Add support for custom billing invoice email address

Fixes #782

data/database.py

@@ -288,6 +288,7 @@ class User(BaseModel):
   last_invalid_login = DateTimeField(default=datetime.utcnow)
   removed_tag_expiration_s = IntegerField(default=1209600)  # Two weeks
   enabled = BooleanField(default=True)
+  invoice_email_address = CharField(null=True, index=True)
 
   def delete_instance(self, recursive=False, delete_nullable=False):
     # If we are deleting a robot account, only execute the subset of queries necessary.

data/migrations/versions/471caec2cb66_add_invoice_email_address_to_user.py

@@ -0,0 +1,27 @@
+"""Add invoice email address to user
+
+Revision ID: 471caec2cb66
+Revises: 88e0f440a2f
+Create Date: 2015-12-28 13:57:17.761334
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '471caec2cb66'
+down_revision = '88e0f440a2f'
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import mysql
+
+def upgrade(tables):
+    ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('user', sa.Column('invoice_email_address', sa.String(length=255), nullable=True))
+    op.create_index('user_invoice_email_address', 'user', ['invoice_email_address'], unique=False)
+    ### end Alembic commands ###
+
+
+def downgrade(tables):
+    ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('user', 'invoice_email_address')
+    ### end Alembic commands ###

data/model/user.py

@@ -125,7 +125,13 @@ def change_username(user_id, new_username):
     return user
 
 
-def change_invoice_email(user, invoice_email):
+def change_invoice_email_address(user, invoice_email_address):
+  # Note: We null out the address if it is an empty string.
+  user.invoice_email_address = invoice_email_address or None
+  user.save()
+
+
+def change_send_invoice_email(user, invoice_email):
   user.invoice_email = invoice_email
   user.save()