{
  "AWSTemplateFormatVersion" : "2010-09-09",

  "Description" : "AWS CloudFormation Sample Template SampleRailsApp: This sample template shows how to use AWS CloudFormation with the Amazon Linux AMI Cloud-init feature to instantiate an application at runtime. The sample uses the WaitCondition resource to synchronize creation of the stack with the application becoming healthy. **WARNING** This template creates an Amazon EC2 instance and an Elastic IP Address. You will be billed for the AWS resources used if you create a stack from this template.",

  "Parameters" : {
    "KeyName": {
      "Description" : "Name of an existing EC2 KeyPair to enable SSH access to the instance",
      "Type": "String",
      "MinLength": "1",
      "MaxLength": "255",
      "AllowedPattern" : "[\\x20-\\x7E]*",
      "ConstraintDescription" : "can contain only ASCII characters."
    },
    "SSHLocation" : {
      "Description" : " The IP address range that can be used to SSH to the EC2 instances",
      "Type": "String",
      "MinLength": "9",
      "MaxLength": "18",
      "Default": "0.0.0.0/0",
      "AllowedPattern": "(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})/(\\d{1,2})",
      "ConstraintDescription": "must be a valid IP CIDR range of the form x.x.x.x/x."
    }  
  },

  "Mappings" : {
    "RegionMap" : {
      "us-east-1"      : { "AMI" : "ami-7f418316" },
      "us-west-1"      : { "AMI" : "ami-951945d0" },
      "us-west-2"      : { "AMI" : "ami-16fd7026" },
      "eu-west-1"      : { "AMI" : "ami-24506250" },
      "sa-east-1"      : { "AMI" : "ami-3e3be423" },
      "ap-southeast-1" : { "AMI" : "ami-74dda626" },
      "ap-southeast-2" : { "AMI" : "ami-b3990e89" },
      "ap-northeast-1" : { "AMI" : "ami-dcfa4edd" }
    }
  },

  "Resources" : {
    "Ec2Instance" : {
      "Type" : "AWS::EC2::Instance",
      "Properties" : {
        "KeyName" : { "Ref" : "KeyName" },
        "SecurityGroups" : [ { "Ref" : "InstanceSecurityGroup" } ],
        "ImageId" : { "Fn::FindInMap" : [ "RegionMap", { "Ref" : "AWS::Region" }, "AMI" ]},
        "UserData" : { "Fn::Base64" : { "Fn::Join" : ["",[
            "#!/bin/bash -ex","\n",
            "yum -y install gcc-c++ make","\n",
            "yum -y install mysql-devel sqlite-devel","\n",
            "yum -y install ruby18-rdoc rubygems ruby-mysql ruby-devel","\n",
            "gem install --no-ri --no-rdoc rails","\n",
            "gem install --no-ri --no-rdoc mysql","\n",
            "gem install --no-ri --no-rdoc sqlite3","\n",
            "rails new myapp","\n",
            "cd myapp","\n",
            "rails server -d","\n",
            "curl -X PUT -H 'Content-Type:' --data-binary '{\"Status\" : \"SUCCESS\",",
                                                           "\"Reason\" : \"The application myapp is ready\",",
                                                           "\"UniqueId\" : \"myapp\",",
                                                           "\"Data\" : \"Done\"}' ",
                  "\"", {"Ref" : "WaitForInstanceWaitHandle"},"\"\n" ]]}}
      }
    },

    "InstanceSecurityGroup" : {
      "Type" : "AWS::EC2::SecurityGroup",
      "Properties" : {
        "GroupDescription" : "Enable Access to Rails application via port 3000 and SSH access via port 22",
        "SecurityGroupIngress" : [ 
          {"IpProtocol" : "tcp", "FromPort" : "22", "ToPort" : "22", "CidrIp" : { "Ref" : "SSHLocation"}},
          {"IpProtocol" : "tcp", "FromPort" : "3000", "ToPort" : "3000", "CidrIp" : "0.0.0.0/0"}
        ]
      }
    },

    "WaitForInstanceWaitHandle" : {
      "Type" : "AWS::CloudFormation::WaitConditionHandle",
      "Properties" : {
      }
    },

    "WaitForInstance" : {
      "Type" : "AWS::CloudFormation::WaitCondition",
      "DependsOn" : "Ec2Instance",
      "Properties" : {
        "Handle" : {"Ref" : "WaitForInstanceWaitHandle"},
        "Timeout" : "600"
      }
    }
  },

  "Outputs" : {
    "WebsiteURL" : {
      "Description" : "The URL for the newly created Rails application",
      "Value" : { "Fn::Join" : ["", [ "http://", { "Fn::GetAtt" : [ "Ec2Instance", "PublicDnsName" ] }, ":3000" ]]}
    }
  }
}