Anonymous login

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This is a very simple, lightweight module that will redirect anonymous users to the login page whenever they reach any admin-specified page paths, and will direct them back to the originally-requested page after successful login.

Use-case examples

1) You want to restrict your entire site to authenticated users. Simply enter "*" as the only path to redirect and all anonymous traffic will be redirected to the login page.

2) Your website sends out emails that contain links that only authenticated users can reach (edit your account, edit a node, view a private message, etc). If the user clicks the link from the email and they are not currently logged in they will reach an "Access denied" page; which is horrible for usability. With this module enabled and configured to act on node/*/edit paths, if a user clicks a link to site.com/node/123/edit, they will be redirected to site.com/user/login?destination=node/123/edit, so they can log in, then be brought to the page originally requested.

Configuration

After enabling the module, navigate to the admin settings page (D7: admin/config/system/anonymous-login, D8: admin/config/user-interface/anonymous-login). You can then enter a list of page paths (wildcards [*] are supported), which will redirect anonymous users to the login page when visited. Also supported are patterns for which paths will be ignored.
To exclude some paths for a multilingual site you can use wildcards [*]:

~/*/user/register
~/*/user/password

or use language prefixes (e.g. for English and Spanish):

~/en/user/register
~/en/user/password
~/es/user/register
~/es/user/password