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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_metadata(self, digest, content, mime_type):
 """Get a dictionary representing the metadata embedded in the given content."""


        # XXX: ad-hoc for now, refactor later
        if mime_type.startswith("image/"):
            img = Image.open(BytesIO(content))
            ret = {}
            if not hasattr(img, "_getexif"):
                return {}
            info = img._getexif()
            if not info:
                return {}
            for tag, value in info.items():
                decoded = TAGS.get(tag, tag)
                ret["EXIF:" + str(decoded)] = value
            return ret
        else:
            if mime_type != "application/pdf":
                content = self.to_pdf(digest, content, mime_type)

            with make_temp_file(content) as in_fn:
                try:
                    output = subprocess.check_output(["pdfinfo", in_fn])
                except OSError:
                    logger.error("Conversion failed, probably pdfinfo is not installed")
                    raise

            ret = {}
            for line in output.split(b"\n"):
                if b":" in line:
                    key, value = line.strip().split(b":", 1)
                    key = str(key)
                    ret["PDF:" + key] = str(value.strip(), errors="replace")

            return ret