signins

server/handlers/signup.go

@@ -0,0 +1,100 @@
+package handlers
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"strings"
+	"strconv"
+)
+
+// Struct for incoming JSON request
+type SignupRequest struct {
+	Email string `json:"email"`
+}
+
+// Struct for JSON response
+type SignupResponse struct {
+	Message string `json:"message"`
+}
+
+type User struct {
+	Email string `json:"email"`
+}
+
+func HandleSignup(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		http.Error(w, "Only POST allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	if err := r.ParseForm(); err != nil {
+		http.Error(w, "Failed to parse form", http.StatusBadRequest)
+		return
+	}
+
+	email := strings.TrimSpace(r.FormValue("email"))
+	if email == "" {
+		http.Error(w, "Missing email", http.StatusBadRequest)
+		return
+	}
+
+	// Optional: basic email format check
+	if !strings.Contains(email, "@") {
+		http.Error(w, "Invalid email format", http.StatusBadRequest)
+		return
+	}
+
+	log.Printf("Received signup from email: %s", email)
+	err := AddUserToFile(email, "db/users.json")
+	if err != nil {
+		log.Printf("Error saving user: %v", err)
+		http.Error(w, "Failed to save user", http.StatusInternalServerError)
+		return
+	}
+
+	// Respond with success
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(SignupResponse{
+		Message: fmt.Sprintf("Signup received for %s", email),
+	})
+}
+
+func AddUserToFile(email string, filepath string) error {
+	// Read the current users (if file exists)
+	users := make(map[string]User)
+
+	if existingData, err := os.ReadFile(filepath); err == nil && len(existingData) > 0 {
+		if err := json.Unmarshal(existingData, &users); err != nil {
+			return fmt.Errorf("invalid users.json format: %v", err)
+		}
+	}
+
+	// Find the next numeric key
+	maxID := 0
+	for key := range users {
+		id, err := strconv.Atoi(key)
+		if err == nil && id > maxID {
+			maxID = id
+		}
+	}
+	newID := strconv.Itoa(maxID + 1)
+
+	// Add new user
+	users[newID] = User{Email: email}
+
+	// Marshal updated data
+	updated, err := json.MarshalIndent(users, "", "  ")
+	if err != nil {
+		return fmt.Errorf("could not marshal updated users: %v", err)
+	}
+
+	// Write updated data back to file
+	if err := os.WriteFile(filepath, updated, 0644); err != nil {
+		return fmt.Errorf("could not write to users file: %v", err)
+	}
+
+	return nil
+}