private IEnumerable <LinkDto> CreateBoardsLinks(BoardsParams boardsParams, bool hasPrevious, bool hasNext)
{
var links = new List <LinkDto>();
links.Add(
new LinkDto(CreateBoardResourceUri(boardsParams, UriTypeEnum.Current),
"self",
"GET"));
if (hasNext)
{
links.Add(
new LinkDto(CreateBoardResourceUri(boardsParams, UriTypeEnum.NextPage),
"nextPage",
"GET")
);
}
if (hasPrevious)
{
links.Add(
new LinkDto(CreateBoardResourceUri(boardsParams, UriTypeEnum.PreviousPage),
"previousPage",
"GET")
);
}
return(links);
}
private string CreateBoardResourceUri(BoardsParams uriParams, UriTypeEnum uriType)
{
switch (uriType)
{
case UriTypeEnum.PreviousPage:
return(Url.Link("GetBoards",
new
{
pageNumber = uriParams.PageNumber - 1,
pageSize = uriParams.PageSize
}));
case UriTypeEnum.NextPage:
return(Url.Link("GetBoards",
new
{
pageNumber = uriParams.PageNumber + 1,
pageSize = uriParams.PageSize
}));
case UriTypeEnum.Current:
default:
return(Url.Link("GetBoards",
new
{
pageNumber = uriParams.PageNumber,
pageSize = uriParams.PageSize
}));
}
}
public async Task <PagedList <Board> > GetBoardsAsync(BoardsParams boardsParams)
{
var collection = await _boardRepository.GetBoardsAsync();
var pagedList = PagedList <Board> .Create(collection, boardsParams.PageNumber, boardsParams.PageSize);
return(pagedList);
}
//[Produces("application/json", "application/xml", "application/vnd.restwall.hateoas+json")]
public async Task <ActionResult> GetBoardsAsync([FromQuery] BoardsParams boardsParams, [FromHeader(Name = "Accept")] string mediaType)
{
if (!MediaTypeHeaderValue.TryParse(mediaType, out MediaTypeHeaderValue parsedMediaType))
{
return(BadRequest());
}
var boards = await _boardService.GetBoardsAsync(boardsParams);
if (boards == null)
{
return(NotFound());
}
if (!boards.Any())
{
return(NotFound());
}
var previousPageLink = boards.HasPrevious ? CreateBoardResourceUri(boardsParams, UriTypeEnum.PreviousPage) : null;
var nextPageLink = boards.HasNext ? CreateBoardResourceUri(boardsParams, UriTypeEnum.NextPage) : null;
var paginationMetaData = new
{
totalCount = boards.TotalCount,
pageSize = boards.PageSize,
currentPage = boards.CurrentPage,
totalPages = boards.TotalPages,
previousPageLink,
nextPageLink
};
var paginationMetaDataJson = System.Text.Json.JsonSerializer.Serialize(paginationMetaData);
Response.Headers.Add("X-Pagination", paginationMetaDataJson);
var includeLinks = parsedMediaType.SubTypeWithoutSuffix.EndsWith("hateoas", StringComparison.InvariantCultureIgnoreCase);
if (includeLinks)
{
var boardsWithLinks = new List <ResponseBoardLinksDto>();
foreach (var item in boards)
{
IEnumerable <LinkDto> links = new List <LinkDto>();
links = CreateBoardLinks(item.Id);
var boardWithLinks = _mapper.Map <ResponseBoardLinksDto>(item);
boardWithLinks.Links = links;
boardsWithLinks.Add(boardWithLinks);
}
var envelopeWithLinks = new EnvelopeResponseBoardLinksDto();
envelopeWithLinks.Value = boardsWithLinks;
envelopeWithLinks.Links = CreateBoardsLinks(boardsParams, boards.HasPrevious, boards.HasNext);
return(Ok(envelopeWithLinks));
}
var responseDtos = _mapper.Map <IEnumerable <ResponseBoardDto> >(boards);
return(Ok(responseDtos));
}
