Implement login endpoint

login/main.go

@@ -4,7 +4,7 @@ import (
 	gc "github.com/rthornton128/goncurses"
 )
 
-const URLLogin = "http://127.0.0.1:8081/login"
+const URLLogin = "http://172.23.0.1:8081/login"
 
 func goLogin(stdscr *gc.Window, in chan gc.Key) (string, bool) {
 	username, password := login(stdscr, in)
@@ -38,6 +38,7 @@ func main() {
 	gc.InitPair(2, gc.C_GREEN, gc.C_BLACK)
 	gc.InitPair(3, gc.C_CYAN, gc.C_BLACK)
 	gc.InitPair(4, gc.C_RED, gc.C_BLACK)
+	gc.InitPair(5, gc.C_BLACK, gc.C_WHITE)
 
 	// Register pressed key through channel
 	in := make(chan gc.Key)

login/windows.go

@@ -14,12 +14,12 @@ func login(stdscr *gc.Window, in chan gc.Key) (username , password string) {
 	fields := make([]*gc.Field, 3)
 	fields[0], _ = gc.NewField(1, 15, 2, 18, 0, 0)
 	defer fields[0].Free()
-	fields[0].SetBackground(gc.A_UNDERLINE)
+	fields[0].SetBackground(gc.ColorPair(5) | gc.A_UNDERLINE)
 	fields[0].SetOptionsOff(gc.FO_AUTOSKIP)
 
 	fields[1], _ = gc.NewField(1, 15, 4, 18, 0, 0)
 	defer fields[1].Free()
-	fields[1].SetBackground(gc.A_UNDERLINE)
+	fields[1].SetBackground(gc.ColorPair(5) | gc.A_UNDERLINE)
 	fields[1].SetOptionsOff(gc.FO_PUBLIC)
 	fields[1].SetOptionsOff(gc.FO_AUTOSKIP)
 

validator/index.go

@@ -71,8 +71,8 @@ func Index(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", "text/html")
 
 	if indexTmpl, err := template.New("index").Parse(indextpl); err != nil {
-		http.Error(w, "Cannot create template: " + err.Error(), http.StatusInternalServerError)
+		http.Error(w, "Cannot create template: "+err.Error(), http.StatusInternalServerError)
 	} else if err := indexTmpl.Execute(w, nil); err != nil {
-		http.Error(w, "An error occurs during template execution: " + err.Error(), http.StatusInternalServerError)
+		http.Error(w, "An error occurs during template execution: "+err.Error(), http.StatusInternalServerError)
 	}
 }

validator/login.go

@@ -0,0 +1,62 @@
+package main
+
+import (
+	"encoding/json"
+	"log"
+	"net/http"
+)
+
+type loginChecker struct{
+	students []Student
+}
+
+type loginUpload struct {
+	Username string
+	Password string
+}
+
+func (l loginChecker) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if addr := r.Header.Get("X-Forwarded-For"); addr != "" {
+		r.RemoteAddr = addr
+	}
+	log.Printf("%s \"%s %s\" [%s]\n", r.RemoteAddr, r.Method, r.URL.Path, r.UserAgent())
+
+	w.Header().Set("Content-Type", "text/plain")
+
+	// Check request type and size
+	if r.Method != "POST" {
+		http.Error(w,
+			"Invalid request",
+			http.StatusBadRequest)
+		return
+	} else if r.ContentLength < 0 || r.ContentLength > 1023 {
+		http.Error(w,
+			"Request entity too large",
+			http.StatusRequestEntityTooLarge)
+		return
+	}
+
+	dec := json.NewDecoder(r.Body)
+	var lu loginUpload
+	if err := dec.Decode(&lu); err != nil {
+		http.Error(w,
+			err.Error(),
+			http.StatusBadRequest)
+		return
+	}
+
+	// Perform login check
+	canContinue := false
+	for _, std := range l.students {
+		if std.Login == lu.Username {
+			canContinue = true
+		}
+	}
+
+	if !canContinue {
+		http.Error(w, "Login not found in whitelist.", http.StatusUnauthorized)
+		return
+	}
+
+	http.Error(w, "Success", http.StatusOK)
+}