Implement ota generation

Author: polldo

command/ota/generate.go

@@ -0,0 +1,51 @@
+package ota
+
+import (
+	"bytes"
+	"errors"
+	"io/ioutil"
+	"os"
+
+	inota "github.com/arduino/iot-cloud-cli/internal/ota"
+)
+
+var (
+	arduinoVendorID = "2341"
+	fqbnToPID       = map[string]string{
+		"arduino:samd:nano_33_iot":            "8057",
+		"arduino:samd:mkr1000":                "804E",
+		"arduino:samd:mkrgsm1400":             "8052",
+		"arduino:samd:mkrnb1500":              "8055",
+		"arduino:samd:mkrwifi1010":            "8054",
+		"arduino:mbed_nano:nanorp2040connect": "005E",
+		"arduino:mbed_portenta:envie_m7":      "025B",
+	}
+)
+
+// Generate takes a .bin file and generate a .ota file.
+func Generate(binFile, outFile string, fqbn string) error {
+	productID, ok := fqbnToPID[fqbn]
+	if !ok {
+		return errors.New("fqbn not valid")
+	}
+
+	data, err := ioutil.ReadFile(binFile)
+	if err != nil {
+		return err
+	}
+
+	var w bytes.Buffer
+	otaWriter := inota.NewWriter(&w, arduinoVendorID, productID)
+	_, err = otaWriter.Write(data)
+	if err != nil {
+		return err
+	}
+	otaWriter.Close()
+
+	err = ioutil.WriteFile(outFile, w.Bytes(), os.FileMode(0644))
+	if err != nil {
+		return err
+	}
+
+	return nil
+}