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83 lines
2.4 KiB
Go
83 lines
2.4 KiB
Go
package openid
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import (
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"encoding/xml"
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"errors"
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"strings"
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)
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// TODO: As per 11.2 in openid 2 specs, a service may have multiple
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// URIs. We don't care for discovery really, but we do care for
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// verification though.
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type XrdsIdentifier struct {
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Type []string `xml:"Type"`
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URI string `xml:"URI"`
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LocalID string `xml:"LocalID"`
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Priority int `xml:"priority,attr"`
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}
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type Xrd struct {
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Service []*XrdsIdentifier `xml:"Service"`
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}
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type XrdsDocument struct {
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XMLName xml.Name `xml:"XRDS"`
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Xrd *Xrd `xml:"XRD"`
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}
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func parseXrds(input []byte) (opEndpoint, opLocalID string, err error) {
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xrdsDoc := &XrdsDocument{}
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err = xml.Unmarshal(input, xrdsDoc)
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if err != nil {
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return
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}
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if xrdsDoc.Xrd == nil {
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return "", "", errors.New("XRDS document missing XRD tag")
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}
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// 7.3.2.2. Extracting Authentication Data
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// Once the Relying Party has obtained an XRDS document, it
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// MUST first search the document (following the rules
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// described in [XRI_Resolution_2.0]) for an OP Identifier
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// Element. If none is found, the RP will search for a Claimed
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// Identifier Element.
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for _, service := range xrdsDoc.Xrd.Service {
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// 7.3.2.1.1. OP Identifier Element
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// An OP Identifier Element is an <xrd:Service> element with the
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// following information:
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// An <xrd:Type> tag whose text content is
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// "http://specs.openid.net/auth/2.0/server".
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// An <xrd:URI> tag whose text content is the OP Endpoint URL
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if service.hasType("http://specs.openid.net/auth/2.0/server") {
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opEndpoint = strings.TrimSpace(service.URI)
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return
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}
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}
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for _, service := range xrdsDoc.Xrd.Service {
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// 7.3.2.1.2. Claimed Identifier Element
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// A Claimed Identifier Element is an <xrd:Service> element
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// with the following information:
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// An <xrd:Type> tag whose text content is
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// "http://specs.openid.net/auth/2.0/signon".
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// An <xrd:URI> tag whose text content is the OP Endpoint
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// URL.
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// An <xrd:LocalID> tag (optional) whose text content is the
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// OP-Local Identifier.
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if service.hasType("http://specs.openid.net/auth/2.0/signon") {
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opEndpoint = strings.TrimSpace(service.URI)
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opLocalID = strings.TrimSpace(service.LocalID)
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return
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}
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}
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return "", "", errors.New("Could not find a compatible service")
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}
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func (xrdsi *XrdsIdentifier) hasType(tpe string) bool {
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for _, t := range xrdsi.Type {
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if t == tpe {
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return true
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}
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}
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return false
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}
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