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Viewing file:     sdk-stream-mixin.browser.js (3.16 KB)      -rw-r--r--

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.sdkStreamMixin = void 0;
const fetch_http_handler_1 = require("@smithy/fetch-http-handler");
const util_base64_1 = require("@smithy/util-base64");
const util_hex_encoding_1 = require("@smithy/util-hex-encoding");
const util_utf8_1 = require("@smithy/util-utf8");
const ERR_MSG_STREAM_HAS_BEEN_TRANSFORMED = "The stream has already been transformed.";
const sdkStreamMixin = (stream) => {
    var _a, _b;
    if (!isBlobInstance(stream) && !isReadableStreamInstance(stream)) {
        const name = ((_b = (_a = stream === null || stream === void 0 ? void 0 : stream.__proto__) === null || _a === void 0 ? void 0 : _a.constructor) === null || _b === void 0 ? void 0 : _b.name) || stream;
        throw new Error(`Unexpected stream implementation, expect Blob or ReadableStream, got ${name}`);
    }
    let transformed = false;
    const transformToByteArray = async () => {
        if (transformed) {
            throw new Error(ERR_MSG_STREAM_HAS_BEEN_TRANSFORMED);
        }
        transformed = true;
        return await (0, fetch_http_handler_1.streamCollector)(stream);
    };
    const blobToWebStream = (blob) => {
        if (typeof blob.stream !== "function") {
            throw new Error("Cannot transform payload Blob to web stream. Please make sure the Blob.stream() is polyfilled.\n" +
                "If you are using React Native, this API is not yet supported, see: https://react-native.canny.io/feature-requests/p/fetch-streaming-body");
        }
        return blob.stream();
    };
    return Object.assign(stream, {
        transformToByteArray: transformToByteArray,
        transformToString: async (encoding) => {
            const buf = await transformToByteArray();
            if (encoding === "base64") {
                return (0, util_base64_1.toBase64)(buf);
            }
            else if (encoding === "hex") {
                return (0, util_hex_encoding_1.toHex)(buf);
            }
            else if (encoding === undefined || encoding === "utf8" || encoding === "utf-8") {
                return (0, util_utf8_1.toUtf8)(buf);
            }
            else if (typeof TextDecoder === "function") {
                return new TextDecoder(encoding).decode(buf);
            }
            else {
                throw new Error("TextDecoder is not available, please make sure polyfill is provided.");
            }
        },
        transformToWebStream: () => {
            if (transformed) {
                throw new Error(ERR_MSG_STREAM_HAS_BEEN_TRANSFORMED);
            }
            transformed = true;
            if (isBlobInstance(stream)) {
                return blobToWebStream(stream);
            }
            else if (isReadableStreamInstance(stream)) {
                return stream;
            }
            else {
                throw new Error(`Cannot transform payload to web stream, got ${stream}`);
            }
        },
    });
};
exports.sdkStreamMixin = sdkStreamMixin;
const isBlobInstance = (stream) => typeof Blob === "function" && stream instanceof Blob;
const isReadableStreamInstance = (stream) => typeof ReadableStream === "function" && stream instanceof ReadableStream;