// ConnectResource returns a function that handles a connect request on a rest.Storage object.
func ConnectResource(connecter rest.Connecter, scope RequestScope, admit admission.Interface, restPath string) restful.RouteFunction {
	return func(req *restful.Request, res *restful.Response) {
		w := res.ResponseWriter
		namespace, name, err := scope.Namer.Name(req)
		if err != nil {
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}
		ctx := scope.ContextFunc(req)
		ctx = api.WithNamespace(ctx, namespace)
		opts, subpath, subpathKey := connecter.NewConnectOptions()
		if err := getRequestOptions(req, scope, opts, subpath, subpathKey); err != nil {
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}
		if admit.Handles(admission.Connect) {
			connectRequest := &rest.ConnectRequest{
				Name:         name,
				Options:      opts,
				ResourcePath: restPath,
			}
			userInfo, _ := api.UserFrom(ctx)

			err = admit.Admit(admission.NewAttributesRecord(connectRequest, nil, scope.Kind, namespace, name, scope.Resource, scope.Subresource, admission.Connect, userInfo))
			if err != nil {
				scope.err(err, res.ResponseWriter, req.Request)
				return
			}
		}
		handler, err := connecter.Connect(ctx, name, opts, &responder{scope: scope, req: req, res: res})
		if err != nil {
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}
		handler.ServeHTTP(w, req.Request)
	}
}
// DeleteCollection returns a function that will handle a collection deletion
func DeleteCollection(r rest.CollectionDeleter, checkBody bool, scope RequestScope, admit admission.Interface) restful.RouteFunction {
	return func(req *restful.Request, res *restful.Response) {
		w := res.ResponseWriter

		// TODO: we either want to remove timeout or document it (if we document, move timeout out of this function and declare it in api_installer)
		timeout := parseTimeout(req.Request.URL.Query().Get("timeout"))

		namespace, err := scope.Namer.Namespace(req)
		if err != nil {
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}

		ctx := scope.ContextFunc(req)
		ctx = api.WithNamespace(ctx, namespace)

		if admit != nil && admit.Handles(admission.Delete) {
			userInfo, _ := api.UserFrom(ctx)

			err = admit.Admit(admission.NewAttributesRecord(nil, nil, scope.Kind, namespace, "", scope.Resource, scope.Subresource, admission.Delete, userInfo))
			if err != nil {
				scope.err(err, res.ResponseWriter, req.Request)
				return
			}
		}

		listOptions := api.ListOptions{}
		if err := scope.ParameterCodec.DecodeParameters(req.Request.URL.Query(), scope.Kind.GroupVersion(), &listOptions); err != nil {
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}

		// transform fields
		// TODO: DecodeParametersInto should do this.
		if listOptions.FieldSelector != nil {
			fn := func(label, value string) (newLabel, newValue string, err error) {
				return scope.Convertor.ConvertFieldLabel(scope.Kind.GroupVersion().String(), scope.Kind.Kind, label, value)
			}
			if listOptions.FieldSelector, err = listOptions.FieldSelector.Transform(fn); err != nil {
				// TODO: allow bad request to set field causes based on query parameters
				err = errors.NewBadRequest(err.Error())
				scope.err(err, res.ResponseWriter, req.Request)
				return
			}
		}

		options := &api.DeleteOptions{}
		if checkBody {
			body, err := readBody(req.Request)
			if err != nil {
				scope.err(err, res.ResponseWriter, req.Request)
				return
			}
			if len(body) > 0 {
				s, err := negotiateInputSerializer(req.Request, scope.Serializer)
				if err != nil {
					scope.err(err, res.ResponseWriter, req.Request)
					return
				}
				defaultGVK := scope.Kind.GroupVersion().WithKind("DeleteOptions")
				obj, _, err := scope.Serializer.DecoderToVersion(s, defaultGVK.GroupVersion()).Decode(body, &defaultGVK, options)
				if err != nil {
					scope.err(err, res.ResponseWriter, req.Request)
					return
				}
				if obj != options {
					scope.err(fmt.Errorf("decoded object cannot be converted to DeleteOptions"), res.ResponseWriter, req.Request)
					return
				}
			}
		}

		result, err := finishRequest(timeout, func() (runtime.Object, error) {
			return r.DeleteCollection(ctx, options, &listOptions)
		})
		if err != nil {
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}

		// if the rest.Deleter returns a nil object, fill out a status. Callers may return a valid
		// object with the response.
		if result == nil {
			result = &unversioned.Status{
				Status: unversioned.StatusSuccess,
				Code:   http.StatusOK,
				Details: &unversioned.StatusDetails{
					Kind: scope.Kind.Kind,
				},
			}
		} else {
			// when a non-status response is returned, set the self link
			if _, ok := result.(*unversioned.Status); !ok {
				if _, err := setListSelfLink(result, req, scope.Namer); err != nil {
					scope.err(err, res.ResponseWriter, req.Request)
					return
				}
			}
		}
		writeNegotiated(scope.Serializer, scope.Kind.GroupVersion(), w, req.Request, http.StatusOK, result)
	}
}
// DeleteResource returns a function that will handle a resource deletion
func DeleteResource(r rest.GracefulDeleter, checkBody bool, scope RequestScope, admit admission.Interface) restful.RouteFunction {
	return func(req *restful.Request, res *restful.Response) {
		// For performance tracking purposes.
		trace := util.NewTrace("Delete " + req.Request.URL.Path)
		defer trace.LogIfLong(250 * time.Millisecond)

		w := res.ResponseWriter

		// TODO: we either want to remove timeout or document it (if we document, move timeout out of this function and declare it in api_installer)
		timeout := parseTimeout(req.Request.URL.Query().Get("timeout"))

		namespace, name, err := scope.Namer.Name(req)
		if err != nil {
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}
		ctx := scope.ContextFunc(req)
		ctx = api.WithNamespace(ctx, namespace)

		options := &api.DeleteOptions{}
		if checkBody {
			body, err := readBody(req.Request)
			if err != nil {
				scope.err(err, res.ResponseWriter, req.Request)
				return
			}
			if len(body) > 0 {
				s, err := negotiateInputSerializer(req.Request, scope.Serializer)
				if err != nil {
					scope.err(err, res.ResponseWriter, req.Request)
					return
				}
				defaultGVK := scope.Kind.GroupVersion().WithKind("DeleteOptions")
				obj, _, err := scope.Serializer.DecoderToVersion(s, defaultGVK.GroupVersion()).Decode(body, &defaultGVK, options)
				if err != nil {
					scope.err(err, res.ResponseWriter, req.Request)
					return
				}
				if obj != options {
					scope.err(fmt.Errorf("decoded object cannot be converted to DeleteOptions"), res.ResponseWriter, req.Request)
					return
				}
			}
		}

		if admit != nil && admit.Handles(admission.Delete) {
			userInfo, _ := api.UserFrom(ctx)

			err = admit.Admit(admission.NewAttributesRecord(nil, nil, scope.Kind, namespace, name, scope.Resource, scope.Subresource, admission.Delete, userInfo))
			if err != nil {
				scope.err(err, res.ResponseWriter, req.Request)
				return
			}
		}

		trace.Step("About do delete object from database")
		result, err := finishRequest(timeout, func() (runtime.Object, error) {
			return r.Delete(ctx, name, options)
		})
		if err != nil {
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}
		trace.Step("Object deleted from database")

		// if the rest.Deleter returns a nil object, fill out a status. Callers may return a valid
		// object with the response.
		if result == nil {
			result = &unversioned.Status{
				Status: unversioned.StatusSuccess,
				Code:   http.StatusOK,
				Details: &unversioned.StatusDetails{
					Name: name,
					Kind: scope.Kind.Kind,
				},
			}
		} else {
			// when a non-status response is returned, set the self link
			if _, ok := result.(*unversioned.Status); !ok {
				if err := setSelfLink(result, req, scope.Namer); err != nil {
					scope.err(err, res.ResponseWriter, req.Request)
					return
				}
			}
		}
		write(http.StatusOK, scope.Kind.GroupVersion(), scope.Serializer, result, w, req.Request)
	}
}
// UpdateResource returns a function that will handle a resource update
func UpdateResource(r rest.Updater, scope RequestScope, typer runtime.ObjectTyper, admit admission.Interface) restful.RouteFunction {
	return func(req *restful.Request, res *restful.Response) {
		// For performance tracking purposes.
		trace := util.NewTrace("Update " + req.Request.URL.Path)
		defer trace.LogIfLong(250 * time.Millisecond)

		w := res.ResponseWriter

		// TODO: we either want to remove timeout or document it (if we document, move timeout out of this function and declare it in api_installer)
		timeout := parseTimeout(req.Request.URL.Query().Get("timeout"))

		namespace, name, err := scope.Namer.Name(req)
		if err != nil {
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}
		ctx := scope.ContextFunc(req)
		ctx = api.WithNamespace(ctx, namespace)

		body, err := readBody(req.Request)
		if err != nil {
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}

		s, err := negotiateInputSerializer(req.Request, scope.Serializer)
		if err != nil {
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}
		defaultGVK := scope.Kind
		original := r.New()
		trace.Step("About to convert to expected version")
		obj, gvk, err := scope.Serializer.DecoderToVersion(s, defaultGVK.GroupVersion()).Decode(body, &defaultGVK, original)
		if err != nil {
			err = transformDecodeError(typer, err, original, gvk, body)
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}
		if gvk.GroupVersion() != defaultGVK.GroupVersion() {
			err = errors.NewBadRequest(fmt.Sprintf("the API version in the data (%s) does not match the expected API version (%s)", gvk.GroupVersion(), defaultGVK.GroupVersion()))
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}
		trace.Step("Conversion done")

		if err := checkName(obj, name, namespace, scope.Namer); err != nil {
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}

		var transformers []rest.TransformFunc
		if admit != nil && admit.Handles(admission.Update) {
			transformers = append(transformers, func(ctx api.Context, newObj, oldObj runtime.Object) (runtime.Object, error) {
				userInfo, _ := api.UserFrom(ctx)
				return newObj, admit.Admit(admission.NewAttributesRecord(newObj, oldObj, scope.Kind, namespace, name, scope.Resource, scope.Subresource, admission.Update, userInfo))
			})
		}

		trace.Step("About to store object in database")
		wasCreated := false
		result, err := finishRequest(timeout, func() (runtime.Object, error) {
			obj, created, err := r.Update(ctx, name, rest.DefaultUpdatedObjectInfo(obj, scope.Copier, transformers...))
			wasCreated = created
			return obj, err
		})
		if err != nil {
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}
		trace.Step("Object stored in database")

		if err := setSelfLink(result, req, scope.Namer); err != nil {
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}
		trace.Step("Self-link added")

		status := http.StatusOK
		if wasCreated {
			status = http.StatusCreated
		}
		write(status, scope.Kind.GroupVersion(), scope.Serializer, result, w, req.Request)
	}
}
// PatchResource returns a function that will handle a resource patch
// TODO: Eventually PatchResource should just use GuaranteedUpdate and this routine should be a bit cleaner
func PatchResource(r rest.Patcher, scope RequestScope, typer runtime.ObjectTyper, admit admission.Interface, converter runtime.ObjectConvertor) restful.RouteFunction {
	return func(req *restful.Request, res *restful.Response) {
		w := res.ResponseWriter

		// TODO: we either want to remove timeout or document it (if we
		// document, move timeout out of this function and declare it in
		// api_installer)
		timeout := parseTimeout(req.Request.URL.Query().Get("timeout"))

		namespace, name, err := scope.Namer.Name(req)
		if err != nil {
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}

		ctx := scope.ContextFunc(req)
		ctx = api.WithNamespace(ctx, namespace)

		versionedObj, err := converter.ConvertToVersion(r.New(), scope.Kind.GroupVersion())
		if err != nil {
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}

		// TODO: handle this in negotiation
		contentType := req.HeaderParameter("Content-Type")
		// Remove "; charset=" if included in header.
		if idx := strings.Index(contentType, ";"); idx > 0 {
			contentType = contentType[:idx]
		}
		patchType := api.PatchType(contentType)

		patchJS, err := readBody(req.Request)
		if err != nil {
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}

		s, ok := scope.Serializer.SerializerForMediaType("application/json", nil)
		if !ok {
			scope.err(fmt.Errorf("no serializer defined for JSON"), res.ResponseWriter, req.Request)
			return
		}
		gv := scope.Kind.GroupVersion()
		codec := runtime.NewCodec(
			scope.Serializer.EncoderForVersion(s, gv),
			scope.Serializer.DecoderToVersion(s, unversioned.GroupVersion{Group: gv.Group, Version: runtime.APIVersionInternal}),
		)

		updateAdmit := func(updatedObject runtime.Object, currentObject runtime.Object) error {
			if admit != nil && admit.Handles(admission.Update) {
				userInfo, _ := api.UserFrom(ctx)
				return admit.Admit(admission.NewAttributesRecord(updatedObject, currentObject, scope.Kind, namespace, name, scope.Resource, scope.Subresource, admission.Update, userInfo))
			}

			return nil
		}

		result, err := patchResource(ctx, updateAdmit, timeout, versionedObj, r, name, patchType, patchJS, scope.Namer, scope.Copier, scope.Resource, codec)
		if err != nil {
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}

		if err := setSelfLink(result, req, scope.Namer); err != nil {
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}

		write(http.StatusOK, scope.Kind.GroupVersion(), scope.Serializer, result, w, req.Request)
	}

}
func createHandler(r rest.NamedCreater, scope RequestScope, typer runtime.ObjectTyper, admit admission.Interface, includeName bool) restful.RouteFunction {
	return func(req *restful.Request, res *restful.Response) {
		// For performance tracking purposes.
		trace := util.NewTrace("Create " + req.Request.URL.Path)
		defer trace.LogIfLong(250 * time.Millisecond)

		w := res.ResponseWriter

		// TODO: we either want to remove timeout or document it (if we document, move timeout out of this function and declare it in api_installer)
		timeout := parseTimeout(req.Request.URL.Query().Get("timeout"))

		var (
			namespace, name string
			err             error
		)
		if includeName {
			namespace, name, err = scope.Namer.Name(req)
		} else {
			namespace, err = scope.Namer.Namespace(req)
		}
		if err != nil {
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}

		ctx := scope.ContextFunc(req)
		ctx = api.WithNamespace(ctx, namespace)

		gv := scope.Kind.GroupVersion()
		s, err := negotiateInputSerializer(req.Request, scope.Serializer)
		if err != nil {
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}
		decoder := scope.Serializer.DecoderToVersion(s, unversioned.GroupVersion{Group: gv.Group, Version: runtime.APIVersionInternal})

		body, err := readBody(req.Request)
		if err != nil {
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}

		defaultGVK := scope.Kind
		original := r.New()
		trace.Step("About to convert to expected version")
		obj, gvk, err := decoder.Decode(body, &defaultGVK, original)
		if err != nil {
			err = transformDecodeError(typer, err, original, gvk, body)
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}
		if gvk.GroupVersion() != gv {
			err = errors.NewBadRequest(fmt.Sprintf("the API version in the data (%s) does not match the expected API version (%v)", gvk.GroupVersion().String(), gv.String()))
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}
		trace.Step("Conversion done")

		if admit != nil && admit.Handles(admission.Create) {
			userInfo, _ := api.UserFrom(ctx)

			err = admit.Admit(admission.NewAttributesRecord(obj, nil, scope.Kind, namespace, name, scope.Resource, scope.Subresource, admission.Create, userInfo))
			if err != nil {
				scope.err(err, res.ResponseWriter, req.Request)
				return
			}
		}

		trace.Step("About to store object in database")
		result, err := finishRequest(timeout, func() (runtime.Object, error) {
			out, err := r.Create(ctx, name, obj)
			if status, ok := out.(*unversioned.Status); ok && err == nil && status.Code == 0 {
				status.Code = http.StatusCreated
			}
			return out, err
		})
		if err != nil {
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}
		trace.Step("Object stored in database")

		if err := setSelfLink(result, req, scope.Namer); err != nil {
			scope.err(err, res.ResponseWriter, req.Request)
			return
		}
		trace.Step("Self-link added")

		write(http.StatusCreated, scope.Kind.GroupVersion(), scope.Serializer, result, w, req.Request)
	}
}