Add reddit app auth #529

Co-authored-by: s0ders <39492740+s0ders@users.noreply.github.com>

docs/configuration.md

@@ -843,7 +843,10 @@ Display a list of posts from a specific subreddit.
 
 > [!WARNING]
 >
-> Reddit does not allow unauthorized API access from VPS IPs, if you're hosting Glance on a VPS you will get a 403 response. As a workaround you can route the traffic from Glance through a VPN or your own HTTP proxy using the `request-url-template` property.
+> Reddit does not allow unauthorized API access from VPS IPs, if you're hosting Glance on a VPS you will get a 403
+> response. As a workaround you can either [register an app on Reddit](https://ssl.reddit.com/prefs/apps/) and use the
+> generated ID and secret in the widget configuration to authenticate your requests (see `app-auth` property), use a proxy
+> (see `proxy` property) or route the traffic from Glance through a VPN.
 
 Example:
 
@@ -868,6 +871,7 @@ Example:
 | top-period | string | no | day |
 | search | string | no | |
 | extra-sort-by | string | no | |
+| app-auth | object | no | |
 
 ##### `subreddit`
 The subreddit for which to fetch the posts from.
@@ -975,6 +979,17 @@ Can be used to specify an additional sort which will be applied on top of the al
 
 The `engagement` sort tries to place the posts with the most points and comments on top, also prioritizing recent over old posts.
 
+##### `app-auth`
+```yaml
+widgets:
+  - type: reddit
+    subreddit: technology
+    app-auth:
+      name: ${REDDIT_APP_NAME}
+      id: ${REDDIT_APP_CLIENT_ID}
+      secret: ${REDDIT_APP_SECRET}
+```
+
 ### Search Widget
 Display a search bar that can be used to search for specific terms on various search engines.