Question

亲爱的

我限制了firebase的存储，以仅允许经过身份验证的用户从firebae控制台读取写入内容，我的所有项目请求均正常工作，除了PDF文件的下载页面，怀疑我没有以正确的方式添加身份验证侦听器，请检查在下面为我的下载适配器和下载活动找到代码：-

//下载活动///

package com.example.boc;

import android.content.Intent;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;

import android.util.Log;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.firestore.DocumentSnapshot;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.firestore.QuerySnapshot;

import java.util.ArrayList;
import java.util.Objects;

public class pdfDownloader extends AppCompatActivity {
    FirebaseFirestore db;
    FirebaseAuth mAuth;
    FirebaseAuth.AuthStateListener mAuthListner;
    FirebaseUser mUser;
    RecyclerView mRecyclerView;
    ArrayList<DownModel> downModelArrayList = new ArrayList<>();
    MyPdfAdapter myAdapter;
    public static final String TAG="LOGIN";



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_pdf_downloader);
        mAuth = FirebaseAuth.getInstance();
        mUser = FirebaseAuth.getInstance().getCurrentUser();
        mAuthListner = new FirebaseAuth.AuthStateListener() {
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                if (mUser != null) {
                    dataFromFirebase();
                }
                else
                {
                    Log.d(TAG,"AuthStateChanged:Logout");
                }

            }
        };


        setUpRV();
        setUpFB();
        dataFromFirebase();
    }
// allowing users to see the links ////
    protected void onStart() {
        super.onStart();
        if (mUser == null) {
            dataFromFirebase();
        }
        else
        {
            Log.d(TAG,"AuthStateChanged:Logout");
        }

    }


    private void dataFromFirebase() {
        if(downModelArrayList.size()>0)
            downModelArrayList.clear();


        db.collection("files")
                .get()
                .addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
                    @Override
                    public void onComplete(@NonNull Task<QuerySnapshot> task) {
                        for(DocumentSnapshot documentSnapshot: Objects.requireNonNull( task.getResult() )) {

                            DownModel downModel= new DownModel(documentSnapshot.getString("name"),
                                    documentSnapshot.getString("link"));
                            downModelArrayList.add(downModel);

                        }

                        myAdapter= new MyPdfAdapter(pdfDownloader.this,downModelArrayList);
                        mRecyclerView.setAdapter(myAdapter);
                    }
                })

                .addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        Toast.makeText(pdfDownloader.this, "Error ;-.-;", Toast.LENGTH_SHORT).show();
                    }
                })
        ;


    }

    private void setUpFB(){
        db=FirebaseFirestore.getInstance();
    }

    private void setUpRV(){
        mRecyclerView= findViewById(R.id.recycle);
        mRecyclerView.setHasFixedSize(true);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
    }



}

////下载适配器///

package com.example.boc;

import android.app.DownloadManager;
import android.content.Context;
import android.net.Uri;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.firestore.FirebaseFirestore;

import java.util.ArrayList;

import static android.os.Environment.DIRECTORY_DOWNLOADS;

public class MyPdfAdapter extends RecyclerView.Adapter<MyViewHolder> {

    pdfDownloader pdfDownloader;
    ArrayList<DownModel> downModels;
    FirebaseFirestore db;


    public MyPdfAdapter(pdfDownloader pdfDownloader , ArrayList<DownModel> downModels) {
        this.pdfDownloader = pdfDownloader;
        this.downModels = downModels;
    }

    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {

        LayoutInflater layoutInflater = LayoutInflater.from(pdfDownloader.getBaseContext());
        View view = layoutInflater.inflate(R.layout.elements, null, false);

        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull final MyViewHolder myViewHolder, final int i) {

        myViewHolder.mName.setText(downModels.get(i).getName());
        myViewHolder.mLink.setText(downModels.get(i).getLink());
        myViewHolder.deletePdfBtn.setOnClickListener( new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                deletepdf(  );
            }
        } );

        myViewHolder.mDownload.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                downloadFile(myViewHolder.mName.getContext(),downModels.get(i).getName(),".pdf",DIRECTORY_DOWNLOADS,downModels.get(i).getLink());
            }
        });


    }


    private void deletepdf() {

        db.collection( "files" ).document()
                .delete()
                .addOnSuccessListener( new OnSuccessListener<Void>() {
                    @Override
                    public void onSuccess(Void aVoid) {

                    }
                } );

    }

    public void downloadFile(Context context, String fileName, String fileExtension, String destinationDirectory, String url) {

        DownloadManager downloadmanager = (DownloadManager) context.
                getSystemService(Context.DOWNLOAD_SERVICE);
        Uri uri = Uri.parse(url);
        DownloadManager.Request request = new DownloadManager.Request(uri);

        request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
        request.setDestinationInExternalFilesDir(context, destinationDirectory, fileName + fileExtension);

        downloadmanager.enqueue(request);
    }


    @Override
    public int getItemCount() {
        return downModels.size();
    }
}

Answer 1

rules_version = '2';
service firebase.storage {
  match /b/{bucket}/o {
    match /{allPaths=**} {
      allow read, write: if request.auth != null;    }
  }
}

这解决了我的疑问

允许Firebase存储经过身份验证的用户下载文件的代码

1 个答案: