Check some special cases for URI paths instead of local file paths

Author: jimmylewis

src/LibraryManager.Contracts/FileHelpers.cs

@@ -387,6 +387,12 @@ public static string NormalizePath(string path)
                 return path;
             }
 
+            // If the path is a URI, we don't want to normalize it
+            if (IsHttpUri(path))
+            {
+                return path;
+            }
+
             // net451 does not have the OSPlatform apis to determine if the OS is windows or not.
             // This also does not handle the fact that MacOS can be configured to be either sensitive or insenstive 
             // to the casing.
@@ -400,5 +406,14 @@ public static string NormalizePath(string path)
 
             return Path.GetFullPath(path).TrimEnd(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar);
         }
+
+        /// <summary>
+        /// Determines if the path is an HTTP or HTTPS Uri
+        /// </summary>
+        public static bool IsHttpUri(string path)
+        {
+            return Uri.TryCreate(path, UriKind.Absolute, out Uri uri)
+                && (uri.Scheme == Uri.UriSchemeHttp || uri.Scheme == Uri.UriSchemeHttps);
+        }
     }
 }

src/LibraryManager.Contracts/LibraryInstallationGoalState.cs

@@ -41,6 +41,13 @@ public bool IsAchieved()
         {
             foreach (KeyValuePair<string, string> kvp in InstalledFiles)
             {
+                // If the source file is a remote Uri, we have no way to determine if it matches the installed file.
+                // So we will always reinstall the library in this case.
+                if (FileHelpers.IsHttpUri(kvp.Value))
+                {
+                    return false;
+                }
+
                 var destinationFile = new FileInfo(kvp.Key);
                 var cacheFile = new FileInfo(kvp.Value);