Implement login resolver (#15)

* add sign_up_method to users table

* add session store

* implement login resolver

server/session/redisStore.go

@@ -0,0 +1,43 @@
+package session
+
+import (
+	"context"
+	"log"
+
+	"github.com/go-redis/redis/v8"
+)
+
+type RedisStore struct {
+	ctx   context.Context
+	store *redis.Client
+}
+
+func (c *RedisStore) AddToken(userId, token string) {
+	err := c.store.Set(c.ctx, "yauth_"+userId, token, 0).Err()
+	if err != nil {
+		log.Fatalln("Error saving redis token:", err)
+	}
+}
+
+func (c *RedisStore) DeleteToken(userId string) {
+	err := c.store.Del(c.ctx, "yauth_"+userId).Err()
+	if err != nil {
+		log.Fatalln("Error deleting redis token:", err)
+	}
+}
+
+func (c *RedisStore) ClearStore() {
+	err := c.store.Del(c.ctx, "yauth_*").Err()
+	if err != nil {
+		log.Fatalln("Error clearing redis store:", err)
+	}
+}
+
+func (c *RedisStore) GetToken(userId string) string {
+	token := ""
+	token, err := c.store.Get(c.ctx, "yauth_"+userId).Result()
+	if err != nil {
+		log.Println("Error getting token from redis store:", err)
+	}
+	return token
+}