Spec "Referer" and "Origin" headers in reporting beacons.

spec.bs

@@ -727,12 +727,18 @@ A <dfn export for=fencedframetype>pending event</dfn> is a [=struct=] with the f
 
   : <dfn>event</dfn>
   :: a [=fencedframetype/destination event=]
+
+  : <dfn>request initiator</dfn>
+  :: an [=origin=]
 </dl>
 
 A <dfn export for=fencedframetype>reporting destination info</dfn> is a [=struct=] with the
 following [=struct/items=]:
 
 <dl export dfn-for="reporting destination info">
+  : <dfn>reporting url declarer origin</dfn>
+  :: an [=origin=]
+
   : <dfn>reporting url map</dfn>
   :: a [=map=] whose [=map/keys=] are [=strings=] and whose [=map/values=] are [=URLs=]
 
@@ -761,17 +767,21 @@ be sent.
 
 <div algorithm>
   In order to <dfn export>finalize a reporting destination</dfn>, given a [=fencedframetype/fenced
-  frame reporting map=] |reporting map|, a {{FenceReportingDestination}} |destination|, a [=map=]
-  |destination map| whose [=map/keys=] are [=strings=] and whose [=map/values=] are [=urls=], and
-  |macro map|, which is either null or a [=map=] whose [=map/keys=] are [=strings=] and whose
-  [=map/values=] are [=strings=], run these steps:
+  frame reporting map=] |reporting map|, a {{FenceReportingDestination}} |destination|, an
+  [=origin=] |reporting url declarer origin|, a [=map=] |destination map| whose [=map/keys=] are
+  [=strings=] and whose [=map/values=] are [=urls=], and |macro map|, which is either null or a
+  [=map=] whose [=map/keys=] are [=strings=] and whose [=map/values=] are [=strings=], run these
+  steps:
 
   1. [=Assert=] that |reporting map|[|destination|] is a [=list=] (i.e., that |destination|'s
      metadata has not yet been finalized).
 
   1. Let |pending event list| be |reporting map|[|destination|].
 
   1. [=map/Set=] |reporting map|[|destination|] to a [=struct=] with the following [=struct/items=]:
+       : [=reporting destination info/reporting url declarer origin=]
+       :: |reporting url declarer origin|
+
        : [=reporting destination info/reporting url map=]
        :: |destination map|
 
@@ -780,7 +790,8 @@ be sent.
 
   1. [=list/For each=] |pending event| of |pending event list|:
 
-     1. [=Send a beacon=] with |destination map| and |pending event|'s [=pending event/event=].
+     1. [=Send a beacon=] with |destination map|, |pending event|'s [=pending event/event=], and
+        |pending event|'s [=pending event/request initiator=].
 </div>
 
 A <dfn export for=fencedframetype>fenced frame reporting metadata</dfn> is a [=struct=] with the
@@ -859,7 +870,8 @@ A <dfn for=fencedframetype>destination event</dfn> is either a
 
 <div algorithm>
   In order to <dfn>send a beacon</dfn> with a [=fencedframetype/reporting destination info=]
-  |destination info| and a [=fencedframetype/destination event=] |event|, run these steps:
+  |destination info|, a [=fencedframetype/destination event=] |event|, and an [=origin=]
+  |request initiator|, run these steps:
 
   1. Let |destination url| be an empty [=string=].
 
@@ -947,11 +959,21 @@ A <dfn for=fencedframetype>destination event</dfn> is either a
        beacons](https://wicg.github.io/attribution-reporting-api/#ref-for-request-service-workers-mode).
 
     : [=request/origin=]
-    :: <span class=XXX>Get the origin from somewhere, like the [implementation
-       does](https://source.chromium.org/chromium/chromium/src/+/refs/heads/main:content/browser/fenced_frame/fenced_frame_reporter.cc;l=384;drc=183dd920ea5d6aed92e007c40e226f1f840c0567)</span>.
+    :: |request initiator| if |event| is a [=fencedframetype/destination URL event=], and
+       |destination info|'s [=reporting destination info/reporting url declarer origin=] otherwise.
+
+       Note: The reporting destination for a [=fencedframetype/destination URL event=] is determined
+       by the {{Document}} that calls {{Fence/reportEvent()}}, as opposed to a [=fencedframetype/
+       destination enum event=] or [=fencedframetype/automatic beacon event=] whose reporting
+       destinations are determined in the worklet that created the [=fenced frame config=] that
+       loaded this {{Document}}. We set the [=request/origin=] to the [=origin=] of the {{Document}}
+       or worklet that determined the reporting destination to prevent cross-site request forgery.
 
     : [=request/referrer=]
-    :: `"no-referrer"`
+    :: |request initiator|
+
+    : [=request/referrer policy=]
+    :: `"origin"`
 
     : [=request/mode=]
     :: `"cors"`
@@ -974,8 +996,8 @@ A <dfn for=fencedframetype>destination event</dfn> is either a
 
 <div algorithm>
   In order to <dfn>report an event</dfn> using a [=fencedframetype/fenced frame reporter=]
-  |reporter| with a {{FenceReportingDestination}} |destination|, and a
-  [=fencedframetype/destination event=] |event|, run these steps:
+  |reporter| with a {{FenceReportingDestination}} |destination|, an [=origin=] |request initiator|,
+  and a [=fencedframetype/destination event=] |event|, run these steps:
 
   1. Let |metadata| be |reporter|'s
      [=fenced frame reporter/fenced frame reporting metadata reference=].
@@ -1012,6 +1034,9 @@ A <dfn for=fencedframetype>destination event</dfn> is either a
         : [=pending event/event=]
         :: |event|
 
+        : [=pending event/request initiator=]
+        :: |request initiator|
+
      1. [=list/Append=] |newEvent| to |reporting map|[|destination|].
 
      1. Return.
@@ -1021,7 +1046,7 @@ A <dfn for=fencedframetype>destination event</dfn> is either a
   1. [=Assert=] that |reporting map|[|destination|] is a [=map=] (i.e., that |destination|'s
      metadata has been finalized).
 
-  1. [=Send a beacon=] with |reporting map|[|destination|] and |event|.
+  1. [=Send a beacon=] with |reporting map|[|destination|], |event|, and |request initiator|.
 </div>
 
 <div algorithm>
@@ -1648,6 +1673,9 @@ Several APIs specific to fenced frames are defined on the {{Fence}} interface.
 
   1. If |instance|'s [=fenced frame config instance/fenced frame reporter=] is null, then return.
 
+  1. Let |request initiator| be [=this=]'s [=relevant settings object=]'s [=environment settings
+     object/origin=].
+
   1. If |event| is a {{DOMString}}:
 
      1. If [=this=]'s [=relevant settings object=]'s [=environment settings object/origin=] and
@@ -1686,7 +1714,7 @@ Several APIs specific to fenced frames are defined on the {{Fence}} interface.
            * |destinationURL| [=url/scheme=] is not "`https`";
 
         1. Run [=report an event=] using |instance|'s [=fenced frame config instance/fenced frame
-           reporter=] with {{FenceReportingDestination/buyer}} and a
+           reporter=] with {{FenceReportingDestination/buyer}}, |request initiator|, and a
            [=fencedframetype/destination URL event=] that is |event|'s
            {{FenceEvent/destinationURL}}.
 
@@ -1706,8 +1734,8 @@ Several APIs specific to fenced frames are defined on the {{Fence}} interface.
         1. [=list/For each=] |destination| of |event|'s {{FenceEvent/destination}}:
 
           1. Run [=report an event=] using |instance|'s [=fenced frame config instance/fenced frame
-             reporter=] with |destination| and a [=fencedframetype/destination enum event=] with the
-             following [=struct/items=]:
+             reporter=] with |destination|, |request initiator|, and a [=fencedframetype/destination
+             enum event=] with the following [=struct/items=]:
 
              : [=destination enum event/type=]
              :: |event|'s {{FenceEvent/eventType}}
@@ -1906,6 +1934,10 @@ event|event-level beacon=] when a fenced frame initiates a successful [=navigate
      cases where a [=navigate|navigation=] to a [=top-level traversable=] does not originate from a
      <{fencedframe}>.
 
+  1. Let |request initiator| be |sourceOrigin| if |config|'s [=fenced frame config instance/is ad
+     component=] is false, and |sourceSnapshotParams|'s [=source snapshot params/initiator ancestor
+     root origin=] otherwise.
+
   1. Let |beacon data| be |sourceSnapshotParams|'s [=source snapshot params/automatic beacon data
      map=][|eventType|].
 
@@ -1928,8 +1960,8 @@ event|event-level beacon=] when a fenced frame initiates a successful [=navigate
      [=fencedframetype/fenced frame reporting map=]'s [=map/keys=]:
 
     1. Run [=report an event=] using |config|'s [=fenced frame config instance/fenced frame
-       reporter=] with |destination| and an [=fencedframetype/automatic beacon event=] with the
-       following [=struct/items=]:
+       reporter=] with |destination|, |request initiator|, and an [=fencedframetype/automatic beacon
+       event=] with the following [=struct/items=]:
 
        : [=automatic beacon event/type=]
        :: |eventType|
@@ -2305,8 +2337,6 @@ To mend the intended distinction between [=top-level traversables=] and [=fenced
   [=traversable navigable/unfenced parent=] are both null.
 </div>
 
-<br>
-
 <div algorithm>
   To get the <dfn noexport for="navigable">top-level traversable</dfn> of a [=navigable=] |inputNavigable|:
 
@@ -2684,9 +2714,23 @@ CORP violation report=] algorithm, as leaving it unfenced may cause a privacy le
   : <dfn for="source snapshot params">initiator fenced frame config instance</dfn>
   :: a [=fenced frame config instance=] or null, initially null.
 
+  : <dfn for="source snapshot params">initiator ancestor root origin</dfn>
+  :: an [=origin=] or null, initially null.
+
   : <dfn for="source snapshot params">target fenced frame config</dfn>
   :: a [=fenced frame config=] or null, initially null.
 
+  Note: The [=source snapshot params/initiator fenced frame config instance=] is the [=fenced frame
+  config instance=] that's loaded into a navigation initiator's [=browsing context=], if any exists.
+  The [=source snapshot params/initiator ancestor root origin=], for component ads, is the origin of
+  the top-level ad container, if any exists. They are used by the [=attempt to send an automatic
+  beacon=] algorithm to compare [=origin=]s and determine which {{FenceReportingDestination}}s to
+  send beacons and with what information, if the <{fencedframe}>-initiated navigation succeeds. The
+  [=source snapshot params/target fenced frame config=] on the other hand, is the non-[=instantiate
+  a config|instantiated=] [=fenced frame config=] that will be loaded into a <{fencedframe}> element
+  for navigations targeting fenced frames. These fields do not interact *together* in any meaningful
+  way.
+
   : <dfn for="source snapshot params">attribution reporting enabled</dfn>
   :: a [=boolean=].
 
@@ -2700,14 +2744,6 @@ CORP violation report=] algorithm, as leaving it unfenced may cause a privacy le
   :: a [=map=] whose [=map/keys=] are [=fencedframetype/automatic beacon event type=]s and whose
      [=map/values=] are null or an [=fencedframetype/automatic beacon data=]
 
-  Note: The [=source snapshot params/initiator fenced frame config instance=] is the [=fenced frame
-  config instance=] that's loaded into a navigation initiator's [=browsing context=], if any exists.
-  It is used by the [=attempt to send an automatic beacon=] algorithm to compare [=origin=]s and
-  determine which {{FenceReportingDestination}}s to send beacons to, if the
-  <{fencedframe}>-initiated navigation succeeds. The [=source snapshot params/target fenced frame
-  config=] on the other hand, is the non-[=instantiate a config|instantiated=] [=fenced frame
-  config=] that will be loaded into a <{fencedframe}> element for navigations targeting fenced
-  frames. These fields do not interact *together* in any meaningful way.
 </div>
 
 <div algorithm>
@@ -2741,6 +2777,59 @@ CORP violation report=] algorithm, as leaving it unfenced may cause a privacy le
   [=automatic beacon data/once=] set to true.
 </div>
 
+<div algorithm=get-initiator-ancestor-root-origin>
+  To <dfn>get the initiator ancestor root origin</dfn> of a given {{Document}} |sourceDocument|:
+
+  1. Let |navigable| be |sourceDocument|'s [=node navigable=].
+
+  1. While |navigable| is not null and |navigable| is not a [=fenced navigable container/fenced
+     navigable=]:
+
+     1. Set |navigable| to |navigable|'s [=navigable/parent=].
+
+  1. If |navigable| is null, return null.
+
+  1. Otherwise:
+
+     1. [=Assert=]: |navigable| is a [=fenced navigable container/fenced navigable=].
+
+     1. Set |navigable| to |navigable|'s [=navigable/unfenced parent=].
+
+     1. While |navigable| is not null and |navigable| is not a [=fenced navigable container/fenced
+        navigable=]:
+
+        1. Set |navigable| to |navigable|'s [=navigable/parent=].
+
+     1. If |navigable| is null, return null.
+
+     1. Otherwise, return |navigable|'s [=navigable/active document=]'s [=Document/origin=].
+
+  *The rest of this section is non-normative*.
+
+  Given a {{Document}} embedded inside of a <{fencedframe}>, this algorithm gets the origin
+  for the fenced frame root's ancestor fenced frame root. If there is no fenced frame root (for
+  either of fenced frame roots the algorithm looks for), the algorithm will return null. For
+  example, for the given frame tree structure:
+
+  ```
+  Main frame (origin A)
+    <fencedframe> (origin B)
+      <iframe> (origin C)
+        <fencedframe> (origin D)
+          <iframe> (origin E)
+            <fencedframe> (origin F)
+  ```
+
+  The algorithm will return the following given each document:
+
+  - `Main frame (origin A)` will return `null`.
+  - `<fencedframe> (origin B)` will return `null`.
+  - `<iframe> (origin C)` will return `null`.
+  - `<fencedframe> (origin D)` will return `<fencedframe> (origin B)`.
+  - `<iframe> (origin E)` will return `<fencedframe> (origin B)`.
+  - `<fencedframe> (origin F)` will return `<fencedframe> (origin D)`.
+</div>
+
 <div algorithm=snapshot-source-snapshot-params>
   Modify the [=snapshot source snapshot params=] algorithm to return a [=source snapshot params=]
   with these additional fields:
@@ -2749,6 +2838,10 @@ CORP violation report=] algorithm, as leaving it unfenced may cause a privacy le
   :: |sourceDocument|'s [=browsing context=]'s [=browsing context/fenced frame
      config instance=]
 
+  : [=source snapshot params/initiator ancestor root origin=]
+
+  :: The result of running [=get the initiator ancestor root origin=] on |sourceDocument|.
+
   : [=source snapshot params/attribution reporting enabled=]
   :: The result of determining whether |sourceDocument| is [=allowed to use=] the
      "<code>{{PermissionPolicy/attribution-reporting}}</code>" feature