vehicle-monitor/ESP32/src/WebServer.cpp

#include "WebServer.h"

#include "DebugLog.h"
#include "DataLogger.h"
#include "Info.h"
#include "utils.h"

#include <Arduino.h>
#include <SPIFFS.h>
#include <string>
#include <cstring>

#include "HTTPSServer.hpp"
#include "SSLCert.hpp"
#include "HTTPRequest.hpp"
#include "HTTPResponse.hpp"

// generated certificate data
#include "cert.h"
#include "private_key.h"

/** Check if we have multiple cores */
#if CONFIG_FREERTOS_UNICORE
#define WEBSERVER_RUNNING_CORE 0
#else
#define WEBSERVER_RUNNING_CORE 1
#endif

using namespace httpsserver;

detail::WebServer WebServer;

namespace detail
{
	// Create an SSL certificate object from the files included above
	SSLCert cert = SSLCert(
	  crt_DER, crt_DER_len,
	  private_key_DER, private_key_DER_len
	);

	HTTPSServer httpServer = HTTPSServer(&cert);

	WebServer::WebServer()
	{
	}

	WebServer::~WebServer()
	{
	}

	void WebServer::begin()
	{
		::DebugLog.println("Creating server task... ");
		xTaskCreatePinnedToCore(WebServer::ServerTask_, "webserver", 6144, nullptr, 1, nullptr, WEBSERVER_RUNNING_CORE);
	}

	void WebServer::setStatus(const Status& status)
	{
		status_ = status;
	}

	void WebServer::ServerTask_(void* params)
	{
		// Main HTML page
		ResourceNode* nodeRoot = new ResourceNode("/", "GET", &WebServer::HandleIndex_);
		ResourceNode* nodeIndex = new ResourceNode("/index.html", "GET", &WebServer::HandleIndex_);
		httpServer.registerNode(nodeRoot);
		httpServer.registerNode(nodeIndex);

		// API
		ResourceNode* nodeGetStatus = new ResourceNode("/api/status", "GET", &WebServer::HandleGetStatus_);
		ResourceNode* nodePostInfo = new ResourceNode("/api/info", "POST", &WebServer::HandlePostInfo_);
		httpServer.registerNode(nodeGetStatus);
		httpServer.registerNode(nodePostInfo);

		// Default node (either a static file, if found, or a 404 error)
		ResourceNode* nodeDefault = new ResourceNode("", "GET", &WebServer::HandleDefault_);
		httpServer.setDefaultNode(nodeDefault);

		::DebugLog.println("Starting server... ");
		httpServer.start();
		if (httpServer.isRunning()) {
			::DebugLog.println("Server ready.");

			while(true) {
				httpServer.loop();
				delay(1);
			}
		}
	}

	void WebServer::HandleIndex_(HTTPRequest * request, HTTPResponse * response)
	{
		// Status code is 200 OK by default.
		response->setHeader("Content-Type", "text/html");

		File file = SPIFFS.open("/www/index.html");
		SendContent_(file, response);
		file.close();
	}

	void WebServer::HandleGetStatus_(httpsserver::HTTPRequest * request, httpsserver::HTTPResponse * response)
	{
		const Status& status = ::WebServer.status_;

		int v = status.batteryVoltage;
		int c = status.batteryOutputCurrent;
		int s = (int)(status.speed * 1000.0f + 0.5f);
		int temp = status.temperature;
		int alt = status.altitude;

		int td = status.tripDistance;
		int ttt = status.tripTotalTime;
		int tmt = status.tripMovingTime;
		int tae = status.tripAscendingElevation / 100; // convert mm to dm
		int tme = status.tripMotorEnergy / 360; // convert Joules to dWh (tenth of Wh)

		float latitude = -1000.0f;
		float longitude = -1000.0f;
		char realtime[64] = {0};

		const char* logFileName = DataLogger::get().currentLogFileName();
		if(String(logFileName).startsWith("/log/")) logFileName += 5;

		int totalSize = (int)(SPIFFS.totalBytes() / 1000);
		int usedSize = (int)(SPIFFS.usedBytes() / 1000);

		char json[256];
		sprintf(json, "{\"v\":%d,\"c\":%d,\"s\":%d,\"td\":%d,\"ttt\":%d,\"tmt\":%d,\"tae\":%d,\"tme\":%d,\"temp\":%d,\"alt\":%d,\"log\":\"%s\",\"tot\":%d,\"used\":%d,\"lat\":%.5f,\"lng\":%.5f,\"d\":\"%s\"}", v, c, s, td, ttt, tmt, tae, tme, temp, alt, logFileName, totalSize, usedSize, latitude, longitude, realtime);

		response->setHeader("Content-Type", "text/json");
		response->print(json);
	}

	void WebServer::HandlePostInfo_(httpsserver::HTTPRequest * request, httpsserver::HTTPResponse * response)
	{
		char body[128]; // in current implementation, we expect the whole body to fit here
		size_t bodySize = request->readChars(body, sizeof(body) - 1);
		body[bodySize] = 0;

		request->discardRequestBody();

		//::DebugLog.println(body.c_str());

		Info receivedInfo;

		char* nextParam = body;
		while (true)
		{
			char* sepPos = strstr(nextParam, "&");
			if(sepPos == nullptr) sepPos = &body[bodySize];
			if(nextParam == sepPos)
				break; // should happen only if body is an empty string or ends with an "&" character

			*sepPos = 0; // split the string in-place, this overrides the separating character which is fine
			//::DebugLog.println(nextParam);

			char* eqPos = strstr(nextParam, "=");
			if(eqPos != nullptr && eqPos != nextParam && *(eqPos+1) != 0)
			{
				*eqPos = 0; // split the string in-place, overriding the equal sign

				char* paramName = nextParam;
				char* paramValue = eqPos + 1;
				utils::replaceString(paramValue, "%3A", ":");
				//::DebugLog.print(paramName); ::DebugLog.print(" = "); ::DebugLog.println(paramValue);

				if(strcmp(paramName, "lat") == 0)
				{
					char *ending = nullptr;
					receivedInfo.latitude = strtof(paramValue, &ending);
					if (*ending != 0)
						receivedInfo.latitude = -1000.0f;

				}
				else if(strcmp(paramName, "lng") == 0)
				{
					char *ending = nullptr;
					receivedInfo.longitude = strtof(paramValue, &ending);
					if (*ending != 0)
						receivedInfo.longitude = -1000.0f;

				}
				else if(strcmp(paramName, "alt") == 0)
				{
					char *ending = nullptr;
					receivedInfo.gpsAltitude = strtof(paramValue, &ending);
					if (*ending != 0)
						receivedInfo.gpsAltitude = -1000.0f;

				}
				else if(strcmp(paramName, "time") == 0)
				{
					strncpy(receivedInfo.realtime, paramValue, sizeof(receivedInfo.realtime));
				}
			}

			if(sepPos == &body[bodySize])
				break;
			nextParam = sepPos + 1;
		}

		if(::WebServer.infoReceived_ != nullptr)
		{
			::WebServer.infoReceived_(receivedInfo);
		}
	}

	void WebServer::HandleDefault_(HTTPRequest * request, HTTPResponse * response)
	{
		// Discard request body, if we received any
		// We do this, as this is the default node and may also server POST/PUT requests
		request->discardRequestBody();

		std::string filePath = "/www";
		std::string fullURL = request->getRequestString();
		filePath = filePath + fullURL.substr(0, fullURL.find("?"));
		//::DebugLog.println(filePath.c_str());
		File file = SPIFFS.open(filePath.c_str());

		if(!file || file.isDirectory())
		{
			// We've not found any matching file, so this is a 404 error

			response->setStatusCode(404);
			response->setStatusText("Not Found");

			response->setHeader("Content-Type", "text/html");

			response->println("<!DOCTYPE html>");
			response->println("<html>");
			response->println("<head><title>Not Found</title></head>");
			response->println("<body><h1>404 Not Found</h1><p>The requested resource was not found on this server.</p></body>");
			response->println("</html>");
		}
		else
		{
			// We've found a file, send the content

			response->setHeader("Cache-Control", "max-age=5184000");

			SendContent_(file, response);
		}

		file.close();
	}

	void WebServer::SendContent_(Stream& stream, httpsserver::HTTPResponse * response)
	{
		uint8_t buffer[128];
		while(stream.available())
		{
			size_t numBytes = stream.readBytes(buffer, sizeof(buffer));
			response->write(buffer, numBytes);
		}
	}
}