Add support for One-Time Token Login

Closes gh-15114

core/src/test/java/org/springframework/security/authentication/ott/InMemoryOneTimeTokenServiceTests.java

@@ -0,0 +1,113 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License 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.
+ */
+
+package org.springframework.security.authentication.ott;
+
+import java.time.Clock;
+import java.time.Instant;
+import java.time.ZoneOffset;
+import java.time.temporal.ChronoUnit;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+import java.util.UUID;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatNoException;
+
+/**
+ * Tests for {@link InMemoryOneTimeTokenService}
+ *
+ * @author Marcus da Coregio
+ */
+class InMemoryOneTimeTokenServiceTests {
+
+	InMemoryOneTimeTokenService oneTimeTokenService = new InMemoryOneTimeTokenService();
+
+	@Test
+	void generateThenTokenValueShouldBeValidUuidAndProvidedUsernameIsUsed() {
+		GenerateOneTimeTokenRequest request = new GenerateOneTimeTokenRequest("user");
+		OneTimeToken oneTimeToken = this.oneTimeTokenService.generate(request);
+		assertThatNoException().isThrownBy(() -> UUID.fromString(oneTimeToken.getTokenValue()));
+		assertThat(request.getUsername()).isEqualTo("user");
+	}
+
+	@Test
+	void consumeWhenTokenDoesNotExistsThenNull() {
+		OneTimeTokenAuthenticationToken authenticationToken = new OneTimeTokenAuthenticationToken("123");
+		OneTimeToken oneTimeToken = this.oneTimeTokenService.consume(authenticationToken);
+		assertThat(oneTimeToken).isNull();
+	}
+
+	@Test
+	void consumeWhenTokenExistsThenReturnItself() {
+		GenerateOneTimeTokenRequest request = new GenerateOneTimeTokenRequest("user");
+		OneTimeToken generated = this.oneTimeTokenService.generate(request);
+		OneTimeTokenAuthenticationToken authenticationToken = new OneTimeTokenAuthenticationToken(
+				generated.getTokenValue());
+		OneTimeToken consumed = this.oneTimeTokenService.consume(authenticationToken);
+		assertThat(consumed.getTokenValue()).isEqualTo(generated.getTokenValue());
+		assertThat(consumed.getUsername()).isEqualTo(generated.getUsername());
+		assertThat(consumed.getExpiresAt()).isEqualTo(generated.getExpiresAt());
+	}
+
+	@Test
+	void consumeWhenTokenIsExpiredThenReturnNull() {
+		GenerateOneTimeTokenRequest request = new GenerateOneTimeTokenRequest("user");
+		OneTimeToken generated = this.oneTimeTokenService.generate(request);
+		OneTimeTokenAuthenticationToken authenticationToken = new OneTimeTokenAuthenticationToken(
+				generated.getTokenValue());
+		Clock tenMinutesFromNow = Clock.fixed(Instant.now().plus(10, ChronoUnit.MINUTES), ZoneOffset.UTC);
+		this.oneTimeTokenService.setClock(tenMinutesFromNow);
+		OneTimeToken consumed = this.oneTimeTokenService.consume(authenticationToken);
+		assertThat(consumed).isNull();
+	}
+
+	@Test
+	void generateWhenMoreThan100TokensThenClearExpired() {
+		// @formatter:off
+		List<OneTimeToken> toExpire = generate(50); // 50 tokens will expire in 5 minutes from now
+		Clock twoMinutesFromNow = Clock.fixed(Instant.now().plus(2, ChronoUnit.MINUTES), ZoneOffset.UTC);
+		this.oneTimeTokenService.setClock(twoMinutesFromNow);
+		List<OneTimeToken> toKeep = generate(50); // 50 tokens will expire in 7 minutes from now
+		Clock sixMinutesFromNow = Clock.fixed(Instant.now().plus(6, ChronoUnit.MINUTES), ZoneOffset.UTC);
+		this.oneTimeTokenService.setClock(sixMinutesFromNow);
+
+		assertThat(toExpire)
+			.extracting(
+					(token) -> this.oneTimeTokenService.consume(new OneTimeTokenAuthenticationToken(token.getTokenValue())))
+			.containsOnlyNulls();
+
+		assertThat(toKeep)
+			.extracting(
+					(token) -> this.oneTimeTokenService.consume(new OneTimeTokenAuthenticationToken(token.getTokenValue())))
+			.noneMatch(Objects::isNull);
+		// @formatter:on
+	}
+
+	private List<OneTimeToken> generate(int howMany) {
+		List<OneTimeToken> generated = new ArrayList<>(howMany);
+		for (int i = 0; i < howMany; i++) {
+			OneTimeToken oneTimeToken = this.oneTimeTokenService
+				.generate(new GenerateOneTimeTokenRequest("generated" + i));
+			generated.add(oneTimeToken);
+		}
+		return generated;
+	}
+
+}