netmaker/controllers/server.go

package controller

import (
	"encoding/json"
	"net/http"
	"strings"

	"github.com/gorilla/mux"
	"github.com/gravitl/netmaker/logic"
	"github.com/gravitl/netmaker/models"
	"github.com/gravitl/netmaker/servercfg"
	"github.com/gravitl/netmaker/serverctl"
)

func serverHandlers(r *mux.Router) {
	r.HandleFunc("/api/server/addnetwork/{network}", securityCheckServer(true, http.HandlerFunc(addNetwork))).Methods("POST")
	r.HandleFunc("/api/server/getconfig", securityCheckServer(false, http.HandlerFunc(getConfig))).Methods("GET")
	r.HandleFunc("/api/server/removenetwork/{network}", securityCheckServer(true, http.HandlerFunc(removeNetwork))).Methods("DELETE")
}

//Security check is middleware for every function and just checks to make sure that its the master calling
//Only admin should have access to all these network-level actions
//or maybe some Users once implemented
func securityCheckServer(adminonly bool, next http.Handler) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		var errorResponse = models.ErrorResponse{
			Code: http.StatusInternalServerError, Message: "W1R3: It's not you it's me.",
		}

		bearerToken := r.Header.Get("Authorization")

		var tokenSplit = strings.Split(bearerToken, " ")
		var authToken = ""
		if len(tokenSplit) < 2 {
			errorResponse = models.ErrorResponse{
				Code: http.StatusUnauthorized, Message: "W1R3: You are unauthorized to access this endpoint.",
			}
			returnErrorResponse(w, r, errorResponse)
			return
		} else {
			authToken = tokenSplit[1]
		}
		//all endpoints here require master so not as complicated
		//still might not be a good  way of doing this
		user, _, isadmin, err := logic.VerifyUserToken(authToken)
		errorResponse = models.ErrorResponse{
			Code: http.StatusUnauthorized, Message: "W1R3: You are unauthorized to access this endpoint.",
		}
		if !adminonly && (err != nil || user == "") {
			returnErrorResponse(w, r, errorResponse)
			return
		}
		if adminonly && !isadmin && !authenticateMasterServer(authToken) {
			returnErrorResponse(w, r, errorResponse)
			return
		}
		next.ServeHTTP(w, r)
	}
}

//Consider a more secure way of setting master key
func authenticateMasterServer(tokenString string) bool {
	return tokenString == servercfg.GetMasterKey()
}

func removeNetwork(w http.ResponseWriter, r *http.Request) {
	// Set header
	w.Header().Set("Content-Type", "application/json")

	// get params
	var params = mux.Vars(r)

	success, err := serverctl.RemoveNetwork(params["network"])

	if err != nil || !success {
		json.NewEncoder(w).Encode("Could not remove server from network " + params["network"])
		return
	}

	json.NewEncoder(w).Encode("Server removed from network " + params["network"])
}

func getConfig(w http.ResponseWriter, r *http.Request) {
	// Set header
	w.Header().Set("Content-Type", "application/json")

	// get params

	scfg := servercfg.GetServerConfig()
	json.NewEncoder(w).Encode(scfg)
	//w.WriteHeader(http.StatusOK)
}

func addNetwork(w http.ResponseWriter, r *http.Request) {
	// Set header
	w.Header().Set("Content-Type", "application/json")

	// get params
	var params = mux.Vars(r)

	success, err := serverctl.AddNetwork(params["network"])

	if err != nil || !success {
		json.NewEncoder(w).Encode("Could not add server to network " + params["network"])
		return
	}

	json.NewEncoder(w).Encode("Server added to network " + params["network"])
}