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Published 6 days ago • verified publisherbdaya-dev.com
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iOS and macOS implementation of the oidc plugin

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oidc_darwin #

The iOS and macOS ("darwin") implementation of the oidc plugin.

This is an endorsed federated implementation of oidc — you don't use it directly. Add oidc to your app and this package is pulled in automatically on iOS and macOS.

It merges and supersedes the former oidc_ios and oidc_macos packages into a single Flutter sharedDarwinSource plugin: one platform-guarded Swift source, one Package.swift, and one podspec serve both Apple platforms.

What it does #

All OIDC logic (URL building, PKCE, state, nonce, response parsing) lives in pure-Dart oidc_core. This package only opens the authorization / end-session URL in an ASWebAuthenticationSession and returns the captured redirect URI back to Dart. The Dart↔native transport is the Pigeon-generated OidcAppleHostApi plus an event channel for browser observability events.

  • iOS 13+ / macOS 10.15+
  • Swift Package Manager and CocoaPods are both supported.
  • iOS 17.4+ / macOS 14.4+ additionally support https (Universal-Link) callbacks and additionalHeaderFields.

macOS: external-browser (loopback) navigation mode #

By default both platforms run the flow inside an in-app ASWebAuthenticationSession. On macOS only, you can opt into running the flow in the user's default system browser instead, capturing the redirect on an RFC 8252 §7.3 loopback interface — the same transport oidc_desktop uses on Windows/Linux. This is useful when you want the login to happen in the user's real browser (shared session cookies, password managers, extensions) rather than the isolated ASWebAuthenticationSession web view.

Enable it via OidcPlatformSpecificOptions.macos:

const OidcPlatformSpecificOptions(
  macos: OidcNativeOptionsApple(
    navigationMode: OidcAppleNavigationMode.loopbackSystemBrowser,
    // Optional: bound the wait so an abandoned flow does not hang forever.
    flowTimeoutSeconds: 300,
    // Optional: HTML shown in the browser tab after a successful redirect.
    successfulPageResponse: '<html><body>You may return to the app.</body></html>',
  ),
)

When this mode is selected on macOS:

  • The authorization URL is opened in the default browser via url_launcher.
  • A loopback HTTP listener binds http://127.0.0.1:{port}. Use a redirect_uri of http://127.0.0.1:0 to bind an ephemeral free port — the actual port is written back into the redirect_uri before the browser is launched (identical to oidc_desktop).
  • The wait for the redirect is bounded by flowTimeoutSeconds (a TimeoutException surfaces as an OidcException).

iOS ignores this setting — ASWebAuthenticationSession remains the only iOS mechanism (there is no iOS equivalent of opening the default system browser and binding a loopback interface). The .ios field's navigationMode is not consulted.

Redirect URI registration #

Register a loopback redirect URI of the form http://127.0.0.1:{port} (path optional, e.g. http://127.0.0.1:0/callback) with your OpenID Provider. Most providers that follow RFC 8252 allow any port for a 127.0.0.1 loopback redirect, so registering the literal http://127.0.0.1 (or with a fixed path) is typically sufficient even when an ephemeral port is used at runtime.

App Sandbox entitlements #

A sandboxed macOS app must be allowed to bind the loopback listener and to make the outgoing browser/HTTP connections. Add both of these to your macOS app's *.entitlements files (Runner/DebugProfile.entitlements and Runner/Release.entitlements):

<key>com.apple.security.network.server</key>
<true/>
<key>com.apple.security.network.client</key>
<true/>

network.server is required to accept the inbound loopback redirect; network.client is required to reach the OpenID Provider. Without them the App Sandbox blocks the loopback socket and the flow cannot complete.

Note: the exact entitlement requirement for binding a 127.0.0.1 listener under the macOS App Sandbox has not been re-verified on-device for this release; confirm against your target macOS version if you ship a sandboxed build.

Migrating from oidc_ios / oidc_macos #

Apps depending on the oidc umbrella need no changes. If you depended on oidc_ios or oidc_macos directly, depend on oidc_darwin instead (or just on oidc). The OidcPlatformSpecificOptions.ios and .macos option fields are unchanged — each platform still reads its own field.

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iOS and macOS implementation of the oidc plugin

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Topics

#oidc #openidconnect #oauth #authentication

License

MIT (license)

Dependencies

flutter, oidc_core, oidc_loopback_listener, oidc_platform_interface, url_launcher

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