How to remove firebase custom domain?

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• How to abort a FireStore transaction if any write operation fails?

  In the code below, I am updating two documents in a transaction. However, if only one of the update succeeds and the other one fails for whatever reason, FireStore will complete the transaction anyways. How do I abort the transaction if any of the write operations fail?

  var country; // forget to set a value to this variable
  // Create a reference to the SF doc.
  var sfDocRef = db.collection("cities").doc("SF");
  var usaDocRef = db.collection("country").doc(country);  //country is undefined  
  db.runTransaction(function(transaction) {
      return transaction.get(sfDocRef).then(function(sfDoc) {
          if (!sfDoc.exists) {
              throw "Document does not exist!";
          }
  
          var newPopulation = sfDoc.data().population + 1;
          if (newPopulation <= 1000000) {
              transaction.update(sfDocRef, { population: newPopulation }); //Will succeed
              transaction.update(usaDocRef, { lastPopulationUpdate: new Date()}); //Will fail
              return newPopulation;
          } else {
              return Promise.reject("Sorry! Population is too big.");
          }
      });
  }).then(function(newPopulation) {
      console.log("Population increased to ", newPopulation);
  }).catch(function(err) {
      // This will be an "population is too big" error.
      console.error(err);
  });
  

  In the above example, we forgot to assign a value to country .
• Firestore Security Rule to allow update nested field

  I have a document with structure

  name: "blablabla"
  members:
      123: true
      456: true
  

  Users can add themselves in members

  docRef.update(FieldPath.of("members", myUid), true);
  

  How do I write a security rule to allow this?

  ---

  I tried

  allow update: if is_valid(request.resource.data);
  function is_valid(data) {
    return data.keys() == ['members']
        && data.members.keys() == [request.auth.uid]
        && data.members[request.auth.uid] == true;
  }
  

  But I get PERMISSION_DENIED: Missing or insufficient permissions.

  (However in Security Rules Simulator access is allowed)
• Realtime Database structure for a chat app

  I am developing a chat app using Firebase Realtime DB and cloud functions. I have a problem regarding my DB's structure and how to retrieve the Chatnodes a User is part of. My DB has the below structure

  {
    "chats" : {
      "chatId1" : {
        "lastMessage" : "example of last message",
        "timestamp" : "11111"
      },
      "chatId2" : {
        "lastMessage" : "generic last message",
        "timestamp" : "22222"
      }
    },
  
    "members" : {
      "chatId1" : {
        "uid1" : true,
        "uid2" : true
      },
      "chatId2" : {
        "uid1" : true,
        "uid3" : true
      }
    },
  
    "users" : {
      "uid1" : {
        "name" : "UserName1"
      },
      "uid2" : {
        "name" : "UserName2"
      },
      "uid3" : {
        "name" : "UserName3"
      }
    }
  }
  

  For now, I have found this solution: https://stackoverflow.com/a/37579607/7403707, that suggests to add a users child node under every /chats child and perform a deep query. But after reading the docs and watching some videos, I found out that this is far from optimal as it downloads the whole tree. Another thing I have thought, is to create a separate node called /userChats, which will have the below structure:

  {
    "userChats" : {
      "uid1" : {
        "chatId1" : true,
        "chatId2" : true
      },
      "uid2" : {
        "chatId1" : true
      },
      "uid3" : {
        "chatId3" : true
      }
    }
  }
  

  and perform these actions:

  1. Fetch from /userChats all the keys (chatIds) of a specific user (e.g. user with id=uid1).
  2. Perform for every key (chatId) of the resulted snapshot another fetch, which will be another snapshot with a value of type Chat.
  3. Store all the fetched Chat objects in an Array.
  4. Pass this array to the recyclerView adapter of my app.

  What are your suggestions? I would, hopefully, like to make it work with the Firebase RecyclerView, if it is possible. Thanks.
• Can I read files from firebase hosting in a cloud function?

  I want to make a image serving api using Firebase hosting and cloud functions. I know they both run on different server, I can download the files in my function using a http request, but it does not seem practical to download a file first and then serve that image.

  Is it possible to read the resources deployed in firebase hosting, in a cloud function function?
• Node.js creates public folder on Desktop Firebase

  I want to set up a Website with Firebase. I have a folder on my Desktop with that Path C:\Users\marce\Desktop\Website. So I start the Node.js than I run cd C:\Users\marce\Desktop\Website, firebase login and then firebase init. Now I make the setup guide normally. Everything works perfectly. But all the folders are not created here C:\Users\marce\Desktop\Website. They all are created here: C:\Users\marce\Desktop
  I hope somebody knows a solution.
  Thanks in advance.
• Why does add firebase serve command some additional info to url?

  My problem is about testing my codes on localhost (ports: 5000, 5001). I'm using the command below in terminal windows:

  sudo firebase serve
  

  And it's giving the links after ready:

  hosting[helloapp]: Serving hosting files from: public
  hosting[helloapp]: Local server: http://localhost:5000
  functions: app: http://localhost:5001/helloapp/us-central1/app
  

  It seems ok. But when I try the functions some url doesn't work correctly. For example: if there is a redirect code in backend path of the url disappeared, 'helloapp/us-central1/app'. Hosting url working nice.. I dont know why the functions:app URL have some additional part?

  Backend index.js

  app.use('/', express.static(path.join(__dirname, '../public'))); 
  app.set('view engine', 'ejs'); 
  app.set('views', path.join(__dirname, './app_server/views')); 
  

  Redirect code:

  catch(error => {
    console.log('cant access', error);
    res.redirect('/login');
  }    
  

  The Problem

  The URL before redirect:

  http://localhost:5001/helloapp/us-central1/app
  

  The URL after redirect:

  http://localhost:5001/login
  

  The URL, I expect

  http://localhost:5001/helloapp/us-central1/app/login
  
• How to map sub domain to custom domain in apache

  I am creating an application in a LAMP stack and I want to provide the user with the ability to use their own domain instead of a subdomain of my site. eg.

  Instead of: http://seaspa.prouses.com

  They will use: http://www.seaspa.com

  I know there are a few companies that provide this using CNAME records. Like : shopify, blogger.com, wordpress.com

  My questions are:

  What is this process called? (So I can research this further if need be)

  What do I need to do to provide this? ie. What do I need to do on the DNS, apache and php side to get this working?

  Any advice, links or code snippets would be greatly appreciated.

  Thanks
• Godaddy Custom Domain | Firebase Website | Site can't be reached

  I have purchased a domain from Godaddy let's say myCustomDomainName.com

  I have created a project and deployed a web page in FireBase - https://home-myCustomDomainName.firebaseapp.com/

  I have linked a custom domain in the project console

  In GoDaddy the A records and TXT Records are also updated.

  The site was up for a while. I could access my website using https://myCustomDomainName.com as well as https://www.myCustomDomainName.com

  But now I keep getting Site can't be reached error. [I am however able to reach the site through firebase URL https://home-myCustomDomainName.firebaseapp.com/] []3

  Even ping requests fail.

  Please advice on what could be wrong and how to avoid this error.
• Use CNAME record to show other site's content

  I want to enable my site users to use custom domain for their profiles. For e.g. the user can be found on this address: https://example.org/u/user and the user can link his domain to it, so his domain https://user.org would show the content of https://example.org/u/user.

  I figured out that this can be done with a CNAME record. But when I try this, create a free domain (.TK, .ML, etc.), set it up on CloudFlare and add a CNAME record, pointing to my site (https://example.org) (the index page would get the domain that displays it's content, searches for it in the database and gets the user that has linked this domain to his profile and than display his profile), it just redirects me to this link: http://user.org/cgi-sys/defaultwebpage.cgi.

  Do I have to set something up in the hosting to get this work? Or am I wrong?