Add ngrok shared URL ingress support (#1944)

extensions/ngrok/README.md

@@ -0,0 +1,69 @@
+# Adding an ingress URL through the ngrok Agent SDK for Python
+
+[ngrok](https://ngrok.com) is a globally distributed reverse proxy commonly used for quickly getting a public URL to a
+service running inside a private network, such as on your local laptop. The ngrok agent is usually
+deployed inside a private network and is used to communicate with the ngrok cloud service.
+
+By default the authtoken in the NGROK_AUTHTOKEN environment variable will be used. Alternatively one may be specified in
+the `settings.json` file, see the Examples below. Retrieve your authtoken on the [Auth Token page of your ngrok dashboard](https://dashboard.ngrok.com/get-started/your-authtoken), signing up is free.
+
+# Documentation
+
+For a list of all available options, see [the configuration documentation](https://ngrok.com/docs/ngrok-agent/config/) or [the connect example](https://github.com/ngrok/ngrok-py/blob/main/examples/ngrok-connect-full.py).
+
+The ngrok Python SDK is [on github here](https://github.com/ngrok/ngrok-py). A quickstart guide and a full API reference are included in the [ngrok-py Python API documentation](https://ngrok.github.io/ngrok-py/).
+
+# Running
+
+To enable ngrok install the requirements and then add `--extension ngrok` to the command line options, for instance:
+
+```bash
+pip install -r extensions/ngrok/requirements.txt
+python server.py --extension ngrok
+```
+
+In the output you should then see something like this:
+
+```bash
+INFO:Loading the extension "ngrok"...
+INFO:Session created
+INFO:Created tunnel "9d9d0944dc75ff9d3aae653e5eb29fe9" with url "https://d83706cf7be7.ngrok.app"
+INFO:Tunnel "9d9d0944dc75ff9d3aae653e5eb29fe9" TCP forwarding to "localhost:7860"
+INFO:Ingress established at https://d83706cf7be7.ngrok.app
+```
+
+You can now access the webui via the url shown, in this case `https://d83706cf7be7.ngrok.app`. It is recommended to add some authentication to the ingress, see below.
+
+# Example Settings
+
+In `settings.json` add a `ngrok` key with a dictionary of options, for instance:
+
+To enable basic authentication:
+```json
+{
+    "ngrok": {
+        "basic_auth": "user:password"
+    }
+}
+```
+
+To enable OAUTH authentication:
+```json
+{
+    "ngrok": {
+        "oauth_provider": "google",
+        "oauth_allow_domains": "asdf.com",
+        "oauth_allow_emails": "asdf@asdf.com"
+    }
+}
+```
+
+To add an authtoken instead of using the NGROK_AUTHTOKEN environment variable:
+```json
+{
+    "ngrok": {
+        "authtoken": "<token>",
+        "authtoken_from_env":false
+    }
+}
+```

extensions/ngrok/requirements.txt

@@ -0,0 +1 @@
+ngrok==0.*

extensions/ngrok/script.py

@@ -0,0 +1,36 @@
+# Adds ngrok ingress, to use add `--extension ngrok` to the command line options
+#
+# Parameters can be customized in settings.json of webui, e.g.: 
+# {"ngrok": {"basic_auth":"user:password"} }
+# or 
+# {"ngrok": {"oauth_provider":"google", "oauth_allow_emails":["asdf@asdf.com"]} }
+#
+# See this example for full list of options: https://github.com/ngrok/ngrok-py/blob/main/examples/ngrok-connect-full.py
+# or the README.md in this directory.
+
+import logging
+from modules import shared
+
+# Pick up host/port command line arguments
+host = shared.args.listen_host if shared.args.listen_host and shared.args.listen else '127.0.0.1'
+port = shared.args.listen_port if shared.args.listen_port else '7860'
+
+# Default options
+options = {
+    'addr': f"{host}:{port}",
+    'authtoken_from_env': True,
+    'session_metadata': 'text-generation-webui',
+}
+
+def ui():
+    settings = shared.settings.get("ngrok")
+    if settings:
+        options.update(settings)
+
+    try:
+        import ngrok
+        tunnel = ngrok.connect(**options)
+        logging.info(f"Ingress established at: {tunnel.url()}")
+    except ModuleNotFoundError:
+        logging.error("===> ngrok library not found, please run `pip install -r extensions/ngrok/requirements.txt`")
+