Spring Boot Java AuthN Service

Source: https://github.com/spruceid/didkit/tree/main/examples/java-springboot

Introduction#

This project demonstrates use of verifiable credentials and presentations to enable user authentication for an application. See the DIDKit repository's examples folder for code snippets.

Set up & Installation#

This project has the following key dependencies to consider:

  1. Java 11
  2. DIDKit compiled locally & linked from the classpath
  3. The DIDKit Java artifact (didkit.jar), usually built by DIDKit installation.
  4. A MySQL database

Java#

To run this example you will need Java 11 installed.

For example, on Ubuntu you could install OpenJDK:

$ apt-get install openjdk-11-{jre,jdk}

Build DIDKit#

The web application makes use of DIDKit to handle credentials and presentations, please refer to the project's documentation to build the library for your platform, libdidkit.so on UNIX-like systems, didkit.dll on Windows, libdidkit.dylib on MacOS, etc.

Then you will have to add it to the classpath of your platform. On UNIX systems, for example, you can copy (or symlink) libdidkit.so to /usr/lib or /usr/local/lib. In the instructions below, we will list commands to create a symlink to the local build folder.

You will then require the Java artifact (didkit.jar). This example project already has a symlink in the build directory. All you have to do is run the following commands in the root folder to build everything and ensure proper linking:

$ cargo build
# Use libdidkit.so for UNIX-like, didkit.dll for Windows, libdidkit.dylib for MacOS
$ ln -s target/debug/libdidkit.so examples/java-springboot/
$ make -C lib ../target/didkit.jar

If you are trying to use DIDKit with an external Java project, you will have to point your build tool (Gradle, Maven, etc) to the didkit.jar file. Also ensure that the static library (e.g., libdidkit.so is in the java.library.path or specified using the proper environment variables, such as LD_LIBRARY_PATH on UNIX-like. Please refer to the full documentation for those tools. Here is an excerpt of how we have listed it on this project's pom.xml for Maven:

<dependency>
<groupId>com.spruceid.didkit</groupId>
<artifactId>didkit</artifactId>
<version>0.1</version>
<scope>system</scope>
<systemPath>${basedir}/didkit.jar</systemPath>
</dependency>

Database Setup (MySQL)#

This project uses a MySQL database to store the user entity. We will use the root user for simplicity because this is only an example. In your actual deployments, it is very important that you configure the correct accounts, policies, and permissions for your SQL installations.

(a) Docker MySQL Database#

One easy way to run an instance is by using docker:

$ docker run \
-e MYSQL_ROOT_PASSWORD=root \
-e MYSQL_DATABASE=didkit \
-p 3306:3306 \
--name didkit-java-db \
-d mysql:5

(b) System MySQL Database#

Here are some commands to use a local instance of the MySQL-compatible MariaDB on Ubuntu:

$ sudo apt-get install mariadb-client mariadb-server
$ sudo service mysql start
$ sudo mysql_secure_installation # set the root password to 'root'
$ sudo mariadb
# allow anyone to use the root account with the right password. DO NOT DO THIS IN PRODUCTION.
MariaDB [(none)]> UPDATE mysql.user SET plugin = 'mysql_native_password' WHERE User='root';
MariaDB [(none)]> FLUSH PRIVILEGES;
# create the example database
MariaDB [(none)]> CREATE DATABASE didkit;
MariaDB [(none)]> quit

(Optional) Test MySQL#

To ensure that mysql is working, try the following command:

$ apt-get install mariadb-client
$ mariadb -uroot -proot
MariaDB [(none)]> SHOW DATABASES;
MariaDB [(none)]> quit

Database Connection Configuration#

If you need to modify the database credentials you will need to update the relevant fields in src/main/resources/application.properties.

spring.datasource.url=jdbc:mysql://localhost:3306/didkit
spring.datasource.username=root
spring.datasource.password=root

Redis#

This project makes use of Redis to store single use tokens and authentication information for the QR code flows.

(a) Docker Redis#

One easy way, just like MySQL, to have it running locally is to use docker:

# docker run \
-p 6379:6379 \
--name didkit-java-redis \
-d redis

(b) System Redis#

Here are some commands to install and run Redis on Ubuntu:

sudo apt-get install redis
sudo service redis-server start

(Optional) Test Redis#

To ensure that mysql is working, try the following commands:

$ apt-get install redis
$ redis-cli
127.0.0.1:6379> set foo "Hello, World!"
127.0.0.1:6379> get foo
127.0.0.1:6379> del foo

Building and Running#

We are now ready to build and run the installation. To download the required Java dependencies, build the project, and then run it, you can execute the following commands from the root project directory:

$ cd examples/java-sprintboot
$ LD_LIBRARY_PATH=`pwd` ./mvnw spring-boot:run

You can then load http://localhost:8081 to see the web application.

To verify that DIDKit has been setup correctly, you can then run:

$ curl -v http://localhost:8081/version

And you should expect to see a version string in the response.

Java Example App Walkthrough#

  1. Visit http://localhost:8081 with your web browser.
  2. Create a user by clicking "Sign Up" on the navigation bar.
  3. Log in with your newly created user by clicking "Sign In" on the navigation bar.
  4. Issue yourself a credential to use for login instead of username and password. You can receive credentials in the example CHAPI wallet or using the QR code workflow and Credible mobile wallet.
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