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Lidarr/NzbDrone.Api/REST/RestModule.cs

217 lines
7.2 KiB

using System;
using System.Collections.Generic;
using AutoMapper;
using FluentValidation;
using Nancy;
using NzbDrone.Api.Extensions;
using System.Linq;
using NzbDrone.Core.Datastore;
namespace NzbDrone.Api.REST
{
public abstract class RestModule<TResource> : NancyModule
where TResource : RestResource, new()
{
private const string ROOT_ROUTE = "/";
private const string ID_ROUTE = @"/(?<id>[\d]{1,7})";
private Action<int> _deleteResource;
private Func<int, TResource> _getResourceById;
private Func<List<TResource>> _getResourceAll;
private Func<PagingResource<TResource>, PagingResource<TResource>> _getResourcePaged;
private Func<TResource> _getResourceSingle;
private Func<TResource, TResource> _createResource;
private Func<TResource, TResource> _updateResource;
protected ResourceValidator<TResource> PostValidator { get; private set; }
protected ResourceValidator<TResource> PutValidator { get; private set; }
protected ResourceValidator<TResource> SharedValidator { get; private set; }
protected void ValidateId(int id)
{
if (id <= 0)
{
throw new BadRequestException(id + " is not a valid ID");
}
}
protected RestModule(string modulePath)
: base(modulePath)
{
PostValidator = new ResourceValidator<TResource>();
PutValidator = new ResourceValidator<TResource>();
SharedValidator = new ResourceValidator<TResource>();
}
protected Action<int> DeleteResource
{
private get { return _deleteResource; }
set
{
_deleteResource = value;
Delete[ID_ROUTE] = options =>
{
ValidateId(options.Id);
DeleteResource((int)options.Id);
return new Response { StatusCode = HttpStatusCode.OK };
};
}
}
protected Func<int, TResource> GetResourceById
{
private get { return _getResourceById; }
set
{
_getResourceById = value;
Get[ID_ROUTE] = options =>
{
ValidateId(options.Id);
var resource = GetResourceById((int)options.Id);
return resource.AsResponse();
};
}
}
protected Func<List<TResource>> GetResourceAll
{
private get { return _getResourceAll; }
set
{
_getResourceAll = value;
Get[ROOT_ROUTE] = options =>
{
var resource = GetResourceAll();
return resource.AsResponse();
};
}
}
protected Func<PagingResource<TResource>, PagingResource<TResource>> GetResourcePaged
{
private get { return _getResourcePaged; }
set
{
_getResourcePaged = value;
Get[ROOT_ROUTE] = options =>
{
var resource = GetResourcePaged(ReadPagingResourceFromRequest());
return resource.AsResponse();
};
}
}
protected Func<TResource> GetResourceSingle
{
private get { return _getResourceSingle; }
set
{
_getResourceSingle = value;
Get[ROOT_ROUTE] = options =>
{
var resource = GetResourceSingle();
return resource.AsResponse();
};
}
}
protected Func<TResource, TResource> CreateResource
{
private get { return _createResource; }
set
{
_createResource = value;
Post[ROOT_ROUTE] = options =>
{
var resource = CreateResource(ReadFromRequest());
return resource.AsResponse(HttpStatusCode.Created);
};
}
}
protected Func<TResource, TResource> UpdateResource
{
private get { return _updateResource; }
set
{
_updateResource = value;
Put[ROOT_ROUTE] = options =>
{
var resource = UpdateResource(ReadFromRequest());
return resource.AsResponse(HttpStatusCode.Accepted);
};
Put[ID_ROUTE] = options =>
{
var model = ReadFromRequest();
model.Id = options.Id;
var resource = UpdateResource(model);
return resource.AsResponse(HttpStatusCode.Accepted);
};
}
}
private TResource ReadFromRequest()
{
//TODO: handle when request is null
var resource = Request.Body.FromJson<TResource>();
if (resource == null)
{
throw new BadRequestException("Request body can't be empty");
}
var errors = SharedValidator.Validate(resource).Errors.ToList();
if (Request.Method.Equals("POST", StringComparison.InvariantCultureIgnoreCase))
{
errors.AddRange(PostValidator.Validate(resource).Errors);
}
else if (Request.Method.Equals("PUT", StringComparison.InvariantCultureIgnoreCase))
{
errors.AddRange(PutValidator.Validate(resource).Errors);
}
if (errors.Any())
{
throw new ValidationException(errors);
}
return resource;
}
private PagingResource<TResource> ReadPagingResourceFromRequest()
{
int pageSize;
Int32.TryParse(PrimitiveExtensions.ToNullSafeString(Request.Query.PageSize), out pageSize);
if (pageSize == 0) pageSize = 10;
int page;
Int32.TryParse(PrimitiveExtensions.ToNullSafeString(Request.Query.Page), out page);
if (page == 0) page = 1;
var sortKey = PrimitiveExtensions.ToNullSafeString(Request.Query.SortKey);
if (String.IsNullOrEmpty(sortKey)) sortKey = "AirDate";
var sortDirection = PrimitiveExtensions.ToNullSafeString(Request.Query.SortDir)
.Equals("Asc", StringComparison.InvariantCultureIgnoreCase)
? SortDirection.Ascending
: SortDirection.Descending;
var pagingResource = new PagingResource<TResource>
{
PageSize = pageSize,
Page = page,
SortKey = sortKey,
SortDirection = sortDirection
};
return pagingResource;
}
}
}