template.yaml

AWSTemplateFormatVersion: "2010-09-09"
Transform: AWS::Serverless-2016-10-31
Description: AWS SAM Template for a Lambda function triggered by cron and interacting with S3.

Parameters:
  AppDataJsonPath:
    Type: String
    Description: "Path to the app data JSON file in the S3 bucket"
  LeetbotSlackChannel:
    Type: String
    Description: "Slack channel for the Leetbot app"
  LeetbotSlackToken:
    Type: String
    Description: "Slack token for the Leetbot app"
  LeetbotSlackAlertsEnabled:
    Type: String
    Description: "Slack channel for Leetbot alerts"
  LeetbotQuestionDifficulty:
    Type: String
    Description: "Difficulty level of Leetbot questions, any combination of easy, medium, hard."

Resources:
  LeetbotLambda:
    Type: AWS::Serverless::Function
    Properties:
      Handler: leetbot.handler
      Runtime: python3.12
      CodeUri: ./leetbot/
      Timeout: 120
      MemorySize: 128
      ReservedConcurrentExecutions: 1
      Environment:
        Variables:
          LEETBOT_CHANNEL: !Ref LeetbotSlackChannel
          LEETBOT_JSON_PATH: !Sub "s3://${LeetbotBucket}/${AppDataJsonPath}"
          LEETBOT_QUESTION_DIFFICULTY: !Ref LeetbotQuestionDifficulty
          LEETBOT_SEND_CHANNEL_ALERT: !Ref LeetbotSlackAlertsEnabled
          LEETBOT_SLACK_TOKEN: !Ref LeetbotSlackToken
      Policies:
        - S3ReadPolicy:
            BucketName: !Ref LeetbotBucket
        - S3WritePolicy:
            BucketName: !Ref LeetbotBucket
      Events:
        LeetbotCron:
          Type: ScheduleV2
          Properties:
            Description: "Leetbot cron job"
            RetryPolicy:
              MaximumRetryAttempts: 0
              MaximumEventAgeInSeconds: 60
            ScheduleExpressionTimezone: UTC
            ScheduleExpression: cron(0 17 * * ? *) # Every day at noon PT (adjusted to UTC)

  LeetbotBucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: "leetbot-bucket"

Outputs:
  LambdaFunctionArn:
    Description: "ARN of the Lambda function"
    Value: !GetAtt LeetbotLambda.Arn

  S3BucketName:
    Description: "Name of the S3 bucket"
    Value: !Ref LeetbotBucket