public Task Invoke(IDictionary<string, object> env)
{
var request = new OwinRequest(env);
var response = new OwinResponse(env);
var requestPath = Uri.UnescapeDataString(request.Path);
var songs = DataManager.ActualSongStorage;
if (requestPath.StartsWith("/songs/"))
{
string query = requestPath.Substring("/songs/".Length);
if (query == "list")
{
if (request.Method != "GET")
return response.RespondMethodNotAllowed();
return response.RespondCompressedString(JsonConvert.SerializeObject(songs.All()), "application/json");
}
else if (query == "count")
{
if (request.Method != "GET")
return response.RespondMethodNotAllowed();
return response.RespondString(songs.Count().ToString());
}
else if (query.StartsWith("filter/"))
{
if (request.Method != "GET")
return response.RespondMethodNotAllowed();
query = query.Substring("filter/".Length);
var i = query.IndexOf('/');
if (i < 0)
return response.RespondNotFound();
var filter = query.Substring(0, i);
var filterQuery = SongData.NormalizeSearchString(query.Substring(i + 1));
if (filter == "text")
{
return response.RespondCompressedString(JsonConvert.SerializeObject(songs.WhereTextContains(filterQuery)), "application/json");
}
else if (filter == "title")
{
return response.RespondCompressedString(JsonConvert.SerializeObject(songs.WhereTitleContains(filterQuery)), "application/json");
}
else if (filter == "source")
{
return response.RespondCompressedString(JsonConvert.SerializeObject(songs.WhereSourceContains(filterQuery)), "application/json");
}
else if (filter == "copyright")
{
return response.RespondCompressedString(JsonConvert.SerializeObject(songs.WhereCopyrightContains(filterQuery)), "application/json");
}
else
{
return response.RespondNotFound(); // unsupported filter method
}
}
else
{
if (request.Method == "GET")
{
return RespondGetSong(response, songs, query);
}
else if (request.Method == "PUT")
{
return RespondPutSong(request, response, songs, query);
}
else if (request.Method == "DELETE")
{
try
{
songs.Delete(query);
return TaskHelpers.Completed();
}
catch (FileNotFoundException)
{
return response.RespondNotFound();
}
}
else
{
return response.RespondMethodNotAllowed();
}
}
}
else
{
return next(env);
}
}
