Add JwtClaimValidator

Fixes gh-7860

Author: zeeshanadnan

oauth2/oauth2-jose/src/main/java/org/springframework/security/oauth2/jwt/JwtClaimValidator.java

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2002-2020 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.oauth2.jwt;
+
+import org.springframework.security.oauth2.core.OAuth2Error;
+import org.springframework.security.oauth2.core.OAuth2ErrorCodes;
+import org.springframework.security.oauth2.core.OAuth2TokenValidator;
+import org.springframework.security.oauth2.core.OAuth2TokenValidatorResult;
+import org.springframework.util.Assert;
+
+import java.util.function.Predicate;
+
+/**
+ * Validates a claim in a {@link Jwt} against a provided {@link java.util.function.Predicate}
+ *
+ * @author Zeeshan Adnan
+ * @since 5.3
+ */
+public final class JwtClaimValidator<T> implements OAuth2TokenValidator<Jwt> {
+
+	private final String claim;
+	private final Predicate<T> test;
+	private final OAuth2Error error;
+
+	/**
+	 * Constructs a {@link JwtClaimValidator} using the provided parameters
+	 *
+	 * @param claim - is the name of the claim in {@link Jwt} to validate.
+	 * @param test - is the predicate function for the claim to test against.
+	 */
+	public JwtClaimValidator(String claim, Predicate<T> test) {
+		Assert.notNull(claim, "claim can not be null");
+		Assert.notNull(test, "test can not be null");
+		this.claim = claim;
+		this.test = test;
+		this.error = new OAuth2Error(OAuth2ErrorCodes.INVALID_REQUEST,
+				"The " + this.claim + " claim is not valid",
+				"https://tools.ietf.org/html/rfc6750#section-3.1");
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public OAuth2TokenValidatorResult validate(Jwt token) {
+		Assert.notNull(token, "token cannot be null");
+		T claimValue = token.getClaim(this.claim);
+		if (test.test(claimValue)) {
+			return OAuth2TokenValidatorResult.success();
+		} else {
+			return OAuth2TokenValidatorResult.failure(error);
+		}
+	}
+}

oauth2/oauth2-jose/src/main/java/org/springframework/security/oauth2/jwt/JwtIssuerValidator.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -15,26 +15,21 @@
  */
 package org.springframework.security.oauth2.jwt;
 
-import org.springframework.security.oauth2.core.OAuth2Error;
-import org.springframework.security.oauth2.core.OAuth2ErrorCodes;
 import org.springframework.security.oauth2.core.OAuth2TokenValidator;
 import org.springframework.security.oauth2.core.OAuth2TokenValidatorResult;
 import org.springframework.util.Assert;
 
+import static org.springframework.security.oauth2.jwt.JwtClaimNames.ISS;
+
 /**
  * Validates the "iss" claim in a {@link Jwt}, that is matches a configured value
  *
  * @author Josh Cummings
  * @since 5.1
  */
 public final class JwtIssuerValidator implements OAuth2TokenValidator<Jwt> {
-	private static OAuth2Error INVALID_ISSUER =
-			new OAuth2Error(
-					OAuth2ErrorCodes.INVALID_REQUEST,
-					"This iss claim is not equal to the configured issuer",
-					"https://tools.ietf.org/html/rfc6750#section-3.1");
 
-	private final String issuer;
+	private final JwtClaimValidator<String> validator;
 
 	/**
 	 * Constructs a {@link JwtIssuerValidator} using the provided parameters
@@ -43,7 +38,7 @@ public final class JwtIssuerValidator implements OAuth2TokenValidator<Jwt> {
 	 */
 	public JwtIssuerValidator(String issuer) {
 		Assert.notNull(issuer, "issuer cannot be null");
-		this.issuer = issuer;
+		this.validator = new JwtClaimValidator(ISS, issuer::equals);
 	}
 
 	/**
@@ -52,12 +47,6 @@ public JwtIssuerValidator(String issuer) {
 	@Override
 	public OAuth2TokenValidatorResult validate(Jwt token) {
 		Assert.notNull(token, "token cannot be null");
-
-		String tokenIssuer = token.getClaimAsString(JwtClaimNames.ISS);
-		if (this.issuer.equals(tokenIssuer)) {
-			return OAuth2TokenValidatorResult.success();
-		} else {
-			return OAuth2TokenValidatorResult.failure(INVALID_ISSUER);
-		}
+		return this.validator.validate(token);
 	}
 }

oauth2/oauth2-jose/src/test/java/org/springframework/security/oauth2/jwt/JwtClaimValidatorTests.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright 2002-2020 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.oauth2.jwt;
+
+import org.junit.Test;
+import org.springframework.security.oauth2.core.OAuth2TokenValidatorResult;
+
+import java.util.function.Predicate;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.springframework.security.oauth2.jwt.JwtClaimNames.ISS;
+import static org.springframework.security.oauth2.jwt.TestJwts.jwt;
+
+/**
+ * Tests for {@link JwtClaimValidator}.
+ *
+ * @author Zeeshan Adnan
+ */
+public class JwtClaimValidatorTests {
+
+	private static final Predicate<String> test = claim -> claim.equals("http://test");
+	private final JwtClaimValidator<String> validator = new JwtClaimValidator<>(ISS, test);
+
+	@Test
+	public void validateWhenClaimPassesTheTestThenReturnsSuccess() {
+		Jwt jwt = jwt().claim(ISS, "http://test").build();
+		assertThat(validator.validate(jwt))
+				.isEqualTo(OAuth2TokenValidatorResult.success());
+	}
+
+	@Test
+	public void validateWhenClaimFailsTheTestThenReturnsFailure() {
+		Jwt jwt = jwt().claim(ISS, "http://abc").build();
+		assertThat(validator.validate(jwt).getErrors().isEmpty())
+				.isFalse();
+	}
+
+	@Test
+	public void validateWhenClaimIsNullThenThrowsIllegalArgumentException() {
+		assertThatThrownBy(() -> new JwtClaimValidator<String>(null, test))
+				.isInstanceOf(IllegalArgumentException.class);
+	}
+
+	@Test
+	public void validateWhenTestIsNullThenThrowsIllegalArgumentException(){
+		assertThatThrownBy(() -> new JwtClaimValidator<>(ISS, null))
+				.isInstanceOf(IllegalArgumentException.class);
+	}
+
+	@Test
+	public void validateWhenJwtIsNullThenThrowsIllegalArgumentException() {
+		assertThatThrownBy(() -> validator.validate(null))
+				.isInstanceOf(IllegalArgumentException.class);
+	}
+}