[Rails5] Fix ActionCable '/cable' mountpoint conflict
Since Rails 5.0 the new framework has been added. It's called ActionCable. It brings WebSockets support to rails applications. By default the mountpoint of WebSocket requests is `/cable` [1]. GitLab allows using top level names as namespaces or usernames. For example, `gitlab.com/cable` at this moment leads to a user with the nickname `cable`. This commit changes ActionCable's mountpoint to a reserved top level word `-`. This is just a stub and should not be be used in real work. Please set correct mountpoints for each environments when configuring ActionCable for real using. [1]: https://github.com/rails/rails/blob/5-0-stable/actioncable/lib/action_cable.rb#L38
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title: "[Rails5] Fix ActionCable '/cable' mountpoint conflict"
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merge_request: 20015
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author: "@blackst0ne"
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type: fixed
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@ -57,6 +57,13 @@ module Gitlab
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# Configure the default encoding used in templates for Ruby 1.9.
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config.encoding = "utf-8"
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# ActionCable mount point.
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# The default Rails' mount point is `/cable` which may conflict with existing
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# namespaces/users.
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# https://github.com/rails/rails/blob/5-0-stable/actioncable/lib/action_cable.rb#L38
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# Please change this value when configuring ActionCable for real usage.
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config.action_cable.mount_path = "-" if rails5?
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# Configure sensitive parameters which will be filtered from the log file.
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#
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# Parameters filtered:
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