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deeplink.go
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deeplink.go
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// Package deeplink contains deeplink parsing helpers.
package deeplink
import (
"net/url"
"path"
"strings"
"golang.org/x/xerrors"
)
// Type is a enum type of Telegram deeplinks types.
type Type string
const (
// Resolve is deeplink like
//
// tg:resolve?domain={domain}
// tg://resolve?domain={domain}
// https://t.me/{domain}
// https://telegram.me/{domain}
//
Resolve Type = "resolve"
// Join is deeplink like
//
// tg:join?invite={hash}
// tg://join?invite={hash}
// https://t.me/joinchat/{hash}
// https://telegram.me/joinchat/{hash}
//
Join Type = "join"
)
// DeepLink represents Telegram deeplink.
type DeepLink struct {
Type Type
Args url.Values
}
func ensureParam(query url.Values, key string) error {
if query.Get(key) == "" {
return xerrors.Errorf("should have %q query parameter", key)
}
return nil
}
func (d DeepLink) validate() error {
switch d.Type {
case Resolve:
return ensureParam(d.Args, "domain")
case Join:
return ensureParam(d.Args, "invite")
default:
return xerrors.Errorf("unsupported deeplink %q", d.Type)
}
}
func parseTg(u *url.URL) (DeepLink, error) {
query := u.Query()
switch Type(u.Hostname()) {
case Resolve:
return DeepLink{
Type: Resolve,
Args: query,
}, nil
case Join:
return DeepLink{
Type: Join,
Args: query,
}, nil
}
return DeepLink{}, xerrors.Errorf("unsupported deeplink %q", u.String())
}
func parseHTTPS(u *url.URL) (DeepLink, error) {
query := u.Query()
root, base := path.Split(path.Clean(u.Path))
root = strings.TrimPrefix(root, "/")
root = strings.TrimSuffix(root, "/")
switch root {
case "":
if len(base) > 0 && base[0] == '+' {
query.Set("invite", base[1:])
return DeepLink{
Type: Join,
Args: query,
}, nil
}
query.Set("domain", base)
return DeepLink{
Type: Resolve,
Args: query,
}, nil
case "joinchat":
query.Set("invite", base)
return DeepLink{
Type: Join,
Args: query,
}, nil
}
return DeepLink{}, xerrors.Errorf("unsupported deeplink %q", u.String())
}
// IsDeeplinkLike returns true if string may be a valid deeplink.
func IsDeeplinkLike(link string) bool {
return strings.HasPrefix(link, "tg:") ||
strings.HasPrefix(link, "t.me") ||
strings.HasPrefix(link, "https://")
}
// Parse parses and returns deeplink.
func Parse(link string) (DeepLink, error) {
switch {
// Normalize case like t.me/gotd.
case strings.HasPrefix(link, "t.me"):
link = strings.TrimSuffix("https://"+link, "/")
// Normalize case like tg:resolve?domain=gotd.
case !strings.HasPrefix(link, "tg://") && strings.HasPrefix(link, "tg:"):
link = "tg://" + strings.TrimPrefix(link, "tg:")
}
u, err := url.Parse(link)
if err != nil {
return DeepLink{}, xerrors.Errorf("invalid URL %q: %w", link, err)
}
var d DeepLink
switch {
case u.Scheme == "https" && u.Hostname() == "t.me":
d, err = parseHTTPS(u)
case u.Scheme == "tg":
d, err = parseTg(u)
default:
return DeepLink{}, xerrors.Errorf("invalid deeplink %q", link)
}
if err != nil {
return DeepLink{}, err
}
if err := d.validate(); err != nil {
return DeepLink{}, err
}
return d, nil
}
// Expect parses deeplink and check type its type.
func Expect(link string, typ Type) (DeepLink, error) {
l, err := Parse(link)
if err != nil {
return l, err
}
if l.Type != typ {
return l, xerrors.Errorf("unexpected deeplink type %q", l.Type)
}
return l, nil
}