/// <summary>
/// Creates an operation response message that can be used to write the operation content to.
/// </summary>
/// <param name="outputStream">The output stream underlying the operation message.</param>
/// <param name="operationListener">The operation listener.</param>
/// <param name="urlResolver">The (optional) URL resolver for the message to create.</param>
/// <returns>An <see cref="ODataBatchOperationResponseMessage"/> that can be used to write the operation content.</returns>
internal static ODataBatchOperationResponseMessage CreateWriteMessage(
Stream outputStream,
IODataBatchOperationListener operationListener,
IODataUrlResolver urlResolver)
{
Func <Stream> streamCreatorFunc = () => ODataBatchUtils.CreateBatchOperationWriteStream(outputStream, operationListener);
return(new ODataBatchOperationResponseMessage(streamCreatorFunc, /*headers*/ null, operationListener, /*contentId*/ null, urlResolver, /*writing*/ true));
}
/// <summary>
/// Parses the request line of a batch operation request.
/// </summary>
/// <param name="requestLine">The request line as a string.</param>
/// <param name="httpMethod">The parsed HTTP method of the request.</param>
/// <param name="requestUri">The parsed <see cref="Uri"/> of the request.</param>
private void ParseRequestLine(string requestLine, out string httpMethod, out Uri requestUri)
{
Debug.Assert(!this.inputContext.ReadingResponse, "Must only be called for requests.");
// Batch Request: POST /Customers HTTP/1.1
// Since the uri can contain spaces, the only way to read the request url, is to
// check for first space character and last space character and anything between
// them.
int firstSpaceIndex = requestLine.IndexOf(' ');
// Check whether there are enough characters after the first space for the 2nd and 3rd segments
// (and a whitespace in between)
if (firstSpaceIndex <= 0 || requestLine.Length - 3 <= firstSpaceIndex)
{
// only 1 segment or empty first segment or not enough left for 2nd and 3rd segments
throw new ODataException(Strings.ODataBatchReaderStream_InvalidRequestLine(requestLine));
}
int lastSpaceIndex = requestLine.LastIndexOf(' ');
if (lastSpaceIndex < 0 || lastSpaceIndex - firstSpaceIndex - 1 <= 0 || requestLine.Length - 1 <= lastSpaceIndex)
{
// only 2 segments or empty 2nd or 3rd segments
// only 1 segment or empty first segment or not enough left for 2nd and 3rd segments
throw new ODataException(Strings.ODataBatchReaderStream_InvalidRequestLine(requestLine));
}
httpMethod = requestLine.Substring(0, firstSpaceIndex); // Request - Http method
string uriSegment = requestLine.Substring(firstSpaceIndex + 1, lastSpaceIndex - firstSpaceIndex - 1); // Request - Request uri
string httpVersionSegment = requestLine.Substring(lastSpaceIndex + 1); // Request - Http version
// Validate HttpVersion
if (string.CompareOrdinal(ODataConstants.HttpVersionInBatching, httpVersionSegment) != 0)
{
throw new ODataException(Strings.ODataBatchReaderStream_InvalidHttpVersionSpecified(httpVersionSegment, ODataConstants.HttpVersionInBatching));
}
// NOTE: this method will throw if the method is not recognized.
HttpUtils.ValidateHttpMethod(httpMethod);
// Validate the HTTP method when reading a request
if (this.batchStream.ChangeSetBoundary != null)
{
// allow all methods except for GET
if (HttpUtils.IsQueryMethod(httpMethod))
{
throw new ODataException(Strings.ODataBatch_InvalidHttpMethodForChangeSetRequest(httpMethod));
}
}
requestUri = new Uri(uriSegment, UriKind.RelativeOrAbsolute);
requestUri = ODataBatchUtils.CreateOperationRequestUri(requestUri, this.inputContext.MessageReaderSettings.BaseUri, this.urlResolver);
}
/// <summary>
/// Creates an operation request message that can be used to write the operation content to.
/// </summary>
/// <param name="outputStream">The output stream underlying the operation message.</param>
/// <param name="method">The HTTP method to use for the message to create.</param>
/// <param name="requestUrl">The request URL for the message to create.</param>
/// <param name="operationListener">The operation listener.</param>
/// <param name="urlResolver">The (optional) URL resolver for the message to create.</param>
/// <returns>An <see cref="ODataBatchOperationRequestMessage"/> to write the request content to.</returns>
internal static ODataBatchOperationRequestMessage CreateWriteMessage(
Stream outputStream,
string method,
Uri requestUrl,
IODataBatchOperationListener operationListener,
IODataUrlResolver urlResolver)
{
Debug.Assert(outputStream != null, "outputStream != null");
Debug.Assert(operationListener != null, "operationListener != null");
Func <Stream> streamCreatorFunc = () => ODataBatchUtils.CreateBatchOperationWriteStream(outputStream, operationListener);
return(new ODataBatchOperationRequestMessage(streamCreatorFunc, method, requestUrl, /*headers*/ null, operationListener, /*contentId*/ null, urlResolver, /*writing*/ true));
}
/// <summary>
/// Creates an operation request message that can be used to read the operation content from.
/// </summary>
/// <param name="batchReaderStream">The batch stream underyling the operation response message.</param>
/// <param name="method">The HTTP method to use for the message to create.</param>
/// <param name="requestUrl">The request URL for the message to create.</param>
/// <param name="headers">The headers to use for the operation request message.</param>
/// <param name="operationListener">The operation listener.</param>
/// <param name="contentId">The content-ID for the operation request message.</param>
/// <param name="urlResolver">The (optional) URL resolver for the message to create.</param>
/// <returns>An <see cref="ODataBatchOperationRequestMessage"/> to read the request content from.</returns>
internal static ODataBatchOperationRequestMessage CreateReadMessage(
ODataBatchReaderStream batchReaderStream,
string method,
Uri requestUrl,
ODataBatchOperationHeaders headers,
IODataBatchOperationListener operationListener,
string contentId,
IODataUrlResolver urlResolver)
{
Debug.Assert(batchReaderStream != null, "batchReaderStream != null");
Debug.Assert(operationListener != null, "operationListener != null");
Func <Stream> streamCreatorFunc = () => ODataBatchUtils.CreateBatchOperationReadStream(batchReaderStream, headers, operationListener);
return(new ODataBatchOperationRequestMessage(streamCreatorFunc, method, requestUrl, headers, operationListener, contentId, urlResolver, /*writing*/ false));
}
/// <summary>
/// Creates an operation response message that can be used to read the operation content from.
/// </summary>
/// <param name="batchReaderStream">The batch stream underyling the operation response message.</param>
/// <param name="statusCode">The status code to use for the operation response message.</param>
/// <param name="headers">The headers to use for the operation response message.</param>
/// <param name="contentId">The content-ID for the operation response message.</param>
/// <param name="operationListener">The operation listener.</param>
/// <param name="urlResolver">The (optional) URL resolver for the message to create.</param>
/// <returns>An <see cref="ODataBatchOperationResponseMessage"/> that can be used to read the operation content.</returns>
internal static ODataBatchOperationResponseMessage CreateReadMessage(
ODataBatchReaderStream batchReaderStream,
int statusCode,
ODataBatchOperationHeaders headers,
string contentId,
IODataBatchOperationListener operationListener,
IODataUrlResolver urlResolver)
{
Debug.Assert(batchReaderStream != null, "batchReaderStream != null");
Debug.Assert(operationListener != null, "operationListener != null");
Func <Stream> streamCreatorFunc = () => ODataBatchUtils.CreateBatchOperationReadStream(batchReaderStream, headers, operationListener);
ODataBatchOperationResponseMessage responseMessage =
new ODataBatchOperationResponseMessage(streamCreatorFunc, headers, operationListener, contentId, urlResolver, /*writing*/ false);
responseMessage.statusCode = statusCode;
return(responseMessage);
}
/// <summary>
/// Reads a line (all bytes until a line feed) from the underlying stream.
/// </summary>
/// <returns>Returns the string that was read from the underyling stream (not including a terminating line feed), or null if the end of input was reached.</returns>
private string ReadLine()
{
Debug.Assert(this.batchEncoding != null, "Batch encoding should have been established on first call to SkipToBoundary.");
Debug.Assert(this.lineBuffer != null && this.lineBuffer.Length == LineBufferLength, "Line buffer should have been created.");
// The number of bytes in the line buffer that make up the line.
int lineBufferSize = 0;
// Start with the pre-allocated line buffer array.
byte[] bytesForString = this.lineBuffer;
ODataBatchReaderStreamScanResult scanResult = ODataBatchReaderStreamScanResult.NoMatch;
while (scanResult != ODataBatchReaderStreamScanResult.Match)
{
int byteCount, lineEndStartPosition, lineEndEndPosition;
scanResult = this.batchBuffer.ScanForLineEnd(out lineEndStartPosition, out lineEndEndPosition);
switch (scanResult)
{
case ODataBatchReaderStreamScanResult.NoMatch:
// Copy all the bytes in the batchBuffer into the result byte[] and then continue
byteCount = this.batchBuffer.NumberOfBytesInBuffer;
if (byteCount > 0)
{
// TODO: [Design] Consider security limits for data being read
ODataBatchUtils.EnsureArraySize(ref bytesForString, lineBufferSize, byteCount);
Buffer.BlockCopy(this.batchBuffer.Bytes, this.batchBuffer.CurrentReadPosition, bytesForString, lineBufferSize, byteCount);
lineBufferSize += byteCount;
}
if (this.underlyingStreamExhausted)
{
if (lineBufferSize == 0)
{
// If there's nothing more to pull from the underlying stream, and we didn't read anything
// in this invocation of ReadLine(), return null to indicate end of input.
return(null);
}
// Nothing more to read; stop looping
scanResult = ODataBatchReaderStreamScanResult.Match;
this.batchBuffer.SkipTo(this.batchBuffer.CurrentReadPosition + byteCount);
}
else
{
this.underlyingStreamExhausted = this.batchBuffer.RefillFrom(this.inputContext.Stream, /*preserveFrom*/ ODataBatchReaderStreamBuffer.BufferLength);
}
break;
case ODataBatchReaderStreamScanResult.PartialMatch:
// We found the start of a line end in the buffer but could not verify whether we saw all of it.
// This can happen if a line end is represented as \r\n and we found \r at the very last position in the buffer.
// In this case we copy the bytes into the result byte[] and continue at the start of the line end; this will guarantee
// that the next scan will find the full line end, not find any additional bytes and then skip the full line end.
// It is safe to copy the string right here because we will also accept \r as a line end; we are just not sure whether there
// will be a subsequent \n.
// This can also happen if the last byte in the stream is \r.
byteCount = lineEndStartPosition - this.batchBuffer.CurrentReadPosition;
if (byteCount > 0)
{
ODataBatchUtils.EnsureArraySize(ref bytesForString, lineBufferSize, byteCount);
Buffer.BlockCopy(this.batchBuffer.Bytes, this.batchBuffer.CurrentReadPosition, bytesForString, lineBufferSize, byteCount);
lineBufferSize += byteCount;
}
if (this.underlyingStreamExhausted)
{
// Nothing more to read; stop looping
scanResult = ODataBatchReaderStreamScanResult.Match;
this.batchBuffer.SkipTo(lineEndStartPosition + 1);
}
else
{
this.underlyingStreamExhausted = this.batchBuffer.RefillFrom(this.inputContext.Stream, /*preserveFrom*/ lineEndStartPosition);
}
break;
case ODataBatchReaderStreamScanResult.Match:
// We found a line end in the buffer
Debug.Assert(lineEndStartPosition >= this.batchBuffer.CurrentReadPosition, "Line end must be at or after current position.");
Debug.Assert(lineEndEndPosition < this.batchBuffer.CurrentReadPosition + this.batchBuffer.NumberOfBytesInBuffer, "Line end must finish withing buffer range.");
byteCount = lineEndStartPosition - this.batchBuffer.CurrentReadPosition;
if (byteCount > 0)
{
ODataBatchUtils.EnsureArraySize(ref bytesForString, lineBufferSize, byteCount);
Buffer.BlockCopy(this.batchBuffer.Bytes, this.batchBuffer.CurrentReadPosition, bytesForString, lineBufferSize, byteCount);
lineBufferSize += byteCount;
}
this.batchBuffer.SkipTo(lineEndEndPosition + 1);
break;
default:
throw new ODataException(Strings.General_InternalError(InternalErrorCodes.ODataBatchReaderStream_ReadLine));
}
}
Debug.Assert(bytesForString != null, "bytesForString != null");
return(this.CurrentEncoding.GetString(bytesForString, 0, lineBufferSize));
}