draw image after fetch

server/main.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"log"
 	"net/http"
+	"strconv"
 
 	"github.com/go-chi/chi/v5"
 )
@@ -22,6 +23,61 @@ func requestHandler(w http.ResponseWriter, r *http.Request) {
 	fmt.Fprintf(w, "Hello, %s!\n", name)
 }
 
+const (
+	EPD_7IN3F_BLACK  = 0x0
+	EPD_7IN3F_WHITE  = 0x1
+	EPD_7IN3F_GREEN  = 0x2
+	EPD_7IN3F_BLUE   = 0x3
+	EPD_7IN3F_RED    = 0x4
+	EPD_7IN3F_YELLOW = 0x5
+	EPD_7IN3F_ORANGE = 0x6
+)
+
+func getImage(w http.ResponseWriter, r *http.Request) {
+	colors := []byte{
+		EPD_7IN3F_BLACK, EPD_7IN3F_BLUE, EPD_7IN3F_GREEN, EPD_7IN3F_ORANGE,
+		EPD_7IN3F_RED, EPD_7IN3F_YELLOW, EPD_7IN3F_WHITE, EPD_7IN3F_WHITE,
+	}
+
+	var data []byte
+
+	for i := 0; i < 240; i++ {
+		for k := 0; k < 4; k++ {
+			for j := 0; j < 100; j++ {
+				data = append(data, (colors[k]<<4)|colors[k])
+			}
+		}
+	}
+
+	for i := 0; i < 240; i++ {
+		for k := 4; k < 8; k++ {
+			for j := 0; j < 100; j++ {
+				data = append(data, (colors[k]<<4)|colors[k])
+			}
+		}
+	}
+
+	// // Fill the array with byte K
+	// for i := 0; i < 800*480/2; i++ {
+	// 	data = append(data, (colors[0]<<4)|colors[6])
+	// }
+
+	w.Header().Set("Content-Length", strconv.Itoa(len(data)))
+
+	w.Write(data)
+}
+
+func basicAuth(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		username, password, ok := r.BasicAuth()
+		if !ok || username != "username" || password != "password" {
+			http.Error(w, "Unauthorized.", 401)
+			return
+		}
+		next.ServeHTTP(w, r)
+	})
+}
+
 func main() {
 	fmt.Println("Hello, Nix!")
 
@@ -33,6 +89,11 @@ func main() {
 	router.Get("/", requestHandler)
 	router.Get("/{name}", requestHandler)
 
+	router.Group(func(r chi.Router) {
+		// r.Use(basicAuth)
+		r.Get("/getImage", getImage)
+	})
+
 	// Start the HTTP server on port 8080 and log any errors
-	log.Fatal(http.ListenAndServe(":8080", router))
+	log.Fatal(http.ListenAndServe("0.0.0.0:8080", router))
 }