Github user pvillard31 commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/1037#discussion_r79831139
  
    --- Diff: 
nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/ValidateJson.java
 ---
    @@ -0,0 +1,202 @@
    +/*
    + * 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.Collection;
    +import java.util.Collections;
    +import java.util.HashSet;
    +import java.util.List;
    +import java.util.Set;
    +import java.util.Map;
    +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.components.ValidationContext;
    +import org.apache.nifi.components.ValidationResult;
    +import org.apache.nifi.components.Validator;
    +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.apache.nifi.util.StringUtils;
    +
    +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("validate-json-schema-file")
    +            .displayName("Schema File")
    +            .description("The path to the Schema file that is to be used 
for validation. Only one of Schema File or Schema Body may be used")
    +            .required(false)
    +            .addValidator(StandardValidators.FILE_EXISTS_VALIDATOR)
    +            .build();
    +
    +    public static final PropertyDescriptor SCHEMA_BODY = new 
PropertyDescriptor.Builder()
    +            .name("validate-json-schema-body")
    +            .displayName("Schema Body")
    +            .required(false)
    +            .description("Json Schema Body that is to be used for 
validation. Only one of Schema File or Schema Body may be used")
    +            .expressionLanguageSupported(false)
    +            .addValidator(Validator.VALID)
    +            .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<>();
    +
    +    /**
    +     * Custom validation for ensuring exactly one of Script File or Script 
Body is populated
    +     *
    +     * @param validationContext provides a mechanism for obtaining 
externally
    +     *                          managed values, such as property values 
and supplies convenience methods
    +     *                          for operating on those values
    +     * @return A collection of validation results
    +     */
    +    @Override
    +    protected Collection<ValidationResult> 
customValidate(ValidationContext validationContext) {
    +        Set<ValidationResult> results = new HashSet<>();
    +
    +        // Verify that exactly one of "script file" or "script body" is set
    +        Map<PropertyDescriptor, String> propertyMap = 
validationContext.getProperties();
    +        if (StringUtils.isEmpty(propertyMap.get(SCHEMA_FILE)) == 
StringUtils.isEmpty(propertyMap.get(SCHEMA_BODY))) {
    +            results.add(new 
ValidationResult.Builder().valid(false).explanation(
    +                    "Exactly one of Schema File or Schema Body must be 
set").build());
    +        }
    +
    +        return results;
    +    }
    +
    +    @Override
    +    protected void init(final ProcessorInitializationContext context) {
    +        final List<PropertyDescriptor> properties = new ArrayList<>();
    +        properties.add(SCHEMA_FILE);
    +        properties.add(SCHEMA_BODY);
    +        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 {
    +        JSONObject jsonObjectSchema;
    +        if(context.getProperty(SCHEMA_FILE).isSet()){
    +            try(FileInputStream inputStream = new FileInputStream(new 
File(context.getProperty(SCHEMA_FILE).getValue()))) {
    +                JSONTokener jsonTokener = new JSONTokener(inputStream);
    +                jsonObjectSchema = new JSONObject(jsonTokener);
    +            }
    +        } else {
    +            String rawSchema = context.getProperty(SCHEMA_BODY).getValue();
    +            jsonObjectSchema = new JSONObject(rawSchema);
    +        }
    +        Schema schema = SchemaLoader.load(jsonObjectSchema);
    +        this.schemaRef.set(schema);
    +    }
    +
    +    @Override
    +    public void onTrigger(final ProcessContext context, final 
ProcessSession session) {
    +        FlowFile flowFile = session.get();
    +        if (flowFile == null) {
    +            return;
    +        }
    +        final Schema schema = schemaRef.get();
    +        final ComponentLog logger = getLogger();
    +
    +        final AtomicBoolean valid = new AtomicBoolean(true);
    +        session.read(flowFile, new InputStreamCallback() {
    +            @Override
    +            public void process(final InputStream in) throws IOException {
    --- End diff --
    
    You can remove the IOException now


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