Bugfixes and improved alignment with architecture blueprint

internal/artifact/reader.go

@@ -36,6 +36,12 @@ func NewCompositeReader() Reader {
 }
 
 func (c *CompositeReader) Read(ctx context.Context, ref domain.ArtifactRef) (*domain.Artifact, error) {
+	select {
+	case <-ctx.Done():
+		return nil, ctx.Err()
+	default:
+	}
+
 	switch ref.Type {
 	case domain.ArtifactRefInline:
 		return c.inlineReader.Read(ctx, ref)
@@ -49,22 +55,35 @@ func (c *CompositeReader) Read(ctx context.Context, ref domain.ArtifactRef) (*do
 type inlineReader struct{}
 
 func (r *inlineReader) Read(ctx context.Context, ref domain.ArtifactRef) (*domain.Artifact, error) {
+	select {
+	case <-ctx.Done():
+		return nil, ctx.Err()
+	default:
+	}
+
 	if ref.Body == "" {
 		return nil, ErrMissingInlineBody
 	}
 
 	body := []byte(ref.Body)
 	return &domain.Artifact{
-		Body: body,
-		Size: int64(len(body)),
-		Hash: fmt.Sprintf("%x", sha256.Sum256(body)),
-		URI:  ref.URI,
+		ContentType: "text/plain",
+		Body:        body,
+		Size:        int64(len(body)),
+		Hash:        fmt.Sprintf("%x", sha256.Sum256(body)),
+		URI:         ref.URI,
 	}, nil
 }
 
 type fileReader struct{}
 
 func (r *fileReader) Read(ctx context.Context, ref domain.ArtifactRef) (*domain.Artifact, error) {
+	select {
+	case <-ctx.Done():
+		return nil, ctx.Err()
+	default:
+	}
+
 	if ref.URI == "" {
 		return nil, ErrMissingFilePath
 	}