Fix missing signature key error when pulling Docker images with SERVE_DIRECT enabled (#32365)

Fix #28121

I did some tests and found that the `missing signature key` error is
caused by an incorrect `Content-Type` header. Gitea correctly sets the
`Content-Type` header when serving files.

https://github.com/go-gitea/gitea/blob/348d1d0f322ca57c459acd902f54821d687ca804/routers/api/packages/container/container.go#L712-L717
However, when `SERVE_DIRECT` is enabled, the `Content-Type` header may
be set to an incorrect value by the storage service. To fix this issue,
we can use query parameters to override response header values.

https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetObject.html
<img width="600px"
src="https://github.com/user-attachments/assets/f2ff90f0-f1df-46f9-9680-b8120222c555"
/>

In this PR, I introduced a new parameter to the `URL` method to support
additional parameters.

```
URL(path, name string, reqParams url.Values) (*url.URL, error)
```

---

Most S3-like services support specifying the content type when storing
objects. However, Gitea always use `application/octet-stream`.
Therefore, I believe we also need to improve the `Save` method to
support storing objects with the correct content type.

https://github.com/go-gitea/gitea/blob/b7fb20e73e63b8edc9b90c52073e248bef428fcc/modules/storage/minio.go#L214-L221

Author: Zettat123

Diff for: modules/packages/content_store.go

@@ -37,8 +37,8 @@ func (s *ContentStore) ShouldServeDirect() bool {
 	return setting.Packages.Storage.ServeDirect()
 }
 
-func (s *ContentStore) GetServeDirectURL(key BlobHash256Key, filename string) (*url.URL, error) {
-	return s.store.URL(KeyToRelativePath(key), filename)
+func (s *ContentStore) GetServeDirectURL(key BlobHash256Key, filename string, reqParams url.Values) (*url.URL, error) {
+	return s.store.URL(KeyToRelativePath(key), filename, reqParams)
 }
 
 // FIXME: Workaround to be removed in v1.20

Diff for: modules/storage/azureblob.go

@@ -247,7 +247,7 @@ func (a *AzureBlobStorage) Delete(path string) error {
 }
 
 // URL gets the redirect URL to a file. The presigned link is valid for 5 minutes.
-func (a *AzureBlobStorage) URL(path, name string) (*url.URL, error) {
+func (a *AzureBlobStorage) URL(path, name string, reqParams url.Values) (*url.URL, error) {
 	blobClient := a.getBlobClient(path)
 
 	startTime := time.Now()

Diff for: modules/storage/helper.go

@@ -30,7 +30,7 @@ func (s discardStorage) Delete(_ string) error {
 	return fmt.Errorf("%s", s)
 }
 
-func (s discardStorage) URL(_, _ string) (*url.URL, error) {
+func (s discardStorage) URL(_, _ string, _ url.Values) (*url.URL, error) {
 	return nil, fmt.Errorf("%s", s)
 }
 

Diff for: modules/storage/helper_test.go

@@ -37,7 +37,7 @@ func Test_discardStorage(t *testing.T) {
 				assert.Error(t, err, string(tt))
 			}
 			{
-				got, err := tt.URL("path", "name")
+				got, err := tt.URL("path", "name", nil)
 				assert.Nil(t, got)
 				assert.Errorf(t, err, string(tt))
 			}

Diff for: modules/storage/local.go

@@ -114,7 +114,7 @@ func (l *LocalStorage) Delete(path string) error {
 }
 
 // URL gets the redirect URL to a file
-func (l *LocalStorage) URL(path, name string) (*url.URL, error) {
+func (l *LocalStorage) URL(path, name string, reqParams url.Values) (*url.URL, error) {
 	return nil, ErrURLNotSupported
 }
 

Diff for: modules/storage/minio.go

@@ -276,8 +276,12 @@ func (m *MinioStorage) Delete(path string) error {
 }
 
 // URL gets the redirect URL to a file. The presigned link is valid for 5 minutes.
-func (m *MinioStorage) URL(path, name string) (*url.URL, error) {
-	reqParams := make(url.Values)
+func (m *MinioStorage) URL(path, name string, serveDirectReqParams url.Values) (*url.URL, error) {
+	// copy serveDirectReqParams
+	reqParams, err := url.ParseQuery(serveDirectReqParams.Encode())
+	if err != nil {
+		return nil, err
+	}
 	// TODO it may be good to embed images with 'inline' like ServeData does, but we don't want to have to read the file, do we?
 	reqParams.Set("response-content-disposition", "attachment; filename=\""+quoteEscaper.Replace(name)+"\"")
 	u, err := m.client.PresignedGetObject(m.ctx, m.bucket, m.buildMinioPath(path), 5*time.Minute, reqParams)

Diff for: modules/storage/storage.go

@@ -63,7 +63,7 @@ type ObjectStorage interface {
 	Save(path string, r io.Reader, size int64) (int64, error)
 	Stat(path string) (os.FileInfo, error)
 	Delete(path string) error
-	URL(path, name string) (*url.URL, error)
+	URL(path, name string, reqParams url.Values) (*url.URL, error)
 	IterateObjects(path string, iterator func(path string, obj Object) error) error
 }
 

Diff for: routers/api/actions/artifacts.go

@@ -425,7 +425,7 @@ func (ar artifactRoutes) getDownloadArtifactURL(ctx *ArtifactContext) {
 	for _, artifact := range artifacts {
 		var downloadURL string
 		if setting.Actions.ArtifactStorage.ServeDirect() {
-			u, err := ar.fs.URL(artifact.StoragePath, artifact.ArtifactName)
+			u, err := ar.fs.URL(artifact.StoragePath, artifact.ArtifactName, nil)
 			if err != nil && !errors.Is(err, storage.ErrURLNotSupported) {
 				log.Error("Error getting serve direct url: %v", err)
 			}

Diff for: routers/api/actions/artifactsv4.go

@@ -517,7 +517,7 @@ func (r *artifactV4Routes) getSignedArtifactURL(ctx *ArtifactContext) {
 	respData := GetSignedArtifactURLResponse{}
 
 	if setting.Actions.ArtifactStorage.ServeDirect() {
-		u, err := storage.ActionsArtifacts.URL(artifact.StoragePath, artifact.ArtifactPath)
+		u, err := storage.ActionsArtifacts.URL(artifact.StoragePath, artifact.ArtifactPath, nil)
 		if u != nil && err == nil {
 			respData.SignedUrl = u.String()
 		}

Diff for: routers/api/packages/container/container.go

@@ -703,7 +703,9 @@ func DeleteManifest(ctx *context.Context) {
 }
 
 func serveBlob(ctx *context.Context, pfd *packages_model.PackageFileDescriptor) {
-	s, u, _, err := packages_service.GetPackageBlobStream(ctx, pfd.File, pfd.Blob)
+	serveDirectReqParams := make(url.Values)
+	serveDirectReqParams.Set("response-content-type", pfd.Properties.GetByName(container_module.PropertyMediaType))
+	s, u, _, err := packages_service.GetPackageBlobStream(ctx, pfd.File, pfd.Blob, serveDirectReqParams)
 	if err != nil {
 		apiError(ctx, http.StatusInternalServerError, err)
 		return

Diff for: routers/api/packages/maven/maven.go

@@ -215,7 +215,7 @@ func servePackageFile(ctx *context.Context, params parameters, serveContent bool
 		return
 	}
 
-	s, u, _, err := packages_service.GetPackageBlobStream(ctx, pf, pb)
+	s, u, _, err := packages_service.GetPackageBlobStream(ctx, pf, pb, nil)
 	if err != nil {
 		apiError(ctx, http.StatusInternalServerError, err)
 		return

Diff for: routers/api/v1/repo/file.go

@@ -209,7 +209,7 @@ func GetRawFileOrLFS(ctx *context.APIContext) {
 
 	if setting.LFS.Storage.ServeDirect() {
 		// If we have a signed url (S3, object storage), redirect to this directly.
-		u, err := storage.LFS.URL(pointer.RelativePath(), blob.Name())
+		u, err := storage.LFS.URL(pointer.RelativePath(), blob.Name(), nil)
 		if u != nil && err == nil {
 			ctx.Redirect(u.String())
 			return
@@ -334,7 +334,7 @@ func download(ctx *context.APIContext, archiveName string, archiver *repo_model.
 	rPath := archiver.RelativePath()
 	if setting.RepoArchive.Storage.ServeDirect() {
 		// If we have a signed url (S3, object storage), redirect to this directly.
-		u, err := storage.RepoArchives.URL(rPath, downloadName)
+		u, err := storage.RepoArchives.URL(rPath, downloadName, nil)
 		if u != nil && err == nil {
 			ctx.Redirect(u.String())
 			return

Diff for: routers/web/base.go

@@ -39,7 +39,7 @@ func storageHandler(storageSetting *setting.Storage, prefix string, objStore sto
 			rPath := strings.TrimPrefix(req.URL.Path, "/"+prefix+"/")
 			rPath = util.PathJoinRelX(rPath)
 
-			u, err := objStore.URL(rPath, path.Base(rPath))
+			u, err := objStore.URL(rPath, path.Base(rPath), nil)
 			if err != nil {
 				if os.IsNotExist(err) || errors.Is(err, os.ErrNotExist) {
 					log.Warn("Unable to find %s %s", prefix, rPath)

Diff for: routers/web/repo/actions/view.go

@@ -663,7 +663,7 @@ func ArtifactsDownloadView(ctx *context_module.Context) {
 	if len(artifacts) == 1 && artifacts[0].ArtifactName+".zip" == artifacts[0].ArtifactPath && artifacts[0].ContentEncoding == "application/zip" {
 		art := artifacts[0]
 		if setting.Actions.ArtifactStorage.ServeDirect() {
-			u, err := storage.ActionsArtifacts.URL(art.StoragePath, art.ArtifactPath)
+			u, err := storage.ActionsArtifacts.URL(art.StoragePath, art.ArtifactPath, nil)
 			if u != nil && err == nil {
 				ctx.Redirect(u.String())
 				return

Diff for: routers/web/repo/attachment.go

@@ -129,7 +129,7 @@ func ServeAttachment(ctx *context.Context, uuid string) {
 
 	if setting.Attachment.Storage.ServeDirect() {
 		// If we have a signed url (S3, object storage), redirect to this directly.
-		u, err := storage.Attachments.URL(attach.RelativePath(), attach.Name)
+		u, err := storage.Attachments.URL(attach.RelativePath(), attach.Name, nil)
 
 		if u != nil && err == nil {
 			ctx.Redirect(u.String())

Diff for: routers/web/repo/download.go

@@ -55,7 +55,7 @@ func ServeBlobOrLFS(ctx *context.Context, blob *git.Blob, lastModified *time.Tim
 
 		if setting.LFS.Storage.ServeDirect() {
 			// If we have a signed url (S3, object storage, blob storage), redirect to this directly.
-			u, err := storage.LFS.URL(pointer.RelativePath(), blob.Name())
+			u, err := storage.LFS.URL(pointer.RelativePath(), blob.Name(), nil)
 			if u != nil && err == nil {
 				ctx.Redirect(u.String())
 				return nil

Diff for: routers/web/repo/repo.go

@@ -494,7 +494,7 @@ func download(ctx *context.Context, archiveName string, archiver *repo_model.Rep
 	rPath := archiver.RelativePath()
 	if setting.RepoArchive.Storage.ServeDirect() {
 		// If we have a signed url (S3, object storage), redirect to this directly.
-		u, err := storage.RepoArchives.URL(rPath, downloadName)
+		u, err := storage.RepoArchives.URL(rPath, downloadName, nil)
 		if u != nil && err == nil {
 			ctx.Redirect(u.String())
 			return

Diff for: services/lfs/server.go

@@ -460,7 +460,7 @@ func buildObjectResponse(rc *requestContext, pointer lfs_module.Pointer, downloa
 			var link *lfs_module.Link
 			if setting.LFS.Storage.ServeDirect() {
 				// If we have a signed url (S3, object storage), redirect to this directly.
-				u, err := storage.LFS.URL(pointer.RelativePath(), pointer.Oid)
+				u, err := storage.LFS.URL(pointer.RelativePath(), pointer.Oid, nil)
 				if u != nil && err == nil {
 					// Presigned url does not need the Authorization header
 					// https://github.com/go-gitea/gitea/issues/21525

Diff for: services/packages/packages.go

@@ -596,12 +596,12 @@ func GetPackageFileStream(ctx context.Context, pf *packages_model.PackageFile) (
 		return nil, nil, nil, err
 	}
 
-	return GetPackageBlobStream(ctx, pf, pb)
+	return GetPackageBlobStream(ctx, pf, pb, nil)
 }
 
 // GetPackageBlobStream returns the content of the specific package blob
 // If the storage supports direct serving and it's enabled, only the direct serving url is returned.
-func GetPackageBlobStream(ctx context.Context, pf *packages_model.PackageFile, pb *packages_model.PackageBlob) (io.ReadSeekCloser, *url.URL, *packages_model.PackageFile, error) {
+func GetPackageBlobStream(ctx context.Context, pf *packages_model.PackageFile, pb *packages_model.PackageBlob, serveDirectReqParams url.Values) (io.ReadSeekCloser, *url.URL, *packages_model.PackageFile, error) {
 	key := packages_module.BlobHash256Key(pb.HashSHA256)
 
 	cs := packages_module.NewContentStore()
@@ -611,7 +611,7 @@ func GetPackageBlobStream(ctx context.Context, pf *packages_model.PackageFile, p
 	var err error
 
 	if cs.ShouldServeDirect() {
-		u, err = cs.GetServeDirectURL(key, pf.Name)
+		u, err = cs.GetServeDirectURL(key, pf.Name, serveDirectReqParams)
 		if err != nil && !errors.Is(err, storage.ErrURLNotSupported) {
 			log.Error("Error getting serve direct url: %v", err)
 		}