What does each configuration parameter means?

• DBUsername :
  • Username to connect to DEV/PROD Cluster.
• DBPassword :
  • Password to connect to DEV/PROD Cluster.
• ClusterAddress :
  • Address of the Mongo Dev/Prod cluster containing the DBs.
• DEV_PORT :
  • Specifies the port used by the server to host the application.
  • By default the application is hosted on port 3000.
• CLIENT_ID and CLIENT_SECRET:
  • To make the google authentication work, you have to use Oauth API from google console.
  • Make a new project in google console.
  • you will get a Client_ID and Client Secret from there.
• SESSION_SECRET
  • This is a string that is used by express session middleware used to sign and encrypt the session data before it is stored on the client side.
  • To run locally you can set it to anything you want.
• ImageUploadLimit
  • This specifies the max number of images you can upload per post, in an Announcements and in a Event.
  • by default it is set to 5.
• ImageSizeLimitInBytes
  • Default value is 1048576 Bytes which is 1MB.
  • This specifies the max size of any individual image while uploading per post, in an Announcement and in a Event.
• imgurClientID
  • Whenever we upload an image in a post of an event or an announcement, it is not stored on the server itself.
  • This is done because we have hosted the website on render,in which Application data isn’t persisted across deploys and restarts on free instances.
  • So instead of storing the image on the server itself, I used Igmur APIs to upload the images Anonymously to Igmur, and store the image access link in the Mongo database.
  • This way the uploaded data remains persistant even across deploys and restarts.
  • We don’t need imgurClientID to upload images Anonymously to Igmur, but we need this to delete them.
  • We need the imgurClientID in the Authorization header to delete the images (with their respective deleteHash) when a post is deleted -
  • Authorization': Client-ID ${clientId},
• imgurClientSecret
  • Currently this is not used, because I am doing Anonymous uploads to Imgur, hence the uploads are not associated to any account.
• TitleLength
  • Specifies the maximum number of characters allowed in POD title.
• DescriptionLength
  • Specifies the maximum number of characters allowed in Description of an Event post or an Announcement Post.
• Host
  • This specifies the url on which the website is hosted.
  • When running locally the value should be - http://localhost:3000
  • In Delpoyment the value is be - https://knuth-programming-hub-9p08.onrender.com
  • This is used by -
    • KeepAlive.js to ping to the URL every 10 minutes, to keep the server from spinning down.
    • Auth.js to redirect to the Host after sucessfull Google auth login.
• limitPerPage
  • This specifies the max number of posts per page in Events page, POD page and Announcements page.
• NodeMailerEmail
  • This specifies the official email which is used to send updates to subscribers.
  • For local testing you can set it to any of your devtesting emails.
• NodeMailerAppPassword
  • this is the app password (not email password), for the email used above.
• PingBotDuration
  • This specifies the duration (in ms) in which the KeepAlive.js script should ping itself to keep the server from Spinning down.
  • by default the value is - 600000 which is 10 minutes
• RatingLength
  • Max limit of characters allowed in problem rating.