feat(gateway): added first implement of the Gateway (MQTT, Influx, REST)

Signed-off-by: Klagarge <remi@heredero.ch>
2025-04-14 22:39:47 +02:00
parent d33a6a1d02
commit e6ef490314
14 changed files with 928 additions and 0 deletions
--- a/.env.template
+++ b/.env.template
@@ -3,5 +3,8 @@ INFLUXDB_PASSWORD=
 INFLUXDB_TOKEN=
 INFLUXDB_ORG=
 INFLUXDB_BUCKET=
+MQTT_URL=
 MQTT_USERNAME=
 MQTT_PASSWORD=
+REST_USERNAME=
+REST_PASSWORD=
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -0,0 +1,25 @@
+variables:
+  DOCKER_IMAGE: registry.forge.hefr.ch/team-raclette/project-softweng/gateway:latest
+
+default:
+  image: $DOCKER_IMAGE
+
+stages:
+  - build-docker
+
+# This job runs only when Dockerfile changes
+docker-build:
+  image: docker:latest
+  stage: build-docker
+  services:
+    - docker:dind
+  script:
+    - docker build -t $DOCKER_IMAGE -f gateway/Dockerfile .
+    - echo $CI_REGISTRY_PASSWORD | docker login -u $CI_REGISTRY_USER --password-stdin $CI_REGISTRY
+    - docker push $DOCKER_IMAGE
+  rules:
+    - if: $GITLAB_CI == 'false' # Only run in GitLab CI
+      when: never
+    - changes:
+        - gateway/Dockerfile
+        - gateway/src/*
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -6,6 +6,32 @@ volumes:
  rabbitmq_data:

 services:
+  gateway:
+    image: registry.forge.hefr.ch/team-raclette/project-softweng/gateway:latest
+    container_name: gateway
+    restart: unless-stopped
+    environment:
+      - INFLUXDB_TOKEN=$INFLUXDB_TOKEN
+      - INFLUXDB_ORG=$INFLUXDB_ORG
+      - INFLUXDB_BUCKET=$INFLUXDB_BUCKET
+      - MQTT_USERNAME=$MQTT_USERNAME
+      - MQTT_PASSWORD=$MQTT_PASSWORD
+      - REST_USERNAME=$REST_USERNAME
+      - REST_PASSWORD=$REST_PASSWORD
+
+      - INFLUXDB_URL=http://influx.mse.kb28.ch
+      - CLIENT_ID=Gateway-SoftwEng
+      - MQTT_URL=http://mqtt.mse.kb28.ch
+      - MEASUREMENT_NAME=THC
+    labels:
+      - "traefik.enable=true"
+      - "traefik.http.routers.Gateway-http.entrypoints=http"
+      - "traefik.http.routers.Gateway-http.rule=Host(`rest.mse.kb28.ch`)"
+      - "traefik.http.middlewares.Gateway-redirect.redirectscheme.scheme=https"
+      - "traefik.http.routers.Gateway-https.entrypoints=https"
+      - "traefik.http.routers.Gateway-https.rule=Host(`rest.mse.kb28.ch`)"
+      - "traefik.http.routers.Gateway-https.tls.certResolver=letsencrypt"
+      - "traefik.http.services.Gateway-https.loadbalancer.server.port=8080"
  influxdb:
    image: influxdb:2
    container_name: influxdb
@@ -23,6 +49,15 @@ services:
      - DOCKER_INFLUXDB_INIT_ADMIN_TOKEN=$INFLUXDB_TOKEN
      - DOCKER_INFLUXDB_INIT_ORG=$INFLUXDB_ORG
      - DOCKER_INFLUXDB_INIT_BUCKET=$INFLUXDB_BUCKET
+    labels:
+      - "traefik.enable=true"
+      - "traefik.http.routers.influx-http.entrypoints=http"
+      - "traefik.http.routers.influx-http.rule=Host(`influx.mse.kb28.ch`)"
+      - "traefik.http.middlewares.influx-redirect.redirectscheme.scheme=https"
+      - "traefik.http.routers.influx-https.entrypoints=https"
+      - "traefik.http.routers.influx-https.rule=Host(`influx.mse.kb28.ch`)"
+      - "traefik.http.routers.influx-https.tls.certResolver=letsencrypt"
+      - "traefik.http.services.influx-https.loadbalancer.server.port=8086"
  rabbitmq:
    image: rabbitmq:3-management-alpine
    container_name: rabbitmq
@@ -39,3 +74,12 @@ services:
      - RABBITMQ_DEFAULT_PASS=$MQTT_PASSWORD
    command:
      sh -c "rabbitmq-plugins enable rabbitmq_mqtt && rabbitmq-server"
+    labels:
+      - "traefik.enable=true"
+      - "traefik.http.routers.mqtt-http.entrypoints=http"
+      - "traefik.http.routers.mqtt-http.rule=Host(`mqtt.mse.kb28.ch`)"
+      - "traefik.http.middlewares.mqtt-redirect.redirectscheme.scheme=https"
+      - "traefik.http.routers.mqtt-https.entrypoints=https"
+      - "traefik.http.routers.mqtt-https.rule=Host(`mqtt.mse.kb28.ch`)"
+      - "traefik.http.routers.mqtt-https.tls.certResolver=letsencrypt"
+      - "traefik.http.services.mqtt-https.loadbalancer.server.port=1883"
--- a/gateway/Dockerfile
+++ b/gateway/Dockerfile
@@ -0,0 +1,27 @@
+FROM golang:1.23-alpine AS builder
+
+WORKDIR /app
+
+COPY ./src/go.mod ./src/go.sum ./
+RUN go mod tidy
+
+COPY ./src .
+#RUN CGO_ENABLED=0 go build -ldflags="-w -s" -o /gateway .
+RUN go build -o /gateway .
+
+
+FROM alpine:latest AS certs
+RUN apk --no-cache add ca-certificates
+
+FROM scratch AS final
+LABEL   org.opencontainers.image.authors="remi.heredero@hevs.ch" \
+        org.opencontainers.image.title="Gateway for SoftwEng course" \
+        org.opencontainers.image.description="This container is an application for the lab on SoftwEng course" \
+        org.opencontainers.image.source="https://gitlab.forge.hefr.ch/team-raclette/project-softweng/-/tree/main/gateway?ref_type=heads"
+
+COPY --from=builder /gateway /gateway
+COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+
+EXPOSE 8080
+
+ENTRYPOINT ["/gateway"]
--- a/gateway/src/Connection.go
+++ b/gateway/src/Connection.go
@@ -0,0 +1,239 @@
+package main
+
+import (
+	_ "crypto/md5"
+	_ "gateway-softweng/docs"
+	paho "github.com/eclipse/paho.mqtt.golang"
+	"github.com/gin-gonic/gin"
+	influxdb2 "github.com/influxdata/influxdb-client-go/v2"
+	"github.com/influxdata/influxdb-client-go/v2/api"
+	"github.com/labstack/gommon/log"
+	swaggerFiles "github.com/swaggo/files"
+	ginSwagger "github.com/swaggo/gin-swagger"
+	"net/http"
+	"os"
+)
+
+type Gateway struct {
+	username  string
+	password  string
+	mqtt      paho.Client
+	rest      *gin.Engine
+	restGroup *gin.RouterGroup
+	accounts  gin.Accounts
+	influx    influxdb2.Client
+	influxApi api.WriteAPIBlocking
+}
+
+// @Summary Ping test endpoint
+// @Description get ping response
+// @Tags ping
+// @Accept json
+// @Produce json
+// @Success 200 {string} string "pong"
+// @Router /ping [get]
+func pingHandler(c *gin.Context) {
+	c.String(http.StatusOK, "pong")
+}
+
+// getUsers initializes user account.
+//
+// It performs the following actions:
+//   - Creates user accounts with usernames and password provided by environnement variable
+//   - Stores the credentials for basic authentication.
+func (gh *Gateway) getUser() {
+	// Create username
+	ok := false
+	gh.username, ok = os.LookupEnv("REST_USERNAME")
+	if !ok {
+		log.Fatal("REST_USERNAME not set")
+	}
+
+	gh.password, ok = os.LookupEnv("REST_PASSWORD")
+	if !ok {
+		log.Fatal("REST_PASSWORD not set")
+	}
+
+	gh.accounts = gin.Accounts{}
+	gh.accounts[gh.username] = gh.password
+
+}
+
+// createRestGateway sets up the REST API using the Gin framework.
+// It defines the following routes:
+//   - A public ping test endpoint for health checks.
+//   - A Swagger documentation endpoint for API documentation.
+//   - A secured group of endpoints for commands and data requests, protected by basic authentication.
+//
+// Behavior:
+//   - The `/ping` endpoint responds with "pong" to test server availability.
+//   - The `/swagger/*any` endpoint serves the Swagger UI for API documentation.
+//   - The `/raclette` group includes:
+//   - A POST route for publishing commands to MQTT.
+//   - A GET route for requesting data from InfluxDB.
+//
+// Security:
+//   - The `/raclette` group requires basic authentication using credentials generated for each user.
+func (gh *Gateway) createRestGateway() {
+	// Create a new Gin router
+	gh.rest = gin.Default()
+
+	gh.rest.GET("/ping", pingHandler)
+
+	// Swagger documentation route
+	gh.rest.GET("/swagger/*any", ginSwagger.WrapHandler(swaggerFiles.Handler))
+
+	// Create a new router group with basic authentication for /raclette
+	gh.restGroup = gh.rest.Group("/raclette", gin.BasicAuth(gh.accounts))
+
+	// Define the route for the publish command
+	gh.restGroup.POST("", func(c *gin.Context) {
+		ret := gh.publishCommand(c)
+		if ret == nil {
+			c.JSON(http.StatusOK, gin.H{"status": "ok"})
+		} else {
+			c.JSON(http.StatusInternalServerError, gin.H{"error": ret.Error()})
+		}
+	})
+
+	// Define the route for the publish command (GET)
+	gh.restGroup.GET("", func(c *gin.Context) {
+		ret := gh.requestInflux(c)
+		if ret != nil {
+			c.JSON(http.StatusInternalServerError, gin.H{"error": ret.Error()})
+		}
+	})
+}
+
+// createMQTTGateway initializes the MQTT client and sets up subscriptions.
+//
+// It subscribes to the following topics:
+//   - "+/+/+/update": For device state updates.
+//
+// The OnConnect callback ensures that subscriptions are re-established after reconnecting.
+//
+// Returns:
+//   - error: An error if the MQTT client fails to connect or subscribe to topics.
+func (gh *Gateway) createMQTTGateway() error {
+
+	// Get env variables and set default values if not set
+	MQTT_URL, ok := os.LookupEnv("MQTT_URL")
+	if !ok {
+		log.Error("MQTT_URL not set, using default value: tcp://mqtt.mse.kb28.ch:1883")
+		MQTT_URL = "tcp://mqtt.mse.kb28.ch:1883"
+	}
+
+	CLIENT_ID, ok := os.LookupEnv("CLIENT_ID")
+	if !ok {
+		log.Error("CLIENT_ID not set, using default value: Gateway-SoftwEng")
+		CLIENT_ID = "Gateway-SoftwEng"
+	}
+
+	// Get env variables for MQTT credentials, panic if not set
+	MQTT_USERNAME, ok := os.LookupEnv("MQTT_USERNAME")
+	if !ok {
+		log.Fatal("MQTT_USERNAME not set")
+	}
+	MQTT_PASSWORD, ok := os.LookupEnv("MQTT_PASSWORD")
+	if !ok {
+		log.Fatal("MQTT_PASSWORD not set")
+	}
+
+	// Create MQTT client
+	option := paho.NewClientOptions()
+	option.AddBroker(MQTT_URL)
+	option.SetClientID(CLIENT_ID)
+	option.SetUsername(MQTT_USERNAME)
+	option.SetPassword(MQTT_PASSWORD)
+	option.SetAutoReconnect(true)
+	option.OnConnect = func(client paho.Client) {
+
+		// Subscribe to update
+		token := gh.mqtt.Subscribe("+/+/+/update", 0, gh.processUpdate)
+		if token.Wait() && token.Error() != nil {
+			log.Error(token.Error())
+			client.Disconnect(1000) // Disconnect from the broker after 1000ms
+		}
+
+	}
+	gh.mqtt = paho.NewClient(option)
+	token := gh.mqtt.Connect()
+	if token.Wait() && token.Error() != nil {
+		return token.Error()
+	}
+	return nil
+}
+
+// createInfluxGateway initializes the InfluxDB client.
+func (gh *Gateway) createInfluxGateway() {
+
+	// Get env variables and set default values if not set
+	INFLUXDB_ORG, ok := os.LookupEnv("INFLUXDB_ORG")
+	if !ok {
+		log.Error("INFLUXDB_ORG not set, using default value: raclette")
+		INFLUXDB_ORG = "raclette"
+	}
+
+	INFLUXDB_BUCKET, ok := os.LookupEnv("INFLUXDB_BUCKET")
+	if !ok {
+		log.Error("INFLUXDB_BUCKET not set, using default value: raclette")
+		INFLUXDB_BUCKET = "raclette"
+	}
+
+	// Get env variables and set default values if not set
+	INFLUXDB_URL, ok := os.LookupEnv("INFLUXDB_URL")
+	if !ok {
+		log.Error("INFLUXDB_URL not set, using default value: http://influx.mse.kb28.ch")
+		INFLUXDB_URL = "http://influx.mse.kb28.ch"
+	}
+
+	// Get env variables for InfluxDB credentials, panic if not set
+	INFLUXDB_TOKEN, ok := os.LookupEnv("INFLUXDB_TOKEN")
+	if !ok {
+		log.Fatal("INFLUXDB_TOKEN not set")
+	}
+
+	// Initialize the InfluxDB client
+	gh.influx = influxdb2.NewClient(INFLUXDB_URL, INFLUXDB_TOKEN)
+	gh.influxApi = gh.influx.WriteAPIBlocking(INFLUXDB_ORG, INFLUXDB_BUCKET)
+	gh.influxApi.EnableBatching()
+}
+
+// NewGateway initializes the Gateway instance by setting up the necessary components.
+//
+// It performs the following actions:
+//   - Initializes the InfluxDB client using the provided token.
+//   - Creates user account with unique credentials and InfluxDB write APIs.
+//   - Sets up the REST API server with routes for health checks, Swagger documentation, and secured endpoints.
+//   - Connects to the MQTT broker and subscribes to relevant topics.
+//
+// Returns:
+//   - *Gateway: A pointer to the initialized Gateway instance.
+//   - error: An error if any of the initialization steps fail.
+func NewGateway() (*Gateway, error) {
+	var gh = Gateway{}
+	var err error
+
+	// Initialize the InfluxDB client
+	gh.createInfluxGateway()
+
+	// Generate user accounts and credentials
+	gh.getUser()
+
+	// Set up the REST API server
+	gh.createRestGateway()
+
+	// Initialize the MQTT client and subscriptions
+	err = gh.createMQTTGateway()
+	if err != nil {
+		return nil, err
+	}
+
+	// Start the HTTP server
+	err = gh.rest.Run(":8080")
+	if err != nil {
+		return nil, err
+	}
+
+	return &gh, nil
+}
--- a/gateway/src/ProcessUpdate.go
+++ b/gateway/src/ProcessUpdate.go
@@ -0,0 +1,77 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"os"
+	"strings"
+	"time"
+
+	paho "github.com/eclipse/paho.mqtt.golang"
+	influxdb "github.com/influxdata/influxdb-client-go/v2"
+	"github.com/labstack/gommon/log"
+)
+
+type dataPoints = map[string]interface{}
+
+type updateEvent struct {
+	State      string     `json:"state"`
+	DataPoints dataPoints `json:"values"`
+}
+
+// processUpdate processes device state updates received via MQTT and writes data points to InfluxDB.
+//
+// Parameters:
+//   - _ : The MQTT client instance (unused).
+//   - message: The MQTT message containing the topic and payload.
+func (m *Gateway) processUpdate(_ paho.Client, message paho.Message) {
+	// Parse the MQTT topic to extract user, room, and device information.
+	topic := strings.Split(message.Topic(), "/")
+	if len(topic) != 4 {
+		log.Errorf("invalid topic: %s", message.Topic())
+		return
+	}
+
+	user := topic[0]
+	room := topic[1]
+	device := topic[2]
+
+	// Decode the message payload into an updateEvent structure.
+	var event updateEvent
+	err := json.Unmarshal(message.Payload(), &event)
+	if err != nil {
+		log.Errorf("invalid update event payload: %s", string(message.Payload()))
+	}
+
+	// Skip processing if no data points are provided.
+	if event.DataPoints == nil || len(event.DataPoints) == 0 {
+		return
+	}
+
+	// Prepare the InfluxDB point with tags and fields.
+	MEASUREMENT_NAME, ok := os.LookupEnv("MEASUREMENT_NAME")
+	if !ok {
+		log.Error("MEASUREMENT_NAME not set, using default value: softweng")
+		MEASUREMENT_NAME = "softweng"
+	}
+	point := influxdb.NewPointWithMeasurement(MEASUREMENT_NAME).
+		SetTime(time.Now()).
+		AddTag("user", user).
+		AddTag("room", room).
+		AddTag("device", device)
+	for n, dp := range event.DataPoints {
+		point.AddField(n, dp)
+	}
+
+	// Write the point to InfluxDB and handle errors.
+	err = m.influxApi.WritePoint(context.Background(), point)
+	if err != nil {
+		log.Errorf("failed to write data points to influx: %v", err)
+	}
+
+	// Flush the InfluxDB client to ensure data is written.
+	err = m.influxApi.Flush(context.Background())
+	if err != nil {
+		log.Errorf("failed to flush data points to influx: %v", err)
+	}
+}
--- a/gateway/src/PublishCommand.go
+++ b/gateway/src/PublishCommand.go
@@ -0,0 +1,59 @@
+package main
+
+import (
+	"errors"
+	_ "gateway-softweng/docs"
+
+	_ "github.com/eclipse/paho.mqtt.golang"
+	"github.com/gin-gonic/gin"
+)
+
+// Command represents the structure of the command to be published
+// @Description Command structure for publishing
+type Command struct {
+	Command string `json:"command" example:"UP" binding:"required"`
+}
+
+// @Summary Publish command
+// @Description Publish a command to a specific device in a room
+// @Tags commands
+// @Accept json
+// @Produce json
+// @Security BasicAuth
+// @Param room query string true "Room name" example(Garage)
+// @Param device query string true "Device name" example(Door)
+// @Param command body main.Command true "Command to publish"
+// @Success 200 {object} map[string]string "status:ok"
+// @Failure 500 {object} gin.H
+// @Router /raclette [post]
+func (gh *Gateway) publishCommand(c *gin.Context) error {
+	// Get the user from the authenticated context
+	user := c.MustGet(gin.AuthUserKey).(string)
+
+	// Get room and device from the query parameters
+	room, ret := c.GetQuery("room")
+	if !ret {
+		return errors.New(`no room found`)
+	}
+	device, ret := c.GetQuery("device")
+	if !ret {
+		return errors.New(`no device found`)
+	}
+
+	// Define the JSON structure for the command
+	var json Command
+
+	// Bind the JSON payload to the structure
+	err := c.Bind(&json)
+	if err != nil {
+		return err
+	}
+
+	// Publish the command to the MQTT broker
+	topic := user + "/" + room + "/" + device + "/command/" + json.Command
+	token := gh.mqtt.Publish(topic, 1, false, "")
+	if token.Wait() && token.Error() != nil {
+		return token.Error()
+	}
+	return nil
+}
--- a/gateway/src/RequestInflux.go
+++ b/gateway/src/RequestInflux.go
@@ -0,0 +1,90 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	_ "github.com/eclipse/paho.mqtt.golang"
+	"github.com/gin-gonic/gin"
+	"github.com/labstack/gommon/log"
+	"golang.org/x/net/context"
+	"net/http"
+	"os"
+)
+
+// swagger:model
+// @Description Example response for Garage Door status
+type GarageDoorExample struct {
+	// example: true
+	IsClosed bool `json:"IsClosed"`
+	// example: false
+	IsDownButtonPressed bool `json:"IsDownButtonPressed"`
+	// example: false
+	IsIRSensor bool `json:"IsIRSensor"`
+	// example: false
+	IsOpen bool `json:"IsOpen"`
+	// example: false
+	IsUpButtonPressed bool `json:"IsUpButtonPressed"`
+}
+
+// @Summary Request Influx data
+// @Description Request data from InfluxDB for a specific device in a room
+// @Tags request
+// @Accept json
+// @Produce json
+// @Security BasicAuth
+// @Param room query string true "Room name" example(Garage)
+// @Param device query string true "Device name" example(Door)
+// @Success 200 {object} GarageDoorExample "Returns a map of field names to their latest values."
+// @Failure 500 {object} gin.H
+// @Router /raclette [get]
+func (gh *Gateway) requestInflux(c *gin.Context) error {
+	// Get the user from the authenticated context
+	user := c.MustGet(gin.AuthUserKey).(string)
+
+	// Get room and device from the query parameters
+	room, ret := c.GetQuery("room")
+	if !ret {
+		return errors.New(`no room found`)
+	}
+	device, ret := c.GetQuery("device")
+	if !ret {
+		return errors.New(`no device found`)
+	}
+
+	org := user
+	bucket := user
+
+	queryAPI := gh.influx.QueryAPI(org)
+	MEASUREMENT_NAME, ok := os.LookupEnv("MEASUREMENT_NAME")
+	if !ok {
+		log.Error("MEASUREMENT_NAME not set, using default value: softweng")
+		MEASUREMENT_NAME = "softweng"
+	}
+	// The Flux query uses a large range (-1000d) and aggregates the latest values.
+	// This ensures we always get the most recent data, even if the database contains old entries.
+	query := fmt.Sprintf(`from(bucket: %q)
+				|> range(start: -1000d)
+ 				|> filter(fn: (r) => r["_measurement"] == %q)
+				|> filter(fn: (r) => r["room"] == %q)
+				|> filter(fn: (r) => r["device"] == %q)
+				|> aggregateWindow(every: 1000d, fn: last, createEmpty: false)
+				`, bucket, MEASUREMENT_NAME, room, device)
+	results, err := queryAPI.Query(context.Background(), query)
+	if err != nil {
+		log.Fatal(err)
+	}
+	values := make(map[string]interface{})
+	for results.Next() {
+		record := results.Record()
+		field := record.Field()
+		value := record.Value()
+		values[field] = value
+		fmt.Println(results.Record())
+	}
+	if err := results.Err(); err != nil {
+		log.Fatal(err)
+	}
+
+	c.JSON(http.StatusOK, values)
+	return nil
+}
--- a/gateway/src/docs/docs.go
+++ b/gateway/src/docs/docs.go
@@ -0,0 +1,41 @@
+// Package docs Code generated by swaggo/swag. DO NOT EDIT
+package docs
+
+import "github.com/swaggo/swag"
+
+const docTemplate = `{
+    "schemes": {{ marshal .Schemes }},
+    "swagger": "2.0",
+    "info": {
+        "description": "{{escape .Description}}",
+        "title": "{{.Title}}",
+        "contact": {},
+        "version": "{{.Version}}"
+    },
+    "host": "{{.Host}}",
+    "basePath": "{{.BasePath}}",
+    "paths": {},
+    "securityDefinitions": {
+        "BasicAuth": {
+            "type": "basic"
+        }
+    }
+}`
+
+// SwaggerInfo holds exported Swagger Info so clients can modify it
+var SwaggerInfo = &swag.Spec{
+	Version:          "1.0",
+	Host:             "rest.mse.kb28.ch",
+	BasePath:         "/",
+	Schemes:          []string{},
+	Title:            "Swagger SoftwEng API",
+	Description:      "REST API for the SoftwEng course in MSE",
+	InfoInstanceName: "swagger",
+	SwaggerTemplate:  docTemplate,
+	LeftDelim:        "{{",
+	RightDelim:       "}}",
+}
+
+func init() {
+	swag.Register(SwaggerInfo.InstanceName(), SwaggerInfo)
+}
--- a/gateway/src/docs/swagger.json
+++ b/gateway/src/docs/swagger.json
@@ -0,0 +1,17 @@
+{
+    "swagger": "2.0",
+    "info": {
+        "description": "REST API for the SoftwEng course in MSE",
+        "title": "Swagger SoftwEng API",
+        "contact": {},
+        "version": "1.0"
+    },
+    "host": "rest.mse.kb28.ch",
+    "basePath": "/",
+    "paths": {},
+    "securityDefinitions": {
+        "BasicAuth": {
+            "type": "basic"
+        }
+    }
+}
--- a/gateway/src/docs/swagger.yaml
+++ b/gateway/src/docs/swagger.yaml
@@ -0,0 +1,12 @@
+basePath: /
+host: rest.mse.kb28.ch
+info:
+  contact: {}
+  description: REST API for the SoftwEng course in MSE
+  title: Swagger SoftwEng API
+  version: "1.0"
+paths: {}
+securityDefinitions:
+  BasicAuth:
+    type: basic
+swagger: "2.0"
--- a/gateway/src/go.mod
+++ b/gateway/src/go.mod
@@ -0,0 +1,64 @@
+module gateway-softweng
+
+go 1.23.0
+
+toolchain go1.23.3
+
+require (
+	github.com/eclipse/paho.mqtt.golang v1.5.0
+	github.com/gin-gonic/gin v1.10.0
+	github.com/influxdata/influxdb-client-go/v2 v2.14.0
+	github.com/labstack/gommon v0.4.0
+	github.com/swaggo/files v1.0.1
+	github.com/swaggo/gin-swagger v1.6.0
+	github.com/swaggo/swag v1.16.4
+	golang.org/x/net v0.38.0
+)
+
+require (
+	github.com/KyleBanks/depth v1.2.1 // indirect
+	github.com/PuerkitoBio/purell v1.1.1 // indirect
+	github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 // indirect
+	github.com/apapsch/go-jsonmerge/v2 v2.0.0 // indirect
+	github.com/bytedance/sonic v1.11.6 // indirect
+	github.com/bytedance/sonic/loader v0.1.1 // indirect
+	github.com/cloudwego/base64x v0.1.4 // indirect
+	github.com/cloudwego/iasm v0.2.0 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.3 // indirect
+	github.com/gin-contrib/sse v0.1.0 // indirect
+	github.com/go-openapi/jsonpointer v0.19.5 // indirect
+	github.com/go-openapi/jsonreference v0.19.6 // indirect
+	github.com/go-openapi/spec v0.20.4 // indirect
+	github.com/go-openapi/swag v0.19.15 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-playground/validator/v10 v10.20.0 // indirect
+	github.com/goccy/go-json v0.10.2 // indirect
+	github.com/google/uuid v1.3.1 // indirect
+	github.com/gorilla/websocket v1.5.3 // indirect
+	github.com/influxdata/line-protocol v0.0.0-20200327222509-2487e7298839 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.7 // indirect
+	github.com/leodido/go-urn v1.4.0 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/oapi-codegen/runtime v1.0.0 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
+	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
+	github.com/ugorji/go/codec v1.2.12 // indirect
+	github.com/valyala/bytebufferpool v1.0.0 // indirect
+	github.com/valyala/fasttemplate v1.2.2 // indirect
+	golang.org/x/arch v0.8.0 // indirect
+	golang.org/x/crypto v0.36.0 // indirect
+	golang.org/x/sync v0.12.0 // indirect
+	golang.org/x/sys v0.31.0 // indirect
+	golang.org/x/text v0.23.0 // indirect
+	golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d // indirect
+	google.golang.org/protobuf v1.34.1 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
--- a/gateway/src/go.sum
+++ b/gateway/src/go.sum
@@ -0,0 +1,203 @@
+github.com/KyleBanks/depth v1.2.1 h1:5h8fQADFrWtarTdtDudMmGsC7GPbOAu6RVB3ffsVFHc=
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+github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
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--- a/gateway/src/main.go
+++ b/gateway/src/main.go
@@ -0,0 +1,27 @@
+// @title Swagger SoftwEng API
+// @version 1.0
+// @description REST API for the SoftwEng course in MSE
+// @host rest.mse.kb28.ch
+// @BasePath /
+// @securityDefinitions.basic BasicAuth
+// @in header
+// @name Authorization
+package main
+
+import (
+	_ "gateway-softweng/docs"
+	"os"
+	"os/signal"
+	"syscall"
+)
+
+func main() {
+	_, err := NewGateway()
+	if err != nil {
+		panic(err)
+	}
+
+	keepAlive := make(chan os.Signal)
+	signal.Notify(keepAlive, os.Interrupt, syscall.SIGTERM)
+	<-keepAlive
+}