langchain/document_loaders/confluence.py/ConfluenceLoader/process_attachment
class ConfluenceLoader:    def process_attachment(self, page_id: str) -> List[str]:
        try:
            from PIL import Image  # noqa: F401
        except ImportError:
            raise ImportError(
                "`Pillow` package not found, " "please run `pip install Pillow`"
            )

        # depending on setup you may also need to set the correct path for
        # poppler and tesseract
        attachments = self.confluence.get_attachments_from_content(page_id)["results"]
        texts = []
        for attachment in attachments:
            media_type = attachment["metadata"]["mediaType"]
            absolute_url = self.base_url + attachment["_links"]["download"]
            title = attachment["title"]
            if media_type == "application/pdf":
                text = title + self.process_pdf(absolute_url)
            elif (
                media_type == "image/png"
                or media_type == "image/jpg"
                or media_type == "image/jpeg"
            ):
                text = title + self.process_image(absolute_url)
            elif (
                media_type == "application/vnd.openxmlformats-officedocument"
                ".wordprocessingml.document"
            ):
                text = title + self.process_doc(absolute_url)
            elif media_type == "application/vnd.ms-excel":
                text = title + self.process_xls(absolute_url)
            elif media_type == "image/svg+xml":
                text = title + self.process_svg(absolute_url)
            else:
                continue
            texts.append(text)

        return texts