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listener.go
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listener.go
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package ipn
import (
"bytes"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"github.com/pkg/errors"
)
//LiveIPNEndpoint contains the notification verification URL
const LiveIPNEndpoint = "https://www.paypal.com/cgi-bin/webscr"
//SandboxIPNEndpoint is the Sandbox notification verification URL
const SandboxIPNEndpoint = "https://ipnpb.sandbox.paypal.com/cgi-bin/webscr"
var Debug = false
func getEndpoint(testIPN bool) string {
if testIPN {
return SandboxIPNEndpoint
}
return LiveIPNEndpoint
}
//Listener creates a PayPal listener.
//if err is set in cb, PayPal will resend the notification at some future point.
func Listener(cb func(err error, n *Notification)) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
body, err := ioutil.ReadAll(r.Body)
if err != nil {
cb(errors.Wrap(err, "failed to read body"), nil)
return
}
form, err := url.ParseQuery(string(body))
if err != nil {
cb(errors.Wrap(err, "failed to parse query"), nil)
return
}
notification := ReadNotification(form)
if Debug {
fmt.Printf("paypal: form: %s, parsed: %+v\n", body, notification)
}
body = append([]byte("cmd=_notify-validate&"), body...)
resp, err := http.Post(getEndpoint(notification.TestIPN), r.Header.Get("Content-Type"), bytes.NewReader(body))
if err != nil {
cb(errors.Wrap(err, "failed to create post verification req"), nil)
return
}
defer resp.Body.Close()
verifyStatus, err := ioutil.ReadAll(resp.Body)
if err != nil {
cb(errors.Wrap(err, "failed to read verification response"), nil)
return
}
if string(verifyStatus) != "VERIFIED" {
cb(errors.Errorf("unexpected verify status %q", verifyStatus), nil)
return
}
// notification confirmed here
// tell PayPal to not send more notificatins
w.WriteHeader(http.StatusOK)
cb(nil, notification)
}
}