Preserve file size when creating attachments (#23406)

When creating attachments (issue, release, repo) the file size (being
part of the multipart file header) is passed through the chain of
creating an attachment to ensure the MinIO client can stream the file
directly instead of having to read it to memory completely at first.

Fixes #23393

Co-authored-by: KN4CK3R <admin@oldschoolhack.me>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

4 files changed, 11 insertions, 8 deletions

diff --git a/services/attachment/attachment.go b/services/attachment/attachment.go
index 7fdacc6aa..3e7df0cee 100644
--- a/services/attachment/attachment.go
+++ b/services/attachment/attachment.go
@@ -19,14 +19,14 @@ import (
 )
 
 // NewAttachment creates a new attachment object, but do not verify.
-func NewAttachment(attach *repo_model.Attachment, file io.Reader) (*repo_model.Attachment, error) {
+func NewAttachment(attach *repo_model.Attachment, file io.Reader, size int64) (*repo_model.Attachment, error) {
 	if attach.RepoID == 0 {
 		return nil, fmt.Errorf("attachment %s should belong to a repository", attach.Name)
 	}
 
 	err := db.WithTx(db.DefaultContext, func(ctx context.Context) error {
 		attach.UUID = uuid.New().String()
-		size, err := storage.Attachments.Save(attach.RelativePath(), file, -1)
+		size, err := storage.Attachments.Save(attach.RelativePath(), file, size)
 		if err != nil {
 			return fmt.Errorf("Create: %w", err)
 		}
@@ -39,7 +39,7 @@ func NewAttachment(attach *repo_model.Attachment, file io.Reader) (*repo_model.A
 }
 
 // UploadAttachment upload new attachment into storage and update database
-func UploadAttachment(file io.Reader, allowedTypes string, opts *repo_model.Attachment) (*repo_model.Attachment, error) {
+func UploadAttachment(file io.Reader, allowedTypes string, fileSize int64, opts *repo_model.Attachment) (*repo_model.Attachment, error) {
 	buf := make([]byte, 1024)
 	n, _ := util.ReadAtMost(file, buf)
 	buf = buf[:n]
@@ -48,5 +48,5 @@ func UploadAttachment(file io.Reader, allowedTypes string, opts *repo_model.Atta
 		return nil, err
 	}
 
-	return NewAttachment(opts, io.MultiReader(bytes.NewReader(buf), file))
+	return NewAttachment(opts, io.MultiReader(bytes.NewReader(buf), file), fileSize)
 }
diff --git a/services/attachment/attachment_test.go b/services/attachment/attachment_test.go
index 72d1b2ab3..1b9af3442 100644
--- a/services/attachment/attachment_test.go
+++ b/services/attachment/attachment_test.go
@@ -36,7 +36,7 @@ func TestUploadAttachment(t *testing.T) {
 		RepoID:     1,
 		UploaderID: user.ID,
 		Name:       filepath.Base(fPath),
-	}, f)
+	}, f, -1)
 	assert.NoError(t, err)
 
 	attachment, err := repo_model.GetAttachmentByUUID(db.DefaultContext, attach.UUID)
diff --git a/services/mailer/incoming/incoming_handler.go b/services/mailer/incoming/incoming_handler.go
index 454039c60..b594e3518 100644
--- a/services/mailer/incoming/incoming_handler.go
+++ b/services/mailer/incoming/incoming_handler.go
@@ -87,7 +87,7 @@ func (h *ReplyHandler) Handle(ctx context.Context, content *MailContent, doer *u
 		attachmentIDs := make([]string, 0, len(content.Attachments))
 		if setting.Attachment.Enabled {
 			for _, attachment := range content.Attachments {
-				a, err := attachment_service.UploadAttachment(bytes.NewReader(attachment.Content), setting.Attachment.AllowedTypes, &repo_model.Attachment{
+				a, err := attachment_service.UploadAttachment(bytes.NewReader(attachment.Content), setting.Attachment.AllowedTypes, int64(len(attachment.Content)), &repo_model.Attachment{
 					Name:       attachment.Name,
 					UploaderID: doer.ID,
 					RepoID:     issue.Repo.ID,
diff --git a/services/release/release_test.go b/services/release/release_test.go
index 9b8aaa364..805269413 100644
--- a/services/release/release_test.go
+++ b/services/release/release_test.go
@@ -106,11 +106,13 @@ func TestRelease_Create(t *testing.T) {
 		IsTag:        false,
 	}, nil, ""))
 
+	testPlayload := "testtest"
+
 	attach, err := attachment.NewAttachment(&repo_model.Attachment{
 		RepoID:     repo.ID,
 		UploaderID: user.ID,
 		Name:       "test.txt",
-	}, strings.NewReader("testtest"))
+	}, strings.NewReader(testPlayload), int64(len([]byte(testPlayload))))
 	assert.NoError(t, err)
 
 	release := repo_model.Release{
@@ -239,11 +241,12 @@ func TestRelease_Update(t *testing.T) {
 	assert.Equal(t, tagName, release.TagName)
 
 	// Add new attachments
+	samplePayload := "testtest"
 	attach, err := attachment.NewAttachment(&repo_model.Attachment{
 		RepoID:     repo.ID,
 		UploaderID: user.ID,
 		Name:       "test.txt",
-	}, strings.NewReader("testtest"))
+	}, strings.NewReader(samplePayload), int64(len([]byte(samplePayload))))
 	assert.NoError(t, err)
 
 	assert.NoError(t, UpdateRelease(user, gitRepo, release, []string{attach.UUID}, nil, nil))