use config file

Signed-off-by: Sola <[email protected]>

card.json

@@ -0,0 +1,4 @@
+{
+  "card_uid": "f28a0d00",
+  "card_id": "1UZV VIXZ OJFL 2U12 FEDY"
+}

main.go

@@ -5,27 +5,60 @@ import (
 	"github.com/tarm/serial"
 	"log"
 	"strings"
+	"io/ioutil"
+	"encoding/json"
+	"encoding/hex"
 )
 
-var cardUID = "\xf2\x8a\x0d\x00"
-var cardID = strings.Replace("1UZV VIXZ OJFL 2U12 FEDY", " ", "", -1)
-var cardIDPart1 = cardID[:16]
-var cardIDPart2 = cardID[16:20] + strings.Repeat("\x00", 12)
+type Config struct {
+	CardUID string `json:"card_uid"`
+	CardID  string `json:"card_id"`
+}
+
+func check(e error) {
+	if e != nil {
+		panic(e)
+	}
+}
+
+func readConfigFromFile() Config {
+	config := Config{}
+	data, err := ioutil.ReadFile("card.json")
+	check(err)
+	err = json.Unmarshal(data, &config)
+	check(err)
+	return config
+}
+
+func hexToString(hexStr string) string {
+	bytes, err := hex.DecodeString(hexStr)
+	check(err)
+	return string(bytes)
+}
+
+func makeResponseTable(config Config) map[string]string {
+
+	cardUID := hexToString(config.CardUID)
+	cardID := strings.Replace(config.CardID, " ", "", -1)
+	cardIDPart1 := cardID[:16]
+	cardIDPart2 := cardID[16:20] + strings.Repeat("\x00", 12)
+
+	return map[string]string{
+		// is there any card? -> NOPE!
+		"\x02\x00\x02\x31\x30\x03\x02": "\x02\x00\x03\x31\x30\x4e\x03",
+		// eject card -> OK!
+		"\x02\x00\x02\x32\x30\x03\x01": "\x02\x00\x03\x32\x30\x59\x03",
+		// find card -> We got one!
+		"\x02\x00\x02\x35\x30\x03\x06": "\x02\x00\x03\x35\x30\x59\x03",
+		// get UID -> return our UID!
+		"\x02\x00\x02\x35\x31\x03\x07": "\x02\x00\x07\x35\x31\x59" + cardUID + "\x03",
+		// auth key A at sector 0 (key = 37 21 53 6a 72 40) -> You got it!
+		"\x02\x00\x09\x35\x32\x00\x37\x21\x53\x6a\x72\x40\x03\x12": "\x02\x00\x04\x35\x32\x00\x59\x03",
+		// read sector 0 block 1 -> Our card ID
+		"\x02\x00\x04\x35\x33\x00\x01\x03\x02": "\x02\x00\x15\x35\x33\x00\x01\x59" + cardIDPart1 + "\x03",
+		"\x02\x00\x04\x35\x33\x00\x02\x03\x01": "\x02\x00\x15\x35\x33\x00\x02\x59" + cardIDPart2 + "\x03",
+	}
 
-var table = map[string]string{
-	// is there any card? -> NOPE!
-	"\x02\x00\x02\x31\x30\x03\x02": "\x02\x00\x03\x31\x30\x4e\x03",
-	// eject card -> OK!
-	"\x02\x00\x02\x32\x30\x03\x01": "\x02\x00\x03\x32\x30\x59\x03",
-	// find card -> We got one!
-	"\x02\x00\x02\x35\x30\x03\x06": "\x02\x00\x03\x35\x30\x59\x03",
-	// get UID -> return our UID!
-	"\x02\x00\x02\x35\x31\x03\x07": "\x02\x00\x07\x35\x31\x59" + cardUID + "\x03",
-	// auth key A at sector 0 (key = 37 21 53 6a 72 40) -> You got it!
-	"\x02\x00\x09\x35\x32\x00\x37\x21\x53\x6a\x72\x40\x03\x12": "\x02\x00\x04\x35\x32\x00\x59\x03",
-	// read sector 0 block 1 -> Our card ID
-	"\x02\x00\x04\x35\x33\x00\x01\x03\x02": "\x02\x00\x15\x35\x33\x00\x01\x59" + cardIDPart1 + "\x03",
-	"\x02\x00\x04\x35\x33\x00\x02\x03\x01": "\x02\x00\x15\x35\x33\x00\x02\x59" + cardIDPart2 + "\x03",
 }
 
 func calcBCC(data string) string {
@@ -37,11 +70,13 @@ func calcBCC(data string) string {
 }
 
 func main() {
+	config := readConfigFromFile()
+	table := makeResponseTable(config)
 	fmt.Printf("dmt-io-emulator is ready!\n")
-	fmt.Printf("card uid: %x\n", cardUID)
-	fmt.Printf("card id: %s\n", cardID)
-	config := &serial.Config{Name: "COM9", Baud: 9600}
-	port, err := serial.OpenPort(config)
+	fmt.Printf("Card UID: %s\n", config.CardUID)
+	fmt.Printf("Card ID: %s\n", config.CardID)
+	portConfig := &serial.Config{Name: "COM9", Baud: 9600}
+	port, err := serial.OpenPort(portConfig)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -72,7 +107,6 @@ func main() {
 			}
 			cmd = ""
 		}
-
 	}
 }