Implement a ResourceThrottle based navigation intercept

Bug #1470268 reported by Chris Coulson on 2015-06-30
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Chris Coulson

Bug Description

WebView.navigationRequested currently relies on us turning on an option in Chromium to delegate top-level navigations to the browser process, which allows applications to intercept them. There are some issues with the current approach though:

- This navigation path is not used in Chromium, and it's not clear how well tested it is.
- I'm not really sure where it fits in with the re-work of navigations in Chromium (
- It relies on us implementing some of our own navigation logic in oxide::WebView.
- Navigations that should open in a new tab follow a different code path to - they go through our navigation logic, and it's impossible to tell whether we should suppress the opener (we never supply the opener to the new webview, which is wrong).
- This navigation mechanism in Chromium doesn't support POST requests, so the application never has a chance to intercept these.

We should use the normal navigation paths in Chromium, and instead use a ResourceThrottle to intercept navigations. This will introduce a small behavioural change in the API - currently, WebView.navigationRequested fires before a load starts. With this change, a load will start before WebView.navigationRequested fires, and it will be followed by a Stopped or Committed load event depending on the decision.

In the future, this will allow us to intercept navigations later - just before the load is committed when we have the final URL. However, because requests to open a new webview will always have the initial URL and they both share the same API (WebView.navigationRequested), I don't intend to change this just yet. Instead, I plan to provide a replacement set of API's that decouples navigations and window opening entirely.

Changed in oxide:
importance: Undecided → Medium
status: New → Triaged
Changed in oxide:
milestone: none → branch-1.11
Chris Coulson (chrisccoulson) wrote :

RendererPreferences::browser_handles_non_local_top_level_requests got removed in!/, making this urgent

Changed in oxide:
importance: Medium → Critical
assignee: nobody → Chris Coulson (chrisccoulson)
Changed in oxide:
status: Triaged → In Progress
Changed in oxide:
status: In Progress → Fix Released
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