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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| package libp2pcarserver | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/base64" | ||
| "fmt" | ||
|
|
||
| "github.com/ipfs/go-cid" | ||
| "github.com/ipld/go-ipld-prime" | ||
| "github.com/ipld/go-ipld-prime/codec/dagcbor" | ||
| basicnode "github.com/ipld/go-ipld-prime/node/basic" | ||
| ) | ||
|
|
||
| // CARTransferRequest is the request sent by the client to transfer a CAR file | ||
| // for the given root and selector | ||
| type CARTransferRequest struct { | ||
| Root string // base64 encoded byte array | ||
| Selector string // base 64 encoded byte array | ||
| } | ||
|
|
||
| type dagTraversalRequest struct { | ||
| root cid.Cid | ||
| selector ipld.Node | ||
| } | ||
|
|
||
| func carRequestToDAGRequest(req *CARTransferRequest) (*dagTraversalRequest, error) { | ||
| rootbz, err := base64.StdEncoding.DecodeString(req.Root) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to decode root: %s", err) | ||
| } | ||
| rootcid, err := cid.Cast(rootbz) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to cast root to cid: %s", err) | ||
| } | ||
|
|
||
| selbz, err := base64.StdEncoding.DecodeString(req.Selector) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to decode selector: %s", err) | ||
| } | ||
| sel, err := decodeSelector(selbz) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to decode selector to ipld node: %s", err) | ||
| } | ||
|
|
||
| return &dagTraversalRequest{ | ||
| root: rootcid, | ||
| selector: sel, | ||
| }, nil | ||
| } | ||
|
|
||
| func decodeSelector(sel []byte) (ipld.Node, error) { | ||
| nb := basicnode.Prototype.Any.NewBuilder() | ||
| if err := dagcbor.Decode(nb, bytes.NewReader(sel)); err != nil { | ||
| return nil, err | ||
| } | ||
| return nb.Build(), nil | ||
| } |
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