fix: webhook now uses utility::mime_type

src/dpp/webhook.cpp

@@ -96,19 +96,13 @@ json webhook::to_json_impl(bool with_id) const {
 }
 
 webhook& webhook::load_image(const std::string &image_blob, const image_type type, bool is_base64_encoded) {
-	static const std::map<image_type, std::string> mimetypes = {
-		{ i_gif, "image/gif" },
-		{ i_jpg, "image/jpeg" },
-		{ i_png, "image/png" },
-		{ i_webp, "image/webp" },
-	};
 	if (image_blob.size() > MAX_ICON_SIZE) {
 		throw dpp::length_exception("Webhook icon file exceeds discord limit of 256 kilobytes");
 	}
 
 	/* If there's already image data defined, free the old data, to prevent a memory leak */
 	delete image_data;
-	image_data = new std::string("data:" + mimetypes.find(type)->second + ";base64," + (is_base64_encoded ? image_blob : base64_encode((unsigned char const*)image_blob.data(), (unsigned int)image_blob.length())));
+	image_data = new std::string("data:" + utility::mime_type(type) + ";base64," + (is_base64_encoded ? image_blob : base64_encode((unsigned char const*)image_blob.data(), (unsigned int)image_blob.length())));
 
 	return *this;
 }