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FieldValidationSupport.java
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FieldValidationSupport.java
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package graphql.execution.instrumentation.fieldvalidation;
import com.google.common.collect.ImmutableList;
import graphql.ErrorType;
import graphql.GraphQLError;
import graphql.Internal;
import graphql.analysis.QueryTraverser;
import graphql.analysis.QueryVisitorFieldEnvironment;
import graphql.analysis.QueryVisitorStub;
import graphql.execution.ExecutionContext;
import graphql.execution.ResultPath;
import graphql.language.Field;
import graphql.language.SourceLocation;
import graphql.schema.GraphQLCompositeType;
import graphql.schema.GraphQLFieldDefinition;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Deque;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
@Internal
class FieldValidationSupport {
static List<GraphQLError> validateFieldsAndArguments(FieldValidation fieldValidation, ExecutionContext executionContext) {
Map<ResultPath, List<FieldAndArguments>> fieldArgumentsMap = new LinkedHashMap<>();
QueryTraverser queryTraverser = QueryTraverser.newQueryTraverser()
.schema(executionContext.getGraphQLSchema())
.document(executionContext.getDocument())
.operationName(executionContext.getOperationDefinition().getName())
.coercedVariables(executionContext.getCoercedVariables())
.build();
queryTraverser.visitPreOrder(new QueryVisitorStub() {
@Override
public void visitField(QueryVisitorFieldEnvironment env) {
Field field = env.getField();
if (field.getArguments() != null && !field.getArguments().isEmpty()) {
//
// only fields that have arguments make any sense to placed in play
// since only they have variable input
FieldAndArguments fieldArguments = new FieldAndArgumentsImpl(env);
ResultPath path = fieldArguments.getPath();
List<FieldAndArguments> list = fieldArgumentsMap.getOrDefault(path, new ArrayList<>());
list.add(fieldArguments);
fieldArgumentsMap.put(path, list);
}
}
});
FieldValidationEnvironment environment = new FieldValidationEnvironmentImpl(executionContext, fieldArgumentsMap);
//
// this will allow a consumer to plugin their own validation of fields and arguments
return fieldValidation.validateFields(environment);
}
private static class FieldAndArgumentsImpl implements FieldAndArguments {
private final QueryVisitorFieldEnvironment traversalEnv;
private final FieldAndArguments parentArgs;
private final ResultPath path;
FieldAndArgumentsImpl(QueryVisitorFieldEnvironment traversalEnv) {
this.traversalEnv = traversalEnv;
this.parentArgs = mkParentArgs(traversalEnv);
this.path = mkPath(traversalEnv);
}
private FieldAndArguments mkParentArgs(QueryVisitorFieldEnvironment traversalEnv) {
return traversalEnv.getParentEnvironment() != null ? new FieldAndArgumentsImpl(traversalEnv.getParentEnvironment()) : null;
}
private ResultPath mkPath(QueryVisitorFieldEnvironment traversalEnv) {
QueryVisitorFieldEnvironment parentEnvironment = traversalEnv.getParentEnvironment();
if (parentEnvironment == null) {
return ResultPath.rootPath().segment(traversalEnv.getField().getName());
} else {
Deque<QueryVisitorFieldEnvironment> stack = new ArrayDeque<>();
stack.push(traversalEnv);
while (parentEnvironment != null) {
stack.push(parentEnvironment);
parentEnvironment = parentEnvironment.getParentEnvironment();
}
ResultPath path = ResultPath.rootPath();
while (!stack.isEmpty()) {
QueryVisitorFieldEnvironment environment = stack.pop();
path = path.segment(environment.getField().getName());
}
return path;
}
}
@Override
public Field getField() {
return traversalEnv.getField();
}
@Override
public GraphQLFieldDefinition getFieldDefinition() {
return traversalEnv.getFieldDefinition();
}
@Override
public GraphQLCompositeType getParentType() {
return traversalEnv.getFieldsContainer();
}
@Override
public ResultPath getPath() {
return path;
}
@Override
public Map<String, Object> getArgumentValuesByName() {
return traversalEnv.getArguments();
}
@Override
@SuppressWarnings("TypeParameterUnusedInFormals")
public <T> T getArgumentValue(String argumentName) {
//noinspection unchecked
return (T) traversalEnv.getArguments().get(argumentName);
}
@Override
public FieldAndArguments getParentFieldAndArguments() {
return parentArgs;
}
}
private static class FieldValidationEnvironmentImpl implements FieldValidationEnvironment {
private final ExecutionContext executionContext;
private final Map<ResultPath, List<FieldAndArguments>> fieldArgumentsMap;
private final ImmutableList<FieldAndArguments> fieldArguments;
FieldValidationEnvironmentImpl(ExecutionContext executionContext, Map<ResultPath, List<FieldAndArguments>> fieldArgumentsMap) {
this.executionContext = executionContext;
this.fieldArgumentsMap = fieldArgumentsMap;
this.fieldArguments = fieldArgumentsMap.values().stream().flatMap(List::stream).collect(ImmutableList.toImmutableList());
}
@Override
public ExecutionContext getExecutionContext() {
return executionContext;
}
@Override
public List<FieldAndArguments> getFields() {
return fieldArguments;
}
@Override
public Map<ResultPath, List<FieldAndArguments>> getFieldsByPath() {
return fieldArgumentsMap;
}
@Override
public GraphQLError mkError(String msg) {
return new FieldAndArgError(msg, null, null);
}
@Override
public GraphQLError mkError(String msg, FieldAndArguments fieldAndArguments) {
return new FieldAndArgError(msg, fieldAndArguments.getField(), fieldAndArguments.getPath());
}
}
private static class FieldAndArgError implements GraphQLError {
private final String message;
private final List<SourceLocation> locations;
private final List<Object> path;
FieldAndArgError(String message, Field field, ResultPath path) {
this.message = message;
this.locations = field == null ? null : Collections.singletonList(field.getSourceLocation());
this.path = path == null ? null : path.toList();
}
@Override
public String getMessage() {
return message;
}
@Override
public ErrorType getErrorType() {
return ErrorType.ValidationError;
}
@Override
public List<SourceLocation> getLocations() {
return locations;
}
@Override
public List<Object> getPath() {
return path;
}
}
}