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

internal/web/base.go

@@ -30,6 +30,12 @@ import (
 	"github.com/superseriousbusiness/gotosocial/internal/config"
 	"github.com/superseriousbusiness/gotosocial/internal/processing"
 	"github.com/superseriousbusiness/gotosocial/internal/router"
+	"github.com/superseriousbusiness/gotosocial/internal/util"
+)
+
+const (
+	confirmEmailPath = "/" + util.ConfirmEmailPath
+	tokenParam       = "token"
 )
 
 // Module implements the api.ClientModule interface for web pages.
@@ -100,6 +106,9 @@ func (m *Module) Route(s router.Router) error {
 	// serve statuses
 	s.AttachHandler(http.MethodGet, "/:user/statuses/:id", m.threadTemplateHandler)
 
+	// serve email confirmation page at /confirm_email?token=whatever
+	s.AttachHandler(http.MethodGet, confirmEmailPath, m.confirmEmailGETHandler)
+
 	// 404 handler
 	s.AttachNoRouteHandler(m.NotFoundHandler)