public Ret <Entity> ExecuteAndRenderResult(HttpContext httpContext)
{
var action = (string)httpContext.Request.Query["action"];
if (string.IsNullOrWhiteSpace(action))
{
var self = httpContext.Request.GetRequestUri();
var entity = HttpEntity.Create(self, HttpStatusCode.BadRequest,
$"Nenhuma ação foi indicada. Faltou definir o parâmetro \"action\"?"
);
return(entity);
}
var method = PaperType.GetMethodIgnoreCase(action);
if (method == null)
{
var self = httpContext.Request.GetRequestUri();
var entity = HttpEntity.Create(self, HttpStatusCode.NotImplemented,
$"A ação solicitada não está disponível: \"{action}\""
);
return(entity);
}
return(ExecuteMethod(httpContext, method));
}
private async Task WriteAsync(Request req, Response res, HttpStatusCode status, string message, Exception ex)
{
try
{
if (message == null)
{
message = ex?.Message ?? status.ToString().ChangeCase(TextCase.ProperCase);
}
var validMimeTypes = new[] {
MediaSerializer.JsonSiren,
MediaSerializer.Json,
MediaSerializer.XmlSiren,
MediaSerializer.Xml
};
var accept = new AcceptHeader(req.Headers, req.QueryArgs);
var encoding = accept.BestEncoding;
var mimeType = accept.SelectBestMatch(accept.MimeTypes, validMimeTypes) ?? MediaSerializer.Json;
var renderType = mimeType.Contains("json") ? MediaSerializer.JsonSiren : MediaSerializer.XmlSiren;
var serializer = new MediaSerializer(renderType);
using (var memory = new MemoryStream())
{
var entity = (ex != null)
? HttpEntity.Create(req.RequestUri, status, message, ex)
: HttpEntity.Create(req.RequestUri, status, message);
serializer.Serialize(entity, memory, encoding);
memory.Position = 0;
res.Status = status;
res.Headers[HeaderNames.ContentType] = $"{mimeType}; charset={encoding.WebName}";
await memory.CopyToAsync(res.Body);
}
}
catch (Exception exx)
{
res.Status = status;
res.Headers[HeaderNames.ContentType] = $"text/plain; charset=UTF-8";
var ln = Environment.NewLine;
var description = status.ToString().ChangeCase(TextCase.ProperCase);
var writer = new StreamWriter(res.Body, Encoding.UTF8, bufferSize: 8 * 1024, leaveOpen: true);
await writer.WriteAsync(
$"{(int)status} - {description}{ln}{message}{ln}Fault:{ln}{exx.GetStackTrace()}{ln}Caused by:{ln}{ex.GetStackTrace()}"
);
}
}
public static async Task <Entity> RequestEntityAsync(string href)
{
try
{
await Task.Delay(3000);
throw new NotImplementedException(nameof(RequestEntityAsync));
//return await Task.FromResult(new Entity());
}
catch (Exception ex)
{
return(await Task.FromResult(HttpEntity.Create(href, ex)));
}
}
public static IPage CreatePage(Window window, Entity entity)
{
try
{
var @class = entity.Class?.OrderByDescending(Classes.IndexOf).FirstOrDefault();
var typeName = $"{typeof(IPage).Namespace}.{@class.ChangeCase(TextCase.PascalCase)}Page";
var type = Type.GetType(typeName) ?? typeof(ErrorPage);
var page = (IPage)Activator.CreateInstance(type, window, entity);
return(page);
}
catch (Exception ex)
{
string href = entity.Links?.FirstOrDefault(x => x.Rel.Has(RelNames.Self))?.Href;
entity = HttpEntity.Create(href, ex);
var page = new ErrorPage(window, entity);
return(page);
}
}
public async Task <Ret <Content> > RequestAsync(string uri, string method, Entity data)
{
Ret <Content> ret;
try
{
var http = new HttpClient();
ret = await http.RequestAsync(uri, method, data);
}
catch (Exception ex)
{
var fault = HttpEntity.Create(uri, ex);
ret = Ret.Fail(uri, ex);
ret.Value = new Content
{
Href = uri,
Data = fault.Value
};
}
return(ret);
}
public async Task Invoke(HttpContext httpContext, IServiceProvider serviceProvider)
{
Entity entity = null;
int status;
try
{
var target = RenderTarget(httpContext);
if (target?.Value is Uri uri)
{
// Redirecionando para outra URI
httpContext.Response.StatusCode = (int)HttpStatusCode.Found;
httpContext.Response.Headers[HeaderNames.Location] = uri.ToString();
return;
}
entity = target?.Value as Entity;
if (entity == null)
{
var requestUri = httpContext.Request.GetDisplayUrl();
entity = HttpEntity.Create(requestUri, HttpStatusCode.NotFound);
}
status = (int)HttpStatusCode.OK;
}
catch (Exception ex)
{
ex.Trace();
entity = HttpEntity.Create(httpContext.Request.GetDisplayUrl(), ex);
status = (int)HttpStatusCode.InternalServerError;
}
try
{
var mediaType = httpContext.Request.ContentType?.Contains("xml") == true
? "application/xml"
: "application/json";
var serializer = new MediaSerializer();
var content = serializer.Serialize(entity, mediaType);
httpContext.Response.StatusCode = (int)status;
httpContext.Response.ContentType = $"{mediaType}; charset=UTF-8";
await httpContext.Response.WriteAsync(content);
}
catch (Exception ex)
{
ex.Trace();
status = (int)HttpStatusCode.InternalServerError;
var statusDecription =
HttpStatusCode.InternalServerError
.ToString()
.ChangeCase(TextCase.ProperCase);
httpContext.Response.StatusCode = status;
httpContext.Response.ContentType = $"text/plain; charset=UTF-8";
var nl = Environment.NewLine;
var cause = string.Join(nl, ex.GetCauseMessages().Select(x => $" • {x}"));
var message = $"Fault {nl} {status} - {statusDecription} {nl}Cause {nl}{cause}";
await httpContext.Response.WriteAsync(message);
}
}
private async Task SendProxyAsync(HttpContext httpContext)
{
var req = httpContext.Request;
var query = httpContext.Request.Query;
var path = (string)query["path"];
if (path != null)
{
Proxy proxy = registry.FindExact(path);
if (proxy == null)
{
var ret = HttpEntity.Create(
route: req.GetRequestUri(),
status: HttpStatusCode.NotFound,
message: $"Proxy não registrado: {path}"
);
await SendStatusAsync(httpContext, ret);
}
else
{
var href = req.GetRequestUri();
var allProxiesHref = new Route(href).UnsetArgs("path");
var entity = new Entity();
entity.Title = $"Configuração de proxy: {proxy.Path}";
entity.Class = KnownClasses.Single;
entity.Links = new LinkCollection();
entity.Links.AddSelf(href);
entity.Links.Add("link", "Todas as configurações de proxy", allProxiesHref);
entity.Properties = new PropertyCollection();
entity.Properties.AddFromGraph(proxy);
entity.Properties.AddDataHeadersFromGraph <Proxy>();
await SendStatusAsync(httpContext, Ret.Ok(entity));
}
}
else
{
var entity = new Entity();
entity.Class = KnownClasses.Rows;
entity.Title = "Todas as configurações de proxy";
entity.Links = new LinkCollection();
entity.Links.AddSelf(req.GetRequestUri());
entity.Entities = new EntityCollection();
entity.Properties = new PropertyCollection();
entity.Properties.AddRowsHeadersFromGraph <Proxy>();
foreach (var knownPath in registry.Paths)
{
var proxy = registry.FindExact(knownPath);
var href =
new Route(req.GetRequestUri())
.SetArg("path", proxy.Path)
.ToString();
var row = new Entity();
row.Title = $"Configuração de proxy: {proxy.Path}";
row.Class = KnownClasses.Row;
row.Rel = KnownRelations.Row;
row.Links = new LinkCollection();
row.Links.AddSelf(href);
row.Properties = new PropertyCollection();
row.Properties.AddFromGraph(proxy);
entity.Entities.Add(row);
}
await SendStatusAsync(httpContext, Ret.Ok(entity));
}
}
private async Task EditProxyAsync(HttpContext httpContext)
{
var req = httpContext.Request;
var query = httpContext.Request.Query;
var path = (string)query["path"];
var reverseUri = (string)query["reverseUri"];
if (path == null || reverseUri == null)
{
var ret = HttpEntity.Create(
route: req.GetRequestUri(),
status: HttpStatusCode.BadRequest,
message: "Uso incorreto. Os parâmetros `path' e `reverseUri' devem ser indicados."
);
await SendStatusAsync(httpContext, ret);
return;
}
bool hasDelete = req.Method.EqualsAny("DELETE", "PUT", "PATCH");
bool hasEdit = req.Method.EqualsAny("GET", "POST", "PUT", "PATCH");
Proxy oldProxy = registry.FindExact(path);
Proxy newProxy;
try
{
newProxy = Proxy.Create(path, reverseUri);
}
catch (Exception ex)
{
ex.TraceWarning();
var ret = HttpEntity.Create(
route: req.GetRequestUri(),
status: HttpStatusCode.BadRequest,
message: "Os parâmetros `path' e `reverseUri` não estão corretos."
);
await SendStatusAsync(httpContext, ret);
return;
}
if (oldProxy != null && !oldProxy.ReverseUri.Equals(newProxy.ReverseUri))
{
var ret = HttpEntity.Create(
route: req.GetRequestUri(),
status: HttpStatusCode.BadRequest,
message: $"Já existe um proxy diferente configurado nesta rota `{oldProxy.Path}'."
);
await SendStatusAsync(httpContext, ret);
return;
}
if (hasDelete)
{
if (oldProxy != null)
{
registry.Remove(path);
}
}
if (hasEdit)
{
if (oldProxy != null)
{
oldProxy.Enabled = true;
oldProxy.LastSeen = DateTime.Now;
}
else
{
registry.Add(newProxy);
}
}
var status = HttpEntity.Create(
route: req.GetRequestUri(),
status: HttpStatusCode.OK,
message: hasEdit ? "Registro de proxy efetuado." : "Registro de proxy removido."
);
status.Data.Properties.Add("Path", newProxy.Path.ToString());
status.Data.Properties.Add("ReverseUri", newProxy.ReverseUri.ToString());
await SendStatusAsync(httpContext, status);
}
public static Entity GetStatus(UriString requestUri, string prefix)
{
return(HttpEntity.Create(requestUri, HttpStatusCode.OK));
}
private async Task <Ret <Content> > SendAsync(
string uri
, string method
, object upData
, string upType
, string upCharset
, string downType
, string downCharset
, int maxRedirect = 5
)
{
try
{
#if DEBUG
if (upData is Entity upEntity)
{
Debug.WriteLine("---REQUEST---");
Debug.WriteLine(upEntity.ToJson());
Debug.WriteLine("---END---");
}
#endif
var ret = await http.RequestAsync(uri, method, upData, upType, upCharset, downType, downCharset);
var isRedirect = (ret.Status.CodeClass == HttpStatusClass.Redirection) && (maxRedirect > 0);
if (isRedirect)
{
var redirectUri = ret.Status.Headers[HeaderNames.Location] ?? uri;
switch (ret.Status.Code)
{
case HttpStatusCode.Redirect:
{
return(await SendAsync(
redirectUri
, MethodNames.Get
, upData : null
, upType : null
, upCharset : null
, downType : downType
, downCharset : downCharset
, maxRedirect : maxRedirect - 1
));
}
case HttpStatusCode.RedirectKeepVerb:
{
return(await SendAsync(
redirectUri
, method
, upData
, upType
, upCharset
, downType
, downCharset
, maxRedirect - 1
));
}
}
}
#if DEBUG
if (ret.Value?.Data is Entity downEntity)
{
Debug.WriteLine("---RESPONSE---");
Debug.WriteLine(downEntity.ToJson());
Debug.WriteLine("---END---");
}
#endif
if (ret.Value?.Data == null)
{
var faultEntity = HttpEntity.CreateFromRet(uri, ret);
ret.Value = new Content
{
Href = uri,
Data = faultEntity.Value
};
}
return(ret);
}
catch (Exception ex)
{
var faultEntity = HttpEntity.Create(uri, ex);
return(new Ret <Content>
{
Status = faultEntity.Status,
Fault = faultEntity.Fault,
Value = new Content
{
Href = uri,
Data = faultEntity.Value
}
});
}
}
