ask-sdk-express-adapter
Version:
Express adapter package for Alexa Skills Kit SDK
81 lines • 3.37 kB
JavaScript
;
/*
* Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
* http://www.apache.org/licenses/LICENSE-2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.ExpressAdapter = void 0;
const ask_sdk_core_1 = require("ask-sdk-core");
const body_parser_1 = require("body-parser");
const util_1 = require("../util");
const verifier_1 = require("../verifier");
/**
* Express adapter class
*/
class ExpressAdapter {
/**
* Constructor
*
* @param {Skill} skill ask-sdk-core custom skill instance
* @param {boolean} verifySignature boolean flag decide if certificate signature verifier is needed
* @param {boolean} verifyTimeStamp boolean flag decide if timestamp verifier is needed
* @param {Verifier[]} verifiers Array of user customized Verifier instances
*/
constructor(skill, verifySignature = true, verifyTimeStamp = true, verifiers = []) {
this.skill = skill;
this.verifiers = verifiers;
if (!this.skill) {
throw (0, ask_sdk_core_1.createAskSdkError)(this.constructor.name, 'The input skill cannot be empty');
}
skill.appendAdditionalUserAgent('ask-express-adapter');
if (verifySignature) {
verifiers.push(new verifier_1.SkillRequestSignatureVerifier());
}
if (verifyTimeStamp) {
verifiers.push(new verifier_1.TimestampVerifier());
}
}
/**
* Get pre-defined request handlers
*
* This function return an array of pre-defined request handlers
* which are supposed to be registered on users' express application, including:
* 1: text parser 2: async function to get response envelope after verification, then send result back
* Example usage: app.post('/', new ExpressAdapter(skill).getASKRequestHandler());
*/
getRequestHandlers() {
const requestHandlers = [];
requestHandlers.push((req, res, next) => {
if (req.body) {
res.statusCode = 500;
res.send('Error in processing request. Do not register any parsers before using the adapter');
return;
}
next();
});
requestHandlers.push((0, body_parser_1.text)({
type: '*/*',
}));
requestHandlers.push(async (req, res) => {
try {
const responseEnvelope = await (0, util_1.asyncVerifyRequestAndDispatch)(req.headers, req.body, this.skill, this.verifiers);
res.json(responseEnvelope);
}
catch (err) {
res.statusCode = err.name === 'AskSdk.Request verification failed Error' ? 400 : 500;
res.send(`${err.name}, ${err.message}`);
}
});
return requestHandlers;
}
}
exports.ExpressAdapter = ExpressAdapter;
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