/// <summary>
/// Sends a Unlock-Request to the chargepoint
/// </summary>
private async Task UnlockConnector16(ChargePointStatus chargePointStatus, HttpContext apiCallerContext)
{
ILogger logger = _logFactory.CreateLogger("OCPPMiddleware.OCPP16");
ControllerOCPP16 controller16 = new ControllerOCPP16(_configuration, _logFactory, chargePointStatus);
Messages_OCPP16.UnlockConnectorRequest unlockConnectorRequest = new Messages_OCPP16.UnlockConnectorRequest();
unlockConnectorRequest.ConnectorId = 0;
string jsonResetRequest = JsonConvert.SerializeObject(unlockConnectorRequest);
OCPPMessage msgOut = new OCPPMessage();
msgOut.MessageType = "2";
msgOut.Action = "UnlockConnector";
msgOut.UniqueId = Guid.NewGuid().ToString("N");
msgOut.JsonPayload = jsonResetRequest;
msgOut.TaskCompletionSource = new TaskCompletionSource <string>();
// store HttpContext with MsgId for later answer processing (=> send anwer to API caller)
_requestQueue.Add(msgOut.UniqueId, msgOut);
// Send OCPP message with optional logging/dump
await SendOcpp16Message(msgOut, logger, chargePointStatus.WebSocket);
// Wait for asynchronous chargepoint response and processing
string apiResult = await msgOut.TaskCompletionSource.Task;
//
apiCallerContext.Response.StatusCode = 200;
apiCallerContext.Response.ContentType = "application/json";
await apiCallerContext.Response.WriteAsync(apiResult);
}
/// <summary>
/// Constructor
/// </summary>
public ControllerOCPP16(IConfiguration config, ILoggerFactory loggerFactory, ChargePointStatus chargePointStatus)
{
Configuration = config;
Logger = loggerFactory.CreateLogger(typeof(ControllerOCPP16));
if (chargePointStatus != null)
{
ChargePointStatus = chargePointStatus;
}
else
{
Logger.LogError("New ControllerOCPP16 => empty chargepoint status");
}
}
public async Task Invoke(HttpContext context)
{
_logger.LogTrace("OCPPMiddleware => Websocket request: Path='{0}'", context.Request.Path);
ChargePointStatus chargePointStatus = null;
if (context.Request.Path.StartsWithSegments("/OCPP"))
{
string chargepointIdentifier;
string[] parts = context.Request.Path.Value.Split('/');
if (string.IsNullOrWhiteSpace(parts[parts.Length - 1]))
{
// (Last part - 1) is chargepoint identifier
chargepointIdentifier = parts[parts.Length - 2];
}
else
{
// Last part is chargepoint identifier
chargepointIdentifier = parts[parts.Length - 1];
}
_logger.LogInformation("OCPPMiddleware => Connection request with chargepoint identifier = '{0}'", chargepointIdentifier);
// Known chargepoint?
if (!string.IsNullOrWhiteSpace(chargepointIdentifier))
{
using (OCPPCoreContext dbContext = new OCPPCoreContext(_configuration))
{
ChargePoint chargePoint = dbContext.Find <ChargePoint>(chargepointIdentifier);
if (chargePoint != null)
{
_logger.LogInformation("OCPPMiddleware => SUCCESS: Found chargepoint with identifier={0}", chargePoint.ChargePointId);
// Check optional chargepoint authentication
if (!string.IsNullOrWhiteSpace(chargePoint.Username))
{
// Chargepoint MUST send basic authentication header
bool basicAuthSuccess = false;
string authHeader = context.Request.Headers["Authorization"];
if (!string.IsNullOrEmpty(authHeader))
{
string[] cred = System.Text.ASCIIEncoding.ASCII.GetString(Convert.FromBase64String(authHeader.Substring(6))).Split(':');
if (cred.Length == 2 && chargePoint.Username == cred[0] && chargePoint.Password == cred[1])
{
// Authentication match => OK
_logger.LogInformation("OCPPMiddleware => SUCCESS: Basic authentication for chargepoint '{0}' match", chargePoint.ChargePointId);
basicAuthSuccess = true;
}
else
{
// Authentication does NOT match => Failure
_logger.LogWarning("OCPPMiddleware => FAILURE: Basic authentication for chargepoint '{0}' does NOT match", chargePoint.ChargePointId);
}
}
if (basicAuthSuccess == false)
{
context.Response.Headers.Add("WWW-Authenticate", "Basic realm=\"OCPP.Core\"");
context.Response.StatusCode = (int)HttpStatusCode.Unauthorized;
return;
}
}
else if (!string.IsNullOrWhiteSpace(chargePoint.ClientCertThumb))
{
// Chargepoint MUST send basic authentication header
bool certAuthSuccess = false;
X509Certificate2 clientCert = context.Connection.ClientCertificate;
if (clientCert != null)
{
if (clientCert.Thumbprint.Equals(chargePoint.ClientCertThumb, StringComparison.InvariantCultureIgnoreCase))
{
// Authentication match => OK
_logger.LogInformation("OCPPMiddleware => SUCCESS: Certificate authentication for chargepoint '{0}' match", chargePoint.ChargePointId);
certAuthSuccess = true;
}
else
{
// Authentication does NOT match => Failure
_logger.LogWarning("OCPPMiddleware => FAILURE: Certificate authentication for chargepoint '{0}' does NOT match", chargePoint.ChargePointId);
}
}
if (certAuthSuccess == false)
{
context.Response.StatusCode = (int)HttpStatusCode.Unauthorized;
return;
}
}
else
{
_logger.LogInformation("OCPPMiddleware => No authentication for chargepoint '{0}' configured", chargePoint.ChargePointId);
}
// Store chargepoint data
chargePointStatus = new ChargePointStatus(chargePoint);
}
else
{
_logger.LogWarning("OCPPMiddleware => FAILURE: Found no chargepoint with identifier={0}", chargepointIdentifier);
}
}
}
if (chargePointStatus != null)
{
if (context.WebSockets.IsWebSocketRequest)
{
// Match supported sub protocols
string subProtocol = null;
foreach (string supportedProtocol in SupportedProtocols)
{
if (context.WebSockets.WebSocketRequestedProtocols.Contains(supportedProtocol))
{
subProtocol = supportedProtocol;
break;
}
}
if (string.IsNullOrEmpty(subProtocol))
{
// Not matching protocol! => failure
string protocols = string.Empty;
foreach (string p in context.WebSockets.WebSocketRequestedProtocols)
{
if (string.IsNullOrEmpty(protocols))
{
protocols += ",";
}
protocols += p;
}
_logger.LogWarning("OCPPMiddleware => No supported sub-protocol in '{0}' from charge station '{1}'", protocols, chargepointIdentifier);
context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
}
else
{
chargePointStatus.Protocol = subProtocol;
bool statusSuccess = false;
try
{
_logger.LogTrace("OCPPMiddleware => Store/Update status object");
lock (_chargePointStatusDict)
{
// Check if this chargepoint already/still hat a status object
if (_chargePointStatusDict.ContainsKey(chargepointIdentifier))
{
// exists => check status
if (_chargePointStatusDict[chargepointIdentifier].WebSocket.State != WebSocketState.Open)
{
// Closed or aborted => remove
_chargePointStatusDict.Remove(chargepointIdentifier);
}
}
_chargePointStatusDict.Add(chargepointIdentifier, chargePointStatus);
statusSuccess = true;
}
}
catch (Exception exp)
{
_logger.LogError(exp, "OCPPMiddleware => Error storing status object in dictionary => refuse connection");
context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
}
if (statusSuccess)
{
// Handle socket communication
_logger.LogTrace("OCPPMiddleware => Waiting for message...");
using (WebSocket webSocket = await context.WebSockets.AcceptWebSocketAsync(subProtocol))
{
_logger.LogTrace("OCPPMiddleware => WebSocket connection with charge point '{0}'", chargepointIdentifier);
chargePointStatus.WebSocket = webSocket;
if (subProtocol == Protocol_OCPP20)
{
// OCPP V2.0
await Receive20(chargePointStatus, context);
}
else
{
// OCPP V1.6
await Receive16(chargePointStatus, context);
}
}
}
}
}
else
{
// no websocket request => failure
_logger.LogWarning("OCPPMiddleware => Non-Websocket request");
context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
}
}
else
{
// unknown chargepoint
_logger.LogTrace("OCPPMiddleware => no chargepoint: http 412");
context.Response.StatusCode = (int)HttpStatusCode.PreconditionFailed;
}
}
else if (context.Request.Path.StartsWithSegments("/API"))
{
// Check authentication (X-API-Key)
string apiKeyConfig = _configuration.GetValue <string>("ApiKey");
if (!string.IsNullOrWhiteSpace(apiKeyConfig))
{
// ApiKey specified => check request
string apiKeyCaller = context.Request.Headers["X-API-Key"].FirstOrDefault();
if (apiKeyConfig == apiKeyCaller)
{
// API-Key matches
_logger.LogInformation("OCPPMiddleware => Success: X-API-Key matches");
}
else
{
// API-Key does NOT matches => authentication failure!!!
_logger.LogWarning("OCPPMiddleware => Failure: Wrong X-API-Key! Caller='{0}'", apiKeyCaller);
context.Response.StatusCode = (int)HttpStatusCode.Unauthorized;
return;
}
}
else
{
// No API-Key configured => no authenticatiuon
_logger.LogWarning("OCPPMiddleware => No X-API-Key configured!");
}
// format: /API/<command>[/chargepointId]
string[] urlParts = context.Request.Path.Value.Split('/');
if (urlParts.Length >= 3)
{
string cmd = urlParts[2];
string urlChargePointId = (urlParts.Length >= 4) ? urlParts[3] : null;
_logger.LogTrace("OCPPMiddleware => cmd='{0}' / id='{1}' / FullPath='{2}')", cmd, urlChargePointId, context.Request.Path.Value);
if (cmd == "Status")
{
try
{
List <ChargePointStatus> statusList = new List <ChargePointStatus>();
foreach (ChargePointStatus status in _chargePointStatusDict.Values)
{
statusList.Add(status);
}
string jsonStatus = JsonConvert.SerializeObject(statusList);
context.Response.ContentType = "application/json";
await context.Response.WriteAsync(jsonStatus);
}
catch (Exception exp)
{
_logger.LogError(exp, "OCPPMiddleware => Error: {0}", exp.Message);
context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
}
}
else if (cmd == "Reset")
{
if (!string.IsNullOrEmpty(urlChargePointId))
{
try
{
ChargePointStatus status = null;
if (_chargePointStatusDict.TryGetValue(urlChargePointId, out status))
{
// Send message to chargepoint
if (status.Protocol == Protocol_OCPP20)
{
// OCPP V2.0
await Reset20(status, context);
}
else
{
// OCPP V1.6
await Reset16(status, context);
}
}
else
{
// Chargepoint offline
_logger.LogError("OCPPMiddleware SoftReset => Chargepoint offline: {0}", urlChargePointId);
context.Response.StatusCode = (int)HttpStatusCode.NotFound;
}
}
catch (Exception exp)
{
_logger.LogError(exp, "OCPPMiddleware SoftReset => Error: {0}", exp.Message);
context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
}
}
else
{
_logger.LogError("OCPPMiddleware SoftReset => Missing chargepoint ID");
context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
}
}
else if (cmd == "UnlockConnector")
{
if (!string.IsNullOrEmpty(urlChargePointId))
{
try
{
ChargePointStatus status = null;
if (_chargePointStatusDict.TryGetValue(urlChargePointId, out status))
{
// Send message to chargepoint
if (status.Protocol == Protocol_OCPP20)
{
// OCPP V2.0
await UnlockConnector20(status, context);
}
else
{
// OCPP V1.6
await UnlockConnector16(status, context);
}
}
else
{
// Chargepoint offline
_logger.LogError("OCPPMiddleware UnlockConnector => Chargepoint offline: {0}", urlChargePointId);
context.Response.StatusCode = (int)HttpStatusCode.NotFound;
}
}
catch (Exception exp)
{
_logger.LogError(exp, "OCPPMiddleware UnlockConnector => Error: {0}", exp.Message);
context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
}
}
else
{
_logger.LogError("OCPPMiddleware UnlockConnector => Missing chargepoint ID");
context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
}
}
else
{
// Unknown action/function
_logger.LogWarning("OCPPMiddleware => action/function: {0}", cmd);
context.Response.StatusCode = (int)HttpStatusCode.NotFound;
}
}
}
else if (context.Request.Path.StartsWithSegments("/"))
{
try
{
bool showIndexInfo = _configuration.GetValue <bool>("ShowIndexInfo");
if (showIndexInfo)
{
_logger.LogTrace("OCPPMiddleware => Index status page");
context.Response.ContentType = "text/plain";
await context.Response.WriteAsync(string.Format("Running...\r\n\r\n{0} chargepoints connected", _chargePointStatusDict.Values.Count));
}
else
{
_logger.LogInformation("OCPPMiddleware => Root path with deactivated index page");
context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
}
}
catch (Exception exp)
{
_logger.LogError(exp, "OCPPMiddleware => Error: {0}", exp.Message);
context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
}
}
else
{
_logger.LogWarning("OCPPMiddleware => Bad path request");
context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
}
}
/// <summary>
/// Waits for new OCPP V1.6 messages on the open websocket connection and delegates processing to a controller
/// </summary>
private async Task Receive16(ChargePointStatus chargePointStatus, HttpContext context)
{
ILogger logger = _logFactory.CreateLogger("OCPPMiddleware.OCPP16");
ControllerOCPP16 controller16 = new ControllerOCPP16(_configuration, _logFactory, chargePointStatus);
byte[] buffer = new byte[1024 * 4];
MemoryStream memStream = new MemoryStream(buffer.Length);
while (chargePointStatus.WebSocket.State == WebSocketState.Open)
{
WebSocketReceiveResult result = await chargePointStatus.WebSocket.ReceiveAsync(new ArraySegment <byte>(buffer), CancellationToken.None);
if (result != null && result.MessageType != WebSocketMessageType.Close)
{
logger.LogTrace("OCPPMiddleware.Receive16 => Receiving segment: {0} bytes (EndOfMessage={1} / MsgType={2})", result.Count, result.EndOfMessage, result.MessageType);
memStream.Write(buffer, 0, result.Count);
if (result.EndOfMessage)
{
// read complete message into byte array
byte[] bMessage = memStream.ToArray();
// reset memory stream für next message
memStream = new MemoryStream(buffer.Length);
string dumpDir = _configuration.GetValue <string>("MessageDumpDir");
if (!string.IsNullOrWhiteSpace(dumpDir))
{
string path = Path.Combine(dumpDir, string.Format("{0}_ocpp16-in.txt", DateTime.Now.ToString("yyyy-MM-dd_HH-mm-ss-ffff")));
try
{
// Write incoming message into dump directory
File.WriteAllBytes(path, bMessage);
}
catch (Exception exp)
{
logger.LogError(exp, "OCPPMiddleware.Receive16 => Error dumping incoming message to path: '{0}'", path);
}
}
string ocppMessage = UTF8Encoding.UTF8.GetString(bMessage);
Match match = Regex.Match(ocppMessage, MessageRegExp);
if (match != null && match.Groups != null && match.Groups.Count >= 3)
{
string messageTypeId = match.Groups[1].Value;
string uniqueId = match.Groups[2].Value;
string action = match.Groups[3].Value;
string jsonPaylod = match.Groups[4].Value;
logger.LogInformation("OCPPMiddleware.Receive16 => OCPP-Message: Type={0} / ID={1} / Action={2})", messageTypeId, uniqueId, action);
OCPPMessage msgIn = new OCPPMessage(messageTypeId, uniqueId, action, jsonPaylod);
if (msgIn.MessageType == "2")
{
// Request from chargepoint to OCPP server
OCPPMessage msgOut = controller16.ProcessRequest(msgIn);
// Send OCPP message with optional logging/dump
await SendOcpp16Message(msgOut, logger, chargePointStatus.WebSocket);
}
else if (msgIn.MessageType == "3" || msgIn.MessageType == "4")
{
// Process answer from chargepoint
if (_requestQueue.ContainsKey(msgIn.UniqueId))
{
controller16.ProcessAnswer(msgIn, _requestQueue[msgIn.UniqueId]);
_requestQueue.Remove(msgIn.UniqueId);
}
else
{
logger.LogError("OCPPMiddleware.Receive16 => HttpContext from caller not found / Msg: {0}", ocppMessage);
}
}
else
{
// Unknown message type
logger.LogError("OCPPMiddleware.Receive16 => Unknown message type: {0} / Msg: {1}", msgIn.MessageType, ocppMessage);
}
}
else
{
logger.LogWarning("OCPPMiddleware.Receive16 => Error in RegEx-Matching: Msg={0})", ocppMessage);
}
}
}
else
{
logger.LogInformation("OCPPMiddleware.Receive16 => WebSocket Closed: CloseStatus={0} / MessageType={1}", result?.CloseStatus, result?.MessageType);
await chargePointStatus.WebSocket.CloseOutputAsync((WebSocketCloseStatus)3001, string.Empty, CancellationToken.None);
}
}
logger.LogInformation("OCPPMiddleware.Receive16 => Websocket closed: State={0} / CloseStatus={1}", chargePointStatus.WebSocket.State, chargePointStatus.WebSocket.CloseStatus);
ChargePointStatus dummy;
_chargePointStatusDict.Remove(chargePointStatus.Id, out dummy);
}