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Module for the jsonschema-generator – deriving JSON Schema attributes from javax.validation annotations
/*
* Copyright 2019 VicTools.
*
* 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 com.github.victools.jsonschema.module.javax.validation;
import com.github.victools.jsonschema.generator.FieldScope;
import com.github.victools.jsonschema.generator.MemberScope;
import com.github.victools.jsonschema.generator.MethodScope;
import com.github.victools.jsonschema.generator.Module;
import com.github.victools.jsonschema.generator.SchemaGeneratorConfigBuilder;
import com.github.victools.jsonschema.generator.SchemaGeneratorConfigPart;
import java.lang.annotation.Annotation;
import java.math.BigDecimal;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.util.function.Function;
import javax.validation.constraints.DecimalMax;
import javax.validation.constraints.DecimalMin;
import javax.validation.constraints.Email;
import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import javax.validation.constraints.Negative;
import javax.validation.constraints.NegativeOrZero;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotEmpty;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Null;
import javax.validation.constraints.Pattern;
import javax.validation.constraints.Positive;
import javax.validation.constraints.PositiveOrZero;
import javax.validation.constraints.Size;
/**
* JSON Schema Generation Module: based on annotations from the {@code javax.validation.constraints} package.
*
* - Determine whether a member is not nullable, base assumption being that all fields and method return values are nullable if not annotated.
* - Optionally: also indicate all explicitly not nullable fields/methods to be required.
* - Populate "minItems" and "maxItems" for containers (i.e. arrays and collections).
* - Populate "minLength", "maxLength" and "format" for strings.
* - Optionally: populate "pattern" for strings.
* - Populate "minimum"/"exclusiveMinimum" and "maximum"/"exclusiveMaximum" for numbers.
*
*/
public class JavaxValidationModule implements Module {
private final Set options;
private Set> validationGroups;
/**
* Constructor.
*
* @param options features to enable
*/
public JavaxValidationModule(JavaxValidationOption... options) {
this.options = options == null ? Collections.emptySet() : new HashSet<>(Arrays.asList(options));
// by default: ignore validation groups
this.validationGroups = null;
}
/**
* Add validation groups to be considered.
*
* - Never calling this method will result in all annotations to be picked-up.
* - Calling this without parameters will only consider those annotations where no groups are defined.
* - Calling this with not-null parameters will only consider those annotations without defined groups or where at least one matches.
*
*
* @param validationGroups validation groups to consider
* @return this module instance (for chaining)
*/
public JavaxValidationModule forValidationGroups(Class... validationGroups) {
if (validationGroups == null) {
this.validationGroups = null;
} else {
this.validationGroups = new HashSet<>(Arrays.asList(validationGroups));
}
return this;
}
@Override
public void applyToConfigBuilder(SchemaGeneratorConfigBuilder builder) {
SchemaGeneratorConfigPart fieldConfigPart = builder.forFields();
this.applyToConfigPart(fieldConfigPart);
if (this.options.contains(JavaxValidationOption.NOT_NULLABLE_FIELD_IS_REQUIRED)) {
fieldConfigPart.withRequiredCheck(this::isRequired);
}
SchemaGeneratorConfigPart methodConfigPart = builder.forMethods();
this.applyToConfigPart(methodConfigPart);
if (this.options.contains(JavaxValidationOption.NOT_NULLABLE_METHOD_IS_REQUIRED)) {
methodConfigPart.withRequiredCheck(this::isRequired);
}
}
/**
* Apply the various annotation-based resolvers for the given configuration part (this is expected to be executed for both fields and methods).
*
* @param configPart config builder part to add configurations to
*/
private void applyToConfigPart(SchemaGeneratorConfigPart configPart) {
configPart.withNullableCheck(this::isNullable);
configPart.withArrayMinItemsResolver(this::resolveArrayMinItems);
configPart.withArrayMaxItemsResolver(this::resolveArrayMaxItems);
configPart.withStringMinLengthResolver(this::resolveStringMinLength);
configPart.withStringMaxLengthResolver(this::resolveStringMaxLength);
configPart.withStringFormatResolver(this::resolveStringFormat);
configPart.withNumberInclusiveMinimumResolver(this::resolveNumberInclusiveMinimum);
configPart.withNumberExclusiveMinimumResolver(this::resolveNumberExclusiveMinimum);
configPart.withNumberInclusiveMaximumResolver(this::resolveNumberInclusiveMaximum);
configPart.withNumberExclusiveMaximumResolver(this::resolveNumberExclusiveMaximum);
if (this.options.contains(JavaxValidationOption.INCLUDE_PATTERN_EXPRESSIONS)) {
configPart.withStringPatternResolver(this::resolveStringPattern);
}
}
/**
* Retrieves the annotation instance of the given type, either from the field itself or (if not present) from its getter.
*
* If the given field/method represents only a container item of the actual declared type, that container item's annotations are being checked.
*
* @param type of annotation
* @param member field or method to retrieve annotation instance from (or from a field's getter or getter method's field)
* @param annotationClass type of annotation
* @param validationGroupsLookup how to look-up the associated validation groups of an annotation instance
* @return annotation instance (or {@code null})
* @see MemberScope#getAnnotationConsideringFieldAndGetterIfSupported(Class)
* @see MemberScope#getContainerItemAnnotationConsideringFieldAndGetterIfSupported(Class)
*/
protected A getAnnotationFromFieldOrGetter(MemberScope member, Class annotationClass,
Function[]> validationGroupsLookup) {
A containerItemAnnotation = member.getContainerItemAnnotationConsideringFieldAndGetterIfSupported(annotationClass);
if (this.shouldConsiderAnnotation(containerItemAnnotation, validationGroupsLookup)) {
return containerItemAnnotation;
}
A annotation = member.getAnnotationConsideringFieldAndGetterIfSupported(annotationClass);
if (this.shouldConsiderAnnotation(annotation, validationGroupsLookup)) {
return annotation;
}
return null;
}
/**
* Check whether a given annotation is supposed to be considered in the schema generation. I.e. if specific validation groups are defined, it must
* belong to at least one of them.
*
* @param type of annotation
* @param annotation annotation instance (may be {@code null}, which will result in {@code false} to be returned)
* @param validationGroupsLookup how to look-up the associated validation groups of an annotation instance
* @return whether the given annotation should be considered in the current schema generation
*/
private boolean shouldConsiderAnnotation(A annotation, Function[]> validationGroupsLookup) {
// avoid repeated null checks by doing it here
if (annotation == null) {
return false;
}
// no specific validation groups means: all annotations are fair game
if (this.validationGroups == null) {
return true;
}
// check that the annotation's validation groups have at least one common entry to the configured groups on this module
Class[] associatedGroups = validationGroupsLookup.apply(annotation);
return associatedGroups.length == 0 || !Collections.disjoint(this.validationGroups, Arrays.asList(associatedGroups));
}
/**
* Determine whether a given field or method is annotated to be not nullable.
*
* @param member the field or method to check
* @return whether member is annotated as nullable or not (returns null if not specified: assumption it is nullable then)
*/
protected Boolean isNullable(MemberScope member) {
Boolean result;
if (this.getAnnotationFromFieldOrGetter(member, NotNull.class, NotNull::groups) != null
|| this.getAnnotationFromFieldOrGetter(member, NotBlank.class, NotBlank::groups) != null
|| this.getAnnotationFromFieldOrGetter(member, NotEmpty.class, NotEmpty::groups) != null) {
// field is specifically NOT nullable
result = Boolean.FALSE;
} else if (this.getAnnotationFromFieldOrGetter(member, Null.class, Null::groups) != null) {
// field is specifically null (and thereby nullable)
result = Boolean.TRUE;
} else {
result = null;
}
return result;
}
/**
* Determine whether a given field or method is deemed to be required in its parent type.
*
* @param member the field or method to check
* @return whether member is deemed to be required or not
*/
protected boolean isRequired(MemberScope member) {
Boolean nullableCheckResult = this.isNullable(member);
return Boolean.FALSE.equals(nullableCheckResult);
}
/**
* Determine a given array type's minimum number of items.
*
* @param member the field or method to check
* @return specified minimum number of array items (or null)
* @see Size
*/
protected Integer resolveArrayMinItems(MemberScope member) {
if (member.isContainerType()) {
Size sizeAnnotation = this.getAnnotationFromFieldOrGetter(member, Size.class, Size::groups);
if (sizeAnnotation != null && sizeAnnotation.min() > 0) {
// minimum length greater than the default 0 was specified
return sizeAnnotation.min();
}
if (this.getAnnotationFromFieldOrGetter(member, NotEmpty.class, NotEmpty::groups) != null) {
return 1;
}
}
return null;
}
/**
* Determine a given array type's maximum number of items.
*
* @param member the field or method to check
* @return specified maximum number of array items (or null)
* @see Size
*/
protected Integer resolveArrayMaxItems(MemberScope member) {
if (member.isContainerType()) {
Size sizeAnnotation = this.getAnnotationFromFieldOrGetter(member, Size.class, Size::groups);
if (sizeAnnotation != null && sizeAnnotation.max() < 2147483647) {
// maximum length below the default 2147483647 was specified
return sizeAnnotation.max();
}
}
return null;
}
/**
* Determine a given text type's minimum number of characters.
*
* @param member the field or method to check
* @return specified minimum number of characters (or null)
* @see Size
* @see NotEmpty
* @see NotBlank
*/
protected Integer resolveStringMinLength(MemberScope member) {
if (member.getType().isInstanceOf(CharSequence.class)) {
Size sizeAnnotation = this.getAnnotationFromFieldOrGetter(member, Size.class, Size::groups);
if (sizeAnnotation != null && sizeAnnotation.min() > 0) {
// minimum length greater than the default 0 was specified
return sizeAnnotation.min();
}
if (this.getAnnotationFromFieldOrGetter(member, NotEmpty.class, NotEmpty::groups) != null
|| this.getAnnotationFromFieldOrGetter(member, NotBlank.class, NotBlank::groups) != null) {
return 1;
}
}
return null;
}
/**
* Determine a given text type's maximum number of characters.
*
* @param member the field or method to check
* @return specified minimum number of characters (or null)
* @see Size
*/
protected Integer resolveStringMaxLength(MemberScope member) {
if (member.getType().isInstanceOf(CharSequence.class)) {
Size sizeAnnotation = this.getAnnotationFromFieldOrGetter(member, Size.class, Size::groups);
if (sizeAnnotation != null && sizeAnnotation.max() < 2147483647) {
// maximum length below the default 2147483647 was specified
return sizeAnnotation.max();
}
}
return null;
}
/**
* Determine a given text type's format.
*
* @param member the field or method to check
* @return specified format (or null)
* @see Email
*/
protected String resolveStringFormat(MemberScope member) {
if (member.getType().isInstanceOf(CharSequence.class)) {
Email emailAnnotation = this.getAnnotationFromFieldOrGetter(member, Email.class, Email::groups);
if (emailAnnotation != null) {
// @Email annotation was found, indicate the respective format
if (this.options.contains(JavaxValidationOption.PREFER_IDN_EMAIL_FORMAT)) {
// the option was set to rather return the value for the internationalised email format
return "idn-email";
}
// indicate standard internet email address format
return "email";
}
}
return null;
}
/**
* Determine a given text type's pattern.
*
* @param member the field or method to check
* @return specified pattern (or null)
* @see Pattern
*/
protected String resolveStringPattern(MemberScope member) {
if (member.getType().isInstanceOf(CharSequence.class)) {
Pattern patternAnnotation = this.getAnnotationFromFieldOrGetter(member, Pattern.class, Pattern::groups);
if (patternAnnotation != null) {
// @Pattern annotation was found, return its (mandatory) regular expression
return patternAnnotation.regexp();
}
Email emailAnnotation = this.getAnnotationFromFieldOrGetter(member, Email.class, Email::groups);
if (emailAnnotation != null && !".*".equals(emailAnnotation.regexp())) {
// non-default regular expression on @Email annotation should also be considered
return emailAnnotation.regexp();
}
}
return null;
}
/**
* Determine a number type's minimum (inclusive) value.
*
* @param member the field or method to check
* @return specified inclusive minimum value (or null)
* @see Min
* @see DecimalMin
* @see PositiveOrZero
*/
protected BigDecimal resolveNumberInclusiveMinimum(MemberScope member) {
Min minAnnotation = this.getAnnotationFromFieldOrGetter(member, Min.class, Min::groups);
if (minAnnotation != null) {
return new BigDecimal(minAnnotation.value());
}
DecimalMin decimalMinAnnotation = this.getAnnotationFromFieldOrGetter(member, DecimalMin.class, DecimalMin::groups);
if (decimalMinAnnotation != null && decimalMinAnnotation.inclusive()) {
return new BigDecimal(decimalMinAnnotation.value());
}
PositiveOrZero positiveAnnotation = this.getAnnotationFromFieldOrGetter(member, PositiveOrZero.class, PositiveOrZero::groups);
if (positiveAnnotation != null) {
return BigDecimal.ZERO;
}
return null;
}
/**
* Determine a number type's minimum (exclusive) value.
*
* @param member the field or method to check
* @return specified exclusive minimum value (or null)
* @see DecimalMin
* @see Positive
*/
protected BigDecimal resolveNumberExclusiveMinimum(MemberScope member) {
DecimalMin decimalMinAnnotation = this.getAnnotationFromFieldOrGetter(member, DecimalMin.class, DecimalMin::groups);
if (decimalMinAnnotation != null && !decimalMinAnnotation.inclusive()) {
return new BigDecimal(decimalMinAnnotation.value());
}
Positive positiveAnnotation = this.getAnnotationFromFieldOrGetter(member, Positive.class, Positive::groups);
if (positiveAnnotation != null) {
return BigDecimal.ZERO;
}
return null;
}
/**
* Determine a number type's maximum (inclusive) value.
*
* @param member the field or method to check
* @return specified inclusive maximum value (or null)
* @see Max
* @see DecimalMax#inclusive()
* @see NegativeOrZero
*/
protected BigDecimal resolveNumberInclusiveMaximum(MemberScope member) {
Max maxAnnotation = this.getAnnotationFromFieldOrGetter(member, Max.class, Max::groups);
if (maxAnnotation != null) {
return new BigDecimal(maxAnnotation.value());
}
DecimalMax decimalMaxAnnotation = this.getAnnotationFromFieldOrGetter(member, DecimalMax.class, DecimalMax::groups);
if (decimalMaxAnnotation != null && decimalMaxAnnotation.inclusive()) {
return new BigDecimal(decimalMaxAnnotation.value());
}
NegativeOrZero negativeAnnotation = this.getAnnotationFromFieldOrGetter(member, NegativeOrZero.class, NegativeOrZero::groups);
if (negativeAnnotation != null) {
return BigDecimal.ZERO;
}
return null;
}
/**
* Determine a number type's maximum (exclusive) value.
*
* @param member the field or method to check
* @return specified exclusive maximum value (or null)
* @see DecimalMax#inclusive()
* @see Negative
*/
protected BigDecimal resolveNumberExclusiveMaximum(MemberScope member) {
DecimalMax decimalMaxAnnotation = this.getAnnotationFromFieldOrGetter(member, DecimalMax.class, DecimalMax::groups);
if (decimalMaxAnnotation != null && !decimalMaxAnnotation.inclusive()) {
return new BigDecimal(decimalMaxAnnotation.value());
}
Negative negativeAnnotation = this.getAnnotationFromFieldOrGetter(member, Negative.class, Negative::groups);
if (negativeAnnotation != null) {
return BigDecimal.ZERO;
}
return null;
}
}