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Viewing file:     SignatureV4.js (9.4 KB)      -rw-r--r--

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.SignatureV4 = void 0;
const util_hex_encoding_1 = require("@aws-sdk/util-hex-encoding");
const util_middleware_1 = require("@aws-sdk/util-middleware");
const constants_1 = require("./constants");
const credentialDerivation_1 = require("./credentialDerivation");
const getCanonicalHeaders_1 = require("./getCanonicalHeaders");
const getCanonicalQuery_1 = require("./getCanonicalQuery");
const getPayloadHash_1 = require("./getPayloadHash");
const headerUtil_1 = require("./headerUtil");
const moveHeadersToQuery_1 = require("./moveHeadersToQuery");
const prepareRequest_1 = require("./prepareRequest");
const utilDate_1 = require("./utilDate");
class SignatureV4 {
    constructor({ applyChecksum, credentials, region, service, sha256, uriEscapePath = true, }) {
        this.service = service;
        this.sha256 = sha256;
        this.uriEscapePath = uriEscapePath;
        this.applyChecksum = typeof applyChecksum === "boolean" ? applyChecksum : true;
        this.regionProvider = (0, util_middleware_1.normalizeProvider)(region);
        this.credentialProvider = (0, util_middleware_1.normalizeProvider)(credentials);
    }
    async presign(originalRequest, options = {}) {
        const { signingDate = new Date(), expiresIn = 3600, unsignableHeaders, unhoistableHeaders, signableHeaders, signingRegion, signingService, } = options;
        const credentials = await this.credentialProvider();
        const region = signingRegion !== null && signingRegion !== void 0 ? signingRegion : (await this.regionProvider());
        const { longDate, shortDate } = formatDate(signingDate);
        if (expiresIn > constants_1.MAX_PRESIGNED_TTL) {
            return Promise.reject("Signature version 4 presigned URLs" + " must have an expiration date less than one week in" + " the future");
        }
        const scope = (0, credentialDerivation_1.createScope)(shortDate, region, signingService !== null && signingService !== void 0 ? signingService : this.service);
        const request = (0, moveHeadersToQuery_1.moveHeadersToQuery)((0, prepareRequest_1.prepareRequest)(originalRequest), { unhoistableHeaders });
        if (credentials.sessionToken) {
            request.query[constants_1.TOKEN_QUERY_PARAM] = credentials.sessionToken;
        }
        request.query[constants_1.ALGORITHM_QUERY_PARAM] = constants_1.ALGORITHM_IDENTIFIER;
        request.query[constants_1.CREDENTIAL_QUERY_PARAM] = `${credentials.accessKeyId}/${scope}`;
        request.query[constants_1.AMZ_DATE_QUERY_PARAM] = longDate;
        request.query[constants_1.EXPIRES_QUERY_PARAM] = expiresIn.toString(10);
        const canonicalHeaders = (0, getCanonicalHeaders_1.getCanonicalHeaders)(request, unsignableHeaders, signableHeaders);
        request.query[constants_1.SIGNED_HEADERS_QUERY_PARAM] = getCanonicalHeaderList(canonicalHeaders);
        request.query[constants_1.SIGNATURE_QUERY_PARAM] = await this.getSignature(longDate, scope, this.getSigningKey(credentials, region, shortDate, signingService), this.createCanonicalRequest(request, canonicalHeaders, await (0, getPayloadHash_1.getPayloadHash)(originalRequest, this.sha256)));
        return request;
    }
    async sign(toSign, options) {
        if (typeof toSign === "string") {
            return this.signString(toSign, options);
        }
        else if (toSign.headers && toSign.payload) {
            return this.signEvent(toSign, options);
        }
        else {
            return this.signRequest(toSign, options);
        }
    }
    async signEvent({ headers, payload }, { signingDate = new Date(), priorSignature, signingRegion, signingService }) {
        const region = signingRegion !== null && signingRegion !== void 0 ? signingRegion : (await this.regionProvider());
        const { shortDate, longDate } = formatDate(signingDate);
        const scope = (0, credentialDerivation_1.createScope)(shortDate, region, signingService !== null && signingService !== void 0 ? signingService : this.service);
        const hashedPayload = await (0, getPayloadHash_1.getPayloadHash)({ headers: {}, body: payload }, this.sha256);
        const hash = new this.sha256();
        hash.update(headers);
        const hashedHeaders = (0, util_hex_encoding_1.toHex)(await hash.digest());
        const stringToSign = [
            constants_1.EVENT_ALGORITHM_IDENTIFIER,
            longDate,
            scope,
            priorSignature,
            hashedHeaders,
            hashedPayload,
        ].join("\n");
        return this.signString(stringToSign, { signingDate, signingRegion: region, signingService });
    }
    async signString(stringToSign, { signingDate = new Date(), signingRegion, signingService } = {}) {
        const credentials = await this.credentialProvider();
        const region = signingRegion !== null && signingRegion !== void 0 ? signingRegion : (await this.regionProvider());
        const { shortDate } = formatDate(signingDate);
        const hash = new this.sha256(await this.getSigningKey(credentials, region, shortDate, signingService));
        hash.update(stringToSign);
        return (0, util_hex_encoding_1.toHex)(await hash.digest());
    }
    async signRequest(requestToSign, { signingDate = new Date(), signableHeaders, unsignableHeaders, signingRegion, signingService, } = {}) {
        const credentials = await this.credentialProvider();
        const region = signingRegion !== null && signingRegion !== void 0 ? signingRegion : (await this.regionProvider());
        const request = (0, prepareRequest_1.prepareRequest)(requestToSign);
        const { longDate, shortDate } = formatDate(signingDate);
        const scope = (0, credentialDerivation_1.createScope)(shortDate, region, signingService !== null && signingService !== void 0 ? signingService : this.service);
        request.headers[constants_1.AMZ_DATE_HEADER] = longDate;
        if (credentials.sessionToken) {
            request.headers[constants_1.TOKEN_HEADER] = credentials.sessionToken;
        }
        const payloadHash = await (0, getPayloadHash_1.getPayloadHash)(request, this.sha256);
        if (!(0, headerUtil_1.hasHeader)(constants_1.SHA256_HEADER, request.headers) && this.applyChecksum) {
            request.headers[constants_1.SHA256_HEADER] = payloadHash;
        }
        const canonicalHeaders = (0, getCanonicalHeaders_1.getCanonicalHeaders)(request, unsignableHeaders, signableHeaders);
        const signature = await this.getSignature(longDate, scope, this.getSigningKey(credentials, region, shortDate, signingService), this.createCanonicalRequest(request, canonicalHeaders, payloadHash));
        request.headers[constants_1.AUTH_HEADER] =
            `${constants_1.ALGORITHM_IDENTIFIER} ` +
                `Credential=${credentials.accessKeyId}/${scope}, ` +
                `SignedHeaders=${getCanonicalHeaderList(canonicalHeaders)}, ` +
                `Signature=${signature}`;
        return request;
    }
    createCanonicalRequest(request, canonicalHeaders, payloadHash) {
        const sortedHeaders = Object.keys(canonicalHeaders).sort();
        return `${request.method}
${this.getCanonicalPath(request)}
${(0, getCanonicalQuery_1.getCanonicalQuery)(request)}
${sortedHeaders.map((name) => `${name}:${canonicalHeaders[name]}`).join("\n")}

${sortedHeaders.join(";")}
${payloadHash}`;
    }
    async createStringToSign(longDate, credentialScope, canonicalRequest) {
        const hash = new this.sha256();
        hash.update(canonicalRequest);
        const hashedRequest = await hash.digest();
        return `${constants_1.ALGORITHM_IDENTIFIER}
${longDate}
${credentialScope}
${(0, util_hex_encoding_1.toHex)(hashedRequest)}`;
    }
    getCanonicalPath({ path }) {
        if (this.uriEscapePath) {
            const normalizedPathSegments = [];
            for (const pathSegment of path.split("/")) {
                if ((pathSegment === null || pathSegment === void 0 ? void 0 : pathSegment.length) === 0)
                    continue;
                if (pathSegment === ".")
                    continue;
                if (pathSegment === "..") {
                    normalizedPathSegments.pop();
                }
                else {
                    normalizedPathSegments.push(pathSegment);
                }
            }
            const normalizedPath = `${(path === null || path === void 0 ? void 0 : path.startsWith("/")) ? "/" : ""}${normalizedPathSegments.join("/")}${normalizedPathSegments.length > 0 && (path === null || path === void 0 ? void 0 : path.endsWith("/")) ? "/" : ""}`;
            const doubleEncoded = encodeURIComponent(normalizedPath);
            return doubleEncoded.replace(/%2F/g, "/");
        }
        return path;
    }
    async getSignature(longDate, credentialScope, keyPromise, canonicalRequest) {
        const stringToSign = await this.createStringToSign(longDate, credentialScope, canonicalRequest);
        const hash = new this.sha256(await keyPromise);
        hash.update(stringToSign);
        return (0, util_hex_encoding_1.toHex)(await hash.digest());
    }
    getSigningKey(credentials, region, shortDate, service) {
        return (0, credentialDerivation_1.getSigningKey)(this.sha256, credentials, shortDate, region, service || this.service);
    }
}
exports.SignatureV4 = SignatureV4;
const formatDate = (now) => {
    const longDate = (0, utilDate_1.iso8601)(now).replace(/[\-:]/g, "");
    return {
        longDate,
        shortDate: longDate.slice(0, 8),
    };
};
const getCanonicalHeaderList = (headers) => Object.keys(headers).sort().join(";");