WIP Store avatars as ActiveStorage attachments

Also push to LDAP as jpegPhoto

app/models/user.rb

@@ -4,8 +4,8 @@ class User < ApplicationRecord
   include EmailValidatable
 
   attr_accessor :current_password
-  attr_accessor :avatar_new
   attr_accessor :display_name
+  attr_accessor :avatar_new
   attr_accessor :pgp_pubkey
 
   serialize :preferences, coder: UserPreferences
@@ -27,6 +27,12 @@ class User < ApplicationRecord
 
   has_many :accounts, through: :lndhub_user
 
+  #
+  # Attachments
+  #
+
+  has_one_attached :avatar
+
   #
   # Validations
   #
@@ -159,13 +165,30 @@ class User < ApplicationRecord
     @display_name ||= ldap_entry[:display_name]
   end
 
-  def avatar
-    @avatar ||= LdapManager::FetchAvatar.call(cn: cn)
+  def avatar_base64(size: :medium)
+    return nil unless avatar.attached?
+    variant = avatar_variant(size: size)
+    data = ActiveStorage::Blob.service.download(variant.key)
+    Base64.strict_encode64(data)
   end
 
-  def avatar_base64
-    return nil if avatar.nil?
-    @avatar_base64 ||= Base64.strict_encode64(avatar)
+  def avatar_filename
+    return nil unless avatar.attached?
+    data = ActiveStorage::Blob.service.download(avatar.key)
+    hash = Digest::SHA256.hexdigest(data)
+    ext = avatar.content_type == "image/png" ? "png" : "jpg"
+    "#{hash}.#{ext}"
+  end
+
+  def avatar_variant(size: :medium)
+    dimensions = case size
+                 when :large  then [400, 400]
+                 when :medium then [256, 256]
+                 when :small  then [64, 64]
+                 else [256, 256]
+                 end
+    format = avatar.content_type == "image/png" ? :png : :jpeg
+    avatar.variant(resize_to_fill: dimensions, format: format)
   end
 
   def nostr_pubkey
@@ -232,7 +255,7 @@ class User < ApplicationRecord
       return unless avatar_new.present?
 
       if avatar_new.size > 1.megabyte
-        errors.add(:avatar, "file size is too large")
+        errors.add(:avatar, "must be less than 1MB file size")
       end
 
       acceptable_types = ["image/jpeg", "image/png"]