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notification.go
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notification.go
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package main
import (
"exp/html"
"exp/html/atom"
"fmt"
"math/rand"
"net/http"
"net/smtp"
"strconv"
"strings"
"time"
)
func newCommentNotify(comm *Comment) {
// notify the article author
if father := getArticle(comm.Father); father.Notif {
if father.Author != comm.Author {
send(father.Email, "Your article has been commented", fmt.Sprintf(
`Dear %s, your article on %s has been commented by %s:
<blockquote>%s</blockquote>
Click <a href="%s">here</a> for details. Click <a href="%s">here</a> to close the notification.`, father.Author, config["ServerName"], comm.Author, comm.Content, "http://"+config["Domain"]+config["ArticleUrl"]+fmt.Sprint(father.Id)+"#comment-"+fmt.Sprint(comm.Id), notifRegister(getCloseArticleNotif(comm.Father))))
}
}
// notify the commenter
for _, id := range parseRef(comm.Content) {
if p := getComment(id); p != nil && p.Notif {
if comm.Father == p.Father && comm.Author != p.Author {
send(p.Email, "Your comment has been quoted", fmt.Sprintf(
`Dear %s, your comment on %s has been quoted by %s:
<blockquote>%s</blockquote>
Click <a href="%s">here</a> for details. Click <a href="%s">here</a> to close the notification.
`, p.Author, config["ServerName"], comm.Author, comm.Content, "http://"+config["Domain"]+config["ArticleUrl"]+fmt.Sprint(p.Father)+"#comment-"+fmt.Sprint(comm.Id), notifRegister(getCloseCommentNotif(id))))
}
}
}
}
func getCloseArticleNotif(id aid) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
article := getArticle(id)
article.Notif = false
setArticle(article)
w.Write([]byte(`Successfully closed`))
}
}
func getCloseCommentNotif(id cid) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
comment := getComment(id)
comment.Notif = false
setComment(comment)
w.Write([]byte(`Successfully closed`))
}
}
func notifRegister(callback http.HandlerFunc) string {
var key string
for {
key = fmt.Sprint(rand.Uint32())
if _, ex := responseCallback[key]; !ex {
break
}
}
responseCallback[key] = callback
cbCleanChan <- cleanReq{key, time.Now().Add(time.Hour * 24)}
return "http://" + config["Domain"] + config["ResponseUrl"] + fmt.Sprint(key)
}
func mailResponseHandler(w http.ResponseWriter, r *http.Request) {
key := r.URL.Path[len(config["ResponseUrl"]):]
callback, ex := responseCallback[key]
if ex {
callback(w, r)
delete(responseCallback, key)
} else {
w.Write([]byte(`Invalid request`))
}
}
type cleanReq struct {
key string
expire time.Time
}
var mailAuth smtp.Auth
var responseCallback = map[string]http.HandlerFunc{}
var cbCleanChan = make(chan cleanReq, 1024)
func initNotification() {
if _, ok := config["SMTPUsername"]; !ok {
config["SMTPUsername"] = ""
}
if _, ok := config["SMTPPass"]; !ok {
config["SMTPPass"] = ""
}
if _, ok := config["SMTPAddr"]; !ok {
config["SMTPAddr"] = "127.0.0.1:25"
}
mailAuth = smtp.PlainAuth("", config["SMTPUsername"], config["SMTPPass"], config["SMTPAddr"])
rand.Seed(time.Now().Unix())
config["ResponseUrl"] = config["RootUrl"] + "response/"
http.HandleFunc(config["ResponseUrl"], mailResponseHandler)
// cleaner
go func() {
for {
req := <-cbCleanChan
time.Sleep(-time.Since(req.expire))
delete(responseCallback, req.key)
}
}()
}
func send(to, subject, msg string) {
logger.Println("notification:", "SendMail:", msg, "for", to)
if err := smtp.SendMail(config["SMTPAddr"], mailAuth, "no-reply@"+config["Domain"], []string{to}, []byte("To: "+to+"\nSubject: ["+config["ServerName"]+"] "+subject+"\nContent-Type: text/html; charset=\"UTF-8\"\n"+msg)); err != nil {
logger.Println("SendMail:", err.Error())
}
}
func parseRef(data string) []cid {
var m = map[cid]struct{}{}
t := html.NewTokenizer(strings.NewReader(data))
for {
t.Next()
token := t.Token()
if token.Type == html.ErrorToken {
break
}
if token.Type == html.StartTagToken &&
token.DataAtom == atom.Blockquote {
for _, attr := range token.Attr {
if attr.Key == "cite" {
if s := attr.Val; strings.HasPrefix(s, "#comment-") {
id, err := strconv.ParseUint(s[len("#comment-"):], 10, 32)
if err != nil {
logger.Println("notification:", err.Error())
continue
}
m[cid(id)] = struct{}{}
}
break
}
}
}
}
var ret []cid
for k, _ := range m {
ret = append(ret, k)
}
return ret
}