Github user bartoszjkwozniak commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/1037#discussion_r79778863
  
    --- Diff: 
nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/ValidateJson.java
 ---
    @@ -0,0 +1,159 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one or more
    + * contributor license agreements.  See the NOTICE file distributed with
    + * this work for additional information regarding copyright ownership.
    + * The ASF licenses this file to You 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.apache.nifi.processors.standard;
    +
    +import java.io.File;
    +import java.io.FileInputStream;
    +import java.io.IOException;
    +import java.io.InputStream;
    +import java.nio.charset.StandardCharsets;
    +import java.util.ArrayList;
    +import java.util.Collections;
    +import java.util.HashSet;
    +import java.util.List;
    +import java.util.Set;
    +import java.util.concurrent.atomic.AtomicBoolean;
    +import java.util.concurrent.atomic.AtomicReference;
    +
    +import org.apache.commons.io.IOUtils;
    +import org.apache.nifi.annotation.behavior.EventDriven;
    +import org.apache.nifi.annotation.behavior.InputRequirement;
    +import org.apache.nifi.annotation.behavior.InputRequirement.Requirement;
    +import org.apache.nifi.annotation.behavior.SideEffectFree;
    +import org.apache.nifi.annotation.behavior.SupportsBatching;
    +import org.apache.nifi.annotation.documentation.CapabilityDescription;
    +import org.apache.nifi.annotation.documentation.Tags;
    +import org.apache.nifi.annotation.lifecycle.OnScheduled;
    +import org.apache.nifi.components.PropertyDescriptor;
    +import org.apache.nifi.flowfile.FlowFile;
    +import org.apache.nifi.logging.ComponentLog;
    +import org.apache.nifi.processor.AbstractProcessor;
    +import org.apache.nifi.processor.ProcessContext;
    +import org.apache.nifi.processor.ProcessSession;
    +import org.apache.nifi.processor.ProcessorInitializationContext;
    +import org.apache.nifi.processor.Relationship;
    +import org.apache.nifi.processor.io.InputStreamCallback;
    +import org.apache.nifi.processor.util.StandardValidators;
    +
    +import org.everit.json.schema.Schema;
    +import org.everit.json.schema.ValidationException;
    +import org.everit.json.schema.loader.SchemaLoader;
    +import org.json.JSONArray;
    +import org.json.JSONObject;
    +import org.json.JSONTokener;
    +
    +
    +@EventDriven
    +@SideEffectFree
    +@SupportsBatching
    +@InputRequirement(Requirement.INPUT_REQUIRED)
    +@Tags({"json", "schema", "validation"})
    +@CapabilityDescription("Validates the contents of FlowFiles against a 
user-specified JSON Schema file")
    +public class ValidateJson extends AbstractProcessor {
    +
    +    public static final PropertyDescriptor SCHEMA_FILE = new 
PropertyDescriptor.Builder()
    +            .name("Schema File")
    +            .description("The path to the Schema file that is to be used 
for validation")
    +            .required(true)
    +            .addValidator(StandardValidators.FILE_EXISTS_VALIDATOR)
    +            .build();
    +
    +    public static final Relationship REL_VALID = new Relationship.Builder()
    +            .name("valid")
    +            .description("FlowFiles that are successfully validated 
against the schema are routed to this relationship")
    +            .build();
    +    public static final Relationship REL_INVALID = new 
Relationship.Builder()
    +            .name("invalid")
    +            .description("FlowFiles that are not valid according to the 
specified schema are routed to this relationship")
    +            .build();
    +
    +    private List<PropertyDescriptor> properties;
    +    private Set<Relationship> relationships;
    +    private final AtomicReference<Schema> schemaRef = new 
AtomicReference<>();
    +
    +    @Override
    +    protected void init(final ProcessorInitializationContext context) {
    +        final List<PropertyDescriptor> properties = new ArrayList<>();
    +        properties.add(SCHEMA_FILE);
    +        this.properties = Collections.unmodifiableList(properties);
    +
    +        final Set<Relationship> relationships = new HashSet<>();
    +        relationships.add(REL_VALID);
    +        relationships.add(REL_INVALID);
    +        this.relationships = Collections.unmodifiableSet(relationships);
    +    }
    +
    +    @Override
    +    public Set<Relationship> getRelationships() {
    +        return relationships;
    +    }
    +
    +    @Override
    +    protected List<PropertyDescriptor> getSupportedPropertyDescriptors() {
    +        return properties;
    +    }
    +
    +    @OnScheduled
    +    public void parseSchema(final ProcessContext context) throws 
IOException {
    +        try(FileInputStream inputStream = new FileInputStream(new 
File(context.getProperty(SCHEMA_FILE).getValue()))) {
    +            JSONTokener jsonTokener = new JSONTokener(inputStream);
    +            JSONObject jsonObject = new JSONObject(jsonTokener);
    +            Schema schema = SchemaLoader.load(jsonObject);
    +            this.schemaRef.set(schema);
    +        }
    +    }
    +
    +    @Override
    +    public void onTrigger(final ProcessContext context, final 
ProcessSession session) {
    +        final List<FlowFile> flowFiles = session.get(50);
    +        if (flowFiles.isEmpty()) {
    +            return;
    +        }
    +        final Schema schema = schemaRef.get();
    +        final ComponentLog logger = getLogger();
    +
    +        for (final FlowFile flowFile : flowFiles) {
    +            final AtomicBoolean valid = new AtomicBoolean(true);
    +            session.read(flowFile, new InputStreamCallback() {
    +                @Override
    +                public void process(final InputStream in) throws 
IOException {
    +                    try {
    +                        String str = IOUtils.toString(in, 
StandardCharsets.UTF_8);
    +                        if (str.startsWith("[")) {
    +                            schema.validate(new JSONArray(str)); // throws 
a ValidationException if this object is invalid
    +                        } else {
    +                            schema.validate(new JSONObject(str)); // 
throws a ValidationException if this object is invalid
    +                        }
    +                    } catch (final IllegalArgumentException | 
ValidationException e) {
    +                        valid.set(false);
    +                        logger.debug("Failed to validate {} against schema 
due to {}", new Object[]{flowFile, e});
    +                    }
    +                }
    +            });
    +
    +            if (valid.get()) {
    +                logger.info("Successfully validated {} against schema; 
routing to 'valid'", new Object[]{flowFile});
    +                session.getProvenanceReporter().route(flowFile, REL_VALID);
    +                session.transfer(flowFile, REL_VALID);
    +            } else {
    +                logger.info("Failed to validate {} against schema; routing 
to 'invalid'", new Object[]{flowFile});
    --- End diff --
    
    done


---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---

Reply via email to