Add avatar-url with experimental use of Subset::Helper

META6.json

@@ -13,7 +13,8 @@
         "Cro::WebSocket",
         "Data::Dump",
         "Object::Delayed",
-        "URI::Encode"
+        "URI::Encode",
+        "Subset::Helper"
     ],
     "test-depends": [
         "Test::META"

lib/API/Discord/User.rakumod

@@ -1,6 +1,7 @@
 use Object::Delayed;
 use API::Discord::Object;
 use API::Discord::Endpoints;
+use Subset::Helper;
 
 unit class API::Discord::User does API::Discord::Object is export;
 
@@ -60,6 +61,22 @@ submethod TWEAK() {
     $!real-id //= $!id;
 }
 
+my %image-formats = JPEG => '.jpeg', PNG => '.png', WebP => '.webp', GIF => '.gif';
+subset ReallyInt of Numeric where subset-is { $_.Int == $_ };
+subset PowerOfTwo of Int where subset-is { log($_, 2) ~~ ReallyInt };
+subset ImageFormat of Str where subset-is %image-formats{*}:exists;
+
+method avatar-url(
+    PowerOfTwo :$desired-size where 16 <= * <= 4096,
+    ImageFormat :$format = 'PNG'
+) {
+    my $url = $.api.cdn-url ~ '/avatars/' ~ $.real-id ~ '/' ~ $.avatar-hash ~ %image-formats{$format};
+    if $desired-size {
+        $url ~= '?size=' ~ $desired-size
+    }
+    return $url;
+}
+
 method guilds returns Promise {
     if not $!guilds-promise {
         $!guilds-promise = start {