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WebClass.cs
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WebClass.cs
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//-----------------------------------------------------------------------
// <copyright file="WebClass.cs">
// Copyright (c) 2016, 2020 Kent P. McKinney
// Released under the terms of the MIT License
// </copyright>
//-----------------------------------------------------------------------
using System.Linq;
using System.Collections.Generic;
using System.Net;
using System.Xml;
using System.Net.Http;
using System.Threading;
namespace VehicleInformationLookupTool
{
public class WebClass : IWebClass
{
private readonly HttpClient _client = new HttpClient();
public WebClass()
{
/* Configure network connection settings */
ServicePointManager.DefaultConnectionLimit = 4;
ServicePointManager.Expect100Continue = false;
ServicePointManager.CheckCertificateRevocationList = false;
ServicePointManager.ReusePort = true;
ServicePointManager.UseNagleAlgorithm = false;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls | SecurityProtocolType.Ssl3;
}
private bool IsConnectedToInternet()
{
try
{
_ = _client.GetAsync(@"http://www.google.com").Result;
return true;
}
catch
{
return false;
}
return false;
}
public bool IsApiAccessible(string uri, CancellationToken token)
{
/* Perform a GET against the API and store the raw XML result */
const string testVin = "JH4TB2H26CC000000";
var rawXmlString = ApiRequest(uri, testVin, token);
if (string.IsNullOrWhiteSpace(rawXmlString) || rawXmlString == "exception")
{
return false;
}
/* De-serialize the XML and get the Message node */
var xmlDoc = new XmlDocument();
xmlDoc.LoadXml(rawXmlString);
var messageNode = xmlDoc.SelectNodes(@"//Message");
/* Return a success boolean based on the value of the Message node */
return messageNode != null && messageNode[0].InnerText.StartsWith("Results returned successfully");
}
public List<string> GetVinDataRow(string uri, string lookupVin, string xpath, bool autoCorrect, bool discardInvalid, CancellationToken token)
{
/* This method is called from an alternate thread */
/* Perform a GET against the API and store the raw XML result */
var rawXmlString = ApiRequest(uri, lookupVin, token);
if (string.IsNullOrWhiteSpace(rawXmlString) || rawXmlString == "exception")
{
return default;
}
/* De-serialize the XML and get the relevant nodes */
var xmlDoc = new XmlDocument();
xmlDoc.LoadXml(rawXmlString);
var nodes = xmlDoc.SelectNodes(xpath);
if (nodes == null || nodes.Count <= 0)
{
return default;
}
var messageNode = xmlDoc.SelectNodes(@"//Message");
var message = messageNode?[0]?.InnerText ?? string.Empty;
var errorNode = xmlDoc.SelectNodes(@"//ErrorCode");
var error = errorNode?[0]?.InnerText ?? string.Empty;
var suggestedVinNode = xmlDoc.SelectNodes(@"//SuggestedVIN");
var suggestedVin = suggestedVinNode?[0]?.InnerText ?? string.Empty;
var vinNode = xmlDoc.SelectNodes(@"//VIN");
var vin = vinNode?[0]?.InnerText ?? string.Empty;
xmlDoc = null;
/* Optionally Auto-correct VIN numbers */
var vinWasAutoCorrected = false;
var originalVin = string.Empty;
if (autoCorrect)
{
if (vinNode != null && !string.IsNullOrWhiteSpace(suggestedVin))
{
/* Limit auto-correcting the VIN to errors indicating a problem with a single digit */
if (error.StartsWith("2") || error.StartsWith("3") || error.StartsWith("4"))
{
originalVin = vin;
vinNode[0].InnerText = suggestedVin;
vinWasAutoCorrected = true;
}
}
}
/* Optionally Discard invalid VIN data */
if (discardInvalid)
{
if (message == "Invalid URL" || error.StartsWith("11"))
{
return default;
}
}
/* Get the values for the data row from the API result */
var vinItems = (from XmlNode node in nodes select node.InnerText).ToList();
/* Add additional columns to the data */
vinItems.Add(message);
vinItems.Add(vinWasAutoCorrected.ToString());
vinItems.Add(originalVin);
return vinItems;
}
public List<string> GetVinColumnHeaders(string uri, string xpath, CancellationToken token)
{
/* Perform a GET against the API and store the raw XML result */
const string testVin = "JH4TB2H26CC000000";
var rawXmlString = ApiRequest(uri, testVin, token);
if (string.IsNullOrWhiteSpace(rawXmlString) || rawXmlString == "exception")
{
return default;
}
/* De-serialize the XML and get the relevant nodes */
var xmlDoc = new XmlDocument();
xmlDoc.LoadXml(rawXmlString);
var nodes = xmlDoc.SelectNodes(xpath);
if (nodes == null || nodes.Count <= 0)
{
return default;
}
/* Get the column names for the data row from the API result */
var headerList = (from XmlNode node in nodes select node.Name).ToList();
/* Add additional column names to the data */
headerList.Add("MessageFromServer");
headerList.Add("AutoCorrectedVIN");
headerList.Add("OriginalVIN");
return headerList;
}
public string ApiRequest(string uriString, string vinNumber, CancellationToken token, int attempts = 3)
{
var uri = uriString.Replace("{VIN}", vinNumber);
while (true)
{
try
{
if (token.IsCancellationRequested)
{
return string.Empty;
}
attempts--;
return _client.GetAsync(uri, token).Result.Content.ReadAsStringAsync().Result;
}
catch when (attempts > 0)
{
while (!IsConnectedToInternet())
{
if (token.IsCancellationRequested)
{
return string.Empty;
}
Thread.Sleep(30000);
}
}
}
}
}
}