init commit

.vscode/launch.json

@@ -0,0 +1,19 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+
+        {
+            "name": "Launch Package",
+            "type": "go",
+            "request": "launch",
+            "args": ["check-go-version=false"],
+            "mode": "auto",
+            "cwd": "${cwd}/Backend",
+            "program": "Backend/main.go",
+            "dlvFlags": ["--check-go-version=false"]
+        },
+    ]
+}

.vscode/settings.json

@@ -0,0 +1,14 @@
+{
+    "sqltools.connections": [
+        {
+            "previewLimit": 50,
+            "server": "localhost",
+            "port": 5432,
+            "askForPassword": true,
+            "driver": "PostgreSQL",
+            "name": "arbeitszeiten",
+            "database": "arbeitszeitmessung",
+            "username": "arbeit_zeit"
+        }
+    ]
+}

Backend/go.mod

@@ -0,0 +1,29 @@
+module Backend
+
+go 1.23.0
+
+require (
+	github.com/cilium/ebpf v0.16.0 // indirect
+	github.com/cosiner/argv v0.1.0 // indirect
+	github.com/cpuguy83/go-md2man/v2 v2.0.4 // indirect
+	github.com/derekparker/trie v0.0.0-20230829180723-39f4de51ef7d // indirect
+	github.com/go-delve/delve v1.23.0 // indirect
+	github.com/go-delve/liner v1.2.3-0.20231231155935-4726ab1d7f62 // indirect
+	github.com/google/go-dap v0.12.0 // indirect
+	github.com/hashicorp/golang-lru v1.0.2 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/lib/pq v1.10.9 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mattn/go-runewidth v0.0.16 // indirect
+	github.com/rivo/uniseg v0.4.7 // indirect
+	github.com/russross/blackfriday/v2 v2.1.0 // indirect
+	github.com/sirupsen/logrus v1.9.3 // indirect
+	github.com/spf13/cobra v1.8.1 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	go.starlark.net v0.0.0-20240725214946-42030a7cedce // indirect
+	golang.org/x/arch v0.9.0 // indirect
+	golang.org/x/exp v0.0.0-20240823005443-9b4947da3948 // indirect
+	golang.org/x/sys v0.24.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

Backend/go.sum

@@ -0,0 +1,60 @@
+github.com/cilium/ebpf v0.16.0 h1:+BiEnHL6Z7lXnlGUsXQPPAE7+kenAd4ES8MQ5min0Ok=
+github.com/cilium/ebpf v0.16.0/go.mod h1:L7u2Blt2jMM/vLAVgjxluxtBKlz3/GWjB0dMOEngfwE=
+github.com/cosiner/argv v0.1.0 h1:BVDiEL32lwHukgJKP87btEPenzrrHUjajs/8yzaqcXg=
+github.com/cosiner/argv v0.1.0/go.mod h1:EusR6TucWKX+zFgtdUsKT2Cvg45K5rtpCcWz4hK06d8=
+github.com/cpuguy83/go-md2man/v2 v2.0.4 h1:wfIWP927BUkWJb2NmU/kNDYIBTh/ziUX91+lVfRxZq4=
+github.com/cpuguy83/go-md2man/v2 v2.0.4/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/derekparker/trie v0.0.0-20230829180723-39f4de51ef7d h1:hUWoLdw5kvo2xCsqlsIBMvWUc1QCSsCYD2J2+Fg6YoU=
+github.com/derekparker/trie v0.0.0-20230829180723-39f4de51ef7d/go.mod h1:C7Es+DLenIpPc9J6IYw4jrK0h7S9bKj4DNl8+KxGEXU=
+github.com/go-delve/delve v1.23.0 h1:jYgZISZ14KAO3ys8kD07kjrowrygE9F9SIwnpz9xXys=
+github.com/go-delve/delve v1.23.0/go.mod h1:S3SLuEE2mn7wipKilTvk1p9HdTMnXXElcEpiZ+VcuqU=
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+github.com/go-delve/liner v1.2.3-0.20231231155935-4726ab1d7f62/go.mod h1:biJCRbqp51wS+I92HMqn5H8/A0PAhxn2vyOT+JqhiGI=
+github.com/google/go-dap v0.12.0 h1:rVcjv3SyMIrpaOoTAdFDyHs99CwVOItIJGKLQFQhNeM=
+github.com/google/go-dap v0.12.0/go.mod h1:tNjCASCm5cqePi/RVXXWEVqtnNLV1KTWtYOqu6rZNzc=
+github.com/hashicorp/golang-lru v1.0.2 h1:dV3g9Z/unq5DpblPpw+Oqcv4dU/1omnb4Ok8iPY6p1c=
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+github.com/mattn/go-runewidth v0.0.16 h1:E5ScNMtiwvlvB5paMFdw9p4kSQzbXFikJ5SQO6TULQc=
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+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
+github.com/rivo/uniseg v0.4.7 h1:WUdvkW8uEhrYfLC4ZzdpI2ztxP1I582+49Oc5Mq64VQ=
+github.com/rivo/uniseg v0.4.7/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
+github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf35Ld67mk=
+github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/sirupsen/logrus v1.9.3 h1:dueUQJ1C2q9oE3F7wvmSGAaVtTmUizReu6fjN8uqzbQ=
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+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+go.starlark.net v0.0.0-20240725214946-42030a7cedce h1:YyGqCjZtGZJ+mRPaenEiB87afEO2MFRzLiJNZ0Z0bPw=
+go.starlark.net v0.0.0-20240725214946-42030a7cedce/go.mod h1:YKMCv9b1WrfWmeqdV5MAuEHWsu5iC+fe6kYl2sQjdI8=
+golang.org/x/arch v0.9.0 h1:ub9TgUInamJ8mrZIGlBG6/4TqWeMszd4N8lNorbrr6k=
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+golang.org/x/exp v0.0.0-20240823005443-9b4947da3948/go.mod h1:akd2r19cwCdwSwWeIdzYQGa/EZZyqcOdwWiwj5L5eKQ=
+golang.org/x/sys v0.0.0-20211117180635-dee7805ff2e1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.24.0 h1:Twjiwq9dn6R1fQcyiK+wQyHWfaz/BJB+YIpzU/Cv3Xg=
+golang.org/x/sys v0.24.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
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Backend/main.go

@@ -0,0 +1,90 @@
+package main
+
+import (
+	"Backend/models"
+	"database/sql"
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"net/url"
+	"os"
+	"strconv"
+
+	_ "github.com/lib/pq"
+)
+
+var DB *sql.DB
+
+func main() {
+	var err error
+	dbConnStr := getDBConn()
+	DB, err = sql.Open("postgres", dbConnStr)
+	if err!= nil {
+        log.Fatal(err)
+    }
+	defer DB.Close()
+
+	http.HandleFunc("/time", timeHandler)
+
+	fmt.Println("Server is running at http://localhost:8080")
+	log.Fatal(http.ListenAndServe(":8080", nil))
+}
+
+func timeHandler(w http.ResponseWriter, r *http.Request) {
+	switch r.Method {
+	case "PUT":
+		createBooking(w, r)
+	default:
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+	}
+}
+
+func createBooking(w http.ResponseWriter, r *http.Request) {
+
+	booking := getBooking(r.URL.Query())
+	if models.VerifyBooking(booking) {
+		err := models.InsertBooking(booking, DB)
+		if err == fmt.Errorf("the same booking already exists") {
+			http.Error(w, "Booking already exists", http.StatusConflict)
+            return
+		}
+		if err != nil {
+            log.Println("Error inserting booking: ", err)
+            http.Error(w, "Internal Server Error", http.StatusInternalServerError)
+            return
+        }
+		w.WriteHeader(http.StatusAccepted)
+		json.NewEncoder(w).Encode(booking)
+	}
+	w.WriteHeader(http.StatusBadRequest)
+}
+
+func getBooking(query_params url.Values) models.Booking {
+	bookingType, err := strconv.Atoi(query_params.Get("bookingType"))
+	if err!= nil {
+        log.Println("Error parsing bookingType: ", err)
+        return models.Booking{}
+    }
+	return models.Booking{
+		CradID:      query_params.Get("cardID"),
+		ReaderID:    query_params.Get("readerID"),
+		BookingType: bookingType,
+	}
+}
+
+func getDBConn() string {
+	dbHost := getEnv("POSTGRES_HOST", "localhost")
+	dbName := getEnv("POSTGRES_DB", "arbeitszeitmessung")
+	dbUser := getEnv("POSTGRES_USER", "arbeit_zeit")
+	dbPassword := getEnv("POSTGRES_PASS", "password")
+
+	return fmt.Sprintf("postgres://%s:%s@%s:5432/%s?sslmode=disable", dbUser, dbPassword, dbHost, dbName)
+}
+
+func getEnv(key, fallback string) string {
+    if value, ok := os.LookupEnv(key); ok {
+        return value
+    }
+    return fallback
+}

Backend/models/booking.go

@@ -0,0 +1,62 @@
+package models
+
+import (
+	"database/sql"
+	"fmt"
+	"log"
+)
+
+type Booking struct {
+	CradID      string `json:"cradID"`
+	ReaderID    string `json:"readerID"`
+	BookingType int `json:"bookingTyp"`
+}
+
+type SameBookingError struct{}
+
+func (e SameBookingError) Error() string {
+	return "the same booking already exists!"
+}
+
+func VerifyBooking(b Booking) bool {
+	if b.CradID == "" || b.ReaderID == "" || b.BookingType == 0 {
+		return false
+	}
+	return true
+}
+
+func InsertBooking(b Booking, db *sql.DB) error {
+	if !checkLastBooking(b, db) {
+		return fmt.Errorf("the same booking already exists")
+    }
+	stmt, err := db.Prepare((`INSERT INTO zeiten (card_id, reader_id, booking_type) VALUES ($1, $2, $3)`))
+	if err != nil {
+		return err
+	}
+	_, err = stmt.Query(b.CradID, b.ReaderID, b.BookingType)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func checkLastBooking(b Booking, db *sql.DB) bool {
+	var booking_type int
+	stmt, err := db.Prepare((`SELECT booking_type FROM "zeiten" WHERE "card_id" = $1 ORDER BY "logged_time" DESC LIMIT 1;`))
+	if err != nil {
+		log.Fatalf("Error preparing query: %v", err)
+        return false
+    }
+	err = stmt.QueryRow(b.CradID).Scan(&booking_type)
+	if err == sql.ErrNoRows {
+		return true
+	}
+	if err!= nil {
+        log.Println("Error checking last booking: ", err)
+        return false
+    }
+	if booking_type == b.BookingType {
+		return false
+	}
+	return true
+}

Docker/.env

@@ -0,0 +1,5 @@
+POSTGRES_USER=arbeit_zeit
+POSTGRES_PASSWORD=password
+POSTGRES_PATH=./database
+POSTGRES_DB=arbeitszeitmessung
+# EXPOSED_PORT=8080

Docker/docker-compose.yml

@@ -0,0 +1,32 @@
+name: Arbeitszeitmessung-Main
+services:
+  db:
+    image: postgres:16
+    restart: unless-stopped
+    env_file:
+      - .env
+    environment:
+      POSTGRES_USER: ${POSTGRES_USER}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
+      POSTGRES_DB: ${POSTGRES_DB}
+      PGDATA: /var/lib/postgresql/data/pg_data
+    volumes:
+      - ${POSTGRES_PATH}:/var/lib/postgresql/data
+    ports:
+      - 5432:5432
+
+  adminer:
+    image: adminer
+    restart: unless-stopped
+    ports:
+      - 8000:8080
+  backend:
+    build: ../Backend
+    image: git.letsstein.de/tom/arbeitszeit-backend
+    env_file:
+      - .env
+    environment:
+      POSTGRES_HOST: db
+      POSTGRES_DB: ${POSTGRES_DB}
+      POSTGRES_USER: ${POSTGRES_USER}
+      POSTGRES_PASS: ${POSTGRES_PASSWORD}

db.sql

@@ -0,0 +1,23 @@
+-- @block create table
+CREATE TABLE zeiten (
+    id SERIAL PRIMARY KEY,
+    logged_time TIMESTAMP DEFAULT NOW(),
+    card_id VARCHAR,
+    reader_id VARCHAR,
+    booking_type INTEGER
+);
+-- @block insert data
+INSERT INTO zeiten (card_id, reader_id, booking_type)
+VALUES ('test_card', 'test_reader', '2');
+-- @block select
+SELECT *
+FROM zeiten;
+-- @block select last entry from card id
+SELECT *
+FROM "zeiten"
+WHERE "card_id" = 'test_card'
+    AND "logged_time" >= now()::date + interval '1h'
+ORDER BY "logged_time" DESC
+LIMIT 1;
+-- @block delete table
+DROP TABLE IF EXISTS zeiten;