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package msg
import (
"bufio"
"errors"
"net/url"
"strings"
"git.sr.ht/~sircmpwn/aerc/lib"
"git.sr.ht/~sircmpwn/aerc/widgets"
)
// Unsubscribe helps people unsubscribe from mailing lists by way of the
// List-Unsubscribe header.
type Unsubscribe struct{}
func init() {
register(Unsubscribe{})
}
// Aliases returns a list of aliases for the :unsubscribe command
func (Unsubscribe) Aliases() []string {
return []string{"unsubscribe"}
}
// Complete returns a list of completions
func (Unsubscribe) Complete(aerc *widgets.Aerc, args []string) []string {
return nil
}
// Execute runs the Unsubscribe command
func (Unsubscribe) Execute(aerc *widgets.Aerc, args []string) error {
if len(args) != 1 {
return errors.New("Usage: unsubscribe")
}
widget := aerc.SelectedTab().(widgets.ProvidesMessage)
msg, err := widget.SelectedMessage()
if err != nil {
return err
}
headers := msg.RFC822Headers
if !headers.Has("list-unsubscribe") {
return errors.New("No List-Unsubscribe header found")
}
methods := parseUnsubscribeMethods(headers.Get("list-unsubscribe"))
aerc.Logger().Printf("found %d unsubscribe methods", len(methods))
for _, method := range methods {
aerc.Logger().Printf("trying to unsubscribe using %v", method)
switch method.Scheme {
case "mailto":
return unsubscribeMailto(aerc, method)
case "http", "https":
return unsubscribeHTTP(method)
default:
aerc.Logger().Printf("skipping unrecognized scheme: %s", method.Scheme)
}
}
return errors.New("no supported unsubscribe methods found")
}
// parseUnsubscribeMethods reads the list-unsubscribe header and parses it as a
// list of angle-bracket <> deliminated URLs. See RFC 2369.
func parseUnsubscribeMethods(header string) (methods []*url.URL) {
r := bufio.NewReader(strings.NewReader(header))
for {
// discard until <
_, err := r.ReadSlice('<')
if err != nil {
return
}
// read until <
m, err := r.ReadSlice('>')
if err != nil {
return
}
m = m[:len(m)-1]
if u, err := url.Parse(string(m)); err == nil {
methods = append(methods, u)
}
}
}
func unsubscribeMailto(aerc *widgets.Aerc, u *url.URL) error {
widget := aerc.SelectedTab().(widgets.ProvidesMessage)
acct := widget.SelectedAccount()
defaults := map[string]string{
"To": u.Opaque,
"Subject": u.Query().Get("subject"),
}
composer := widgets.NewComposer(
aerc.Config(),
acct.AccountConfig(),
acct.Worker(),
defaults,
)
composer.SetContents(strings.NewReader(u.Query().Get("body")))
tab := aerc.NewTab(composer, "unsubscribe")
composer.OnHeaderChange("Subject", func(subject string) {
if subject == "" {
tab.Name = "unsubscribe"
} else {
tab.Name = subject
}
tab.Content.Invalidate()
})
return nil
}
func unsubscribeHTTP(u *url.URL) error {
return lib.OpenFile(u.String())
}
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