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Add function for logging in via emailed link

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This doesn't add any user-facing behavior, but provides the basic functionality
to generate a one-time use token and email it to a user, so they can log in with
a link instead of a password.
This commit is contained in:
Matt Baer 2023-09-25 18:21:20 -04:00
parent e2fde518ca
commit 7dda53146d
1 changed files with 49 additions and 0 deletions
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49
account.go
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@ -13,6 +13,7 @@ package writefreely
import (
"encoding/json"
"fmt"
"github.com/mailgun/mailgun-go"
"html/template"
"net/http"
"regexp"
@ -1237,6 +1238,54 @@ func viewSettings(app *App, u *User, w http.ResponseWriter, r *http.Request) err
return nil
}
func loginViaEmail(app *App, alias, redirectTo string) error {
if !app.cfg.Email.Enabled() {
return fmt.Errorf("EMAIL ISN'T CONFIGURED on this server")
}
// Make sure user has added an email
// TODO: create a new func to just get user's email; "ForAuth" doesn't match here
u, _ := app.db.GetUserForAuth(alias)
if u == nil {
if strings.IndexAny(alias, "@") > 0 {
return ErrUserNotFoundEmail
}
return ErrUserNotFound
}
if u.Email.String == "" {
return impart.HTTPError{http.StatusPreconditionFailed, "User doesn't have an email address. Log in with password, instead."}
}
// Generate one-time login token
t, err := app.db.GetTemporaryOneTimeAccessToken(u.ID, 60*15, true)
if err != nil {
log.Error("Unable to generate token for email login: %s", err)
return impart.HTTPError{http.StatusInternalServerError, "Unable to generate token."}
}
// Send email
gun := mailgun.NewMailgun(app.cfg.Email.Domain, app.cfg.Email.MailgunPrivate)
toEmail := u.EmailClear(app.keys)
footerPara := "This link will only work once and expires in 15 minutes. Didn't ask us to log in? You can safely ignore this email."
plainMsg := fmt.Sprintf("Log in to %s here: %s/login?to=%s&with=%s\n\n%s", app.cfg.App.SiteName, app.cfg.App.Host, redirectTo, t, footerPara)
m := mailgun.NewMessage(app.cfg.App.SiteName+" <noreply-login@"+app.cfg.Email.Domain+">", "Log in to "+app.cfg.App.SiteName, plainMsg, fmt.Sprintf("<%s>", toEmail))
m.AddTag("Email Login")
m.SetHtml(fmt.Sprintf(`<html>
<body style="font-family:Lora, 'Palatino Linotype', Palatino, Baskerville, 'Book Antiqua', 'New York', 'DejaVu serif', serif; font-size: 100%%; margin:1em 2em;">
<div style="margin:0 auto; max-width: 40em; font-size: 1.2em;">
<h1 style="font-size:1.75em"><a style="text-decoration:none;color:#000;" href="%s">%s</a></h1>
<p style="font-size:1.2em;margin-bottom:1.5em;text-align:center"><a href="%s/login?to=%s&with=%s">Log in to %s here</a>.</p>
<p style="font-size: 0.86em;color:#666;text-align:center;max-width:35em;margin:1em auto">%s</p>
</div>
</body>
</html>`, app.cfg.App.Host, app.cfg.App.SiteName, app.cfg.App.Host, redirectTo, t, app.cfg.App.SiteName, footerPara))
_, _, err = gun.Send(m)
return err
}
func saveTempInfo(app *App, key, val string, r *http.Request, w http.ResponseWriter) error {
session, err := app.sessionStore.Get(r, "t")
if err != nil {