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Merge pull request #36 from nsip/release-14
Created a custom JSON Formatter which complies with Goessner notation
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Code/Sif3Framework/Sif.Framework/WebApi/MediaTypeFormatters/XmlToJsonFormatter.cs
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|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| /* | ||
| * Copyright 2020 Systemic Pty Ltd | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| using Newtonsoft.Json; | ||
| using System; | ||
| using System.IO; | ||
| using System.Linq; | ||
| using System.Net; | ||
| using System.Net.Http; | ||
| using System.Net.Http.Formatting; | ||
| using System.Net.Http.Headers; | ||
| using System.Threading.Tasks; | ||
| using System.Xml; | ||
| using System.Xml.Linq; | ||
| using System.Xml.Serialization; | ||
|
|
||
| namespace Sif.Framework.WebApi.MediaTypeFormatters | ||
| { | ||
| /// <summary> | ||
| /// XML-based MediaTypeFormatter that serialises an object to XML and then JSON, and deserialises JSON to XML and | ||
| /// then an object. | ||
| /// </summary> | ||
| public class XmlToJsonFormatter : XmlMediaTypeFormatter | ||
| { | ||
| /// <summary> | ||
| /// Create an instance of this formatter. | ||
| /// </summary> | ||
| public XmlToJsonFormatter() | ||
| { | ||
| SupportedMediaTypes.Clear(); | ||
| SupportedMediaTypes.Add(new MediaTypeHeaderValue("application/json")); | ||
| SupportedMediaTypes.Add(new MediaTypeHeaderValue("text/json")); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// <see cref="MediaTypeFormatter.ReadFromStreamAsync(Type, Stream, HttpContent, IFormatterLogger)"/> | ||
| /// </summary> | ||
| public override Task<object> ReadFromStreamAsync( | ||
| Type type, | ||
| Stream readStream, | ||
| HttpContent content, | ||
| IFormatterLogger formatterLogger) | ||
| { | ||
| if (type == null) throw new ArgumentNullException(nameof(type)); | ||
|
|
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| if (readStream == null) throw new ArgumentNullException(nameof(readStream)); | ||
|
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| object value = null; | ||
|
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| using (StreamReader streamReader = new StreamReader(readStream)) | ||
| { | ||
| string json = streamReader.ReadToEnd(); | ||
|
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| // If there is JSON data, deserialise into an object. | ||
| if (!string.IsNullOrWhiteSpace(json)) | ||
| { | ||
| // Convert the JSON string into an XML document. | ||
| XmlDocument xmlDocument = JsonConvert.DeserializeXmlNode(json); | ||
|
|
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| using (XmlReader xmlReader = new XmlNodeReader(xmlDocument)) | ||
| { | ||
| // Deserialise the XML document into an object. | ||
| XmlSerializer xmlSerializer = (XmlSerializer)GetDeserializer(type, content); | ||
| value = xmlSerializer.Deserialize(xmlReader); | ||
| } | ||
| } | ||
| } | ||
|
|
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| return Task.FromResult(value); | ||
| } | ||
|
|
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| /// <summary> | ||
| /// <see cref="MediaTypeFormatter.WriteToStreamAsync(Type, object, Stream, HttpContent, TransportContext)"/> | ||
| /// </summary> | ||
| public override Task WriteToStreamAsync( | ||
| Type type, | ||
| object value, | ||
| Stream writeStream, | ||
| HttpContent content, | ||
| TransportContext transportContext) | ||
| { | ||
| if (type == null) throw new ArgumentNullException(nameof(type)); | ||
|
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| if (writeStream == null) throw new ArgumentNullException(nameof(writeStream)); | ||
|
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| string xml; | ||
|
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| using (StringWriter stringWriter = new StringWriter()) | ||
| { | ||
| using (XmlWriter xmlWriter = XmlWriter.Create(stringWriter)) | ||
| { | ||
| // Serialise the object into an XML string. | ||
| XmlSerializer xmlSerialiser = (XmlSerializer)GetSerializer(type, value, content); | ||
| xmlSerialiser.Serialize(xmlWriter, value); | ||
| xml = stringWriter.ToString(); | ||
| } | ||
| } | ||
|
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||
| // Parse the XML string and remove empty elements (defined by the "xsi:nil" element). | ||
| XElement xElement = XElement.Parse(xml); | ||
| xElement | ||
| .Descendants() | ||
| .Where(x => | ||
| string.IsNullOrEmpty(x.Value) && | ||
| x.Attributes().Where(y => y.Name.LocalName == "nil" && y.Value == "true").Count() > 0) | ||
| .Remove(); | ||
| xml = xElement.ToString(); | ||
|
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| // Convert the XML document into a JSON string. | ||
| XmlDocument xmlDocument = new XmlDocument(); | ||
| xmlDocument.LoadXml(xml); | ||
| string json = JsonConvert.SerializeXmlNode(xmlDocument); | ||
|
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| // Write the JSON string to the stream. | ||
| byte[] buf = System.Text.Encoding.Default.GetBytes(json); | ||
| writeStream.Write(buf, 0, buf.Length); | ||
| writeStream.Flush(); | ||
|
|
||
| return Task.FromResult(writeStream); | ||
| } | ||
| } | ||
| } |
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