node-request-interceptor/lib/RequestInterceptor.js

Low-level HTTP/HTTPS/XHR request interception library for NodeJS

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
var __generator = (this && this.__generator) || function (thisArg, body) {
    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
    function verb(n) { return function (v) { return step([n, v]); }; }
    function step(op) {
        if (f) throw new TypeError("Generator is already executing.");
        while (_) try {
            if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
            if (y = 0, t) op = [op[0] & 2, t.value];
            switch (op[0]) {
                case 0: case 1: t = op; break;
                case 4: _.label++; return { value: op[1], done: false };
                case 5: _.label++; y = op[1]; op = [0]; continue;
                case 7: op = _.ops.pop(); _.trys.pop(); continue;
                default:
                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
                    if (t[2]) _.ops.pop();
                    _.trys.pop(); continue;
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            op = body.call(thisArg, _);
        } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
    }
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.RequestInterceptor = void 0;
var strict_event_emitter_1 = require("strict-event-emitter");
var debug = require('debug')('RequestInterceptor');
var RequestInterceptor = /** @class */ (function () {
    function RequestInterceptor(interceptors) {
        var _this = this;
        this.applyMiddleware = function (req, ref) { return __awaiter(_this, void 0, void 0, function () {
            var _i, _a, requestMiddleware, res;
            return __generator(this, function (_b) {
                switch (_b.label) {
                    case 0:
                        debug('applying middleware...', req);
                        _i = 0, _a = this.middleware;
                        _b.label = 1;
                    case 1:
                        if (!(_i < _a.length)) return [3 /*break*/, 4];
                        requestMiddleware = _a[_i];
                        return [4 /*yield*/, requestMiddleware(req, ref)];
                    case 2:
                        res = _b.sent();
                        if (res) {
                            return [2 /*return*/, res];
                        }
                        _b.label = 3;
                    case 3:
                        _i++;
                        return [3 /*break*/, 1];
                    case 4: return [2 /*return*/];
                }
            });
        }); };
        this.emitter = new strict_event_emitter_1.StrictEventEmitter();
        this.middleware = [];
        debug('created new RequestInterceptor', { interceptors: interceptors });
        this.interceptors = interceptors.map(function (interceptor) {
            return interceptor(_this.applyMiddleware, {
                emitter: _this.emitter,
            });
        });
    }
    /**
     * Applies given request middleware to any intercepted request.
     */
    RequestInterceptor.prototype.use = function (requestMiddleware) {
        debug('use', requestMiddleware);
        this.middleware.push(requestMiddleware);
    };
    RequestInterceptor.prototype.on = function (eventType, listener) {
        this.emitter.addListener(eventType, listener);
    };
    /**
     * Restores original instances of patched modules.
     */
    RequestInterceptor.prototype.restore = function () {
        debug('restore');
        this.emitter.removeAllListeners();
        this.interceptors.forEach(function (restore) { return restore(); });
    };
    return RequestInterceptor;
}());
exports.RequestInterceptor = RequestInterceptor;
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