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This commit is contained in:
Sam Brannen
2022-01-12 17:36:48 +01:00
parent 3631d2f36e
commit 9e8b6feb54
2 changed files with 30 additions and 12 deletions
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27
spring-core/src/main/java/org/springframework/util/xml/XmlValidationModeDetector.java
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@@ -1,5 +1,5 @@
/*
* Copyright 2002-2020 the original author or authors.
* Copyright 2002-2022 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -58,7 +58,7 @@ public class XmlValidationModeDetector {
/**
* The token in a XML document that declares the DTD to use for validation
* The token in an XML document that declares the DTD to use for validation
* and thus that DTD validation is being used.
*/
private static final String DOCTYPE = "DOCTYPE";
@@ -82,13 +82,15 @@ public class XmlValidationModeDetector {
/**
* Detect the validation mode for the XML document in the supplied {@link InputStream}.
* Note that the supplied {@link InputStream} is closed by this method before returning.
* <p>Note that the supplied {@link InputStream} is closed by this method before returning.
* @param inputStream the InputStream to parse
* @throws IOException in case of I/O failure
* @see #VALIDATION_DTD
* @see #VALIDATION_XSD
*/
public int detectValidationMode(InputStream inputStream) throws IOException {
this.inComment = false;
// Peek into the file to look for DOCTYPE.
try (BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream))) {
boolean isDtdValidated = false;
@@ -125,9 +127,11 @@ public class XmlValidationModeDetector {
}
/**
* Does the supplied content contain an XML opening tag. If the parse state is currently
* in an XML comment then this method always returns false. It is expected that all comment
* tokens will have consumed for the supplied content before passing the remainder to this method.
* Determine if the supplied content contains an XML opening tag.
* <p>It is expected that all comment tokens will have been consumed for the
* supplied content before passing the remainder to this method. However, as
* a sanity check, if the parse state is currently in an XML comment this
* method always returns {@code false}.
*/
private boolean hasOpeningTag(String content) {
if (this.inComment) {
@@ -166,7 +170,7 @@ public class XmlValidationModeDetector {
}
/**
* Consume the next comment token, update the "inComment" flag
* Consume the next comment token, update the "inComment" flag,
* and return the remaining content.
*/
@Nullable
@@ -183,14 +187,19 @@ public class XmlValidationModeDetector {
return commentToken(line, START_COMMENT, true);
}
/**
* Try to consume the {@link #END_COMMENT} token.
* @see #commentToken(String, String, boolean)
*/
private int endComment(String line) {
return commentToken(line, END_COMMENT, false);
}
/**
* Try to consume the supplied token against the supplied content and update the
* in comment parse state to the supplied value. Returns the index into the content
* which is after the token or -1 if the token is not found.
* "in comment" parse state to the supplied value.
* <p>Returns the index into the content which is after the token or -1 if the
* token is not found.
*/
private int commentToken(String line, String token, boolean inCommentIfPresent) {
int index = line.indexOf(token);