Use a local IMAP caching proxy under the webmail.

(Unless the webmail is itself a full IMAP server.) It replaces
RoundCube's own IMAP and message caches.

Dovecot's IMAPC storage backend is not very documented, but provides
smart IMAP proxying. References include:

http://dovecot.org/pipermail/dovecot/2011-January/056975.html
http://wiki2.dovecot.org/HowTo/ImapcProxy
http://wiki2.dovecot.org/Migration/Dsync

1 files changed, 51 insertions, 0 deletions

diff --git a/roles/IMAP-proxy/tasks/main.yml b/roles/IMAP-proxy/tasks/main.yml
new file mode 100644
index 0000000..c630cfd
--- /dev/null
+++ b/roles/IMAP-proxy/tasks/main.yml
@@ -0,0 +1,51 @@
+- name: Install Dovecot
+  apt: pkg={{ item }}
+  with_items:
+    - dovecot-core
+    - dovecot-imapd
+
+- name: Create a user 'imapproxy'
+  user: name=imapproxy system=yes
+        home=/home/imapproxy
+        shell=/bin/false
+        password=!
+        state=present
+
+- name: Create a home directory for user 'imapproxy'
+  file: path=/home/imapproxy
+        state=directory
+        owner=imapproxy group=imapproxy
+        mode=0700
+
+- name: Configure Dovecot (1)
+  copy: src=etc/dovecot/conf.d/{{ item }}
+        dest=/etc/dovecot/conf.d/{{ item }}
+        owner=root group=root
+        mode=0644
+  register: r1
+  with_items:
+    - 10-auth.conf
+    - 10-logging.conf
+    - 10-mail.conf
+    - 10-master.conf
+    - 15-mailboxes.conf
+  notify:
+    - Restart Dovecot
+
+- name: Configure Dovecot (2)
+  template: src=etc/dovecot/conf.d/{{ item }}.j2
+            dest=/etc/dovecot/conf.d/{{ item }}
+            owner=root group=root
+            mode=0644
+  register: r2
+  with_items:
+    - 20-imapc.conf
+    - auth-imap.conf.ext
+  notify:
+    - Restart Dovecot
+
+- name: Start Dovecot
+  service: name=dovecot state=started
+  when: not (r1.changed or r2.changed)
+
+- meta: flush_handlers