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//
// ========================================================================
// Copyright (c) 1995-2019 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package com.signalfx.shaded.jetty.http;
import java.util.Objects;
import com.signalfx.shaded.jetty.util.StringUtil;
/**
* An HTTP Field
*/
public class HttpField
{
private static final String ZEROQUALITY = "q=0";
private final HttpHeader _header;
private final String _name;
private final String _value;
// cached hashcode for case insensitive name
private int hash = 0;
public HttpField(HttpHeader header, String name, String value)
{
_header = header;
if (_header != null && name == null)
_name = _header.asString();
else
_name = Objects.requireNonNull(name);
_value = value;
}
public HttpField(HttpHeader header, String value)
{
this(header, header.asString(), value);
}
public HttpField(HttpHeader header, HttpHeaderValue value)
{
this(header, header.asString(), value.asString());
}
public HttpField(String name, String value)
{
this(HttpHeader.CACHE.get(name), name, value);
}
public HttpHeader getHeader()
{
return _header;
}
public String getName()
{
return _name;
}
public String getLowerCaseName()
{
return _header != null ? _header.lowerCaseName() : StringUtil.asciiToLowerCase(_name);
}
public String getValue()
{
return _value;
}
public int getIntValue()
{
return Integer.parseInt(_value);
}
public long getLongValue()
{
return Long.parseLong(_value);
}
public String[] getValues()
{
if (_value == null)
return null;
QuotedCSV list = new QuotedCSV(false, _value);
return list.getValues().toArray(new String[list.size()]);
}
/**
* Look for a value in a possible multi valued field
*
* @param search Values to search for (case insensitive)
* @return True iff the value is contained in the field value entirely or
* as an element of a quoted comma separated list. List element parameters (eg qualities) are ignored,
* except if they are q=0, in which case the item itself is ignored.
*/
public boolean contains(String search)
{
if (search == null)
return _value == null;
if (search.isEmpty())
return false;
if (_value == null)
return false;
if (search.equals(_value))
return true;
search = StringUtil.asciiToLowerCase(search);
int state = 0;
int match = 0;
int param = 0;
for (int i = 0; i < _value.length(); i++)
{
char c = _value.charAt(i);
switch (state)
{
case 0: // initial white space
switch (c)
{
case '"': // open quote
match = 0;
state = 2;
break;
case ',': // ignore leading empty field
break;
case ';': // ignore leading empty field parameter
param = -1;
match = -1;
state = 5;
break;
case ' ': // more white space
case '\t':
break;
default: // character
match = Character.toLowerCase(c) == search.charAt(0) ? 1 : -1;
state = 1;
break;
}
break;
case 1: // In token
switch (c)
{
case ',': // next field
// Have we matched the token?
if (match == search.length())
return true;
state = 0;
break;
case ';':
param = match >= 0 ? 0 : -1;
state = 5; // parameter
break;
default:
if (match > 0)
{
if (match < search.length())
match = Character.toLowerCase(c) == search.charAt(match) ? (match + 1) : -1;
else if (c != ' ' && c != '\t')
match = -1;
}
break;
}
break;
case 2: // In Quoted token
switch (c)
{
case '\\': // quoted character
state = 3;
break;
case '"': // end quote
state = 4;
break;
default:
if (match >= 0)
{
if (match < search.length())
match = Character.toLowerCase(c) == search.charAt(match) ? (match + 1) : -1;
else
match = -1;
}
}
break;
case 3: // In Quoted character in quoted token
if (match >= 0)
{
if (match < search.length())
match = Character.toLowerCase(c) == search.charAt(match) ? (match + 1) : -1;
else
match = -1;
}
state = 2;
break;
case 4: // WS after end quote
switch (c)
{
case ' ': // white space
case '\t': // white space
break;
case ';':
state = 5; // parameter
break;
case ',': // end token
// Have we matched the token?
if (match == search.length())
return true;
state = 0;
break;
default:
// This is an illegal token, just ignore
match = -1;
}
break;
case 5: // parameter
switch (c)
{
case ',': // end token
// Have we matched the token and not q=0?
if (param != ZEROQUALITY.length() && match == search.length())
return true;
param = 0;
state = 0;
break;
case ' ': // white space
case '\t': // white space
break;
default:
if (param >= 0)
{
if (param < ZEROQUALITY.length())
param = Character.toLowerCase(c) == ZEROQUALITY.charAt(param) ? (param + 1) : -1;
else if (c != '0' && c != '.')
param = -1;
}
}
break;
default:
throw new IllegalStateException();
}
}
return param != ZEROQUALITY.length() && match == search.length();
}
@Override
public String toString()
{
String v = getValue();
return getName() + ": " + (v == null ? "" : v);
}
public boolean isSameName(HttpField field)
{
if (field == null)
return false;
if (field == this)
return true;
if (_header != null && _header == field.getHeader())
return true;
return _name.equalsIgnoreCase(field.getName());
}
private int nameHashCode()
{
int h = this.hash;
int len = _name.length();
if (h == 0 && len > 0)
{
for (int i = 0; i < len; i++)
{
// simple case insensitive hash
char c = _name.charAt(i);
// assuming us-ascii (per last paragraph on http://tools.ietf.org/html/rfc7230#section-3.2.4)
if ((c >= 'a' && c <= 'z'))
c -= 0x20;
h = 31 * h + c;
}
this.hash = h;
}
return h;
}
@Override
public int hashCode()
{
int vhc = Objects.hashCode(_value);
if (_header == null)
return vhc ^ nameHashCode();
return vhc ^ _header.hashCode();
}
@Override
public boolean equals(Object o)
{
if (o == this)
return true;
if (!(o instanceof HttpField))
return false;
HttpField field = (HttpField)o;
if (_header != field.getHeader())
return false;
if (!_name.equalsIgnoreCase(field.getName()))
return false;
return Objects.equals(_value, field.getValue());
}
public static class IntValueHttpField extends HttpField
{
private final int _int;
public IntValueHttpField(HttpHeader header, String name, String value, int intValue)
{
super(header, name, value);
_int = intValue;
}
public IntValueHttpField(HttpHeader header, String name, String value)
{
this(header, name, value, Integer.parseInt(value));
}
public IntValueHttpField(HttpHeader header, String name, int intValue)
{
this(header, name, Integer.toString(intValue), intValue);
}
public IntValueHttpField(HttpHeader header, int value)
{
this(header, header.asString(), value);
}
@Override
public int getIntValue()
{
return _int;
}
@Override
public long getLongValue()
{
return _int;
}
}
public static class LongValueHttpField extends HttpField
{
private final long _long;
public LongValueHttpField(HttpHeader header, String name, String value, long longValue)
{
super(header, name, value);
_long = longValue;
}
public LongValueHttpField(HttpHeader header, String name, String value)
{
this(header, name, value, Long.parseLong(value));
}
public LongValueHttpField(HttpHeader header, String name, long value)
{
this(header, name, Long.toString(value), value);
}
public LongValueHttpField(HttpHeader header, long value)
{
this(header, header.asString(), value);
}
@Override
public int getIntValue()
{
return (int)_long;
}
@Override
public long getLongValue()
{
return _long;
}
}
}
