[master] Add Webhook Server and Routes/Routesspecs models

Signed-off-by: 4thel00z <[email protected]>

pkg/webhooks/models.go

@@ -0,0 +1,100 @@
+package webhooks
+
+import (
+	"fmt"
+	"github.com/kataras/iris/v12"
+	"github.com/kataras/iris/v12/core/host"
+	"io/ioutil"
+	"net/http"
+	"plugin"
+)
+
+type HTTPHandler func(http.ResponseWriter, *http.Request)
+
+func (h HTTPHandler) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
+	h(writer, request)
+}
+
+type Route struct {
+	Path    string
+	Method  string
+	Handler http.Handler
+}
+
+type RouteSpec struct {
+	Path        string `yaml:"path"`
+	Method      string `yaml:"method"`
+	HandlerName string `yaml:"handler-name"`
+}
+
+type Server struct {
+	Routes             []Route
+	TLSCertificatePath string
+	TLSKeyPath         string
+	Port               int
+	Host               string
+}
+
+func NewServer(pluginPath, certPath, keyPath, host string, port int, specs ...RouteSpec) (Server, error) {
+	p, err := plugin.Open(pluginPath)
+
+	if err != nil {
+		return Server{}, err
+	}
+	routes := []Route{}
+	for _, spec := range specs {
+		sym, err := p.Lookup(spec.HandlerName)
+		if err != nil {
+			return Server{}, err
+		}
+		handler, ok := sym.(HTTPHandler)
+
+		if !ok {
+			return Server{}, fmt.Errorf("%s is not of type http.Handler", spec.HandlerName)
+		}
+		routes = append(routes, Route{
+			Path:    spec.Path,
+			Method:  spec.Method,
+			Handler: handler,
+		})
+	}
+	return Server{
+		Routes:             routes,
+		TLSCertificatePath: certPath,
+		TLSKeyPath:         keyPath,
+	}, nil
+}
+
+func (s *Server) Serve(cs ...host.Configurator) error {
+	app := iris.New()
+	addr := fmt.Sprintf("%s:%d", s.Host, s.Port)
+
+	for _, route := range s.Routes {
+		app.Handle(route.Method, route.Path, func(ctx iris.Context) {
+			w, r := ctx.ResponseWriter(), ctx.Request()
+			route.Handler.ServeHTTP(w, r)
+		})
+	}
+
+	if s.TLSCertificatePath != "" && s.TLSKeyPath != "" {
+		tlsCert, err := ioutil.ReadFile(s.TLSCertificatePath)
+		if err != nil {
+			return err
+		}
+
+		tlsKey, err := ioutil.ReadFile(s.TLSKeyPath)
+		if err != nil {
+			return err
+		}
+
+		return iris.TLS(addr, string(tlsCert), string(tlsKey), cs...)(app)
+	}
+
+	return app.NewHost(&http.Server{Addr: addr}).Configure(cs...).ListenAndServe()
+}
+
+func (s *Server) ServeAsync(out chan<- error, cs ...host.Configurator) {
+	go func() {
+		out <- s.Serve(cs...)
+	}()
+}