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A framework for building RESTful web APIs.
/*
* Copyright 2016 Google Inc. All Rights Reserved.
*
* 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.google.api.server.spi.config.annotationreader;
import com.google.api.server.spi.EndpointMethod;
import com.google.api.server.spi.MethodHierarchyReader;
import com.google.api.server.spi.ServiceContext;
import com.google.api.server.spi.TypeLoader;
import com.google.api.server.spi.config.AnnotationBoolean;
import com.google.api.server.spi.config.ApiConfigException;
import com.google.api.server.spi.config.ApiConfigSource;
import com.google.api.server.spi.config.ApiIssuer;
import com.google.api.server.spi.config.ApiIssuerAudience;
import com.google.api.server.spi.config.AuthLevel;
import com.google.api.server.spi.config.Authenticator;
import com.google.api.server.spi.config.PeerAuthenticator;
import com.google.api.server.spi.config.Transformer;
import com.google.api.server.spi.config.model.ApiClassConfig;
import com.google.api.server.spi.config.model.ApiConfig;
import com.google.api.server.spi.config.model.ApiIssuerAudienceConfig;
import com.google.api.server.spi.config.model.ApiIssuerConfigs;
import com.google.api.server.spi.config.model.ApiMethodConfig;
import com.google.api.server.spi.config.model.ApiParameterConfig;
import com.google.api.server.spi.config.model.ApiSerializationConfig;
import com.google.common.collect.Lists;
import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.util.List;
import java.util.Map;
import javax.annotation.Nullable;
/**
* Reads annotations on endpoint classes to produce an api configuration.
*
* @author Eric Orth
*/
public class ApiConfigAnnotationReader implements ApiConfigSource {
private final Map> annotationTypes;
public ApiConfigAnnotationReader() throws ClassNotFoundException {
this((new TypeLoader(ApiConfigAnnotationReader.class.getClassLoader())).getAnnotationTypes());
}
public ApiConfigAnnotationReader(Map> annotationTypes) {
this.annotationTypes = annotationTypes;
}
@Override
public void loadEndpointClass(ServiceContext serviceContext, Class endpointClass,
ApiConfig config) throws ApiConfigException {
try {
Annotation api = getDeclaredAnnotation(endpointClass, annotationTypes.get("Api"));
Annotation apiClass = getDeclaredAnnotation(endpointClass, annotationTypes.get("ApiClass"));
if (!readEndpointClass(config, endpointClass, api, apiClass, endpointClass)) {
throw new ApiConfigException(endpointClass + " has no @Api annotation.");
}
} catch (InvocationTargetException | NoSuchMethodException | IllegalAccessException e) {
throw new ApiConfigException(e);
}
}
@Override
public void loadEndpointMethods(ServiceContext serviceContext, Class endpointClass,
ApiClassConfig.MethodConfigMap methodConfigMap) throws ApiConfigException {
try {
readEndpointMethods(endpointClass, methodConfigMap);
} catch (InvocationTargetException | NoSuchMethodException | IllegalAccessException e) {
throw new ApiConfigException(e);
}
}
@Override
public boolean isStaticConfig(ApiConfig config) {
return true;
}
@Nullable private Class determineInheritanceSource(Class endpointClass)
throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
Class inheritanceSource = null;
// First attempt to follow any @ApiReference annotation.
Annotation reference =
getDeclaredAnnotation(endpointClass, annotationTypes.get("ApiReference"));
if (reference != null) {
inheritanceSource = getAnnotationProperty(reference, "value");
}
// Second try inheriting from a superclass.
if (inheritanceSource == null) {
inheritanceSource = endpointClass.getSuperclass();
}
return inheritanceSource;
}
/**
* Detect inheritance cycles using Floyd's cycle-finding algorithm
* (See http://en.wikipedia.org/wiki/Cycle_detection#Tortoise_and_hare).
*
* @param endpointClass The class currently being parsed. Used as the tortoise pointer for the
* cycle detection.
* @param cycleCheck The hare pointer. Either the last pointer returned by this function or
* {@code null} if an end has already been reached.
* @return The new {@code cycleCheck} hare pointer or {@code null} if an end has already been
* reached.
*/
@Nullable private Class checkForInheritanceCycle(Class endpointClass,
@Nullable Class cycleCheck) throws IllegalAccessException, InvocationTargetException,
NoSuchMethodException, CyclicApiInheritanceException {
for (int i = 0; cycleCheck != null && i < 2; ++i) {
cycleCheck = determineInheritanceSource(cycleCheck);
}
if (endpointClass.equals(cycleCheck)) {
throw new CyclicApiInheritanceException(endpointClass);
}
return cycleCheck;
}
@SuppressWarnings("unchecked")
private boolean readEndpointClass(ApiConfig config, Class endpointClass, Annotation api,
Annotation apiClass, @Nullable Class cycleCheck) throws NoSuchMethodException,
IllegalAccessException, InvocationTargetException, CyclicApiInheritanceException {
cycleCheck = checkForInheritanceCycle(endpointClass, cycleCheck);
boolean hasAnnotation = api != null;
Class inheritanceSource = determineInheritanceSource(endpointClass);
if (inheritanceSource != null) {
Annotation superApi = getDeclaredAnnotation(inheritanceSource, annotationTypes.get("Api"));
Annotation superApiClass =
getDeclaredAnnotation(inheritanceSource, annotationTypes.get("ApiClass"));
hasAnnotation |=
readEndpointClass(config, inheritanceSource, superApi, superApiClass, cycleCheck);
}
if (api != null) {
readApi(new ApiAnnotationConfig(config), api);
readApiAuth(new ApiAuthAnnotationConfig(config.getAuthConfig()),
(Annotation) getAnnotationProperty(api, "auth"));
readApiFrontendLimits(new ApiFrontendLimitsAnnotationConfig(config.getFrontendLimitsConfig()),
(Annotation) getAnnotationProperty(api, "frontendLimits"));
readApiCacheControl(new ApiCacheControlAnnotationConfig(config.getCacheControlConfig()),
(Annotation) getAnnotationProperty(api, "cacheControl"));
readApiNamespace(new ApiNamespaceAnnotationConfig(config.getNamespaceConfig()),
(Annotation) getAnnotationProperty(api, "namespace"));
readSerializers(config.getSerializationConfig(),
(Class>[]) getAnnotationProperty(api, "transformers"));
}
if (apiClass != null) {
readApiClass(new ApiClassAnnotationConfig(config.getApiClassConfig()), apiClass);
}
return hasAnnotation;
}
private void readApi(ApiAnnotationConfig config, Annotation api)
throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {
config.setIsAbstractIfSpecified((AnnotationBoolean) getAnnotationProperty(api, "isAbstract"));
config.setRootIfNotEmpty((String) getAnnotationProperty(api, "root"));
config.setNameIfNotEmpty((String) getAnnotationProperty(api, "name"));
config.setCanonicalNameIfNotEmpty((String) getAnnotationProperty(api, "canonicalName"));
config.setVersionIfNotEmpty((String) getAnnotationProperty(api, "version"));
config.setTitleIfNotEmpty((String) getAnnotationProperty(api, "title"));
config.setDescriptionIfNotEmpty((String) getAnnotationProperty(api, "description"));
config.setDocumentationLinkIfNotEmpty((String) getAnnotationProperty(api, "documentationLink"));
config.setIsDefaultVersionIfSpecified(
(AnnotationBoolean) getAnnotationProperty(api, "defaultVersion"));
config.setIsDiscoverableIfSpecified(
(AnnotationBoolean) getAnnotationProperty(api, "discoverable"));
config.setUseDatastoreIfSpecified(
(AnnotationBoolean) getAnnotationProperty(api, "useDatastoreForAdditionalConfig"));
config.setBackendRootIfNotEmpty((String) getAnnotationProperty(api, "backendRoot"));
config.setResourceIfNotEmpty((String) getAnnotationProperty(api, "resource"));
config.setAuthLevelIfSpecified((AuthLevel) getAnnotationProperty(api, "authLevel"));
config.setScopesIfSpecified((String[]) getAnnotationProperty(api, "scopes"));
config.setAudiencesIfSpecified((String[]) getAnnotationProperty(api, "audiences"));
config.setIssuersIfSpecified(getIssuerConfigs(api));
config.setIssuerAudiencesIfSpecified(getIssuerAudiences(api));
config.setClientIdsIfSpecified((String[]) getAnnotationProperty(api, "clientIds"));
config.setAuthenticatorsIfSpecified(
this.[]>getAnnotationProperty(api, "authenticators"));
config.setPeerAuthenticatorsIfSpecified(this
.[]>getAnnotationProperty(api, "peerAuthenticators"));
}
private ApiIssuerConfigs getIssuerConfigs(Annotation annotation)
throws IllegalAccessException, NoSuchMethodException, InvocationTargetException {
return IssuerUtil.toConfig((ApiIssuer[]) getAnnotationProperty(annotation, "issuers"));
}
private ApiIssuerAudienceConfig getIssuerAudiences(Annotation annotation)
throws IllegalAccessException, NoSuchMethodException, InvocationTargetException {
return IssuerUtil.toConfig((ApiIssuerAudience[]) getAnnotationProperty(annotation, "issuerAudiences"),
(String[]) getAnnotationProperty(annotation, "audiences"));
}
private T getAnnotationProperty(Annotation annotation, String name)
throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
@SuppressWarnings("unchecked")
T value = (T) annotation.annotationType().getMethod(name).invoke(annotation);
return value;
}
/**
* Converts the auth config from the auth annotation. Subclasses may override
* to add additional information to the auth config.
*/
protected void readApiAuth(ApiAuthAnnotationConfig config, Annotation auth)
throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {
config.setAllowCookieAuthIfSpecified(
(AnnotationBoolean) getAnnotationProperty(auth, "allowCookieAuth"));
config.setBlockedRegionsIfNotEmpty((String[]) getAnnotationProperty(auth, "blockedRegions"));
}
private void readApiFrontendLimits(ApiFrontendLimitsAnnotationConfig config,
Annotation frontendLimits) throws NoSuchMethodException, IllegalAccessException,
InvocationTargetException {
config.setUnregisteredUserQpsIfSpecified(
(Integer) getAnnotationProperty(frontendLimits, "unregisteredUserQps"));
config.setUnregisteredQpsIfSpecified(
(Integer) getAnnotationProperty(frontendLimits, "unregisteredQps"));
config.setUnregisteredDailyIfSpecified(
(Integer) getAnnotationProperty(frontendLimits, "unregisteredDaily"));
readApiFrontendLimitRules(config,
(Annotation[]) getAnnotationProperty(frontendLimits, "rules"));
}
private void readSerializers(
ApiSerializationConfig config, Class>[] serializers) {
for (Class> serializer : serializers) {
config.addSerializationConfig(serializer);
}
}
private void readApiCacheControl(ApiCacheControlAnnotationConfig config, Annotation cacheControl)
throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {
config.setTypeIfNotEmpty((String) getAnnotationProperty(cacheControl, "type"));
config.setMaxAgeIfSpecified((Integer) getAnnotationProperty(cacheControl, "maxAge"));
}
protected void readApiNamespace(ApiNamespaceAnnotationConfig config, Annotation namespace)
throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
config.setOwnerDomainIfNotEmpty((String) getAnnotationProperty(namespace, "ownerDomain"));
config.setOwnerNameIfNotEmpty((String) getAnnotationProperty(namespace, "ownerName"));
config.setPackagePathIfNotEmpty((String) getAnnotationProperty(namespace, "packagePath"));
}
private void readApiFrontendLimitRules(ApiFrontendLimitsAnnotationConfig config,
Annotation[] rules) throws NoSuchMethodException, IllegalAccessException,
InvocationTargetException {
for (Annotation rule : rules) {
String match = getAnnotationProperty(rule, "match");
int qps = (Integer) getAnnotationProperty(rule, "qps");
int userQps = (Integer) getAnnotationProperty(rule, "userQps");
int daily = (Integer) getAnnotationProperty(rule, "daily");
String analyticsId = getAnnotationProperty(rule, "analyticsId");
config.getConfig().addRule(match, qps, userQps, daily, analyticsId);
}
}
private void readApiClass(ApiClassAnnotationConfig config, Annotation apiClass)
throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
config.setResourceIfNotEmpty((String) getAnnotationProperty(apiClass, "resource"));
config.setAuthLevelIfSpecified((AuthLevel) getAnnotationProperty(apiClass, "authLevel"));
config.setScopesIfSpecified((String[]) getAnnotationProperty(apiClass, "scopes"));
config.setAudiencesIfSpecified((String[]) getAnnotationProperty(apiClass, "audiences"));
config.setIssuerAudiencesIfSpecified(getIssuerAudiences(apiClass));
config.setClientIdsIfSpecified((String[]) getAnnotationProperty(apiClass, "clientIds"));
config.setAuthenticatorsIfSpecified(
this.[]>getAnnotationProperty(apiClass, "authenticators"));
config.setPeerAuthenticatorsIfSpecified(this.<
Class[]>getAnnotationProperty(apiClass, "peerAuthenticators"));
config.setUseDatastoreIfSpecified(
(AnnotationBoolean) getAnnotationProperty(apiClass, "useDatastoreForAdditionalConfig"));
}
private void readEndpointMethods(Class endpointClass,
ApiClassConfig.MethodConfigMap methodConfigMap)
throws IllegalArgumentException, SecurityException, IllegalAccessException,
InvocationTargetException, NoSuchMethodException {
MethodHierarchyReader methodReader = new MethodHierarchyReader(endpointClass);
Iterable> methods = methodReader.getEndpointOverrides();
for (List overrides : methods) {
readEndpointMethod(methodConfigMap, overrides);
}
}
private void readEndpointMethod(ApiClassConfig.MethodConfigMap methodConfigMap,
List overrides)
throws IllegalArgumentException, SecurityException, IllegalAccessException,
InvocationTargetException, NoSuchMethodException {
Class apiMethodClass = annotationTypes.get("ApiMethod");
final EndpointMethod finalMethod = overrides.get(0);
ApiMethodConfig methodConfig = methodConfigMap.getOrCreate(finalMethod);
readMethodRequestParameters(finalMethod, methodConfig);
// Process overrides in reverse order.
for (EndpointMethod method : Lists.reverse(overrides)) {
Annotation apiMethod = method.getMethod().getAnnotation(apiMethodClass);
if (apiMethod != null) {
readApiMethodInstance(new ApiMethodAnnotationConfig(methodConfig), apiMethod);
}
}
}
private void readApiMethodInstance(ApiMethodAnnotationConfig config, Annotation apiMethod)
throws IllegalArgumentException, SecurityException, IllegalAccessException,
InvocationTargetException, NoSuchMethodException {
config.setNameIfNotEmpty((String) getAnnotationProperty(apiMethod, "name"));
config.setPathIfNotEmpty((String) getAnnotationProperty(apiMethod, "path"));
config.setHttpMethodIfNotEmpty((String) getAnnotationProperty(apiMethod, "httpMethod"));
config.setAuthLevelIfSpecified((AuthLevel) getAnnotationProperty(apiMethod, "authLevel"));
config.setScopesIfSpecified((String[]) getAnnotationProperty(apiMethod, "scopes"));
config.setAudiencesIfSpecified((String[]) getAnnotationProperty(apiMethod, "audiences"));
config.setIssuerAudiencesIfSpecified(getIssuerAudiences(apiMethod));
config.setClientIdsIfSpecified((String[]) getAnnotationProperty(apiMethod, "clientIds"));
config.setAuthenticatorsIfSpecified(
this.[]>getAnnotationProperty(apiMethod, "authenticators"));
config.setPeerAuthenticatorsIfSpecified(this.<
Class[]>getAnnotationProperty(apiMethod,
"peerAuthenticators"));
config.setIgnoredIfSpecified((AnnotationBoolean) getAnnotationProperty(apiMethod, "ignored"));
}
private void readMethodRequestParameters(EndpointMethod endpointMethod,
ApiMethodConfig methodConfig) throws IllegalArgumentException, SecurityException,
IllegalAccessException, InvocationTargetException, NoSuchMethodException {
Method method = endpointMethod.getMethod();
Annotation[][] parameterAnnotations = method.getParameterAnnotations();
Type[] parameterTypes = endpointMethod.getParameterTypes();
if (parameterAnnotations.length != parameterTypes.length) {
throw new IllegalArgumentException();
}
for (int i = 0; i < parameterAnnotations.length; i++) {
Annotation parameterName =
AnnotationUtil.getNamedParameter(method, i, annotationTypes.get("Named"));
Annotation nullable =
AnnotationUtil.getNullableParameter(method, i, annotationTypes.get("Nullable"));
Annotation defaultValue =
AnnotationUtil.getParameterAnnotation(method, i, annotationTypes.get("DefaultValue"));
readMethodRequestParameter(methodConfig, parameterName, nullable, defaultValue,
parameterTypes[i]);
}
}
private void readMethodRequestParameter(ApiMethodConfig methodConfig, Annotation parameterName,
Annotation nullable, Annotation defaultValue, Type type) throws IllegalArgumentException,
SecurityException, IllegalAccessException, InvocationTargetException,
NoSuchMethodException {
String parameterNameString = null;
if (parameterName != null) {
parameterNameString = getAnnotationProperty(parameterName, "value");
}
String defaultValueString = null;
if (defaultValue != null) {
defaultValueString = getAnnotationProperty(defaultValue, "value");
}
ApiParameterConfig parameterConfig =
methodConfig.addParameter(parameterNameString, nullable != null, defaultValueString, type);
if (type instanceof Class) {
Class clazz = (Class) type;
Annotation apiSerializer = clazz.getAnnotation(annotationTypes.get("ApiTransformer"));
if (apiSerializer != null) {
Class> serializer =
getAnnotationProperty(apiSerializer, "value");
parameterConfig.setSerializer(serializer);
}
}
if (parameterConfig.isRepeated()) {
Type repeatedItemType = parameterConfig.getRepeatedItemType();
if (repeatedItemType instanceof Class) {
Class clazz = (Class) repeatedItemType;
Annotation apiSerializer = clazz.getAnnotation(annotationTypes.get("ApiTransformer"));
if (apiSerializer != null) {
Class> repeatedItemSerializer =
getAnnotationProperty(apiSerializer, "value");
parameterConfig.setRepeatedItemSerializer(repeatedItemSerializer);
}
}
}
}
private static A getDeclaredAnnotation(
Class clazz, Class annotationClass) {
for (Annotation annotation : clazz.getDeclaredAnnotations()) {
if (annotation.annotationType().equals(annotationClass)) {
return annotationClass.cast(annotation);
}
}
return null;
}
}
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