feat: add Go microservice, Dockerfile, docker-compose, and API submission endpoint

2026-08-12 17:20:03 +02:00
parent ad02939b88
commit 0ee82eb673
24 changed files with 316 additions and 6 deletions
@@ -0,0 +1,6 @@
+.git
+.github
+Dockerfile
+docker-compose.yml
+.env
+*.exe
@@ -0,0 +1,13 @@
+# Server Port & Configuration
+PORT=8080
+WEB_DIR=public
+
+# SMTP Configuration
+SMTP_HOST=mail.example.com
+SMTP_PORT=587
+SMTP_USER=user@example.com
+SMTP_PASS=secretpassword
+
+# Email Addresses
+TO_EMAIL=destination@example.com
+FROM_EMAIL=sender@example.com
@@ -0,0 +1,20 @@
+I want to add backend functionality to send the survey responses as an email upon submission using Option 1 (a minimalist Go/Golang microservice).
+
+Please complete the following tasks:
+
+1. Go Microservice (`main.go`):
+   - Create a lightweight HTTP server using standard Go library packages (`net/http`, `net/smtp`, `encoding/json`).
+   - Create an endpoint (e.g., `POST /api/submit`) to accept JSON payload survey data from the front end.
+   - Configure SMTP credentials and server settings via environment variables (e.g., `SMTP_HOST`, `SMTP_PORT`, `SMTP_USER`, `SMTP_PASS`, `TO_EMAIL`) via an .env file
+   - Format the incoming JSON survey data into a clean, readable text body and dispatch the email upon request.
+   - Handle CORS preflight (`OPTIONS`) and headers so the HTML/JS front end can POST to it smoothly.
+
+2. Dockerization (`Dockerfile`):
+   - Provide a multi-stage `Dockerfile` (e.g., compile with `golang:alpine`, copy to `scratch` or `alpine`) to ensure the resulting container image is ultra-lightweight (<20MB).
+
+3. Front-End Integration:
+   - Show how to update the existing JavaScript submission handler (using `fetch()`) to send the survey data as JSON to the new Go backend endpoint.
+
+Please keep the code minimalist, robust, and well-commented.
+
+when everything works, please create a simple docker-compose file that builds the project and runs the container. include traefik labels for reverse proxy routing.
@@ -0,0 +1,24 @@
+# Stage 1: Build the Go binary
+FROM golang:1.22-alpine AS builder
+
+WORKDIR /app
+
+COPY go.mod ./
+COPY . .
+
+RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-w -s" -o server .
+
+# Stage 2: Ultra-lightweight runtime container
+FROM alpine:3.19
+
+RUN apk add --no-cache ca-certificates tzdata
+
+WORKDIR /app
+
+# Copy binary and static front-end assets
+COPY --from=builder /app/server /app/server
+COPY --from=builder /app/public /app/public
+
+EXPOSE 8080
+
+ENTRYPOINT ["/app/server"]
@@ -0,0 +1,20 @@
+version: '3.8'
+
+services:
+  date-wizard:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: date-wizard
+    restart: unless-stopped
+    ports:
+      - "8080:8080"
+    env_file:
+      - .env
+    labels:
+      - "traefik.enable=true"
+      - "traefik.http.routers.date-wizard.rule=Host(`date.example.com`)"
+      - "traefik.http.routers.date-wizard.entrypoints=websecure"
+      - "traefik.http.routers.date-wizard.tls=true"
+      - "traefik.http.routers.date-wizard.tls.certresolver=letsencrypt"
+      - "traefik.http.services.date-wizard.loadbalancer.server.port=8080"
@@ -0,0 +1,3 @@
+module date-wizard
+
+go 1.22
@@ -0,0 +1,186 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"net/smtp"
+	"os"
+	"strings"
+)
+
+type Activity struct {
+	Name string `json:"name"`
+	Icon string `json:"icon"`
+	Type string `json:"type"`
+}
+
+type SurveyPayload struct {
+	Activity   string     `json:"activity"`
+	Activities []Activity `json:"activities"`
+	Date       string     `json:"date"`
+	DateType   string     `json:"dateType"`
+	Name       string     `json:"name"`
+}
+
+type Response struct {
+	Success bool   `json:"success"`
+	Message string `json:"message"`
+}
+
+func main() {
+	loadEnv(".env")
+
+	port := os.Getenv("PORT")
+	if port == "" {
+		port = "8080"
+	}
+
+	webDir := os.Getenv("WEB_DIR")
+	if webDir == "" {
+		webDir = "public"
+	}
+
+	http.HandleFunc("/api/submit", handleSubmit)
+
+	// Serve static files from webDir directory
+	fs := http.FileServer(http.Dir(webDir))
+	http.Handle("/", fs)
+
+	log.Printf("Server starting on port %s (serving static files from %s)...", port, webDir)
+	if err := http.ListenAndServe(":"+port, nil); err != nil {
+		log.Fatalf("Server failed to start: %v", err)
+	}
+}
+
+func handleSubmit(w http.ResponseWriter, r *http.Request) {
+	if enableCORS(w, r) {
+		return
+	}
+
+	if r.Method != http.MethodPost {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	var payload SurveyPayload
+	err := json.NewDecoder(r.Body).Decode(&payload)
+	if err != nil {
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(Response{
+			Success: false,
+			Message: "Ungültige Anfragedaten.",
+		})
+		return
+	}
+
+	log.Printf("Received survey submission from %s for date %s (%s)", payload.Name, payload.Date, payload.Activity)
+
+	err = sendEmail(payload)
+	if err != nil {
+		log.Printf("Error sending email: %v", err)
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusInternalServerError)
+		json.NewEncoder(w).Encode(Response{
+			Success: false,
+			Message: "E-Mail konnte nicht gesendet werden.",
+		})
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode(Response{
+		Success: true,
+		Message: "Reservierung erfolgreich übermittelt!",
+	})
+}
+
+func enableCORS(w http.ResponseWriter, r *http.Request) bool {
+	w.Header().Set("Access-Control-Allow-Origin", "*")
+	w.Header().Set("Access-Control-Allow-Methods", "POST, GET, OPTIONS")
+	w.Header().Set("Access-Control-Allow-Headers", "Content-Type")
+
+	if r.Method == http.MethodOptions {
+		w.WriteHeader(http.StatusOK)
+		return true
+	}
+	return false
+}
+
+func sendEmail(payload SurveyPayload) error {
+	smtpHost := os.Getenv("SMTP_HOST")
+	smtpPort := os.Getenv("SMTP_PORT")
+	if smtpPort == "" {
+		smtpPort = "587"
+	}
+	smtpUser := os.Getenv("SMTP_USER")
+	smtpPass := os.Getenv("SMTP_PASS")
+	toEmail := os.Getenv("TO_EMAIL")
+	fromEmail := os.Getenv("FROM_EMAIL")
+	if fromEmail == "" {
+		fromEmail = smtpUser
+	}
+
+	if smtpHost == "" || toEmail == "" {
+		log.Println("HINWEIS: SMTP_HOST oder TO_EMAIL nicht konfiguriert. E-Mail-Versand übersprungen.")
+		return nil
+	}
+
+	var bodyBuilder bytes.Buffer
+	bodyBuilder.WriteString(fmt.Sprintf("From: %s\r\n", fromEmail))
+	bodyBuilder.WriteString(fmt.Sprintf("To: %s\r\n", toEmail))
+	bodyBuilder.WriteString(fmt.Sprintf("Subject: Neue Date-Reservierung von %s! 💕\r\n", payload.Name))
+	bodyBuilder.WriteString("MIME-Version: 1.0\r\n")
+	bodyBuilder.WriteString("Content-Type: text/plain; charset=UTF-8\r\n\r\n")
+
+	bodyBuilder.WriteString("Hallo!\r\n\r\n")
+	bodyBuilder.WriteString("Es gibt eine neue Date-Reservierung über deinen Date-Planer:\r\n\r\n")
+	bodyBuilder.WriteString(fmt.Sprintf("👤 Name: %s\r\n", payload.Name))
+	bodyBuilder.WriteString(fmt.Sprintf("📅 Datum: %s (%s)\r\n", payload.Date, payload.DateType))
+	bodyBuilder.WriteString(fmt.Sprintf("💌 Aktivität(en): %s\r\n\r\n", payload.Activity))
+
+	if len(payload.Activities) > 0 {
+		bodyBuilder.WriteString("Details der Aktivitäten:\r\n")
+		for _, act := range payload.Activities {
+			bodyBuilder.WriteString(fmt.Sprintf(" - %s %s (%s)\r\n", act.Icon, act.Name, act.Type))
+		}
+		bodyBuilder.WriteString("\r\n")
+	}
+
+	bodyBuilder.WriteString("Viel Spaß beim gemeinsamen Date! 💕\r\n")
+
+	auth := smtp.PlainAuth("", smtpUser, smtpPass, smtpHost)
+	addr := fmt.Sprintf("%s:%s", smtpHost, smtpPort)
+
+	return smtp.SendMail(addr, auth, fromEmail, []string{toEmail}, bodyBuilder.Bytes())
+}
+
+func loadEnv(filename string) {
+	file, err := os.Open(filename)
+	if err != nil {
+		return
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
+		if line == "" || strings.HasPrefix(line, "#") {
+			continue
+		}
+		parts := strings.SplitN(line, "=", 2)
+		if len(parts) == 2 {
+			key := strings.TrimSpace(parts[0])
+			val := strings.TrimSpace(parts[1])
+			val = strings.Trim(val, `"'`)
+			if os.Getenv(key) == "" {
+				os.Setenv(key, val)
+			}
+		}
+	}
+}
@@ -52,11 +52,49 @@
  }

  checkoutBtn.addEventListener("click", () => {
-    // Später: API / Mail-Versand / Kalendereintrag ausführen
-    summarySection.classList.add("hidden");
-    if (backLink) {
-      backLink.classList.add("hidden");
-    }
-    confirmationSection.classList.remove("hidden");
+    checkoutBtn.disabled = true;
+    const originalText = checkoutBtn.textContent;
+    checkoutBtn.textContent = "Wird übermittelt... 💌";
+
+    const payload = {
+      activity: selectedActivity,
+      activities: storedActivities,
+      date: selectedDate,
+      dateType: localStorage.getItem("selectedDateType") || "long",
+      name: selectedName,
+    };
+
+    fetch("/api/submit", {
+      method: "POST",
+      headers: {
+        "Content-Type": "application/json",
+      },
+      body: JSON.stringify(payload),
+    })
+      .then((res) => {
+        if (!res.ok) {
+          throw new Error("Fehler beim Übermitteln.");
+        }
+        return res.json();
+      })
+      .then((data) => {
+        if (data.success) {
+          summarySection.classList.add("hidden");
+          if (backLink) {
+            backLink.classList.add("hidden");
+          }
+          confirmationSection.classList.remove("hidden");
+        } else {
+          alert(data.message || "Es gab ein Problem bei der Übermittlung.");
+          checkoutBtn.disabled = false;
+          checkoutBtn.textContent = originalText;
+        }
+      })
+      .catch((err) => {
+        console.error("Submission error:", err);
+        alert("Übermittlung fehlgeschlagen. Bitte versuche es erneut.");
+        checkoutBtn.disabled = false;
+        checkoutBtn.textContent = originalText;
+      });
  });
 })();