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fix(rtdb): Apply fake credentials when getting rules for rtdb emulator#3028

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amalej wants to merge2 commits intofirebase:main
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@amalej
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Hey there! So you want to contribute to a Firebase SDK?
Before you file this pull request, please read these guidelines:

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  • If this has been discussed in an issue, make sure to link to the issue here.
    If not, go file an issue about thisbefore creating a pull request to discuss.

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  • Make sure all existing tests in the repository pass after your change.
  • If you fixed a bug or added a feature, add a new test to cover your code.

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    can discuss it together.

Fixes#2034

Running the ff code:

import{initializeApp,cert}from"firebase-admin/app";import{getDatabase}from"firebase-admin/database";process.env.FIREBASE_DATABASE_EMULATOR_HOST="127.0.0.1:9000";constadmin=initializeApp({projectId:"demo-project",databaseURL:"http://127.0.0.1:9000/?ns=demo-project-default-rtdb",});constrtdb=getDatabase(admin);asyncfunctionmain(){construles=awaitrtdb.getRules();console.log(rules);}main();

Outputs

>node .{  "rules": {    ".read": true, // Message from rules json    ".write": false  }}

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Summary of Changes

Hello@amalej, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves an issue where fetching Realtime Database rules (rtdb.getRules()) would fail when connected to the Firebase emulator due to missing authentication. It introduces a specialized HTTP client that automatically provides a fake 'owner' token when an emulator host is detected, enabling seamless rule retrieval in local development environments.

Highlights

  • Emulator Compatibility: TheDatabaseRulesClient now correctly interacts with the Realtime Database emulator by applying a fake 'owner' credential when theFIREBASE_DATABASE_EMULATOR_HOST environment variable is detected.
  • New HTTP Client for Rules: A newDatabaseRulesHttpClient class has been introduced, extendingAuthorizedHttpClient, to specifically handle the authentication logic for fetching database rules, especially in emulator environments.
  • Conditional Token Provisioning: ThegetToken() method inDatabaseRulesHttpClient is overridden to conditionally return a hardcoded 'owner' token when running against an emulator, bypassing the need for actual credentials in development.
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Code Review

This pull request addresses an issue with getting Realtime Database rules when using the emulator. The fix involves creating a newDatabaseRulesHttpClient which provides a hardcoded 'owner' token when the database emulator is detected. The changes are logical and well-targeted. My review includes a suggestion to encapsulate the magic string 'owner' as a constant within the new class to improve code clarity and maintainability.

Comment on lines +319 to +327
classDatabaseRulesHttpClientextendsAuthorizedHttpClient{
protectedgetToken():Promise<string>{
constemulatorHost=process.env.FIREBASE_DATABASE_EMULATOR_HOST;
if(emulatorHost){
returnPromise.resolve('owner');
}
returnsuper.getToken();
}
}

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medium

To improve readability and maintainability, it's a good practice to avoid magic strings. Consider defining'owner' as a private static constant within the class.

classDatabaseRulesHttpClientextendsAuthorizedHttpClient{privatestaticreadonlyEMULATOR_AUTH_TOKEN='owner';protectedgetToken():Promise<string>{constemulatorHost=process.env.FIREBASE_DATABASE_EMULATOR_HOST;if(emulatorHost){returnPromise.resolve(DatabaseRulesHttpClient.EMULATOR_AUTH_TOKEN);}returnsuper.getToken();}}

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Authentication error when usingdatabase with emulators

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@amalej

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