feat: add jwt auth extension

extensions/authentication-jwt/.npmrc

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+package-lock=true

extensions/authentication-jwt/LICENSE

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+Copyright (c) IBM Corp. 2019. All Rights Reserved.
+Node module: @loopback/extension-health
+This project is licensed under the MIT License, full text below.
+
+--------
+
+MIT license
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

extensions/authentication-jwt/README.md

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+# @loopback/extension-authentication-jwt
+
+This module exports the jwt authentication strategy and its corresponding token
+service as a component. You can mount the component to get a prototype token
+based authentication system in your LoopBack 4 application.
+
+## Usage
+
+This module contains an example LoopBack 4 application in folder `fixtures`. It
+contains:
+
+- a `User` and a `UserCredentials` model.
+- a user service that contains user utility functions like validating
+  credentials.
+  - tip: the user service is not extracted into the jwt component because it
+    couples with model `User` and `UserCredentials`.
+- a controller with endpoints `/login` and `/whoAmI`.
+
+To mount the jwt component in the example, you can add this code in file
+`application.ts`:
+
+```ts
+// Assume you already enabled the authentication system
+// in the sequence and application file.
+this.component(JWTAuthenticationComponent);
+
+// You will find the current example has an extra function to
+// merge the security spec into the application.
+// This will be improved with a coming enhancer.
+// See section [To Be Done](#to-be-done)
+```
+
+_All the jwt authentication related code are marked with comment "- enable jwt
+auth -", you can search for it to find all the related code you need to enable
+the entire jwt authentication in a LoopBack 4 application._
+
+## To Be Done
+
+The security specification is currently manually added in the application file.
+The next step is to create an enhancer in the component to automatically bind
+the spec when app starts.
+
+## Contributions
+
+- [Guidelines](https://github.com/strongloop/loopback-next/blob/master/docs/CONTRIBUTING.md)
+- [Join the team](https://github.com/strongloop/loopback-next/issues/110)
+
+## Tests
+
+Run `npm test` from the root folder.
+
+## Contributors
+
+See
+[all contributors](https://github.com/strongloop/loopback-next/graphs/contributors).
+
+## License
+
+MIT

extensions/authentication-jwt/index.d.ts

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+// Copyright IBM Corp. 2019. All Rights Reserved.
+// Node module: @loopback/extension-health
+// This file is licensed under the MIT License.
+// License text available at https://opensource.org/licenses/MIT
+
+export * from './dist';

extensions/authentication-jwt/index.js

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+// Copyright IBM Corp. 2019. All Rights Reserved.
+// Node module: @loopback/extension-health
+// This file is licensed under the MIT License.
+// License text available at https://opensource.org/licenses/MIT
+
+module.exports = require('./dist');

extensions/authentication-jwt/index.ts

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+// Copyright IBM Corp. 2019. All Rights Reserved.
+// Node module: @loopback/extension-health
+// This file is licensed under the MIT License.
+// License text available at https://opensource.org/licenses/MIT
+
+// DO NOT EDIT THIS FILE
+// Add any additional (re)exports to src/index.ts instead.
+export * from './src';