Allow omission of EMAIL_GATEWAY_BOT and stream emails

(imported from commit 51412d2a46bbacd6537ef892e7b6bdf33ac94079)

static/templates/subscription.handlebars

@@ -48,12 +48,12 @@
           </li>
         </ul>
       </div>
-      {{#if subscribed}}
+      {{#if_and subscribed email_address}}
       <div>
           <p><b>Email address</b> <span class="email-address">{{email_address}}
              <i class="icon-vector-question-sign" id="email-address-hint-{{id}}"></i></span></p>
       </div>
-      {{/if}}
+      {{/if_and}}
 
       {{#if allow_rename}}
         <div class="rename-stream">

zerver/lib/actions.py

@@ -1518,6 +1518,10 @@ def encode_email_address(stream):
     return encode_email_address_helper(stream.name, stream.email_token)
 
 def encode_email_address_helper(name, email_token):
+    # Some deployments may not use the email gateway
+    if settings.EMAIL_GATEWAY_PATTERN == '':
+        return ''
+
     # Given the fact that we have almost no restrictions on stream names and
     # that what characters are allowed in e-mail addresses is complicated and
     # dependent on context in the address, we opt for a very simple scheme:

zproject/local_settings_template.py

@@ -39,6 +39,29 @@ TWITTER_CONSUMER_SECRET = ''
 TWITTER_ACCESS_TOKEN_KEY = ''
 TWITTER_ACCESS_TOKEN_SECRET = ''
 
+# The email gateway provides an email address that you can use to post to a stream
+# Emails received at the per-stream email address will be converted into a Zulip
+# message
+
+# The email address pattern to use for auto-generated stream emails
+# The %s will be replaced with a unique token, and the resulting email
+# must be delivered to the EMAIL_GATEWAY_IMAP_FOLDER of the EMAIL_GATEWAY_LOGIN account below
+EMAIL_GATEWAY_PATTERN = ""
+
+# The Zulip username of the bot that the email pattern should post as
+EMAIL_GATEWAY_BOT = ""
+
+# Configuration of the email mirror mailbox
+# The IMAP login and password
+EMAIL_GATEWAY_LOGIN = ""
+EMAIL_GATEWAY_PASSWORD = ""
+# The IMAP server & port to connect to
+EMAIL_GATEWAY_IMAP_SERVER = ""
+EMAIL_GATEWAY_IMAP_PORT = 993
+# The IMAP folder name to check for emails. All emails sent to EMAIL_GATEWAY_PATTERN above
+# must be delivered to this folder
+EMAIL_GATEWAY_IMAP_FOLDER = "INBOX"
+
 # When using SSO: If REMOTE_USER only provides a username, append this domain
 # to the returned value.
 SSO_APPEND_DOMAIN = None

zproject/settings.py

@@ -232,6 +232,7 @@ DEFAULT_SETTINGS = {'TWITTER_CONSUMER_KEY': '',
                     'TWITTER_ACCESS_TOKEN_KEY': '',
                     'TWITTER_ACCESS_TOKEN_SECRET': '',
                     'EMBEDLY_KEY': '',
+                    'EMAIL_GATEWAY_PATTERN': '',
                     'EMAIL_GATEWAY_BOT': None,
                     'EMAIL_GATEWAY_LOGIN': None,
                     'EMAIL_GATEWAY_PASSWORD': None,