@specprotected/spec-proxy-fastly-worker/dist/index.js

Spec Proxy implementation for Fastly Compute@Edge Workers

"use strict";
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    if (mod && mod.__esModule) return mod;
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var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
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    return new (P || (P = Promise))(function (resolve, reject) {
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        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.specProxyProcess = exports.specProxyProcessResponse = exports.specProxyProcessRequest = exports.addFastlyBackend = exports.setFastlyBackends = void 0;
const spec = __importStar(require("@specprotected/spec-proxy-service-worker"));
const fastly_backend_1 = require("fastly:backend");
let backendMap;
function setFastlyBackends(map) {
    backendMap = map;
}
exports.setFastlyBackends = setFastlyBackends;
function addFastlyBackend(host, backend) {
    backendMap[host] = backend;
}
exports.addFastlyBackend = addFastlyBackend;
class FastlyRequest extends Request {
    constructor(input, init, original, config) {
        let url;
        if (typeof input === "string") {
            url = new URL(input);
        }
        else {
            url = new URL(input.url);
        }
        let backend;
        if (config === null || config === void 0 ? void 0 : config.dynamicBackends) {
            let host = null;
            let headers = new Headers((init === null || init === void 0 ? void 0 : init.headers) || (original === null || original === void 0 ? void 0 : original.headers));
            if (config === null || config === void 0 ? void 0 : config.alternateHostHeader) {
                host = headers.get(config.alternateHostHeader);
            }
            else {
                host = headers.get("host");
            }
            host = replaceHost(host, config === null || config === void 0 ? void 0 : config.hostReplacements);
            if (host && url.hostname.endsWith(".spec-internal.com")) {
                host += ".spec-internal.com";
            }
            else {
                host = url.hostname;
            }
            backend = new fastly_backend_1.Backend({
                name: `${host}_dynamic_backend`,
                target: host,
                hostOverride: host,
                certificateHostname: host,
                sniHostname: host,
                useSSL: true,
                tlsMinVersion: 1.3,
                tlsMaxVersion: 1.3,
            });
        }
        else {
            backend = backendMap[url.hostname];
        }
        init = Object.assign(Object.assign({}, init), {
            backend,
            cacheOverride: original === null || original === void 0 ? void 0 : original.cacheOverride,
        });
        super(input, init);
    }
}
function specProxyProcessRequest(event, config = {}) {
    if (config === null || config === void 0 ? void 0 : config.disableSpecProxy) {
        let request = event.request;
        return new FastlyRequest(request.url, {
            body: request.body,
            headers: request.headers,
            method: request.method,
            redirect: request.redirect,
        }, request, config);
    }
    return spec.specProxyProcessRequest(event, config, FastlyRequest);
}
exports.specProxyProcessRequest = specProxyProcessRequest;
function specProxyProcessResponse(request, response) {
    return spec.specProxyProcessResponse(request, response);
}
exports.specProxyProcessResponse = specProxyProcessResponse;
function specProxyProcess(event, config) {
    return __awaiter(this, void 0, void 0, function* () {
        return spec.specProxyProcess(event, config, FastlyRequest);
    });
}
exports.specProxyProcess = specProxyProcess;
function replaceHost(host, replacements) {
    if (!host || !replacements) {
        return host;
    }
    for (let replacement of replacements) {
        if (replacement.regex) {
            let pattern = new RegExp(replacement.find);
            if (host.search(pattern) >= 0) {
                return host.replace(pattern, replacement.replace);
            }
        }
        else if (host.indexOf(replacement.find) >= 0) {
            return host.replace(replacement.find, replacement.replace);
        }
    }
    return host;
}
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