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package openid
import (
"errors"
"net/url"
"strings"
)
func Normalize(id string) (string, error) {
id = strings.TrimSpace(id)
if len(id) == 0 {
return "", errors.New("No id provided")
}
// 7.2 from openID 2.0 spec.
//If the user's input starts with the "xri://" prefix, it MUST be
//stripped off, so that XRIs are used in the canonical form.
if strings.HasPrefix(id, "xri://") {
id = id[6:]
return id, errors.New("XRI identifiers not supported")
}
// If the first character of the resulting string is an XRI
// Global Context Symbol ("=", "@", "+", "$", "!") or "(", as
// defined in Section 2.2.1 of [XRI_Syntax_2.0], then the input
// SHOULD be treated as an XRI.
if b := id[0]; b == '=' || b == '@' || b == '+' || b == '$' || b == '!' || b == '(' {
return id, errors.New("XRI identifiers not supported")
}
// Otherwise, the input SHOULD be treated as an http URL; if it
// does not include a "http" or "https" scheme, the Identifier
// MUST be prefixed with the string "http://". If the URL
// contains a fragment part, it MUST be stripped off together
// with the fragment delimiter character "#". See Section 11.5.2 for
// more information.
if !strings.HasPrefix(id, "http://") && !strings.HasPrefix(id,
"https://") {
id = "http://" + id
}
if fragmentIndex := strings.Index(id, "#"); fragmentIndex != -1 {
id = id[0:fragmentIndex]
}
if u, err := url.ParseRequestURI(id); err != nil {
return "", err
} else {
if u.Host == "" {
return "", errors.New("Invalid address provided as id")
}
if u.Path == "" {
u.Path = "/"
}
id = u.String()
}
// URL Identifiers MUST then be further normalized by both
// following redirects when retrieving their content and finally
// applying the rules in Section 6 of [RFC3986] to the final
// destination URL. This final URL MUST be noted by the Relying
// Party as the Claimed Identifier and be used when requesting
// authentication.
return id, nil
}
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