Fiebase rules creation using c# returning System.NullReferenceException, how to fix this issue?

Question

Created the auth function for firebase rule service and called the service instance to create the firebase ruleset but it is returning System.NullReferenceException: Object reference not set to an instance of an object.What did I miss here ?

using Google.Apis.FirebaseRules.v1;
using Ruleset = Google.Apis.FirebaseRules.v1.Data.Ruleset;
using Source = Google.Apis.FirebaseRules.v1.Data.Source;
using File = Google.Apis.FirebaseRules.v1.Data.File;

private static FirebaseRulesService _firebaseRulesService;


public static void IntializeFirebaseRules() {
    GoogleCredential credential = GoogleCredential.GetApplicationDefault();
    if (CloudManager.Credential.IsCreateScopedRequired)
    {
        credential = CloudManager.Credential.CreateScoped(FirebaseRulesService.Scope.CloudPlatform);
    }
    _firebaseRulesService = new FirebaseRulesService(
    new BaseClientService.Initializer()
        {
            HttpClientInitializer = credential,
            ApplicationName = CloudManager.ApplicationName

        });
}
    

 public static async  void AddRuleset()
{
    Ruleset myRuleset = new Ruleset {
    new Source {
        Files = {
        new File {
        Name = "firestore.rules",
        Content = "service cloud.firestore {" +
        "match /databases/{database}/documents {" +
        "match /users/{userId}{" +
        "allow read: if (request.auth.uid == userId);" +
        "}" +
        "match /licenses/{accountId} {" +
        "allow read: if isAccountOwner(accountId);" +
        "}" +
        "}"+
        "}",
            }
            }
        };
    };


    _firebaseRulesService.Projects.Rulesets.Create(myRuleset , "projects/" + CloudManager.ProjectId);
}

**Edited -> separated the objects as below and the NullReferenceException occurrs on the line Source mySource = new Source

File myFile =  new File {
    Name = "firestore.rules",
    Content = "service cloud.firestore {" +
    "match /databases/{database}/documents {" +
    "match /users/{userId}{" +
    "allow read: if (request.auth.uid == userId);" +
    "}" +
    "function doc(subpath) {" +
    "return get(/databases/$(database)/documents/$(subpath)).data;" +
    "}" +
    "function isAccountOwner(accountId) {" +
    "return request.auth.uid == accountId" + 
    "|| doc(/users/$(request.auth.uid)).accountId == accountId;" +
    "}" +
    "match /licenses/{accountId} {" +
    "allow read: if isAccountOwner(accountId);" +
    "}" +
    "}"+
    "}",
};
Source mySource = new Source {
    Files = {
        myFile
    }  
};
Ruleset myRuleset = new Ruleset {
    Source = mySource
};

_firebaseRulesService.Projects.Rulesets.Create(myRuleset , "projects/" + CloudManager.ProjectId);

Does this answer your question? [What is a NullReferenceException, and how do I fix it?](https://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-and-how-do-i-fix-it) — jazb, Nov 16 '22 at 04:51
Yeah jazb, I read the answers there, but still I don't get why I am getting NullReferenceException error, I initialized all the instances and gave it a value, I will look through again. — Samaritan, Nov 16 '22 at 05:06
To isolate the issue, instead of a single statement, try separate steps: first a `new File {..}`, then a `new Source {..}` with that file, finally the `new Ruleset{..}` with that source. Don't you need a `Source=` there? — Hans Keﬆing, Nov 16 '22 at 07:42
OT you have an `async void` method. That is almost never a good idea (single exception: event handlers). But in this case just remove the `async`, you are not `await`ing anything here — Hans Keﬆing, Nov 16 '22 at 07:44
Hey Hans, I separated as you suggested, I created the new File {...} first then the new Source {...} second and finally I passed it to new Ruleset{...} and now the null exception occur on the new Source line and I also removed the async — Samaritan, Nov 16 '22 at 10:58

score 2 · Accepted Answer · answered Nov 16 '22 at 12:50

This statement:

Source mySource = new Source {
    Files = {
        myFile
    }  
};

... is trying to add myFile to the Files collection - but I suspect you'll find that's null by default. You can initialize it to a list instead:

Source mySource = new Source { Files = new List<File> { myFile } };

Fiebase rules creation using c# returning System.NullReferenceException, how to fix this issue?

1 Answers1