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Viewing file:     SignatureV4Base.js (2.97 KB)      -rw-r--r--

import { toHex } from "@smithy/util-hex-encoding";
import { normalizeProvider } from "@smithy/util-middleware";
import { escapeUri } from "@smithy/util-uri-escape";
import { toUint8Array } from "@smithy/util-utf8";
import { getCanonicalQuery } from "./getCanonicalQuery";
import { iso8601 } from "./utilDate";
export class SignatureV4Base {
    service;
    regionProvider;
    credentialProvider;
    sha256;
    uriEscapePath;
    applyChecksum;
    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 = normalizeProvider(region);
        this.credentialProvider = normalizeProvider(credentials);
    }
    createCanonicalRequest(request, canonicalHeaders, payloadHash) {
        const sortedHeaders = Object.keys(canonicalHeaders).sort();
        return `${request.method}
${this.getCanonicalPath(request)}
${getCanonicalQuery(request)}
${sortedHeaders.map((name) => `${name}:${canonicalHeaders[name]}`).join("\n")}

${sortedHeaders.join(";")}
${payloadHash}`;
    }
    async createStringToSign(longDate, credentialScope, canonicalRequest, algorithmIdentifier) {
        const hash = new this.sha256();
        hash.update(toUint8Array(canonicalRequest));
        const hashedRequest = await hash.digest();
        return `${algorithmIdentifier}
${longDate}
${credentialScope}
${toHex(hashedRequest)}`;
    }
    getCanonicalPath({ path }) {
        if (this.uriEscapePath) {
            const normalizedPathSegments = [];
            for (const pathSegment of path.split("/")) {
                if (pathSegment?.length === 0)
                    continue;
                if (pathSegment === ".")
                    continue;
                if (pathSegment === "..") {
                    normalizedPathSegments.pop();
                }
                else {
                    normalizedPathSegments.push(pathSegment);
                }
            }
            const normalizedPath = `${path?.startsWith("/") ? "/" : ""}${normalizedPathSegments.join("/")}${normalizedPathSegments.length > 0 && path?.endsWith("/") ? "/" : ""}`;
            const doubleEncoded = escapeUri(normalizedPath);
            return doubleEncoded.replace(/%2F/g, "/");
        }
        return path;
    }
    validateResolvedCredentials(credentials) {
        if (typeof credentials !== "object" ||
            typeof credentials.accessKeyId !== "string" ||
            typeof credentials.secretAccessKey !== "string") {
            throw new Error("Resolved credential object is not valid");
        }
    }
    formatDate(now) {
        const longDate = iso8601(now).replace(/[\-:]/g, "");
        return {
            longDate,
            shortDate: longDate.slice(0, 8),
        };
    }
    getCanonicalHeaderList(headers) {
        return Object.keys(headers).sort().join(";");
    }
}