/// <summary>
/// Creates a list of path segments for the specified URI query.
/// </summary>
/// <param name="queryUri">The absolute URI of the request.</param>
/// <param name="serviceBaseUri">The service base URI for the request.</param>
/// <returns>The <see cref="QueryToken"/> representing the query path.</returns>
private QueryToken CreatePathSegments(Uri queryUri, Uri serviceBaseUri)
{
Debug.Assert(queryUri != null, "queryUri != null");
Debug.Assert(serviceBaseUri != null, "serviceBaseUri != null");
//// This method is a no-metadata, lexical only copy of RequestUriProcessor.CreateSegments
List <string> uriSegments = this.EnumerateSegments(queryUri, serviceBaseUri);
Debug.Assert(uriSegments.Count <= this.maxDepth, "uriSegments.Count <= this.maxDepth");
// The segment before the one being processed
SegmentQueryToken parentNode = null;
foreach (string uriSegment in uriSegments)
{
Debug.Assert(uriSegment != null, "uriSegment != null");
string segmentIdentifier;
bool hasKeyValues = ExtractSegmentIdentifier(uriSegment, out segmentIdentifier);
string keyValuesString = hasKeyValues ? uriSegment.Substring(segmentIdentifier.Length) : null;
KeywordKind?keyword = QueryTokenUtils.ParseKeywordKind(segmentIdentifier);
parentNode = keyword == null
? new SegmentQueryToken(
segmentIdentifier,
parentNode,
hasKeyValues ? ParseKeyValues(keyValuesString) : null)
: new KeywordSegmentQueryToken(keyword.Value, parentNode);
}
return(parentNode);
}
/// <summary>
/// Parses the <paramref name="queryUri"/> and returns a new instance of <see cref="SyntacticTree"/>
/// describing the query specified by the uri.
/// </summary>
/// <param name="queryUri">The absolute URI which holds the query to parse. This must be a path relative to the <paramref name="serviceBaseUri"/>.</param>
/// <param name="serviceBaseUri">The base URI of the service.</param>
/// <param name="maxDepth">The maximum depth of any single query part. Security setting to guard against DoS attacks causing stack overflows and such.</param>
/// <returns>A new instance of <see cref="SyntacticTree"/> which represents the query specified in the <paramref name="queryUri"/>.</returns>
public static SyntacticTree ParseUri(Uri queryUri, Uri serviceBaseUri, int maxDepth)
{
ExceptionUtils.CheckArgumentNotNull(queryUri, "queryUri");
if (!queryUri.IsAbsoluteUri)
{
throw new ArgumentException(Strings.SyntacticTree_UriMustBeAbsolute(queryUri), "queryUri");
}
ExceptionUtils.CheckArgumentNotNull(serviceBaseUri, "serviceBaseUri");
if (!serviceBaseUri.IsAbsoluteUri)
{
throw new ArgumentException(Strings.SyntacticTree_UriMustBeAbsolute(serviceBaseUri), "serviceBaseUri");
}
if (maxDepth <= 0)
{
throw new ArgumentException(Strings.SyntacticTree_MaxDepthInvalid, "maxDepth");
}
UriPathParser pathParser = new UriPathParser(maxDepth);
var path = pathParser.ParsePathIntoSegments(queryUri, serviceBaseUri);
List <CustomQueryOptionToken> queryOptions = UriUtils.ParseQueryOptions(queryUri);
QueryToken filter = null;
string filterQuery = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.FilterQueryOption);
if (filterQuery != null)
{
UriQueryExpressionParser expressionParser = new UriQueryExpressionParser(maxDepth);
filter = expressionParser.ParseFilter(filterQuery);
}
IEnumerable <OrderByToken> orderByTokens = null;
string orderByQuery = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.OrderByQueryOption);
if (orderByQuery != null)
{
UriQueryExpressionParser expressionParser = new UriQueryExpressionParser(maxDepth);
orderByTokens = expressionParser.ParseOrderBy(orderByQuery);
}
SelectToken select = null;
string selectQuery = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.SelectQueryOption);
if (selectQuery != null)
{
ISelectExpandTermParser selectParser = SelectExpandTermParserFactory.Create(selectQuery);
select = selectParser.ParseSelect();
}
ExpandToken expand = null;
string expandQuery = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.ExpandQueryOption);
if (expandQuery != null)
{
ISelectExpandTermParser expandParser = SelectExpandTermParserFactory.Create(expandQuery);
expand = expandParser.ParseExpand();
}
int? skip = null;
string skipQuery = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.SkipQueryOption);
if (skipQuery != null)
{
int skipValue;
if (!UriPrimitiveTypeParser.TryUriStringToNonNegativeInteger(skipQuery, out skipValue))
{
throw new ODataException(Strings.SyntacticTree_InvalidSkipQueryOptionValue(skipQuery));
}
skip = skipValue;
}
int? top = null;
string topQuery = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.TopQueryOption);
if (topQuery != null)
{
int topValue;
if (!UriPrimitiveTypeParser.TryUriStringToNonNegativeInteger(topQuery, out topValue))
{
throw new ODataException(Strings.SyntacticTree_InvalidTopQueryOptionValue(topQuery));
}
top = topValue;
}
string inlineCountQuery = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.InlineCountQueryOption);
InlineCountKind?inlineCount = QueryTokenUtils.ParseInlineCountKind(inlineCountQuery);
string format = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.FormatQueryOption);
return(new SyntacticTree(
path,
filter,
orderByTokens,
select,
expand,
skip,
top,
inlineCount,
format,
queryOptions.Count == 0 ? null : new ReadOnlyCollection <CustomQueryOptionToken>(queryOptions)));
}
