Add a sidebar warning when channel credentials are missing

modules/http/chan_.pike

@@ -124,11 +124,17 @@ __async__ mapping(string:mixed) find_channel(Protocols.HTTP.Server.Request req,
 		"backlink": "<a href=\"./\">StilleBot - " + channel->display_name + "</a>",
 		"menubutton": "<span id=togglesidebarbox><button type=button id=togglesidebar title=\"Show/hide sidebar\">Show/hide sidebar</button></span>",
 	]);
+	string navbar_warning = "";
 	if (mapping user = req->misc->session->?user) {
 		if (channel->user_badges[(int)user->id]->?_mod || is_localhost_mod(user->login, req->get_ip()))
 			req->misc->is_mod = 1;
 		else req->misc->chaninfo->save_or_login = "<i>You're logged in, but not a recognized mod. Before you can make changes, go to the channel and say something, so I can see your mod sword. Thanks!</i>";
 		req->misc->chaninfo->logout = "| <a href=\"/logout\" class=twitchlogout>Log out</a>";
+		if ((int)user->id == channel->userid) {
+			mapping tok = G->G->user_credentials[channel->userid] || ([]);
+			//The channel may be in a reduced functionality state due to missing permissions.
+			if (tok->missing) navbar_warning = "<li style='margin-top: 0.5em'><button class=twitchlogin scopes=\"" + tok->missing * " " + "\">Fix login</button></li>";
+		}
 	}
 	else req->misc->chaninfo->save_or_login = "[Mods, login to make changes](:.twitchlogin)";
 	mapping profile = channel->userid ? await(get_user_info(channel->userid))
@@ -141,9 +147,10 @@ __async__ mapping(string:mixed) find_channel(Protocols.HTTP.Server.Request req,
 			"link_override": "https://mustardmine.com/activate",
 		]);
 	req->misc->chaninfo->menunav = sprintf(
-		"<nav id=sidebar><ul>%{<li><a href=%q>%s</a></li>%}</ul>"
+		"<nav id=sidebar><ul>%{<li><a href=%q>%s</a></li>%}%s</ul>"
 		"<a href=%q target=_blank><img src=%q alt=\"Channel avatar\" title=%q></a></nav>",
 		req->misc->is_mod ? sidebar_modmenu : sidebar_nonmodmenu,
+		navbar_warning,
 		profile->link_override || "https://twitch.tv/" + profile->login,
 		profile->profile_image_url || "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAC0lEQVR42mNgAAIAAAUAAen63NgAAAAASUVORK5CYII=",
 		"Go to channel " + (profile->display_name || ""));