--- a/mrjunejune/main.c	Thu Aug 06 04:08:45 2026 -0700
+++ b/mrjunejune/main.c	Thu Aug 06 11:31:30 2026 -0700
@@ -691,6 +691,67 @@
   return resp;
 }
 
+static boolean Converted_Filename_Is_Valid(const char *filename)
+{
+  if (!filename)
+    return FALSE;
+  const char *extension = strrchr(filename, '.');
+  if (!extension || (strcmp(extension, ".webp") != 0 &&
+                     strcmp(extension, ".mp4") != 0))
+    return FALSE;
+  if ((size_t)(extension - filename) != 36)
+    return FALSE;
+  for (size_t i = 0; i < 36; i++)
+  {
+    char value = filename[i];
+    if (i == 8 || i == 13 || i == 18 || i == 23)
+    {
+      if (value != '-')
+        return FALSE;
+      continue;
+    }
+    if (!((value >= '0' && value <= '9') ||
+          (value >= 'a' && value <= 'f') ||
+          (value >= 'A' && value <= 'F')))
+      return FALSE;
+  }
+  return TRUE;
+}
+
+static Seobeo_Request_Entry *Converted_File_Error(
+    Dowa_Arena *arena,
+    char *status,
+    char *message)
+{
+  Seobeo_Request_Entry *resp = NULL;
+  Dowa_HashMap_Push_Arena(resp, "status", status, arena);
+  Dowa_HashMap_Push_Arena(resp, "content-type", "text/plain", arena);
+  Dowa_HashMap_Push_Arena(resp, "body", message, arena);
+  return resp;
+}
+
+Seobeo_Request_Entry *DeleteConvertedFile(
+    Seobeo_Request_Entry *req,
+    Dowa_Arena *arena)
+{
+  void *filename_kv = Dowa_HashMap_Get_Ptr(req, ":filename");
+  const char *filename = filename_kv
+      ? ((Seobeo_Request_Entry *)filename_kv)->value
+      : NULL;
+  if (!Converted_Filename_Is_Valid(filename))
+    return Converted_File_Error(arena, "400", "Invalid converted filename");
+
+  char filepath[512];
+  snprintf(filepath, sizeof(filepath), "/tmp/%s", filename);
+  if (unlink(filepath) != 0 && errno != ENOENT)
+    return Converted_File_Error(arena, "500", "Unable to delete converted file");
+
+  Seobeo_Request_Entry *resp = NULL;
+  Dowa_HashMap_Push_Arena(resp, "status", "204", arena);
+  Dowa_HashMap_Push_Arena(resp, "body", "", arena);
+  return resp;
+}
+
 Seobeo_Request_Entry *DownloadConvertedFile(Seobeo_Request_Entry *req, Dowa_Arena *arena)
 {
   Seobeo_Request_Entry *resp = NULL;
@@ -706,26 +767,8 @@
   }
 
   const char *filename = ((Seobeo_Request_Entry*)filename_kv)->value;
-
-  // TODO: Maybe check if the uuid is allowed or not?
-  // if (strlen(filename) != TMP_FILE_LENGTH)
-  // {
-  //   char *error_msg = "Not Allowed Filename";
-  //   Dowa_HashMap_Push_Arena(resp, "status", "404", arena);
-  //   Dowa_HashMap_Push_Arena(resp, "content-type", "text/plain", arena);
-  //   Dowa_HashMap_Push_Arena(resp, "body", error_msg, arena);
-  //   return resp;
-  // }
-  // boolean allowed = FALSE;
-  // for (int i = 0; i < Dowa_Array_Length(g_uuid4_array); i++)
-  // {
-  //   if strcmp(g_uuid4_array, filename)
-  //   {
-  //     allowed = TRUE;
-  //     break;
-  //   }
-  //   g_uuid4_array++;
-  // }
+  if (!Converted_Filename_Is_Valid(filename))
+    return Converted_File_Error(arena, "400", "Invalid converted filename");
 
   char filepath[512];
   snprintf(filepath, sizeof(filepath), "/tmp/%s", filename);
@@ -759,8 +802,8 @@
   file_data[file_size] = '\0';
   fclose(file);
 
-  const char *content_type = "application/octet-stream";
-  if (strstr(filename, ".webp"))
+  char *content_type = "application/octet-stream";
+  if (strcmp(strrchr(filename, '.'), ".webp") == 0)
     content_type = "image/webp";
   else if (strstr(filename, ".mp4"))
     content_type = "video/mp4";
@@ -2067,6 +2110,7 @@
   Seobeo_Router_Register("POST", "/api/convert/image-to-webp", ConvertImageToWebP);
   Seobeo_Router_Register("POST", "/api/convert/video-to-mp4", ConvertVideoToMP4);
   Seobeo_Router_Register("GET", "/api/download/:filename", DownloadConvertedFile);
+  Seobeo_Router_Register("DELETE", "/api/download/:filename", DeleteConvertedFile);
   Seobeo_Router_Register("POST", "/api/latex/render", RenderLatexPdf);
 
   // -- S3 Upload --/