Method _perform_urllib_http_request

slack/web/base_client.py:355–444

(self, *, url: str, args: Dict[str, Dict[str, any]])

                    f.close()

    def _perform_urllib_http_request(self, *, url: str, args: Dict[str, Dict[str, any]]) -> Dict[str, any]:
        headers = args["headers"]
        if args["json"]:
            body = json.dumps(args["json"])
            headers["Content-Type"] = "application/json;charset=utf-8"
        elif args["data"]:
            boundary = f"--------------{uuid.uuid4()}"
            sep_boundary = b"\r\n--" + boundary.encode("ascii")
            end_boundary = sep_boundary + b"--\r\n"
            body = io.BytesIO()
            data = args["data"]
            for key, value in data.items():
                readable = getattr(value, "readable", None)
                if readable and value.readable():
                    filename = "Uploaded file"
                    name_attr = getattr(value, "name", None)
                    if name_attr:
                        filename = name_attr.decode("utf-8") if isinstance(name_attr, bytes) else name_attr
                    if "filename" in data:
                        filename = data["filename"]
                    mimetype = mimetypes.guess_type(filename)[0] or "application/octet-stream"
                    title = (
                        f'\r\nContent-Disposition: form-data; name="{key}"; filename="{filename}"\r\n'
                        + f"Content-Type: {mimetype}\r\n"
                    )
                    value = value.read()
                else:
                    title = f'\r\nContent-Disposition: form-data; name="{key}"\r\n'
                    value = str(value).encode("utf-8")
                body.write(sep_boundary)
                body.write(title.encode("utf-8"))
                body.write(b"\r\n")
                body.write(value)

            body.write(end_boundary)
            body = body.getvalue()
            headers["Content-Type"] = f"multipart/form-data; boundary={boundary}"
            headers["Content-Length"] = len(body)
        elif args["params"]:
            body = urlencode(args["params"])
            headers["Content-Type"] = "application/x-www-form-urlencoded"
        else:
            body = None

        if isinstance(body, str):
            body = body.encode("utf-8")

        # NOTE: Intentionally ignore the `http_verb` here
        # Slack APIs accepts any API method requests with POST methods
        try:
            # urllib not only opens http:// or https:// URLs, but also ftp:// and file://.
            # With this it might be possible to open local files on the executing machine
            # which might be a security risk if the URL to open can be manipulated by an external user.
            # (BAN-B310)
            if url.lower().startswith("http"):
                req = Request(method="POST", url=url, data=body, headers=headers)
                opener: Optional[OpenerDirector] = None
                if self.proxy is not None: