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AbstractJsonSchema.java
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AbstractJsonSchema.java
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/*
* Copyright (C) 2015 Red Hat, Inc.
*
* 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 io.fabric8.crdv2.generator;
import com.fasterxml.jackson.annotation.JsonFormat.Value;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.databind.AnnotationIntrospector;
import com.fasterxml.jackson.databind.BeanDescription;
import com.fasterxml.jackson.databind.BeanProperty;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.introspect.AnnotatedMethod;
import com.fasterxml.jackson.databind.node.JsonNodeFactory;
import com.fasterxml.jackson.module.jsonSchema.JsonSchema;
import com.fasterxml.jackson.module.jsonSchema.types.ArraySchema.Items;
import com.fasterxml.jackson.module.jsonSchema.types.ObjectSchema;
import com.fasterxml.jackson.module.jsonSchema.types.ObjectSchema.SchemaAdditionalProperties;
import com.fasterxml.jackson.module.jsonSchema.types.ReferenceSchema;
import com.fasterxml.jackson.module.jsonSchema.types.StringSchema;
import com.fasterxml.jackson.module.jsonSchema.types.ValueTypeSchema;
import io.fabric8.crd.generator.annotation.PreserveUnknownFields;
import io.fabric8.crd.generator.annotation.PrinterColumn;
import io.fabric8.crd.generator.annotation.SchemaFrom;
import io.fabric8.crd.generator.annotation.SchemaSwap;
import io.fabric8.crdv2.generator.InternalSchemaSwaps.SwapResult;
import io.fabric8.crdv2.generator.ResolvingContext.GeneratorObjectSchema;
import io.fabric8.generator.annotation.Default;
import io.fabric8.generator.annotation.Max;
import io.fabric8.generator.annotation.Min;
import io.fabric8.generator.annotation.Nullable;
import io.fabric8.generator.annotation.Pattern;
import io.fabric8.generator.annotation.Required;
import io.fabric8.generator.annotation.ValidationRule;
import io.fabric8.generator.annotation.ValidationRules;
import io.fabric8.kubernetes.api.model.GenericKubernetesResource;
import io.fabric8.kubernetes.api.model.HasMetadata;
import io.fabric8.kubernetes.api.model.IntOrString;
import io.fabric8.kubernetes.api.model.Quantity;
import io.fabric8.kubernetes.api.model.runtime.RawExtension;
import io.fabric8.kubernetes.client.utils.Utils;
import io.fabric8.kubernetes.model.annotation.LabelSelector;
import io.fabric8.kubernetes.model.annotation.SpecReplicas;
import io.fabric8.kubernetes.model.annotation.StatusReplicas;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Optional;
import java.util.Set;
import java.util.TreeMap;
import java.util.function.Consumer;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static java.util.Optional.ofNullable;
/**
* Encapsulates the common logic supporting OpenAPI schema generation for CRD generation.
*
* @param <T> the concrete type of the generated JSON Schema
* @param <V> the concrete type of the validation rule
*/
public abstract class AbstractJsonSchema<T extends KubernetesJSONSchemaProps, V extends KubernetesValidationRule> {
private static final Logger LOGGER = LoggerFactory.getLogger(AbstractJsonSchema.class);
private ResolvingContext resolvingContext;
private T root;
private Set<String> dependentClasses = new HashSet<>();
public static class AnnotationMetadata {
public final Annotation annotation;
public final KubernetesJSONSchemaProps schema;
public AnnotationMetadata(Annotation annotation, KubernetesJSONSchemaProps schema) {
this.annotation = annotation;
this.schema = schema;
}
}
private Map<Class<? extends Annotation>, LinkedHashMap<String, AnnotationMetadata>> pathMetadata = new HashMap<>();
public AbstractJsonSchema(ResolvingContext resolvingContext, Class<?> def) {
this.resolvingContext = resolvingContext;
// TODO: could make this configurable, and could stop looking for single valued ones - or warn
Stream.of(SpecReplicas.class, StatusReplicas.class, LabelSelector.class, PrinterColumn.class)
.forEach(clazz -> pathMetadata.put(clazz, new LinkedHashMap<>()));
this.root = resolveRoot(def);
}
public T getSchema() {
return root;
}
public Set<String> getDependentClasses() {
return dependentClasses;
}
public Optional<String> getSinglePath(Class<? extends Annotation> clazz) {
return ofNullable(pathMetadata.get(clazz)).flatMap(m -> m.keySet().stream().findFirst());
}
public Map<String, AnnotationMetadata> getAllPaths(Class<PrinterColumn> clazz) {
return ofNullable(pathMetadata.get(clazz)).orElse(new LinkedHashMap<>());
}
/**
* Creates the JSON schema for the class. This is template method where
* sub-classes are supposed to provide specific implementations of abstract methods.
*
* @param definition The definition.
* @param ignore a potentially empty list of property names to ignore while generating the schema
* @return The schema.
*/
private T resolveRoot(Class<?> definition) {
InternalSchemaSwaps schemaSwaps = new InternalSchemaSwaps();
JsonSchema schema = resolvingContext.toJsonSchema(definition);
if (schema instanceof GeneratorObjectSchema) {
return resolveObject(new LinkedHashMap<>(), schemaSwaps, schema, "kind", "apiVersion", "metadata");
}
return resolveProperty(new LinkedHashMap<>(), schemaSwaps, null,
resolvingContext.objectMapper.getSerializationConfig().constructType(definition), schema);
}
/**
* Walks up the class hierarchy to consume the repeating annotation
*/
private static <A extends Annotation> void consumeRepeatingAnnotation(Class<?> beanClass, Class<A> annotation,
Consumer<A> consumer) {
while (beanClass != null && beanClass != Object.class) {
Stream.of(beanClass.getAnnotationsByType(annotation)).forEach(consumer);
beanClass = beanClass.getSuperclass();
}
}
void collectValidationRules(BeanProperty beanProperty, List<V> validationRules) {
// TODO: the old logic allowed for picking up the annotation from both the getter and the field
// this requires a messy hack by convention because there doesn't seem to be a way to all annotations
// nor does jackson provide the field
if (beanProperty.getMember() instanceof AnnotatedMethod) {
// field first
Method m = ((AnnotatedMethod) beanProperty.getMember()).getMember();
String name = m.getName();
if (name.startsWith("get") || name.startsWith("set")) {
name = name.substring(3);
} else if (name.startsWith("is")) {
name = name.substring(2);
}
if (name.length() > 0) {
name = Character.toLowerCase(name.charAt(0)) + name.substring(1);
}
try {
Field f = beanProperty.getMember().getDeclaringClass().getDeclaredField(name);
ofNullable(f.getAnnotation(ValidationRule.class)).map(this::from)
.ifPresent(validationRules::add);
ofNullable(f.getAnnotation(ValidationRules.class))
.ifPresent(ann -> Stream.of(ann.value()).map(this::from).forEach(validationRules::add));
} catch (NoSuchFieldException | SecurityException e) {
}
// then method
Stream.of(m.getAnnotationsByType(ValidationRule.class)).map(this::from).forEach(validationRules::add);
return;
}
// fall back to standard logic
ofNullable(beanProperty.getAnnotation(ValidationRule.class)).map(this::from)
.ifPresent(validationRules::add);
ofNullable(beanProperty.getAnnotation(ValidationRules.class))
.ifPresent(ann -> Stream.of(ann.value()).map(this::from).forEach(validationRules::add));
}
class PropertyMetadata {
private boolean required;
private String description;
private String defaultValue;
private Double min;
private Double max;
private String pattern;
private boolean nullable;
private String format;
private List<V> validationRules = new ArrayList<>();
private boolean preserveUnknownFields;
private Class<?> schemaFrom;
public PropertyMetadata(JsonSchema value, BeanProperty beanProperty) {
required = Boolean.TRUE.equals(value.getRequired());
description = beanProperty.getMetadata().getDescription();
defaultValue = beanProperty.getMetadata().getDefaultValue();
schemaFrom = ofNullable(beanProperty.getAnnotation(SchemaFrom.class)).map(SchemaFrom::type).orElse(null);
preserveUnknownFields = beanProperty.getAnnotation(PreserveUnknownFields.class) != null;
if (value.isValueTypeSchema()) {
ValueTypeSchema valueTypeSchema = value.asValueTypeSchema();
this.format = ofNullable(valueTypeSchema.getFormat()).map(Object::toString).orElse(null);
}
if (value.isStringSchema()) {
StringSchema stringSchema = value.asStringSchema();
// only set if ValidationSchemaFactoryWrapper is used
this.pattern = stringSchema.getPattern();
this.max = ofNullable(stringSchema.getMaxLength()).map(Integer::doubleValue).orElse(null);
this.min = ofNullable(stringSchema.getMinLength()).map(Integer::doubleValue).orElse(null);
} else {
// TODO: process the other schema types for validation values
}
collectValidationRules(beanProperty, validationRules);
// TODO: should probably move to a standard annotations
// see ValidationSchemaFactoryWrapper
nullable = beanProperty.getAnnotation(Nullable.class) != null;
max = ofNullable(beanProperty.getAnnotation(Max.class)).map(Max::value).orElse(max);
min = ofNullable(beanProperty.getAnnotation(Min.class)).map(Min::value).orElse(min);
// TODO: should the following be deprecated?
required = beanProperty.getAnnotation(Required.class) != null;
defaultValue = ofNullable(beanProperty.getAnnotation(Default.class)).map(Default::value).orElse(defaultValue);
pattern = ofNullable(beanProperty.getAnnotation(Pattern.class)).map(Pattern::value).orElse(pattern);
}
public void updateSchema(T schema) {
schema.setDescription(description);
if (defaultValue != null) {
try {
schema.setDefault(resolvingContext.kubernetesSerialization.convertValue(defaultValue, JsonNode.class));
} catch (IllegalArgumentException e) {
throw new IllegalArgumentException("Cannot parse default value: '" + defaultValue + "' as valid YAML.", e);
}
}
if (nullable) {
schema.setNullable(nullable);
}
schema.setMaximum(max);
schema.setMinimum(min);
schema.setPattern(pattern);
schema.setFormat(format);
if (preserveUnknownFields) {
schema.setXKubernetesPreserveUnknownFields(true);
}
addToValidationRules(schema, validationRules);
}
}
private T resolveObject(LinkedHashMap<String, String> visited, InternalSchemaSwaps schemaSwaps, JsonSchema jacksonSchema,
String... ignore) {
Set<String> ignores = ignore.length > 0 ? new LinkedHashSet<>(Arrays.asList(ignore)) : Collections.emptySet();
final T objectSchema = singleProperty("object");
schemaSwaps = schemaSwaps.branchAnnotations();
final InternalSchemaSwaps swaps = schemaSwaps;
GeneratorObjectSchema gos = (GeneratorObjectSchema) jacksonSchema.asObjectSchema();
AnnotationIntrospector ai = resolvingContext.objectMapper.getSerializationConfig().getAnnotationIntrospector();
BeanDescription bd = resolvingContext.objectMapper.getSerializationConfig().introspect(gos.javaType);
boolean preserveUnknownFields = false;
if (resolvingContext.implicitPreserveUnknownFields) {
preserveUnknownFields = bd.findAnyGetter() != null || bd.findAnySetterAccessor() != null;
}
Class<?> rawClass = gos.javaType.getRawClass();
collectDependentClasses(rawClass);
consumeRepeatingAnnotation(rawClass, SchemaSwap.class, ss -> {
swaps.registerSwap(rawClass,
ss.originalType(),
ss.fieldName(),
ss.targetType(), ss.depth());
});
List<String> required = new ArrayList<>();
for (Map.Entry<String, JsonSchema> property : new TreeMap<>(gos.getProperties()).entrySet()) {
String name = property.getKey();
if (ignores.contains(name)) {
continue;
}
schemaSwaps = schemaSwaps.branchDepths();
SwapResult swapResult = schemaSwaps.lookupAndMark(rawClass, name);
LinkedHashMap<String, String> savedVisited = visited;
if (swapResult.onGoing) {
visited = new LinkedHashMap<>();
}
BeanProperty beanProperty = gos.beanProperties.get(property.getKey());
Utils.checkNotNull(beanProperty, "CRD generation works only with bean properties");
JsonSchema propertySchema = property.getValue();
PropertyMetadata propertyMetadata = new PropertyMetadata(propertySchema, beanProperty);
// fallback to the JsonFormat pattern - currently not handled by the Jackson schema logic
if (propertyMetadata.pattern == null) {
propertyMetadata.pattern = ofNullable(ai.findFormat(beanProperty.getMember())).map(Value::getPattern)
.filter(Utils::isNotNullOrEmpty).orElse(null);
}
if (propertyMetadata.required) {
required.add(name);
}
JavaType type = beanProperty.getType();
if (swapResult.classRef != null) {
propertyMetadata.schemaFrom = swapResult.classRef;
}
if (propertyMetadata.schemaFrom != null) {
if (propertyMetadata.schemaFrom == void.class) {
// fully omit - this is a little inconsistent with the NullSchema handling
continue;
}
propertySchema = resolvingContext.toJsonSchema(propertyMetadata.schemaFrom);
type = resolvingContext.objectMapper.getSerializationConfig().constructType(propertyMetadata.schemaFrom);
}
T schema = resolveProperty(visited, schemaSwaps, name, type, propertySchema);
propertyMetadata.updateSchema(schema);
if (!swapResult.onGoing) {
for (Entry<Class<? extends Annotation>, LinkedHashMap<String, AnnotationMetadata>> entry : pathMetadata.entrySet()) {
ofNullable(beanProperty.getAnnotation(entry.getKey())).ifPresent(
ann -> entry.getValue().put(toFQN(savedVisited, name),
new AnnotationMetadata(ann, schema)));
}
}
visited = savedVisited;
addProperty(name, objectSchema, schema);
}
swaps.throwIfUnmatchedSwaps();
objectSchema.setRequired(required);
if (preserveUnknownFields) {
objectSchema.setXKubernetesPreserveUnknownFields(true);
}
List<V> validationRules = new ArrayList<>();
consumeRepeatingAnnotation(rawClass, ValidationRule.class,
v -> validationRules.add(from(v)));
addToValidationRules(objectSchema, validationRules);
return objectSchema;
}
private void collectDependentClasses(Class<?> rawClass) {
Stream.of(rawClass.getInterfaces()).map(Class::getName).forEach(dependentClasses::add);
while (rawClass != null) {
dependentClasses.add(rawClass.getName());
rawClass = rawClass.getSuperclass();
}
}
static String toFQN(LinkedHashMap<String, String> visited, String name) {
if (visited.isEmpty()) {
return "." + name;
}
return visited.values().stream().collect(Collectors.joining(".", ".", ".")) + name;
}
private T resolveProperty(LinkedHashMap<String, String> visited, InternalSchemaSwaps schemaSwaps, String name,
JavaType type, JsonSchema jacksonSchema) {
if (jacksonSchema.isArraySchema()) {
Items items = jacksonSchema.asArraySchema().getItems();
if (items.isArrayItems()) {
throw new IllegalStateException("not yet supported");
}
JsonSchema arraySchema = jacksonSchema.asArraySchema().getItems().asSingleItems().getSchema();
final T schema = resolveProperty(visited, schemaSwaps, name, type.getContentType(), arraySchema);
return arrayLikeProperty(schema);
} else if (jacksonSchema.isIntegerSchema()) {
return singleProperty("integer");
} else if (jacksonSchema.isNumberSchema()) {
return singleProperty("number");
} else if (jacksonSchema.isBooleanSchema()) {
return singleProperty("boolean");
} else if (jacksonSchema.isStringSchema()) {
// currently on string enums are supported
StringSchema stringSchema = jacksonSchema.asStringSchema();
if (!stringSchema.getEnums().isEmpty()) {
Set<String> ignores = type.isEnumType() ? findIgnoredEnumConstants(type) : Collections.emptySet();
final JsonNode[] enumValues = stringSchema.getEnums().stream()
.sorted()
.filter(s -> !ignores.contains(s))
.map(JsonNodeFactory.instance::textNode)
.toArray(JsonNode[]::new);
return enumProperty(enumValues);
}
return singleProperty("string");
} else if (jacksonSchema.isNullSchema()) {
return singleProperty("object"); // TODO: this may not be the right choice, but rarely will someone be using Void
} else if (jacksonSchema.isAnySchema()) {
if (type.getRawClass() == IntOrString.class || type.getRawClass() == Quantity.class) {
// TODO: create a serializer for this and remove this override
// - that won't work currently as there's no way to create a UnionSchema from the Jackson api
return intOrString();
}
if (type.getRawClass() == RawExtension.class) {
return raw();
}
// TODO: this could optionally take a type restriction
T schema = singleProperty(null);
schema.setXKubernetesPreserveUnknownFields(true);
return schema;
} else if (jacksonSchema.isUnionTypeSchema()) {
throw new IllegalStateException("not yet supported");
} else if (jacksonSchema instanceof ReferenceSchema) {
// de-reference the reference schema - these can be naturally non-cyclic, for example siblings
ReferenceSchema ref = (ReferenceSchema) jacksonSchema;
GeneratorObjectSchema referenced = resolvingContext.uriToJacksonSchema.get(ref.get$ref());
Utils.checkNotNull(referenced, "Could not find previously generated schema");
jacksonSchema = referenced;
} else if (type.isMapLikeType()) {
final JavaType keyType = type.getKeyType();
if (keyType.getRawClass() != String.class) {
LOGGER.warn("Property '{}' with '{}' key type is mapped to 'string' because of CRD schemas limitations", name, keyType);
}
final JavaType valueType = type.getContentType();
JsonSchema mapValueSchema = ((SchemaAdditionalProperties) ((ObjectSchema) jacksonSchema).getAdditionalProperties())
.getJsonSchema();
T component = resolveProperty(visited, schemaSwaps, name, valueType, mapValueSchema);
return mapLikeProperty(component);
}
Class<?> def = type.getRawClass();
// KubernetesResource is too broad, but we can check for several common subclasses
if (def == GenericKubernetesResource.class
|| (def.isInterface() && HasMetadata.class.isAssignableFrom(def))) {
return raw();
}
if (visited.put(def.getName(), name) != null) {
throw new IllegalArgumentException(
"Found a cyclic reference involving the field of type " + def.getName() + " starting a field "
+ visited.entrySet().stream().map(e -> e.getValue() + " >>\n" + e.getKey()).collect(Collectors.joining(".")) + "."
+ name);
}
T res = resolveObject(visited, schemaSwaps, jacksonSchema);
visited.remove(def.getName());
return res;
}
/**
* we've added support for ignoring an enum values, which complicates this processing
* as that is something not supported directly by jackson
*/
private Set<String> findIgnoredEnumConstants(JavaType type) {
Field[] fields = type.getRawClass().getFields();
Set<String> toIgnore = new HashSet<>();
for (Field field : fields) {
if (field.isEnumConstant() && field.getAnnotation(JsonIgnore.class) != null) {
// hack to figure out the enum constant - this guards against some using both JsonIgnore and JsonProperty
try {
Object value = field.get(null);
toIgnore.add(resolvingContext.objectMapper.convertValue(value, String.class));
} catch (IllegalArgumentException | IllegalAccessException e) {
}
}
}
return toIgnore;
}
V from(ValidationRule validationRule) {
V result = newKubernetesValidationRule();
result.setRule(validationRule.value());
result.setReason(mapNotEmpty(validationRule.reason()));
result.setMessage(mapNotEmpty(validationRule.message()));
result.setMessageExpression(mapNotEmpty(validationRule.messageExpression()));
result.setFieldPath(mapNotEmpty(validationRule.fieldPath()));
result.setOptionalOldSelf(validationRule.optionalOldSelf() ? true : null);
return result;
}
private static String mapNotEmpty(String s) {
return Utils.isNullOrEmpty(s) ? null : s;
}
protected abstract V newKubernetesValidationRule();
/**
* Adds the specified property to the specified builder
*
* @param name the property to add to the currently being built schema
* @param objectSchema the schema being built
* @param schema the built schema for the property being added
*/
protected abstract void addProperty(String name, T objectSchema, T schema);
/**
* Builds the schema for specifically for intOrString properties
*
* @return the property schema
*/
protected abstract T intOrString();
/**
* Builds the schema for array-like properties
*
* @param schema the schema for the extracted element type for this array-like property
* @return the schema for the array-like property
*/
protected abstract T arrayLikeProperty(T schema);
/**
* Builds the schema for map-like properties
*
* @param schema the schema for the extracted element type for the values of this map-like property
* @return the schema for the map-like property
*/
protected abstract T mapLikeProperty(T schema);
/**
* Builds the schema for standard, simple (e.g. string) property types
*
* @param typeName the mapped name of the property type
* @return the schema for the property
*/
protected abstract T singleProperty(String typeName);
protected abstract T enumProperty(JsonNode... enumValues);
protected abstract void addToValidationRules(T schema, List<V> validationRules);
protected abstract T raw();
}