/
didprovider.go
86 lines (67 loc) · 1.88 KB
/
didprovider.go
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package didcomauth
import (
"crypto/rsa"
"crypto/x509"
"encoding/json"
"encoding/pem"
"errors"
"fmt"
"net/http"
"strings"
idKeeper "github.com/commercionetwork/commercionetwork/x/id/keeper"
)
const (
comDDOResolutionPath = "%s/identities/%s"
)
type ddoResolveResponse struct {
Result idKeeper.ResolveIdentityResponse `json:"result"`
}
func (drr ddoResolveResponse) SigningPubKey() (*rsa.PublicKey, error) {
rawKeyStr := ""
for _, k := range drr.Result.DidDocument.PubKeys {
if strings.HasSuffix(k.ID, "#keys-2") {
rawKeyStr = k.PublicKeyPem
}
}
if rawKeyStr == "" {
return nil, errors.New("DDO doesn't have a verification key")
}
block, _ := pem.Decode([]byte(rawKeyStr))
rawKey, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
return nil, err
}
key, ok := rawKey.(*rsa.PublicKey)
if !ok {
return nil, errors.New("selected key is not an rsa public key")
}
return key, nil
}
func ddoURL(lcd string, did string) string {
return fmt.Sprintf(comDDOResolutionPath, lcd, did)
}
// resolveDDO resolves the DDO for did by querying lcd.
func resolveDDO(lcd string, did string) (ddoResolveResponse, error) {
u := ddoURL(lcd, did)
data, err := http.Get(u)
if err != nil {
return ddoResolveResponse{}, fmt.Errorf("could not resolve DDO, %w", err)
}
if data.StatusCode == http.StatusNotFound {
return ddoResolveResponse{}, fmt.Errorf("ddo for %s not found", did)
}
if data.StatusCode != http.StatusOK {
return ddoResolveResponse{}, fmt.Errorf("LCD node responded with status %d", data.StatusCode)
}
var drr ddoResolveResponse
jdec := json.NewDecoder(data.Body)
err = jdec.Decode(&drr)
if err != nil {
return ddoResolveResponse{}, fmt.Errorf("could not unmarshal DDO, %w", err)
}
if drr.Result.DidDocument == nil {
return ddoResolveResponse{}, errors.New("ddo resolution okay but document is empty")
}
_ = data.Body.Close()
return drr, nil
}