added categories handling

src/sales_backend.cr

@@ -1,6 +1,7 @@
 require "kemal"
 require "./sales_backend/http/user"
 require "./sales_backend/http/product"
+require "./sales_backend/http/category"
 
 get "/" do |context|
     context.response.content_type = "application/json"

src/sales_backend/category.cr

@@ -0,0 +1,12 @@
+require "json"
+require "uuid"
+require "uuid/json"
+require "./product"
+
+class Category
+    JSON.mapping(
+        name: String,
+        parent: {type: String, nilable: true},
+        products: Array(UUID)
+    )
+  end

src/sales_backend/http/category.cr

@@ -0,0 +1,35 @@
+require "kemal"
+require "../*"
+require "io"
+require "file"
+require "exception"
+require "uuid"
+require "uuid/json"
+require "../../config"
+
+
+get "/category/m/:id" do |context|
+    begin
+        ret = Category.from_json File.read Statics.data_path+"category/"+context.params.url["id"]
+    rescue ex
+        halt context, status_code: 403, response: ex.to_s
+    end
+    ret.to_json
+end
+
+get "/category/d/:id" do |context|
+    ret = Array(Product).new
+    begin
+        cat = Category.from_json File.read Statics.data_path+"category/"+context.params.url["id"]
+        cat.products.each do |product|
+            begin 
+                ret.push Product.from_json File.read Statics.data_path+"products/"+product.to_s
+            rescue
+                
+            end
+        end
+    rescue ex
+        halt context, status_code: 403, response: ex.to_s
+    end
+    ret.to_json
+end