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));
}
}