Make invite URL part of public API (#5424)

* Make invite URL public API

* Add doc and RPC

* Lint

* Update redbot/core/core_commands.py

Co-authored-by: Matt <psykzz@users.noreply.github.com>

* Update redbot/core/bot.py

Co-authored-by: jack1142 <6032823+jack1142@users.noreply.github.com>

* RPC handling,

* Fix appinfo

* Change docs

* Fix docs

* Change docs

* Update redbot/core/core_commands.py

Co-authored-by: jack1142 <6032823+jack1142@users.noreply.github.com>

* Docstring changes

* nit

Co-authored-by: Matt <psykzz@users.noreply.github.com>
Co-authored-by: jack1142 <6032823+jack1142@users.noreply.github.com>

redbot/core/bot.py

@@ -1273,6 +1273,37 @@ class Red(
         """
         return user.id in self.owner_ids
 
+    async def get_invite_url(self) -> str:
+        """
+        Generates the invite URL for the bot.
+
+        Does not check if the invite URL is configured to be public
+        with ``[p]inviteset public``. To check if invites are public,
+        use `Red.is_invite_url_public()`.
+
+        Returns
+        -------
+        str
+            Invite URL.
+        """
+        data = await self._config.all()
+        commands_scope = data["invite_commands_scope"]
+        scopes = ("bot", "applications.commands") if commands_scope else None
+        perms_int = data["invite_perm"]
+        permissions = discord.Permissions(perms_int)
+        return discord.utils.oauth_url(self._app_info.id, permissions, scopes=scopes)
+
+    async def is_invite_url_public(self) -> bool:
+        """
+        Determines if invite URL is configured to be public with ``[p]inviteset public``.
+
+        Returns
+        -------
+        bool
+            :code:`True` if the invite URL is public.
+        """
+        return await self._config.invite_public()
+
     async def is_admin(self, member: discord.Member) -> bool:
         """Checks if a member is an admin of their guild."""
         try:

redbot/core/core_commands.py

@@ -362,13 +362,7 @@ class CoreLogic:
         str
             Invite URL.
         """
-        app_info = await self.bot.application_info()
+        return await self.bot.get_invite_url()
-        data = await self.bot._config.all()
-        commands_scope = data["invite_commands_scope"]
-        scopes = ("bot", "applications.commands") if commands_scope else None
-        perms_int = data["invite_perm"]
-        permissions = discord.Permissions(perms_int)
-        return discord.utils.oauth_url(app_info.id, permissions, scopes=scopes)
 
     @staticmethod
     async def _can_get_invite_url(ctx):
@@ -1465,7 +1459,7 @@ class Core(commands.commands._RuleDropper, commands.Cog, CoreLogic):
             - `[p]invite`
         """
         try:
-            await ctx.author.send(await self._invite_url())
+            await ctx.author.send(await self.bot.get_invite_url())
             await ctx.tick()
         except discord.errors.Forbidden:
             await ctx.send(