feat: redirect by slug

.env.development

@@ -1 +1,2 @@
-DATABASE_URL=./sqlite/db.sqlite
+DATABASE_URL=sqlite3://./sqlite/data.db
+APP_URL=http://localhost:3000

db/migrations/20240512225208_add_slug_index_to_links.sql

@@ -0,0 +1,7 @@
+-- +micrate Up
+-- SQL in section 'Up' is executed when this migration is applied
+CREATE INDEX IF NOT EXISTS index_links_slug ON links (slug);
+
+-- +micrate Down
+-- SQL in section 'Down' is executed when this migration is rolled back
+DROP INDEX IF EXISTS index_links_slug;

src/controllers/link.cr

@@ -6,10 +6,12 @@ module App::Controllers::Link
     include App::Lib
 
     def call(env)
-      params = env.params.json["link"].as(Hash)
+      json_params = env.params.json.to_h
+      url = json_params.has_key?("url") ? json_params["url"] : nil
+      raise App::BadRequestException.new(env) if !url #TODO: return url "required field" error message
 
       link = Link.new
-      link.url = params["url"].as_s
+      link.url = url.to_s
       link.slug = Random::Secure.urlsafe_base64(4)
 
       changeset = Database.insert(link)
@@ -19,7 +21,26 @@ module App::Controllers::Link
         raise App::UnprocessableEntityException.new(env, errors.to_json)
       end
 
-      App::Serializers::Link.new(link).to_json
+      response = {"data" => App::Serializers::Link.new(link) }
+      response.to_json
     end
   end
+
+  class Index < App::Lib::BaseController
+    include App::Models
+    include App::Lib
+
+    def call(env)
+      slug = env.params.url["slug"]
+
+      link = Database.get_by(Link, slug: slug)
+      raise App::NotFoundException.new(env) if !link
+
+      #TODO: update click_counter
+
+      env.redirect link.url!
+    end
+  end
+
+  #TODO: update, delete, list links
 end

src/lib/errors.cr

@@ -1,16 +1,9 @@
 require "kemal"
 
 module App
-  class UnauthorizedException < Kemal::Exceptions::CustomException
+  class BadRequestException < Kemal::Exceptions::CustomException
     def initialize(context)
-      context.response.status_code = 401
-      super(context)
-    end
-  end
-
-  class ForbiddenException < Kemal::Exceptions::CustomException
-    def initialize(context)
-      context.response.status_code = 403
+      context.response.status_code = 400
       super(context)
     end
   end

src/routes.cr

@@ -9,6 +9,10 @@ module App
     Controllers::Ping::Get.new.call(env)
   end
 
+  get "/:slug" do |env|
+    Controllers::Link::Index.new.call(env)
+  end
+
   post "/api/links" do |env|
     Controllers::Link::Create.new.call(env)
   end