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//---------------------------------------------------------------------
// <copyright file="RequestUriProcessor.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <summary>
// Provides a class capable of processing Astoria request Uris.
// </summary>
//
// @owner Microsoft
//---------------------------------------------------------------------
namespace System.Data.Services
{
#region Namespaces.
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data.Services.Client;
using System.Data.Services.Parsing;
using System.Data.Services.Providers;
using System.Diagnostics;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
#endregion Namespaces.
// Syntax for Astoria segments:
// segment ::= identifier [ query ]
// query ::= "(" key ")"
// key ::= keyvalue *["," keyvalue]
// keyvalue ::= *quotedvalue | *unquotedvalue
// quotedvalue ::= "'" *qvchar "'"
// qvchar ::= char-except-quote | "''"
// unquotedvalue ::= char
/// <summary>
/// Use this class to process a web data service request Uri.
/// </summary>
internal static class RequestUriProcessor
{
/// <summary>MethodInfo for the RequestUriProcessor.InvokeWhere method.</summary>
private static readonly MethodInfo InvokeWhereMethodInfo = typeof(RequestUriProcessor).GetMethod("InvokeWhere", BindingFlags.NonPublic | BindingFlags.Static);
/// <summary>Recursion limit on segment length.</summary>
private const int RecursionLimit = 100;
/// <summary>
/// Parses the request Uri that the host is exposing and returns
/// information about the intended results.
/// </summary>
/// <param name="absoluteRequestUri">Request uri that needs to get processed.</param>
/// <param name="service">Data service for which the request is being processed.</param>
/// <returns>
/// An initialized RequestDescription instance describing what the
/// request is for.
/// </returns>
/// <exception cref="DataServiceException">
/// A <see cref="DataServiceException" /> with status code 404 (Not Found) is returned if an identifier
/// in a segment cannot be resolved; 400 (Bad Request) is returned if a syntax
/// error is found when processing a restriction (parenthesized text) or
/// in the query portion.
/// </exception>
/// <remarks>
/// Very important: no rights are checked on the last segment of the request.
/// </remarks>
internal static RequestDescription ProcessRequestUri(Uri absoluteRequestUri, IDataService service)
{
Debug.Assert(service != null, "service != null");
Debug.Assert(absoluteRequestUri != null, "absoluteRequestUri != null");
Debug.Assert(absoluteRequestUri.IsAbsoluteUri, "absoluteRequestUri.IsAbsoluteUri(" + absoluteRequestUri + ")");
string[] segments = EnumerateSegments(absoluteRequestUri, service.OperationContext.AbsoluteServiceUri);
if (segments.Length > RecursionLimit)
{
throw DataServiceException.CreateBadRequestError(Strings.RequestUriProcessor_TooManySegments);
}
SegmentInfo[] segmentInfos = CreateSegments(segments, service);
SegmentInfo lastSegment = (segmentInfos.Length == 0) ? null : segmentInfos[segmentInfos.Length - 1];
RequestTargetKind targetKind = (lastSegment == null) ? RequestTargetKind.ServiceDirectory : lastSegment.TargetKind;
// Create a ResultDescription from the processed segments.
RequestDescription resultDescription;
Uri resultUri = GetResultUri(service.OperationContext);
if (targetKind == RequestTargetKind.Metadata ||
targetKind == RequestTargetKind.Batch ||
targetKind == RequestTargetKind.ServiceDirectory)
{
resultDescription = new RequestDescription(targetKind, RequestTargetSource.None, resultUri);
}
else if (targetKind == RequestTargetKind.VoidServiceOperation)
{
Debug.Assert(lastSegment != null, "lastSegment != null");
Debug.Assert(lastSegment.TargetSource == RequestTargetSource.ServiceOperation, "targetSource == RequestTargetSource.ServiceOperation");
service.Provider.InvokeServiceOperation(lastSegment.Operation, lastSegment.OperationParameters);
resultDescription = new RequestDescription(
RequestTargetKind.VoidServiceOperation, // targetKind
RequestTargetSource.ServiceOperation, // targetSource
resultUri); // resultUri
}
else
{
Debug.Assert(lastSegment != null, "lastSegment != null");
Debug.Assert(
targetKind == RequestTargetKind.ComplexObject ||
targetKind == RequestTargetKind.OpenProperty ||
targetKind == RequestTargetKind.OpenPropertyValue ||
targetKind == RequestTargetKind.Primitive ||
targetKind == RequestTargetKind.PrimitiveValue ||
targetKind == RequestTargetKind.Resource ||
targetKind == RequestTargetKind.MediaResource,
"Known targetKind " + targetKind);
RequestTargetSource targetSource = lastSegment.TargetSource;
ResourceProperty projectedProperty = lastSegment.ProjectedProperty;
string containerName =
(lastSegment.TargetKind != RequestTargetKind.PrimitiveValue &&
lastSegment.TargetKind != RequestTargetKind.OpenPropertyValue &&
lastSegment.TargetKind != RequestTargetKind.MediaResource) ?
lastSegment.Identifier :
segmentInfos[segmentInfos.Length - 2].Identifier;
bool usesContainerName =
(targetSource == RequestTargetSource.Property &&
projectedProperty != null &&
projectedProperty.Kind != ResourcePropertyKind.ResourceSetReference) ||
(targetSource == RequestTargetSource.ServiceOperation &&
lastSegment.Operation.ResultKind == ServiceOperationResultKind.QueryWithSingleResult);
string mimeType =
(targetSource == RequestTargetSource.Property && projectedProperty != null) ? projectedProperty.MimeType :
(targetSource == RequestTargetSource.ServiceOperation) ? lastSegment.Operation.MimeType :
null;
RequestQueryCountOption countOption =
lastSegment.Identifier == XmlConstants.UriCountSegment ?
RequestQueryCountOption.ValueOnly :
RequestQueryCountOption.None;
// Throw if $count and $inlinecount requests have been disabled by the user
if (countOption != RequestQueryCountOption.None && !service.Configuration.DataServiceBehavior.AcceptCountRequests)
{
throw DataServiceException.CreateBadRequestError(Strings.DataServiceConfiguration_CountNotSupportedInV1Server);
}
resultDescription = new RequestDescription(
segmentInfos,
containerName,
usesContainerName,
mimeType,
resultUri)
{
CountOption = lastSegment.Identifier == XmlConstants.UriCountSegment ? RequestQueryCountOption.ValueOnly : RequestQueryCountOption.None
};
// Update the feature version if the target set contains any type with FF KeepInContent=false.
resultDescription.UpdateAndCheckEpmFeatureVersion(service);
// Update the response DSV for GET if the target set contains any type with FF KeepInContent=false.
//
// Note the response DSV is payload specific and since for GET we won't know if the instances to be
// serialized will contain any properties with FF KeepInContent=false until serialization time which
// happens after the headers are written, the best we can do is to determin this at the set level.
//
// For CUD operations we'll raise the version based on the actual instances at deserialization time.
if (service.OperationContext.Host.AstoriaHttpVerb == AstoriaVerbs.GET)
{
resultDescription.UpdateEpmResponseVersion(service.OperationContext.Host.RequestAccept, service.Provider);
}
}
// Process query options ($filter, $orderby, $expand, etc.)
resultDescription = RequestQueryProcessor.ProcessQuery(service, resultDescription);
// $count, $inlinecount and $select are 2.0 features - raise the max version of used features accordingly
if (resultDescription.CountOption != RequestQueryCountOption.None ||
(resultDescription.RootProjectionNode != null && resultDescription.RootProjectionNode.ProjectionsSpecified))
{
resultDescription.RaiseFeatureVersion(2, 0, service.Configuration);
}
return resultDescription;
}
/// <summary>Appends a segment with the specified escaped <paramref name='text' />.</summary>
/// <param name='uri'>URI to append to.</param>
/// <param name='text'>Segment text, already escaped.</param>
/// <returns>A new URI with a new segment escaped.</returns>
internal static Uri AppendEscapedSegment(Uri uri, string text)
{
Debug.Assert(uri != null, "uri != null");
Debug.Assert(text != null, "text != null");
UriBuilder builder = new UriBuilder(uri);
if (!builder.Path.EndsWith("/", StringComparison.Ordinal))
{
builder.Path += "/";
}
builder.Path += text;
return builder.Uri;
}
/// <summary>Appends a segment with the specified unescaped <paramref name='text' />.</summary>
/// <param name='uri'>URI to append to.</param>
/// <param name='text'>Segment text, already escaped.</param>
/// <returns>A new URI with a new segment escaped.</returns>
internal static Uri AppendUnescapedSegment(Uri uri, string text)
{
Debug.Assert(uri != null, "uri != null");
Debug.Assert(text != null, "text != null");
return AppendEscapedSegment(uri, Uri.EscapeDataString(text));
}
/// <summary>Gets the absolute URI that a reference (typically from a POST or PUT body) points to.</summary>
/// <param name="reference">Textual, URI-encoded reference.</param>
/// <param name="operationContext">Context for current operation.</param>
/// <returns>The absolute URI that <paramref name="reference"/> resolves to.</returns>
internal static Uri GetAbsoluteUriFromReference(string reference, DataServiceOperationContext operationContext)
{
return GetAbsoluteUriFromReference(reference, operationContext.AbsoluteServiceUri);
}
/// <summary>Gets the absolute URI that a reference (typically from a POST or PUT body) points to.</summary>
/// <param name="reference">Textual, URI-encoded reference.</param>
/// <param name="absoluteServiceUri">Absolure URI for service, used to validate that the URI points within.</param>
/// <returns>The absolute URI that <paramref name="reference"/> resolves to.</returns>
internal static Uri GetAbsoluteUriFromReference(string reference, Uri absoluteServiceUri)
{
Debug.Assert(!String.IsNullOrEmpty(reference), "!String.IsNullOrEmpty(reference) -- caller should check and throw appropriate message");
Debug.Assert(absoluteServiceUri != null, "absoluteServiceUri != null");
Debug.Assert(absoluteServiceUri.IsAbsoluteUri, "absoluteServiceUri.IsAbsoluteUri(" + absoluteServiceUri + ")");
Uri referenceAsUri = new Uri(reference, UriKind.RelativeOrAbsolute);
if (!referenceAsUri.IsAbsoluteUri)
{
string slash = String.Empty;
if (absoluteServiceUri.OriginalString.EndsWith("/", StringComparison.Ordinal))
{
if (reference.StartsWith("/", StringComparison.Ordinal))
{
reference = reference.Substring(1, reference.Length - 1);
}
}
else if (!reference.StartsWith("/", StringComparison.Ordinal))
{
slash = "/";
}
referenceAsUri = new Uri(absoluteServiceUri.OriginalString + slash + reference);
}
if (!UriUtil.UriInvariantInsensitiveIsBaseOf(absoluteServiceUri, referenceAsUri))
{
string message = Strings.BadRequest_RequestUriDoesNotHaveTheRightBaseUri(referenceAsUri, absoluteServiceUri);
throw DataServiceException.CreateBadRequestError(message);
}
Debug.Assert(
referenceAsUri.IsAbsoluteUri,
"referenceAsUri.IsAbsoluteUri(" + referenceAsUri + ") - otherwise composition from absolute yielded relative");
return referenceAsUri;
}
/// <summary>Gets the specified <paramref name="uri"/> as a string suitable for an HTTP request.</summary>
/// <param name="uri"><see cref="Uri"/> to get string for.</param>
/// <returns>A string suitable for an HTTP request.</returns>
internal static string GetHttpRequestUrl(Uri uri)
{
Debug.Assert(uri != null, "uri != null");
if (uri.IsAbsoluteUri)
{
return uri.GetComponents(UriComponents.HttpRequestUrl, UriFormat.UriEscaped);
}
else
{
return uri.OriginalString;
}
}
/// <summary>Gets the URI to the results, without the query component.</summary>
/// <param name="operationContext">OperationContext with request information.</param>
/// <returns>The URI to the results, without the query component.</returns>
internal static Uri GetResultUri(DataServiceOperationContext operationContext)
{
Debug.Assert(operationContext != null, "operationContext != null");
Uri requestUri = operationContext.AbsoluteRequestUri;
UriBuilder resultBuilder = new UriBuilder(requestUri);
resultBuilder.Query = null;
// This is fix for bug 565322.
// Since we don't allow uri to compose on collections, () must be present
// as the last thing in the uri, if present. We need to remove the () from
// the uri, since its a optional thing and we want to return a canonical
// uri from the server.
if (resultBuilder.Path.EndsWith("()", StringComparison.Ordinal))
{
resultBuilder.Path = resultBuilder.Path.Substring(0, resultBuilder.Path.Length - 2);
}
return resultBuilder.Uri;
}
/// <summary>
/// Returns an object that can enumerate the segments in the specified path (eg: /foo/bar -> foo, bar).
/// </summary>
/// <param name="absoluteRequestUri">A valid path portion of an uri.</param>
/// <param name="baseUri">baseUri for the request that is getting processed.</param>
/// <returns>An enumerable object of unescaped segments.</returns>
internal static string[] EnumerateSegments(Uri absoluteRequestUri, Uri baseUri)
{
Debug.Assert(absoluteRequestUri != null, "absoluteRequestUri != null");
Debug.Assert(absoluteRequestUri.IsAbsoluteUri, "absoluteRequestUri.IsAbsoluteUri(" + absoluteRequestUri.IsAbsoluteUri + ")");
Debug.Assert(baseUri != null, "baseUri != null");
Debug.Assert(baseUri.IsAbsoluteUri, "baseUri.IsAbsoluteUri(" + baseUri + ")");
if (!UriUtil.UriInvariantInsensitiveIsBaseOf(baseUri, absoluteRequestUri))
{
throw DataServiceException.CreateBadRequestError(Strings.BadRequest_RequestUriDoesNotHaveTheRightBaseUri(absoluteRequestUri, baseUri));
}
try
{
//
Uri uri = absoluteRequestUri;
int numberOfSegmentsToSkip = 0;
// Since there is a svc part in the segment, we will need to skip 2 segments
numberOfSegmentsToSkip = baseUri.Segments.Length;
string[] uriSegments = uri.Segments;
int populatedSegmentCount = 0;
for (int i = numberOfSegmentsToSkip; i < uriSegments.Length; i++)
{
string segment = uriSegments[i];
if (segment.Length != 0 && segment != "/")
{
populatedSegmentCount++;
}
}
string[] segments = new string[populatedSegmentCount];
int segmentIndex = 0;
for (int i = numberOfSegmentsToSkip; i < uriSegments.Length; i++)
{
string segment = uriSegments[i];
if (segment.Length != 0 && segment != "/")
{
if (segment[segment.Length - 1] == '/')
{
segment = segment.Substring(0, segment.Length - 1);
}
segments[segmentIndex++] = Uri.UnescapeDataString(segment);
}
}
Debug.Assert(segmentIndex == segments.Length, "segmentIndex == segments.Length -- otherwise we mis-counted populated/skipped segments.");
return segments;
}
catch (UriFormatException)
{
throw DataServiceException.CreateSyntaxError();
}
}
/// <summary>
/// Given the uri, extract the key values from the uri
/// </summary>
/// <param name="absoluteRequestUri">uri from which the key values needs to be extracted</param>
/// <param name="service">Data context for which the request is being processed.</param>
/// <param name="containerName">returns the name of the source resource set name</param>
/// <returns>key values as specified in the uri</returns>
internal static KeyInstance ExtractKeyValuesFromUri(Uri absoluteRequestUri, IDataService service, out string containerName)
{
Debug.Assert(absoluteRequestUri != null, "absoluteRequestUri != null");
Debug.Assert(absoluteRequestUri.IsAbsoluteUri, "absoluteRequestUri.IsAbsoluteUri(" + absoluteRequestUri + ")");
Debug.Assert(service != null, "service != null");
RequestDescription description = RequestUriProcessor.ProcessRequestUri(absoluteRequestUri, service);
//
if (description.TargetKind != RequestTargetKind.Resource || !description.IsSingleResult || description.TargetSource != RequestTargetSource.EntitySet)
{
throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_MustSpecifyCanonicalUriInPayload(absoluteRequestUri));
}
// Dereferencing an object by specifying its key values implied the right to read it.
Debug.Assert(description.LastSegmentInfo.SingleResult, "description.LastSegmentInfo.SingleResult");
DataServiceConfiguration.CheckResourceRightsForRead(description.LastSegmentInfo.TargetContainer, true /* singleResult */);
containerName = description.ContainerName;
Debug.Assert(description.LastSegmentInfo.Key != null && !description.LastSegmentInfo.Key.IsEmpty, "Key Must be specified");
return description.LastSegmentInfo.Key;
}
/// <summary>Invokes Queryable.Select for the specified query and selector.</summary>
/// <param name="query">Query to invoke .Select method on.</param>
/// <param name="projectedType">Type that will be projected out.</param>
/// <param name="selector">Selector lambda expression.</param>
/// <returns>The resulting query.</returns>
[System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining | System.Runtime.CompilerServices.MethodImplOptions.NoOptimization)]
internal static IQueryable InvokeSelectForTypes(IQueryable query, Type projectedType, LambdaExpression selector)
{
Debug.Assert(query != null, "query != null");
Debug.Assert(projectedType != null, "projectedType != null");
Debug.Assert(selector != null, "selector != null");
MethodInfo method = typeof(RequestUriProcessor).GetMethod("InvokeSelect", BindingFlags.Static | BindingFlags.NonPublic);
method = method.MakeGenericMethod(query.ElementType, projectedType);
return (IQueryable)method.Invoke(null, new object[] { query, selector });
}
/// <summary>Invokes Queryable.Where for the specified query and predicate.</summary>
/// <param name="query">Query to invoke .Where method on.</param>
/// <param name="predicate">Predicate to pass as argument.</param>
/// <returns>The resulting query.</returns>
[System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining | System.Runtime.CompilerServices.MethodImplOptions.NoOptimization)]
internal static IQueryable InvokeWhereForType(IQueryable query, LambdaExpression predicate)
{
Debug.Assert(query != null, "query != null");
Debug.Assert(predicate != null, "predicate != null");
MethodInfo whereMethod = InvokeWhereMethodInfo.MakeGenericMethod(query.ElementType);
return (IQueryable)whereMethod.Invoke(null, new object[] { query, predicate });
}
/// <summary>Composes the filter portion of a segment onto the specifies query.</summary>
/// <param name="filter">Filter portion of segment, possibly null.</param>
/// <param name="segment">Segment on which to compose.</param>
private static void ComposeQuery(string filter, SegmentInfo segment)
{
Debug.Assert(filter != null, "filter != null");
Debug.Assert(segment != null, "segment!= null");
Debug.Assert(segment.SingleResult == false, "segment.SingleResult == false");
ResourceType resourceType = segment.TargetResourceType;
segment.Key = ExtractKeyValues(resourceType, filter);
segment.SingleResult = !segment.Key.IsEmpty;
if (segment.SingleResult)
{
if (!segment.Key.AreValuesNamed && segment.Key.ValueCount > 1)
{
throw DataServiceException.CreateBadRequestError(Strings.RequestUriProcessor_KeysMustBeNamed);
}
segment.RequestQueryable = SelectResourceByKey(segment.RequestQueryable, resourceType, segment.Key);
segment.SingleResult = true;
}
}
/// <summary>Creates the first <see cref="SegmentInfo"/> for a request.</summary>
/// <param name="service">Service for which the request is being processed.</param>
/// <param name="identifier">Identifier portion of segment.</param>
/// <param name="checkRights">Whether rights should be checked on this segment.</param>
/// <param name="queryPortion">Query portion with key; possibly null.</param>
/// <param name="isLastSegment">True if the first segment is also the last segment.</param>
/// <param name="crossReferencingUrl">whether this segment references some other segment.</param>
/// <returns>A description of the information on the segment.</returns>
private static SegmentInfo CreateFirstSegment(IDataService service, string identifier, bool checkRights, string queryPortion, bool isLastSegment, out bool crossReferencingUrl)
{
Debug.Assert(service != null, "service != null");
Debug.Assert(identifier != null, "identifier != null");
crossReferencingUrl = false;
SegmentInfo segment = new SegmentInfo();
segment.Identifier = identifier;
// Look for well-known system entry points.
if (segment.Identifier == XmlConstants.UriMetadataSegment)
{
WebUtil.CheckSyntaxValid(queryPortion == null);
segment.TargetKind = RequestTargetKind.Metadata;
return segment;
}
if (segment.Identifier == XmlConstants.UriBatchSegment)
{
WebUtil.CheckSyntaxValid(queryPortion == null);
segment.TargetKind = RequestTargetKind.Batch;
return segment;
}
if (segment.Identifier == XmlConstants.UriCountSegment)
{
// $count on root: throw
throw DataServiceException.CreateResourceNotFound(Strings.RequestUriProcessor_CountOnRoot);
}
// Look for a service operation.
segment.Operation = service.Provider.TryResolveServiceOperation(segment.Identifier);
if (segment.Operation != null)
{
WebUtil.DebugEnumIsDefined(segment.Operation.ResultKind);
segment.TargetSource = RequestTargetSource.ServiceOperation;
if (service.OperationContext.RequestMethod != segment.Operation.Method)
{
throw DataServiceException.CreateMethodNotAllowed(Strings.RequestUriProcessor_MethodNotAllowed, segment.Operation.Method);
}
segment.TargetContainer = segment.Operation.ResourceSet;
if (segment.Operation.ResultKind != ServiceOperationResultKind.Void)
{
segment.TargetResourceType = segment.Operation.ResultType;
}
else
{
segment.TargetResourceType = null;
}
segment.OperationParameters = ReadOperationParameters(service.OperationContext.Host, segment.Operation);
switch (segment.Operation.ResultKind)
{
case ServiceOperationResultKind.QueryWithMultipleResults:
case ServiceOperationResultKind.QueryWithSingleResult:
try
{
segment.RequestQueryable = (IQueryable)service.Provider.InvokeServiceOperation(segment.Operation, segment.OperationParameters);
}
catch (TargetInvocationException exception)
{
ErrorHandler.HandleTargetInvocationException(exception);
throw;
}
WebUtil.CheckResourceExists(segment.RequestQueryable != null, segment.Identifier);
segment.SingleResult = (segment.Operation.ResultKind == ServiceOperationResultKind.QueryWithSingleResult);
break;
case ServiceOperationResultKind.DirectValue:
case ServiceOperationResultKind.Enumeration:
object methodResult;
try
{
methodResult = service.Provider.InvokeServiceOperation(segment.Operation, segment.OperationParameters);
}
catch (TargetInvocationException exception)
{
ErrorHandler.HandleTargetInvocationException(exception);
throw;
}
segment.SingleResult = (segment.Operation.ResultKind == ServiceOperationResultKind.DirectValue);
WebUtil.CheckResourceExists(segment.SingleResult || methodResult != null, segment.Identifier); // Enumerations shouldn't be null.
segment.RequestEnumerable = segment.SingleResult ? new object[1] { methodResult } : (IEnumerable)methodResult;
segment.TargetResourceType = segment.Operation.ResultType;
segment.TargetKind = TargetKindFromType(segment.TargetResourceType);
WebUtil.CheckSyntaxValid(queryPortion == null);
RequestQueryProcessor.CheckEmptyQueryArguments(service, false /*checkForOnlyV2QueryParameters*/);
break;
default:
Debug.Assert(segment.Operation.ResultKind == ServiceOperationResultKind.Void, "segment.Operation.ResultKind == ServiceOperationResultKind.Nothing");
segment.TargetKind = RequestTargetKind.VoidServiceOperation;
break;
}
if (segment.RequestQueryable != null)
{
segment.TargetKind = TargetKindFromType(segment.TargetResourceType);
if (queryPortion != null)
{
WebUtil.CheckSyntaxValid(!segment.SingleResult);
ComposeQuery(queryPortion, segment);
}
}
if (checkRights)
{
DataServiceConfiguration.CheckServiceRights(segment.Operation, segment.SingleResult);
}
return segment;
}
SegmentInfo newSegmentInfo = service.GetSegmentForContentId(segment.Identifier);
if (newSegmentInfo != null)
{
newSegmentInfo.Identifier = segment.Identifier;
crossReferencingUrl = true;
return newSegmentInfo;
}
// Look for an entity set.
ResourceSetWrapper container = service.Provider.TryResolveResourceSet(segment.Identifier);
WebUtil.CheckResourceExists(container != null, segment.Identifier);
if (ShouldRequestQuery(service, isLastSegment, false, queryPortion))
{
#if DEBUG
segment.RequestQueryable = service.Provider.GetQueryRootForResourceSet(container, service);
#else
segment.RequestQueryable = service.Provider.GetQueryRootForResourceSet(container);
#endif
WebUtil.CheckResourceExists(segment.RequestQueryable != null, segment.Identifier);
}
segment.TargetContainer = container;
segment.TargetResourceType = container.ResourceType;
segment.TargetSource = RequestTargetSource.EntitySet;
segment.TargetKind = RequestTargetKind.Resource;
segment.SingleResult = false;
if (queryPortion != null)
{
ComposeQuery(queryPortion, segment);
}
if (checkRights)
{
DataServiceConfiguration.CheckResourceRightsForRead(container, segment.SingleResult);
}
if (segment.RequestQueryable != null)
{
// We only need to invoke the query interceptor if we called get query root.
segment.RequestQueryable = DataServiceConfiguration.ComposeResourceContainer(service, container, segment.RequestQueryable);
}
return segment;
}
/// <summary>Whether a query should be requested and composed with interceptors for a segment.</summary>
/// <param name="service">Service under which request is being analyzed.</param>
/// <param name="isLastSegment">Whether this is the last segment of the URI.</param>
/// <param name="isAfterLink">Is the current segment being checked after a $links segment.</param>
/// <param name="queryPortion">Query portion of the segment.</param>
/// <returns>true if the segments should be read and composed with interceptors; false otherwise.</returns>
/// <remarks>
/// For V1 providers we always get the query root or else we introduce a breaking change.
/// If this is an insert operation and the current segment is the first and last segment,
/// we don't need to get the query root as we won't even invoke the query.
/// Note that we need to make sure we only skip the query root if the query portion is null, this
/// is because in the deep insert case, we can be doing a binding to a single entity and we would
/// need the query root for that entity.
/// We shall also skip requesting the query if the request is for an update on $links for non-V1 providers.
/// </remarks>
private static bool ShouldRequestQuery(IDataService service, bool isLastSegment, bool isAfterLink, string queryPortion)
{
Debug.Assert(service != null, "service != null");
if (service.Provider.IsV1Provider)
{
return true;
}
AstoriaVerbs verbUsed = service.OperationContext.Host.AstoriaHttpVerb;
bool isPostQueryForSet = isLastSegment && verbUsed == AstoriaVerbs.POST && string.IsNullOrEmpty(queryPortion);
bool isUpdateQueryForLinks = isAfterLink && (verbUsed == AstoriaVerbs.PUT || verbUsed == AstoriaVerbs.MERGE);
return !(isPostQueryForSet || isUpdateQueryForLinks);
}
/// <summary>Creates a <see cref="SegmentInfo"/> array for the given <paramref name="segments"/>.</summary>
/// <param name="segments">Segments to process.</param>
/// <param name="service">Service for which segments are being processed.</param>
/// <returns>Segment information describing the given <paramref name="segments"/>.</returns>
private static SegmentInfo[] CreateSegments(string[] segments, IDataService service)
{
Debug.Assert(segments != null, "segments != null");
Debug.Assert(service != null, "service != null");
SegmentInfo previous = null;
SegmentInfo[] segmentInfos = new SegmentInfo[segments.Length];
bool crossReferencingUri = false;
bool postLinkSegment = false;
for (int i = 0; i < segments.Length; i++)
{
string segmentText = segments[i];
bool checkRights = (i != segments.Length - 1); // Whether rights should be checked on this segment.
string identifier;
bool hasQuery = ExtractSegmentIdentifier(segmentText, out identifier);
string queryPortion = hasQuery ? segmentText.Substring(identifier.Length) : null;
SegmentInfo segment;
// We allow a single trailing '/', which results in an empty segment.
// However System.Uri removes it, so any empty segment we see is a 404 error.
if (identifier.Length == 0)
{
throw DataServiceException.ResourceNotFoundError(Strings.RequestUriProcessor_EmptySegmentInRequestUrl);
}
if (previous == null)
{
segment = CreateFirstSegment(service, identifier, checkRights, queryPortion, segments.Length == 1, out crossReferencingUri);
}
else if (previous.TargetKind == RequestTargetKind.Batch ||
previous.TargetKind == RequestTargetKind.Metadata ||
previous.TargetKind == RequestTargetKind.PrimitiveValue ||
previous.TargetKind == RequestTargetKind.VoidServiceOperation ||
previous.TargetKind == RequestTargetKind.OpenPropertyValue ||
previous.TargetKind == RequestTargetKind.MediaResource)
{
// Nothing can come after a $metadata, $value or $batch segment.
// Nothing can come after a service operation with void return type.
throw DataServiceException.ResourceNotFoundError(Strings.RequestUriProcessor_MustBeLeafSegment(previous.Identifier));
}
else if (postLinkSegment && identifier != XmlConstants.UriCountSegment)
{
// DEVNOTE(Microsoft): [Resources]/$links/[Property]/$count is valid
throw DataServiceException.ResourceNotFoundError(Strings.RequestUriProcessor_CannotSpecifyAfterPostLinkSegment(identifier, XmlConstants.UriLinkSegment));
}
else if (previous.TargetKind == RequestTargetKind.Primitive)
{
// $value is the well-known identifier to return a primitive property
// in its natural MIME format.
if (identifier != XmlConstants.UriValueSegment)
{
throw DataServiceException.ResourceNotFoundError(Strings.RequestUriProcessor_ValueSegmentAfterScalarPropertySegment(previous.Identifier, identifier));
}
WebUtil.CheckSyntaxValid(!hasQuery);
segment = new SegmentInfo(previous);
segment.Identifier = identifier;
segment.SingleResult = true;
segment.TargetKind = RequestTargetKind.PrimitiveValue;
}
else if (previous.TargetKind == RequestTargetKind.Resource &&
previous.SingleResult &&
identifier == XmlConstants.UriLinkSegment)
{
segment = new SegmentInfo(previous);
segment.Identifier = identifier;
segment.TargetKind = RequestTargetKind.Link;
}
else
{
Debug.Assert(
previous.TargetKind == RequestTargetKind.ComplexObject ||
previous.TargetKind == RequestTargetKind.Resource ||
previous.TargetKind == RequestTargetKind.OpenProperty ||
previous.TargetKind == RequestTargetKind.Link,
"previous.TargetKind(" + previous.TargetKind + ") can have properties");
postLinkSegment = (previous.TargetKind == RequestTargetKind.Link);
// Enumerable and DirectValue results cannot be composed at all.
if (previous.Operation != null && (previous.Operation.ResultKind == ServiceOperationResultKind.Enumeration || previous.Operation.ResultKind == ServiceOperationResultKind.DirectValue))
{
throw DataServiceException.ResourceNotFoundError(
Strings.RequestUriProcessor_IEnumerableServiceOperationsCannotBeFurtherComposed(previous.Identifier));
}
if (!previous.SingleResult && identifier != XmlConstants.UriCountSegment)
{
// $count can be applied to a collection
throw DataServiceException.CreateBadRequestError(
Strings.RequestUriProcessor_CannotQueryCollections(previous.Identifier));
}
segment = new SegmentInfo();
segment.Identifier = identifier;
segment.TargetSource = RequestTargetSource.Property;
// A segment will correspond to a property in the object model;
// if we are processing an open type, anything further in the
// URI also represents an open type property.
if (previous.TargetResourceType == null)
{
Debug.Assert(previous.TargetKind == RequestTargetKind.OpenProperty, "For open properties, the target resource type must be null");
segment.ProjectedProperty = null;
}
else
{
Debug.Assert(previous.TargetKind != RequestTargetKind.OpenProperty, "Since the query element type is known, this can't be open property");
Debug.Assert(previous.TargetResourceType != null, "Previous wasn't open, so it should have a resource type");
segment.ProjectedProperty = previous.TargetResourceType.TryResolvePropertyName(identifier);
}
if (identifier == XmlConstants.UriCountSegment)
{
if (previous.TargetKind != RequestTargetKind.Resource)
{
throw DataServiceException.CreateResourceNotFound(Strings.RequestUriProcessor_CountNotSupported(previous.Identifier));
}
if (previous.SingleResult)
{
throw DataServiceException.CreateResourceNotFound(Strings.RequestUriProcessor_CannotQuerySingletons(previous.Identifier, identifier));
}
if (service.OperationContext.Host.AstoriaHttpVerb != AstoriaVerbs.GET)
{
throw DataServiceException.CreateBadRequestError(Strings.RequestQueryProcessor_RequestVerbCannotCountError);
}
segment.RequestEnumerable = previous.RequestEnumerable;
segment.SingleResult = true;
segment.TargetKind = RequestTargetKind.PrimitiveValue;
segment.TargetResourceType = previous.TargetResourceType;
segment.TargetContainer = previous.TargetContainer;
}
else if (identifier == XmlConstants.UriValueSegment &&
(previous.TargetKind == RequestTargetKind.OpenProperty || (previous.TargetKind == RequestTargetKind.Resource)))
{
segment.RequestEnumerable = previous.RequestEnumerable;
segment.SingleResult = true;
segment.TargetResourceType = previous.TargetResourceType;
if (previous.TargetKind == RequestTargetKind.OpenProperty)
{
segment.TargetKind = RequestTargetKind.OpenPropertyValue;
}
else
{
// If the previous segment is an entity, we expect it to be an MLE. We cannot validate our assumption
// until later when we get the actual instance of the entity because the type hierarchy can contain
// a mix of MLE and non-MLE types.
segment.TargetKind = RequestTargetKind.MediaResource;
// There is no valid query option for Media Resource.
RequestQueryProcessor.CheckEmptyQueryArguments(service, false /*checkForOnlyV2QueryParameters*/);
}
}
else if (segment.ProjectedProperty == null)
{
// Handle an open type property. If the current leaf isn't an
// object (which implies it's already an open type), then
// it should be marked as an open type.
if (previous.TargetResourceType != null)
{
WebUtil.CheckResourceExists(previous.TargetResourceType.IsOpenType, segment.Identifier);
}
// Open navigation properties are not supported on OpenTypes. We should throw on the following cases:
// 1. the segment after $links is always a navigation property pointing to a resource
// 2. if the segment hasQuery, it is pointing to a resource
// 3. if this is a POST operation, the target has to be either a set of links or an entity set
if (previous.TargetKind == RequestTargetKind.Link || hasQuery || service.OperationContext.Host.AstoriaHttpVerb == AstoriaVerbs.POST)
{
throw DataServiceException.CreateBadRequestError(Strings.OpenNavigationPropertiesNotSupportedOnOpenTypes(segment.Identifier));
}
segment.TargetResourceType = null;
segment.TargetKind = RequestTargetKind.OpenProperty;
segment.SingleResult = true;
if (!crossReferencingUri)
{
segment.RequestQueryable = SelectOpenProperty(previous.RequestQueryable, identifier);
}
}
else
{
// Handle a strongly-typed property.
segment.TargetResourceType = segment.ProjectedProperty.ResourceType;
ResourcePropertyKind propertyKind = segment.ProjectedProperty.Kind;
segment.SingleResult = (propertyKind != ResourcePropertyKind.ResourceSetReference);
if (!crossReferencingUri)
{
if (segment.ProjectedProperty.CanReflectOnInstanceTypeProperty)
{
segment.RequestQueryable = segment.SingleResult ?
SelectElement(previous.RequestQueryable, segment.ProjectedProperty) :
SelectMultiple(previous.RequestQueryable, segment.ProjectedProperty);
}
else
{
segment.RequestQueryable = segment.SingleResult ?
SelectLateBoundProperty(
previous.RequestQueryable,
segment.ProjectedProperty) :
SelectLateBoundPropertyMultiple(
previous.RequestQueryable,
segment.ProjectedProperty);
}
}
if (previous.TargetKind == RequestTargetKind.Link &&
segment.ProjectedProperty.TypeKind != ResourceTypeKind.EntityType)
{
throw DataServiceException.CreateBadRequestError(Strings.RequestUriProcessor_LinkSegmentMustBeFollowedByEntitySegment(identifier, XmlConstants.UriLinkSegment));
}
switch (propertyKind)
{
case ResourcePropertyKind.ComplexType:
segment.TargetKind = RequestTargetKind.ComplexObject;
break;
case ResourcePropertyKind.ResourceReference:
case ResourcePropertyKind.ResourceSetReference:
segment.TargetKind = RequestTargetKind.Resource;
segment.TargetContainer = service.Provider.GetContainer(previous.TargetContainer, previous.TargetResourceType, segment.ProjectedProperty);
if (segment.TargetContainer == null)
{
throw DataServiceException.CreateResourceNotFound(segment.ProjectedProperty.Name);
}
break;
default:
Debug.Assert(segment.ProjectedProperty.IsOfKind(ResourcePropertyKind.Primitive), "must be primitive type property");
segment.TargetKind = RequestTargetKind.Primitive;
break;
}
if (hasQuery)
{
WebUtil.CheckSyntaxValid(!segment.SingleResult);
if (!crossReferencingUri)
{
ComposeQuery(queryPortion, segment);
}
else
{
throw DataServiceException.CreateBadRequestError(Strings.BadRequest_ResourceCanBeCrossReferencedOnlyForBindOperation);
}
}
// Do security checks and authorization query composition.
if (segment.TargetContainer != null)
{
if (checkRights)
{
DataServiceConfiguration.CheckResourceRightsForRead(segment.TargetContainer, segment.SingleResult);
}
if (!crossReferencingUri && ShouldRequestQuery(service, i == segments.Length - 1, postLinkSegment, queryPortion))
{
segment.RequestQueryable = DataServiceConfiguration.ComposeResourceContainer(service, segment.TargetContainer, segment.RequestQueryable);
}
}
}
}
#if DEBUG
segment.AssertValid();
#endif
segmentInfos[i] = segment;
previous = segment;
}
if (segments.Length != 0 && previous.TargetKind == RequestTargetKind.Link)
{
throw DataServiceException.CreateBadRequestError(Strings.RequestUriProcessor_MissingSegmentAfterLink(XmlConstants.UriLinkSegment));
}
return segmentInfos;
}
/// <summary>Returns an object that can enumerate key values.</summary>
/// <param name="resourceType">resource type whose keys need to be extracted</param>
/// <param name="filter">Key (query) part of an Astoria segment.</param>
/// <returns>An object that can enumerate key values.</returns>
private static KeyInstance ExtractKeyValues(ResourceType resourceType, string filter)
{
KeyInstance key;
filter = RemoveFilterParens(filter);
WebUtil.CheckSyntaxValid(KeyInstance.TryParseKeysFromUri(filter, out key));
if (!key.IsEmpty)
{
// Make sure the keys specified in the uri matches with the number of keys in the metadata
if (resourceType.KeyProperties.Count != key.ValueCount)
{
throw DataServiceException.CreateBadRequestError(Strings.BadRequest_KeyCountMismatch(resourceType.FullName));
}
WebUtil.CheckSyntaxValid(key.TryConvertValues(resourceType));
}
return key;
}
/// <summary>Extracts the identifier part of the unescaped Astoria segment.</summary>
/// <param name="segment">Unescaped Astoria segment.</param>
/// <param name="identifier">On returning, the identifier in the segment.</param>
/// <returns>true if keys follow the identifier.</returns>
private static bool ExtractSegmentIdentifier(string segment, out string identifier)
{
Debug.Assert(segment != null, "segment != null");
int filterStart = 0;
while (filterStart < segment.Length && segment[filterStart] != '(')
{
filterStart++;
}
identifier = segment.Substring(0, filterStart);
return filterStart < segment.Length;
}
/// <summary>Generic method to invoke a Select method on an IQueryable source.</summary>
/// <typeparam name="TSource">Element type of the source.</typeparam>
/// <typeparam name="TResult">Result type of the projection.</typeparam>
/// <param name="source">Source query.</param>
/// <param name="selector">Lambda expression that turns TSource into TResult.</param>
/// <returns>A new query that projects TSource into TResult.</returns>
private static IQueryable InvokeSelect<TSource, TResult>(IQueryable source, LambdaExpression selector)
{
Debug.Assert(source != null, "source != null");
Debug.Assert(selector != null, "selector != null");
IQueryable<TSource> typedSource = (IQueryable<TSource>)source;
Expression<Func<TSource, TResult>> typedSelector = (Expression<Func<TSource, TResult>>)selector;
return Queryable.Select<TSource, TResult>(typedSource, typedSelector);
}
/// <summary>Generic method to invoke a SelectMany method on an IQueryable source.</summary>
/// <typeparam name="TSource">Element type of the source.</typeparam>
/// <typeparam name="TResult">Result type of the projection.</typeparam>
/// <param name="source">Source query.</param>
/// <param name="selector">Lambda expression that turns TSource into IEnumerable<TResult>.</param>
/// <returns>A new query that projects TSource into IEnumerable<TResult>.</returns>
private static IQueryable InvokeSelectMany<TSource, TResult>(IQueryable source, LambdaExpression selector)
{
Debug.Assert(source != null, "source != null");
Debug.Assert(selector != null, "selector != null");
IQueryable<TSource> typedSource = (IQueryable<TSource>)source;
Expression<Func<TSource, IEnumerable<TResult>>> typedSelector = (Expression<Func<TSource, IEnumerable<TResult>>>)selector;
return Queryable.SelectMany<TSource, TResult>(typedSource, typedSelector);
}
/// <summary>Generic method to invoke a Where method on an IQueryable source.</summary>
/// <typeparam name="TSource">Element type of the source.</typeparam>
/// <param name="query">Source query.</param>
/// <param name="predicate">Lambda expression that filters the result of the query.</param>
/// <returns>A new query that filters the query.</returns>
private static IQueryable InvokeWhere<TSource>(IQueryable query, LambdaExpression predicate)
{
Debug.Assert(query != null, "query != null");
Debug.Assert(predicate != null, "predicate != null");
IQueryable<TSource> typedQueryable = (IQueryable<TSource>)query;
// If the type of predicate is not TSource, we need to replace the parameter with
// a downcasted parameter type if predicate's input is a base class of TSource.
if (predicate.Parameters[0].Type != typeof(TSource) &&
predicate.Parameters[0].Type.IsAssignableFrom(typeof(TSource)))
{
predicate = RequestUriProcessor.ReplaceParameterTypeForLambda(predicate, typeof(TSource));
}
Expression<Func<TSource, bool>> typedPredicate = (Expression<Func<TSource, bool>>)predicate;
return Queryable.Where<TSource>(typedQueryable, typedPredicate);
}
/// <summary>Replaced the type of input parameter with the given <paramref name="targetType"/></summary>
/// <param name="input">Input lambda expression.</param>
/// <param name="targetType">Type of the new parameter that will be replaced.</param>
/// <returns>New lambda expression with parameter of new type.</returns>
private static LambdaExpression ReplaceParameterTypeForLambda(LambdaExpression input, Type targetType)
{
Debug.Assert(input.Parameters.Count == 1, "Assuming a single parameter for input lambda expression in this function.");
ParameterExpression p = Expression.Parameter(targetType, input.Parameters[0].Name);
return Expression.Lambda(
ParameterReplacerVisitor.Replace(input.Body, input.Parameters[0], p),
p);
}
/// <summary>
/// Reads the parameters for the specified <paramref name="operation"/> from the
/// <paramref name="host"/>.
/// </summary>
/// <param name="host">Host with request information.</param>
/// <param name="operation">Operation with parameters to be read.</param>
/// <returns>A new object[] with parameter values.</returns>
private static object[] ReadOperationParameters(DataServiceHostWrapper host, ServiceOperationWrapper operation)
{
Debug.Assert(host != null, "host != null");
object[] operationParameters = new object[operation.Parameters.Count];
for (int i = 0; i < operation.Parameters.Count; i++)
{
Type parameterType = operation.Parameters[i].ParameterType.InstanceType;
string queryStringValue = host.GetQueryStringItem(operation.Parameters[i].Name);
Type underlyingType = Nullable.GetUnderlyingType(parameterType);
if (String.IsNullOrEmpty(queryStringValue))
{
WebUtil.CheckSyntaxValid(parameterType.IsClass || underlyingType != null);
operationParameters[i] = null;
}
else
{
// We choose to be a little more flexible than with keys and
// allow surrounding whitespace (which is never significant).
// See SQLBUDT #555944.
queryStringValue = queryStringValue.Trim();
Type targetType = underlyingType ?? parameterType;
if (WebConvert.IsKeyTypeQuoted(targetType))
{
WebUtil.CheckSyntaxValid(WebConvert.IsKeyValueQuoted(queryStringValue));
}
WebUtil.CheckSyntaxValid(WebConvert.TryKeyStringToPrimitive(queryStringValue, targetType, out operationParameters[i]));
}
}
return operationParameters;
}
/// <summary>Removes the parens around the filter part of a query.</summary>
/// <param name='filter'>Filter with parens included.</param>
/// <returns>Filter without parens.</returns>
private static string RemoveFilterParens(string filter)
{
Debug.Assert(filter != null, "filter != null");
WebUtil.CheckSyntaxValid(filter.Length > 0 && filter[0] == '(' && filter[filter.Length - 1] == ')');
return filter.Substring(1, filter.Length - 2);
}
/// <summary>Project a property with a single element out of the specified query.</summary>
/// <param name="query">Base query to project from.</param>
/// <param name="property">Property to project.</param>
/// <returns>A query with a composed primitive property projection.</returns>
[System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining | System.Runtime.CompilerServices.MethodImplOptions.NoOptimization)]
private static IQueryable SelectElement(IQueryable query, ResourceProperty property)
{
Debug.Assert(query != null, "query != null");
Debug.Assert(property.Kind != ResourcePropertyKind.ResourceSetReference, "property != ResourcePropertyKind.ResourceSetReference");
ParameterExpression parameter = Expression.Parameter(query.ElementType, "element");
MemberExpression body = Expression.Property(parameter, property.Name);
LambdaExpression selector = Expression.Lambda(body, parameter);
MethodInfo method = typeof(RequestUriProcessor).GetMethod("InvokeSelect", BindingFlags.Static | BindingFlags.NonPublic);
method = method.MakeGenericMethod(query.ElementType, property.Type);
return (IQueryable)method.Invoke(null, new object[] { query, selector });
}
/// <summary>Project a property with multiple elements out of the specified query.</summary>
/// <param name="query">Base query to project from.</param>
/// <param name="property">Property to project.</param>
/// <returns>A query with a composed primitive property projection.</returns>
[System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining | System.Runtime.CompilerServices.MethodImplOptions.NoOptimization)]
private static IQueryable SelectMultiple(IQueryable query, ResourceProperty property)
{
Debug.Assert(query != null, "query != null");
Debug.Assert(property.Kind == ResourcePropertyKind.ResourceSetReference, "property == ResourcePropertyKind.ResourceSetReference");
Type enumerableElement = BaseServiceProvider.GetIEnumerableElement(property.Type);
Debug.Assert(enumerableElement != null, "Providers should never expose a property as a resource-set if it doesn't implement IEnumerable`1.");
ParameterExpression parameter = Expression.Parameter(query.ElementType, "element");
UnaryExpression body =
Expression.ConvertChecked(
Expression.Property(parameter, property.Name),
typeof(IEnumerable<>).MakeGenericType(enumerableElement));
LambdaExpression selector = Expression.Lambda(body, parameter);
MethodInfo method = typeof(RequestUriProcessor).GetMethod("InvokeSelectMany", BindingFlags.Static | BindingFlags.NonPublic);
method = method.MakeGenericMethod(query.ElementType, enumerableElement);
return (IQueryable)method.Invoke(null, new object[] { query, selector });
}
/// <summary>Project a property with a single element out of the specified query over an late bound (possibily open) property.</summary>
/// <param name="query">Base query to project from.</param>
/// <param name="propertyName">Name of property to project.</param>
/// <returns>A query with a composed property projection.</returns>
[System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining | System.Runtime.CompilerServices.MethodImplOptions.NoOptimization)]
private static IQueryable SelectOpenProperty(IQueryable query, string propertyName)
{
Debug.Assert(query != null, "query != null");
Debug.Assert(propertyName != null, "propertyName != null");
ParameterExpression parameter = Expression.Parameter(query.ElementType, "element");
Expression body = Expression.Call(null /* instance */, OpenTypeMethods.GetValueOpenPropertyMethodInfo, parameter, Expression.Constant(propertyName));
LambdaExpression selector = Expression.Lambda(body, parameter);
MethodInfo method = typeof(RequestUriProcessor).GetMethod("InvokeSelect", BindingFlags.Static | BindingFlags.NonPublic);
method = method.MakeGenericMethod(query.ElementType, typeof(object));
return (IQueryable)method.Invoke(null, new object[] { query, selector });
}
/// <summary>Project a property with a single element out of the specified query over an late bound (possibily open) property.</summary>
/// <param name="query">Base query to project from.</param>
/// <param name="property">Resource property containing the metadata for the late bound property.</param>
/// <returns>A query with a composed property projection.</returns>
[System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining | System.Runtime.CompilerServices.MethodImplOptions.NoOptimization)]
private static IQueryable SelectLateBoundProperty(IQueryable query, ResourceProperty property)
{
Debug.Assert(query != null, "query != null");
Debug.Assert(property != null && !property.CanReflectOnInstanceTypeProperty, "property != null && !property.CanReflectOnInstanceTypeProperty");
ParameterExpression parameter = Expression.Parameter(query.ElementType, "element");
Expression body = Expression.Call(null /*instance*/, DataServiceProviderMethods.GetValueMethodInfo, parameter, Expression.Constant(property));
body = Expression.Convert(body, property.Type);
LambdaExpression selector = Expression.Lambda(body, parameter);
MethodInfo method = typeof(RequestUriProcessor).GetMethod("InvokeSelect", BindingFlags.Static | BindingFlags.NonPublic);
method = method.MakeGenericMethod(query.ElementType, property.Type);
return (IQueryable)method.Invoke(null, new object[] { query, selector });
}
/// <summary>Project a property with a single element out of the specified query over an late bound (possibily open) property.</summary>
/// <param name="query">Base query to project from.</param>
/// <param name="property">Resource property containing the metadata for the late bound property.</param>
/// <returns>A query with a composed property projection.</returns>
[System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining | System.Runtime.CompilerServices.MethodImplOptions.NoOptimization)]
private static IQueryable SelectLateBoundPropertyMultiple(IQueryable query, ResourceProperty property)
{
Debug.Assert(query != null, "query != null");
Debug.Assert(property != null && property.Kind == ResourcePropertyKind.ResourceSetReference && !property.CanReflectOnInstanceTypeProperty, "property != null && property.Kind == ResourcePropertyKind.ResourceSetReference && !property.CanReflectOnInstanceTypeProperty");
Type enumerableElement = BaseServiceProvider.GetIEnumerableElement(property.Type);
ParameterExpression parameter = Expression.Parameter(query.ElementType, "element");
MethodInfo getter = DataServiceProviderMethods.GetSequenceValueMethodInfo.MakeGenericMethod(enumerableElement);
Expression body = Expression.Call(null /*instance*/, getter, parameter, Expression.Constant(property));
LambdaExpression selector = Expression.Lambda(body, parameter);
MethodInfo method = typeof(RequestUriProcessor).GetMethod("InvokeSelectMany", BindingFlags.Static | BindingFlags.NonPublic);
method = method.MakeGenericMethod(query.ElementType, enumerableElement);
return (IQueryable)method.Invoke(null, new object[] { query, selector });
}
/// <summary>Selects a single resource by key values.</summary>
/// <param name="query">Base query for resources</param>
/// <param name="resourceType">resource type whose keys are specified</param>
/// <param name="key">Key values for the given resource type.</param>
/// <returns>A new query that selects the single resource that matches the specified key values.</returns>
private static IQueryable SelectResourceByKey(IQueryable query, ResourceType resourceType, KeyInstance key)
{
Debug.Assert(query != null, "query != null");
Debug.Assert(key != null && key.ValueCount != 0, "key != null && key.ValueCount != 0");
Debug.Assert(resourceType.KeyProperties.Count == key.ValueCount, "resourceType.KeyProperties.Count == key.ValueCount");
for (int i = 0; i < resourceType.KeyProperties.Count; i++)
{
ResourceProperty keyProperty = resourceType.KeyProperties[i];
Debug.Assert(keyProperty.IsOfKind(ResourcePropertyKind.Key), "keyProperty.IsOfKind(ResourcePropertyKind.Key)");
object keyValue;
if (key.AreValuesNamed)
{
keyValue = key.NamedValues[keyProperty.Name];
}
else
{
keyValue = key.PositionalValues[i];
}
ParameterExpression parameter = Expression.Parameter(query.ElementType, "element");
Expression e;
if (keyProperty.CanReflectOnInstanceTypeProperty)
{
e = Expression.Property(parameter, keyProperty.Name);
}
else
{
e = Expression.Call(null /*instance*/, DataServiceProviderMethods.GetValueMethodInfo, parameter, Expression.Constant(keyProperty));
e = Expression.Convert(e, keyProperty.Type);
}
BinaryExpression body = Expression.Equal((Expression)e, Expression.Constant(keyValue));
LambdaExpression predicate = Expression.Lambda(body, parameter);
query = InvokeWhereForType(query, predicate);
}
return query;
}
/// <summary>Determines a matching target kind from the specified type.</summary>
/// <param name="type">ResourceType of element to get kind for.</param>
/// <returns>An appropriate <see cref="RequestTargetKind"/> for the specified <paramref name="type"/>.</returns>
private static RequestTargetKind TargetKindFromType(ResourceType type)
{
Debug.Assert(type != null, "type != null");
switch (type.ResourceTypeKind)
{
case ResourceTypeKind.ComplexType:
return RequestTargetKind.ComplexObject;
case ResourceTypeKind.EntityType:
return RequestTargetKind.Resource;
default:
Debug.Assert(type.ResourceTypeKind == ResourceTypeKind.Primitive, "typeKind == ResourceTypeKind.Primitive");
return RequestTargetKind.Primitive;
}
}
}
}
|