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Viewing file:     sdk-stream-mixin.browser.js (2.75 KB)      -rw-r--r--

import { streamCollector } from "@smithy/fetch-http-handler";
import { toBase64 } from "@smithy/util-base64";
import { toHex } from "@smithy/util-hex-encoding";
import { toUtf8 } from "@smithy/util-utf8";
const ERR_MSG_STREAM_HAS_BEEN_TRANSFORMED = "The stream has already been transformed.";
export const sdkStreamMixin = (stream) => {
    if (!isBlobInstance(stream) && !isReadableStreamInstance(stream)) {
        const name = stream?.__proto__?.constructor?.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 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 toBase64(buf);
            }
            else if (encoding === "hex") {
                return toHex(buf);
            }
            else if (encoding === undefined || encoding === "utf8" || encoding === "utf-8") {
                return 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}`);
            }
        },
    });
};
const isBlobInstance = (stream) => typeof Blob === "function" && stream instanceof Blob;
const isReadableStreamInstance = (stream) => typeof ReadableStream === "function" && stream instanceof ReadableStream;