如何使用包含对另一个模式的引用的模式验证 JSON？

【问题标题】：How to validate JSON with schema which contains a reference to another schema?如何使用包含对另一个模式的引用的模式验证 JSON？
【发布时间】：2020-12-17 19:08:06
【问题描述】：

我想使用 JSON 模式文件验证 JSON 文件，其中包含对另一个 JSON 模式文件的引用。

我为我的 Apache Camel 路由添加了 JSON Schema Validator。因为我使用 JSON 架构版本 draft-07 而默认版本是 draft-04，所以我暴露了一个JsonSchemaLoader，另见https://stackoverflow.com/a/63417253/5277820。

第一个架构 test-schema-1 是从类路径加载的，而第二个架构 test-schema-2 是从 Internet 加载的。使用的 ID http://mycompany/test-schema2.json 只是一个 ID，不是真正的资源，因此我得到一个异常。

有没有办法从类路径中加载第二个 JSON 模式？

Spring Boot 应用程序

@SpringBootApplication
public class TestApplication {
  public static void main(String[] args) {
    SpringApplication.run(TestApplication.class, args);
  }

  @Bean
  public JsonSchemaLoader mySchemaLoader() {
    return (camelContext, schemaStream) -> 
        JsonSchemaFactory.getInstance(SpecVersion.VersionFlag.V7).getSchema(schemaStream);
  }

  @Bean
  public EndpointRouteBuilder routeBuilder() {
    return new EndpointRouteBuilder() {
      @Override
      public void configure() throws Exception {
        from(file("d:/tmp/camel/"))
            .to(jsonValidator("/test/test-schema1.json").advanced().schemaLoader(mySchemaLoader())).stop();
      }
    };
  }
}

JSON 架构

test-schema-1:

{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "$id": "http://mycompany/test-schema1.json",
    "type": "object",
    "properties": {
        "obj": {
            "$ref": "test-schema2.json"
        }
    },
    "required": [
        "target"
    ]
}

test-schema-2:

{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "$id": "http://mycompany/test-schema2.json",
    "type": "object",
    "properties": {
        "value": {
            "type": "string"
        }
    }
}

日志

Message History (complete message history is disabled)
---------------------------------------------------------------------------------------------------------------------------------------
RouteId              ProcessorId          Processor                                                                        Elapsed (ms)
[route1            ] [route1            ] [from[file://d:/tmp/camel/]                                                    ] [         5]
...
[route1            ] [to1               ] [json-validator:///test/test-schema1.json?hash=93f27f49                        ] [         0]

Stacktrace
---------------------------------------------------------------------------------------------------------------------------------------

com.networknt.schema.JsonSchemaException: java.net.UnknownHostException: mycompany
    at com.networknt.schema.JsonSchemaFactory.getSchema(JsonSchemaFactory.java:348) ~[json-schema-validator-1.0.43.jar:na]
    at com.networknt.schema.RefValidator.getRefSchema(RefValidator.java:76) ~[json-schema-validator-1.0.43.jar:na]
    at com.networknt.schema.RefValidator.<init>(RefValidator.java:41) ~[json-schema-validator-1.0.43.jar:na]
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:na]
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:na]
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490) ~[na:na]
    at com.networknt.schema.ValidatorTypeCode.newValidator(ValidatorTypeCode.java:131) ~[json-schema-validator-1.0.43.jar:na]
    at com.networknt.schema.JsonMetaSchema.newValidator(JsonMetaSchema.java:342) ~[json-schema-validator-1.0.43.jar:na]
    at com.networknt.schema.ValidationContext.newValidator(ValidationContext.java:53) ~[json-schema-validator-1.0.43.jar:na]
    at com.networknt.schema.JsonSchema.read(JsonSchema.java:198) ~[json-schema-validator-1.0.43.jar:na]
    at com.networknt.schema.JsonSchema.initialize(JsonSchema.java:76) ~[json-schema-validator-1.0.43.jar:na]
    at com.networknt.schema.PropertiesValidator.<init>(PropertiesValidator.java:36) ~[json-schema-validator-1.0.43.jar:na]
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:na]
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:na]
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490) ~[na:na]
    at com.networknt.schema.ValidatorTypeCode.newValidator(ValidatorTypeCode.java:131) ~[json-schema-validator-1.0.43.jar:na]
    at com.networknt.schema.JsonMetaSchema.newValidator(JsonMetaSchema.java:342) ~[json-schema-validator-1.0.43.jar:na]
    at com.networknt.schema.ValidationContext.newValidator(ValidationContext.java:53) ~[json-schema-validator-1.0.43.jar:na]
    at com.networknt.schema.JsonSchema.read(JsonSchema.java:198) ~[json-schema-validator-1.0.43.jar:na]
    at com.networknt.schema.JsonSchema.initialize(JsonSchema.java:76) ~[json-schema-validator-1.0.43.jar:na]
    at com.networknt.schema.JsonSchemaFactory.newJsonSchema(JsonSchemaFactory.java:254) ~[json-schema-validator-1.0.43.jar:na]
    at com.networknt.schema.JsonSchemaFactory.getSchema(JsonSchemaFactory.java:296) ~[json-schema-validator-1.0.43.jar:na]
    at com.networknt.schema.JsonSchemaFactory.getSchema(JsonSchemaFactory.java:304) ~[json-schema-validator-1.0.43.jar:na]
    at test.TestApplication.lambda$0(TestApplication.java:22) ~[classes/:na]
    at org.apache.camel.component.jsonvalidator.JsonValidatorEndpoint.getOrCreateSchema(JsonValidatorEndpoint.java:162) ~[camel-json-validator-3.5.0.jar:3.5.0]
    at org.apache.camel.component.jsonvalidator.JsonValidatorEndpoint.onExchange(JsonValidatorEndpoint.java:94) ~[camel-json-validator-3.5.0.jar:3.5.0]
    at org.apache.camel.support.ProcessorEndpoint$1.process(ProcessorEndpoint.java:61) ~[camel-support-3.5.0.jar:3.5.0]
    at org.apache.camel.support.AsyncProcessorConverterHelper$ProcessorToAsyncProcessorBridge.process(AsyncProcessorConverterHelper.java:66) ~[camel-support-3.5.0.jar:3.5.0]
    at org.apache.camel.processor.SendProcessor.process(SendProcessor.java:169) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler$SimpleTask.run(RedeliveryErrorHandler.java:404) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.impl.engine.DefaultReactiveExecutor$Worker.schedule(DefaultReactiveExecutor.java:148) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.impl.engine.DefaultReactiveExecutor.scheduleMain(DefaultReactiveExecutor.java:60) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.processor.Pipeline.process(Pipeline.java:147) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:287) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.component.file.GenericFileConsumer.processExchange(GenericFileConsumer.java:483) ~[camel-file-3.5.0.jar:3.5.0]
    at org.apache.camel.component.file.GenericFileConsumer.processBatch(GenericFileConsumer.java:237) ~[camel-file-3.5.0.jar:3.5.0]
    at org.apache.camel.component.file.GenericFileConsumer.poll(GenericFileConsumer.java:198) ~[camel-file-3.5.0.jar:3.5.0]
    at org.apache.camel.support.ScheduledPollConsumer.doRun(ScheduledPollConsumer.java:190) ~[camel-support-3.5.0.jar:3.5.0]
    at org.apache.camel.support.ScheduledPollConsumer.run(ScheduledPollConsumer.java:107) ~[camel-support-3.5.0.jar:3.5.0]
    at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) ~[na:na]
    at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305) ~[na:na]
    at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305) ~[na:na]
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]
    at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]
Caused by: java.net.UnknownHostException: mycompany
    at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:220) ~[na:na]
    at java.base/java.net.Socket.connect(Socket.java:608) ~[na:na]
    at java.base/java.net.Socket.connect(Socket.java:557) ~[na:na]
    at java.base/sun.net.NetworkClient.doConnect(NetworkClient.java:182) ~[na:na]
    at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:474) ~[na:na]
    at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:569) ~[na:na]
    at java.base/sun.net.www.http.HttpClient.<init>(HttpClient.java:242) ~[na:na]
    at java.base/sun.net.www.http.HttpClient.New(HttpClient.java:341) ~[na:na]
    at java.base/sun.net.www.http.HttpClient.New(HttpClient.java:362) ~[na:na]
    at java.base/sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1253) ~[na:na]
    at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1187) ~[na:na]
    at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1081) ~[na:na]
    at java.base/sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:1015) ~[na:na]
    at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1592) ~[na:na]
    at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1520) ~[na:na]
    at com.networknt.schema.uri.URLFetcher.openConnectionCheckRedirects(URLFetcher.java:57) ~[json-schema-validator-1.0.43.jar:na]
    at com.networknt.schema.uri.URLFetcher.fetch(URLFetcher.java:43) ~[json-schema-validator-1.0.43.jar:na]
    at com.networknt.schema.uri.URISchemeFetcher.fetch(URISchemeFetcher.java:50) ~[json-schema-validator-1.0.43.jar:na]
    at com.networknt.schema.JsonSchemaFactory.getSchema(JsonSchemaFactory.java:325) ~[json-schema-validator-1.0.43.jar:na]
    ... 46 common frames omitted

【问题讨论】：

  • 这更多是关于实现的问题，而不是 JSON Schema。你是对的，$id 只是一个标识符而不是资源。许多实现都有一种手动预加载模式的方法，以便它们可以在$refs 中使用。也许为此在docs 中四处寻找？
  • 谢谢，我添加了标签 light-4j，因为它似乎是这个框架的实现。

标签： apache-camel jsonschema light-4j


【解决方案1】：

URI映射有一个配置属性，见Configuration：

  • uriMappings

公共的、通常可通过互联网访问的架构 URL 到备用位置的地图；这允许离线验证引用公共 URL 的模式。这与可能已构建的sonSchemaFactory 的任何映射合并。

此变量的类型是 Map。

修改代码：

@Bean
public JsonSchemaLoader mySchemaLoader() {

  final SchemaValidatorsConfig config = new SchemaValidatorsConfig();
  config.setUriMappings(
      Map.of("http://mycompany/test-schema2.json", "resource:/test/test-schema2.json"));

  return (camelContext, schemaStream) ->
      JsonSchemaFactory.getInstance(SpecVersion.VersionFlag.V7).getSchema(schemaStream, config);
}

【讨论】：

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