Make functions that create and return, remove the temporary dir.

src/cgi.cpp

@@ -15,6 +15,7 @@
  */
 
 #include "cgi.hpp"
+#include "files.hpp"
 #include "fs-compat.hpp"
 
 #include <cgicc/Cgicc.h>
@@ -61,14 +62,8 @@ entry_type parse_formdata()
             {
                 throw runtime_error{"Filesize too big"};
             }
-            string filepath{fs::temp_directory_path()
-                            / "fediblock-backend-XXXXXX"};
-            if (mkstemp(&filepath[0]) == -1) // mkstemp() modifies filepath.
-            {
-                throw runtime_error{"Could not open temporary file: "
-                                    + filepath};
-            }
 
+            string filepath{get_tmpdir() / screenshot->getFilename()};
             ofstream file{filepath, ios::binary};
             if (file.good())
             {

src/files.cpp

@@ -0,0 +1,58 @@
+/*  This file is part of FediBlock-backend.
+ *  Copyright © 2020 tastytea <tastytea@tastytea.de>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, version 3.
+ *
+ *  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 Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "files.hpp"
+#include "fs-compat.hpp"
+
+#include <cstdint>
+#include <cstdlib>
+#include <stdexcept>
+#include <string>
+
+namespace FediBlock
+{
+
+using std::runtime_error;
+using std::string;
+using std::uintmax_t;
+
+string _tmpdir;
+
+fs::path get_tmpdir()
+{
+    if (_tmpdir.empty())
+    {
+        _tmpdir = fs::temp_directory_path() / "fediblock-backend-XXXXXX";
+        if (mkdtemp(&_tmpdir[0]) == nullptr) // mkdtemp() modifies _tmpdir.
+        {
+            throw runtime_error{"Could not create temporary directory: "
+                                + _tmpdir};
+        }
+    }
+
+    return _tmpdir;
+}
+
+void remove_tmpdir()
+{
+    if (fs::remove_all(get_tmpdir()) == static_cast<uintmax_t>(-1))
+    {
+        throw runtime_error{"Couldn't remove temporary directory: "
+                            + get_tmpdir().string()};
+    }
+}
+
+} // namespace FediBlock

src/files.hpp

@@ -0,0 +1,33 @@
+/*  This file is part of FediBlock-backend.
+ *  Copyright © 2020 tastytea <tastytea@tastytea.de>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, version 3.
+ *
+ *  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 Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef FEDIBLOCK_BACKEND_FILES_HPP
+#define FEDIBLOCK_BACKEND_FILES_HPP
+
+#include "fs-compat.hpp"
+
+namespace FediBlock
+{
+
+// Creates and returns the temporary directory.
+[[nodiscard]] fs::path get_tmpdir();
+
+// Remove the temporary directory. Throws runtime_error on error.
+void remove_tmpdir();
+
+} // namespace FediBlock
+
+#endif // FEDIBLOCK_BACKEND_FILES_HPP

src/main.cpp

@@ -15,12 +15,16 @@
  */
 
 #include "cgi.hpp"
+#include "files.hpp"
 #include "fs-compat.hpp"
 #include "json.hpp"
 
+#include <exception>
 #include <iostream>
 
+using std::cerr;
 using std::cout;
+using std::exception;
 
 using namespace FediBlock;
 
@@ -57,7 +61,14 @@ int main()
 
     print_debug(entry);
 
-    fs::remove(entry.screenshot_filepath);
+    try
+    {
+        remove_tmpdir();
+    }
+    catch (const exception &e)
+    {
+        cerr << e.what() << '\n';
+    }
 
     return 0;
 }