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Original file line number | Diff line number | Diff line change |
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= New Features | ||
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* A permissions_policy plugin has been added that allows you to easily set a | ||
Permissions-Policy header for the application, which browsers can use to | ||
determine whether to allow specific functionality on the returned page | ||
(mainly related to which JavaScript APIs the page is allowed to use). | ||
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You would generally call the plugin with a block to set the default policy: | ||
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plugin :permissions_policy do |pp| | ||
pp.camera :none | ||
pp.fullscreen :self | ||
pp.clipboard_read :self, 'https://example.com' | ||
end | ||
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Then, anywhere in the routing tree, you can customize the policy for just that | ||
branch or action using the same block syntax: | ||
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r.get 'foo' do | ||
permissions_policy do |pp| | ||
pp.camera :self | ||
end | ||
# ... | ||
end | ||
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In addition to using a block, you can also call methods on the object returned | ||
by the method: | ||
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r.get 'foo' do | ||
permissions_policy.camera :self | ||
# ... | ||
end | ||
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You can use the :default plugin option to set the default for all settings. | ||
For example, to disallow all access for each setting by default: | ||
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plugin :permissions_policy, default: :none | ||
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The following methods are available for configuring the permissions policy, | ||
which specify the setting (substituting _ with -): | ||
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* accelerometer | ||
* ambient_light_sensor | ||
* autoplay | ||
* bluetooth | ||
* camera | ||
* clipboard_read | ||
* clipboard_write | ||
* display_capture | ||
* encrypted_media | ||
* fullscreen | ||
* geolocation | ||
* gyroscope | ||
* hid | ||
* idle_detection | ||
* keyboard_map | ||
* magnetometer | ||
* microphone | ||
* midi | ||
* payment | ||
* picture_in_picture | ||
* publickey_credentials_get | ||
* screen_wake_lock | ||
* serial | ||
* sync_xhr | ||
* usb | ||
* web_share | ||
* window_management | ||
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All of these methods support any number of arguments, and each argument should | ||
be one of the following values: | ||
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:all :: Grants permission to all domains (must be only argument) | ||
:none :: Does not allow permission at all (must be only argument) | ||
:self :: Allows feature in current document and any nested browsing contexts | ||
that use the same domain as the current document. | ||
:src :: Allows feature in current document and any nested browsing contexts | ||
that use the same domain as the src of the iframe. | ||
String :: Specifies origin domain where access is allowed | ||
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When calling a method with no arguments, the setting is removed from the policy instead | ||
of being left empty, since all of these setting require at least one value. Likewise, | ||
if the policy does not have any settings, the header will not be added. | ||
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Calling the method overrides any previous setting. Each of the methods has +add_*+ and | ||
+get_*+ methods defined. The +add_*+ method appends to any existing setting, and the +get_*+ method | ||
returns the current value for the setting (this will be +:all+ if all domains are allowed, or | ||
any array of strings/:self/:src). | ||
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permissions_policy.fullscreen :self, 'https://example.com' | ||
# fullscreen (self "https://example.com") | ||
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permissions_policy.add_fullscreen 'https://*.example.com' | ||
# fullscreen (self "https://example.com" "https://*.example.com") | ||
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permissions_policy.get_fullscreen | ||
# => [:self, "https://example.com", "https://*.example.com"] | ||
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The clear method can be used to remove all settings from the policy. |
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