tests: add httpcommon tests and add new file_handler methods (#2712)

Co-authored-by: Mariotaku <mariotaku.lee@gmail.com>

src/file_handler.cpp

@@ -12,6 +12,37 @@
 #include "logging.h"
 
 namespace file_handler {
+  /**
+   * @breif Get the parent directory of a file or directory.
+   * @param path The path of the file or directory.
+   * @return `std::string` : The parent directory.
+   */
+  std::string
+  get_parent_directory(const std::string &path) {
+    // remove any trailing path separators
+    std::string trimmed_path = path;
+    while (!trimmed_path.empty() && trimmed_path.back() == '/') {
+      trimmed_path.pop_back();
+    }
+
+    std::filesystem::path p(trimmed_path);
+    return p.parent_path().string();
+  }
+
+  /**
+   * @brief Make a directory.
+   * @param path The path of the directory.
+   * @return `bool` : `true` on success, `false` on failure.
+   */
+  bool
+  make_directory(const std::string &path) {
+    // first, check if the directory already exists
+    if (std::filesystem::exists(path)) {
+      return true;
+    }
+
+    return std::filesystem::create_directories(path);
+  }
 
   /**
    * @brief Read a file to string.