Python rewrite (#6)

* Initial commit. Untested

* various fixes

Core functionality confirmed working:
 - Iframe injection into steam client
 - Plugin fetching from the iframe
 - Plugin opening

* Added function to fetch resources from steam

* Improved injector module, added server-js communication

- Injector module now has methods for better lower-level manipulation of the tab debug websocket.
- Our "front-end" can now communicate with the manager (2-way), completely bypassing the chromium sandbox. This works via a dirty debug console trick, whoever wants to know how it works can take a look at the code.
- Added utility methods file, along with an implementation of the aiohttp client that our "front-end" can access, via the system described above.
- Added js implementations of the communication system described above, which can be imported by plugins.

* Added steam_resource endpoint

* Added basic installer script

* retry logic bug fix

* fixed library injection, event propagation, websocket handling

- library is injected directly into the plugins as well as the plugin list
- resolveMethodCall is implemented in the plugin_list.js file, which in turns calls window.sendMessage on the iframe to propagate the event
- websocket method calls are processed in their own tasks now, so as not to block on long-running calls.

Co-authored-by: tza <tza@hidden>
Co-authored-by: WerWolv <werwolv98@gmail.com>

plugin_loader/loader.py

@@ -0,0 +1,60 @@
+from aiohttp import web
+from aiohttp_jinja2 import template
+
+from os import path, listdir
+from importlib.util import spec_from_file_location, module_from_spec
+from logging import getLogger
+
+import injector
+
+class Loader:
+    def __init__(self, server_instance, plugin_path) -> None:
+        self.logger = getLogger("Loader")
+        self.plugin_path = plugin_path
+        self.plugins = self.import_plugins()
+
+        server_instance.add_routes([
+            web.get("/plugins/iframe", self.plugin_iframe_route),
+            web.get("/plugins/reload", self.reload_plugins),
+            web.post("/plugins/method_call", self.handle_plugin_method_call),
+            web.get("/plugins/load/{name}", self.load_plugin),
+            web.get("/steam_resource/{path:.+}", self.get_steam_resource)
+        ])
+
+    def import_plugins(self):
+        files = [i for i in listdir(self.plugin_path) if i.endswith(".py")]
+        dc = {}
+        for file in files:
+            try:
+                spec = spec_from_file_location("_", path.join(self.plugin_path, file))
+                module = module_from_spec(spec)
+                spec.loader.exec_module(module)
+                dc[module.Plugin.name] = module.Plugin
+                self.logger.info("Loaded {}".format(module.Plugin.name))
+            except Exception as e:
+                self.logger.error("Could not load {}. {}".format(file, e))
+        return dc
+
+    async def reload_plugins(self, request=None):
+        self.logger.info("Re-importing all plugins.")
+        self.plugins = self.import_plugins()
+
+    async def handle_plugin_method_call(self, plugin_name, method_name, **kwargs):
+        return await getattr(self.plugins[plugin_name], method_name)(**kwargs)
+
+    async def get_steam_resource(self, request):
+        tab = (await injector.get_tabs())[0]
+        return web.Response(text=await tab.get_steam_resource(f"https://steamloopback.host/{request.match_info['path']}"), content_type="text/html")
+
+    async def load_plugin(self, request):
+        plugin = self.plugins[request.match_info["name"]]
+        ret = """
+        <script src="/static/library.js"></script>
+        <script>const plugin_name = '{}' </script>
+        {}
+        """.format(plugin.name, plugin.main_view_html)
+        return web.Response(text=ret, content_type="text/html")
+
+    @template('plugin_view.html')
+    async def plugin_iframe_route(self, request):
+        return {"plugins": self.plugins.values()}