001package ca.uhn.fhir.rest.client.method;
002
003/*
004 * #%L
005 * HAPI FHIR - Client Framework
006 * %%
007 * Copyright (C) 2014 - 2021 Smile CDR, Inc.
008 * %%
009 * Licensed under the Apache License, Version 2.0 (the "License");
010 * you may not use this file except in compliance with the License.
011 * You may obtain a copy of the License at
012 *
013 * http://www.apache.org/licenses/LICENSE-2.0
014 *
015 * Unless required by applicable law or agreed to in writing, software
016 * distributed under the License is distributed on an "AS IS" BASIS,
017 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
018 * See the License for the specific language governing permissions and
019 * limitations under the License.
020 * #L%
021 */
022
023import ca.uhn.fhir.context.ConfigurationException;
024import ca.uhn.fhir.context.FhirContext;
025import ca.uhn.fhir.model.api.annotation.Description;
026import ca.uhn.fhir.model.valueset.BundleTypeEnum;
027import ca.uhn.fhir.rest.annotation.Operation;
028import ca.uhn.fhir.rest.api.RestOperationTypeEnum;
029import ca.uhn.fhir.rest.client.impl.BaseHttpClientInvocation;
030import ca.uhn.fhir.rest.param.ParameterUtil;
031import ca.uhn.fhir.rest.server.exceptions.InternalErrorException;
032import ca.uhn.fhir.util.FhirTerser;
033import ca.uhn.fhir.util.ParametersUtil;
034import org.hl7.fhir.instance.model.api.*;
035
036import java.lang.reflect.Method;
037import java.lang.reflect.Modifier;
038import java.util.ArrayList;
039import java.util.LinkedHashMap;
040import java.util.List;
041import java.util.Map;
042
043import static org.apache.commons.lang3.StringUtils.isBlank;
044import static org.apache.commons.lang3.StringUtils.isNotBlank;
045
046public class OperationMethodBinding extends BaseResourceReturningMethodBinding {
047
048        private static final org.slf4j.Logger ourLog = org.slf4j.LoggerFactory.getLogger(OperationMethodBinding.class);
049        private final boolean myIdempotent;
050        private final Integer myIdParamIndex;
051        private final String myName;
052        private final RestOperationTypeEnum myOtherOperationType;
053        private final ReturnTypeEnum myReturnType;
054        private BundleTypeEnum myBundleType;
055        private String myDescription;
056
057        protected OperationMethodBinding(Class<?> theReturnResourceType, Class<? extends IBaseResource> theReturnTypeFromRp, Method theMethod, FhirContext theContext, Object theProvider,
058                                                                                                boolean theIdempotent, String theOperationName, Class<? extends IBaseResource> theOperationType,
059                                                                                                BundleTypeEnum theBundleType) {
060                super(theReturnResourceType, theMethod, theContext, theProvider);
061
062                myBundleType = theBundleType;
063                myIdempotent = theIdempotent;
064                myIdParamIndex = ParameterUtil.findIdParameterIndex(theMethod, getContext());
065
066                Description description = theMethod.getAnnotation(Description.class);
067                if (description != null) {
068                        myDescription = ParametersUtil.extractDescription(description);
069                }
070                if (isBlank(myDescription)) {
071                        myDescription = null;
072                }
073
074                if (isBlank(theOperationName)) {
075                        throw new ConfigurationException("Method '" + theMethod.getName() + "' on type " + theMethod.getDeclaringClass().getName() + " is annotated with @" + Operation.class.getSimpleName()
076                                + " but this annotation has no name defined");
077                }
078                if (theOperationName.startsWith("$") == false) {
079                        theOperationName = "$" + theOperationName;
080                }
081                myName = theOperationName;
082
083                if (theReturnTypeFromRp != null) {
084                        setResourceName(theContext.getResourceType(theReturnTypeFromRp));
085                } else {
086                        if (Modifier.isAbstract(theOperationType.getModifiers()) == false) {
087                                setResourceName(theContext.getResourceType(theOperationType));
088                        } else {
089                                setResourceName(null);
090                        }
091                }
092
093                myReturnType = ReturnTypeEnum.RESOURCE;
094
095                if (getResourceName() == null) {
096                        myOtherOperationType = RestOperationTypeEnum.EXTENDED_OPERATION_SERVER;
097                } else if (myIdParamIndex == null) {
098                        myOtherOperationType = RestOperationTypeEnum.EXTENDED_OPERATION_TYPE;
099                } else {
100                        myOtherOperationType = RestOperationTypeEnum.EXTENDED_OPERATION_INSTANCE;
101                }
102
103        }
104
105        public OperationMethodBinding(Class<?> theReturnResourceType, Class<? extends IBaseResource> theReturnTypeFromRp, Method theMethod, FhirContext theContext, Object theProvider,
106                                                                                        Operation theAnnotation) {
107                this(theReturnResourceType, theReturnTypeFromRp, theMethod, theContext, theProvider, theAnnotation.idempotent(), theAnnotation.name(), theAnnotation.type(), theAnnotation.bundleType());
108        }
109
110        public String getDescription() {
111                return myDescription;
112        }
113
114        public void setDescription(String theDescription) {
115                myDescription = theDescription;
116        }
117
118        /**
119         * Returns the name of the operation, starting with "$"
120         */
121        public String getName() {
122                return myName;
123        }
124
125        @Override
126        protected BundleTypeEnum getResponseBundleType() {
127                return myBundleType;
128        }
129
130        @Override
131        public RestOperationTypeEnum getRestOperationType() {
132                return myOtherOperationType;
133        }
134
135        @Override
136        public ReturnTypeEnum getReturnType() {
137                return myReturnType;
138        }
139
140        @Override
141        public BaseHttpClientInvocation invokeClient(Object[] theArgs) throws InternalErrorException {
142                String id = null;
143                if (myIdParamIndex != null) {
144                        IIdType idDt = (IIdType) theArgs[myIdParamIndex];
145                        id = idDt.getValue();
146                }
147                IBaseParameters parameters = (IBaseParameters) getContext().getResourceDefinition("Parameters").newInstance();
148
149                if (theArgs != null) {
150                        for (int idx = 0; idx < theArgs.length; idx++) {
151                                IParameter nextParam = getParameters().get(idx);
152                                nextParam.translateClientArgumentIntoQueryArgument(getContext(), theArgs[idx], null, parameters);
153                        }
154                }
155
156                return createOperationInvocation(getContext(), getResourceName(), id, null, myName, parameters, false);
157        }
158
159        public boolean isIdempotent() {
160                return myIdempotent;
161        }
162
163        public static BaseHttpClientInvocation createOperationInvocation(FhirContext theContext, String theResourceName, String theId, String theVersion, String theOperationName, IBaseParameters theInput,
164                                                                                                                                                                                  boolean theUseHttpGet) {
165                StringBuilder b = new StringBuilder();
166                if (theResourceName != null) {
167                        b.append(theResourceName);
168                        if (isNotBlank(theId)) {
169                                b.append('/');
170                                b.append(theId);
171                                if (isNotBlank(theVersion)) {
172                                        b.append("/_history/");
173                                        b.append(theVersion);
174                                }
175                        }
176                }
177                if (b.length() > 0) {
178                        b.append('/');
179                }
180                if (!theOperationName.startsWith("$")) {
181                        b.append("$");
182                }
183                b.append(theOperationName);
184
185                if (!theUseHttpGet) {
186                        return new HttpPostClientInvocation(theContext, theInput, b.toString());
187                }
188                FhirTerser t = theContext.newTerser();
189                List<IBase> parameters = t.getValues(theInput, "Parameters.parameter");
190
191                Map<String, List<String>> params = new LinkedHashMap<>();
192                for (Object nextParameter : parameters) {
193                        IPrimitiveType<?> nextNameDt = (IPrimitiveType<?>) t.getSingleValueOrNull((IBase) nextParameter, "name");
194                        if (nextNameDt == null || nextNameDt.isEmpty()) {
195                                ourLog.warn("Ignoring input parameter with no value in Parameters.parameter.name in operation client invocation");
196                                continue;
197                        }
198                        String nextName = nextNameDt.getValueAsString();
199                        if (!params.containsKey(nextName)) {
200                                params.put(nextName, new ArrayList<>());
201                        }
202
203                        IBaseDatatype value = (IBaseDatatype) t.getSingleValueOrNull((IBase) nextParameter, "value[x]");
204                        if (value == null) {
205                                continue;
206                        }
207                        if (!(value instanceof IPrimitiveType)) {
208                                throw new IllegalArgumentException(
209                                        "Can not invoke operation as HTTP GET when it has parameters with a composite (non priitive) datatype as the value. Found value: " + value.getClass().getName());
210                        }
211                        IPrimitiveType<?> primitive = (IPrimitiveType<?>) value;
212                        params.get(nextName).add(primitive.getValueAsString());
213                }
214                return new HttpGetClientInvocation(theContext, params, b.toString());
215        }
216
217        public static BaseHttpClientInvocation createProcessMsgInvocation(FhirContext theContext, String theOperationName, IBaseBundle theInput, Map<String, List<String>> urlParams) {
218                StringBuilder b = new StringBuilder();
219
220                if (b.length() > 0) {
221                        b.append('/');
222                }
223                if (!theOperationName.startsWith("$")) {
224                        b.append("$");
225                }
226                b.append(theOperationName);
227
228                BaseHttpClientInvocation.appendExtraParamsWithQuestionMark(urlParams, b, b.indexOf("?") == -1);
229
230                return new HttpPostClientInvocation(theContext, theInput, b.toString());
231
232        }
233
234}