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Viewing file:     HeaderMarshaller.js (7.65 KB)      -rw-r--r--

import { fromHex, toHex } from "@smithy/util-hex-encoding";
import { Int64 } from "./Int64";
export class HeaderMarshaller {
    constructor(toUtf8, fromUtf8) {
        this.toUtf8 = toUtf8;
        this.fromUtf8 = fromUtf8;
    }
    format(headers) {
        const chunks = [];
        for (const headerName of Object.keys(headers)) {
            const bytes = this.fromUtf8(headerName);
            chunks.push(Uint8Array.from([bytes.byteLength]), bytes, this.formatHeaderValue(headers[headerName]));
        }
        const out = new Uint8Array(chunks.reduce((carry, bytes) => carry + bytes.byteLength, 0));
        let position = 0;
        for (const chunk of chunks) {
            out.set(chunk, position);
            position += chunk.byteLength;
        }
        return out;
    }
    formatHeaderValue(header) {
        switch (header.type) {
            case "boolean":
                return Uint8Array.from([header.value ? 0 : 1]);
            case "byte":
                return Uint8Array.from([2, header.value]);
            case "short":
                const shortView = new DataView(new ArrayBuffer(3));
                shortView.setUint8(0, 3);
                shortView.setInt16(1, header.value, false);
                return new Uint8Array(shortView.buffer);
            case "integer":
                const intView = new DataView(new ArrayBuffer(5));
                intView.setUint8(0, 4);
                intView.setInt32(1, header.value, false);
                return new Uint8Array(intView.buffer);
            case "long":
                const longBytes = new Uint8Array(9);
                longBytes[0] = 5;
                longBytes.set(header.value.bytes, 1);
                return longBytes;
            case "binary":
                const binView = new DataView(new ArrayBuffer(3 + header.value.byteLength));
                binView.setUint8(0, 6);
                binView.setUint16(1, header.value.byteLength, false);
                const binBytes = new Uint8Array(binView.buffer);
                binBytes.set(header.value, 3);
                return binBytes;
            case "string":
                const utf8Bytes = this.fromUtf8(header.value);
                const strView = new DataView(new ArrayBuffer(3 + utf8Bytes.byteLength));
                strView.setUint8(0, 7);
                strView.setUint16(1, utf8Bytes.byteLength, false);
                const strBytes = new Uint8Array(strView.buffer);
                strBytes.set(utf8Bytes, 3);
                return strBytes;
            case "timestamp":
                const tsBytes = new Uint8Array(9);
                tsBytes[0] = 8;
                tsBytes.set(Int64.fromNumber(header.value.valueOf()).bytes, 1);
                return tsBytes;
            case "uuid":
                if (!UUID_PATTERN.test(header.value)) {
                    throw new Error(`Invalid UUID received: ${header.value}`);
                }
                const uuidBytes = new Uint8Array(17);
                uuidBytes[0] = 9;
                uuidBytes.set(fromHex(header.value.replace(/\-/g, "")), 1);
                return uuidBytes;
        }
    }
    parse(headers) {
        const out = {};
        let position = 0;
        while (position < headers.byteLength) {
            const nameLength = headers.getUint8(position++);
            const name = this.toUtf8(new Uint8Array(headers.buffer, headers.byteOffset + position, nameLength));
            position += nameLength;
            switch (headers.getUint8(position++)) {
                case 0:
                    out[name] = {
                        type: BOOLEAN_TAG,
                        value: true,
                    };
                    break;
                case 1:
                    out[name] = {
                        type: BOOLEAN_TAG,
                        value: false,
                    };
                    break;
                case 2:
                    out[name] = {
                        type: BYTE_TAG,
                        value: headers.getInt8(position++),
                    };
                    break;
                case 3:
                    out[name] = {
                        type: SHORT_TAG,
                        value: headers.getInt16(position, false),
                    };
                    position += 2;
                    break;
                case 4:
                    out[name] = {
                        type: INT_TAG,
                        value: headers.getInt32(position, false),
                    };
                    position += 4;
                    break;
                case 5:
                    out[name] = {
                        type: LONG_TAG,
                        value: new Int64(new Uint8Array(headers.buffer, headers.byteOffset + position, 8)),
                    };
                    position += 8;
                    break;
                case 6:
                    const binaryLength = headers.getUint16(position, false);
                    position += 2;
                    out[name] = {
                        type: BINARY_TAG,
                        value: new Uint8Array(headers.buffer, headers.byteOffset + position, binaryLength),
                    };
                    position += binaryLength;
                    break;
                case 7:
                    const stringLength = headers.getUint16(position, false);
                    position += 2;
                    out[name] = {
                        type: STRING_TAG,
                        value: this.toUtf8(new Uint8Array(headers.buffer, headers.byteOffset + position, stringLength)),
                    };
                    position += stringLength;
                    break;
                case 8:
                    out[name] = {
                        type: TIMESTAMP_TAG,
                        value: new Date(new Int64(new Uint8Array(headers.buffer, headers.byteOffset + position, 8)).valueOf()),
                    };
                    position += 8;
                    break;
                case 9:
                    const uuidBytes = new Uint8Array(headers.buffer, headers.byteOffset + position, 16);
                    position += 16;
                    out[name] = {
                        type: UUID_TAG,
                        value: `${toHex(uuidBytes.subarray(0, 4))}-${toHex(uuidBytes.subarray(4, 6))}-${toHex(uuidBytes.subarray(6, 8))}-${toHex(uuidBytes.subarray(8, 10))}-${toHex(uuidBytes.subarray(10))}`,
                    };
                    break;
                default:
                    throw new Error(`Unrecognized header type tag`);
            }
        }
        return out;
    }
}
var HEADER_VALUE_TYPE;
(function (HEADER_VALUE_TYPE) {
    HEADER_VALUE_TYPE[HEADER_VALUE_TYPE["boolTrue"] = 0] = "boolTrue";
    HEADER_VALUE_TYPE[HEADER_VALUE_TYPE["boolFalse"] = 1] = "boolFalse";
    HEADER_VALUE_TYPE[HEADER_VALUE_TYPE["byte"] = 2] = "byte";
    HEADER_VALUE_TYPE[HEADER_VALUE_TYPE["short"] = 3] = "short";
    HEADER_VALUE_TYPE[HEADER_VALUE_TYPE["integer"] = 4] = "integer";
    HEADER_VALUE_TYPE[HEADER_VALUE_TYPE["long"] = 5] = "long";
    HEADER_VALUE_TYPE[HEADER_VALUE_TYPE["byteArray"] = 6] = "byteArray";
    HEADER_VALUE_TYPE[HEADER_VALUE_TYPE["string"] = 7] = "string";
    HEADER_VALUE_TYPE[HEADER_VALUE_TYPE["timestamp"] = 8] = "timestamp";
    HEADER_VALUE_TYPE[HEADER_VALUE_TYPE["uuid"] = 9] = "uuid";
})(HEADER_VALUE_TYPE || (HEADER_VALUE_TYPE = {}));
const BOOLEAN_TAG = "boolean";
const BYTE_TAG = "byte";
const SHORT_TAG = "short";
const INT_TAG = "integer";
const LONG_TAG = "long";
const BINARY_TAG = "binary";
const STRING_TAG = "string";
const TIMESTAMP_TAG = "timestamp";
const UUID_TAG = "uuid";
const UUID_PATTERN = /^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}$/;