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Ignore messages other than from iframe parent #249

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Ignore messages other than from iframe parent #249

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5 changes: 5 additions & 0 deletions mitm.html
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Original file line number Diff line number Diff line change
Expand Up @@ -60,6 +60,11 @@
function onMessage (event) {
let { data, ports, origin } = event

// Ignore messages other than from iframe parent (e.g. extensions)
if (event.source !== window.parent) {
return
}

// It's important to have a messageChannel, don't want to interfere
// with other simultaneous downloads
if (!ports || !ports.length) {
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