go-w3up

go get github.com/web3.storage/go-w3up
go get github.com/web3.storage/go-ucanto

package main
 
import (
  "ioutil"
 
  "github.com/web3-storage/go-ucanto/did"
  "github.com/web3-storage/go-ucanto/principal/ed25519/signer"
  "github.com/web3-storage/go-w3up/delegation"
)
 
// space that the client will interact with
space, _ := did.Parse("did:key:z6MkwDuRThQcyWjqNsK54yKAmzfsiH6BTkASyiucThMtHt1y")
 
// private key to sign UCAN invocations with
priv, _ := ioutil.ReadFile("path/to/private.key")
issuer, _ := signer.Parse(priv)
 
// UCAN proof(s) that the signer can perform tasks in this space (a delegation chain)
prfbytes, _ := ioutil.ReadFile("path/to/proof.ucan")
proof, _ := delegation.ExtractProof(b)

package main
 
import (
	"bytes"
	"fmt"
	"net/http"
 
	"github.com/ipfs/go-cid"
	cidlink "github.com/ipld/go-ipld-prime/linking/cid"
	"github.com/multiformats/go-multihash"
	"github.com/web3-storage/go-w3up/capability/storeadd"
	"github.com/web3-storage/go-w3up/client"
)
 
func main() {
  data, _ := ioutil.ReadFile("path/to/my.car")
 
  // generate the CID for the CAR
  mh, _ := multihash.Sum(data, multihash.SHA2_256, -1)
  link := cidlink.Link{Cid: cid.NewCidV1(0x0202, mh)}
 
  rcpt, _ := client.StoreAdd(
    issuer,
    space,
    &storeadd.Caveat{Link: link, Size: len(data)},
    client.WithProofs(proofs),
  )
 
  // "upload" means it needs to be uploaded, "done" means it is already done!
  if rcpt.Out().Ok().Status == "upload" {
    hr, _ := http.NewRequest("PUT", *rcpt.Out().Ok().Url, bytes.NewReader(data))
 
    hdr := map[string][]string{}
    for k, v := range rcpt.Out().Ok().Headers.Values {
      hdr[k] = []string{v}
    }
 
    hr.Header = hdr
    hr.ContentLength = len(data)
    httpClient := http.Client{}
    res, _ := httpClient.Do(hr)
    res.Body.Close()
  }
 
  fmt.Println(link.String())
}

rcpt, _ := client.UploadAdd(
  issuer,
  space,
  &uploadadd.Caveat{Root: root, Shards: shards},
  client.WithProofs(proofs),
)