Class SafeTokenReader

java.lang.Object

java.io.Reader

graphql.parser.SafeTokenReader

All Implemented Interfaces:

Closeable, AutoCloseable, Readable

public class SafeTokenReader
extends Reader

This reader will only emit a maximum number of characters from it. This is used to protect us from evil input.

If a graphql system does not have some max HTTP input limit, then this will help protect the system. This is a limit of last resort. Ideally the http input should be limited, but if its not, we have this.

Field Summary

Fields

Modifier and Type	Field	Description
private int	count
private final Reader	delegate
private final int	maxCharacters
private final Consumer<Integer>	whenMaxCharactersExceeded

Fields inherited from class Reader

lock

Constructor Summary

Constructors

Constructor	Description
SafeTokenReader(Reader delegate, int maxCharacters, Consumer<Integer> whenMaxCharactersExceeded)

Method Summary

Modifier and Type	Method	Description
private int	checkHowMany(int read, int howMany)
void	close()
void	mark(int readAheadLimit)
boolean	markSupported()
int	read()
int	read(char @NotNull [] buff)
int	read(char @NotNull [] buff, int off, int len)
int	read(@NotNull CharBuffer target)
boolean	ready()
void	reset()
long	skip(long n)

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

delegate

private final Reader delegate

maxCharacters

private final int maxCharacters

whenMaxCharactersExceeded

private final Consumer<Integer> whenMaxCharactersExceeded

count

private int count

Constructor Details

SafeTokenReader

public SafeTokenReader(Reader delegate,
 int maxCharacters,
 Consumer<Integer> whenMaxCharactersExceeded)

Method Details

checkHowMany

private int checkHowMany(int read,
 int howMany)

read

public int read(char @NotNull [] buff,
 int off,
 int len)
         throws IOException

Specified by:

read in class Reader

Throws:

IOException

read

public int read()
         throws IOException

Overrides:

read in class Reader

Throws:

IOException

read

public int read(@NotNull
 @NotNull CharBuffer target)
         throws IOException

Specified by:

read in interface Readable

Overrides:

read in class Reader

Throws:

IOException

read

public int read(char @NotNull [] buff)
         throws IOException

Overrides:

read in class Reader

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Specified by:

close in class Reader

Throws:

IOException

skip

public long skip(long n)
          throws IOException

Overrides:

skip in class Reader

Throws:

IOException

ready

public boolean ready()
              throws IOException

Overrides:

ready in class Reader

Throws:

IOException

markSupported

public boolean markSupported()

Overrides:

markSupported in class Reader

mark

public void mark(int readAheadLimit)
          throws IOException

Overrides:

mark in class Reader

Throws:

IOException

reset

public void reset()
           throws IOException

Overrides:

reset in class Reader

Throws:

IOException