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Java.libraries.feign.ApiClient.mustache Maven / Gradle / Ivy
package {{invokerPackage}};
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
{{#threetenbp}}
import org.threeten.bp.*;
{{/threetenbp}}
import feign.okhttp.OkHttpClient;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
{{#openApiNullable}}
import org.openapitools.jackson.nullable.JsonNullableModule;
{{/openApiNullable}}
{{#joda}}
import com.fasterxml.jackson.datatype.joda.JodaModule;
{{/joda}}
{{#java8}}
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
{{/java8}}
{{#threetenbp}}
import com.fasterxml.jackson.datatype.threetenbp.ThreeTenModule;
{{/threetenbp}}
import feign.Feign;
import feign.RequestInterceptor;
import feign.form.FormEncoder;
import feign.jackson.JacksonDecoder;
import feign.jackson.JacksonEncoder;
import feign.slf4j.Slf4jLogger;
import {{invokerPackage}}.auth.*;
{{#hasOAuthMethods}}
import {{invokerPackage}}.auth.OAuth.AccessTokenListener;
{{/hasOAuthMethods}}
{{>generatedAnnotation}}
public class ApiClient {
private static final Logger log = Logger.getLogger(ApiClient.class.getName());
public interface Api {}
protected ObjectMapper objectMapper;
private String basePath = "{{{basePath}}}";
private Map apiAuthorizations;
private Feign.Builder feignBuilder;
public ApiClient() {
objectMapper = createObjectMapper();
apiAuthorizations = new LinkedHashMap();
feignBuilder = Feign.builder()
.client(new OkHttpClient())
.encoder(new FormEncoder(new JacksonEncoder(objectMapper)))
.decoder(new JacksonDecoder(objectMapper))
.logger(new Slf4jLogger());
}
public ApiClient(String[] authNames) {
this();
for(String authName : authNames) {
log.log(Level.FINE, "Creating authentication {0}", authName);
{{#hasAuthMethods}}
RequestInterceptor auth;
{{#authMethods}}if ("{{name}}".equals(authName)) {
{{#isBasic}}
{{#isBasicBasic}}
auth = new HttpBasicAuth();
{{/isBasicBasic}}
{{^isBasicBasic}}
auth = new HttpBearerAuth("{{scheme}}");
{{/isBasicBasic}}
{{/isBasic}}
{{#isApiKey}}
auth = new ApiKeyAuth({{#isKeyInHeader}}"header"{{/isKeyInHeader}}{{#isKeyInQuery}}"query"{{/isKeyInQuery}}{{#isKeyInCookie}}"cookie"{{/isKeyInCookie}}, "{{keyParamName}}");
{{/isApiKey}}
{{#isOAuth}}
auth = buildOauthRequestInterceptor(OAuthFlow.{{flow}}, "{{authorizationUrl}}", "{{tokenUrl}}", "{{#scopes}}{{scope}}{{^-last}}, {{/-last}}{{/scopes}}");
{{/isOAuth}}
} else {{/authMethods}}{
throw new RuntimeException("auth name \"" + authName + "\" not found in available auth names");
}
addAuthorization(authName, auth);
{{/hasAuthMethods}}
{{^hasAuthMethods}}
throw new RuntimeException("auth name \"" + authName + "\" not found in available auth names");
{{/hasAuthMethods}}
}
}
/**
* Basic constructor for single auth name
* @param authName
*/
public ApiClient(String authName) {
this(new String[]{authName});
}
/**
* Helper constructor for single api key
* @param authName
* @param apiKey
*/
public ApiClient(String authName, String apiKey) {
this(authName);
this.setApiKey(apiKey);
}
public String getBasePath() {
return basePath;
}
public ApiClient setBasePath(String basePath) {
this.basePath = basePath;
return this;
}
public Map getApiAuthorizations() {
return apiAuthorizations;
}
public void setApiAuthorizations(Map apiAuthorizations) {
this.apiAuthorizations = apiAuthorizations;
}
public Feign.Builder getFeignBuilder() {
return feignBuilder;
}
public ApiClient setFeignBuilder(Feign.Builder feignBuilder) {
this.feignBuilder = feignBuilder;
return this;
}
private ObjectMapper createObjectMapper() {
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.enable(SerializationFeature.WRITE_ENUMS_USING_TO_STRING);
objectMapper.enable(DeserializationFeature.READ_ENUMS_USING_TO_STRING);
objectMapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
objectMapper.disable(DeserializationFeature.FAIL_ON_INVALID_SUBTYPE);
objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
objectMapper.setDateFormat(new RFC3339DateFormat());
{{#joda}}
objectMapper.registerModule(new JodaModule());
{{/joda}}
{{#java8}}
objectMapper.registerModule(new JavaTimeModule());
{{/java8}}
{{#threetenbp}}
ThreeTenModule module = new ThreeTenModule();
module.addDeserializer(Instant.class, CustomInstantDeserializer.INSTANT);
module.addDeserializer(OffsetDateTime.class, CustomInstantDeserializer.OFFSET_DATE_TIME);
module.addDeserializer(ZonedDateTime.class, CustomInstantDeserializer.ZONED_DATE_TIME);
objectMapper.registerModule(module);
{{/threetenbp}}
{{#openApiNullable}}
JsonNullableModule jnm = new JsonNullableModule();
objectMapper.registerModule(jnm);
{{/openApiNullable}}
return objectMapper;
}
private RequestInterceptor buildOauthRequestInterceptor(OAuthFlow flow, String authorizationUrl, String tokenUrl, String scopes) {
switch (flow) {
case password:
return new OauthPasswordGrant(tokenUrl, scopes);
case application:
return new OauthClientCredentialsGrant(authorizationUrl, tokenUrl, scopes);
default:
throw new RuntimeException("Oauth flow \"" + flow + "\" is not implemented");
}
}
public ObjectMapper getObjectMapper(){
return objectMapper;
}
public void setObjectMapper(ObjectMapper objectMapper) {
this.objectMapper = objectMapper;
}
/**
* Creates a feign client for given API interface.
*
* Usage:
* ApiClient apiClient = new ApiClient();
* apiClient.setBasePath("http://localhost:8080");
* XYZApi api = apiClient.buildClient(XYZApi.class);
* XYZResponse response = api.someMethod(...);
* @param Type
* @param clientClass Client class
* @return The Client
*/
public T buildClient(Class clientClass) {
return feignBuilder.target(clientClass, basePath);
}
/**
* Select the Accept header's value from the given accepts array:
* if JSON exists in the given array, use it;
* otherwise use all of them (joining into a string)
*
* @param accepts The accepts array to select from
* @return The Accept header to use. If the given array is empty,
* null will be returned (not to set the Accept header explicitly).
*/
public String selectHeaderAccept(String[] accepts) {
if (accepts.length == 0) return null;
if (StringUtil.containsIgnoreCase(accepts, "application/json")) return "application/json";
return StringUtil.join(accepts, ",");
}
/**
* Select the Content-Type header's value from the given array:
* if JSON exists in the given array, use it;
* otherwise use the first one of the array.
*
* @param contentTypes The Content-Type array to select from
* @return The Content-Type header to use. If the given array is empty,
* JSON will be used.
*/
public String selectHeaderContentType(String[] contentTypes) {
if (contentTypes.length == 0) return "application/json";
if (StringUtil.containsIgnoreCase(contentTypes, "application/json")) return "application/json";
return contentTypes[0];
}
/**
* Helper method to configure the bearer token.
* @param bearerToken the bearer token.
*/
public void setBearerToken(String bearerToken) {
HttpBearerAuth apiAuthorization = getAuthorization(HttpBearerAuth.class);
apiAuthorization.setBearerToken(bearerToken);
}
/**
* Helper method to configure the first api key found
* @param apiKey API key
*/
public void setApiKey(String apiKey) {
ApiKeyAuth apiAuthorization = getAuthorization(ApiKeyAuth.class);
apiAuthorization.setApiKey(apiKey);
}
/**
* Helper method to configure the username/password for basic auth
* @param username Username
* @param password Password
*/
public void setCredentials(String username, String password) {
HttpBasicAuth apiAuthorization = getAuthorization(HttpBasicAuth.class);
apiAuthorization.setCredentials(username, password);
}
{{#hasOAuthMethods}}
/**
* Helper method to configure the client credentials for Oauth
* @param username Username
* @param password Password
*/
public void setClientCredentials(String clientId, String clientSecret) {
OauthClientCredentialsGrant authorization = getAuthorization(OauthClientCredentialsGrant.class);
authorization.configure(clientId, clientSecret);
}
/**
* Helper method to configure the username/password for Oauth password grant
* @param username Username
* @param password Password
*/
public void setOauthPassword(String username, String password, String clientId, String clientSecret) {
OauthPasswordGrant apiAuthorization = getAuthorization(OauthPasswordGrant.class);
apiAuthorization.configure(username, password, clientId, clientSecret);
}
/**
* Helper method to pre-set the oauth access token of the first oauth found in the apiAuthorizations (there should be only one)
* @param accessToken Access Token
* @param expiresIn Validity period in seconds
*/
public void setAccessToken(String accessToken, Integer expiresIn) {
OAuth apiAuthorization = getAuthorization(OAuth.class);
apiAuthorization.setAccessToken(accessToken, expiresIn);
}
/**
* Helper method to configure the oauth accessCode/implicit flow parameters
* @param clientId Client ID
* @param clientSecret Client secret
* @param redirectURI Redirect URI
*/
public void configureAuthorizationFlow(String clientId, String clientSecret, String redirectURI) {
throw new RuntimeException("Not implemented");
}
/**
* Configures a listener which is notified when a new access token is received.
* @param accessTokenListener Acesss token listener
*/
public void registerAccessTokenListener(AccessTokenListener accessTokenListener) {
OAuth apiAuthorization = getAuthorization(OAuth.class);
apiAuthorization.registerAccessTokenListener(accessTokenListener);
}
{{/hasOAuthMethods}}
/**
* Gets request interceptor based on authentication name
* @param authName Authentiation name
* @return Request Interceptor
*/
public RequestInterceptor getAuthorization(String authName) {
return apiAuthorizations.get(authName);
}
/**
* Adds an authorization to be used by the client
* @param authName Authentication name
* @param authorization Request interceptor
*/
public void addAuthorization(String authName, RequestInterceptor authorization) {
if (apiAuthorizations.containsKey(authName)) {
throw new RuntimeException("auth name \"" + authName + "\" already in api authorizations");
}
apiAuthorizations.put(authName, authorization);
feignBuilder.requestInterceptor(authorization);
}
private T getAuthorization(Class type) {
return (T) apiAuthorizations.values()
.stream()
.filter(requestInterceptor -> type.isAssignableFrom(requestInterceptor.getClass()))
.findFirst()
.orElseThrow(() -> new RuntimeException("No Oauth authentication or OAuth configured!"));
}
}
