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117 lines
3.8 KiB
117 lines
3.8 KiB
using System;
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using System.IO;
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using System.Linq;
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using System.Net;
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using System.Net.Http;
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using System.Threading.Tasks;
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using System.Xml.Linq;
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using System.Xml.Serialization;
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namespace Hqub.MusicBrainz.API
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{
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internal static class WebRequestHelper
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{
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private const string WebServiceUrl = "http://musicbrainz.org/ws/2/";
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private const string LookupTemplate = "{0}/{1}/?inc={2}";
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private const string BrowseTemplate = "{0}?{1}={2}&limit={3}&offset={4}&inc={5}";
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private const string SearchTemplate = "{0}?query={1}&limit={2}&offset={3}";
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internal async static Task<T> GetAsync<T>(string url, bool withoutMetadata = true) where T : Entities.Entity
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{
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try
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{
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var client = CreateHttpClient(true, Configuration.Proxy);
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return DeserializeStream<T>(await client.GetStreamAsync(url), withoutMetadata);
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}
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catch (Exception e)
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{
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if (Configuration.GenerateCommunicationThrow)
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{
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throw e;
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}
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}
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return default(T);
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}
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/// <summary>
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/// Creates a webservice lookup template.
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/// </summary>
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internal static string CreateLookupUrl(string entity, string mbid, string inc)
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{
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return string.Format("{0}{1}", WebServiceUrl, string.Format(LookupTemplate, entity, mbid, inc));
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}
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/// <summary>
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/// Creates a webservice browse template.
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/// </summary>
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internal static string CreateBrowseTemplate(string entity, string relatedEntity, string mbid, int limit, int offset, string inc)
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{
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return string.Format("{0}{1}", WebServiceUrl, string.Format(BrowseTemplate, entity, relatedEntity, mbid, limit, offset, inc));
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}
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/// <summary>
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/// Creates a webservice search template.
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/// </summary>
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internal static string CreateSearchTemplate(string entity, string query, int limit, int offset)
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{
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query = Uri.EscapeUriString(query);
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return string.Format("{0}{1}", WebServiceUrl, string.Format(SearchTemplate, entity, query, limit, offset));
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}
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internal static T DeserializeStream<T>(Stream stream, bool withoutMetadata) where T : Entities.Entity
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{
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if (stream == null)
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{
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throw new NullReferenceException(Resources.Messages.EmptyStream);
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}
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var xml = XDocument.Load(stream);
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var serialize = new XmlSerializer(typeof(T));
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//Add extension namespace:
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var ns = new XmlSerializerNamespaces();
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ns.Add("ext", "http://musicbrainz.org/ns/ext#-2.0");
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//check valid xml schema:
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if (xml.Root == null || xml.Root.Name.LocalName != "metadata")
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{
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throw new NullReferenceException(Resources.Messages.WrongResponseFormat);
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}
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var node = withoutMetadata ? xml.Root.Elements().FirstOrDefault() : xml.Root;
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if (node == null)
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{
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return default(T);
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}
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return (T)serialize.Deserialize(node.CreateReader());
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}
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private static HttpClient CreateHttpClient(bool automaticDecompression = true, IWebProxy proxy = null)
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{
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var handler = new HttpClientHandler();
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if (proxy != null)
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{
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handler.Proxy = proxy;
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handler.UseProxy = true;
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}
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if (automaticDecompression)
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{
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handler.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
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}
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var client = new HttpClient(handler);
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client.DefaultRequestHeaders.Add("User-Agent", Configuration.UserAgent);
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return client;
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}
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}
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}
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