Feature/595 outdated link to web platform download installer in prerequisites.json file

src/SIM.Sitecore9Installer/SIM.Sitecore9Installer.csproj

@@ -128,6 +128,7 @@
     <Compile Include="Validation\Validators\AppPoolSiteValidator.cs" />
     <Compile Include="Validation\Validators\CmDdsPatchSiteNameValidator.cs" />
     <Compile Include="Validation\Validators\PathExistsValidator.cs" />
+    <Compile Include="Validation\Validators\PrerequisitesDownloadLinksValidator.cs" />
     <Compile Include="Validation\Validators\SolrVersionValidator.cs" />
     <Compile Include="Validation\Validators\SolrServiceValidator.cs" />
     <Compile Include="Validation\Validators\SqlPefixValidator.cs" />

src/SIM.Sitecore9Installer/Validation/Validators/PrerequisitesDownloadLinksValidator.cs

@@ -0,0 +1,88 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Http;
+using SIM.Sitecore9Installer.Tasks;
+
+namespace SIM.Sitecore9Installer.Validation.Validators
+{
+  public class PrerequisitesDownloadLinksValidator : BaseValidator
+  {
+    public override string SuccessMessage => "Prerequisites download links are valid.";
+
+    protected virtual string TaskName => "Prerequisites";
+
+    // parameter to validate the following known issue: https://github.com/Sitecore/Sitecore-Instance-Manager/wiki/Known-Issue-Outdated-Download-Link-to-Microsoft-Web-Platform-Installer
+    public virtual string WebPlatformDownload => "WebPlatformDownload";
+
+    protected override IEnumerable<ValidationResult> GetErrorsForTask(Task task, IEnumerable<InstallParam> paramsToValidate)
+    {
+      string paramNamePostfix = string.Empty;
+      if (this.Data.ContainsKey("ParamNamePostfix"))
+      {
+        paramNamePostfix = this.Data["ParamNamePostfix"];
+      }
+
+      List<string> paramValuePrefixes = new List<string>();
+      if (this.Data.ContainsKey("ParamValuePrefixes"))
+      {
+        paramValuePrefixes = this.Data["ParamValuePrefixes"].Split('|').ToList();
+      }
+
+      if (!string.IsNullOrEmpty(paramNamePostfix) && paramValuePrefixes.Count > 0)
+      {
+        if (task.Name.Equals(TaskName, StringComparison.InvariantCultureIgnoreCase))
+        {
+          foreach (InstallParam installParam in paramsToValidate)
+          {
+            if (paramValuePrefixes.Any(paramValuePrefix => installParam.Value.StartsWith(paramValuePrefix, StringComparison.InvariantCultureIgnoreCase)))
+            {
+              if (!this.IsDownloadLinkValid(installParam.Value))
+              {
+                if (installParam.Name == this.WebPlatformDownload)
+                {
+                  yield return new ValidationResult(ValidatorState.Warning,
+                    $"{TaskName}: the '{installParam.Name}' parameter contains the following invalid link that is not accessible:\n\n{installParam.Value}\n\nThis behavior looks to be related to the following known issue:\n\nhttps://github.com/Sitecore/Sitecore-Instance-Manager/wiki/Known-Issue-Outdated-Download-Link-to-Microsoft-Web-Platform-Installer\n\nPlease try to apply the solution mentioned there.",
+                    null);
+                }
+                else
+                {
+                  yield return new ValidationResult(ValidatorState.Warning,
+                    $"{TaskName}: the '{installParam.Name}' parameter contains the following invalid link that is not accessible:\n\n{installParam.Value}\n\nThis behavior may occur due to similar symptoms described in the following known issue:\n\nhttps://github.com/Sitecore/Sitecore-Instance-Manager/wiki/Known-Issue-Outdated-Download-Link-to-Microsoft-Web-Platform-Installer",
+                    null);
+                }
+              }
+            }
+            else if (installParam.Name.EndsWith(paramNamePostfix, StringComparison.InvariantCultureIgnoreCase))
+            {
+              yield return new ValidationResult(ValidatorState.Warning,
+                $"{TaskName}: the '{installParam.Name}' parameter contains the following invalid value:\n\n{installParam.Value}\n\nIt should contain download link that starts with '{string.Join("' or '", paramValuePrefixes)}'.",
+                null);
+            }
+          }
+        }
+      }
+    }
+
+    private bool IsDownloadLinkValid(string link)
+    {
+      using (HttpClient authClient = new HttpClient())
+      {
+        try
+        {
+          var response = authClient.SendAsync(new HttpRequestMessage(HttpMethod.Head, new Uri(link))).Result;
+          if (response.IsSuccessStatusCode)
+          {
+            return true;
+          }
+        }
+        catch
+        {
+          return false;
+        }
+      }
+
+      return false;
+    }
+  }
+}

src/SIM.Tool/GlobalParamsConfig/Validators.json

@@ -202,6 +202,14 @@
       "Data": {
         "LicenseFileVariable": "LicenseFile"
       }
+    },
+    {
+      "Name": "PrerequisitesDownloadLinksValidator",
+      "Type": "SIM.Sitecore9Installer.Validation.Validators.PrerequisitesDownloadLinksValidator",
+      "Data": {
+        "ParamNamePostfix": "Download",
+        "ParamValuePrefixes": "http://|https://"
+      }
     }
   ],
   "ValidatorLists": {
@@ -241,22 +249,26 @@
     "Sitecore_9.1": [
       "9.1_SqlCompatibilityValidator",
       "9.1_SolrVersionValidator",
-      "CmIdentityServerSiteNameValidator"
+      "CmIdentityServerSiteNameValidator",
+      "PrerequisitesDownloadLinksValidator"
     ],
     "Sitecore_9.2": [
       "9.2_SqlCompatibilityValidator",
       "9.2_SolrVersionValidator",
-      "CmIdentityServerSiteNameValidator"
+      "CmIdentityServerSiteNameValidator",
+      "PrerequisitesDownloadLinksValidator"
     ],
     "Sitecore_9.3": [
       "9.3_SqlCompatibilityValidator",
       "9.3_SolrVersionValidator",
-      "CmIdentityServerSiteNameValidator"
+      "CmIdentityServerSiteNameValidator",
+      "PrerequisitesDownloadLinksValidator"
     ],
     "Sitecore_10.0": [
       "9.3_SqlCompatibilityValidator",
       "10.0_SolrVersionValidator",
-      "CmIdentityServerSiteNameValidator"
+      "CmIdentityServerSiteNameValidator",
+      "PrerequisitesDownloadLinksValidator"
     ]
   }
 }