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