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

example/config.yaml

@@ -360,3 +360,35 @@ oidc:
     - "email"
     - "profile"
     - "groups"
+
+#######################
+##### SMTP CONFIG #####
+#######################
+
+# Config for sending emails via an smtp server. See https://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol
+smtp:
+
+  # String. The hostname of the smtp server you want to use.
+  # If this is not set, smtp will not be used to send emails, and you can ignore the other settings.
+  # Examples: ["mail.example.org", "localhost"]
+  # Default: ""
+  host: ""
+  # Int. Port to use to connect to the smtp server.
+  # Examples: []
+  # Default: 0
+  port: 0
+  # String. Username to use when authenticating with the smtp server.
+  # This should have been provided to you by your smtp host.
+  # This is often, but not always, an email address.
+  # Examples: ["maillord@example.org"]
+  # Default: ""
+  username:
+  # String. Password to use when authenticating with the smtp server.
+  # This should have been provided to you by your smtp host.
+  # Examples: ["1234", "password"]
+  # Default: ""
+  password:
+  # String. 'From' address for sent emails.
+  # Examples: ["mail@example.org"]
+  # Default: ""
+  from: ""