package ca.uhn.fhir.rest.param;
/*
* #%L
* HAPI FHIR - Core Library
* %%
* Copyright (C) 2014 - 2017 University Health Network
* %%
* 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.
* #L%
*/
import static org.apache.commons.lang3.StringUtils.isBlank;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.nio.charset.Charset;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.Validate;
import org.hl7.fhir.instance.model.api.IBaseBinary;
import org.hl7.fhir.instance.model.api.IBaseResource;
import ca.uhn.fhir.context.FhirContext;
import ca.uhn.fhir.context.FhirVersionEnum;
import ca.uhn.fhir.model.api.IResource;
import ca.uhn.fhir.model.api.ResourceMetadataKeyEnum;
import ca.uhn.fhir.model.api.TagList;
import ca.uhn.fhir.parser.DataFormatException;
import ca.uhn.fhir.parser.IParser;
import ca.uhn.fhir.rest.api.RestOperationTypeEnum;
import ca.uhn.fhir.rest.method.BaseMethodBinding;
import ca.uhn.fhir.rest.method.IParameter;
import ca.uhn.fhir.rest.method.MethodUtil;
import ca.uhn.fhir.rest.method.RequestDetails;
import ca.uhn.fhir.rest.server.Constants;
import ca.uhn.fhir.rest.server.EncodingEnum;
import ca.uhn.fhir.rest.server.IResourceProvider;
import ca.uhn.fhir.rest.server.RestfulServerUtils;
import ca.uhn.fhir.rest.server.exceptions.InternalErrorException;
import ca.uhn.fhir.rest.server.exceptions.InvalidRequestException;
public class ResourceParameter implements IParameter {
private Mode myMode;
private Class<? extends IBaseResource> myResourceType;
public ResourceParameter(Class<? extends IResource> theParameterType, Object theProvider, Mode theMode) {
Validate.notNull(theParameterType, "theParameterType can not be null");
Validate.notNull(theMode, "theMode can not be null");
myResourceType = theParameterType;
myMode = theMode;
Class<? extends IBaseResource> providerResourceType = null;
if (theProvider instanceof IResourceProvider) {
providerResourceType = ((IResourceProvider) theProvider).getResourceType();
}
if (Modifier.isAbstract(myResourceType.getModifiers()) && providerResourceType != null) {
myResourceType = providerResourceType;
}
}
public Mode getMode() {
return myMode;
}
public Class<? extends IBaseResource> getResourceType() {
return myResourceType;
}
@Override
public void initializeTypes(Method theMethod, Class<? extends Collection<?>> theOuterCollectionType, Class<? extends Collection<?>> theInnerCollectionType, Class<?> theParameterType) {
// ignore for now
}
@Override
public void translateClientArgumentIntoQueryArgument(FhirContext theContext, Object theSourceClientArgument, Map<String, List<String>> theTargetQueryArguments, IBaseResource theTargetResource) throws InternalErrorException {
// TODO Auto-generated method stub
}
@Override
public Object translateQueryParametersIntoServerArgument(RequestDetails theRequest, BaseMethodBinding<?> theMethodBinding) throws InternalErrorException, InvalidRequestException {
switch (myMode) {
case BODY:
try {
return IOUtils.toString(createRequestReader(theRequest));
} catch (IOException e) {
// Shouldn't happen since we're reading from a byte array
throw new InternalErrorException("Failed to load request", e);
}
case BODY_BYTE_ARRAY:
return theRequest.loadRequestContents();
case ENCODING:
return RestfulServerUtils.determineRequestEncodingNoDefault(theRequest);
case RESOURCE:
default:
return parseResourceFromRequest(theRequest, theMethodBinding, myResourceType);
}
// }
}
public static Reader createRequestReader(RequestDetails theRequest, Charset charset) {
Reader requestReader = new InputStreamReader(new ByteArrayInputStream(theRequest.loadRequestContents()), charset);
return requestReader;
}
public static Reader createRequestReader(RequestDetails theRequest) {
return createRequestReader(theRequest, determineRequestCharset(theRequest));
}
public static Charset determineRequestCharset(RequestDetails theRequest) {
Charset charset = theRequest.getCharset();
if (charset == null) {
charset = Charset.forName("UTF-8");
}
return charset;
}
@SuppressWarnings("unchecked")
public static <T extends IBaseResource> T loadResourceFromRequest(RequestDetails theRequest, BaseMethodBinding<?> theMethodBinding, Class<T> theResourceType) {
FhirContext ctx = theRequest.getServer().getFhirContext();
final Charset charset = determineRequestCharset(theRequest);
Reader requestReader = createRequestReader(theRequest, charset);
RestOperationTypeEnum restOperationType = theMethodBinding != null ? theMethodBinding.getRestOperationType() : null;
EncodingEnum encoding = RestfulServerUtils.determineRequestEncodingNoDefault(theRequest);
if (encoding == null) {
String ctValue = theRequest.getHeader(Constants.HEADER_CONTENT_TYPE);
if (ctValue != null) {
if (ctValue.startsWith("application/x-www-form-urlencoded")) {
//FIXME potential null access theMethodBinding
String msg = theRequest.getServer().getFhirContext().getLocalizer().getMessage(ResourceParameter.class, "invalidContentTypeInRequest", ctValue, theMethodBinding.getRestOperationType());
throw new InvalidRequestException(msg);
}
}
if (isBlank(ctValue)) {
/*
* If the client didn't send a content type, try to guess
*/
String body;
try {
body = IOUtils.toString(requestReader);
} catch (IOException e) {
// This shouldn't happen since we're reading from a byte array..
throw new InternalErrorException(e);
}
encoding = MethodUtil.detectEncodingNoDefault(body);
if (encoding == null) {
String msg = ctx.getLocalizer().getMessage(ResourceParameter.class, "noContentTypeInRequest", restOperationType);
throw new InvalidRequestException(msg);
}
requestReader = new InputStreamReader(new ByteArrayInputStream(theRequest.loadRequestContents()), charset);
} else {
String msg = ctx.getLocalizer().getMessage(ResourceParameter.class, "invalidContentTypeInRequest", ctValue, restOperationType);
throw new InvalidRequestException(msg);
}
}
IParser parser = encoding.newParser(ctx);
parser.setServerBaseUrl(theRequest.getFhirServerBase());
T retVal;
try {
if (theResourceType != null) {
retVal = parser.parseResource(theResourceType, requestReader);
} else {
retVal = (T) parser.parseResource(requestReader);
}
} catch (DataFormatException e) {
String msg = ctx.getLocalizer().getMessage(ResourceParameter.class, "failedToParseRequest", encoding.name(), e.getMessage());
throw new InvalidRequestException(msg);
}
if (theRequest.getServer().getFhirContext().getVersion().getVersion().equals(FhirVersionEnum.DSTU1)) {
TagList tagList = new TagList();
for (String nextTagComplete : theRequest.getHeaders(Constants.HEADER_CATEGORY)) {
MethodUtil.parseTagValue(tagList, nextTagComplete);
}
if (tagList.isEmpty() == false) {
((IResource) retVal).getResourceMetadata().put(ResourceMetadataKeyEnum.TAG_LIST, tagList);
}
}
return retVal;
}
public static IBaseResource parseResourceFromRequest(RequestDetails theRequest, BaseMethodBinding<?> theMethodBinding, Class<? extends IBaseResource> theResourceType) {
IBaseResource retVal = null;
if (IBaseBinary.class.isAssignableFrom(theResourceType)) {
String ct = theRequest.getHeader(Constants.HEADER_CONTENT_TYPE);
if (EncodingEnum.forContentTypeStrict(ct) == null) {
FhirContext ctx = theRequest.getServer().getFhirContext();
IBaseBinary binary = (IBaseBinary) ctx.getResourceDefinition("Binary").newInstance();
binary.setId(theRequest.getId());
binary.setContentType(ct);
binary.setContent(theRequest.loadRequestContents());
retVal = binary;
}
}
if (retVal == null) {
retVal = loadResourceFromRequest(theRequest, theMethodBinding, theResourceType);
}
return retVal;
}
public enum Mode {
BODY, BODY_BYTE_ARRAY, ENCODING, RESOURCE
}
}