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Merge pull request #468 from metafacture/443-jsonValidator
Add JSON schema validator
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metafacture-json/src/main/java/org/metafacture/json/JsonValidator.java
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/* | ||
* Copyright 2021, 2023 Fabian Steeg, hbz | ||
* | ||
* 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 | ||
* | ||
* http://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. | ||
*/ | ||
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package org.metafacture.json; | ||
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import org.metafacture.framework.FluxCommand; | ||
import org.metafacture.framework.MetafactureException; | ||
import org.metafacture.framework.ObjectReceiver; | ||
import org.metafacture.framework.annotations.Description; | ||
import org.metafacture.framework.annotations.In; | ||
import org.metafacture.framework.annotations.Out; | ||
import org.metafacture.framework.helpers.DefaultObjectPipe; | ||
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import org.everit.json.schema.Schema; | ||
import org.everit.json.schema.ValidationException; | ||
import org.everit.json.schema.loader.SchemaClient; | ||
import org.everit.json.schema.loader.SchemaLoader; | ||
import org.everit.json.schema.loader.SchemaLoader.SchemaLoaderBuilder; | ||
import org.json.JSONException; | ||
import org.json.JSONObject; | ||
import org.json.JSONTokener; | ||
import org.slf4j.Logger; | ||
import org.slf4j.LoggerFactory; | ||
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import java.io.FileWriter; | ||
import java.io.IOException; | ||
import java.io.InputStream; | ||
import java.net.URL; | ||
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/** | ||
* Validate JSON against a given schema, pass only valid input to the receiver. | ||
* | ||
* @author Fabian Steeg (fsteeg) | ||
*/ | ||
@Description("Validate JSON against a given schema, send only valid input to the receiver. Pass the schema location to validate against. " + | ||
"Write valid and/or invalid output to locations specified with `writeValid` and `writeInvalid`. " + | ||
"Set the JSON key for the record ID value with `idKey` (for logging output, defaults to `id`).") | ||
@In(String.class) | ||
@Out(String.class) | ||
@FluxCommand("validate-json") | ||
public final class JsonValidator extends DefaultObjectPipe<String, ObjectReceiver<String>> { | ||
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private static final Logger LOG = LoggerFactory.getLogger(JsonValidator.class); | ||
private static final String DEFAULT_ID_KEY = "id"; | ||
private Schema schema; | ||
private long fail; | ||
private long success; | ||
private FileWriter writeInvalid; | ||
private FileWriter writeValid; | ||
private String idKey = DEFAULT_ID_KEY; | ||
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/** | ||
* @param url The URL of the schema to validate against. | ||
*/ | ||
public JsonValidator(final String url) { | ||
initSchema(url); | ||
} | ||
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/** | ||
* @param writeValid The location to write valid data to. | ||
*/ | ||
public void setWriteValid(final String writeValid) { | ||
this.writeValid = fileWriter(writeValid); | ||
} | ||
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/** | ||
* @param writeInvalid The location to write invalid data to. | ||
*/ | ||
public void setWriteInvalid(final String writeInvalid) { | ||
this.writeInvalid = fileWriter(writeInvalid); | ||
} | ||
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/** | ||
* @param idKey The JSON key for the record ID value. | ||
*/ | ||
public void setIdKey(final String idKey) { | ||
this.idKey = idKey; | ||
} | ||
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@Override | ||
public void process(final String json) { | ||
try { | ||
validate(json, new JSONObject(json) /* throws JSONException on syntax error */); | ||
} | ||
catch (final JSONException e) { | ||
handleInvalid(json, null, e.getMessage()); | ||
} | ||
} | ||
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private void validate(final String json, final JSONObject object) { | ||
try { | ||
schema.validate(object); // throws ValidationException if invalid | ||
getReceiver().process(json); | ||
++success; | ||
write(json, writeValid); | ||
} | ||
catch (final ValidationException e) { | ||
handleInvalid(json, object, e.getAllMessages().toString()); | ||
} | ||
} | ||
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@Override | ||
protected void onCloseStream() { | ||
close(writeInvalid); | ||
close(writeValid); | ||
LOG.debug("Success: {}, Fail: {}", success, fail); | ||
super.onCloseStream(); | ||
} | ||
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private void initSchema(final String schemaUrl) { | ||
if (schema != null) { | ||
return; | ||
} | ||
SchemaLoaderBuilder schemaLoader = SchemaLoader.builder(); | ||
try { | ||
final URL url = new URL(schemaUrl); | ||
schemaLoader = schemaLoader.schemaJson(jsonFrom(url.openStream())) | ||
.resolutionScope(baseFor(url.toString())); | ||
} | ||
catch (final IOException e) { | ||
LOG.debug("Could not read as URL: {}, trying to load from class path", schemaUrl); | ||
schemaLoader = schemaLoader.schemaClient(SchemaClient.classPathAwareClient()) | ||
.schemaJson(jsonFrom(getClass().getResourceAsStream(schemaUrl))) | ||
.resolutionScope("classpath://" + baseFor(schemaUrl)); | ||
} | ||
schema = schemaLoader.build().load().build(); | ||
} | ||
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private JSONObject jsonFrom(final InputStream inputStream) { | ||
try { | ||
return new JSONObject(new JSONTokener(inputStream)); | ||
} | ||
catch (final JSONException e) { | ||
throw new MetafactureException(e.getMessage(), e); | ||
} | ||
} | ||
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private String baseFor(final String path) { | ||
return path.substring(0, path.lastIndexOf('/') + 1); | ||
} | ||
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private FileWriter fileWriter(final String fileLocation) { | ||
try { | ||
return new FileWriter(fileLocation); | ||
} | ||
catch (final IOException e) { | ||
throw new MetafactureException(e.getMessage(), e); | ||
} | ||
} | ||
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private void handleInvalid(final String json, final JSONObject object, | ||
final String errorMessage) { | ||
LOG.info("Invalid JSON: {} in {}", errorMessage, object != null ? object.opt(idKey) : json); | ||
++fail; | ||
write(json, writeInvalid); | ||
} | ||
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private void write(final String json, final FileWriter fileWriter) { | ||
if (fileWriter != null) { | ||
try { | ||
fileWriter.append(json); | ||
fileWriter.append("\n"); | ||
} | ||
catch (final IOException e) { | ||
throw new MetafactureException(e.getMessage(), e); | ||
} | ||
} | ||
} | ||
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private void close(final FileWriter fileWriter) { | ||
if (fileWriter != null) { | ||
try { | ||
fileWriter.close(); | ||
} | ||
catch (final IOException e) { | ||
throw new MetafactureException(e.getMessage(), e); | ||
} | ||
} | ||
} | ||
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} |
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metafacture-json/src/test/java/org/metafacture/json/JsonValidatorTest.java
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/* | ||
* Copyright 2021, 2023 Fabian Steeg, hbz | ||
* | ||
* 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 | ||
* | ||
* http://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.metafacture.json; | ||
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import static org.hamcrest.CoreMatchers.both; | ||
import static org.hamcrest.CoreMatchers.containsString; | ||
import static org.junit.Assert.assertThat; | ||
import static com.github.tomakehurst.wiremock.client.WireMock.stubFor; | ||
import static com.github.tomakehurst.wiremock.client.WireMock.request; | ||
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import java.io.BufferedReader; | ||
import java.io.IOException; | ||
import java.io.InputStreamReader; | ||
import java.net.MalformedURLException; | ||
import java.net.URL; | ||
import java.nio.charset.StandardCharsets; | ||
import java.util.Arrays; | ||
import java.util.Collection; | ||
import java.util.function.Function; | ||
import java.util.stream.Collectors; | ||
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import org.junit.After; | ||
import org.junit.Before; | ||
import org.junit.Rule; | ||
import org.junit.Test; | ||
import org.junit.runner.RunWith; | ||
import org.junit.runners.Parameterized; | ||
import org.metafacture.framework.MetafactureException; | ||
import org.metafacture.framework.ObjectReceiver; | ||
import org.mockito.InOrder; | ||
import org.mockito.Mock; | ||
import org.mockito.Mockito; | ||
import org.mockito.MockitoAnnotations; | ||
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import com.github.tomakehurst.wiremock.client.WireMock; | ||
import com.github.tomakehurst.wiremock.core.WireMockConfiguration; | ||
import com.github.tomakehurst.wiremock.junit.WireMockRule; | ||
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/** | ||
* Tests for {@link JsonValidator}. | ||
* | ||
* @author Fabian Steeg | ||
* | ||
*/ | ||
@RunWith(Parameterized.class) | ||
public final class JsonValidatorTest { | ||
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private static final String MAIN_SCHEMA = "/schemas/schema.json"; | ||
private static final String ID_SCHEMA = "/schemas/id.json"; | ||
private static final String JSON_VALID = "{\"id\":\"http://example.org/\"}"; | ||
private static final String JSON_INVALID_MISSING_REQUIRED = "{}"; | ||
private static final String JSON_INVALID_URI_FORMAT= "{\"id\":\"example.org/\"}"; | ||
private static final String JSON_INVALID_DUPLICATE_KEY = "{\"id\":\"val\",\"id\":\"val\"}"; | ||
private static final String JSON_INVALID_SYNTAX_ERROR = "{\"id1\":\"val\",\"id2\":\"val\""; | ||
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private JsonValidator validator; | ||
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@Mock | ||
private ObjectReceiver<String> receiver; | ||
private InOrder inOrder; | ||
private Function<Object, String> schemaLocationGetter; | ||
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@Rule | ||
public WireMockRule wireMockRule = new WireMockRule(WireMockConfiguration.wireMockConfig() | ||
.jettyAcceptors(Runtime.getRuntime().availableProcessors()).dynamicPort()); | ||
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@Parameterized.Parameters(name = "{index}") | ||
public static Collection<Object[]> siteMaps() { | ||
return Arrays.asList((Object[][]) (new Function[][] { // | ||
// Pass the schema to each test as path on classpath, file url, and http url: | ||
{ (Object rule) -> MAIN_SCHEMA }, | ||
{ (Object rule) -> JsonValidatorTest.class.getResource(MAIN_SCHEMA).toString() }, | ||
{ (Object rule) -> ((WireMockRule) rule).baseUrl() + MAIN_SCHEMA } })); | ||
} | ||
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public JsonValidatorTest(Function<Object, String> schemaLocationGetter) { | ||
this.schemaLocationGetter = schemaLocationGetter; | ||
} | ||
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@Before | ||
public void setup() throws IOException { | ||
MockitoAnnotations.initMocks(this); | ||
wireMock(MAIN_SCHEMA, ID_SCHEMA); | ||
String schemaLocation = schemaLocationGetter.apply(wireMockRule); | ||
validator = new JsonValidator(schemaLocation); | ||
validator.setReceiver(receiver); | ||
inOrder = Mockito.inOrder(receiver); | ||
} | ||
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private void wireMock(final String... schemaLocations) throws IOException { | ||
for (String schemaLocation : schemaLocations) { | ||
stubFor(request("GET", WireMock.urlEqualTo(schemaLocation)).willReturn( | ||
WireMock.ok().withBody(readToString(getClass().getResource(schemaLocation))) | ||
.withHeader("Content-type", "application/json"))); | ||
} | ||
} | ||
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private String readToString(final URL url) throws IOException { | ||
return new BufferedReader(new InputStreamReader(url.openStream(), StandardCharsets.UTF_8)) | ||
.lines().collect(Collectors.joining("\n")); | ||
} | ||
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@Test | ||
public void callWireMockSchema() throws MalformedURLException, IOException { | ||
final String schemaContent = readToString(new URL(wireMockRule.baseUrl() + MAIN_SCHEMA)); | ||
assertThat(schemaContent, both(containsString("$schema")).and(containsString("$ref"))); | ||
} | ||
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@Test | ||
public void testShouldValidate() { | ||
validator.process(JSON_VALID); | ||
inOrder.verify(receiver, Mockito.calls(1)).process(JSON_VALID); | ||
} | ||
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@Test | ||
public void testShouldInvalidateMissingRequired() { | ||
validator.process(JSON_INVALID_MISSING_REQUIRED); | ||
inOrder.verifyNoMoreInteractions(); | ||
} | ||
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@Test | ||
public void testShouldInvalidateUriFormat() { | ||
validator.process(JSON_INVALID_URI_FORMAT); | ||
inOrder.verifyNoMoreInteractions(); | ||
} | ||
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@Test | ||
public void testShouldInvalidateDuplicateKey() { | ||
validator.process(JSON_INVALID_DUPLICATE_KEY); | ||
inOrder.verifyNoMoreInteractions(); | ||
} | ||
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@Test | ||
public void testShouldInvalidateSyntaxError() { | ||
validator.process(JSON_INVALID_SYNTAX_ERROR); | ||
inOrder.verifyNoMoreInteractions(); | ||
} | ||
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@Test(expected = MetafactureException.class) | ||
public void testShouldCatchMissingSchemaFile() { | ||
new JsonValidator("").process("{}"); | ||
} | ||
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@Test(expected = MetafactureException.class) | ||
public void testShouldCatchMissingValidOutputFile() { | ||
validator.setWriteValid(""); | ||
validator.process(JSON_INVALID_MISSING_REQUIRED); | ||
} | ||
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@Test(expected = MetafactureException.class) | ||
public void testShouldCatchMissingInvalidOutputFile() { | ||
validator.setWriteInvalid(""); | ||
validator.process(JSON_INVALID_MISSING_REQUIRED); | ||
} | ||
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@After | ||
public void cleanup() { | ||
validator.closeStream(); | ||
} | ||
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} |
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{ | ||
"$id": "id.json", | ||
"$schema": "http://json-schema.org/draft-07/schema#", | ||
"title": "URL", | ||
"description": "The URL/URI of the resource", | ||
"type": "string", | ||
"format": "uri" | ||
} |
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