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UACloudLibraryClient.cs
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UACloudLibraryClient.cs
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namespace Opc.Ua.Edge.Translator
{
using Newtonsoft.Json;
using Opc.Ua.Cloud.Library.Models;
using Opc.Ua.Export;
using System;
using System.Collections.Generic;
using System.IO;
using System.Net.Http;
using System.Text;
public class UACloudLibraryClient
{
public List<string> _nodeSetFilenames = new List<string>();
private HttpClient _client = new HttpClient();
public Dictionary<string, string> NamespacesInCloudLibrary { get; private set; } = new Dictionary<string, string>();
public void Login(string uaCloudLibraryUrl, string clientId, string secret)
{
if ((NamespacesInCloudLibrary.Count == 0) && !string.IsNullOrEmpty(clientId) && !string.IsNullOrEmpty(secret))
{
_client.DefaultRequestHeaders.Remove("Authorization");
_client.DefaultRequestHeaders.Add("Authorization", "basic " + Convert.ToBase64String(Encoding.UTF8.GetBytes(clientId + ":" + secret)));
if (!uaCloudLibraryUrl.EndsWith('/'))
{
uaCloudLibraryUrl += "/";
}
// get namespaces
string address = uaCloudLibraryUrl + "infomodel/namespaces";
HttpResponseMessage response = _client.Send(new HttpRequestMessage(HttpMethod.Get, address));
string[] identifiers = JsonConvert.DeserializeObject<string[]>(response.Content.ReadAsStringAsync().GetAwaiter().GetResult());
if (identifiers != null)
{
foreach (string nodeset in identifiers)
{
string[] tuple = nodeset.Split(",");
if (NamespacesInCloudLibrary.ContainsKey(tuple[0]))
{
NamespacesInCloudLibrary[tuple[0]] = tuple[1];
}
else
{
NamespacesInCloudLibrary.Add(tuple[0], tuple[1]);
}
}
}
}
}
public bool DownloadNamespace(string uaCloudLibraryUrl, string namespaceUrl)
{
if (!string.IsNullOrEmpty(uaCloudLibraryUrl) && !string.IsNullOrEmpty(namespaceUrl) && NamespacesInCloudLibrary.ContainsKey(namespaceUrl))
{
if (!uaCloudLibraryUrl.EndsWith('/'))
{
uaCloudLibraryUrl += "/";
}
string address = uaCloudLibraryUrl + "infomodel/download/" + Uri.EscapeDataString(NamespacesInCloudLibrary[namespaceUrl]);
HttpResponseMessage response = _client.Send(new HttpRequestMessage(HttpMethod.Get, address));
try
{
UANameSpace nameSpace = JsonConvert.DeserializeObject<UANameSpace>(response.Content.ReadAsStringAsync().GetAwaiter().GetResult());
if (!string.IsNullOrEmpty(nameSpace.Nodeset.NodesetXml))
{
// store the file locally
string filePath = Path.Combine(Directory.GetCurrentDirectory(), nameSpace.Title + ".nodeset2.xml");
File.WriteAllText(filePath, nameSpace.Nodeset.NodesetXml);
_nodeSetFilenames.Add(filePath);
return true;
}
}
catch (Exception)
{
return false;
}
}
return false;
}
public string ValidateNamespacesAndModels(string uaCloudLibraryUrl, bool autodownloadreferences)
{
// Collect all models as well as all required/referenced model namespace URIs listed in each file
List<string> models = new List<string>();
List<string> modelreferences = new List<string>();
foreach (string nodesetFile in _nodeSetFilenames)
{
using (Stream stream = new FileStream(nodesetFile, FileMode.Open))
{
UANodeSet nodeSet = UANodeSet.Read(stream);
// validate namespace URIs
if ((nodeSet.NamespaceUris != null) && (nodeSet.NamespaceUris.Length > 0))
{
foreach (string ns in nodeSet.NamespaceUris)
{
if (string.IsNullOrEmpty(ns) || !Uri.IsWellFormedUriString(ns, UriKind.Absolute))
{
return "Nodeset file " + nodesetFile + " contains an invalid Namespace URI: \"" + ns + "\"";
}
}
}
else
{
return "'NamespaceUris' entry missing in " + nodesetFile + ". Please add it!";
}
// validate model URIs
if ((nodeSet.Models != null) && (nodeSet.Models.Length > 0))
{
foreach (ModelTableEntry model in nodeSet.Models)
{
if (model != null)
{
if (Uri.IsWellFormedUriString(model.ModelUri, UriKind.Absolute))
{
// ignore the default namespace which is always present and don't add duplicates
if ((model.ModelUri != "http://opcfoundation.org/UA/") && !models.Contains(model.ModelUri))
{
models.Add(model.ModelUri);
}
}
else
{
return "Nodeset file " + nodesetFile + " contains an invalid Model Namespace URI: \"" + model.ModelUri + "\"";
}
if ((model.RequiredModel != null) && (model.RequiredModel.Length > 0))
{
foreach (ModelTableEntry requiredModel in model.RequiredModel)
{
if (requiredModel != null)
{
if (Uri.IsWellFormedUriString(requiredModel.ModelUri, UriKind.Absolute))
{
// ignore the default namespace which is always required and don't add duplicates
if ((requiredModel.ModelUri != "http://opcfoundation.org/UA/") && !modelreferences.Contains(requiredModel.ModelUri))
{
modelreferences.Add(requiredModel.ModelUri);
}
}
else
{
return "Nodeset file " + nodesetFile + " contains an invalid referenced Model Namespace URI: \"" + requiredModel.ModelUri + "\"";
}
}
}
}
}
}
}
else
{
return "'Model' entry missing in " + nodesetFile + ". Please add it!";
}
}
}
// now check if we have all references for each model we want to load
foreach (string modelreference in modelreferences)
{
if (!models.Contains(modelreference))
{
if (!autodownloadreferences)
{
return "Referenced OPC UA model " + modelreference + " is missing from selected list of nodeset files, please add the corresponding nodeset file to the list of loaded files!";
}
else
{
try
{
// try to auto-download the missing references from the UA Cloud Library
if (!uaCloudLibraryUrl.EndsWith('/'))
{
uaCloudLibraryUrl += "/";
}
string address = uaCloudLibraryUrl + "infomodel/download/" + Uri.EscapeDataString(NamespacesInCloudLibrary[modelreference]);
HttpResponseMessage response = _client.Send(new HttpRequestMessage(HttpMethod.Get, address));
UANameSpace nameSpace = JsonConvert.DeserializeObject<UANameSpace>(response.Content.ReadAsStringAsync().GetAwaiter().GetResult());
// store the file
string filePath = Path.Combine(Directory.GetCurrentDirectory(), nameSpace.Category.Name + ".nodeset2.xml");
File.WriteAllText(filePath, nameSpace.Nodeset.NodesetXml);
_nodeSetFilenames.Add(filePath);
}
catch (Exception ex)
{
return "Could not download referenced nodeset " + modelreference + ": " + ex.Message;
}
}
}
}
return string.Empty; // no error
}
}
}