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package com.firefly.codec.http2.model;
import java.util.ArrayList;
import java.util.Objects;
import com.firefly.utils.StringUtils;
public class HttpField {
private final static 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) {
this.header = header;
this.name = name;
this.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 getValue() {
return value;
}
public int getIntValue() {
return Integer.valueOf(value);
}
public long getLongValue() {
return Long.valueOf(value);
}
public String[] getValues() {
ArrayList list = new ArrayList<>();
int state = 0;
int start = 0;
int end = 0;
StringBuilder builder = new StringBuilder();
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
state = 2;
break;
case ',': // ignore leading empty field
break;
case ' ': // more white space
case '\t':
break;
default: // character
start = i;
end = i;
state = 1;
}
break;
case 1: // In token
switch (c) {
case ',': // next field
list.add(value.substring(start, end + 1));
state = 0;
break;
case ' ': // more white space
case '\t':
break;
default:
end = i;
}
break;
case 2: // In Quoted
switch (c) {
case '\\': // next field
state = 3;
break;
case '"': // end quote
list.add(builder.toString());
builder.setLength(0);
state = 4;
break;
default:
builder.append(c);
}
break;
case 3: // In Quoted Quoted
builder.append(c);
state = 2;
break;
case 4: // WS after end quote
switch (c) {
case ' ': // white space
case '\t': // white space
break;
case ',': // white space
state = 0;
break;
default:
throw new IllegalArgumentException("c=" + (int) c);
}
break;
}
}
switch (state) {
case 0:
break;
case 1:
list.add(value.substring(start, end + 1));
break;
case 4:
break;
default:
throw new IllegalArgumentException("state=" + state);
}
return list.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.length() == 0)
return false;
if (value == null)
return false;
search = StringUtils.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;
if (name.equalsIgnoreCase(field.getName()))
return true;
return false;
}
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() {
if (header == null)
return value.hashCode() ^ nameHashCode();
return value.hashCode() ^ 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;
if (value == null && field.getValue() != null)
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.valueOf(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.valueOf(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;
}
}
}
