030f390436
The unsubscribe command, available when in a message viewer context, enables users to easily unsubscribe from mailing lists. When the command is executed, aerc looks for a List-Unsubscribe header as defined in RFC 2369. If found, aerc will attempt to present the user with a suitable interface for completing the request. Currently, mailto and http(s) URLs are supported. In the case of a HTTP(S) URL, aerc will open the link in a browser. For mailto links, a new composer tab will be opened with a message filled out according to the URL. The message is not sent automatically in order to provide the user a chance to review it first. Closes #101
103 lines
2.7 KiB
Go
103 lines
2.7 KiB
Go
package msg
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import (
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"bufio"
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"errors"
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"net/url"
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"strings"
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"git.sr.ht/~sircmpwn/aerc/lib"
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"git.sr.ht/~sircmpwn/aerc/widgets"
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)
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// Unsubscribe helps people unsubscribe from mailing lists by way of the
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// List-Unsubscribe header.
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type Unsubscribe struct{}
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func init() {
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register(Unsubscribe{})
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}
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// Aliases returns a list of aliases for the :unsubscribe command
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func (Unsubscribe) Aliases() []string {
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return []string{"unsubscribe"}
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}
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// Complete returns a list of completions
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func (Unsubscribe) Complete(aerc *widgets.Aerc, args []string) []string {
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return nil
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}
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// Execute runs the Unsubscribe command
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func (Unsubscribe) Execute(aerc *widgets.Aerc, args []string) error {
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if len(args) != 1 {
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return errors.New("Usage: unsubscribe")
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}
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widget := aerc.SelectedTab().(widgets.ProvidesMessage)
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headers := widget.SelectedMessage().RFC822Headers
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if !headers.Has("list-unsubscribe") {
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return errors.New("No List-Unsubscribe header found")
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}
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methods := parseUnsubscribeMethods(headers.Get("list-unsubscribe"))
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aerc.Logger().Printf("found %d unsubscribe methods", len(methods))
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for _, method := range methods {
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aerc.Logger().Printf("trying to unsubscribe using %v", method)
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switch method.Scheme {
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case "mailto":
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return unsubscribeMailto(aerc, method)
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case "http", "https":
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return unsubscribeHTTP(method)
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default:
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aerc.Logger().Printf("skipping unrecognized scheme: %s", method.Scheme)
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}
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}
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return errors.New("no supported unsubscribe methods found")
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}
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// parseUnsubscribeMethods reads the list-unsubscribe header and parses it as a
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// list of angle-bracket <> deliminated URLs. See RFC 2369.
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func parseUnsubscribeMethods(header string) (methods []*url.URL) {
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r := bufio.NewReader(strings.NewReader(header))
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for {
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// discard until <
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_, err := r.ReadSlice('<')
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if err != nil {
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return
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}
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// read until <
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m, err := r.ReadSlice('>')
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if err != nil {
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return
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}
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m = m[:len(m)-1]
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if u, err := url.Parse(string(m)); err == nil {
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methods = append(methods, u)
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}
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}
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}
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func unsubscribeMailto(aerc *widgets.Aerc, u *url.URL) error {
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widget := aerc.SelectedTab().(widgets.ProvidesMessage)
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acct := widget.SelectedAccount()
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composer := widgets.NewComposer(aerc.Config(), acct.AccountConfig(),
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acct.Worker())
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composer.Defaults(map[string]string{
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"To": u.Opaque,
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"Subject": u.Query().Get("subject"),
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})
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composer.SetContents(strings.NewReader(u.Query().Get("body")))
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tab := aerc.NewTab(composer, "unsubscribe")
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composer.OnSubjectChange(func(subject string) {
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if subject == "" {
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tab.Name = "unsubscribe"
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} else {
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tab.Name = subject
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}
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tab.Content.Invalidate()
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})
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return nil
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}
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func unsubscribeHTTP(u *url.URL) error {
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return lib.OpenFile(u.String())
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}
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