/
signature.go
82 lines (63 loc) · 1.83 KB
/
signature.go
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package routeservice
import (
"encoding/base64"
"encoding/json"
"errors"
"time"
"code.cloudfoundry.org/gorouter/common/secure"
)
type SignatureContents struct {
ForwardedUrl string `json:"forwarded_url"`
RequestedTime time.Time `json:"requested_time"`
}
type Metadata struct {
Nonce []byte `json:"nonce"`
}
func BuildSignatureAndMetadata(
crypto secure.Crypto,
signatureContents *SignatureContents,
) (string, string, error) {
signatureContentsJson, err := json.Marshal(&signatureContents)
if err != nil {
return "", "", err
}
signatureJsonEncrypted, nonce, err := crypto.Encrypt(signatureContentsJson)
if err != nil {
return "", "", err
}
metadata := Metadata{
Nonce: nonce,
}
metadataJson, err := json.Marshal(&metadata)
if err != nil {
return "", "", err
}
metadataHeader := base64.URLEncoding.EncodeToString(metadataJson)
signatureHeader := base64.URLEncoding.EncodeToString(signatureJsonEncrypted)
return signatureHeader, metadataHeader, nil
}
func SignatureContentsFromHeaders(signatureHeader, metadataHeader string, crypto secure.Crypto) (SignatureContents, error) {
metadata := Metadata{}
signatureContents := SignatureContents{}
if metadataHeader == "" {
return signatureContents, errors.New("No metadata found")
}
metadataDecoded, err := base64.URLEncoding.DecodeString(metadataHeader)
if err != nil {
return signatureContents, err
}
err = json.Unmarshal(metadataDecoded, &metadata)
if err != nil {
return signatureContents, err
}
signatureDecoded, err := base64.URLEncoding.DecodeString(signatureHeader)
if err != nil {
return signatureContents, err
}
signatureDecrypted, err := crypto.Decrypt(signatureDecoded, metadata.Nonce)
if err != nil {
return signatureContents, err
}
err = json.Unmarshal([]byte(signatureDecrypted), &signatureContents)
return signatureContents, err
}