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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) [2021-2023] Payara Foundation and/or its affiliates. All rights reserved.
*
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* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://github.com/payara/Payara/blob/master/LICENSE.txt
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* file and include the License file at glassfish/legal/LICENSE.txt.
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package fish.payara.nucleus.microprofile.config.spi;
import fish.payara.nucleus.microprofile.config.util.ConfigValueType;
import org.eclipse.microprofile.config.spi.ConfigSource;
import org.glassfish.config.support.TranslatedConfigView;
import java.util.HashSet;
import java.util.NoSuchElementException;
import java.util.Set;
import org.jboss.logging.Logger;
final class ConfigExpressionResolver {
private static final Logger log = Logger.getLogger(ConfigExpressionResolver.class);
private final Iterable sources;
private final boolean expansionEnabled;
private final Set resolvingExpressions;
private final String profile;
protected ConfigExpressionResolver(Iterable sources) {
this(sources, true, null);
}
protected ConfigExpressionResolver(Iterable sources, String profile) {
this(sources, true, profile);
}
protected ConfigExpressionResolver(Iterable sources, boolean expansionEnabled) {
this(sources, expansionEnabled, null);
}
protected ConfigExpressionResolver(Iterable sources, boolean expansionEnabled, String profile) {
this.sources = sources;
this.expansionEnabled = expansionEnabled;
this.resolvingExpressions = new HashSet<>();
this.profile = profile;
}
protected ConfigValueImpl resolve(String propertyName) {
return resolve(propertyName, null, ConfigValueType.NORMAL);
}
protected ConfigValueImpl resolve(String propertyName, String propertyDefault) {
return resolve(propertyName, propertyDefault, ConfigValueType.NORMAL);
}
protected ConfigValueImpl resolve(String propertyName, String propertyDefault, ConfigValueType type) {
return resolve(propertyName, propertyDefault, false, type);
}
private ConfigValueImpl resolve(String propertyName, String propertyDefault, boolean resolveDefault, ConfigValueType type) {
String translated = TranslatedConfigView.expandConfigValue(propertyName);
if (!translated.equals(propertyName)) {
return new ConfigValueImpl(
propertyName,
translated,
resolveExpression(translated),
"TranslatedConfigView",
0
);
}
String profiledPropertyName = resolveExpression((profile == null ? "" : "%" + profile + ".") + propertyName);
ConfigValueImpl result = getValue(profiledPropertyName);
if(profile != null && result != null) {
ConfigValueImpl resultWithoutProfile = getValue(resolveExpression(propertyName));
result = resultWithoutProfile.getSourceOrdinal() == result.getSourceOrdinal() ? result :
(resultWithoutProfile.getSourceOrdinal() > result.getSourceOrdinal()) ? resultWithoutProfile : result;
}
if (result == null) {
String resolvedPropertyName = resolveExpression(propertyName);
result = getValue(resolvedPropertyName);
}
if (result == null) {
result = new ConfigValueImpl(profiledPropertyName, propertyDefault,
resolveDefault ? resolveExpression(propertyDefault, type) : propertyDefault, null, 0);
}
return result;
}
private ConfigValueImpl getValue(String propertyName) {
for (ConfigSource source : sources) {
final String result = source.getValue(propertyName);
if (result != null && !result.isEmpty()) {
String resolvedExpression = null;
try {
resolvedExpression = resolveExpression(result);
} catch(NoSuchElementException noSuchElementException) {
log.warn(String.format("Using null value in configuration, expression %s", result));
}
return new ConfigValueImpl(
propertyName,
result,
resolvedExpression,
source.getName(),
source.getOrdinal()
);
}
}
return null;
}
private synchronized String resolveExpression(String expression) {
return resolveExpression(expression, ConfigValueType.NORMAL);
}
private synchronized String resolveExpression(String expression, ConfigValueType type) {
if (expression == null) {
return null;
}
if (!expansionEnabled) {
return expression;
}
if (resolvingExpressions.contains(expression)) {
throw new IllegalArgumentException("Infinitely recursive expression found within expression: " + expression);
}
String result = "";
try {
resolvingExpressions.add(expression);
final char[] characters = expression.toCharArray();
// These two variables store if the current character is part of
// an expression that will need resolving, and the contents of that expression.
// This essentially acts as a buffer that can be cleared when the expression is complete,
// then added to the result
boolean isExpression = false;
String expressionBuilder = "";
// These two variables perform a similar buffer function, but for the fallback if
// the above expression fails to be resolved
boolean isDefaultValue = false;
String expressionDefaultBuilder = "";
boolean defaultValueFound = false;
// Counts the depth of brackets, to help discern when an expression has actually ended
// I.e. without this variable, nested closing braces will cause the expression to close early
// this is the reason that RegEx can't be used
int bracketDepth = 0;
for (int i = 0; i < characters.length; i++) {
final char c = characters[i];
// Configure the context if expression markers are found
if (c == ':' && bracketDepth == 1) {
// Start building the default (only accept colons outside of any nested expressions)
isDefaultValue = true;
defaultValueFound = true;
continue;
} else if (bracketDepth == 0 && isExpressionStart(characters, i)) {
// Ignore starting $ symbols
continue;
} else if (isExpressionStart(characters, i - 1) && bracketDepth++ == 0) {
// Start the expression (only if the expression isn't nested)
isExpression = true;
continue;
} else if (isExpression && isExpressionEnd(characters, i) && bracketDepth-- == 1) {
// End the expression (only if the expression isn't nested)
isDefaultValue = false;
isExpression = false;
} else if (isCharacterEscaped(characters, i + 1) && !isCharacterEscaped(characters, i)) {
continue;
}
// React to the given character (given the previously calculated context)
if (isDefaultValue) {
expressionDefaultBuilder += c;
} else if (isExpression) {
expressionBuilder += c;
} else if (expressionBuilder.isEmpty()) {
result += c;
} else {
// If the expression has ended, resolve the expression
final String resolvedExpression = resolve(expressionBuilder, expressionDefaultBuilder, true, type).getValue();
// Clear the buffers
expressionBuilder = "";
expressionDefaultBuilder = "";
// Append the expression to the result, to continue processing the rest
if (resolvedExpression != null) {
result += resolvedExpression;
}
if ((result.isEmpty() && !defaultValueFound) && type == ConfigValueType.NORMAL) {
throw new NoSuchElementException("Unable to resolve expression " + expression);
}
}
}
} finally {
resolvingExpressions.remove(expression);
}
return result;
}
/**
* @param characters a array of characters
* @param index the index of the character to test
* @return if the character at the given index marks the '$' at the beginning of an expression
*/
private static boolean isExpressionStart(final char[] characters, final int index) {
return index >= 0
&& index + 1 < characters.length
&& characters[index] == '$'
&& characters[index + 1] == '{'
&& !isCharacterEscaped(characters, index);
}
/**
* @param characters an array of characters
* @param index the index of the character to test
* @return if the character at the given index marks the '}' to close an expression
*/
private static boolean isExpressionEnd(final char[] characters, final int index) {
return index >= 0
&& index < characters.length
&& characters[index] == '}'
&& !isCharacterEscaped(characters, index);
}
/**
* @param characters an array of characters
* @param index the index of the character to test
* @return if the character at the given index is escaped
*/
private static boolean isCharacterEscaped(final char[] characters, final int index) {
if (index == 0 || index >= characters.length) {
return false;
}
final char c = characters[index];
final boolean backslashFound = characters[index - 1] == '\\';
if (!backslashFound) {
return false;
}
// Only allow certain characters to be escaped. This is so that, for example, the array converter still receives
// the expected escape characters
switch (c) {
case '$':
case '{':
case '}':
return true;
default:
return false;
}
}
}
