diff --git a/extensions/yearnstudio/one.js b/extensions/yearnstudio/one.js
new file mode 100644
index 0000000000..a367c63d70
--- /dev/null
+++ b/extensions/yearnstudio/one.js
@@ -0,0 +1,295 @@
+(function (Scratch) {
+  "use strict";
+  if (!Scratch.extensions.unsandboxed) {
+    throw new Error("You can not run in sandbox");
+  }
+  const SHANGCLOUD_ORIGIN = "https://api.yearnstudio.cn";
+  let client_id = "";
+  let client_id_verified = false;
+  let accessToken = "";
+  let refreshToken = "";
+  let uid = 0;
+  let nickname = "";
+  class ShangCloudExtension {
+    getInfo() {
+      return {
+        id: "shangcloud",
+        name: Scratch.translate("shangcloud.name"),
+        color1: "#4CAF50",
+        color2: "#388E3C",
+        blocks: [
+          {
+            opcode: "setClientID",
+            blockType: Scratch.BlockType.COMMAND,
+            text: Scratch.translate("shangcloud.setClientID"),
+            arguments: {
+              CLIENT_ID: { type: Scratch.ArgumentType.STRING, default: "" },
+            },
+          },
+          {
+            opcode: "verifyClientID",
+            blockType: Scratch.BlockType.BOOLEAN,
+            text: Scratch.translate("shangcloud.verifyClientID"),
+            arguments: {},
+          },
+          {
+            opcode: "tryLogin",
+            blockType: Scratch.BlockType.COMMAND,
+            text: Scratch.translate("shangcloud.tryLogin"),
+            arguments: {
+              CLIENT_ID: { type: Scratch.ArgumentType.STRING, default: "" },
+            },
+          },
+          {
+            opcode: "loginStatusBool",
+            blockType: Scratch.BlockType.BOOLEAN,
+            disableMonitor: true,
+            text: Scratch.translate("shangcloud.loginStatusBool"),
+          },
+          {
+            opcode: "isTokenValid",
+            blockType: Scratch.BlockType.BOOLEAN,
+            disableMonitor: true,
+            text: Scratch.translate("shangcloud.isTokenValid"),
+            arguments: {},
+          },
+          {
+            opcode: "refreshToken",
+            blockType: Scratch.BlockType.BOOLEAN,
+            disableMonitor: true,
+            text: Scratch.translate("shangcloud.refreshToken"),
+            arguments: {},
+          },
+
+          "---",
+
+          {
+            blockType: Scratch.BlockType.LABEL,
+            text: Scratch.translate("shangcloud.label.getUserInfo"),
+          },
+          {
+            opcode: "getUserInfo",
+            blockType: Scratch.BlockType.COMMAND,
+            text: Scratch.translate("shangcloud.getUserInfo"),
+            arguments: {
+              CLIENT_ID: { type: Scratch.ArgumentType.STRING, default: "" },
+            },
+          },
+          {
+            opcode: "userUid",
+            blockType: Scratch.BlockType.REPORTER,
+            text: Scratch.translate("shangcloud.userUid"),
+          },
+          {
+            opcode: "userNickname",
+            blockType: Scratch.BlockType.REPORTER,
+            text: Scratch.translate("shangcloud.userNickname"),
+          },
+
+          "---",
+
+          {
+            blockType: Scratch.BlockType.LABEL,
+            text: Scratch.translate("shangcloud.label.cloudOperation"),
+          },
+          {
+            opcode: "writeVar",
+            blockType: Scratch.BlockType.COMMAND,
+            text: Scratch.translate("shangcloud.writeVar"),
+            arguments: {
+              KEY: { type: Scratch.ArgumentType.STRING, default: "temp" },
+              VALUE: { type: Scratch.ArgumentType.STRING, default: "1" },
+            },
+          },
+          {
+            opcode: "getVar",
+            blockType: Scratch.BlockType.REPORTER,
+            text: Scratch.translate("shangcloud.getVar"),
+            arguments: {
+              KEY: { type: Scratch.ArgumentType.STRING, default: "temp" },
+            },
+          },
+          {
+            opcode: "delVar",
+            blockType: Scratch.BlockType.COMMAND,
+            text: Scratch.translate("shangcloud.delVar"),
+            arguments: {
+              KEY: { type: Scratch.ArgumentType.STRING, default: "temp" },
+            },
+          },
+        ],
+      };
+    }
+    loginStatusBool() {
+      return accessToken ? true : false;
+    }
+    userUid() {
+      return uid || "";
+    }
+    userNickname() {
+      return nickname || "";
+    }
+    async isTokenValid() {
+      if (!client_id_verified) {
+        return false;
+      }
+      if (!accessToken) return false;
+      try {
+        const res = await Scratch.fetch(SHANGCLOUD_ORIGIN + "/api/token/test", {
+          method: "POST",
+          headers: {
+            Authorization: "Bearer " + accessToken,
+          },
+        });
+        if (res.status === 200) {
+          const data = await res.json();
+          if (data.msg === "ok" || data.msg === "OK") {
+            return true;
+          }
+        }
+        return false;
+      } catch (error) {
+        return false;
+      }
+    }
+    async delVar(args) {
+      if (!accessToken) return;
+      const key = args.KEY;
+      await Scratch.fetch(SHANGCLOUD_ORIGIN + "/api/var/" + key, {
+        method: "DELETE",
+        headers: {
+          Authorization: "Bearer " + accessToken,
+        },
+      });
+    }
+    async getVar(args) {
+      if (!accessToken) return;
+      const key = args.KEY;
+      const res = await Scratch.fetch(SHANGCLOUD_ORIGIN + "/api/var/" + key, {
+        method: "GET",
+        headers: {
+          Authorization: "Bearer " + accessToken,
+        },
+      });
+      const data = await res.json();
+      if (data.msg === "success") {
+        return data.data.value;
+      }
+      return "";
+    }
+    async writeVar(args) {
+      if (!accessToken) return;
+      const key = args.KEY;
+      const value = args.VALUE;
+      const params = new URLSearchParams();
+      params.append("value", value);
+      await Scratch.fetch(SHANGCLOUD_ORIGIN + "/api/var/" + key, {
+        method: "PUT",
+        headers: {
+          "Content-Type": "application/x-www-form-urlencoded",
+          Authorization: "Bearer " + accessToken,
+        },
+        body: params,
+      });
+    }
+    async setClientID(args) {
+      let temp_client_id = args.CLIENT_ID;
+      if (Scratch.vm.runtime.scratchblocks) {
+        client_id = temp_client_id;
+        return true;
+      }
+      let params = new URLSearchParams();
+      params.append("client_id", temp_client_id);
+      const res = await Scratch.fetch(
+        SHANGCLOUD_ORIGIN + "/api/verify/client_id",
+        {
+          method: "POST",
+          headers: {
+            "Content-Type": "application/x-www-form-urlencoded",
+          },
+          body: params,
+          credentials: "include",
+        }
+      );
+      const data = await res.json();
+      if (data.code === 200) {
+        client_id_verified = true;
+        client_id = temp_client_id;
+        return true;
+      }
+      return false;
+    }
+    tryLogin() {
+      return new Promise((resolve) => {
+        if (!client_id) {
+          alert("请先填写应用ID");
+          return;
+        }
+        const loginWindow = Scratch.openWindow(
+          SHANGCLOUD_ORIGIN +
+            "/auth/window?ui=1&client_id=" +
+            encodeURIComponent(client_id) +
+            "&origin=" +
+            encodeURIComponent(location.origin) +
+            "&scope=user:basic%20var:io",
+          "loginWindow",
+          "width=600,height=400"
+        );
+        window.addEventListener("message", function (event) {
+          if (event.origin !== SHANGCLOUD_ORIGIN) {
+            return resolve(false);
+          }
+          if (event.data.type === "login-success") {
+            const { token } = event.data.payload;
+            let token_json = JSON.parse(token);
+            if (token_json) {
+              accessToken = token_json.access_token;
+            }
+            if (token_json.refresh_token) {
+              refreshToken = token_json.refresh_token;
+            }
+            loginWindow.close();
+            resolve(true);
+          }
+        });
+      });
+    }
+    async refreshToken() {
+      if (!refreshToken) return false;
+      let param = new URLSearchParams();
+      param.append("client_id", client_id);
+      param.append("refresh_token", refreshToken);
+      const res = await Scratch.fetch(SHANGCLOUD_ORIGIN + "/oauth/token", {
+        method: "POST",
+        headers: {
+          "Content-Type": "application/x-www-form-urlencoded",
+        },
+        body: param,
+        credentials: "include",
+      });
+      const data = await res.json();
+      if (data) {
+        accessToken = data.access_token;
+        refreshToken = data.refresh_token;
+        return true;
+      }
+      return false;
+    }
+    async getUserInfo() {
+      const res = await Scratch.fetch(SHANGCLOUD_ORIGIN + "/api/info/me", {
+        method: "POST",
+        credentials: "include",
+      });
+      const data = await res.json();
+      if (!data.data) {
+        return;
+      }
+      uid = data.data.uid;
+      nickname = data.data.nickname;
+    }
+    verifyClientID() {
+      return !!client_id;
+    }
+  }
+  Scratch.extensions.register(new ShangCloudExtension());
+})(Scratch);