start work on invite keys

app/templates/users/sign_up.html

@@ -4,13 +4,22 @@
 {%- block title -%}sign up{%- endblock -%}
 {%- block content -%}
 {%- set welcome -%}
-Please read the rules etc. stub
+<p>Please read the rules etc. stub</p>
+{%- if not inviter -%}
+<p>After you sign up, a moderator will need to confirm your account before you will be allowed to post.
+{%- else -%}
+You have been invited by <a href="{{url_for('users.user_page', username=inviter.username)}}">{{inviter.get_readable_name()}}</a> to join {{config.SITE_NAME}}. Create an identity below.
+{%- endif -%}
+</p>
 {%- endset -%}
 {{ subheader('Sign up', welcome)}}
 {%- if request.args.get('error') -%}
   {{infobox(request.args.error, InfoboxKind.ERROR)}}
 {%- endif -%}
 <form class="plank primary-bg full-width" method="POST">
+  {%- if invite -%}
+  <input type="hidden" name="key" value="{{invite.key}}">
+  {%- endif -%}
   <label for="username">Username</label>
   <input type="text" id="username" name="username" pattern="[a-zA-Z0-9_\-]{3,24}" title="3-24 characters. Only upper and lowercase letters, digits, hyphens, and underscores" autocomplete="username" required>
   <label for="password">Create password</label>
@@ -18,6 +27,6 @@ Please read the rules etc. stub
   <label for="password2">Confirm password</label>
   <input type="password" id="password2" name="password" pattern="(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[\W_])(?!.*\s).{10,255}" title="10+ chars with at least: 1 uppercase, 1 lowercase, 1 number, 1 special char, and no spaces" autocomplete="new-password" required>
   <span><input type="checkbox" name="remember" id="remember"> <label for="remember">Remember me</label></span>
-  <input type="submit" value="Sign up">
+  <input type="submit" value="Sign up" class="alt">
 </form>
 {%- endblock -%}