upload_service.h

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// Copyright (C) 2026 Douglas Quigg (dstroy0) <dquigg123@gmail.com>
// SPDX-License-Identifier: AGPL-3.0-or-later
 
/**
 * @file upload_service.h
 * @brief Streaming file upload to an Arduino FS (DETWS_ENABLE_UPLOAD).
 *
 * Registers a POST route whose request body is streamed straight into a file on
 * a filesystem (LittleFS / SPIFFS / SD) in FILE_CHUNK_SIZE pieces - the upload
 * never has to fit in RAM. Reuses the parser's streaming-body hook (the same
 * mechanism OTA uses), so it is zero-heap and bounded.
 *
 * One upload at a time (the device runs a single loop task). Only one streaming
 * sink can be installed, so DETWS_ENABLE_UPLOAD and DETWS_ENABLE_OTA share the
 * parser hook - register whichever you need (not both on the same build).
 */
 
#ifndef DETERMINISTICESPASYNCWEBSERVER_UPLOAD_SERVICE_H
#define DETERMINISTICESPASYNCWEBSERVER_UPLOAD_SERVICE_H
 
#include "ServerConfig.h"
 
#if DETWS_ENABLE_UPLOAD
 
#include <FS.h>
#include <stddef.h>
 
class DetWebServer;
 
/**
 * @brief Register a streaming-upload endpoint.
 *
 * A `POST @p path` request streams its body into @p dest_path on @p fs (the file
 * is truncated/created). The route handler replies `200 OK <n> bytes` on success
 * or 500 on a write failure.
 *
 * @param server    the web server.
 * @param path      the upload URL (e.g. "/upload").
 * @param fs        target filesystem (LittleFS / SPIFFS / SD).
 * @param dest_path destination file path (e.g. "/uploads/data.bin").
 */
void detws_upload_begin(DetWebServer &server, const char *path, fs::FS &fs, const char *dest_path);
 
/** @brief Bytes written by the most recent upload (for handlers / tests). */
size_t detws_upload_last_size();
 
#endif // DETWS_ENABLE_UPLOAD
 
#endif // DETERMINISTICESPASYNCWEBSERVER_UPLOAD_SERVICE_H