io.helidon.webclient.http1.Http1StatusParser Maven / Gradle / Ivy
/*
* Copyright (c) 2023 Oracle and/or its affiliates.
*
* 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 io.helidon.webclient.http1;
import java.nio.charset.StandardCharsets;
import io.helidon.common.buffers.BufferData;
import io.helidon.common.buffers.Bytes;
import io.helidon.common.buffers.DataReader;
import io.helidon.http.Status;
/**
* Parser of HTTP/1.0 or HTTP/1.1 response status.
*/
public final class Http1StatusParser {
private Http1StatusParser() {
}
/**
* Read the status line from HTTP/1.0 or HTTP/1.1 response.
*
* @param reader data reader to obtain bytes from
* @param maxLength maximal number of bytes that can be processed before end of line is reached
* @return parsed HTTP status
* @throws java.lang.IllegalStateException in case of unexpected data
* @throws io.helidon.common.buffers.DataReader.InsufficientDataAvailableException when not enough data can be obtained
* @throws io.helidon.common.buffers.DataReader.IncorrectNewLineException in case we are missing correct end of line
* (CRLF)
* @throws java.lang.RuntimeException additional exceptions may be thrown from
* the reader, depending on its
* implementation
*/
public static Status readStatus(DataReader reader, int maxLength) {
int newLine = reader.findNewLine(maxLength);
if (newLine == maxLength) {
throw new IllegalStateException("HTTP Response did not contain HTTP status line. Line: \n"
+ reader.readBuffer(newLine).debugDataHex());
}
int slash = reader.findOrNewLine(Bytes.SLASH_BYTE, newLine);
if (slash == newLine) {
throw new IllegalStateException("HTTP Response did not contain HTTP status line. Line: \n"
+ reader.readBuffer(newLine).debugDataHex());
}
String protocol = reader.readAsciiString(slash);
if (!protocol.equals("HTTP")) {
throw new IllegalStateException("HTTP response did not contain correct status line. Protocol is not HTTP: \n"
+ BufferData.create(protocol.getBytes(StandardCharsets.US_ASCII))
.debugDataHex());
}
reader.skip(1); // /
newLine -= slash;
newLine--;
int space = reader.findOrNewLine(Bytes.SPACE_BYTE, newLine);
if (space == newLine) {
throw new IllegalStateException("HTTP Response did not contain HTTP status line. Line: HTTP/\n"
+ reader.readBuffer(newLine).debugDataHex());
}
String protocolVersion = reader.readAsciiString(space);
reader.skip(1); // space
newLine -= space;
newLine--;
if (!protocolVersion.equals("1.0") && !protocolVersion.equals("1.1")) {
throw new IllegalStateException("HTTP response did not contain correct status line. Version is not 1.0 or 1.1: \n"
+ BufferData.create(protocolVersion.getBytes(StandardCharsets.US_ASCII))
.debugDataHex());
}
// HTTP/1.0 or HTTP/1.1 200 OK
space = reader.findOrNewLine(Bytes.SPACE_BYTE, newLine);
if (space == newLine) {
throw new IllegalStateException("HTTP Response did not contain HTTP status line. Line: HTTP/1.0 or HTTP/1.1\n"
+ reader.readBuffer(newLine).debugDataHex());
}
String code = reader.readAsciiString(space);
reader.skip(1); // the new line
newLine -= space;
newLine--;
String phrase = reader.readAsciiString(newLine); // the rest of the line is reason phrase
reader.skip(2); // skip the last CRLF
try {
return Status.create(Integer.parseInt(code), phrase);
} catch (NumberFormatException e) {
throw new IllegalStateException("HTTP Response did not contain HTTP status line. Line HTTP/1.0 or HTTP/1.1 \n"
+ BufferData.create(code.getBytes(StandardCharsets.US_ASCII)) + "\n"
+ BufferData.create(phrase.getBytes(StandardCharsets.US_ASCII)));
}
}
}