Additional auction module commands (#3)

Reviewed-on: deep-stack/laconic2d#3
Co-authored-by: Prathamesh Musale <prathamesh.musale0@gmail.com>
Co-committed-by: Prathamesh Musale <prathamesh.musale0@gmail.com>

utils/json.go

@@ -0,0 +1,97 @@
+package utils
+
+import (
+	"bytes"
+	"errors"
+
+	canonicalJson "github.com/gibson042/canonicaljson-go"
+	"github.com/ipfs/go-cid"
+	"github.com/ipld/go-ipld-prime/codec/dagcbor"
+	"github.com/ipld/go-ipld-prime/codec/dagjson"
+	"github.com/ipld/go-ipld-prime/linking"
+	cidlink "github.com/ipld/go-ipld-prime/linking/cid"
+	"github.com/ipld/go-ipld-prime/multicodec"
+	basicnode "github.com/ipld/go-ipld-prime/node/basic"
+	"github.com/ipld/go-ipld-prime/storage/memstore"
+)
+
+var store = memstore.Store{}
+
+func init() {
+	multicodec.RegisterEncoder(0x71, dagcbor.Encode)
+	multicodec.RegisterDecoder(0x71, dagcbor.Decode)
+}
+
+// GenerateHash returns the hash of the canonicalized JSON input.
+func GenerateHash(json map[string]interface{}) (string, []byte, error) {
+	content, err := canonicalJson.Marshal(json)
+	if err != nil {
+		return "", nil, err
+	}
+
+	cidString, err := CIDFromJSONBytes(content)
+	if err != nil {
+		return "", nil, err
+	}
+
+	return cidString, content, nil
+}
+
+// GetAttributeAsString returns a map attribute as string, if possible.
+func GetAttributeAsString(obj map[string]interface{}, attr string) (string, error) {
+	if value, ok := obj[attr]; ok {
+		if valueStr, ok := value.(string); ok {
+			return valueStr, nil
+		}
+
+		return "", errors.New("attribute not of string type")
+	}
+
+	return "", errors.New("attribute not found")
+}
+
+// CIDFromJSONBytes returns CID (dagcbor) for json (as bytes).
+// This is combination of samples for unmarshalling and linking
+// see: https://pkg.go.dev/github.com/ipld/go-ipld-prime
+func CIDFromJSONBytes(content []byte) (string, error) {
+	if len(content) == 0 {
+		return "", nil
+	}
+
+	np := basicnode.Prototype.Any                       // Pick a stle for the in-memory data.
+	nb := np.NewBuilder()                               // Create a builder.
+	err := dagjson.Decode(nb, bytes.NewReader(content)) // Hand the builder to decoding -- decoding will fill it in!
+	if err != nil {
+		return "", err
+	}
+	n := nb.Build() // Call 'Build' to get the resulting Node.  (It's immutable!)
+
+	lsys := cidlink.DefaultLinkSystem()
+
+	// We want to store the serialized data somewhere.
+	// We'll use an in-memory store for this.  (It's a package scoped variable.)
+	// You can use any kind of storage system here;
+	// or if you need even more control, you could also write a function that conforms to the linking.BlockWriteOpener interface.
+	lsys.SetWriteStorage(&store)
+	// To create any links, first we need a LinkPrototype.
+	// This gathers together any parameters that might be needed when making a link.
+	// (For CIDs, the version, the codec, and the multihash type are all parameters we'll need.)
+	// Often, you can probably make this a constant for your whole application.
+	lp := cidlink.LinkPrototype{Prefix: cid.Prefix{ //nolint:golint
+		Version:  1,    // Usually '1'.
+		Codec:    0x71, // 0x71 means "dag-cbor" -- See the multicodecs table: https://github.com/multiformats/multicodec/
+		MhType:   0x12, // 0x12 means "sha2-256" -- See the multicodecs table: https://github.com/multiformats/multicodec/
+		MhLength: 32,   // sha2-256 hash has a 32-byte sum.
+	}}
+
+	// Now: time to apply the LinkSystem, and do the actual store operation!
+	lnk, err := lsys.Store(
+		linking.LinkContext{}, // The zero value is fine.  Configure it it you want cancellability or other features.
+		lp,                    // The LinkPrototype says what codec and hashing to use.
+		n,                     // And here's our data.
+	)
+	if err != nil {
+		return "", err
+	}
+	return lnk.String(), nil
+}

utils/mnemonic.go

@@ -0,0 +1,21 @@
+package utils
+
+import "github.com/cosmos/go-bip39"
+
+const (
+	mnemonicEntropySize = 256
+)
+
+func GenerateMnemonic() (string, error) {
+	entropySeed, err := bip39.NewEntropy(mnemonicEntropySize)
+	if err != nil {
+		return "", err
+	}
+
+	mnemonic, err := bip39.NewMnemonic(entropySeed)
+	if err != nil {
+		return "", err
+	}
+
+	return mnemonic, nil
+}