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134 lines (116 loc) · 4.02 KB
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/*
* Copyright © 2012 The Feign Authors (feign@commonhaus.dev)
*
* 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.
*/
package feign.form;
import static feign.form.util.PojoUtil.isUserPojo;
import static feign.form.util.PojoUtil.toMap;
import static java.nio.charset.StandardCharsets.UTF_8;
import static java.util.Arrays.asList;
import static lombok.AccessLevel.PRIVATE;
import feign.RequestTemplate;
import feign.codec.EncodeException;
import feign.codec.Encoder;
import java.lang.reflect.Type;
import java.nio.charset.Charset;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Pattern;
import lombok.experimental.FieldDefaults;
import lombok.val;
/**
* A Feign's form encoder.
*
* @author Artem Labazin
*/
@FieldDefaults(level = PRIVATE, makeFinal = true)
public class FormEncoder implements Encoder {
private static final String CONTENT_TYPE_HEADER;
private static final Pattern CHARSET_PATTERN;
static {
CONTENT_TYPE_HEADER = "Content-Type";
CHARSET_PATTERN = Pattern.compile("(?<=charset=)([\\w\\-]+)");
}
Encoder delegate;
Map<ContentType, ContentProcessor> processors;
/** Constructor with the default Feign's encoder as a delegate. */
public FormEncoder() {
this(new Encoder.Default());
}
/**
* Constructor with specified delegate encoder.
*
* @param delegate delegate encoder, if this encoder couldn't encode object.
*/
public FormEncoder(Encoder delegate) {
this.delegate = delegate;
val list =
asList(new MultipartFormContentProcessor(delegate), new UrlencodedFormContentProcessor());
processors = new HashMap<ContentType, ContentProcessor>(list.size(), 1.F);
for (ContentProcessor processor : list) {
processors.put(processor.getSupportedContentType(), processor);
}
}
@Override
@SuppressWarnings("unchecked")
public void encode(Object object, Type bodyType, RequestTemplate template)
throws EncodeException {
String contentTypeValue = getContentTypeValue(template.headers());
val contentType = ContentType.of(contentTypeValue);
if (processors.containsKey(contentType) == false) {
delegate.encode(object, bodyType, template);
return;
}
Map<String, Object> data;
if (object instanceof Map) {
data = (Map<String, Object>) object;
} else if (isUserPojo(bodyType)) {
data = toMap(object);
} else {
delegate.encode(object, bodyType, template);
return;
}
val charset = getCharset(contentTypeValue);
processors.get(contentType).process(template, charset, data);
}
/**
* Returns {@link ContentProcessor} for specific {@link ContentType}.
*
* @param type a type for content processor search.
* @return {@link ContentProcessor} instance for specified type or null.
*/
public final ContentProcessor getContentProcessor(ContentType type) {
return processors.get(type);
}
@SuppressWarnings("PMD.AvoidBranchingStatementAsLastInLoop")
private String getContentTypeValue(Map<String, Collection<String>> headers) {
for (val entry : headers.entrySet()) {
if (!entry.getKey().equalsIgnoreCase(CONTENT_TYPE_HEADER)) {
continue;
}
for (val contentTypeValue : entry.getValue()) {
if (contentTypeValue == null) {
continue;
}
return contentTypeValue;
}
}
return null;
}
private Charset getCharset(String contentTypeValue) {
val matcher = CHARSET_PATTERN.matcher(contentTypeValue);
return matcher.find() ? Charset.forName(matcher.group(1)) : UTF_8;
}
}