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Match exact PostHog ingestion origin for UI routing #514

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Merged
0thernet merged 1 commit into from
Oct 1, 2026
Merged

Match exact PostHog ingestion origin for UI routing #514

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12 changes: 12 additions & 0 deletions website/analytics.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -95,6 +95,18 @@ describe("ghostget.com analytics contract", () => {
expect(capture?.properties).toMatchObject({ analytics_schema_version: 2, site_id: "ghostget" });
});

test("selects the EU UI only for the exact validated ingestion origin", () => {
expect(createBrowserConfig("https://eu.i.posthog.com", home).ui_host).toBe("https://eu.posthog.com");
for (const host of [
"https://us.i.posthog.com",
"https://eu.i.posthog.com.attacker.example",
"https://attacker.example/eu.i.posthog.com",
"https://attacker.example/?host=eu.i.posthog.com",
]) {
expect(createBrowserConfig(host, home).ui_host).toBe("https://us.posthog.com");
}
});

test("keeps the cookieless, personless, bundled-SDK configuration", () => {
const config = createBrowserConfig("https://us.i.posthog.com", home);
expect(config).toMatchObject({
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2 changes: 1 addition & 1 deletion website/source/analytics-contract.ts
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Expand Up @@ -508,7 +508,7 @@ export function createBrowserConfig(host: string, evidence: BrowserEvidence, isA
respect_dnt: true,
// Do not retain a batch that could outlive a visitor’s consent.
request_batching: false,
ui_host: host.includes("eu.i.posthog.com") ? "https://eu.posthog.com" : "https://us.posthog.com",
ui_host: host === "https://eu.i.posthog.com" ? "https://eu.posthog.com" : "https://us.posthog.com",
};
}

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