Fix tests and add size validation to rust

src/lib-csharp/UpdateManager.cs

@@ -236,19 +236,13 @@ namespace Velopack
             var completeFile = Locator.GetLocalPackagePath(targetRelease);
             var incompleteFile = completeFile + ".partial";
             
-            try {
-                // if the package already exists on disk, we can skip the download.
-                if (File.Exists(completeFile)) {
-                    Log.Info($"Package already exists on disk: '{completeFile}', verifying checksum...");
-                    try {
-                        VerifyPackageChecksum(targetRelease, completeFile);
-                        Log.Info("Package checksum verified, skipping download.");
-                        return;
-                    } catch (ChecksumFailedException ex) {
-                        Log.Warn(ex, $"Checksum failed for file '{completeFile}'. Deleting and starting over.");
-                    }
-                }
+            // if the package already exists on disk, we can skip the download.
+            if (File.Exists(completeFile)) {
+                Log.Info($"Package already exists on disk: '{completeFile}', nothing to do.");
+                return;
+            }
 
+            try {
                 var deltasSize = updates.DeltasToTarget.Sum(x => x.Size);
                 var deltasCount = updates.DeltasToTarget.Count();
 

src/lib-rust/src/lib.rs

@@ -127,8 +127,10 @@ pub enum Error
     FileNotFound(String),
     #[error("IO error: {0}")]
     Io(#[from] std::io::Error),
-    #[error("Checusum did not match for {0} (expected {1}, actual {2})")]
-    Checksum(String, String, String),
+    #[error("Checksum did not match for {0} (expected {1}, actual {2})")]
+    ChecksumInvalid(String, String, String),
+    #[error("Size did not match for {0} (expected {1}, actual {2})")]
+    SizeInvalid(String, u64, u64),
     #[error("Zip error: {0}")]
     Zip(#[from] zip::result::ZipError),
     #[error("Network error: {0}")]

src/lib-rust/src/manager.rs

@@ -519,10 +519,16 @@ impl UpdateManager {
     }
 
     fn verify_package_checksum(&self, file: &PathBuf, asset: &VelopackAsset) -> Result<(), Error> {
+        let file_size = file.metadata()?.len();
+        if file_size != asset.Size {
+            error!("File size mismatch for file '{}': expected {}, got {}", file.to_string_lossy(), asset.Size, file_size);
+            return Err(Error::SizeInvalid(file.to_string_lossy().to_string(), asset.Size, file_size));
+        }
+
         let sha1 = util::calculate_file_sha1(file)?;
         if !sha1.eq_ignore_ascii_case(&asset.SHA1) {
             error!("SHA1 checksum mismatch for file '{}': expected '{}', got '{}'", file.to_string_lossy(), asset.SHA1, sha1);
-            return Err(Error::Checksum(file.to_string_lossy().to_string(), asset.SHA1.clone(), sha1));
+            return Err(Error::ChecksumInvalid(file.to_string_lossy().to_string(), asset.SHA1.clone(), sha1));
         }
         Ok(())
     }

test/Velopack.Tests/UpdateManagerTests.cs

@@ -144,6 +144,31 @@ public class UpdateManagerTests
         Assert.Equal("https://mysite.com/releases/AvaloniaCrossPlat$-1.1.0.nupkg", dl.LastUrl);
     }
 
+    [Fact]
+    public void DownlaodFullUpdateFromFixtures()
+    {
+        using var logger = _output.BuildLoggerFor<UpdateManagerTests>();
+        using var _1 = TempUtil.GetTempDirectory(out var packagesPath);
+        using var _2 = TempUtil.GetTempDirectory(out var feedPath);
+        
+        var locator = new TestVelopackLocator("MyCoolApp", "1.0.0", packagesPath, logger.ToVelopackLogger());
+        
+        File.Copy(PathHelper.GetFixture("testfeed.json"), Path.Combine(feedPath, "releases.beta.json"), true);
+        File.Copy(PathHelper.GetFixture("AvaloniaCrossPlat-1.0.11-win-full.nupkg"), Path.Combine(feedPath, "AvaloniaCrossPlat-1.0.11-full.nupkg"), true);
+        
+        var options = new UpdateOptions() {
+            ExplicitChannel = "beta",
+            AllowVersionDowngrade = false,
+            MaximumDeltasBeforeFallback = 10,
+        };
+        
+        var um = new UpdateManager(feedPath, options, locator);
+        var updateInfo = um.CheckForUpdates();
+        Assert.NotNull(updateInfo);
+        um.DownloadUpdates(updateInfo);
+        Assert.True(File.Exists(Path.Combine(packagesPath, "AvaloniaCrossPlat-1.0.11-full.nupkg")));
+    }
+
     [Fact]
     public void CheckFromLocal()
     {