package conf import ( "encoding/json" "fmt" "regexp" "strings" ) var reCredential = regexp.MustCompile(`^[a-zA-Z0-9!\$\(\)\*\+\.;<=>\[\]\^_\-\{\}@#&]+$`) const credentialSupportedChars = "A-Z,0-9,!,$,(,),*,+,.,;,<,=,>,[,],^,_,-,\",\",@,#,&" // Credential is a parameter that is used as username or password. type Credential string // MarshalJSON implements json.Marshaler. func (d Credential) MarshalJSON() ([]byte, error) { return json.Marshal(string(d)) } // UnmarshalJSON implements json.Unmarshaler. func (d *Credential) UnmarshalJSON(b []byte) error { var in string if err := json.Unmarshal(b, &in); err != nil { return err } if in != "" && !strings.HasPrefix(in, "sha256:") && !reCredential.MatchString(in) { return fmt.Errorf("credential contains unsupported characters. Supported are: %s", credentialSupportedChars) } *d = Credential(in) return nil } // UnmarshalEnv implements envUnmarshaler. func (d *Credential) UnmarshalEnv(s string) error { return d.UnmarshalJSON([]byte(`"` + s + `"`)) }