Removes InputMail.FROM_EMAIL_ADDRESS constant #578

- Created the replier component to generate the reply dict for the
  email. This was needed to decouple the InputMail from the need to know
  who is the logged user.

1 files changed, 32 insertions, 0 deletions

diff --git a/service/pixelated/support/replier.py b/service/pixelated/support/replier.py
new file mode 100644
index 00000000..0bcb1a27
--- /dev/null
+++ b/service/pixelated/support/replier.py
@@ -0,0 +1,32 @@
+from email.utils import parseaddr
+
+
+def generate_recipients(sender, to, ccs, current_user):
+    result = {'single': None, 'all': {'to-field': [], 'cc-field': []}}
+
+    to.append(sender)
+    to = remove_duplicates(to)
+    ccs = remove_duplicates(ccs)
+
+    result['single'] = swap_recipient_if_needed(sender, remove_address(to, current_user), current_user)
+    result['all']['to-field'] = remove_address(to, current_user) if len(to) > 1 else to
+    result['all']['cc-field'] = remove_address(ccs, current_user) if len(ccs) > 1 else ccs
+    return result
+
+
+def remove_duplicates(recipients):
+    return list(set(recipients))
+
+
+def remove_address(recipients, current_user):
+    return [recipient for recipient in recipients if not parsed_mail_matches(recipient, current_user)]
+
+
+def parsed_mail_matches(to_parse, expected):
+    return parseaddr(to_parse)[1] == expected
+
+
+def swap_recipient_if_needed(sender, recipients, current_user):
+    if len(recipients) == 1 and parsed_mail_matches(sender, current_user):
+        return recipients[0]
+    return sender