
001package ca.uhn.fhir.rest.client.apache; 002 003/*- 004 * #%L 005 * HAPI FHIR - Client Framework 006 * %% 007 * Copyright (C) 2014 - 2023 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 java.util.List; 024import java.util.Map; 025 026import org.hl7.fhir.instance.model.api.IBaseBinary; 027 028import ca.uhn.fhir.context.FhirContext; 029import ca.uhn.fhir.rest.api.*; 030import ca.uhn.fhir.rest.client.api.Header; 031import ca.uhn.fhir.rest.client.api.HttpClientUtil; 032import ca.uhn.fhir.rest.client.api.IHttpClient; 033import ca.uhn.fhir.rest.client.api.IHttpRequest; 034import ca.uhn.fhir.rest.client.impl.BaseHttpClientInvocation; 035import ca.uhn.fhir.rest.client.method.MethodUtil; 036 037public abstract class BaseHttpClient implements IHttpClient { 038 039 private final List<Header> myHeaders; 040 private final Map<String, List<String>> myIfNoneExistParams; 041 private final String myIfNoneExistString; 042 protected final RequestTypeEnum myRequestType; 043 protected final StringBuilder myUrl; 044 045 /** 046 * Constructor 047 */ 048 public BaseHttpClient(StringBuilder theUrl, Map<String, List<String>> theIfNoneExistParams, String theIfNoneExistString, RequestTypeEnum theRequestType, List<Header> theHeaders) { 049 this.myUrl = theUrl; 050 this.myIfNoneExistParams = theIfNoneExistParams; 051 this.myIfNoneExistString = theIfNoneExistString; 052 this.myRequestType = theRequestType; 053 this.myHeaders = theHeaders; 054 } 055 056 private void addHeaderIfNoneExist(IHttpRequest result) { 057 if (myIfNoneExistParams != null) { 058 StringBuilder b = newHeaderBuilder(myUrl); 059 BaseHttpClientInvocation.appendExtraParamsWithQuestionMark(myIfNoneExistParams, b, b.indexOf("?") == -1); 060 result.addHeader(Constants.HEADER_IF_NONE_EXIST, b.toString()); 061 } 062 063 if (myIfNoneExistString != null) { 064 StringBuilder b = newHeaderBuilder(myUrl); 065 b.append(b.indexOf("?") == -1 ? '?' : '&'); 066 b.append(myIfNoneExistString.substring(myIfNoneExistString.indexOf('?') + 1)); 067 result.addHeader(Constants.HEADER_IF_NONE_EXIST, b.toString()); 068 } 069 } 070 071 public void addHeadersToRequest(IHttpRequest theHttpRequest, EncodingEnum theEncoding, FhirContext theContext) { 072 if (myHeaders != null) { 073 for (Header next : myHeaders) { 074 theHttpRequest.addHeader(next.getName(), next.getValue()); 075 } 076 } 077 078 theHttpRequest.addHeader("User-Agent", HttpClientUtil.createUserAgentString(theContext, "apache")); 079 theHttpRequest.addHeader("Accept-Charset", "utf-8"); 080 theHttpRequest.addHeader("Accept-Encoding", "gzip"); 081 082 addHeaderIfNoneExist(theHttpRequest); 083 084 MethodUtil.addAcceptHeaderToRequest(theEncoding, theHttpRequest, theContext); 085 } 086 087 @Override 088 public IHttpRequest createBinaryRequest(FhirContext theContext, IBaseBinary theBinary) { 089 byte[] content = theBinary.getContent(); 090 IHttpRequest retVal = createHttpRequest(content); 091 addHeadersToRequest(retVal, null, theContext); 092 retVal.addHeader(Constants.HEADER_CONTENT_TYPE, theBinary.getContentType()); 093 return retVal; 094 } 095 096 @Override 097 public IHttpRequest createByteRequest(FhirContext theContext, String theContents, String theContentType, EncodingEnum theEncoding) { 098 IHttpRequest retVal = createHttpRequest(theContents); 099 addHeadersToRequest(retVal, theEncoding, theContext); 100 retVal.addHeader(Constants.HEADER_CONTENT_TYPE, theContentType + Constants.HEADER_SUFFIX_CT_UTF_8); 101 return retVal; 102 } 103 104 @Override 105 public IHttpRequest createGetRequest(FhirContext theContext, EncodingEnum theEncoding) { 106 IHttpRequest retVal = createHttpRequest(); 107 addHeadersToRequest(retVal, theEncoding, theContext); 108 return retVal; 109 } 110 111 protected abstract IHttpRequest createHttpRequest(); 112 113 protected abstract IHttpRequest createHttpRequest(byte[] theContent); 114 115 protected abstract IHttpRequest createHttpRequest(Map<String, List<String>> theParams); 116 117 protected abstract IHttpRequest createHttpRequest(String theContents); 118 119 @Override 120 public IHttpRequest createParamRequest(FhirContext theContext, Map<String, List<String>> theParams, EncodingEnum theEncoding) { 121 IHttpRequest retVal = createHttpRequest(theParams); 122 addHeadersToRequest(retVal, theEncoding, theContext); 123 return retVal; 124 } 125 126 private StringBuilder newHeaderBuilder(StringBuilder theUrlBase) { 127 StringBuilder b = new StringBuilder(); 128 b.append(theUrlBase); 129 if (theUrlBase.length() > 0 && theUrlBase.charAt(theUrlBase.length() - 1) == '/') { 130 b.deleteCharAt(b.length() - 1); 131 } 132 return b; 133 } 134}