125 lines
5 KiB
JavaScript
125 lines
5 KiB
JavaScript
import { fromHex, toHex } from "@smithy/util-hex-encoding";
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import { fromUtf8 } from "@smithy/util-utf8";
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export class HeaderFormatter {
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format(headers) {
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const chunks = [];
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for (const headerName of Object.keys(headers)) {
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const bytes = fromUtf8(headerName);
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chunks.push(Uint8Array.from([bytes.byteLength]), bytes, this.formatHeaderValue(headers[headerName]));
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}
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const out = new Uint8Array(chunks.reduce((carry, bytes) => carry + bytes.byteLength, 0));
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let position = 0;
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for (const chunk of chunks) {
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out.set(chunk, position);
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position += chunk.byteLength;
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}
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return out;
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}
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formatHeaderValue(header) {
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switch (header.type) {
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case "boolean":
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return Uint8Array.from([header.value ? 0 : 1]);
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case "byte":
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return Uint8Array.from([2, header.value]);
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case "short":
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const shortView = new DataView(new ArrayBuffer(3));
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shortView.setUint8(0, 3);
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shortView.setInt16(1, header.value, false);
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return new Uint8Array(shortView.buffer);
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case "integer":
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const intView = new DataView(new ArrayBuffer(5));
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intView.setUint8(0, 4);
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intView.setInt32(1, header.value, false);
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return new Uint8Array(intView.buffer);
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case "long":
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const longBytes = new Uint8Array(9);
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longBytes[0] = 5;
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longBytes.set(header.value.bytes, 1);
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return longBytes;
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case "binary":
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const binView = new DataView(new ArrayBuffer(3 + header.value.byteLength));
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binView.setUint8(0, 6);
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binView.setUint16(1, header.value.byteLength, false);
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const binBytes = new Uint8Array(binView.buffer);
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binBytes.set(header.value, 3);
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return binBytes;
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case "string":
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const utf8Bytes = fromUtf8(header.value);
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const strView = new DataView(new ArrayBuffer(3 + utf8Bytes.byteLength));
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strView.setUint8(0, 7);
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strView.setUint16(1, utf8Bytes.byteLength, false);
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const strBytes = new Uint8Array(strView.buffer);
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strBytes.set(utf8Bytes, 3);
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return strBytes;
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case "timestamp":
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const tsBytes = new Uint8Array(9);
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tsBytes[0] = 8;
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tsBytes.set(Int64.fromNumber(header.value.valueOf()).bytes, 1);
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return tsBytes;
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case "uuid":
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if (!UUID_PATTERN.test(header.value)) {
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throw new Error(`Invalid UUID received: ${header.value}`);
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}
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const uuidBytes = new Uint8Array(17);
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uuidBytes[0] = 9;
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uuidBytes.set(fromHex(header.value.replace(/\-/g, "")), 1);
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return uuidBytes;
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}
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}
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}
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var HEADER_VALUE_TYPE;
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(function (HEADER_VALUE_TYPE) {
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HEADER_VALUE_TYPE[HEADER_VALUE_TYPE["boolTrue"] = 0] = "boolTrue";
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HEADER_VALUE_TYPE[HEADER_VALUE_TYPE["boolFalse"] = 1] = "boolFalse";
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HEADER_VALUE_TYPE[HEADER_VALUE_TYPE["byte"] = 2] = "byte";
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HEADER_VALUE_TYPE[HEADER_VALUE_TYPE["short"] = 3] = "short";
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HEADER_VALUE_TYPE[HEADER_VALUE_TYPE["integer"] = 4] = "integer";
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HEADER_VALUE_TYPE[HEADER_VALUE_TYPE["long"] = 5] = "long";
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HEADER_VALUE_TYPE[HEADER_VALUE_TYPE["byteArray"] = 6] = "byteArray";
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HEADER_VALUE_TYPE[HEADER_VALUE_TYPE["string"] = 7] = "string";
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HEADER_VALUE_TYPE[HEADER_VALUE_TYPE["timestamp"] = 8] = "timestamp";
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HEADER_VALUE_TYPE[HEADER_VALUE_TYPE["uuid"] = 9] = "uuid";
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})(HEADER_VALUE_TYPE || (HEADER_VALUE_TYPE = {}));
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const UUID_PATTERN = /^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}$/;
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export class Int64 {
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constructor(bytes) {
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this.bytes = bytes;
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if (bytes.byteLength !== 8) {
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throw new Error("Int64 buffers must be exactly 8 bytes");
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}
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}
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static fromNumber(number) {
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if (number > 9223372036854776000 || number < -9223372036854776000) {
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throw new Error(`${number} is too large (or, if negative, too small) to represent as an Int64`);
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}
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const bytes = new Uint8Array(8);
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for (let i = 7, remaining = Math.abs(Math.round(number)); i > -1 && remaining > 0; i--, remaining /= 256) {
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bytes[i] = remaining;
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}
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if (number < 0) {
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negate(bytes);
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}
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return new Int64(bytes);
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}
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valueOf() {
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const bytes = this.bytes.slice(0);
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const negative = bytes[0] & 0b10000000;
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if (negative) {
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negate(bytes);
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}
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return parseInt(toHex(bytes), 16) * (negative ? -1 : 1);
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}
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toString() {
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return String(this.valueOf());
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}
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}
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function negate(bytes) {
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for (let i = 0; i < 8; i++) {
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bytes[i] ^= 0xff;
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}
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for (let i = 7; i > -1; i--) {
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bytes[i]++;
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if (bytes[i] !== 0)
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break;
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}
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}
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