
001/*- 002 * #%L 003 * HAPI FHIR - Client Framework 004 * %% 005 * Copyright (C) 2014 - 2023 Smile CDR, Inc. 006 * %% 007 * Licensed under the Apache License, Version 2.0 (the "License"); 008 * you may not use this file except in compliance with the License. 009 * You may obtain a copy of the License at 010 * 011 * http://www.apache.org/licenses/LICENSE-2.0 012 * 013 * Unless required by applicable law or agreed to in writing, software 014 * distributed under the License is distributed on an "AS IS" BASIS, 015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 016 * See the License for the specific language governing permissions and 017 * limitations under the License. 018 * #L% 019 */ 020package ca.uhn.fhir.rest.client.apache; 021 022import java.util.List; 023import java.util.Map; 024 025import org.hl7.fhir.instance.model.api.IBaseBinary; 026 027import ca.uhn.fhir.context.FhirContext; 028import ca.uhn.fhir.rest.api.*; 029import ca.uhn.fhir.rest.client.api.Header; 030import ca.uhn.fhir.rest.client.api.HttpClientUtil; 031import ca.uhn.fhir.rest.client.api.IHttpClient; 032import ca.uhn.fhir.rest.client.api.IHttpRequest; 033import ca.uhn.fhir.rest.client.impl.BaseHttpClientInvocation; 034import ca.uhn.fhir.rest.client.method.MethodUtil; 035 036public abstract class BaseHttpClient implements IHttpClient { 037 038 private final List<Header> myHeaders; 039 private final Map<String, List<String>> myIfNoneExistParams; 040 private final String myIfNoneExistString; 041 protected final RequestTypeEnum myRequestType; 042 protected final StringBuilder myUrl; 043 044 /** 045 * Constructor 046 */ 047 public BaseHttpClient(StringBuilder theUrl, Map<String, List<String>> theIfNoneExistParams, String theIfNoneExistString, RequestTypeEnum theRequestType, List<Header> theHeaders) { 048 this.myUrl = theUrl; 049 this.myIfNoneExistParams = theIfNoneExistParams; 050 this.myIfNoneExistString = theIfNoneExistString; 051 this.myRequestType = theRequestType; 052 this.myHeaders = theHeaders; 053 } 054 055 private void addHeaderIfNoneExist(IHttpRequest result) { 056 if (myIfNoneExistParams != null) { 057 StringBuilder b = newHeaderBuilder(myUrl); 058 BaseHttpClientInvocation.appendExtraParamsWithQuestionMark(myIfNoneExistParams, b, b.indexOf("?") == -1); 059 result.addHeader(Constants.HEADER_IF_NONE_EXIST, b.toString()); 060 } 061 062 if (myIfNoneExistString != null) { 063 StringBuilder b = newHeaderBuilder(myUrl); 064 b.append(b.indexOf("?") == -1 ? '?' : '&'); 065 b.append(myIfNoneExistString.substring(myIfNoneExistString.indexOf('?') + 1)); 066 result.addHeader(Constants.HEADER_IF_NONE_EXIST, b.toString()); 067 } 068 } 069 070 public void addHeadersToRequest(IHttpRequest theHttpRequest, EncodingEnum theEncoding, FhirContext theContext) { 071 if (myHeaders != null) { 072 for (Header next : myHeaders) { 073 theHttpRequest.addHeader(next.getName(), next.getValue()); 074 } 075 } 076 077 theHttpRequest.addHeader("User-Agent", HttpClientUtil.createUserAgentString(theContext, "apache")); 078 theHttpRequest.addHeader("Accept-Charset", "utf-8"); 079 theHttpRequest.addHeader("Accept-Encoding", "gzip"); 080 081 addHeaderIfNoneExist(theHttpRequest); 082 083 MethodUtil.addAcceptHeaderToRequest(theEncoding, theHttpRequest, theContext); 084 } 085 086 @Override 087 public IHttpRequest createBinaryRequest(FhirContext theContext, IBaseBinary theBinary) { 088 byte[] content = theBinary.getContent(); 089 IHttpRequest retVal = createHttpRequest(content); 090 addHeadersToRequest(retVal, null, theContext); 091 retVal.addHeader(Constants.HEADER_CONTENT_TYPE, theBinary.getContentType()); 092 return retVal; 093 } 094 095 @Override 096 public IHttpRequest createByteRequest(FhirContext theContext, String theContents, String theContentType, EncodingEnum theEncoding) { 097 IHttpRequest retVal = createHttpRequest(theContents); 098 addHeadersToRequest(retVal, theEncoding, theContext); 099 retVal.addHeader(Constants.HEADER_CONTENT_TYPE, theContentType + Constants.HEADER_SUFFIX_CT_UTF_8); 100 return retVal; 101 } 102 103 @Override 104 public IHttpRequest createGetRequest(FhirContext theContext, EncodingEnum theEncoding) { 105 IHttpRequest retVal = createHttpRequest(); 106 addHeadersToRequest(retVal, theEncoding, theContext); 107 return retVal; 108 } 109 110 protected abstract IHttpRequest createHttpRequest(); 111 112 protected abstract IHttpRequest createHttpRequest(byte[] theContent); 113 114 protected abstract IHttpRequest createHttpRequest(Map<String, List<String>> theParams); 115 116 protected abstract IHttpRequest createHttpRequest(String theContents); 117 118 @Override 119 public IHttpRequest createParamRequest(FhirContext theContext, Map<String, List<String>> theParams, EncodingEnum theEncoding) { 120 IHttpRequest retVal = createHttpRequest(theParams); 121 addHeadersToRequest(retVal, theEncoding, theContext); 122 return retVal; 123 } 124 125 private StringBuilder newHeaderBuilder(StringBuilder theUrlBase) { 126 StringBuilder b = new StringBuilder(); 127 b.append(theUrlBase); 128 if (theUrlBase.length() > 0 && theUrlBase.charAt(theUrlBase.length() - 1) == '/') { 129 b.deleteCharAt(b.length() - 1); 130 } 131 return b; 132 } 133}