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DefaultJsonSerializer.cs
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DefaultJsonSerializer.cs
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//
// Copyright (c) 2004-2021 Jaroslaw Kowalski <jaak@jkowalski.net>, Kim Christensen, Julian Verdurmen
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// * Neither the name of Jaroslaw Kowalski nor the names of its
// contributors may be used to endorse or promote products derived from this
// software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
//
using System;
using System.Collections;
using System.Collections.Generic;
using System.Globalization;
using System.Text;
using NLog.Internal;
namespace NLog.Targets
{
/// <summary>
/// Default class for serialization of values to JSON format.
/// </summary>
public class DefaultJsonSerializer : IJsonConverter
{
private readonly ObjectReflectionCache _objectReflectionCache;
private readonly MruCache<Enum, string> _enumCache = new MruCache<Enum, string>(2000);
private const int MaxJsonLength = 512 * 1024;
private static readonly IEqualityComparer<object> _referenceEqualsComparer = SingleItemOptimizedHashSet<object>.ReferenceEqualityComparer.Default;
private static JsonSerializeOptions DefaultSerializerOptions = new JsonSerializeOptions();
private static JsonSerializeOptions DefaultExceptionSerializerOptions = new JsonSerializeOptions() { SanitizeDictionaryKeys = true };
/// <summary>
/// Singleton instance of the serializer.
/// </summary>
[Obsolete("Instead use LogFactory.ServiceRepository.ResolveInstance(typeof(IJsonConverter)). Marked obsolete on NLog 5.0")]
public static DefaultJsonSerializer Instance { get; } = new DefaultJsonSerializer(null);
/// <summary>
/// Private. Use <see cref="Instance"/>
/// </summary>
internal DefaultJsonSerializer(IServiceProvider serviceProvider)
{
_objectReflectionCache = new ObjectReflectionCache(serviceProvider);
}
/// <summary>
/// Returns a serialization of an object into JSON format.
/// </summary>
/// <param name="value">The object to serialize to JSON.</param>
/// <returns>Serialized value.</returns>
public string SerializeObject(object value)
{
return SerializeObject(value, DefaultSerializerOptions);
}
/// <summary>
/// Returns a serialization of an object into JSON format.
/// </summary>
/// <param name="value">The object to serialize to JSON.</param>
/// <param name="options">serialisation options</param>
/// <returns>Serialized value.</returns>
public string SerializeObject(object value, JsonSerializeOptions options)
{
if (value is null)
{
return "null";
}
else if (value is string str)
{
for (int i = 0; i < str.Length; ++i)
{
if (RequiresJsonEscape(str[i], options))
{
StringBuilder sb = new StringBuilder(str.Length + 4);
sb.Append('"');
AppendStringEscape(sb, str, options);
sb.Append('"');
return sb.ToString();
}
}
return QuoteValue(str);
}
else
{
IConvertible convertibleValue = value as IConvertible;
TypeCode objTypeCode = convertibleValue?.GetTypeCode() ?? TypeCode.Object;
if (objTypeCode != TypeCode.Object && objTypeCode != TypeCode.Char)
{
Enum enumValue;
if (!options.EnumAsInteger && IsNumericTypeCode(objTypeCode, false) && (enumValue = value as Enum) != null)
{
return QuoteValue(EnumAsString(enumValue));
}
else
{
string xmlStr = XmlHelper.XmlConvertToString(convertibleValue, objTypeCode);
if (SkipQuotes(convertibleValue, objTypeCode))
{
return xmlStr;
}
else
{
return QuoteValue(xmlStr);
}
}
}
else
{
StringBuilder sb = new StringBuilder();
if (!SerializeObject(value, sb, options))
{
return null;
}
return sb.ToString();
}
}
}
/// <summary>
/// Serialization of the object in JSON format to the destination StringBuilder
/// </summary>
/// <param name="value">The object to serialize to JSON.</param>
/// <param name="destination">Write the resulting JSON to this destination.</param>
/// <returns>Object serialized successfully (true/false).</returns>
public bool SerializeObject(object value, StringBuilder destination)
{
return SerializeObject(value, destination, DefaultSerializerOptions);
}
/// <summary>
/// Serialization of the object in JSON format to the destination StringBuilder
/// </summary>
/// <param name="value">The object to serialize to JSON.</param>
/// <param name="destination">Write the resulting JSON to this destination.</param>
/// <param name="options">serialisation options</param>
/// <returns>Object serialized successfully (true/false).</returns>
public bool SerializeObject(object value, StringBuilder destination, JsonSerializeOptions options)
{
return SerializeObject(value, destination, options, default(SingleItemOptimizedHashSet<object>), 0);
}
/// <summary>
/// Serialization of the object in JSON format to the destination StringBuilder
/// </summary>
/// <param name="value">The object to serialize to JSON.</param>
/// <param name="destination">Write the resulting JSON to this destination.</param>
/// <param name="options">serialisation options</param>
/// <param name="objectsInPath">The objects in path (Avoid cyclic reference loop).</param>
/// <param name="depth">The current depth (level) of recursion.</param>
/// <returns>Object serialized successfully (true/false).</returns>
private bool SerializeObject(object value, StringBuilder destination, JsonSerializeOptions options, SingleItemOptimizedHashSet<object> objectsInPath, int depth)
{
int originalLength = destination.Length;
try
{
if (SerializeSimpleObjectValue(value, destination, options))
{
return true;
}
return SerializeObjectWithReflection(value, destination, options, ref objectsInPath, depth);
}
catch
{
destination.Length = originalLength;
return false;
}
}
private bool SerializeObjectWithReflection(object value, StringBuilder destination, JsonSerializeOptions options, ref SingleItemOptimizedHashSet<object> objectsInPath, int depth)
{
int originalLength = destination.Length;
if (originalLength > MaxJsonLength)
{
return false;
}
if (objectsInPath.Contains(value))
{
return false;
}
if (value is IDictionary dict)
{
using (StartCollectionScope(ref objectsInPath, dict))
{
SerializeDictionaryObject(dict, destination, options, objectsInPath, depth);
return true;
}
}
if (value is IEnumerable enumerable)
{
if (_objectReflectionCache.TryLookupExpandoObject(value, out var objectPropertyList))
{
return SerializeObjectPropertyList(value, ref objectPropertyList, destination, options, ref objectsInPath, depth);
}
else
{
using (StartCollectionScope(ref objectsInPath, value))
{
SerializeCollectionObject(enumerable, destination, options, objectsInPath, depth);
return true;
}
}
}
else
{
var objectPropertyList = _objectReflectionCache.LookupObjectProperties(value);
return SerializeObjectPropertyList(value, ref objectPropertyList, destination, options, ref objectsInPath, depth);
}
}
private bool SerializeSimpleObjectValue(object value, StringBuilder destination, JsonSerializeOptions options, bool forceToString = false)
{
var convertibleValue = value as IConvertible;
var objTypeCode = convertibleValue?.GetTypeCode() ?? (value is null ? TypeCode.Empty : TypeCode.Object);
if (objTypeCode != TypeCode.Object)
{
SerializeSimpleTypeCodeValue(convertibleValue, objTypeCode, destination, options, forceToString);
return true;
}
if (value is DateTimeOffset dateTimeOffset)
{
QuoteValue(destination, dateTimeOffset.ToString("yyyy-MM-dd HH:mm:ss zzz", CultureInfo.InvariantCulture));
return true;
}
if (value is IFormattable formattable)
{
SerializeWithFormatProvider(formattable, destination, options);
return true;
}
return false; // Not simple
}
private static SingleItemOptimizedHashSet<object>.SingleItemScopedInsert StartCollectionScope(ref SingleItemOptimizedHashSet<object> objectsInPath, object value)
{
return new SingleItemOptimizedHashSet<object>.SingleItemScopedInsert(value, ref objectsInPath, true, _referenceEqualsComparer);
}
private void SerializeWithFormatProvider(IFormattable formattable, StringBuilder destination, JsonSerializeOptions options)
{
var str = formattable.ToString(null, CultureInfo.InvariantCulture);
destination.Append('"');
AppendStringEscape(destination, str, options);
destination.Append('"');
}
private void SerializeDictionaryObject(IDictionary dictionary, StringBuilder destination, JsonSerializeOptions options, SingleItemOptimizedHashSet<object> objectsInPath, int depth)
{
bool first = true;
int nextDepth = objectsInPath.Count <= 1 ? depth : (depth + 1);
if (nextDepth > options.MaxRecursionLimit)
{
destination.Append("{}");
return;
}
destination.Append('{');
foreach (var item in new DictionaryEntryEnumerable(dictionary))
{
var originalLength = destination.Length;
if (originalLength > MaxJsonLength)
{
break;
}
if (!first)
{
destination.Append(',');
}
var itemKey = item.Key;
if (!SerializeObjectAsString(itemKey, destination, options))
{
destination.Length = originalLength;
continue;
}
if (options.SanitizeDictionaryKeys)
{
int keyEndIndex = destination.Length - 1;
int keyStartIndex = originalLength + (first ? 0 : 1) + 1;
if (!SanitizeDictionaryKey(destination, keyStartIndex, keyEndIndex - keyStartIndex))
{
destination.Length = originalLength; // Empty keys are not allowed
continue;
}
}
destination.Append(':');
//only serialize, if key and value are serialized without error (e.g. due to reference loop)
var itemValue = item.Value;
if (!SerializeObject(itemValue, destination, options, objectsInPath, nextDepth))
{
destination.Length = originalLength;
}
else
{
first = false;
}
}
destination.Append('}');
}
private static bool SanitizeDictionaryKey(StringBuilder destination, int keyStartIndex, int keyLength)
{
if (keyLength == 0)
{
return false; // Empty keys are not allowed
}
int keyEndIndex = keyStartIndex + keyLength;
for (int i = keyStartIndex; i < keyEndIndex; ++i)
{
char keyChar = destination[i];
if (keyChar == '_' || char.IsLetterOrDigit(keyChar))
continue;
destination[i] = '_';
}
return true;
}
private void SerializeCollectionObject(IEnumerable value, StringBuilder destination, JsonSerializeOptions options, SingleItemOptimizedHashSet<object> objectsInPath, int depth)
{
bool first = true;
int nextDepth = objectsInPath.Count <= 1 ? depth : (depth + 1); // Allow serialization of list-items
if (nextDepth > options.MaxRecursionLimit)
{
destination.Append("[]");
return;
}
int originalLength;
destination.Append('[');
foreach (var val in value)
{
originalLength = destination.Length;
if (originalLength > MaxJsonLength)
{
break;
}
if (!first)
{
destination.Append(',');
}
if (!SerializeObject(val, destination, options, objectsInPath, nextDepth))
{
destination.Length = originalLength;
}
else
{
first = false;
}
}
destination.Append(']');
}
private bool SerializeObjectPropertyList(object value, ref ObjectReflectionCache.ObjectPropertyList objectPropertyList, StringBuilder destination, JsonSerializeOptions options, ref SingleItemOptimizedHashSet<object> objectsInPath, int depth)
{
if (objectPropertyList.IsSimpleValue)
{
value = objectPropertyList.ObjectValue;
if (SerializeSimpleObjectValue(value, destination, options))
{
return true;
}
}
else if (depth < options.MaxRecursionLimit)
{
if (ReferenceEquals(options, DefaultSerializerOptions) && value is Exception)
{
// Exceptions are seldom under control, and can include random Data-Dictionary-keys, so we sanitize by default
options = DefaultExceptionSerializerOptions;
}
using (new SingleItemOptimizedHashSet<object>.SingleItemScopedInsert(value, ref objectsInPath, false, _referenceEqualsComparer))
{
return SerializeObjectProperties(objectPropertyList, destination, options, objectsInPath, depth);
}
}
return SerializeObjectAsString(value, destination, options);
}
private void SerializeSimpleTypeCodeValue(IConvertible value, TypeCode objTypeCode, StringBuilder destination, JsonSerializeOptions options, bool forceToString = false)
{
if (objTypeCode == TypeCode.Empty || value is null)
{
destination.Append(forceToString ? "\"\"" : "null");
}
else if (objTypeCode == TypeCode.String || objTypeCode == TypeCode.Char)
{
destination.Append('"');
AppendStringEscape(destination, value.ToString(), options);
destination.Append('"');
}
else
{
SerializeSimpleTypeCodeValueNoEscape(value, objTypeCode, destination, options, forceToString);
}
}
private void SerializeSimpleTypeCodeValueNoEscape(IConvertible value, TypeCode objTypeCode, StringBuilder destination, JsonSerializeOptions options, bool forceToString)
{
if (IsNumericTypeCode(objTypeCode, false))
{
if (!options.EnumAsInteger && value is Enum enumValue)
{
QuoteValue(destination, EnumAsString(enumValue));
}
else
{
SerializeNumericValue(value, objTypeCode, destination, forceToString);
}
}
else if (objTypeCode == TypeCode.DateTime)
{
destination.Append('"');
destination.AppendXmlDateTimeRoundTrip(value.ToDateTime(CultureInfo.InvariantCulture));
destination.Append('"');
}
else if (IsNumericTypeCode(objTypeCode, true) && SkipQuotes(value, objTypeCode))
{
SerializeNumericValue(value, objTypeCode, destination, forceToString);
}
else
{
string str = XmlHelper.XmlConvertToString(value, objTypeCode);
if (!forceToString && !string.IsNullOrEmpty(str) && SkipQuotes(value, objTypeCode))
{
destination.Append(str);
}
else
{
QuoteValue(destination, str);
}
}
}
private void SerializeNumericValue(IConvertible value, TypeCode objTypeCode, StringBuilder destination, bool forceToString)
{
if (forceToString)
destination.Append('"');
destination.AppendNumericInvariant(value, objTypeCode);
if (forceToString)
destination.Append('"');
}
private static string QuoteValue(string value)
{
return string.Concat("\"", value, "\"");
}
private static void QuoteValue(StringBuilder destination, string value)
{
destination.Append('"');
destination.Append(value);
destination.Append('"');
}
private string EnumAsString(Enum value)
{
string textValue;
if (!_enumCache.TryGetValue(value, out textValue))
{
textValue = Convert.ToString(value, CultureInfo.InvariantCulture);
_enumCache.TryAddValue(value, textValue);
}
return textValue;
}
/// <summary>
/// No quotes needed for this type?
/// </summary>
private static bool SkipQuotes(IConvertible value, TypeCode objTypeCode)
{
switch (objTypeCode)
{
case TypeCode.String: return false;
case TypeCode.Char: return false;
case TypeCode.DateTime: return false;
case TypeCode.Empty: return true;
case TypeCode.Boolean: return true;
case TypeCode.Decimal: return true;
case TypeCode.Double:
{
double dblValue = value.ToDouble(CultureInfo.InvariantCulture);
return !double.IsNaN(dblValue) && !double.IsInfinity(dblValue);
}
case TypeCode.Single:
{
float floatValue = value.ToSingle(CultureInfo.InvariantCulture);
return !float.IsNaN(floatValue) && !float.IsInfinity(floatValue);
}
default:
return IsNumericTypeCode(objTypeCode, false);
}
}
/// <summary>
/// Checks the object <see cref="TypeCode" /> if it is numeric
/// </summary>
/// <param name="objTypeCode">TypeCode for the object</param>
/// <param name="includeDecimals">Accept fractional types as numeric type.</param>
/// <returns></returns>
private static bool IsNumericTypeCode(TypeCode objTypeCode, bool includeDecimals)
{
switch (objTypeCode)
{
case TypeCode.Byte:
case TypeCode.SByte:
case TypeCode.Int16:
case TypeCode.Int32:
case TypeCode.Int64:
case TypeCode.UInt16:
case TypeCode.UInt32:
case TypeCode.UInt64:
return true;
case TypeCode.Single:
case TypeCode.Double:
case TypeCode.Decimal:
return includeDecimals;
}
return false;
}
/// <summary>
/// Checks input string if it needs JSON escaping, and makes necessary conversion
/// </summary>
/// <param name="destination">Destination Builder</param>
/// <param name="text">Input string</param>
/// <param name="options">all options</param>
/// <returns>JSON escaped string</returns>
private static void AppendStringEscape(StringBuilder destination, string text, JsonSerializeOptions options)
{
AppendStringEscape(destination, text, options.EscapeUnicode, options.EscapeForwardSlash);
}
/// <summary>
/// Checks input string if it needs JSON escaping, and makes necessary conversion
/// </summary>
/// <param name="destination">Destination Builder</param>
/// <param name="text">Input string</param>
/// <param name="escapeUnicode">Should non-ascii characters be encoded</param>
/// <param name="escapeForwardSlash"></param>
/// <returns>JSON escaped string</returns>
internal static void AppendStringEscape(StringBuilder destination, string text, bool escapeUnicode, bool escapeForwardSlash)
{
if (string.IsNullOrEmpty(text))
return;
StringBuilder sb = null;
for (int i = 0; i < text.Length; ++i)
{
char ch = text[i];
if (!RequiresJsonEscape(ch, escapeUnicode, escapeForwardSlash))
{
sb?.Append(ch);
continue;
}
else if (sb is null)
{
sb = destination;
sb.Append(text, 0, i);
}
switch (ch)
{
case '"':
sb.Append("\\\"");
break;
case '\\':
sb.Append("\\\\");
break;
case '\b':
sb.Append("\\b");
break;
case '/':
if (escapeForwardSlash)
{
sb.Append("\\/");
}
else
{
sb.Append(ch);
}
break;
case '\r':
sb.Append("\\r");
break;
case '\n':
sb.Append("\\n");
break;
case '\f':
sb.Append("\\f");
break;
case '\t':
sb.Append("\\t");
break;
default:
if (EscapeChar(ch, escapeUnicode))
{
sb.AppendFormat(CultureInfo.InvariantCulture, "\\u{0:x4}", (int)ch);
}
else
{
sb.Append(ch);
}
break;
}
}
if (sb is null)
destination.Append(text); // Faster to make single Append
}
internal static void PerformJsonEscapeWhenNeeded(StringBuilder builder, int startPos, bool escapeUnicode, bool escapeForwardSlash)
{
for (int i = startPos; i < builder.Length; ++i)
{
if (RequiresJsonEscape(builder[i], escapeUnicode, escapeForwardSlash))
{
var str = builder.ToString(startPos, builder.Length - startPos);
builder.Length = startPos;
Targets.DefaultJsonSerializer.AppendStringEscape(builder, str, escapeUnicode, escapeForwardSlash);
break;
}
}
}
internal static bool RequiresJsonEscape(char ch, JsonSerializeOptions options)
{
return RequiresJsonEscape(ch, options.EscapeUnicode, options.EscapeForwardSlash);
}
internal static bool RequiresJsonEscape(char ch, bool escapeUnicode, bool escapeForwardSlash)
{
if (!EscapeChar(ch, escapeUnicode))
{
switch (ch)
{
case '/': return escapeForwardSlash;
case '"':
case '\\':
return true;
default:
return false;
}
}
return true;
}
private static bool EscapeChar(char ch, bool escapeUnicode)
{
if (ch < 32)
return true;
else
return escapeUnicode && ch > 127;
}
private bool SerializeObjectProperties(ObjectReflectionCache.ObjectPropertyList objectPropertyList, StringBuilder destination, JsonSerializeOptions options,
SingleItemOptimizedHashSet<object> objectsInPath, int depth)
{
destination.Append('{');
bool first = true;
foreach (var propertyValue in objectPropertyList)
{
var originalLength = destination.Length;
try
{
if (!propertyValue.HasNameAndValue)
continue;
if (!first)
{
destination.Append(", ");
}
QuoteValue(destination, propertyValue.Name);
destination.Append(':');
var objTypeCode = propertyValue.TypeCode;
if (objTypeCode != TypeCode.Object)
{
SerializeSimpleTypeCodeValue((IConvertible)propertyValue.Value, objTypeCode, destination, options);
first = false;
}
else
{
if (!SerializeObject(propertyValue.Value, destination, options, objectsInPath, depth + 1))
{
destination.Length = originalLength;
}
else
{
first = false;
}
}
}
catch
{
// skip single property
destination.Length = originalLength;
}
}
destination.Append('}');
return true;
}
private bool SerializeObjectAsString(object value, StringBuilder destination, JsonSerializeOptions options)
{
var originalLength = destination.Length;
try
{
if (SerializeSimpleObjectValue(value, destination, options, true))
{
return true;
}
var str = Convert.ToString(value, CultureInfo.InvariantCulture);
destination.Append('"');
AppendStringEscape(destination, str, options);
destination.Append('"');
return true;
}
catch
{
// skip bad object
destination.Length = originalLength;
return false;
}
}
}
}