Fix V3 packageContent URL selection to compare parsed versions

src/code/PSResourceInfo.cs

@@ -2023,6 +2023,18 @@ public static void WritePSGetResourceInfo(
 
             throw new PSArgumentException("psObjectGetInfo argument is not a PSGetResourceInfo type.");
         }
+
+        public static string SelectV3PackageContentUrl(
+            string[] versionedResponses,
+            string version)
+        {
+            if (!NuGetVersion.TryParse(version, out NuGetVersion requiredVersion))
+            {
+                throw new PSArgumentException($"Version {version} is not a valid NuGet version.");
+            }
+
+            return Cmdlets.V3ServerAPICalls.GetPackageContentUrlForVersion(versionedResponses, requiredVersion);
+        }
     }
 
     #endregion

src/code/V3ServerAPICalls.cs

@@ -913,17 +913,7 @@ private Stream InstallHelper(string packageName, NuGetVersion version, out Error
             }
             else
             {
-                // loop through responses to find one containing required version
-                foreach (string response in versionedResponses)
-                {
-                    // Response will be "packageContent" element value that looks like: "{packageBaseAddress}/{packageName}/{normalizedVersion}/{packageName}.{normalizedVersion}.nupkg"
-                    // Ex: https://api.nuget.org/v3-flatcontainer/test_module/1.0.0/test_module.1.0.0.nupkg
-                    if (response.Contains(version.ToNormalizedString()))
-                    {
-                        pkgContentUrl = response;
-                        break;
-                    }
-                }
+                pkgContentUrl = GetPackageContentUrlForVersion(versionedResponses, version);
             }
 
             if (String.IsNullOrEmpty(pkgContentUrl))
@@ -997,17 +987,7 @@ private async Task<Stream> InstallHelperAsync(string packageName, NuGetVersion v
             }
             else
             {
-                // loop through responses to find one containing required version
-                foreach (string response in versionedResponses)
-                {
-                    // Response will be "packageContent" element value that looks like: "{packageBaseAddress}/{packageName}/{normalizedVersion}/{packageName}.{normalizedVersion}.nupkg"
-                    // Ex: https://api.nuget.org/v3-flatcontainer/test_module/1.0.0/test_module.1.0.0.nupkg
-                    if (response.Contains(version.ToNormalizedString()))
-                    {
-                        pkgContentUrl = response;
-                        break;
-                    }
-                }
+                pkgContentUrl = GetPackageContentUrlForVersion(versionedResponses, version);
             }
 
             if (String.IsNullOrEmpty(pkgContentUrl))
@@ -1039,6 +1019,101 @@ private async Task<Stream> InstallHelperAsync(string packageName, NuGetVersion v
             return pkgStream;
         }
 
+        /// <summary>
+        /// Selects the "packageContent" entry (i.e the .nupkg download URL) matching the required version.
+        /// The version encoded in the entry is parsed and compared as a NuGetVersion, instead of searching for the version
+        /// text anywhere within the entry, as a substring search matches version prefixes too
+        /// (i.e requesting version '1.2.3' would match the entry for version '1.2.30').
+        /// </summary>
+        internal static string GetPackageContentUrlForVersion(string[] versionedResponses, NuGetVersion requiredVersion)
+        {
+            if (versionedResponses == null || requiredVersion == null)
+            {
+                return String.Empty;
+            }
+
+            foreach (string response in versionedResponses)
+            {
+                if (String.IsNullOrWhiteSpace(response))
+                {
+                    continue;
+                }
+
+                // Response will be "packageContent" element value that looks like: "{packageBaseAddress}/{packageName}/{normalizedVersion}/{packageName}.{normalizedVersion}.nupkg"
+                // Ex: https://api.nuget.org/v3-flatcontainer/test_module/1.0.0/test_module.1.0.0.nupkg
+                if (PackageContentUrlMatchesVersion(response, requiredVersion))
+                {
+                    return response;
+                }
+            }
+
+            return String.Empty;
+        }
+
+        /// <summary>
+        /// Determines whether the given "packageContent" entry refers to the required version.
+        /// </summary>
+        private static bool PackageContentUrlMatchesVersion(string packageContentUrl, NuGetVersion requiredVersion)
+        {
+            string path = packageContentUrl;
+            string query = String.Empty;
+            int queryIndex = path.IndexOfAny(new char[] { '?', '#' });
+            if (queryIndex >= 0)
+            {
+                query = path.Substring(queryIndex + 1);
+                path = path.Substring(0, queryIndex);
+            }
+
+            string[] pathSegments = path.Split(new char[] { '/' }, StringSplitOptions.RemoveEmptyEntries);
+            string normalizedVersion = requiredVersion.ToNormalizedString();
+            for (int i = 0; i < pathSegments.Length; i++)
+            {
+                string segment = UnescapeUrlPart(pathSegments[i]);
+
+                // Path segment containing just the version, ex: ".../test_module/1.0.0/..."
+                if (NuGetVersion.TryParse(segment, out NuGetVersion segmentVersion) && segmentVersion == requiredVersion)
+                {
+                    return true;
+                }
+
+                // Last path segment is the file name, ex: "test_module.1.0.0.nupkg"
+                if (segment.EndsWith($".{normalizedVersion}.nupkg", StringComparison.OrdinalIgnoreCase))
+                {
+                    return true;
+                }
+            }
+
+            // Some repositories pass the version as a query parameter, ex: "...?packageVersion=1.0.0"
+            foreach (string queryParameter in query.Split(new char[] { '&', ';' }, StringSplitOptions.RemoveEmptyEntries))
+            {
+                int separatorIndex = queryParameter.IndexOf('=');
+                if (separatorIndex < 0)
+                {
+                    continue;
+                }
+
+                string queryValue = UnescapeUrlPart(queryParameter.Substring(separatorIndex + 1));
+                if (NuGetVersion.TryParse(queryValue, out NuGetVersion queryVersion) && queryVersion == requiredVersion)
+                {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
+        private static string UnescapeUrlPart(string urlPart)
+        {
+            try
+            {
+                return Uri.UnescapeDataString(urlPart);
+            }
+            catch (UriFormatException)
+            {
+                return urlPart;
+            }
+        }
+
         /// <summary>
         /// Gets the versioned package entries from the RegistrationsBaseUrl resource
         /// i.e when the package Name being searched for does not contain wildcard

test/InstallPSResourceTests/InstallPSResourceV3ServerVersionSelection.Tests.ps1

@@ -0,0 +1,58 @@
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
+
+Import-Module "$psscriptroot/../PSGetTestUtils.psm1" -Force
+
+Describe 'Test V3 packageContent url selection for a required version' -tags 'CI' {
+
+    BeforeAll {
+        $packageBaseAddress = 'https://api.nuget.org/v3-flatcontainer/test_module'
+        # Responses are returned in descending version order, ie the entry for 1.2.30 precedes the entry for 1.2.3
+        $versionedResponses = @(
+            "$packageBaseAddress/1.2.30/test_module.1.2.30.nupkg",
+            "$packageBaseAddress/1.2.3/test_module.1.2.3.nupkg"
+        )
+    }
+
+    It 'Should select the url for the exact version requested' {
+        $url = [Microsoft.PowerShell.PSResourceGet.UtilClasses.TestHooks]::SelectV3PackageContentUrl($versionedResponses, '1.2.3')
+        $url | Should -BeExactly "$packageBaseAddress/1.2.3/test_module.1.2.3.nupkg"
+    }
+
+    It 'Should not select the url of a version which the requested version is a prefix of' {
+        $url = [Microsoft.PowerShell.PSResourceGet.UtilClasses.TestHooks]::SelectV3PackageContentUrl($versionedResponses, '1.2.30')
+        $url | Should -BeExactly "$packageBaseAddress/1.2.30/test_module.1.2.30.nupkg"
+    }
+
+    It 'Should select the url for a version with four version parts' {
+        $responses = @(
+            "$packageBaseAddress/2024.5.20.12/test_module.2024.5.20.12.nupkg",
+            "$packageBaseAddress/2024.5.20.1/test_module.2024.5.20.1.nupkg"
+        )
+        $url = [Microsoft.PowerShell.PSResourceGet.UtilClasses.TestHooks]::SelectV3PackageContentUrl($responses, '2024.5.20.1')
+        $url | Should -BeExactly "$packageBaseAddress/2024.5.20.1/test_module.2024.5.20.1.nupkg"
+    }
+
+    It 'Should select the url for a prerelease version' {
+        $responses = @(
+            "$packageBaseAddress/2.5.0-beta10/test_module.2.5.0-beta10.nupkg",
+            "$packageBaseAddress/2.5.0-beta1/test_module.2.5.0-beta1.nupkg"
+        )
+        $url = [Microsoft.PowerShell.PSResourceGet.UtilClasses.TestHooks]::SelectV3PackageContentUrl($responses, '2.5.0-beta1')
+        $url | Should -BeExactly "$packageBaseAddress/2.5.0-beta1/test_module.2.5.0-beta1.nupkg"
+    }
+
+    It 'Should select the url when the version is passed as a query parameter' {
+        $responses = @(
+            "https://www.myget.org/api/download?packageId=test_module&packageVersion=1.2.30",
+            "https://www.myget.org/api/download?packageId=test_module&packageVersion=1.2.3"
+        )
+        $url = [Microsoft.PowerShell.PSResourceGet.UtilClasses.TestHooks]::SelectV3PackageContentUrl($responses, '1.2.3')
+        $url | Should -BeExactly "https://www.myget.org/api/download?packageId=test_module&packageVersion=1.2.3"
+    }
+
+    It 'Should not select any url when the requested version is not present' {
+        $url = [Microsoft.PowerShell.PSResourceGet.UtilClasses.TestHooks]::SelectV3PackageContentUrl($versionedResponses, '1.2.4')
+        $url | Should -BeNullOrEmpty
+    }
+}