private static IEnumerable <KeyValuePair <string, object> > ParseETagValue(IList <ResourceProperty> etagProperties, string ifMatchHeaderValue)
{
bool flag;
if (ifMatchHeaderValue == "*")
{
return(WebUtil.EmptyKeyValuePairStringObject);
}
string stringToUnescape = ifMatchHeaderValue.Substring("W/\"".Length, (ifMatchHeaderValue.Length - "W/\"".Length) - 1);
KeyInstance instance = null;
Exception innerException = null;
try
{
flag = KeyInstance.TryParseNullableTokens(Uri.UnescapeDataString(stringToUnescape), out instance);
}
catch (DataServiceException exception2)
{
flag = false;
innerException = exception2;
}
if (!flag)
{
throw DataServiceException.CreatePreConditionFailedError(System.Data.Services.Strings.Serializer_ETagValueDoesNotMatch, innerException);
}
if (instance.PositionalValues.Count != etagProperties.Count)
{
throw DataServiceException.CreatePreConditionFailedError(System.Data.Services.Strings.Serializer_ETagValueDoesNotMatch);
}
KeyValuePair <string, object>[] pairArray = new KeyValuePair <string, object> [etagProperties.Count];
for (int i = 0; i < pairArray.Length; i++)
{
ResourceProperty property = etagProperties[i];
object targetValue = null;
string text = (string)instance.PositionalValues[i];
if (text != "null")
{
try
{
flag = WebConvert.TryKeyStringToPrimitive(text, property.Type, out targetValue);
}
catch (OverflowException exception3)
{
flag = false;
innerException = exception3;
}
if (!flag)
{
throw DataServiceException.CreatePreConditionFailedError(System.Data.Services.Strings.Serializer_ETagValueDoesNotMatch, innerException);
}
}
pairArray[i] = new KeyValuePair <string, object>(etagProperties[i].Name, targetValue);
}
return(pairArray);
}
private void ApplyStandardPaging(string skipToken)
{
if (!string.IsNullOrEmpty(skipToken))
{
KeyInstance instance;
if (!this.IsPageSizeDefined)
{
throw DataServiceException.CreateBadRequestError(System.Data.Services.Strings.RequestQueryProcessor_SkipTokenSupportedOnPagedSets);
}
WebUtil.CheckSyntaxValid(KeyInstance.TryParseNullableTokens(skipToken, out instance));
if (this.topLevelOrderingInfo.OrderingExpressions.Count != instance.PositionalValues.Count)
{
throw DataServiceException.CreateBadRequestError(System.Data.Services.Strings.DataService_SDP_SkipTokenNotMatchingOrdering(instance.PositionalValues.Count, skipToken, this.topLevelOrderingInfo.OrderingExpressions.Count));
}
this.queryExpression = this.queryExpression.QueryableWhere(this.orderingParser.BuildSkipTokenFilter(this.topLevelOrderingInfo, instance));
this.description.VerifyProtocolVersion(RequestDescription.Version2Dot0, this.service);
this.description.VerifyRequestVersion(RequestDescription.Version2Dot0, this.service);
this.description.VerifyAndRaiseResponseVersion(RequestDescription.Version2Dot0, this.service);
}
}
private void ApplyCustomPaging(string skipToken)
{
if (!string.IsNullOrEmpty(skipToken))
{
KeyInstance instance;
WebUtil.CheckSyntaxValid(KeyInstance.TryParseNullableTokens(skipToken, out instance));
ParameterExpression parameterForIt = Expression.Parameter(this.description.LastSegmentInfo.TargetResourceType.InstanceType, "it");
RequestQueryParser.ExpressionParser parser = new RequestQueryParser.ExpressionParser(this.service, this.description, parameterForIt, string.Empty);
object[] skipTokenValues = new object[instance.PositionalValues.Count];
int num = 0;
foreach (object obj2 in instance.PositionalValues)
{
skipTokenValues[num++] = parser.ParseSkipTokenLiteral((string)obj2);
}
this.CheckAndApplyCustomPaging(skipTokenValues);
this.description.VerifyProtocolVersion(RequestDescription.Version2Dot0, this.service);
this.description.VerifyRequestVersion(RequestDescription.Version2Dot0, this.service);
}
else
{
this.CheckAndApplyCustomPaging(null);
}
}
/// <summary>Attempts to parse key values from the specified text.</summary>
/// <param name='text'>Text to parse (not null).</param>
/// <param name="allowNamedValues">Set to true if the parser should accept named values
/// so syntax like Name='value'. If this is false, the parsing will fail on such constructs.</param>
/// <param name="allowNull">Set to true if the parser should accept null values.
/// If set to false, the parser will fail on null values.</param>
/// <param name='instance'>After invocation, the parsed key instance.</param>
/// <returns>
/// true if the key instance was parsed; false if there was a
/// syntactic error.
/// </returns>
/// <remarks>
/// The returned instance contains only string values. To get typed values, a call to
/// <see cref="TryConvertValues"/> is necessary.
/// </remarks>
private static bool TryParseFromUri(string text, bool allowNamedValues, bool allowNull, out KeyInstance instance)
{
Debug.Assert(text != null, "text != null");
Dictionary<string, object> namedValues = null;
List<object> positionalValues = null;
ExpressionLexer lexer = new ExpressionLexer(text);
Token currentToken = lexer.CurrentToken;
if (currentToken.Id == TokenId.End)
{
instance = Empty;
return true;
}
instance = null;
do
{
if (currentToken.Id == TokenId.Identifier && allowNamedValues)
{
// Name-value pair.
if (positionalValues != null)
{
// We cannot mix named and non-named values.
return false;
}
string identifier = lexer.CurrentToken.GetIdentifier();
lexer.NextToken();
if (lexer.CurrentToken.Id != TokenId.Equal)
{
return false;
}
lexer.NextToken();
if (!lexer.CurrentToken.IsKeyValueToken)
{
return false;
}
string namedValue = lexer.CurrentToken.Text;
WebUtil.CreateIfNull(ref namedValues);
if (namedValues.ContainsKey(identifier))
{
// Duplicate name.
return false;
}
namedValues.Add(identifier, namedValue);
}
else if (currentToken.IsKeyValueToken || (allowNull && currentToken.Id == TokenId.NullLiteral))
{
// Positional value.
if (namedValues != null)
{
// We cannot mix named and non-named values.
return false;
}
WebUtil.CreateIfNull(ref positionalValues);
positionalValues.Add(lexer.CurrentToken.Text);
}
else
{
return false;
}
// Read the next token. We should be at the end, or find
// we have a comma followed by something.
lexer.NextToken();
currentToken = lexer.CurrentToken;
if (currentToken.Id == TokenId.Comma)
{
lexer.NextToken();
currentToken = lexer.CurrentToken;
if (currentToken.Id == TokenId.End)
{
// Trailing comma.
return false;
}
}
}
while (currentToken.Id != TokenId.End);
instance = new KeyInstance(namedValues, positionalValues);
return true;
}
/// <summary>Attempts to parse nullable values (only positional values, no name-value pairs) from the specified text.</summary>
/// <param name='text'>Text to parse (not null).</param>
/// <param name='instance'>After invocation, the parsed key instance.</param>
/// <returns>
/// true if the given values were parsed; false if there was a
/// syntactic error.
/// </returns>
/// <remarks>
/// The returned instance contains only string values. To get typed values, a call to
/// <see cref="TryConvertValues"/> is necessary.
/// </remarks>
internal static bool TryParseNullableTokens(string text, out KeyInstance instance)
{
return TryParseFromUri(text, false /*allowNamedValues*/, true /*allowNull*/, out instance);
}
/// <summary>
/// Parse the given etag value in the If-Match request header.
/// </summary>
/// <param name="etagProperties">List of etag properties for the type whose etag values we are parsing.</param>
/// <param name="ifMatchHeaderValue">value of the If-Match header as specified in the request.</param>
/// <returns>returns the etag value as a list containing the property name and its corresponding value. If the If-Match header value is '*', then returns an empty collection.</returns>
private static IEnumerable <KeyValuePair <string, object> > ParseETagValue(IList <ResourceProperty> etagProperties, string ifMatchHeaderValue)
{
Debug.Assert(etagProperties != null && etagProperties.Count != 0, "There must be atleast one etag property specified");
Debug.Assert(!String.IsNullOrEmpty(ifMatchHeaderValue), "IfMatch header cannot be null");
if (ifMatchHeaderValue == XmlConstants.HttpAnyETag)
{
// if the value is '*', then we return an empty IEnumerable.
return(new KeyValuePair <string, object> [0]);
}
Debug.Assert(ifMatchHeaderValue.StartsWith(XmlConstants.HttpWeakETagPrefix, StringComparison.Ordinal), "If-Match header must be properly formatted - this check is done in DataService.CheckETagValues method");
Debug.Assert(ifMatchHeaderValue.Length >= XmlConstants.HttpWeakETagPrefix.Length + 1, "If-Match header must be properly formatted - this check is done in DataService.CheckETagValues method");
// Just get the etag value - we need to ignore the 'W/"' and the last '"' character from the etag
string strippedETag = ifMatchHeaderValue.Substring(XmlConstants.HttpWeakETagPrefix.Length, ifMatchHeaderValue.Length - XmlConstants.HttpWeakETagPrefix.Length - 1);
KeyInstance keyInstance = null;
bool success;
Exception innerException = null;
// In V1, when we didn't have IConcurrencyProvider interface, we always used to compute the
// latest etag from the entity instance we got from IUpdatable.GetResource and then comparing
// it with the If-Match request header. Hence all invalid cases always used to throw
// DataServiceException with 412, since the etags didn't match.
// In V1.5, we have added the support for IConcurrencyProvider, which means we need to parse
// the etag values and parse it to the provider, if it has implement this interface. To avoid
// breaking changes, we need to catch all parsing errors and report them as 412 instead of 400
// to avoid it from becoming a breaking change.
try
{
success = KeyInstance.TryParseNullableTokens(Uri.UnescapeDataString(strippedETag), out keyInstance);
}
catch (DataServiceException e)
{
success = false;
innerException = e;
}
if (!success)
{
// We could have throwed BadRequest here since the etag value is not properly formattted. But since
// we used to do throw 412 in V1, keeping it that way to avoid breaking change.
throw DataServiceException.CreatePreConditionFailedError(Strings.Serializer_ETagValueDoesNotMatch, innerException);
}
if (keyInstance.PositionalValues.Count != etagProperties.Count)
{
// We could have throwed BadRequest here since the etag value is not properly formattted. But since
// we used to do throw 412 in V1, keeping it that way to avoid breaking change.
throw DataServiceException.CreatePreConditionFailedError(Strings.Serializer_ETagValueDoesNotMatch);
}
KeyValuePair <string, object>[] etagPropertyInfo = new KeyValuePair <string, object> [etagProperties.Count];
for (int i = 0; i < etagPropertyInfo.Length; i++)
{
ResourceProperty etagProperty = etagProperties[i];
object propertyValue = null;
string value = (string)keyInstance.PositionalValues[i];
if (value != XmlConstants.NullLiteralInETag)
{
// The reason we need to catch the Overflow Exception here is because of the Bug #679728.
// In V1, when we didn't have IConcurrencyProvider interface, we always used to compute the
// latest etag from the entity instance we got from IUpdatable.GetResource and then comparing
// it with the If-Match request header. Hence all invalid cases always used to throw
// DataServiceException with 412, since the etags didn't match.
// In V1.5, we have added the support for IConcurrencyProvider, which means we need to parse
// the etag values and parse it to the provider, if it has implement this interface. To avoid
// breaking changes, we need to catch all parsing errors and report them as 412 instead of 400
// to avoid it from becoming a breaking change.
try
{
success = System.Data.Services.Parsing.WebConvert.TryKeyStringToPrimitive(value, etagProperty.Type, out propertyValue);
}
catch (OverflowException e)
{
success = false;
innerException = e;
}
if (!success)
{
// We could have throwed BadRequest here since the etag value is not properly formattted. But since
// we used to do throw 412 in V1, keeping it that way to avoid breaking change.
throw DataServiceException.CreatePreConditionFailedError(Strings.Serializer_ETagValueDoesNotMatch, innerException);
}
}
etagPropertyInfo[i] = new KeyValuePair <string, object>(etagProperties[i].Name, propertyValue);
}
return(etagPropertyInfo);
}
private static Expression SelectResourceByKey(Expression queryExpression, ResourceType resourceType, KeyInstance key)
{
for (int i = 0; i < resourceType.KeyProperties.Count; i++)
{
Expression expression2;
ResourceProperty property = resourceType.KeyProperties[i];
object obj2 = key.AreValuesNamed ? key.NamedValues[property.Name] : key.PositionalValues[i];
ParameterExpression expression = Expression.Parameter(queryExpression.ElementType(), "element");
if (property.CanReflectOnInstanceTypeProperty)
{
expression2 = Expression.Property(expression, property.Name);
}
else
{
expression2 = Expression.Convert(Expression.Call(null, DataServiceProviderMethods.GetValueMethodInfo, expression, Expression.Constant(property)), property.Type);
}
LambdaExpression predicate = Expression.Lambda(Expression.Equal(expression2, Expression.Constant(obj2)), new ParameterExpression[] { expression });
queryExpression = queryExpression.QueryableWhere(predicate);
}
return queryExpression;
}
/// <summary>Attempts to parse key values from the specified text.</summary>
/// <param name='text'>Text to parse (not null).</param>
/// <param name="allowNamedValues">Set to true if the parser should accept named values
/// so syntax like Name='value'. If this is false, the parsing will fail on such constructs.</param>
/// <param name="allowNull">Set to true if the parser should accept null values.
/// If set to false, the parser will fail on null values.</param>
/// <param name='instance'>After invocation, the parsed key instance.</param>
/// <returns>
/// true if the key instance was parsed; false if there was a
/// syntactic error.
/// </returns>
/// <remarks>
/// The returned instance contains only string values. To get typed values, a call to
/// <see cref="TryConvertValues"/> is necessary.
/// </remarks>
private static bool TryParseFromUri(string text, bool allowNamedValues, bool allowNull, out KeyInstance instance)
{
Debug.Assert(text != null, "text != null");
Dictionary <string, object> namedValues = null;
List <object> positionalValues = null;
ExpressionLexer lexer = new ExpressionLexer(text);
Token currentToken = lexer.CurrentToken;
if (currentToken.Id == TokenId.End)
{
instance = Empty;
return(true);
}
instance = null;
do
{
if (currentToken.Id == TokenId.Identifier && allowNamedValues)
{
// Name-value pair.
if (positionalValues != null)
{
// We cannot mix named and non-named values.
return(false);
}
string identifier = lexer.CurrentToken.GetIdentifier();
lexer.NextToken();
if (lexer.CurrentToken.Id != TokenId.Equal)
{
return(false);
}
lexer.NextToken();
if (!lexer.CurrentToken.IsKeyValueToken)
{
return(false);
}
string namedValue = lexer.CurrentToken.Text;
WebUtil.CreateIfNull(ref namedValues);
if (namedValues.ContainsKey(identifier))
{
// Duplicate name.
return(false);
}
namedValues.Add(identifier, namedValue);
}
else if (currentToken.IsKeyValueToken || (allowNull && currentToken.Id == TokenId.NullLiteral))
{
// Positional value.
if (namedValues != null)
{
// We cannot mix named and non-named values.
return(false);
}
WebUtil.CreateIfNull(ref positionalValues);
positionalValues.Add(lexer.CurrentToken.Text);
}
else
{
return(false);
}
// Read the next token. We should be at the end, or find
// we have a comma followed by something.
lexer.NextToken();
currentToken = lexer.CurrentToken;
if (currentToken.Id == TokenId.Comma)
{
lexer.NextToken();
currentToken = lexer.CurrentToken;
if (currentToken.Id == TokenId.End)
{
// Trailing comma.
return(false);
}
}
}while (currentToken.Id != TokenId.End);
instance = new KeyInstance(namedValues, positionalValues);
return(true);
}
/// <summary>Attempts to parse nullable values (only positional values, no name-value pairs) from the specified text.</summary>
/// <param name='text'>Text to parse (not null).</param>
/// <param name='instance'>After invocation, the parsed key instance.</param>
/// <returns>
/// true if the given values were parsed; false if there was a
/// syntactic error.
/// </returns>
/// <remarks>
/// The returned instance contains only string values. To get typed values, a call to
/// <see cref="TryConvertValues"/> is necessary.
/// </remarks>
internal static bool TryParseNullableTokens(string text, out KeyInstance instance)
{
return(TryParseFromUri(text, false /*allowNamedValues*/, true /*allowNull*/, out instance));
}
private static bool TryParseFromUri(string text, bool allowNamedValues, bool allowNull, out KeyInstance instance)
{
Dictionary <string, object> dictionary = null;
List <object> list = null;
ExpressionLexer lexer = new ExpressionLexer(text);
Token currentToken = lexer.CurrentToken;
if (currentToken.Id == TokenId.End)
{
instance = Empty;
return(true);
}
instance = null;
do
{
if ((currentToken.Id == TokenId.Identifier) && allowNamedValues)
{
if (list != null)
{
return(false);
}
string identifier = lexer.CurrentToken.GetIdentifier();
lexer.NextToken();
if (lexer.CurrentToken.Id != TokenId.Equal)
{
return(false);
}
lexer.NextToken();
if (!lexer.CurrentToken.IsKeyValueToken)
{
return(false);
}
string str2 = lexer.CurrentToken.Text;
WebUtil.CreateIfNull <Dictionary <string, object> >(ref dictionary);
if (dictionary.ContainsKey(identifier))
{
return(false);
}
dictionary.Add(identifier, str2);
}
else
{
if (!currentToken.IsKeyValueToken && (!allowNull || (currentToken.Id != TokenId.NullLiteral)))
{
return(false);
}
if (dictionary != null)
{
return(false);
}
WebUtil.CreateIfNull <List <object> >(ref list);
list.Add(lexer.CurrentToken.Text);
}
lexer.NextToken();
currentToken = lexer.CurrentToken;
if (currentToken.Id == TokenId.Comma)
{
lexer.NextToken();
currentToken = lexer.CurrentToken;
if (currentToken.Id == TokenId.End)
{
return(false);
}
}
}while (currentToken.Id != TokenId.End);
instance = new KeyInstance(dictionary, list);
return(true);
}
internal static bool TryParseNullableTokens(string text, out KeyInstance instance)
{
return(TryParseFromUri(text, false, true, out instance));
}
internal static bool TryParseKeysFromUri(string text, out KeyInstance instance)
{
return(TryParseFromUri(text, true, false, out instance));
}
private static bool TryParseFromUri(string text, bool allowNamedValues, bool allowNull, out KeyInstance instance)
{
Dictionary<string, object> dictionary = null;
List<object> list = null;
ExpressionLexer lexer = new ExpressionLexer(text);
Token currentToken = lexer.CurrentToken;
if (currentToken.Id == TokenId.End)
{
instance = Empty;
return true;
}
instance = null;
do
{
if ((currentToken.Id == TokenId.Identifier) && allowNamedValues)
{
if (list != null)
{
return false;
}
string identifier = lexer.CurrentToken.GetIdentifier();
lexer.NextToken();
if (lexer.CurrentToken.Id != TokenId.Equal)
{
return false;
}
lexer.NextToken();
if (!lexer.CurrentToken.IsKeyValueToken)
{
return false;
}
string str2 = lexer.CurrentToken.Text;
WebUtil.CreateIfNull<Dictionary<string, object>>(ref dictionary);
if (dictionary.ContainsKey(identifier))
{
return false;
}
dictionary.Add(identifier, str2);
}
else
{
if (!currentToken.IsKeyValueToken && (!allowNull || (currentToken.Id != TokenId.NullLiteral)))
{
return false;
}
if (dictionary != null)
{
return false;
}
WebUtil.CreateIfNull<List<object>>(ref list);
list.Add(lexer.CurrentToken.Text);
}
lexer.NextToken();
currentToken = lexer.CurrentToken;
if (currentToken.Id == TokenId.Comma)
{
lexer.NextToken();
currentToken = lexer.CurrentToken;
if (currentToken.Id == TokenId.End)
{
return false;
}
}
}
while (currentToken.Id != TokenId.End);
instance = new KeyInstance(dictionary, list);
return true;
}
internal static bool TryParseNullableTokens(string text, out KeyInstance instance)
{
return TryParseFromUri(text, false, true, out instance);
}
internal static bool TryParseKeysFromUri(string text, out KeyInstance instance)
{
return TryParseFromUri(text, true, false, out instance);
}
