Validator for urls

[vikiival]

Context

Someone was able to mint NFT with the broken metadata and yet we are unable to parse them.

https://canary.kodadot.xyz/ahk/gallery/180-3691204538

Seems their metadata has wrong format?

"image": "ipfs://ipfs/ipfs://ipfs/QmbM7cNWybBCCxyzUBQxhJ25qJ4Ecv7fGDgbFtFnhaSvaT",

"mediaUri": "ipfs://ipfs/ipfs://ipfs/QmbM7cNWybBCCxyzUBQxhJ25qJ4Ecv7fGDgbFtFnhaSvaT",

https://image-beta.w.kodadot.xyz/ipfs/bafkreidpi55n4lhjsn45eg6jopsiwptenyqarl7pyfg2xa52erpt4qhvwe

Task

Write a simple validator that returns '' when the image and animation url content is not correct.

Valid cases:

1. https://
2. ipfs://ip[fn]s/
3. ipfs://
4. /ip[fn]s/

most of the stuff is handled by @kodadot/minipfs but happy to deduplicate the code into some other common package

REF

• Can't load Referendum drop - wrong metadata nft-gallery#7739