Exemplo n.º 1
0
        /// <summary>
        /// Parses a section of the stream that is known to be parameter data.
        /// </summary>
        /// <param name="parameters">
        /// The header parameters of this section. "name" must be a valid key.
        /// </param>
        /// <param name="reader">
        /// The StreamReader to read the data from
        /// </param>
        /// <returns>
        /// The <see cref="ParameterPart"/> containing the parsed data (name, value).
        /// </returns>
        /// <exception cref="MultipartParseException">
        /// thrown if unexpected data is found such as running out of stream before hitting the boundary.
        /// </exception>
        private ParameterPart ParseParameterPart(Dictionary <string, string> parameters, RebufferableBinaryReader reader)
        {
            // Our job is to get the actual "data" part of the parameter and construct
            // an actual ParameterPart object with it. All we need to do is read data into a string
            // untill we hit the boundary
            var    data      = new StringBuilder();
            bool   firstTime = true;
            string line      = reader.ReadLine();

            while (line != this.boundary && line != this.endBoundary)
            {
                if (line == null)
                {
                    throw new MultipartParseException("Unexpected end of section");
                }

                if (firstTime)
                {
                    data.Append(line);
                    firstTime = false;
                }
                else
                {
                    data.Append(Environment.NewLine);
                    data.Append(line);
                }
                line = reader.ReadLine();
            }

            if (line == this.endBoundary)
            {
                this.readEndBoundary = true;
            }

            // If we're here we've hit the boundary and have the data!
            var part = new ParameterPart(parameters["name"], data.ToString());

            return(part);
        }
Exemplo n.º 2
0
        /// <summary>
        /// Parses the header of the next section of the multipart stream and
        ///     determines if it contains file data or parameter data.
        /// </summary>
        /// <param name="reader">
        /// The StreamReader to read data from.
        /// </param>
        /// <exception cref="MultipartParseException">
        /// thrown if unexpected data is hit such as end of stream.
        /// </exception>
        private void ParseSection(RebufferableBinaryReader reader)
        {
            // Our first job is to determine what type of section this is: form data or file.
            // This is a bit tricky because files can still be encoded with Content-Disposition: form-data
            // in the case of single file uploads. Multi-file uploads have Content-Disposition: file according
            // to the spec however in practise it seems that multiple files will be represented by
            // multiple Content-Disposition: form-data files.
            var parameters = new Dictionary <string, string>();

            string line = reader.ReadLine();

            while (line != string.Empty)
            {
                if (line == null)
                {
                    throw new MultipartParseException("Unexpected end of stream");
                }

                if (line == this.boundary || line == this.endBoundary)
                {
                    throw new MultipartParseException("Unexpected end of section");
                }


                // This line parses the header values into a set of key/value pairs. For example:
                // Content-Disposition: form-data; name="textdata"
                // ["content-disposition"] = "form-data"
                // ["name"] = "textdata"
                // Content-Disposition: form-data; name="file"; filename="data.txt"
                // ["content-disposition"] = "form-data"
                // ["name"] = "file"
                // ["filename"] = "data.txt"
                // Content-Type: text/plain
                // ["content-type"] = "text/plain"
                var values = SplitBySemicolonIgnoringSemicolonsInQuotes(line)
                             .Select(x => x.Split(new[] { ':', '=' }, 2)) // Limit split to 2 splits so we don't accidently split characters in file paths.
                             .ToDictionary(
                    x => x[0].Trim().Replace("\"", string.Empty).ToLower(),
                    x => x[1].Trim().Replace("\"", string.Empty));


                // Here we just want to push all the values that we just retrieved into the
                // parameters dictionary.
                try
                {
                    foreach (var pair in values)
                    {
                        parameters.Add(pair.Key, pair.Value);
                    }
                }
                catch (ArgumentException)
                {
                    throw new MultipartParseException("Duplicate field in section");
                }

                line = reader.ReadLine();
            }

            // Now that we've consumed all the parameters we're up to the body. We're going to do
            // different things depending on if we're parsing a, relatively small, form value or a
            // potentially large file.
            if (parameters.ContainsKey("filename"))
            {
                // Right now we assume that if a section contains filename then it is a file.
                // This assumption needs to be checked, it holds true in firefox but is untested for other
                // browsers.
                FilePart part = this.ParseFilePart(parameters, reader);
                this.Files.Add(part);
            }
            else
            {
                ParameterPart part = this.ParseParameterPart(parameters, reader);
                this.Parameters.Add(part.Name, part);
            }
        }