Added !poker and auth entry point

internal/points/points.go

@@ -0,0 +1,84 @@
+package points
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+)
+
+const (
+	dataDir = "internal/storage"
+	pointsFile = "points.json"
+)
+
+var (
+	mu sync.Mutex
+	pts map[string]int
+)
+
+const DefaultPoints = 100000
+
+// init or load points from disk
+func LoadPoints() error {
+	mu.Lock()
+	defer mu.Unlock()
+	pts = make(map[string]int)
+	path := filepath.Join(dataDir, pointsFile)
+
+	data, err := ioutil.ReadFile(path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil
+		}
+		return err
+	}
+	return json.Unmarshal(data, &pts)
+}
+
+// save balances to disk
+func SavePoints() error {
+	mu.Lock()
+	data, err := json.MarshalIndent(pts, "", "  ")
+	mu.Unlock()
+	if err != nil {
+		return err
+	}
+	if err := os.MkdirAll(dataDir, 0755); err != nil {
+		return err
+	}
+	return ioutil.WriteFile(filepath.Join(dataDir, pointsFile), data, 0644)
+}
+
+// return point balance for user, init if needed
+func GetPoints(user string) int {
+	mu.Lock()
+	defer mu.Unlock()
+	key := strings.ToLower(user)
+	bal, ok := pts[key]
+	if !ok {
+		pts[key] = DefaultPoints
+		bal = DefaultPoints
+	}
+	return bal
+}
+
+// add points to user's bal, save & return new bal
+func AddPoints(user string, delta int) (int error) {
+	mu.Lock()
+	key := strings.ToLower(user)
+	bal, ok := pts[key]
+	if !ok {
+		bal = DefaultPoints
+	}
+	bal += delta
+	pts[key] = bal
+	mu.Unlock()
+
+	if err := SavePoints(); err != nil {
+		return bal, err
+	}
+	return bal, nil
+}