50 lines
1.6 KiB
JavaScript
50 lines
1.6 KiB
JavaScript
import { fromBase64 } from "@smithy/util-base64";
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export const streamCollector = (stream) => {
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if (typeof Blob === "function" && stream instanceof Blob) {
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return collectBlob(stream);
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}
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return collectStream(stream);
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};
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async function collectBlob(blob) {
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const base64 = await readToBase64(blob);
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const arrayBuffer = fromBase64(base64);
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return new Uint8Array(arrayBuffer);
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}
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async function collectStream(stream) {
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const chunks = [];
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const reader = stream.getReader();
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let isDone = false;
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let length = 0;
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while (!isDone) {
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const { done, value } = await reader.read();
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if (value) {
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chunks.push(value);
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length += value.length;
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}
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isDone = done;
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}
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const collected = new Uint8Array(length);
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let offset = 0;
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for (const chunk of chunks) {
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collected.set(chunk, offset);
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offset += chunk.length;
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}
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return collected;
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}
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function readToBase64(blob) {
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return new Promise((resolve, reject) => {
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const reader = new FileReader();
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reader.onloadend = () => {
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if (reader.readyState !== 2) {
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return reject(new Error("Reader aborted too early"));
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}
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const result = (reader.result ?? "");
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const commaIndex = result.indexOf(",");
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const dataOffset = commaIndex > -1 ? commaIndex + 1 : result.length;
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resolve(result.substring(dataOffset));
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};
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reader.onabort = () => reject(new Error("Read aborted"));
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reader.onerror = () => reject(reader.error);
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reader.readAsDataURL(blob);
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});
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}
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