Source code can be found from: https://github.com/LINKIWI/modern-paste Below are the features as listed on github:

• Modern user interface with a consistent design language
• Syntax highlighting for all languages supported by CodeMirror
• Ability to set paste expiration dates
• Ability to password-protect pastes
• Full user account functionality
  • Associate new pastes with a user account
  • View, modify, or delete pastes posted with a user account
  • Directly query the Modern Paste API with the account's API key/authtoken
• Public archive of pastes, sorted reverse chronologically or by popularity
• RESTful API for externally creating, reading, and managing pastes
• Ability to enforce security restrictions: can configure that only authenticated users can post pastes (ideal for private, non-public-facing installations)
• Ability to encrypt the front-facing-display of paste IDs (e.g. so that /paste/1 might display as /paste/9~AEygplxfCPHW4eJctbjMnRi-rYnlYzizqToCmG3BY=)