53 lines
1.2 KiB
Go
53 lines
1.2 KiB
Go
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//
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// Copyright 2020 Wireline, Inc.
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//
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package utils
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import (
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"bytes"
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"errors"
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canonicalJson "github.com/gibson042/canonicaljson-go"
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cbor "github.com/ipfs/go-ipld-cbor"
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mh "github.com/multiformats/go-multihash"
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)
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// GenerateHash returns the hash of the canonicalized JSON input.
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func GenerateHash(json map[string]interface{}) (string, []byte, error) {
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content, err := canonicalJson.Marshal(json)
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if err != nil {
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return "", nil, err
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}
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cid, err := CIDFromJSONBytes(content)
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if err != nil {
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return "", nil, err
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}
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return cid, content, nil
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}
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// CIDFromJSONBytes returns CID (cbor) for json (as bytes).
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func CIDFromJSONBytes(content []byte) (string, error) {
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cid, err := cbor.FromJSON(bytes.NewReader(content), mh.SHA2_256, -1)
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if err != nil {
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return "", err
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}
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return cid.String(), nil
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}
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// GetAttributeAsString returns a map attribute as string, if possible.
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func GetAttributeAsString(obj map[string]interface{}, attr string) (string, error) {
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if value, ok := obj[attr]; ok {
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if valueStr, ok := value.(string); ok {
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return valueStr, nil
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}
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return "", errors.New("attribute not of string type")
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}
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return "", errors.New("attribute not found")
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}
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