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103 lines
3.0 KiB
103 lines
3.0 KiB
// Copyright 2017 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package accounts
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import (
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"encoding/json"
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"errors"
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"fmt"
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"strings"
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)
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// URL represents the canonical identification URL of a wallet or account.
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//
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// It is a simplified version of url.URL, with the important limitations (which
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// are considered features here) that it contains value-copyable components only,
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// as well as that it doesn't do any URL encoding/decoding of special characters.
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//
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// The former is important to allow an account to be copied without leaving live
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// references to the original version, whereas the latter is important to ensure
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// one single canonical form opposed to many allowed ones by the RFC 3986 spec.
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//
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// As such, these URLs should not be used outside of the scope of an Ethereum
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// wallet or account.
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type URL struct {
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Scheme string // Protocol scheme to identify a capable account backend
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Path string // Path for the backend to identify a unique entity
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}
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// parseURL converts a user supplied URL into the accounts specific structure.
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func parseURL(url string) (URL, error) {
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parts := strings.Split(url, "://")
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if len(parts) != 2 || parts[0] == "" {
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return URL{}, errors.New("protocol scheme missing")
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}
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return URL{
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Scheme: parts[0],
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Path: parts[1],
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}, nil
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}
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// String implements the stringer interface.
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func (u URL) String() string {
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if u.Scheme != "" {
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return fmt.Sprintf("%s://%s", u.Scheme, u.Path)
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}
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return u.Path
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}
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// TerminalString implements the log.TerminalStringer interface.
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func (u URL) TerminalString() string {
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url := u.String()
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if len(url) > 32 {
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return url[:31] + "…"
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}
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return url
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}
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// MarshalJSON implements the json.Marshaller interface.
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func (u URL) MarshalJSON() ([]byte, error) {
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return json.Marshal(u.String())
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}
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// UnmarshalJSON parses url.
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func (u *URL) UnmarshalJSON(input []byte) error {
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var textURL string
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err := json.Unmarshal(input, &textURL)
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if err != nil {
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return err
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}
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url, err := parseURL(textURL)
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if err != nil {
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return err
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}
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u.Scheme = url.Scheme
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u.Path = url.Path
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return nil
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}
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// Cmp compares x and y and returns:
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//
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// -1 if x < y
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// 0 if x == y
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// +1 if x > y
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func (u URL) Cmp(url URL) int {
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if u.Scheme == url.Scheme {
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return strings.Compare(u.Path, url.Path)
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}
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return strings.Compare(u.Scheme, url.Scheme)
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}
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