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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.model;
import com.google.api.server.spi.Constant;
import com.google.api.server.spi.EndpointMethod;
import com.google.api.server.spi.TypeLoader;
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.model.ApiParameterConfig.Classification;
import com.google.api.server.spi.config.scope.AuthScopeExpression;
import com.google.common.base.Preconditions;
import com.google.common.reflect.TypeToken;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Flattened method configuration for a swarm endpoint method. Data generally originates from
* {@link com.google.api.server.spi.config.ApiMethod} annotations.
*
* @author Eric Orth
*/
public class ApiMethodConfig {
private enum RestMethod {
LIST("list", "GET") {
@Override
public String guessResourceName(
ApiConfig config, EndpointMethod method, Map> classTypes) {
Type returnType = method.getReturnType();
if (isValidCollectionType(returnType, classTypes)) {
Type[] typeArgs = ((ParameterizedType) returnType).getActualTypeArguments();
Type resourceType = typeArgs.length > 0 ? typeArgs[0] : null;
return config.getSimpleName(resourceType).toLowerCase();
}
return null;
}
private boolean isValidCollectionType(Type type, Map> classTypes) {
if (type instanceof ParameterizedType) {
Class collectionClass = TypeToken.of(type).getRawType();
return classTypes.get("Collection").isAssignableFrom(collectionClass) ||
classTypes.get("CollectionResponses").isAssignableFrom(collectionClass);
}
return false;
}
},
GET("get", "GET"),
INSERT("insert", "POST"),
UPDATE("update", "PUT"),
DELETE("delete", "DELETE") {
@Override
public String guessResourceName(
ApiConfig config, EndpointMethod method, Map> classTypes) {
String methodName = method.getMethod().getName();
return methodNamePrefix.length() >= methodName.length() ? null :
methodName.substring(methodNamePrefix.length()).toLowerCase();
}
},
REMOVE("remove", "DELETE") {
@Override
public String guessResourceName(
ApiConfig config, EndpointMethod method, Map> classTypes) {
String methodName = method.getMethod().getName();
return methodNamePrefix.length() >= methodName.length() ? null :
methodName.substring(methodNamePrefix.length()).toLowerCase();
}
},
DEFAULT("", "POST") {
@Override
public String guessResourceName(
ApiConfig config, EndpointMethod method, Map> classTypes) {
return null;
}
};
protected final String methodNamePrefix;
private final String httpMethod;
/**
* Specifies a default REST method prefix, as well as what HTTP method it should use by default.
*
* @param methodNamePrefix A method name prefix.
* @param httpMethod The default HTTP method for this prefix.
*/
RestMethod(String methodNamePrefix, String httpMethod) {
this.methodNamePrefix = methodNamePrefix;
this.httpMethod = httpMethod;
}
/**
* Gets the method name prefix for this instance.
*
* @return The method name prefix.
*/
public String getMethodNamePrefix() {
return this.methodNamePrefix;
}
/**
* Gets the default HTTP method for this instance.
*
* @return The HTTP method.
*/
public String getHttpMethod() {
return this.httpMethod;
}
/**
* Guesses a resource name based off a prefix.
*
* @return The HTTP method.
*/
public String guessResourceName(
ApiConfig config, EndpointMethod method, Map> classTypes) {
return config.getSimpleName(method.getReturnType()).toLowerCase();
}
}
private final String endpointMethodName;
private final List parameterConfigs;
private final ApiClassConfig apiClassConfig;
private String name;
private String path;
private String httpMethod;
// If null, get a default from apiConfig.
// TODO: When splitting out a builder class, pull in actual default on build().
private AuthLevel authLevel;
private AuthScopeExpression scopeExpression;
private List audiences;
private ApiIssuerAudienceConfig issuerAudiences;
private List clientIds;
private List> authenticators;
private List> peerAuthenticators;
private boolean ignored = false;
private final TypeLoader typeLoader;
public ApiMethodConfig(EndpointMethod method, TypeLoader typeLoader,
ApiClassConfig apiClassConfig) {
this.endpointMethodName = method.getMethod().getName();
this.parameterConfigs = new ArrayList<>();
this.apiClassConfig = apiClassConfig;
this.typeLoader = typeLoader;
setDefaults(method, typeLoader, apiClassConfig.getResource());
}
public ApiMethodConfig(ApiMethodConfig original, ApiClassConfig apiClassConfig) {
this.endpointMethodName = original.endpointMethodName;
this.apiClassConfig = apiClassConfig;
this.name = original.name;
this.path = original.path;
this.httpMethod = original.httpMethod;
this.scopeExpression = original.scopeExpression;
this.audiences = original.audiences == null ? null : new ArrayList<>(original.audiences);
this.issuerAudiences = original.issuerAudiences;
this.clientIds = original.clientIds == null ? null : new ArrayList<>(original.clientIds);
this.authenticators =
original.authenticators == null ? null : new ArrayList<>(original.authenticators);
this.peerAuthenticators =
original.peerAuthenticators == null ? null : new ArrayList<>(original.peerAuthenticators);
this.ignored = original.ignored;
this.typeLoader = original.typeLoader;
// Parameter configs are mutable, so we need to do a deep copy.
this.parameterConfigs = new ArrayList<>(original.parameterConfigs.size());
for (ApiParameterConfig parameter : original.parameterConfigs) {
parameterConfigs.add(new ApiParameterConfig(parameter, this));
}
}
/**
* Sets all fields to their default value to be used if not set otherwise. Override to change the
* default configuration.
*/
protected void setDefaults(EndpointMethod endpointMethod, TypeLoader typeLoader,
String apiDefaultResource) {
Method method = endpointMethod.getMethod();
RestMethod restMethod = getRestMethod(method);
String resourceTypeName;
if (apiDefaultResource != null) {
resourceTypeName = apiDefaultResource.toLowerCase();
} else {
resourceTypeName = restMethod.guessResourceName(
apiClassConfig.getApiConfig(), endpointMethod, typeLoader.getClassTypes());
}
name = null;
httpMethod = Preconditions.checkNotNull(restMethod.getHttpMethod(), "httpMethod");
path = Preconditions.checkNotNull(
resourceTypeName == null ? method.getName() : resourceTypeName.toLowerCase(), "path");
authLevel = AuthLevel.UNSPECIFIED;
scopeExpression = null;
audiences = null;
issuerAudiences = ApiIssuerAudienceConfig.UNSPECIFIED;
clientIds = null;
authenticators = null;
peerAuthenticators = null;
ignored = false;
}
private RestMethod getRestMethod(Method method) {
String methodName = method.getName();
for (RestMethod entry : RestMethod.values()) {
if (methodName.startsWith(entry.getMethodNamePrefix())) {
return entry;
}
}
throw new AssertionError("It's impossible for method" + method + " to map to no REST path.");
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
} else if (o instanceof ApiMethodConfig) {
ApiMethodConfig config = (ApiMethodConfig) o;
return Objects.equals(endpointMethodName, config.endpointMethodName) &&
parameterConfigs.equals(config.parameterConfigs) && Objects.equals(name, config.name) &&
Objects.equals(path, config.path) && Objects.equals(httpMethod, config.httpMethod) &&
Objects.equals(scopeExpression, config.scopeExpression) &&
Objects.equals(audiences, config.audiences) &&
Objects.equals(issuerAudiences, config.issuerAudiences) &&
Objects.equals(clientIds, config.clientIds) &&
Objects.equals(authenticators, config.authenticators) &&
Objects.equals(peerAuthenticators, config.peerAuthenticators) &&
Objects.equals(typeLoader, config.typeLoader) &&
ignored == config.ignored;
} else {
return false;
}
}
@Override
public int hashCode() {
return Objects.hash(endpointMethodName, parameterConfigs, name, path, httpMethod,
scopeExpression, audiences, clientIds, authenticators, peerAuthenticators, typeLoader,
ignored, issuerAudiences);
}
public ApiClassConfig getApiClassConfig() {
return apiClassConfig;
}
public String getEndpointMethodName() {
return endpointMethodName;
}
/**
* Generates, using class name and java method name, a dot-separated full name for this endpoint
* method. This is different from the method name from {@code getFullMethodName}, which is used
* to uniquely identify the method within the context of the API. The java method name, however,
* is used to identify and reflectively call the actual java method.
*/
public String getFullJavaName() {
return apiClassConfig.getApiClassJavaName() + "." + getEndpointMethodName();
}
/**
* Adds the given parameter to the configuration and updates the path to add the new parameter if
* it is non-optional and has no default.
*/
public ApiParameterConfig addParameter(String name, boolean nullable, String defaultValue,
Type type) {
ApiParameterConfig config =
new ApiParameterConfig(this, name, nullable, defaultValue, type, typeLoader);
parameterConfigs.add(config);
if (config.getClassification() != Classification.INJECTED && name != null && !nullable
&& defaultValue == null) {
path += "/{" + name + "}";
}
return config;
}
public List getParameterConfigs() {
return parameterConfigs;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
if (name != null) {
return name;
} else if (apiClassConfig.getResource() != null) {
return String.format("%s.%s", apiClassConfig.getResource(), endpointMethodName);
} else {
if (apiClassConfig.getApiClassJavaSimpleName().isEmpty()) {
return String.format("%s", endpointMethodName);
} else {
return String.format(
"%s.%s", apiClassConfig.getApiClassJavaSimpleName(), endpointMethodName);
}
}
}
/*
* Parts in dot delimited external method names such as JSON-RPC method names
* must be camel-cased alpha-numeric.
* [a-z][a-zA-Z0-9]*
*/
public static String methodNameFormatter(String methodName) {
StringBuilder builder = new StringBuilder();
for (String s : methodName.split("\\.")) {
if (!s.isEmpty()) {
builder.append(Character.toLowerCase(s.charAt(0))).append(s.substring(1)).append('.');
}
}
if (builder.length() == 0) {
return builder.toString();
} else {
return builder.deleteCharAt(builder.length() - 1).toString();
}
}
/**
* Generates, using API name and method name, a dot-separated full name for this endpoint method.
* The name is sanitized by {@code methodNameFormatter}.
*/
public String getFullMethodName() {
return methodNameFormatter(apiClassConfig.getApiConfig().getName() + "." + getName());
}
public void setPath(String path) {
this.path = path;
}
public String getPath() {
return path;
}
public void setHttpMethod(String httpMethod) {
this.httpMethod = httpMethod;
}
public String getHttpMethod() {
return httpMethod;
}
/**
* Generates a string representing the signature of the method when called using REST. Can be
* used to determine ambiguity of such REST calls.
*
* For example, a method with path "getFoo/{idA}/bar/{idB}" using http method GET would generate
* the rest path "GET getFoo/{}/bar/{}".
*/
public String getRestfulSignature() {
return getHttpMethod() + " " + getPath().replaceAll("\\{([^\\}]*)\\}", "\\{\\}");
}
public void setAuthLevel(AuthLevel authLevel) {
this.authLevel = authLevel;
}
public AuthLevel getAuthLevel() {
return authLevel != AuthLevel.UNSPECIFIED ? authLevel : apiClassConfig.getAuthLevel();
}
public void setScopeExpression(AuthScopeExpression scopeExpression) {
this.scopeExpression = scopeExpression;
}
public AuthScopeExpression getScopeExpression() {
return scopeExpression != null ? scopeExpression : apiClassConfig.getScopeExpression();
}
public void setAudiences(List audiences) {
this.audiences = audiences;
}
public List getAudiences() {
return audiences != null ? audiences : apiClassConfig.getAudiences();
}
public void setIssuerAudiences(ApiIssuerAudienceConfig issuerAudiences) {
Preconditions.checkNotNull(issuerAudiences, "issuerAudiences should never be null");
this.issuerAudiences = issuerAudiences;
if (issuerAudiences.hasIssuer(Constant.GOOGLE_ID_TOKEN_NAME)) {
getApiClassConfig().getApiConfig().ensureGoogleIssuer();
}
}
public ApiIssuerAudienceConfig getIssuerAudiences() {
return issuerAudiences.isSpecified() ? issuerAudiences : apiClassConfig.getIssuerAudiences();
}
public void setClientIds(List clientIds) {
this.clientIds = clientIds;
}
public List getClientIds() {
return clientIds != null ? clientIds : apiClassConfig.getClientIds();
}
public void setAuthenticators(List> authenticators) {
this.authenticators = authenticators;
}
public List> getAuthenticators() {
return authenticators != null ? authenticators : apiClassConfig.getAuthenticators();
}
public void setPeerAuthenticators(List> peerAuthenticators) {
this.peerAuthenticators = peerAuthenticators;
}
public List> getPeerAuthenticators() {
return peerAuthenticators != null ? peerAuthenticators : apiClassConfig.getPeerAuthenticators();
}
public void setIgnored(boolean ignored) {
this.ignored = ignored;
}
public boolean isIgnored() {
return ignored;
}
/**
* Gets parameters in current path.
*/
public Collection getPathParameters() {
Pattern pathPattern = java.util.regex.Pattern.compile("\\{([^\\}]*)\\}");
Matcher pathMatcher = pathPattern.matcher(path);
Collection pathParameters = new HashSet<>();
while (pathMatcher.find()) {
pathParameters.add(pathMatcher.group(1));
}
return pathParameters;
}
}
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