implemented labor 08

web/08/eigene_loesungen/Aufgabe_01/Aufgabe_01.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"net/http"
+)
+
+type loginHandler int
+type logoutHandler string
+
+func (a loginHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	w.Write([]byte("Login"))
+}
+
+func (b logoutHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	w.Write([]byte("Logout"))
+}
+
+func main() {
+	var a loginHandler
+	var b logoutHandler
+	mux := http.NewServeMux()
+	mux.Handle("/login", a)
+	mux.Handle("/logout", b)
+	http.ListenAndServe("localhost:8080", mux)
+}

web/08/eigene_loesungen/Aufgabe_02/Aufgabe_02.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"net/http"
+
+	"github.com/google/uuid"
+)
+
+type createHandler int
+type showHandler int
+type deleteHandler int
+
+func (a createHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	uuid := uuid.New().String()
+	cookie := &http.Cookie{Name: "keks", Value: uuid}
+	http.SetCookie(w, cookie)
+	w.Write([]byte("Cookie erstellt!"))
+}
+
+func (b showHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	cookie, err := r.Cookie("keks")
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+	w.Write([]byte("Keks Wert: " + cookie.Value))
+}
+
+func (b deleteHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	cookie, err := r.Cookie("keks")
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+	cookie.MaxAge = -1
+	http.SetCookie(w, cookie)
+	w.Write([]byte("Keks gelöscht"))
+}
+
+func main() {
+	var a createHandler
+	var b showHandler
+	var c deleteHandler
+	mux := http.NewServeMux()
+	mux.Handle("/create-cookie", a)
+	mux.Handle("/show-cookie", b)
+	mux.Handle("/delete-cookie", c)
+	http.ListenAndServe("localhost:8080", mux)
+}

web/08/eigene_loesungen/Aufgabe_03/Aufgabe_03.go

@@ -0,0 +1,71 @@
+package main
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/google/uuid"
+)
+
+type signupHandler int
+type whoAmIHandler int
+
+type User struct {
+	Username string `json:"username"`
+	Nickname string `json:"nickname"`
+	Admin    bool   `json:"admin"`
+}
+
+var Users map[string]User
+
+func (a signupHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Access-Control-Allow-Origin", "*")
+	w.Header().Set("Access-Control-Allow-Methods", "POST")
+	w.Header().Set("Access-Control-Allow-Headers", "Content-Type")
+	var user User
+	if err := json.NewDecoder(r.Body).Decode(&user); err != nil {
+		http.Error(w, "Daten konnten nicht verarbeitet werden.", http.StatusBadRequest)
+		return
+	}
+	uuid := uuid.New().String()
+	Users[uuid] = user
+	w.WriteHeader(http.StatusOK)
+	w.Write([]byte("Registrierung erfolgreich"))
+	cookie := &http.Cookie{Name: "uuid", Value: uuid}
+	http.SetCookie(w, cookie)
+}
+
+func (b whoAmIHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	cookie, err := r.Cookie("uuid")
+	if err != nil {
+		w.Write([]byte("Keinen Login Cookie gefunden."))
+		return
+	}
+	if user, ok := Users[cookie.Value]; ok {
+		nickname := user.Nickname
+		admin := user.Admin
+
+		var status string
+		if admin {
+			status = "Admin"
+		} else {
+			status = "normaler Benutzer"
+		}
+
+		w.Write([]byte("Hallo " + nickname + "!\nDu bist als " + status + " registriert."))
+
+	} else {
+		w.Write([]byte("User nicht gefunden!"))
+	}
+
+}
+
+func main() {
+	Users = make(map[string]User)
+	var a signupHandler
+	var b whoAmIHandler
+	mux := http.NewServeMux()
+	mux.Handle("/signup", a)
+	mux.Handle("/whoami", b)
+	http.ListenAndServe("localhost:8080", mux)
+}