// newValidConfig builds a new environConfig from the provided Config
// and returns it. This includes applying the provided defaults
// values, if any. The resulting config values are validated.
func newValidConfig(cfg *config.Config, defaults map[string]interface{}) (*environConfig, error) {
// Any auth credentials handling should happen first...
// Ensure that the provided config is valid.
if err := config.Validate(cfg, nil); err != nil {
return nil, errors.Trace(err)
}
// Apply the defaults and coerce/validate the custom config attrs.
fixedDefaults, unset := adjustDefaults(cfg, defaults)
cfg, err := cfg.Remove(unset)
if err != nil {
return nil, errors.Trace(err)
}
validated, err := cfg.ValidateUnknownAttrs(configFields, fixedDefaults)
if err != nil {
return nil, errors.Trace(err)
}
validCfg, err := cfg.Apply(validated)
if err != nil {
return nil, errors.Trace(err)
}
// Build the config.
ecfg := newConfig(validCfg)
// Update to defaults set via client config.
clientCfg, err := ecfg.clientConfig()
if err != nil {
return nil, errors.Trace(err)
}
ecfg, err = ecfg.updateForClientConfig(clientCfg)
if err != nil {
return nil, errors.Trace(err)
}
// Do final (more complex, provider-specific) validation.
if err := ecfg.validate(); err != nil {
return nil, errors.Trace(err)
}
return ecfg, nil
}