From bd30d461b05cc8b29f5a0818596ea640e2484487 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?nicole=20miko=C5=82ajczyk?= <git@mkljczk.pl>
Date: Wed, 28 Jan 2026 22:02:22 +0100
Subject: [PATCH] Add /api/v2/instance profile fields limits info used by
 Mastodon
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Signed-off-by: nicole mikołajczyk <git@mkljczk.pl>
---
 changelog.d/instance-profile-fields.add              |  1 +
 .../web/api_spec/operations/instance_operation.ex    | 12 ++++++++++++
 lib/pleroma/web/mastodon_api/views/instance_view.ex  |  9 +++++++++
 3 files changed, 22 insertions(+)
 create mode 100644 changelog.d/instance-profile-fields.add

diff --git a/changelog.d/instance-profile-fields.add b/changelog.d/instance-profile-fields.add
new file mode 100644
index 0000000000..712bd68d9c
--- /dev/null
+++ b/changelog.d/instance-profile-fields.add
@@ -0,0 +1 @@
+Add /api/v2/instance profile fields limits info used by Mastodon
diff --git a/lib/pleroma/web/api_spec/operations/instance_operation.ex b/lib/pleroma/web/api_spec/operations/instance_operation.ex
index d8b2901d3c..6be4ea9966 100644
--- a/lib/pleroma/web/api_spec/operations/instance_operation.ex
+++ b/lib/pleroma/web/api_spec/operations/instance_operation.ex
@@ -342,6 +342,18 @@ defmodule Pleroma.Web.ApiSpec.InstanceOperation do
                 max_pinned_statuses: %Schema{
                   type: :integer,
                   description: "The maximum number of pinned statuses for each account."
+                },
+                max_profile_fields: %Schema{
+                  type: :integer,
+                  description: "The maximum number of custom profile fields allowed to be set."
+                },
+                profile_field_name_limit: %Schema{
+                  type: :integer,
+                  description: "The maximum size of a profile field name, in characters."
+                },
+                profile_field_value_limit: %Schema{
+                  type: :integer,
+                  description: "The maximum size of a profile field value, in characters."
                 }
               }
             },
diff --git a/lib/pleroma/web/mastodon_api/views/instance_view.ex b/lib/pleroma/web/mastodon_api/views/instance_view.ex
index 0dc7a5fea2..d64ce4fb5b 100644
--- a/lib/pleroma/web/mastodon_api/views/instance_view.ex
+++ b/lib/pleroma/web/mastodon_api/views/instance_view.ex
@@ -303,6 +303,15 @@ defmodule Pleroma.Web.MastodonAPI.InstanceView do
   defp configuration2 do
     configuration()
     |> put_in([:accounts, :max_pinned_statuses], Config.get([:instance, :max_pinned_statuses], 0))
+    |> put_in([:accounts, :max_profile_fields], Config.get([:instance, :max_account_fields]))
+    |> put_in(
+      [:accounts, :profile_field_name_limit],
+      Config.get([:instance, :account_field_name_length])
+    )
+    |> put_in(
+      [:accounts, :profile_field_value_limit],
+      Config.get([:instance, :account_field_value_length])
+    )
     |> put_in([:statuses, :characters_reserved_per_url], 0)
     |> Map.merge(%{
       urls: %{