);
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}
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void res_404(mg_connection* conn, const char* error)
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{
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mg_printf(conn,
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"HTTP/1.1 400 Bad Request\r\n"
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"Content-Type: application/json\r\n"
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"Access-Control-Allow-Origin: *\r\n\r\n"
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"{\"error\":\"%s\"}",
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error);
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}
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void res_200(mg_connection* conn, const char* success)
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{
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mg_printf(conn,
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"HTTP/1.1 200 OK\r\n"
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"Content-Type: application/json\r\n"
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"Access-Control-Allow-Origin: *\r\n\r\n"
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"{\"success\":\"%s\"}",
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success);
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}
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void res_auth_fail(mg_connection* conn)
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{
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mg_printf(conn,
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@ -261,3 +295,53 @@ void res_auth_fail(mg_connection* conn)
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"Access-Control-Allow-Origin: *\r\n\r\n"
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"{\"error\":\"failed to authorize\"}");
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}
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void res_add_problem(mg_connection* conn, int id)
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{
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mg_printf(conn,
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"HTTP/1.1 200 OK\r\n"
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"Content-Type: application/json\r\n"
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"Access-Control-Allow-Origin: *\r\n\r\n"
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"{\"success\":\"add problem success\", \"id\":%d}",
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id);
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}
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void res_query_problem(mg_connection* conn, const char* problem, const char* check_error)
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{
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mg_printf(conn,
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"HTTP/1.1 200 OK\r\n"
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"Content-Type: application/json\r\n"
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"Access-Control-Allow-Origin: *\r\n\r\n"
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"{\"success\":\"query problem success\", \"problem\":\"%s\", \"check_error\":%s}",
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problem,
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check_error);
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}
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void res_query_problem2(mg_connection* conn, const char* problem, const char* answer, const char* check_error)
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{
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mg_printf(conn,
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"HTTP/1.1 200 OK\r\n"
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"Content-Type: application/json\r\n"
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"Access-Control-Allow-Origin: *\r\n\r\n"
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"{\"success\":\"query problem success\", \"problem\":\"%s\",\"answer\":\"%s\", \"check_error\":%s}",
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problem,
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answer,
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check_error);
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}
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void res_check_answer(mg_connection* conn, int flag)
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{
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mg_printf(conn,
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"HTTP/1.1 200 OK\r\n"
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"Content-Type: application/json\r\n"
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"Access-Control-Allow-Origin: *\r\n\r\n"
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"{\"success\":\"success to check\", \"result\":%s}",
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flag ? "true" : "false");
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}
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void res_all_problems(mg_connection* conn, const char* problems)
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{
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mg_printf(conn,
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"HTTP/1.1 200 OK\r\n"
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"Content-Type: application/json\r\n"
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"Access-Control-Allow-Origin: *\r\n\r\n"
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"{\"success\":\"success to get all the problems\", \"result\":%s}",
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problems);
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}
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290
src/server/study/problems.c
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290
src/server/study/problems.c
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#include "db/problems.h"
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#include "jwt/jwt.h"
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#include "server/response.h"
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#include "server/study.h"
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#include "server/types.h"
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#include "server/util.h"
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#include "db/auth.h"
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#include "hash/hash.h"
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#include <civetweb.h>
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#include <cjson/cJSON.h>
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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typedef struct
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{
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char* action;
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char* token;
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int id;
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int has_id;
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char* problem;
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char* answer;
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char* error;
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} problem_form_t;
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static void problem_form_dtor(problem_form_t* form)
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{
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if (form->action) free(form->action);
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if (form->token) free(form->token);
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if (form->problem) free(form->problem);
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if (form->answer) free(form->answer);
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if (form->error) free(form->error);
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}
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static int field_found(const char* key, const char* filename, char* path, size_t pathlen, void* user_data)
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{
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return MG_FORM_FIELD_HANDLE_GET;
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}
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static int field_get(const char* key, const char* value, size_t valuelen, void* user_data)
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{
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problem_form_t* form = (problem_form_t*)user_data;
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if (strcmp(key, "action") == 0) {
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form->action = kqm_strndup(value, valuelen);
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} else if (strcmp(key, "token") == 0) {
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form->token = kqm_strndup(value, valuelen);
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} else if (strcmp(key, "id") == 0) {
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char* id_str = kqm_strndup(value, valuelen);
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form->id = atoi(id_str);
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form->has_id = 1;
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free(id_str);
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} else if (strcmp(key, "problem") == 0) {
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form->problem = kqm_strndup(value, valuelen);
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} else if (strcmp(key, "answer") == 0) {
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form->answer = kqm_strndup(value, valuelen);
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} else if (strcmp(key, "error") == 0) {
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form->error = kqm_strndup(value, valuelen);
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}
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return MG_FORM_FIELD_HANDLE_GET;
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}
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static void impl_add(mg_connection* conn, problem_form_t* form)
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{
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if (!form->problem) {
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res_need_xxx(conn, "problem content");
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return;
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}
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if (!form->answer) {
|
||||
res_need_xxx(conn, "standard answer");
|
||||
return;
|
||||
}
|
||||
if (!form->error) {
|
||||
res_need_xxx(conn, "checking error");
|
||||
return;
|
||||
}
|
||||
|
||||
int result;
|
||||
int flag = add_problem(form->problem, form->answer, form->error, &result);
|
||||
if (!flag) {
|
||||
res_500(conn, "failed to add a problem");
|
||||
return;
|
||||
}
|
||||
|
||||
res_add_problem(conn, result);
|
||||
}
|
||||
|
||||
static void impl_delete(mg_connection* conn, problem_form_t* form)
|
||||
{
|
||||
if (!form->has_id) {
|
||||
res_need_xxx(conn, "problem id");
|
||||
return;
|
||||
}
|
||||
|
||||
int result;
|
||||
if (!has_problem(form->id, &result)) {
|
||||
res_500(conn, "fail to check problem existence");
|
||||
return;
|
||||
} else if (!result) {
|
||||
res_404(conn, "problem do not exist");
|
||||
return;
|
||||
}
|
||||
|
||||
if (!delete_problems(form->id)) {
|
||||
res_500(conn, "fail to delete problem");
|
||||
return;
|
||||
}
|
||||
res_200(conn, "deleted");
|
||||
}
|
||||
|
||||
static void impl_query(mg_connection* conn, problem_form_t* form, int permission)
|
||||
{
|
||||
if (!form->has_id) {
|
||||
res_need_xxx(conn, "problem id");
|
||||
return;
|
||||
}
|
||||
|
||||
int result;
|
||||
if (!has_problem(form->id, &result)) {
|
||||
res_500(conn, "fail to check problem existence");
|
||||
return;
|
||||
} else if (!result) {
|
||||
res_404(conn, "problem do not exist");
|
||||
return;
|
||||
}
|
||||
|
||||
char* result1 = NULL;
|
||||
char* result2 = NULL;
|
||||
char* result3 = NULL;
|
||||
|
||||
char** pr2 = permission == 1 ? &result2 : NULL;
|
||||
if (!get_problem(form->id, &result1, pr2, &result3)) {
|
||||
res_500(conn, "fail to get problem");
|
||||
return;
|
||||
}
|
||||
if (pr2) {
|
||||
res_query_problem2(conn, result1, result2, result3);
|
||||
} else {
|
||||
res_query_problem(conn, result1, result3);
|
||||
}
|
||||
}
|
||||
|
||||
static void impl_modify(mg_connection* conn, problem_form_t* form)
|
||||
{
|
||||
if (!form->has_id) {
|
||||
res_need_xxx(conn, "problem id");
|
||||
return;
|
||||
}
|
||||
if (!form->problem) {
|
||||
res_need_xxx(conn, "problem content");
|
||||
return;
|
||||
}
|
||||
if (!form->answer) {
|
||||
res_need_xxx(conn, "standard answer");
|
||||
return;
|
||||
}
|
||||
if (!form->error) {
|
||||
res_need_xxx(conn, "checking error");
|
||||
return;
|
||||
}
|
||||
|
||||
int flag = modify_problem(form->id, form->problem, form->answer, form->error);
|
||||
if (!flag) {
|
||||
res_500(conn, "failed to modify the problem");
|
||||
return;
|
||||
}
|
||||
res_200(conn, "success to modify the problem");
|
||||
}
|
||||
|
||||
static void impl_check(mg_connection* conn, problem_form_t* form)
|
||||
{
|
||||
if (!form->has_id) {
|
||||
res_need_xxx(conn, "problem id");
|
||||
return;
|
||||
}
|
||||
if (!form->answer) {
|
||||
res_need_xxx(conn, "answer");
|
||||
return;
|
||||
}
|
||||
|
||||
int result;
|
||||
if (!has_problem(form->id, &result)) {
|
||||
res_500(conn, "fail to check problem existence");
|
||||
return;
|
||||
} else if (!result) {
|
||||
res_404(conn, "problem do not exist");
|
||||
return;
|
||||
}
|
||||
|
||||
int flag = check_answer(form->id, form->answer, &result);
|
||||
if (!flag) {
|
||||
res_500(conn, "fail to check the answer");
|
||||
return;
|
||||
}
|
||||
res_check_answer(conn, result);
|
||||
}
|
||||
|
||||
static void impl_all(mg_connection* conn, problem_form_t* form)
|
||||
{
|
||||
char* result = NULL;
|
||||
int flag = all_problems(&result);
|
||||
if (!flag) {
|
||||
res_500(conn, "fail to get all the problem");
|
||||
return;
|
||||
}
|
||||
res_all_problems(conn, result);
|
||||
}
|
||||
|
||||
int problems_handler(mg_connection* conn, void* cbdata)
|
||||
{
|
||||
const mg_request_info* post_body = mg_get_request_info(conn);
|
||||
|
||||
if (post_body == NULL) {
|
||||
res_null_req(conn);
|
||||
return 1;
|
||||
}
|
||||
|
||||
if (strcmp(post_body->request_method, "POST")) {
|
||||
res_must_post(conn);
|
||||
return 1;
|
||||
}
|
||||
|
||||
problem_form_t form = {NULL, NULL, 0, 0, NULL, NULL, NULL};
|
||||
|
||||
mg_form_data_handler problem_callback = {
|
||||
.field_found = field_found,
|
||||
.field_get = field_get,
|
||||
.field_store = NULL,
|
||||
.user_data = &form,
|
||||
};
|
||||
|
||||
mg_handle_form_request(conn, &problem_callback);
|
||||
|
||||
|
||||
if (!form.action) {
|
||||
res_need_action(conn);
|
||||
} else if (!form.token) {
|
||||
res_need_token(conn);
|
||||
} else {
|
||||
char* user_id = get_payload(form.token);
|
||||
int result;
|
||||
int flag = get_user_permission(user_id, &result);
|
||||
if (!flag) {
|
||||
res_check_permission_fail(conn);
|
||||
} else if (result != 1 && result != 2) {
|
||||
res_permission_denied(conn);
|
||||
} else {
|
||||
if (!strcmp(form.action, "add")) {
|
||||
if (result == 2) {
|
||||
res_permission_denied(conn);
|
||||
} else {
|
||||
impl_add(conn, &form);
|
||||
}
|
||||
} else if (!strcmp(form.action, "delete")) {
|
||||
if (result == 2) {
|
||||
res_permission_denied(conn);
|
||||
} else {
|
||||
impl_delete(conn, &form);
|
||||
}
|
||||
} else if (!strcmp(form.action, "query")) {
|
||||
impl_query(conn, &form, result);
|
||||
} else if (!strcmp(form.action, "modify")) {
|
||||
if (result == 2) {
|
||||
res_permission_denied(conn);
|
||||
} else {
|
||||
impl_modify(conn, &form);
|
||||
}
|
||||
} else if (!strcmp(form.action, "check")) {
|
||||
impl_check(conn, &form);
|
||||
} else if (!strcmp(form.action, "all")) {
|
||||
if (result == 2) {
|
||||
res_permission_denied(conn);
|
||||
} else {
|
||||
impl_all(conn, &form);
|
||||
}
|
||||
} else {
|
||||
res_bad_action(conn);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
problem_form_dtor(&form);
|
||||
return 1;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user