add avatars

util.lua

@@ -0,0 +1,45 @@
+local util = {}
+local magick = require("magick")
+
+local Avatars = require("models").Avatars
+
+function util.get_user_avatar_url(req, user)
+  if not user.avatar_id then
+    return "/avatars/default.webp"
+  end
+  return Avatars:find(user.avatar_id).file_path
+end
+
+function util.validate_and_create_image(input_image, filename)
+  local img = magick.load_image_from_blob(input_image)
+
+  if not img then
+    return false
+  end
+
+  img:strip()
+  img:set_gravity("CenterGravity")
+
+  local width, height = img:get_width(), img:get_height()
+  local min_dim = math.min(width, height)
+  if min_dim > 256 then
+    local ratio = 256.0 / min_dim
+    local new_w, new_h = width * ratio, height * ratio
+    img:resize(new_w, new_h)
+  end
+
+  width, height = img:get_width(), img:get_height()
+  local crop_size = math.min(width, height)
+  local x_offset = (width - crop_size) / 2
+  local y_offset = (height - crop_size) / 2
+  img:crop(crop_size, crop_size, x_offset, y_offset)
+
+  img:set_format("webp")
+  img:set_quality(85)
+
+  img:write(filename)
+  img:destroy()
+  return true
+end
+
+return util