AWSTemplateFormatVersion: '2010-09-09'
Description: 'Template for WAF Configuration'
Parameters:
  CamerasApi:
    Description: "Arn of the Cameras Api"
    Type: String
    Default: cameras-api-dev
  StageName:
    Description: "Stage name of the Cameras Api"
    Type: String
    Default: v
  Blocking:
    Description: "Number of calls per 5 minutes for WAF IP blocking."
    Type: Number
    Default: 2000
  EnvironmentType:
    Type: String
    Default: "dev"
    Description: "Type of environment: dev, staging or prod."


Resources:
  WAFCamerasWebACL:
    Type: AWS::WAFRegional::WebACL
    DependsOn: CamerasRateRule
    Properties:
      DefaultAction:
        Type: ALLOW
      MetricName: !Join ['', ['IPBlockingMetric', !Ref EnvironmentType]]
      Name: !Join ['', ['IPBlockingACL', !Ref EnvironmentType]]
      Rules:
        -
          Action:
            Type: "BLOCK"
          Priority: 1
          RuleId: !Ref CamerasRateRule

  CamerasRateRule:
    Type: AWS::WAFRegional::RateBasedRule
    Properties:
      MetricName: UnallowedAccessCount
      Name: FiveMinuteRule
      RateKey: IP
      RateLimit: !Ref Blocking
      MatchPredicates:
      -
        DataId: !Ref CamerasIpSet
        Negated: false
        Type: "IPMatch"

  CamerasIpSet:
    Type: AWS::WAFRegional::IPSet
    Properties:
      Name: !Join ['-', ['IpBlacklist', !Ref EnvironmentType]]


  MyWebACLAssociation:
    Type: AWS::WAFRegional::WebACLAssociation
    Properties:
      ResourceArn: !Sub arn:aws:apigateway:${AWS::Region}::/restapis/${CamerasApi}/stages/${StageName}
      WebACLId: !Ref WAFCamerasWebACL

Outputs:
  WebACL:
    Description: Name of the web ACL
    Value: !Ref WAFCamerasWebACL