如何配置带有身份验证的嵌入式MongoDB，以用于Spring Boot集成测试？

Question

I have a spring boot application that is using MongoDB for persistence. I'm putting together integration tests, and I'm using the flapdoodle embedded mongo library for the embedded DB.

This is coupled with spring boots auto-configure and everything works wonderfully for integration tests. As soon as I add authentication credentials for MongoDB, however, everything falls apart.

My understanding is that spring auto-configure finds the credentials and attempts to connect to the database with authentication, which fails, because it's an embedded database that hasn't been initialized with credentials yet.

I've attempted to use mongeez in order to initialize the credentials pre-spring startup, but this library has the same issue with credentials sensing.

So my real question:

Is there a way to initialize the embedded database with authentication? I've been digging through the source code and haven't found anything.

Answer 1

I had the same issue. This is how it works for me (using Kotlin):

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT, properties = ["spring.data.mongodb.port="])
class IntegrationTests {

@Autowired
private val webClient: WebTestClient? = null

@Autowired
private val mongoConfig: IMongodConfig? = null
var collection: MongoCollection<Document>? = null

fun createDBAndCollection(collectionName: String){
    val mongo = MongoClient("127.0.0.1", mongoConfig!!.net().port)
    val db = mongo.getDatabase("local")
    db.createCollection(collectionName)
    collection = db.getCollection(collectionName)
}

@Test
fun `Find all tracks on JSON REST endpoint`() {
    createDBAndCollection("track")
    collection?.insertOne(Document("key", "val"))

    webClient!!.get().uri("/reactive/tracks")
            .accept(APPLICATION_JSON)
            .exchange()
            .expectStatus().is2xxSuccessful
            .expectBodyList<Track>()
            .hasSize(1);
}
}

• No need to change application.properties. Its enough to empty the port setting using the SprintBootTest Annotation (other approaches did not work for me, like eg @TestPropertySource)
• mongoConfig is injected and used to retrieve the random port generated by flapdoodle
• the database name must match the one in application.properties (I am sure there is a way to read this dynamically at runtime though).

My gradle test dependencies are:

testImplementation('de.flapdoodle.embed:de.flapdoodle.embed.mongo')
testImplementation('io.projectreactor:reactor-test')
testImplementation('org.springframework.boot:spring-boot-starter-test')
testImplementation("org.junit.jupiter:junit-jupiter-api")
testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine")

Answer 2

Actually you can create an authenticated user by looking at you admin.system.users collection. Just create a test user and put it there with the mongo client. As soon as you have a user there you can dump that document and use that json to create a new authenticated user in your embedded mongo test suite. It would be something like this:

private static void createAuthorizationUser() {
    MongoClient mongoClient = new MongoClient(HOST);
    MongoDatabase admin = mongoClient.getDatabase("admin");
    MongoCollection<Document> usersCollection = admin.getCollection("system.users");
    usersCollection.insertOne(Document.parse(""
            + "{\n" + 
            "    \"_id\": \"admin.test-user\",\n" + 
            //"    \"userId\": Binary(\"rT2Ig**********jGXZEQ==\", 4),\n" + 
            "    \"user\": \"test-user\",\n" + 
            "    \"db\": \"admin\",\n" + 
            "    \"credentials\": {\n" + 
            "        \"SCRAM-SHA-1\": {\n" + 
            "            \"iterationCount\": 10000,\n" + 
            "            \"salt\": \"gmm******GnNcAw==\",\n" + 
            "            \"storedKey\": \"qE***********8/LAvG7s=\",\n" + 
            "            \"serverKey\": \"Re*********eQh6w=\"\n" + 
            "        }\n" + 
            "    },\n" + 
            "    \"roles\": [\n" + 
            "        {\n" + 
            "            \"role\": \"readWrite\",\n" + 
            "            \"db\": \"test\"\n" + 
            "        }\n" + 
            "    ]\n" + 
            "}"
            + ""));
}

I've created a user named test-user that has readWrite privileges over test db. For some reason the embedded Mongo does not like the Binary function, but just commenting it does not hurt the authentication feature.

When creating a client you can do simply through

MongoClient mongoClient = new MongoClient(
    new MongoClientURI( 
        String.format("mongodb://%s:%s@%s:%d/%s", "test-user", "****", "localhost", 27017, "admin" ) 
    )
);

It should fix the problem.