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‎.github/FUNDING.yml‎

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custom: https://paypal.me/janloebel

‎.gitignore‎

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# Maven
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target
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# Eclipse
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.settings/
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.classpath
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.project
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.factorypath
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# IntelliJ
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*.iml

‎LICENSE‎

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

‎README.md‎

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# Json-Schema-Validation-Starter
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This provides a Spring-Boot-Starter to include JsonSchemaValidation with the help of the [https://github.com/networknt/json-schema-validator](https://github.com/networknt/json-schema-validator) -library.
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## Usage
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Include the starter into you're project.
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You need to add jitpack to your `pom.xml` because this project is not available in the official maven repository.
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```
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<repositories>
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<repository>
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<id>jitpack.io</id>
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<url>https://jitpack.io</url>
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</repository>
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</repositories>
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```
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Add the `json-schema-validation-starter`-dependency to your `pom.xml`
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```
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<dependency>
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<groupId>com.github.JanLoebel</groupId>
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<artifactId>json-schema-validation-starter</artifactId>
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<version>1.0.0</version>
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</dependency>
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```
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After that simply create a json-schema and put it into e.g.: `resources/jsonschema/book.json`.
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The last step is now to let your entity know that it should be validated and which schema it should use.
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```
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@JsonSchemaValidation("classpath:jsonschema/book.json")
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public class Book {
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private String title;
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private String author;
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}
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```
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## Example project
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Head over to [http://github.com/JanLoebel/json-schema-validation-starter-example](http://github.com/JanLoebel/json-schema-validation-starter-example) to checkout the sample project.
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## Contribution
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Please feel free to improve or modify the code and open a Pull-Request! Any contribution is welcome :)
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## License
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MIT License
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Copyright (c) 2019 Jan Löbel
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See LICENSE file for details.

‎pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.github.JanLoebel</groupId>
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<artifactId>json-schema-validation-starter</artifactId>
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<version>1.0.0-SNAPSHOT</version>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<spring-boot.version>2.2.2.RELEASE</spring-boot.version>
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<spring.version>5.2.2.RELEASE</spring.version>
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<java.version>8</java.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot</artifactId>
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<version>${spring-boot.version}</version>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-autoconfigure</artifactId>
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<version>${spring-boot.version}</version>
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</dependency>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-webmvc</artifactId>
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<version>${spring.version}</version>
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</dependency>
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<dependency>
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<groupId>com.networknt</groupId>
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<artifactId>json-schema-validator</artifactId>
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<version>1.0.29</version>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>${java.version}</source>
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<target>${java.version}</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

‎src/main/java/com/github/JanLoebel/jsonschemavalidation/JsonSchemaValidation.java‎

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package com.github.JanLoebel.jsonschemavalidation;
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import java.lang.annotation.ElementType;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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import java.lang.annotation.Target;
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@Target(ElementType.TYPE)
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@Retention(RetentionPolicy.RUNTIME)
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public @interface JsonSchemaValidation {
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String value();
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}

‎src/main/java/com/github/JanLoebel/jsonschemavalidation/JsonSchemaValidationAutoConfiguration.java‎

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package com.github.JanLoebel.jsonschemavalidation;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.github.JanLoebel.jsonschemavalidation.advice.JsonValidationRequestBodyControllerAdvice;
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import com.github.JanLoebel.jsonschemavalidation.provider.DefaultJsonSchemaProvider;
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import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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@Configuration
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public class JsonSchemaValidationAutoConfiguration {
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@Bean
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@ConditionalOnMissingBean
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public JsonValidationRequestBodyControllerAdvice jsonValidationRequestBodyControllerAdvice(ObjectMapper objectMapper) {
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return new JsonValidationRequestBodyControllerAdvice(objectMapper, new DefaultJsonSchemaProvider());
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}
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}

‎src/main/java/com/github/JanLoebel/jsonschemavalidation/JsonSchemaValidationException.java‎

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package com.github.JanLoebel.jsonschemavalidation;
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import com.networknt.schema.ValidationMessage;
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import org.springframework.http.HttpStatus;
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import org.springframework.web.server.ResponseStatusException;
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import java.util.Collection;
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import java.util.stream.Collectors;
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public class JsonSchemaValidationException extends ResponseStatusException {
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private final Collection<ValidationMessage> validationMessages;
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public JsonSchemaValidationException(Collection<ValidationMessage> validationMessages) {
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super(HttpStatus.BAD_REQUEST, buildMessage(validationMessages));
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this.validationMessages = validationMessages;
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}
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private static String buildMessage(Collection<ValidationMessage> validationMessages) {
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final String prefix = "JsonSchemaValidation failed: ";
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return prefix + validationMessages
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.stream()
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.map(ValidationMessage::toString)
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.collect(Collectors.joining(", "));
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}
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public Collection<ValidationMessage> getValidationMessages() {
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return this.validationMessages;
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}
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@Override
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public String toString() {
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return "JsonSchemaValidationException{" +
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"validationMessages=" + validationMessages +
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'}';
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}
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}

‎src/main/java/com/github/JanLoebel/jsonschemavalidation/advice/JsonValidationRequestBodyControllerAdvice.java‎

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package com.github.JanLoebel.jsonschemavalidation.advice;
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import com.fasterxml.jackson.databind.JsonNode;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.github.JanLoebel.jsonschemavalidation.JsonSchemaValidation;
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import com.github.JanLoebel.jsonschemavalidation.provider.JsonSchemaProvider;
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import com.networknt.schema.ValidationMessage;
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import org.springframework.core.MethodParameter;
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import org.springframework.http.HttpHeaders;
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import org.springframework.http.HttpInputMessage;
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import org.springframework.http.converter.HttpMessageConverter;
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import org.springframework.util.StreamUtils;
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import org.springframework.web.bind.annotation.ControllerAdvice;
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import org.springframework.web.servlet.mvc.method.annotation.RequestBodyAdvice;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.lang.reflect.Type;
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import java.nio.charset.StandardCharsets;
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import java.util.Set;
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@ControllerAdvice
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public class JsonValidationRequestBodyControllerAdvice implements RequestBodyAdvice {
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private ObjectMapper objectMapper;
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private JsonSchemaProvider jsonSchemaProvider;
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public JsonValidationRequestBodyControllerAdvice(ObjectMapper objectMapper, JsonSchemaProvider jsonSchemaProvider) {
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this.objectMapper = objectMapper;
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this.jsonSchemaProvider = jsonSchemaProvider;
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}
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@Override
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public boolean supports(MethodParameter parameter,
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Type targetType, Class<? extends HttpMessageConverter<?>> converterType) {
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return parameter.getNestedParameterType().isAnnotationPresent(JsonSchemaValidation.class);
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}
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@Override
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public HttpInputMessage beforeBodyRead(HttpInputMessage inputMessage, MethodParameter parameter,
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Type targetType, Class<? extends HttpMessageConverter<?>> converterType)
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throws IOException {
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final String body = toString(inputMessage);
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final String uri = extractSchemaUri(parameter);
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final JsonNode jsonNode = this.objectMapper.readTree(body);
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final Set<ValidationMessage> validationMessages = this.jsonSchemaProvider.loadSchema(uri).validate(jsonNode);
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this.jsonSchemaProvider.handleValidationMessages(validationMessages);
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return buildHttpInputMessage(body, inputMessage.getHeaders());
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}
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private String extractSchemaUri(MethodParameter parameter) {
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final JsonSchemaValidation annotation =
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parameter.getNestedParameterType().getAnnotation(JsonSchemaValidation.class);
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return annotation.value();
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}
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@Override
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public Object afterBodyRead(Object body, HttpInputMessage inputMessage, MethodParameter parameter,
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Type targetType, Class<? extends HttpMessageConverter<?>> converterType) {
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// Do not touch
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return body;
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}
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@Override
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public Object handleEmptyBody(Object body, HttpInputMessage inputMessage, MethodParameter parameter,
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Type targetType, Class<? extends HttpMessageConverter<?>> converterType) {
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// Do not touch
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return body;
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}
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private String toString(HttpInputMessage inputMessage) throws IOException {
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final InputStream inputStream = inputMessage.getBody();
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return StreamUtils.copyToString(inputStream, StandardCharsets.UTF_8);
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}
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private InputStream fromString(String body) {
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return new ByteArrayInputStream(body.getBytes());
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}
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private HttpInputMessage buildHttpInputMessage(String body, HttpHeaders httpHeaders) {
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return new HttpInputMessage() {
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@Override
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public InputStream getBody() {
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return fromString(body);
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}
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@Override
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public HttpHeaders getHeaders() {
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return httpHeaders;
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}
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};
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}
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}

‎src/main/java/com/github/JanLoebel/jsonschemavalidation/provider/CacheableJsonSchemaProvider.java‎

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package com.github.JanLoebel.jsonschemavalidation.provider;
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import com.networknt.schema.JsonSchema;
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import java.util.Map;
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import java.util.concurrent.ConcurrentHashMap;
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public class CacheableJsonSchemaProvider extends DefaultJsonSchemaProvider {
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private final Map<String, JsonSchema> cache = new ConcurrentHashMap<>();
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private final String basePath;
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public CacheableJsonSchemaProvider(String basePath) {
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this.basePath = basePath;
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}
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public CacheableJsonSchemaProvider() {
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this("");
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}
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@Override
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public JsonSchema loadSchema(String url) {
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final String fullPath = basePath + url;
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if (cache.containsKey(fullPath)) {
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return cache.get(fullPath);
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}
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return putToCache(fullPath, super.loadSchema(fullPath));
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}
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private JsonSchema putToCache(String fullPath, JsonSchema jsonSchema) {
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cache.put(fullPath, jsonSchema);
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return jsonSchema;
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}
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}

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