✨ Adds locking and gotify alerts

go.mod

@@ -8,6 +8,7 @@ require (
 )
 
 require (
+	github.com/joho/godotenv v1.5.1 // indirect
 	github.com/mattn/go-colorable v0.1.14 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/valyala/bytebufferpool v1.0.0 // indirect

go.sum

@@ -1,5 +1,7 @@
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
+github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
 github.com/labstack/echo/v4 v4.13.3 h1:pwhpCPrTl5qry5HRdM5FwdXnhXSLSY+WE+YQSeCaafY=
 github.com/labstack/echo/v4 v4.13.3/go.mod h1:o90YNEeQWjDozo584l7AwhJMHN0bOC4tAfg+Xox9q5g=
 github.com/labstack/gommon v0.4.2 h1:F8qTUNXgG1+6WQmqoUWnz8WiEU60mXVVw0P4ht1WRA0=

main.go

@@ -1,12 +1,19 @@
 package main
 
 import (
+	"bytes"
+	"encoding/json"
 	"errors"
 	"fmt"
+	"io"
 	"net/http"
+	"os"
+	"strconv"
+	"strings"
 	"sync"
 	"time"
 
+	"github.com/joho/godotenv"
 	"github.com/labstack/echo/v4"
 	"github.com/labstack/echo/v4/middleware"
 	"github.com/labstack/gommon/log"
@@ -14,20 +21,41 @@ import (
 
 const TimeFormat = "2006-01-02 15:04:05"
 
-// the condition is: distance >= threshold
-var value uint16 = 0
-var valueMutex sync.Mutex
+var token string
 
-type ReadReq struct {
-	token string `body:"token"`
-}
+// the condition is: distance >= threshold (is door open)
+var opened bool
+
+// is door locked
+var locked bool = false
+
+// alert the user when door locked and but open?
+var alert bool = false
+var gotifyToken string
+var gotifyURL string
+
+var mut sync.Mutex
 
 type WriteReq struct {
-	value uint16 `body:"value"`
-	token string `body:"token"`
+	opened bool `body:"opened"`
 }
 
 func main() {
+	_ = godotenv.Load()
+	token = os.Getenv("TOKEN")
+
+	alertRaw := strings.ToLower(os.Getenv("USE_ALERTS"))
+	alert = alertRaw == "true" || alertRaw == "t" || alertRaw == "1" || alertRaw == "y" || alertRaw == "yes"
+
+	gotifyToken = os.Getenv("GOTIFY_TOKEN")
+	gotifyURL = os.Getenv("GOTIFY_URL")
+	if alert && gotifyToken == "" {
+		log.Fatal("GOTIFY_TOKEN can't be empty when alerts are enabled")
+	}
+	if alert && gotifyURL == "" {
+		log.Fatal("GOTIFY_URL can't be empty when alerts are enabled")
+	}
+
 	app := echo.New()
 	app.Logger.SetLevel(log.INFO)
 
@@ -76,29 +104,132 @@ func main() {
 		return c.JSON(http.StatusOK, "Hello, World!")
 	})
 
-	app.GET("/read", func(c echo.Context) error {
-		var data ReadReq
-		err := c.Bind(&data)
-		if err != nil {
-			return c.NoContent(http.StatusBadRequest)
-		}
+	app.GET("/read", authed(func(c echo.Context) error {
+		mut.Lock()
+		o := opened
+		mut.Unlock()
 
-		return c.JSON(http.StatusOK, echo.Map{"value": value})
-	})
+		return c.JSON(http.StatusOK, o)
+	}))
 
-	app.POST("/write", func(c echo.Context) error {
+	app.POST("/write", authed(func(c echo.Context) error {
 		var data WriteReq
 		err := c.Bind(&data)
 		if err != nil {
 			return c.NoContent(http.StatusBadRequest)
 		}
 
-		valueMutex.Lock()
-		value = data.value
-		valueMutex.Unlock()
+		mut.Lock()
+		if data.opened == opened {
+			mut.Unlock()
+			return c.NoContent(http.StatusOK)
+		}
+
+		opened = data.opened
+		if locked && alert {
+			var action string
+			if opened {
+				action = "opened"
+			} else {
+				action = "closed"
+			}
+
+			go sendAlert(action)
+		}
+
+		mut.Unlock()
+		return c.NoContent(http.StatusOK)
+	}))
+
+	app.POST("/lock", authed(func(c echo.Context) error {
+		mut.Lock()
+		locked = true
+		mut.Unlock()
 
 		return c.NoContent(http.StatusOK)
-	})
+	}))
+
+	app.POST("/unlock", authed(func(c echo.Context) error {
+		mut.Lock()
+		locked = false
+		mut.Unlock()
+
+		return c.NoContent(http.StatusOK)
+	}))
+
+	app.POST("/alerts/pause", authed(func(c echo.Context) error {
+		pauseForRaw := c.QueryParam("for")
+		if pauseForRaw != "" {
+			pauseFor, err := strconv.Atoi(pauseForRaw)
+			if err != nil || pauseFor <= 0 {
+				return c.JSON(http.StatusBadRequest, "query param 'for' not valid")
+			}
+
+			go func() {
+				time.Sleep(time.Duration(pauseFor) * time.Second)
+
+				mut.Lock()
+				alert = true
+				mut.Unlock()
+			}()
+		}
+
+		mut.Lock()
+		alert = false
+		mut.Unlock()
+
+		return c.NoContent(http.StatusOK)
+	}))
+
+	app.POST("/alerts/resume", authed(func(c echo.Context) error {
+		mut.Lock()
+		alert = false
+		mut.Unlock()
+
+		return c.NoContent(http.StatusOK)
+	}))
 
 	log.Fatal(app.Start(":1323"))
 }
+
+func authed(next echo.HandlerFunc) echo.HandlerFunc {
+	return func(c echo.Context) error {
+		if c.Request().Header.Get("Authorization") != token {
+			return c.NoContent(http.StatusUnauthorized)
+		}
+
+		return next(c)
+	}
+}
+
+func sendAlert(action string) {
+	to := fmt.Sprintf("%s/message?token=%s", gotifyURL, gotifyToken)
+	what := echo.Map{
+		"title":    fmt.Sprintf("Your door has been %s", action),
+		"priority": 1,
+		"message":  fmt.Sprintf("Your locked door has been %s at %s", action, time.Now().Format(TimeFormat)),
+	}
+	b, err := json.Marshal(&what)
+	if err != nil {
+		log.Error(err)
+		return
+	}
+
+	res, err := http.Post(to, "application/json", bytes.NewBuffer(b))
+	if err != nil {
+		log.Error(err)
+		return
+	}
+
+	body, err := io.ReadAll(res.Body)
+	if err != nil {
+		log.Error(err)
+		return
+	}
+
+	if res.StatusCode != 200 {
+		log.Errorf("sendAlert response status code is not 200: %d, body:\n%s", res.StatusCode, body)
+	} else {
+		log.Infof("sent alert (%s) to gotify", action)
+	}
+}