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+/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2017.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.lufa-lib.org
+*/
+
+/*
+ Copyright 2017 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+ Permission to use, copy, modify, distribute, and sell this
+ software and its documentation for any purpose is hereby granted
+ without fee, provided that the above copyright notice appear in
+ all copies and that both that the copyright notice and this
+ permission notice and warranty disclaimer appear in supporting
+ documentation, and that the name of the author not be used in
+ advertising or publicity pertaining to distribution of the
+ software without specific, written prior permission.
+
+ The author disclaims all warranties with regard to this
+ software, including all implied warranties of merchantability
+ and fitness. In no event shall the author be liable for any
+ special, indirect or consequential damages or any damages
+ whatsoever resulting from loss of use, data or profits, whether
+ in an action of contract, negligence or other tortious action,
+ arising out of or in connection with the use or performance of
+ this software.
+*/
+
+/** \file
+ *
+ * Simple HTTP Webserver Application. When connected to the uIP stack,
+ * this will serve out files to HTTP clients on port 80.
+ */
+
+#define INCLUDE_FROM_HTTPSERVERAPP_C
+#include "HTTPServerApp.h"
+
+/** HTTP server response header, for transmission before the page contents. This indicates to the host that a page exists at the
+ * given location, and gives extra connection information.
+ */
+const char PROGMEM HTTP200Header[] = "HTTP/1.1 200 OK\r\n"
+ "Server: LUFA " LUFA_VERSION_STRING "\r\n"
+ "Connection: close\r\n"
+ "MIME-version: 1.0\r\n"
+ "Content-Type: ";
+
+/** HTTP server response header, for transmission before a resource not found error. This indicates to the host that the given
+ * URL is invalid, and gives extra error information.
+ */
+const char PROGMEM HTTP404Header[] = "HTTP/1.1 404 Not Found\r\n"
+ "Server: LUFA " LUFA_VERSION_STRING "\r\n"
+ "Connection: close\r\n"
+ "MIME-version: 1.0\r\n"
+ "Content-Type: text/plain\r\n\r\n"
+ "Error 404: File Not Found: /";
+
+/** Default filename to fetch when a directory is requested */
+const char PROGMEM DefaultDirFileName[] = "index.htm";
+
+/** Default MIME type sent if no other MIME type can be determined. */
+const char PROGMEM DefaultMIMEType[] = "text/plain";
+
+/** List of MIME types for each supported file extension. */
+const MIME_Type_t MIMETypes[] =
+ {
+ {.Extension = "htm", .MIMEType = "text/html"},
+ {.Extension = "jpg", .MIMEType = "image/jpeg"},
+ {.Extension = "gif", .MIMEType = "image/gif"},
+ {.Extension = "bmp", .MIMEType = "image/bmp"},
+ {.Extension = "png", .MIMEType = "image/png"},
+ {.Extension = "ico", .MIMEType = "image/x-icon"},
+ {.Extension = "exe", .MIMEType = "application/octet-stream"},
+ {.Extension = "gz", .MIMEType = "application/x-gzip"},
+ {.Extension = "zip", .MIMEType = "application/zip"},
+ {.Extension = "pdf", .MIMEType = "application/pdf"},
+ };
+
+/** FATFs structure to hold the internal state of the FAT driver for the Dataflash contents. */
+FATFS DiskFATState;
+
+
+/** Initialization function for the simple HTTP webserver. */
+void HTTPServerApp_Init(void)
+{
+ /* Listen on port 80 for HTTP connections from hosts */
+ uip_listen(HTONS(HTTP_SERVER_PORT));
+
+ /* Mount the Dataflash disk via FatFS */
+ f_mount(0, &DiskFATState);
+}
+
+/** uIP stack application callback for the simple HTTP webserver. This function must be called each time the
+ * TCP/IP stack needs a TCP packet to be processed.
+ */
+void HTTPServerApp_Callback(void)
+{
+ uip_tcp_appstate_t* const AppState = &uip_conn->appstate;
+
+ if (uip_aborted() || uip_timedout() || uip_closed())
+ {
+ /* Lock to the closed state so that no further processing will occur on the connection */
+ AppState->HTTPServer.CurrentState = WEBSERVER_STATE_Closing;
+ AppState->HTTPServer.NextState = WEBSERVER_STATE_Closing;
+ }
+
+ if (uip_connected())
+ {
+ /* New connection - initialize connection state values */
+ AppState->HTTPServer.CurrentState = WEBSERVER_STATE_OpenRequestedFile;
+ AppState->HTTPServer.NextState = WEBSERVER_STATE_OpenRequestedFile;
+ AppState->HTTPServer.FileOpen = false;
+ AppState->HTTPServer.ACKedFilePos = 0;
+ AppState->HTTPServer.SentChunkSize = 0;
+ }
+
+ if (uip_acked())
+ {
+ /* Add the amount of ACKed file data to the total sent file bytes counter */
+ AppState->HTTPServer.ACKedFilePos += AppState->HTTPServer.SentChunkSize;
+
+ /* Progress to the next state once the current state's data has been ACKed */
+ AppState->HTTPServer.CurrentState = AppState->HTTPServer.NextState;
+ }
+
+ if (uip_rexmit())
+ {
+ /* Return file pointer to the last ACKed position */
+ f_lseek(&AppState->HTTPServer.FileHandle, AppState->HTTPServer.ACKedFilePos);
+ }
+
+ if (uip_rexmit() || uip_acked() || uip_newdata() || uip_connected() || uip_poll())
+ {
+ switch (AppState->HTTPServer.CurrentState)
+ {
+ case WEBSERVER_STATE_OpenRequestedFile:
+ HTTPServerApp_OpenRequestedFile();
+ break;
+ case WEBSERVER_STATE_SendResponseHeader:
+ HTTPServerApp_SendResponseHeader();
+ break;
+ case WEBSERVER_STATE_SendData:
+ HTTPServerApp_SendData();
+ break;
+ case WEBSERVER_STATE_Closing:
+ /* Connection is being terminated for some reason - close file handle */
+ f_close(&AppState->HTTPServer.FileHandle);
+ AppState->HTTPServer.FileOpen = false;
+
+ /* If connection is not already closed, close it */
+ uip_close();
+
+ AppState->HTTPServer.CurrentState = WEBSERVER_STATE_Closed;
+ AppState->HTTPServer.NextState = WEBSERVER_STATE_Closed;
+ break;
+ }
+ }
+}
+
+/** HTTP Server State handler for the Request Process state. This state manages the processing of incoming HTTP
+ * GET requests to the server from the receiving HTTP client.
+ */
+static void HTTPServerApp_OpenRequestedFile(void)
+{
+ uip_tcp_appstate_t* const AppState = &uip_conn->appstate;
+ char* const AppData = (char*)uip_appdata;
+
+ /* No HTTP header received from the client, abort processing */
+ if (!(uip_newdata()))
+ return;
+
+ char* RequestToken = strtok(AppData, " ");
+ char* RequestedFileName = strtok(NULL, " ");
+
+ /* Must be a GET request, abort otherwise */
+ if (strcmp_P(RequestToken, PSTR("GET")) != 0)
+ {
+ uip_abort();
+ return;
+ }
+
+ /* Copy over the requested filename */
+ strlcpy(AppState->HTTPServer.FileName, &RequestedFileName[1], sizeof(AppState->HTTPServer.FileName));
+
+ /* Determine the length of the URI so that it can be checked to see if it is a directory */
+ uint8_t FileNameLen = strlen(AppState->HTTPServer.FileName);
+
+ /* If the URI is a directory, append the default filename */
+ if ((AppState->HTTPServer.FileName[FileNameLen - 1] == '/') || !(FileNameLen))
+ {
+ strlcpy_P(&AppState->HTTPServer.FileName[FileNameLen], DefaultDirFileName,
+ (sizeof(AppState->HTTPServer.FileName) - FileNameLen));
+ }
+
+ /* Try to open the file from the Dataflash disk */
+ AppState->HTTPServer.FileOpen = (f_open(&AppState->HTTPServer.FileHandle, AppState->HTTPServer.FileName,
+ (FA_OPEN_EXISTING | FA_READ)) == FR_OK);
+
+ /* Lock to the SendResponseHeader state until connection terminated */
+ AppState->HTTPServer.CurrentState = WEBSERVER_STATE_SendResponseHeader;
+ AppState->HTTPServer.NextState = WEBSERVER_STATE_SendResponseHeader;
+}
+
+/** HTTP Server State handler for the HTTP Response Header Send state. This state manages the transmission of
+ * the HTTP response header to the receiving HTTP client.
+ */
+static void HTTPServerApp_SendResponseHeader(void)
+{
+ uip_tcp_appstate_t* const AppState = &uip_conn->appstate;
+ char* const AppData = (char*)uip_appdata;
+
+ char* Extension = strpbrk(AppState->HTTPServer.FileName, ".");
+ bool FoundMIMEType = false;
+
+ /* If the file isn't already open, it wasn't found - send back a 404 error response and abort */
+ if (!(AppState->HTTPServer.FileOpen))
+ {
+ /* Copy over the HTTP 404 response header and send it to the receiving client */
+ strcpy_P(AppData, HTTP404Header);
+ strcat(AppData, AppState->HTTPServer.FileName);
+ uip_send(AppData, strlen(AppData));
+
+ AppState->HTTPServer.NextState = WEBSERVER_STATE_Closing;
+ return;
+ }
+
+ /* Copy over the HTTP 200 response header and send it to the receiving client */
+ strcpy_P(AppData, HTTP200Header);
+
+ /* Check to see if a MIME type for the requested file's extension was found */
+ if (Extension != NULL)
+ {
+ /* Look through the MIME type list, copy over the required MIME type if found */
+ for (uint8_t i = 0; i < (sizeof(MIMETypes) / sizeof(MIMETypes[0])); i++)
+ {
+ if (strcmp(&Extension[1], MIMETypes[i].Extension) == 0)
+ {
+ strcat(AppData, MIMETypes[i].MIMEType);
+ FoundMIMEType = true;
+ break;
+ }
+ }
+ }
+
+ /* Check if a MIME type was found and copied to the output buffer */
+ if (!(FoundMIMEType))
+ {
+ /* MIME type not found - copy over the default MIME type */
+ strcat_P(AppData, DefaultMIMEType);
+ }
+
+ /* Add the end-of-line terminator and end-of-headers terminator after the MIME type */
+ strcat_P(AppData, PSTR("\r\n\r\n"));
+
+ /* Send the MIME header to the receiving client */
+ uip_send(AppData, strlen(AppData));
+
+ /* When the MIME header is ACKed, progress to the data send stage */
+ AppState->HTTPServer.NextState = WEBSERVER_STATE_SendData;
+}
+
+/** HTTP Server State handler for the Data Send state. This state manages the transmission of file chunks
+ * to the receiving HTTP client.
+ */
+static void HTTPServerApp_SendData(void)
+{
+ uip_tcp_appstate_t* const AppState = &uip_conn->appstate;
+ char* const AppData = (char*)uip_appdata;
+
+ /* Get the maximum segment size for the current packet */
+ uint16_t MaxChunkSize = uip_mss();
+
+ /* Read the next chunk of data from the open file */
+ f_read(&AppState->HTTPServer.FileHandle, AppData, MaxChunkSize, &AppState->HTTPServer.SentChunkSize);
+
+ /* Send the next file chunk to the receiving client */
+ uip_send(AppData, AppState->HTTPServer.SentChunkSize);
+
+ /* Check if we are at the last chunk of the file, if so next ACK should close the connection */
+ if (MaxChunkSize != AppState->HTTPServer.SentChunkSize)
+ AppState->HTTPServer.NextState = WEBSERVER_STATE_Closing;
+}
+