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Gerhard-Viennakrzmaz
Gerhard-Vienna
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‎src/cgi.h

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/*
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* Copyright (c) 2023 Gerhard Schiller ([email protected])
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* SPDX-License-Identifier: GPL-3.0-or-later
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* https://www.gnu.org/licenses/gpl-3.0.txt
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*
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* This code is based on parts of the file: "LwIP/LwIP_HTTP_Server_Raw/Src/httpd_cg_ssi.c"
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*
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*
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* For details see the copyright notice below.
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*
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* Note: this STMicroelectronics software component has no LICENSE file
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* in its root directory.
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*
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*/
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/**
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******************************************************************************
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* @file LwIP/LwIP_HTTP_Server_Raw/Src/httpd_cg_ssi.c
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* @author MCD Application Team
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* @brief Webserver SSI and CGI handlers
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2017 STMicroelectronics.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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*/
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#include "lwip/apps/httpd.h"
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#include "pico/cyw43_arch.h"
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#include "lwipopts.h"
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#include <string.h>
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#include <stdlib.h>
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// GPIOs for Leds
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#define LED1 18
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#define LED2 19
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#define LED3 20
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#define LED4 21
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/* CGI handler for LED control */
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const char * LEDS_CGI_Handler(int iIndex, int iNumParams, char *pcParam[], char *pcValue[]);
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/* CGI handler for LED control with feedback*/
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const char * LEDS_CGI_Handler2(int iIndex, int iNumParams, char *pcParam[], char *pcValue[]);
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/* Html request for "/leds.cgi" will start LEDS_CGI_Handler */
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const tCGI LEDS_CGI={"/leds.cgi", LEDS_CGI_Handler};
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/* Html request for "/leds2.cgi" will start LEDS_CGI_Handler2 */
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const tCGI LEDS_CGI2={"/leds2.cgi", LEDS_CGI_Handler2};
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/* Cgi call table, two CGI used */
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tCGI CGI_TAB[2];
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void LED_On(int led){
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printf("GPIO%d on\n", led);
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gpio_put(led, 1);
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}
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void LED_Off(int led){
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printf("GPIO%d off\n", led);
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gpio_put(led, 0);
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}
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const char * LEDS_CGI_Handler(int iIndex, int iNumParams, char *pcParam[], char *pcValue[])
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{
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int i=0;
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/* First SSI handler iIndex = 0 (see CGI_TAB[] in cgi_init() )*/
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if (iIndex==0)
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{
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/* All leds off */
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LED_Off(LED1);
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LED_Off(LED2);
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LED_Off(LED3);
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LED_Off(LED4);
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/* Check cgi parameter : application GET /leds.cgi?led=2&led=4 */
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for (i=0; i<iNumParams; i++){
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/* check parameter "led" */
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if (strcmp(pcParam[i] , "led") == 0){
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/* switch led1 ON if 1 */
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if(strcmp(pcValue[i], "1") == 0)
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LED_On(LED1);
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/* switch led2 ON if 2 */
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else if(strcmp(pcValue[i], "2") == 0)
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LED_On(LED2);
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/* switch led3 ON if 3 */
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else if(strcmp(pcValue[i], "3") == 0)
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LED_On(LED3);
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/* switch led4 ON if 4 */
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else if(strcmp(pcValue[i], "4") == 0)
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LED_On(LED4);
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}
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}
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}
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/* uri to send after cgi call*/
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return "/cgi.html";
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}
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const char * LEDS_CGI_Handler2(int iIndex, int iNumParams, char *pcParam[], char *pcValue[])
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{
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int i=0;
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/* Second SSI handler iIndex = 1 (see CGI_TAB[] in cgi_init() )*/
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if (iIndex==1)
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{
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/* All leds off */
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LED_Off(LED1);
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LED_Off(LED2);
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LED_Off(LED3);
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LED_Off(LED4);
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/* Check cgi parameter : application GET /leds.cgi?led=2&led=4 */
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for (i=0; i<iNumParams; i++){
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/* check parameter "led" */
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if (strcmp(pcParam[i] , "led") == 0){
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/* switch led1 ON if 1 */
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if(strcmp(pcValue[i], "1") == 0)
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LED_On(LED1);
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/* switch led2 ON if 2 */
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else if(strcmp(pcValue[i], "2") == 0)
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LED_On(LED2);
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/* switch led3 ON if 3 */
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else if(strcmp(pcValue[i], "3") == 0)
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LED_On(LED3);
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/* switch led4 ON if 4 */
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else if(strcmp(pcValue[i], "4") == 0)
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LED_On(LED4);
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}
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}
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}
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/* uri to send after cgi call*/
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return "/ssi_cgi.shtml";
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}
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void cgi_init(void)
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{
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/* configure CGI handler */
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CGI_TAB[0] = LEDS_CGI;
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CGI_TAB[1] = LEDS_CGI2;
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http_set_cgi_handlers(CGI_TAB, 2);
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for(int i = LED1; i <= LED4; i++){
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gpio_init(i);
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gpio_set_dir(i, GPIO_OUT);
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gpio_put(i, 0);
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}
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}

‎src/fs/cgi.html

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<!DOCTYPE html>
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<html>
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<head> <title>Pico W CGI-PAGE</title> </head>
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<body> <h1>Pico W</h1>
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<h3>CGI-PAGE</h3>
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<span>
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This page allows you to control four leds: LED1, LED2, LED3 and LED4 connected to GPIO18 - 21<br><br>
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To turn a led on/off check/uncheck its corresponding checkbox.<br>
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Then click on the "Send" button to submit the changes.<br>
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</span>
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<br>
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<form method="get" action="/leds.cgi">
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<input value="1" name="led" type="checkbox">LED1<br>
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<input value="2" name="led" type="checkbox">LED2<br>
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<input value="3" name="led" type="checkbox">LED3<br>
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<input value="4" name="led" type="checkbox">LED4<br>
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<br>
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<input value="Send" type="submit">
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</form>
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<br>
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<br>
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<a href="/index.html">Back</a>
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</body>
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</html>

‎src/fs/ssi_cgi.shtml

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<!DOCTYPE html>
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<html>
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<head> <title>Pico W CGI-SSI-PAGE</title> </head>
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<body> <h1>Pico W</h1>
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<h3>CGI with Feedback (ssi) PAGE</h3>
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<span>
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This page allows you to control four leds: LED1, LED2, LED3 and LED4 connected to GPIO18 - 21<br><br>
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To turn a led on/off check/uncheck its corresponding checkbox.<br>
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Then click on the "Send" button to submit the changes.<br>
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</span>
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<br>
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<form method="get" action="/leds2.cgi">
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<input value="1" name="led" type="checkbox" <!--#state1-->>
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<span style=<!--#bg1-->>LED1</span><br>
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<input value="2" name="led" type="checkbox" <!--#state2-->>
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<span style=<!--#bg2-->>LED2</span><br>
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<input value="3" name="led" type="checkbox" <!--#state3-->>
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<span style=<!--#bg3-->>LED3</span><br>
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<input value="4" name="led" type="checkbox" <!--#state4-->>
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<span style=<!--#bg4-->>LED4</span><br>
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<input value="Send" type="submit">
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</form>
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<br>
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<br>
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<a href="/index.html">Back</a>
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</body>
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</html>
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