✨RUM-16635 Add wildcard host pattern matching to WebView event bridge

[barboraplasovska]

Motivation

Part of RUM-15826. iOS SDK counterpart DataDog/dd-sdk-ios#2963.

Changes

Adds a new optional getAllowedWebViewHostPatterns?() method to the DatadogEventBridge interface. When present, canUseEventBridge() uses wildcard pattern matching via plain string operations instead of the legacy exact + subdomain-suffix path.

Invalid patterns (more than one *) produce a display.error console warning so customers see an actionable signal. Old Browser SDK versions receiving wildcard entries from a new mobile SDK will silently ignore them (literal match fails) while plain host entries continue to bridge normally.

Test instructions

CI should pass.

Checklist

• Tested locally
• Tested on staging
• Added unit tests for this change.
• Added e2e/integration tests for this change.
• Updated documentation and/or relevant AGENTS.md file

[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[datadog-prod-us1-5]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 63.64%
• Overall Coverage: 76.68% (-0.02%)

_{This comment will be updated automatically if new data arrives.
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[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	171.78 KiB	172.11 KiB	+339 B	+0.19%	✅
Rum Profiler	7.88 KiB	7.88 KiB	0 B	0.00%	✅
Rum Recorder	21.21 KiB	21.21 KiB	0 B	0.00%	✅
Logs	54.30 KiB	54.62 KiB	+326 B	+0.59%	✅
Rum Slim	129.68 KiB	130.00 KiB	+326 B	+0.25%	✅
Worker	22.96 KiB	22.96 KiB	0 B	0.00%	✅

[barboraplasovska]

I have read the CLA Document and I hereby sign the CLA

[gogusarov]

suggestion

we currently have a couple of duplicating checks both inside some iterator and inside matchesWildcardPattern function. I suggest to combine them into one function and use early returns for readability

export function canUseEventBridge(currentHost = globalObject.location?.hostname): boolean {
    const bridge = getEventBridge()
    return bridge?.getAllowedWebViewHosts().some((entry) =>
  matchesHostEntry(currentHost, entry)) ?? false
}

export function matchesHostEntry(host: string, entry: string): boolean
  {
    if (!entry.includes('*')) {
      return host === entry || host.endsWith(`.${entry}`)
    }

    const parts = entry.split('*')
    if (parts.length !== 2) {
      display.error(`Invalid WebView host pattern "${entry}": only one
  wildcard (*) is supported.`)
      return false
    }

    const [prefix, suffix] = parts

    return host.length >= prefix.length + suffix.length &&
  host.startsWith(prefix) && host.endsWith(suffix)
}