src/main/java/org/takes/rq/form/RqFormBase.java
/*
* The MIT License (MIT)
*
* Copyright (c) 2014-2024 Yegor Bugayenko
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package org.takes.rq.form;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URLDecoder;
import java.nio.charset.Charset;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArrayList;
import lombok.EqualsAndHashCode;
import org.cactoos.Text;
import org.cactoos.text.FormattedText;
import org.cactoos.text.Lowered;
import org.cactoos.text.TextOf;
import org.cactoos.text.Trimmed;
import org.cactoos.text.UncheckedText;
import org.takes.HttpException;
import org.takes.Request;
import org.takes.misc.VerboseIterable;
import org.takes.rq.RqForm;
import org.takes.rq.RqPrint;
import org.takes.rq.RqWrap;
/**
* Base implementation of {@link RqForm}.
* @since 0.33
*/
@SuppressWarnings("PMD.AvoidInstantiatingObjectsInLoops")
@EqualsAndHashCode(callSuper = true)
public final class RqFormBase extends RqWrap implements RqForm {
/**
* Request.
*/
private final Request req;
/**
* Saved map.
*/
private final List<Map<String, List<String>>> saved;
/**
* Ctor.
* @param request Original request
*/
public RqFormBase(final Request request) {
super(request);
this.saved = new CopyOnWriteArrayList<>();
this.req = request;
}
@Override
public Iterable<String> param(final CharSequence key)
throws IOException {
final List<String> values = this.map().getOrDefault(
new UncheckedText(
new Lowered(key.toString())
).asString(),
Collections.emptyList()
);
final Iterable<String> iter;
if (values.isEmpty()) {
iter = new VerboseIterable<>(
Collections.emptyList(),
new FormattedText(
"there are no params \"%s\" among %d others: %s",
key, this.map().size(), this.map().keySet()
)
);
} else {
iter = new VerboseIterable<>(
values,
new FormattedText(
"there are only %d params by name \"%s\"",
values.size(), key
)
);
}
return iter;
}
@Override
public Iterable<String> names() throws IOException {
return this.map().keySet();
}
/**
* Decode from URL.
* @param txt Text
* @return Decoded
*/
private static String decode(final Text txt) {
final String body = new UncheckedText(txt).asString();
try {
return URLDecoder.decode(
body,
Charset.defaultCharset().name()
);
} catch (final UnsupportedEncodingException ex) {
throw new IllegalStateException(
String.format("Failed to decode '%s'", body),
ex
);
}
}
/**
* Create map of request parameters.
* @return Parameters map or empty map in case of error.
* @throws IOException If something fails reading or parsing body
*/
private Map<String, List<String>> map() throws IOException {
if (this.saved.isEmpty()) {
this.saved.add(this.freshMap());
}
return this.saved.get(0);
}
/**
* Create map of request parameter.
* @return Parameters map or empty map in case of error.
* @throws IOException If something fails reading or parsing body
*/
private Map<String, List<String>> freshMap() throws IOException {
final String body = new RqPrint(this.req).printBody();
final Map<String, List<String>> map = new HashMap<>(1);
for (final String pair : body.split("&")) {
if (pair.isEmpty()) {
continue;
}
final String[] parts = pair.split("=", 2);
if (parts.length < 2) {
throw new HttpException(
HttpURLConnection.HTTP_BAD_REQUEST,
String.format(
"invalid form body pair: %s", pair
)
);
}
final String key = RqFormBase.decode(new Lowered(parts[0]));
if (!map.containsKey(key)) {
map.put(key, new LinkedList<>());
}
map.get(key).add(
RqFormBase.decode(
new Trimmed(new TextOf(parts[1]))
)
);
}
return map;
}
}