public static IActionResult Run([HttpTrigger(AuthorizationLevel.Function, "get", Route = null)] HttpRequest req, ILogger log, ExecutionContext context)
{
config = new ServiceConfig();
if (File.Exists(String.Format($"{context.FunctionAppDirectory}/secrets.json")))
{
//secrets.json exists use it and environment variables
var builder = new ConfigurationBuilder()
.SetBasePath(context.FunctionAppDirectory)
.AddJsonFile("secrets.json", optional: true, reloadOnChange: true)
.AddEnvironmentVariables("FUNC_");
IConfigurationRoot root = builder.Build();
ConfigurationBinder.Bind(root, config);
}
else if (File.Exists(String.Format("{0}/{1}", context.FunctionAppDirectory, "local.settings.json")))
{
//use for local testing...do not use in production
//remember to add the storage connection string
var builder = new ConfigurationBuilder()
.SetBasePath(context.FunctionAppDirectory)
.AddJsonFile("local.settings.json", optional: true, reloadOnChange: true)
.AddEnvironmentVariables("FUNC_");
IConfigurationRoot root = builder.Build();
ConfigurationBinder.Bind(root, config);
config.StorageConnectionString = root.GetConnectionString("StorageConnectionString");
}
else
{
//no secrets or local.settings.json files...use only environment variables
var builder = new ConfigurationBuilder()
.AddEnvironmentVariables("FUNC_");
IConfigurationRoot root = builder.Build();
ConfigurationBinder.Bind(root, config);
}
string luss = req.Query["luss"];
try
{
EdgeGatewayConfiguration edgeConfig = ProvisionAsync(luss).GetAwaiter().GetResult();
return((ActionResult) new OkObjectResult(edgeConfig));
}
catch (Exception ex)
{
return(new BadRequestObjectResult(ex.Message));
}
}
private static async Task <EdgeGatewayConfiguration> ProvisionAsync(string luss)
{
LussEntity entity = await LussEntity.LoadAsync(luss, config.LussStorageTableName, config.StorageConnectionString);
if (entity == null || entity.Success.HasValue || entity.Expires < DateTime.Now)
{
return(null);
}
//get the security token to call Piraeus mgmt api
IEnumerable <Claim> claims = GetClaims(entity);
string accessToken = GetPiraeusAccessToken();
//create the CAPL policies
string publishPolicyId = null;
string subscribePolicyId = null;
AuthorizationPolicy pubPolicy = CreateCaplPolicy(entity, true, out publishPolicyId);
AuthorizationPolicy subPolicy = CreateCaplPolicy(entity, false, out subscribePolicyId);
//add the CAPL policies to Piraeus
AddCaplPolicy(pubPolicy, accessToken);
AddCaplPolicy(subPolicy, accessToken);
//create the pi-system metadata
string inputUriString = GetEventUriString(entity, true);
string outputUriString = GetEventUriString(entity, false);
EventMetadata inputMetadata = GetEventMetadata(inputUriString, publishPolicyId, subscribePolicyId, (ushort)entity.UnitId, true);
EventMetadata outputMetadata = GetEventMetadata(outputUriString, subscribePolicyId, publishPolicyId, (ushort)entity.UnitId, false);
//add the pi-systems to Piraeus
AddEventMetadata(inputMetadata, accessToken);
AddEventMetadata(outputMetadata, accessToken);
//update the RTU Map
RtuMap map = RtuMap.LoadFromConnectionStringAsync(config.RtuMapStorageContainerName, config.RtuMapFilename, config.StorageConnectionString).GetAwaiter().GetResult();
if (map == null)
{
map = new RtuMap();
}
else
{
if (map.HasItem((ushort)entity.UnitId))
{
map.Remove((ushort)entity.UnitId);
}
}
map.Add((ushort)entity.UnitId, inputUriString, outputUriString);
map.UpdateMapAsync(config.RtuMapStorageContainerName, config.RtuMapFilename, config.StorageConnectionString).GetAwaiter();
//update the LUSS entity
entity.Access = DateTime.UtcNow;
if (!entity.Success.HasValue)
{
entity.Success = true;
}
await entity.UpdateAsync();
string edgeSecurityToken = GetEdgeSecurityToken(entity);
//create the cofiguration to return
EdgeGatewayConfiguration edgeConfig = new EdgeGatewayConfiguration()
{
Hostname = entity.Hostname,
ModBusContainer = entity.ModbusContainer,
ModBusPort = entity.ModbusPort,
ModBusPath = entity.ModbusPath,
RtuInputPiSystem = inputUriString,
RtuOutputPiSsytem = outputUriString,
SecurityToken = edgeSecurityToken,
UnitId = entity.UnitId
};
return(edgeConfig);
}