From 74438a31458af8bddd08d90eacc6d63677bab844 Mon Sep 17 00:00:00 2001
From: Jonas Dellinger <jonas@dellinger.dev>
Date: Fri, 13 May 2022 19:14:47 +0200
Subject: Work on react frontend loader

---
 backend/injector.py | 95 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 backend/injector.py

(limited to 'backend/injector.py')

diff --git a/backend/injector.py b/backend/injector.py
new file mode 100644
index 00000000..16ced852
--- /dev/null
+++ b/backend/injector.py
@@ -0,0 +1,95 @@
+#Injector code from https://github.com/SteamDeckHomebrew/steamdeck-ui-inject. More info on how it works there.
+
+from asyncio import sleep
+from logging import debug, getLogger
+from traceback import format_exc
+
+from aiohttp import ClientSession
+
+BASE_ADDRESS = "http://localhost:8080"
+
+logger = getLogger("Injector")
+
+class Tab:
+    def __init__(self, res) -> None:
+        self.title = res["title"]
+        self.id = res["id"]
+        self.ws_url = res["webSocketDebuggerUrl"]
+
+        self.websocket = None
+        self.client = None
+
+    async def open_websocket(self):
+        self.client = ClientSession()
+        self.websocket = await self.client.ws_connect(self.ws_url)
+
+    async def listen_for_message(self):
+        async for message in self.websocket:
+            yield message
+
+    async def _send_devtools_cmd(self, dc, receive=True):
+        if self.websocket:
+            await self.websocket.send_json(dc)
+            return (await self.websocket.receive_json()) if receive else None
+        raise RuntimeError("Websocket not opened")
+
+    async def evaluate_js(self, js, run_async=False):
+        await self.open_websocket()
+        res = await self._send_devtools_cmd({
+            "id": 1,
+            "method": "Runtime.evaluate",
+            "params": {
+                "expression": js,
+                "userGesture": True,
+                "awaitPromise": run_async
+            }
+        })
+
+        await self.client.close()
+        return res
+
+    def __repr__(self):
+        return self.title
+
+async def get_tabs():
+    async with ClientSession() as web:
+        res = {}
+
+        while True:
+            try:
+                res = await web.get(f"{BASE_ADDRESS}/json")
+                break
+            except:
+                logger.debug("Steam isn't available yet. Wait for a moment...")
+                logger.debug(format_exc())
+                await sleep(5)
+
+        if res.status == 200:
+            r = await res.json()
+            return [Tab(i) for i in r]
+        else:
+            raise Exception(f"/json did not return 200. {await r.text()}")
+
+async def get_tab(tab_name):
+    tabs = await get_tabs()
+    tab = next((i for i in tabs if i.title == tab_name), None)
+    if not tab:
+        raise ValueError(f"Tab {tab_name} not found")
+    return tab
+
+async def inject_to_tab(tab_name, js, run_async=False):
+    tab = await get_tab(tab_name)
+
+    return await tab.evaluate_js(js, run_async)
+
+async def tab_has_global_var(tab_name, var_name):
+    try:
+        tab = await get_tab(tab_name)
+    except ValueError:
+        return False
+    res = await tab.evaluate_js(f"window['{var_name}'] !== null && window['{var_name}'] !== undefined", False)
+
+    if not "result" in res or not "result" in res["result"] or not "value" in res["result"]["result"]:
+        return False
+
+    return res["result"]["result"]["value"]
-- 
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