smtp + email confirmation (#285)

* add smtp configuration

* add email confirm + reset templates

* add email sender to testrig

* flesh out the email sender interface

* go fmt

* golint

* update from field with more clarity

* tidy up the email formatting

* fix tests

* add email sender to processor

* tidy client api processing a bit

* further tidying in fromClientAPI

* pin new account to user

* send msg to processor on new account creation

* generate confirm email uri

* remove emailer from account processor again

* add processCreateAccountFromClientAPI

* move emailer accountprocessor => userprocessor

* add email sender to user processor

* SendConfirmEmail function

* add noop email sender

* use noop email sender in tests

* only assemble message if callback is not nil

* use noop email sender if no smtp host is defined

* minify email html before sending

* fix wrong email address

* email confirm test

* fmt

* serve web hndler

* add email confirm handler

* init test log properly on testrig

* log emails that *would* have been sent

* go fmt ./...

* unexport confirm email handler

* updatedAt

* test confirm email function

* don't allow tokens older than 7 days

* change error message a bit

* add basic smtp docs

* add a few more snippets

* typo

* add email sender to outbox tests

* don't use dutch wikipedia link

* don't minify email html

2 files changed, 60 insertions, 0 deletions

diff --git a/cmd/gotosocial/flags.go b/cmd/gotosocial/flags.go
index 355ec0b81..8e162f6c7 100644
--- a/cmd/gotosocial/flags.go
+++ b/cmd/gotosocial/flags.go
@@ -39,6 +39,7 @@ func getFlags() []cli.Flag {
 		statusesFlags(flagNames, envNames, defaults),
 		letsEncryptFlags(flagNames, envNames, defaults),
 		oidcFlags(flagNames, envNames, defaults),
+		smtpFlags(flagNames, envNames, defaults),
 	}
 	for _, fs := range flagSets {
 		flags = append(flags, fs...)
diff --git a/cmd/gotosocial/smtpflags.go b/cmd/gotosocial/smtpflags.go
new file mode 100644
index 000000000..5c790ef7e
--- /dev/null
+++ b/cmd/gotosocial/smtpflags.go
@@ -0,0 +1,59 @@
+/*
+   GoToSocial
+   Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package main
+
+import (
+	"github.com/superseriousbusiness/gotosocial/internal/config"
+	"github.com/urfave/cli/v2"
+)
+
+func smtpFlags(flagNames, envNames config.Flags, defaults config.Defaults) []cli.Flag {
+	return []cli.Flag{
+		&cli.StringFlag{
+			Name:    flagNames.SMTPHost,
+			Usage:   "Host of the smtp server. Eg., 'smtp.eu.mailgun.org'",
+			Value:   defaults.SMTPHost,
+			EnvVars: []string{envNames.SMTPHost},
+		},
+		&cli.IntFlag{
+			Name:    flagNames.SMTPPort,
+			Usage:   "Port of the smtp server. Eg., 587",
+			Value:   defaults.SMTPPort,
+			EnvVars: []string{envNames.SMTPPort},
+		},
+		&cli.StringFlag{
+			Name:    flagNames.SMTPUsername,
+			Usage:   "Username to authenticate with the smtp server as. Eg., 'postmaster@mail.example.org'",
+			Value:   defaults.SMTPUsername,
+			EnvVars: []string{envNames.SMTPUsername},
+		},
+		&cli.StringFlag{
+			Name:    flagNames.SMTPPassword,
+			Usage:   "Password to pass to the smtp server.",
+			Value:   defaults.SMTPPassword,
+			EnvVars: []string{envNames.SMTPPassword},
+		},
+		&cli.StringFlag{
+			Name:    flagNames.SMTPFrom,
+			Usage:   "Address to use as the 'from' field of the email. Eg., 'gotosocial@example.org'",
+			Value:   defaults.SMTPFrom,
+			EnvVars: []string{envNames.SMTPFrom},
+		},
+	}
+}