graphql.parser.ParserOptions Maven / Gradle / Ivy
package graphql.parser;
import graphql.PublicApi;
import java.util.function.Consumer;
import static graphql.Assert.assertNotNull;
/**
* Options that control how the {@link Parser} behaves.
*/
@PublicApi
public class ParserOptions {
/**
* An graphql hacking vector is to send nonsensical queries that burn lots of parsing CPU time and burn
* memory representing a document that wont ever execute. To prevent this for most users, graphql-java
* set this value to 15000. ANTLR parsing time is linear to the number of tokens presented. The more you
* allow the longer it takes.
*
* If you want to allow more, then {@link #setDefaultParserOptions(ParserOptions)} allows you to change this
* JVM wide.
*/
public static final int MAX_QUERY_TOKENS = 15000;
private static ParserOptions defaultJvmParserOptions = newParserOptions()
.captureIgnoredChars(false)
.captureSourceLocation(true)
.captureLineComments(true)
.maxTokens(MAX_QUERY_TOKENS) // to prevent a billion laughs style attacks, we set a default for graphql-java
.build();
/**
* By default the Parser will not capture ignored characters. A static holds this default
* value in a JVM wide basis options object.
*
* Significant memory savings can be made if we do NOT capture ignored characters,
* especially in SDL parsing.
*
* @return the static default value on whether to capture ignored chars
*
* @see graphql.language.IgnoredChar
* @see graphql.language.SourceLocation
*/
public static ParserOptions getDefaultParserOptions() {
return defaultJvmParserOptions;
}
/**
* By default the Parser will not capture ignored characters. A static holds this default
* value in a JVM wide basis options object.
*
* Significant memory savings can be made if we do NOT capture ignored characters,
* especially in SDL parsing. So we have set this to false by default.
*
* This static can be set to true to allow the behavior of version 16.x or before.
*
* @param options - the new default JVM parser options
*
* @see graphql.language.IgnoredChar
* @see graphql.language.SourceLocation
*/
public static void setDefaultParserOptions(ParserOptions options) {
defaultJvmParserOptions = assertNotNull(options);
}
private final boolean captureIgnoredChars;
private final boolean captureSourceLocation;
private final boolean captureLineComments;
private final int maxTokens;
private final ParsingListener parsingListener;
private ParserOptions(Builder builder) {
this.captureIgnoredChars = builder.captureIgnoredChars;
this.captureSourceLocation = builder.captureSourceLocation;
this.captureLineComments = builder.captureLineComments;
this.maxTokens = builder.maxTokens;
this.parsingListener = builder.parsingListener;
}
/**
* Significant memory savings can be made if we do NOT capture ignored characters,
* especially in SDL parsing. So we have set this to false by default.
*
* @return true if ignored chars should be captured as AST nodes
*/
public boolean isCaptureIgnoredChars() {
return captureIgnoredChars;
}
/**
* Memory savings can be made if we do NOT set {@link graphql.language.SourceLocation}s
* on AST nodes, especially in SDL parsing.
*
* @return true if {@link graphql.language.SourceLocation}s should be captured as AST nodes
*
* @see graphql.language.SourceLocation
*/
public boolean isCaptureSourceLocation() {
return captureSourceLocation;
}
/**
* Single-line {@link graphql.language.Comment}s do not have any semantic meaning in
* GraphQL source documents, as such you may wish to ignore them.
*
* This option does not ignore documentation {@link graphql.language.Description}s.
*
* @return true if {@link graphql.language.Comment}s should be captured as AST nodes
*
* @see graphql.language.SourceLocation
*/
public boolean isCaptureLineComments() {
return captureLineComments;
}
/**
* A graphql hacking vector is to send nonsensical queries that burn lots of parsing CPU time and burn
* memory representing a document that won't ever execute. To prevent this you can set a maximum number of parse
* tokens that will be accepted before an exception is thrown and the parsing is stopped.
*
* @return the maximum number of raw tokens the parser will accept, after which an exception will be thrown.
*/
public int getMaxTokens() {
return maxTokens;
}
public ParsingListener getParsingListener() {
return parsingListener;
}
public ParserOptions transform(Consumer builderConsumer) {
Builder builder = new Builder(this);
builderConsumer.accept(builder);
return builder.build();
}
public static Builder newParserOptions() {
return new Builder();
}
public static class Builder {
private boolean captureIgnoredChars = false;
private boolean captureSourceLocation = true;
private boolean captureLineComments = true;
private int maxTokens = MAX_QUERY_TOKENS;
private ParsingListener parsingListener = ParsingListener.NOOP;
Builder() {
}
Builder(ParserOptions parserOptions) {
this.captureIgnoredChars = parserOptions.captureIgnoredChars;
this.captureSourceLocation = parserOptions.captureSourceLocation;
this.captureLineComments = parserOptions.captureLineComments;
this.maxTokens = parserOptions.maxTokens;
this.parsingListener = parserOptions.parsingListener;
}
public Builder captureIgnoredChars(boolean captureIgnoredChars) {
this.captureIgnoredChars = captureIgnoredChars;
return this;
}
public Builder captureSourceLocation(boolean captureSourceLocation) {
this.captureSourceLocation = captureSourceLocation;
return this;
}
public Builder captureLineComments(boolean captureLineComments) {
this.captureLineComments = captureLineComments;
return this;
}
public Builder maxTokens(int maxTokens) {
this.maxTokens = maxTokens;
return this;
}
public Builder parsingListener(ParsingListener parsingListener) {
this.parsingListener = assertNotNull(parsingListener);
return this;
}
public ParserOptions build() {
return new ParserOptions(this);
}
}
}