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/static/library.js

@@ -0,0 +1,41 @@
+class PluginEventTarget extends EventTarget { }
+method_call_ev_target = new PluginEventTarget();
+
+window.addEventListener("message", function(evt) {
+    console.log(evt);
+    let ev = new Event(evt.data.call_id);
+    ev.data = evt.data.result;
+    method_call_ev_target.dispatchEvent(ev);
+}, false);
+
+async function call_server_method(method_name, arg_object={}) {
+    let id = `${new Date().getTime()}`;
+    console.debug(JSON.stringify({
+        "id": id,
+        "method": method_name,
+        "args": arg_object
+    }));
+    return new Promise((resolve, reject) => {
+        method_call_ev_target.addEventListener(`${id}`, function (event) {
+            if (event.data.success) resolve(event.data.result);
+            else reject(event.data.result);
+        });
+    });
+}
+
+async function fetch_nocors(url, request={}) {
+    let args = { method: "POST", headers: {}, body: "" };
+    request = {...args, ...request};
+    request.url = url;
+    return await call_server_method("http_request", request);
+}
+
+async function call_plugin_method(method_name, arg_object={}) {
+    if (plugin_name == undefined) 
+        throw new Error("Plugin methods can only be called from inside plugins (duh)");
+    return await call_server_method("plugin_method", {
+        'plugin_name': plugin_name,
+        'method_name': method_name,
+        'args': arg_object
+    });
+}

plugin_loader/static/plugin_page.js

@@ -0,0 +1,44 @@
+(function () {
+    const PLUGIN_ICON = `
+        <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-plugin" viewBox="0 0 16 16">
+          <path fill-rule="evenodd" d="M1 8a7 7 0 1 1 2.898 5.673c-.167-.121-.216-.406-.002-.62l1.8-1.8a3.5 3.5 0 0 0 
+              4.572-.328l1.414-1.415a.5.5 0 0 0 0-.707l-.707-.707 1.559-1.563a.5.5 0 1 0-.708-.706l-1.559 1.562-1.414-1.414
+              1.56-1.562a.5.5 0 1 0-.707-.706l-1.56 1.56-.707-.706a.5.5 0 0 0-.707 0L5.318 5.975a3.5 3.5 0 0 0-.328
+              4.571l-1.8 1.8c-.58.58-.62 1.6.121 2.137A8 8 0 1 0 0 8a.5.5 0 0 0 1 0Z"/>
+        </svg>
+    `;
+
+    function createTitle(text) {
+        return `<div id="plugin_title" class="quickaccessmenu_Title_34nl5">${text}</div>`;
+    }
+
+    function createPluginList() {
+        let pages = document.getElementsByClassName("quickaccessmenu_AllTabContents_2yKG4 quickaccessmenu_Down_3rR0o")[0];
+        let pluginPage = pages.children[pages.children.length - 1];
+        pluginPage.innerHTML = createTitle("Plugins");
+
+        pluginPage.innerHTML += `<iframe id="plugin_iframe" style="border: none; width: 100%; height: 100%;" src="http://127.0.0.1:1337/plugins/iframe"></iframe>`;
+    }
+
+    function inject() {
+        let tabs = document.getElementsByClassName("quickaccessmenu_TabContentColumn_2z5NL Panel Focusable")[0];
+        tabs.children[tabs.children.length - 1].innerHTML = PLUGIN_ICON;
+
+        createPluginList();
+    }
+
+    let injector = setInterval(function () {
+        if (document.hasFocus()) {
+            inject();
+            document.getElementById("plugin_title").onclick = function() {
+                document.getElementById("plugin_iframe").contentWindow.location.href = "http://127.0.0.1:1337/plugins/iframe";
+            }
+            clearInterval(injector);
+        }
+    }, 100);
+})();
+
+function resolveMethodCall(call_id, result) {
+    let iframe = document.getElementById("plugin_iframe").contentWindow;
+    iframe.postMessage({'call_id': call_id, 'result': result}, "http://127.0.0.1:1337");
+}