// Given the payload section of a JWS
// signature, it base64url decodes and returns
// a map structure representing the payload
func TokenToBlock(token string, blockName string) (map[string]interface{}, error) {
var block = map[string]interface{}{}
var payload, err = util.GetJWSPayload(token)
if err != nil {
return block, err
}
blockJSON, err := crypto.FromBase64Raw(payload)
if err != nil {
return block, errors.New("invalid " + blockName + " token")
}
block, err = util.JSONToMap(blockJSON)
if err != nil {
return block, errors.New("malformed " + blockName + " block")
}
return block, nil
}
// Decode a base64 encoded stone token
func Decode(encStone string) (*Stone, error) {
var stone = Empty()
// decode encoded token to get the signatures
sigJSON, err := crypto.FromBase64Raw(encStone)
if err != nil {
return &Stone{}, errors.New("failed to decode token")
}
// convert json to map
stoneMap, err := util.JSONToMap(sigJSON)
if err != nil {
return &Stone{}, errors.New("failed to parse token")
}
// parse and load meta block
if util.IsStringValue(stoneMap["meta"]) && stoneMap["meta"].(string) != "" {
var token = stoneMap["meta"].(string)
block, err := TokenToBlock(token, "meta")
if err != nil {
return stone, err
}
stone.Meta = block
stone.Signatures["meta"] = token
}
// parse and load ownership block
if util.IsStringValue(stoneMap["ownership"]) && stoneMap["ownership"].(string) != "" {
var token = stoneMap["ownership"].(string)
block, err := TokenToBlock(token, "ownership")
if err != nil {
return stone, err
}
stone.Ownership = block
stone.Signatures["ownership"] = token
}
// parse and load ownership block
if util.IsStringValue(stoneMap["attributes"]) && stoneMap["attributes"].(string) != "" {
var token = stoneMap["attributes"].(string)
block, err := TokenToBlock(token, "attributes")
if err != nil {
return stone, err
}
stone.Attributes = block
stone.Signatures["attributes"] = token
}
// parse and load embeds block
if util.IsStringValue(stoneMap["embeds"]) && stoneMap["embeds"].(string) != "" {
var token = stoneMap["embeds"].(string)
block, err := TokenToBlock(token, "embeds")
if err != nil {
return stone, err
}
stone.Embeds = block
stone.Signatures["embeds"] = token
}
return stone, nil
}