New feature: ?import= allows importing BASE64-encoded Wallet JSON directly

[spirilis]

This is a new feature to enable the home page to check ?import= query string; contents should be a BASE64-encoded wallet JSON (e.g. base64 encoding a .webd downloaded wallet).

This allows us to stuff wallets into a https://webdollar.io/?import= URL, QR-code it, and have WebDollar Gift Cards!

Gift someone a webdollar account with preloaded balance!

[ibudisteanu]

Maybe we should sanitize the string as well before we import it.

[spirilis]

Agreed, apologies this was an amateur mistake on my part! I'm writing up some deep validation (validate base64, sanity-check JSON, double check JSON contents for valid keys, etc) now...

[spirilis]

Check out the latest commit. I tested it out with various malformed wallet JSON's and modification of the base64 and it seems to trigger correctly on various kinds of faults.

1. Valid base64 characters
2. JSON must start with {"version":
3. After parsing JSON, if version == "0.1", specific sanity checks of contents occur - validating only the specific keys exist, validating the hex bytestream of publicKey/privateKey, validating the address is correct length, begins with WEBD$ and ends with $

[ibudisteanu]

awesome work!