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92 lines
2.3 KiB
Go
92 lines
2.3 KiB
Go
package upnp
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import (
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"crypto/rand"
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"encoding/xml"
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"fmt"
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"io"
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"log"
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"net/url"
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"regexp"
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"time"
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)
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// TODO: Why use namespace prefixes in PropertySet et al? Because the spec
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// uses them, and I believe the Golang standard library XML spec implementers
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// incorrectly assume that you can get away with just xmlns="".
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// propertyset is the root element sent in an event callback.
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type PropertySet struct {
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XMLName struct{} `xml:"e:propertyset"`
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Properties []Property
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// This should be set to `"urn:schemas-upnp-org:event-1-0"`.
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Space string `xml:"xmlns:e,attr"`
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}
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// propertys provide namespacing to the contained variables.
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type Property struct {
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XMLName struct{} `xml:"e:property"`
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Variable Variable
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}
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// Represents an evented state variable that has sendEvents="yes" in its
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// service spec.
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type Variable struct {
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XMLName xml.Name
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Value string `xml:",chardata"`
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}
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type subscriber struct {
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sid string
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nextSeq uint32 // 0 for initial event, wraps from Uint32Max to 1.
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urls []*url.URL
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expiry time.Time
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}
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// Intended to eventually be an embeddable implementation for managing
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// eventing for a service. Not complete.
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type Eventing struct {
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subscribers map[string]*subscriber
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}
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func (me *Eventing) Subscribe(callback []*url.URL, timeoutSeconds int) (sid string, actualTimeout int, err error) {
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var uuid [16]byte
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io.ReadFull(rand.Reader, uuid[:])
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sid = FormatUUID(uuid[:])
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if _, ok := me.subscribers[sid]; ok {
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err = fmt.Errorf("already subscribed: %s", sid)
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return
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}
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ssr := &subscriber{
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sid: sid,
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urls: callback,
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expiry: time.Now().Add(time.Duration(timeoutSeconds) * time.Second),
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}
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if me.subscribers == nil {
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me.subscribers = make(map[string]*subscriber)
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}
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me.subscribers[sid] = ssr
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actualTimeout = int(ssr.expiry.Sub(time.Now()) / time.Second)
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return
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}
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func (me *Eventing) Unsubscribe(sid string) error {
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return nil
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}
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var callbackURLRegexp = regexp.MustCompile("<(.*?)>")
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// Parse the CALLBACK HTTP header in an event subscription request. See UPnP
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// Device Architecture 4.1.2.
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func ParseCallbackURLs(callback string) (ret []*url.URL) {
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for _, match := range callbackURLRegexp.FindAllStringSubmatch(callback, -1) {
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_url, err := url.Parse(match[1])
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if err != nil {
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log.Printf("bad callback url: %q", match[1])
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continue
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}
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ret = append(ret, _url)
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}
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return
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}
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