Fix #218: CookieDecoder.decode() throws StackOverflowError
- Rewrote key-value decoder not using a regular expression
This commit is contained in:
Trustin Lee
parent
2721d1e9c7
commit
b2d8813bf3
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@ -21,8 +21,6 @@ import java.util.Collections;
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import java.util.List;
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import java.util.Set;
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import java.util.TreeSet;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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/**
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* Decodes an HTTP header value into {@link Cookie}s. This decoder can decode
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@ -41,12 +39,6 @@ import java.util.regex.Pattern;
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*/
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public class CookieDecoder {
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private static final Pattern PATTERN = Pattern.compile(
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// See: https://github.com/netty/netty/pull/96
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//"(?:\\s|[;,])*\\$*([^;=]+)(?:=(?:[\"']((?:\\\\.|[^\"])*)[\"']|([^;,]*)))?(\\s*(?:[;,]+\\s*|$))"
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"(?:\\s|[;,])*\\$*([^;=]+)(?:=(?:[\"']((?:\\\\.|[^\"])*)[\"']|([^;]*)))?(\\s*(?:[;,]+\\s*|$))"
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);
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private static final String COMMA = ",";
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/**
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@ -190,59 +182,128 @@ public class CookieDecoder {
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return cookies;
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}
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private static void extractKeyValuePairs(
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String header, List<String> names, List<String> values) {
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Matcher m = PATTERN.matcher(header);
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int pos = 0;
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String name = null;
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String value = null;
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String separator = null;
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while (m.find(pos)) {
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pos = m.end();
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final String header, final List<String> names, final List<String> values) {
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// Extract name and value pair from the match.
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String newName = m.group(1);
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String newValue = m.group(3);
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if (newValue == null) {
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newValue = decodeValue(m.group(2));
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final int headerLen = header.length();
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loop: for (int i = 0;;) {
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// Skip spaces and separators.
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for (;;) {
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if (i == headerLen) {
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break loop;
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}
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String newSeparator = m.group(4);
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if (name == null) {
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name = newName;
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value = newValue == null? "" : newValue;
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separator = newSeparator;
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switch (header.charAt(i)) {
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case '\t': case '\n': case 0x0b: case '\f': case '\r':
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case ' ': case ',': case ';':
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i ++;
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continue;
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}
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break;
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}
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if (newValue == null &&
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!CookieHeaderNames.DISCARD.equalsIgnoreCase(newName) &&
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!CookieHeaderNames.SECURE.equalsIgnoreCase(newName) &&
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!CookieHeaderNames.HTTPONLY.equalsIgnoreCase(newName)) {
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value = value + separator + newName;
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separator = newSeparator;
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// Skip '$'.
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for (;;) {
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if (i == headerLen) {
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break loop;
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}
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if (header.charAt(i) == '$') {
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i ++;
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continue;
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}
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break;
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}
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String name;
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String value;
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if (i == headerLen) {
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name = null;
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value = null;
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} else {
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int newNameStart = i;
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keyValLoop: for (;;) {
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switch (header.charAt(i)) {
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case ';':
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// NAME; (no value till ';')
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name = header.substring(newNameStart, i);
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value = null;
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break keyValLoop;
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case '=':
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// NAME=VALUE
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name = header.substring(newNameStart, i);
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i ++;
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if (i == headerLen) {
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// NAME= (empty value, i.e. nothing after '=')
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value = "";
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break keyValLoop;
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}
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int newValueStart = i;
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char c = header.charAt(i);
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if (c == '"' || c == '\'') {
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// NAME="VALUE" or NAME='VALUE'
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StringBuilder newValueBuf = new StringBuilder(header.length() - i);
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final char q = c;
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boolean hadBackslash = false;
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i ++;
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for (;;) {
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if (i == headerLen) {
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value = newValueBuf.toString();
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break keyValLoop;
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}
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if (hadBackslash) {
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hadBackslash = false;
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c = header.charAt(i ++);
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switch (c) {
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case '\\': case '"': case '\'':
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// Escape last backslash.
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newValueBuf.setCharAt(newValueBuf.length() - 1, c);
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break;
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default:
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// Do not escape last backslash.
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newValueBuf.append(c);
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}
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} else {
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c = header.charAt(i ++);
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if (c == q) {
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value = newValueBuf.toString();
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break keyValLoop;
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}
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newValueBuf.append(c);
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if (c == '\\') {
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hadBackslash = true;
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}
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}
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}
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} else {
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// NAME=VALUE;
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int semiPos = header.indexOf(';', i);
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if (semiPos > 0) {
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value = header.substring(newValueStart, semiPos);
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i = semiPos;
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} else {
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value = header.substring(newValueStart);
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i = headerLen;
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}
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}
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break keyValLoop;
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default:
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i ++;
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}
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if (i == headerLen) {
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// NAME (no value till the end of string)
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name = header.substring(newNameStart);
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value = null;
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break;
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}
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}
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}
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names.add(name);
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values.add(value);
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name = newName;
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value = newValue;
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separator = newSeparator;
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}
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// The last entry
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if (name != null) {
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names.add(name);
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values.add(value);
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}
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}
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private static String decodeValue(String value) {
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if (value == null) {
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return value;
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}
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return value.replace("\\\"", "\"").replace("\\\\", "\\");
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}
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}
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@ -363,4 +363,59 @@ public class CookieDecoderTest {
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assertEquals("HTTPOnly", c.getName());
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assertEquals("", c.getValue());
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}
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@Test
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public void testDecodingLongValue() {
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String longValue =
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"b!!!$Q!!$ha!!<NC=MN(F!!%#4!!<NC=MN(F!!2!d!!!!#=IvZB!!2,F!!!!'=KqtH!!2-9!!!!" +
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"'=IvZM!!3f:!!!!$=HbQW!!3g'!!!!%=J^wI!!3g-!!!!%=J^wI!!3g1!!!!$=HbQW!!3g2!!!!" +
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"$=HbQW!!3g5!!!!%=J^wI!!3g9!!!!$=HbQW!!3gT!!!!$=HbQW!!3gX!!!!#=J^wI!!3gY!!!!" +
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"#=J^wI!!3gh!!!!$=HbQW!!3gj!!!!$=HbQW!!3gr!!!!$=HbQW!!3gx!!!!#=J^wI!!3h!!!!!" +
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"$=HbQW!!3h$!!!!#=J^wI!!3h'!!!!$=HbQW!!3h,!!!!$=HbQW!!3h0!!!!%=J^wI!!3h1!!!!" +
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"#=J^wI!!3h2!!!!$=HbQW!!3h4!!!!$=HbQW!!3h7!!!!$=HbQW!!3h8!!!!%=J^wI!!3h:!!!!" +
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"#=J^wI!!3h@!!!!%=J^wI!!3hB!!!!$=HbQW!!3hC!!!!$=HbQW!!3hL!!!!$=HbQW!!3hQ!!!!" +
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"$=HbQW!!3hS!!!!%=J^wI!!3hU!!!!$=HbQW!!3h[!!!!$=HbQW!!3h^!!!!$=HbQW!!3hd!!!!" +
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"%=J^wI!!3he!!!!%=J^wI!!3hf!!!!%=J^wI!!3hg!!!!$=HbQW!!3hh!!!!%=J^wI!!3hi!!!!" +
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"%=J^wI!!3hv!!!!$=HbQW!!3i/!!!!#=J^wI!!3i2!!!!#=J^wI!!3i3!!!!%=J^wI!!3i4!!!!" +
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"$=HbQW!!3i7!!!!$=HbQW!!3i8!!!!$=HbQW!!3i9!!!!%=J^wI!!3i=!!!!#=J^wI!!3i>!!!!" +
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"%=J^wI!!3iD!!!!$=HbQW!!3iF!!!!#=J^wI!!3iH!!!!%=J^wI!!3iM!!!!%=J^wI!!3iS!!!!" +
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"#=J^wI!!3iU!!!!%=J^wI!!3iZ!!!!#=J^wI!!3i]!!!!%=J^wI!!3ig!!!!%=J^wI!!3ij!!!!" +
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"%=J^wI!!3ik!!!!#=J^wI!!3il!!!!$=HbQW!!3in!!!!%=J^wI!!3ip!!!!$=HbQW!!3iq!!!!" +
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"$=HbQW!!3it!!!!%=J^wI!!3ix!!!!#=J^wI!!3j!!!!!$=HbQW!!3j%!!!!$=HbQW!!3j'!!!!" +
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"%=J^wI!!3j(!!!!%=J^wI!!9mJ!!!!'=KqtH!!=SE!!<NC=MN(F!!?VS!!<NC=MN(F!!Zw`!!!!" +
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"%=KqtH!!j+C!!<NC=MN(F!!j+M!!<NC=MN(F!!j+a!!<NC=MN(F!!j,.!!<NC=MN(F!!n>M!!!!" +
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"'=KqtH!!s1X!!!!$=MMyc!!s1_!!!!#=MN#O!!ypn!!!!'=KqtH!!ypr!!!!'=KqtH!#%h!!!!!" +
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"%=KqtH!#%o!!!!!'=KqtH!#)H6!!<NC=MN(F!#*%'!!!!%=KqtH!#+k(!!!!'=KqtH!#-E!!!!!" +
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"'=KqtH!#1)w!!!!'=KqtH!#1)y!!!!'=KqtH!#1*M!!!!#=KqtH!#1*p!!!!'=KqtH!#14Q!!<N" +
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"C=MN(F!#14S!!<NC=MN(F!#16I!!<NC=MN(F!#16N!!<NC=MN(F!#16X!!<NC=MN(F!#16k!!<N" +
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"C=MN(F!#17@!!<NC=MN(F!#17A!!<NC=MN(F!#1Cq!!!!'=KqtH!#7),!!!!#=KqtH!#7)b!!!!" +
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"#=KqtH!#7Ww!!!!'=KqtH!#?cQ!!!!'=KqtH!#His!!!!'=KqtH!#Jrh!!!!'=KqtH!#O@M!!<N" +
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"C=MN(F!#O@O!!<NC=MN(F!#OC6!!<NC=MN(F!#Os.!!!!#=KqtH!#YOW!!!!#=H/Li!#Zat!!!!" +
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"'=KqtH!#ZbI!!!!%=KqtH!#Zbc!!!!'=KqtH!#Zbs!!!!%=KqtH!#Zby!!!!'=KqtH!#Zce!!!!" +
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"'=KqtH!#Zdc!!!!%=KqtH!#Zea!!!!'=KqtH!#ZhI!!!!#=KqtH!#ZiD!!!!'=KqtH!#Zis!!!!" +
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"'=KqtH!#Zj0!!!!#=KqtH!#Zj1!!!!'=KqtH!#Zj[!!!!'=KqtH!#Zj]!!!!'=KqtH!#Zj^!!!!" +
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"'=KqtH!#Zjb!!!!'=KqtH!#Zk!!!!!'=KqtH!#Zk6!!!!#=KqtH!#Zk9!!!!%=KqtH!#Zk<!!!!" +
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"'=KqtH!#Zl>!!!!'=KqtH!#]9R!!!!$=H/Lt!#]I6!!!!#=KqtH!#]Z#!!!!%=KqtH!#^*N!!!!" +
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"#=KqtH!#^:m!!!!#=KqtH!#_*_!!!!%=J^wI!#`-7!!!!#=KqtH!#`T>!!!!'=KqtH!#`T?!!!!" +
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"'=KqtH!#`TA!!!!'=KqtH!#`TB!!!!'=KqtH!#`TG!!!!'=KqtH!#`TP!!!!#=KqtH!#`U,!!!!" +
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"'=KqtH!#`U/!!!!'=KqtH!#`U0!!!!#=KqtH!#`U9!!!!'=KqtH!#aEQ!!!!%=KqtH!#b<)!!!!" +
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"'=KqtH!#c9-!!!!%=KqtH!#dxC!!!!%=KqtH!#dxE!!!!%=KqtH!#ev$!!!!'=KqtH!#fBi!!!!" +
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"#=KqtH!#fBj!!!!'=KqtH!#fG)!!!!'=KqtH!#fG+!!!!'=KqtH!#g<d!!!!'=KqtH!#g<e!!!!" +
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"'=KqtH!#g=J!!!!'=KqtH!#gat!!!!#=KqtH!#s`D!!!!#=J_#p!#sg?!!!!#=J_#p!#t<a!!!!" +
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"#=KqtH!#t<c!!!!#=KqtH!#trY!!!!$=JiYj!#vA$!!!!'=KqtH!#xs_!!!!'=KqtH!$$rO!!!!" +
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"#=KqtH!$$rP!!!!#=KqtH!$(!%!!!!'=KqtH!$)]o!!!!%=KqtH!$,@)!!!!'=KqtH!$,k]!!!!" +
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"'=KqtH!$1]+!!!!%=KqtH!$3IO!!!!%=KqtH!$3J#!!!!'=KqtH!$3J.!!!!'=KqtH!$3J:!!!!" +
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"#=KqtH!$3JH!!!!#=KqtH!$3JI!!!!#=KqtH!$3JK!!!!%=KqtH!$3JL!!!!'=KqtH!$3JS!!!!" +
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"'=KqtH!$8+M!!!!#=KqtH!$99d!!!!%=KqtH!$:Lw!!!!#=LK+x!$:N@!!!!#=KqtG!$:NC!!!!" +
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"#=KqtG!$:hW!!!!'=KqtH!$:i[!!!!'=KqtH!$:ih!!!!'=KqtH!$:it!!!!'=KqtH!$:kO!!!!" +
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"'=KqtH!$>*B!!!!'=KqtH!$>hD!!!!+=J^x0!$?lW!!!!'=KqtH!$?ll!!!!'=KqtH!$?lm!!!!" +
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"%=KqtH!$?mi!!!!'=KqtH!$?mx!!!!'=KqtH!$D7]!!!!#=J_#p!$D@T!!!!#=J_#p!$V<g!!!!" +
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"'=KqtH";
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Set<Cookie> cookies = new CookieDecoder().decode("bh=\"" + longValue + "\";");
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assertEquals(1, cookies.size());
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Cookie c = cookies.iterator().next();
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assertEquals("bh", c.getName());
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assertEquals(longValue, c.getValue());
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}
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}
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