enabled base62 randomizing of URL

Gemfile

@@ -3,4 +3,5 @@ source :gemcutter
 gem "rack"
 gem "sinatra"
 gem "sequel"
-gem "pg"
+gem "pg"
+gem "anybase"

config.ru

@@ -27,4 +27,5 @@ require 'sinatra'
 #$stderr.reopen(log)
 
 require 'main'
+
 run Sinatra::Application

lib/shortenurl.rb

@@ -1,4 +1,7 @@
+require 'anybase'
+
 class ShortenUrl < Sequel::Model
+	plugin :validation_helpers
 	unless table_exists?
 		set_schema do
 			primary_key :id
@@ -8,25 +11,47 @@ class ShortenUrl < Sequel::Model
 		end
 		create_table
 	end
+	
+	def validate
+		super
+		validates_presence [:url, :key]
+		validates_unique :url
+		validates_unique :key
+	end
 			
 	def short_url
-		"#{Shorten.base_url}#{Shorten.shortener.to_s(id)}"
+		"#{Shorten.base_url}#{self.key.to_s}"
 	end
 	
 	def self.create_url(link)
-		uri = URI::parse(link)
-		raise "Invalid URL" unless uri.kind_of? URI::HTTP or uri.kind_of? URI::HTTPS
+ 		uri = URI::parse(link)
+ 		raise "Invalid URL" unless uri.kind_of? URI::HTTP or uri.kind_of? URI::HTTPS
+
+# 		url = self.filter(:url => link).first
+# 		if !url
+# 			max_id = self.order(:id.desc).first
+# 			if !max_id
+# 				max_id = 0
+# 			else
+# 				max_id = max_id.id
+# 			end
+# 			url = self.new(:url => link)
+# 			url.save
+# 		end
 
 		url = self.filter(:url => link).first
-		if !url
-			max_id = self.order(:id.desc).first
-			if !max_id
-				max_id = 0
-			else
-				max_id = max_id.id
+		if !url 
+
+			key = Anybase::Base62.random(Shorten.path_size)
+			key_check = self.filter(:url => key).first
+			
+			while key_check
+				key = Anybase::Base62.random(Shorten.path_size)
+				key_check = self.filter(:url => key).first
 			end
-			url = self.new(:url => link)
-			url.save
+	
+			url = self.new(:url => link, :key => key)
+			url.save					
 		end
 		
 		url

main.rb

@@ -12,7 +12,8 @@ configure do
 	Shorten = OpenStruct.new(
 		:base_url => "http://xn--8gi.ws/",
 		:service_name => "➼.ws",
-		:button_text => "➼"
+		:button_text => "➼",
+		:path_size => 4
 	)
 	
 	$LOAD_PATH.unshift(File.dirname(__FILE__) + '/lib')
@@ -97,7 +98,7 @@ get %r(/(api-){0,1}create) do |api|
 	end
 end
 
-post '/new' do
+post '/' do
 	validate_link params[:url]
 
 	url = ShortenUrl.create_url(params[:url])