Function processDocumentPart

pkg/chat/attach.go:192–210

processDocumentPart handles MessagePartTypeDocument. Images with InlineData are transcoded; other already-resolved documents pass through.

(part MessagePart)

// processDocumentPart handles MessagePartTypeDocument.
// Images with InlineData are transcoded; other already-resolved documents pass through.
func processDocumentPart(part MessagePart) (Document, *ImageResizeResult, error) {
	if part.Document == nil {
		return Document{}, nil, errors.New("ProcessAttachment: document part has nil Document field")
	}
	doc := *part.Document

	if len(doc.Source.InlineData) > 0 {
		if IsImageMimeType(doc.MimeType) {
			return transcodeImageWithMeta(doc.Name, doc.Source.InlineData, doc.MimeType)
		}
		return doc, nil, nil
	}

	if doc.Source.InlineText != "" {
		return doc, nil, nil
	}

	return Document{}, nil, fmt.Errorf("ProcessAttachment: document %q has no inline content (InlineData and InlineText are both empty)", doc.Name)
}

// transcodeImageWithMeta runs bytes through ResizeImage to normalise the image
// to JPEG or PNG within provider limits, then wraps the result in a Document.