Tool that converts CIDv0 to CIDv1

[flyingzumwalt]

This relates to the discussion of origin domains in #6

[flyingzumwalt]

If you're trying to get a CIDv0 and the node has a CIDv1 the node will not be happy.

[whyrusleeping]

The issue is that right now, requesting a protobuf object with cidv1 doesnt fetch an object from disk that was stored as a cidv0. I can add in a translation layer that checks cidV0 when certain formats of cidV1s are encountered.

Has there been progress on this?

[lidel]

Both js-ipfs >= v0.33.0 and go-ipfs >= v0.4.18 support ipfs cid subcommand :

# cidv0(b58) → cidv1(b32)
$ ipfs cid base32 QmbWqxBEKC3P8tqsKc98xmWNzrzDtRLMiMPL8wBuTGsMnR
bafybeigdyrzt5sfp7udm7hu76uh7y26nf3efuylqabf3oclgtqy55fbzdi

# cidv1(b58) → cidv1(b32)
$ ipfs cid base32 zb2rhk6GMPQF3hfzwXTaNYFLKomMeC6UXdUt6jZKPpeVirLtV
bafkreigh2akiscaildcqabsyg3dfr6chu3fgpregiymsck7e7aqa4s52zy

There is also a standalone js-cid-tool for converting, formatting and discovering properties of CIDs.

go-ipfs >= v0.4.18 ships with:

A hack to allow locally looking up blocks associated with a CIDv0 CID using the equivalent CIDv1 CID (or the reverse). This hack will eventually be replaced with a multihash indexed blockstore, which is agnostic to both the CID version and multicodec content type.
– Release Notes for go-ipfs v0.4.18

js-ipfs will be able to do the same in near future – tracked in ipfs/js-ipfs#1440