Im trying to access the certificate/signature from inside an android app, so that I can do something with the certificate.
I googled a bit and found the code below:
Class c = getClass();
ProtectionDomain pd = c.getProtectionDomain();
CodeSource cs = pd.getCodeSource();
Certificate[] signingCertificates = cs.getCertificates();
String st = signingCertificates[0].toString();
but c.getProtectionDomain() returns null.
anyone can help? many thanks.
Take a look at Android sources:
frameworks/base/core/java/android/content/pm/PakcageParser.java
frameworks/base/core/java/android/content/pm/Signature.java
You can perform the same on your app's own .apk.
Related
Making app in Unity.
App works perfectly in Unity editor:
can access firebase for user login - this isnt the issue
can read and write from/to google sheet located in google drive using service account
When I build to android (apk file), and install on physical andoid device (Samsung S20 phone):
can access firebase for user login - so it is not an network/internet problem
CANT read/write from google sheet.
A portion of my code is here:
Authorisation - i am not sure if this bit works on the phone, or how to check.
public void Auth() // authorise access to the googlesheet online
{
//jsonKey = File.ReadAllText("Assets/Resources/Creds/beerhats-db-3***.json"); // location of key - read it - save to string
TextAsset txtAsset = (TextAsset)Resources.Load("beerhats-db-3***", typeof(TextAsset)); //i changed the file name here on stackoverflow just in case its a security thing
string jsonKey = txtAsset.text;
ServiceAccountCredential.Initializer initializer = new ServiceAccountCredential.Initializer(Secrets.serviceAccountID);
var jsonData = (JObject)JsonConvert.DeserializeObject(jsonKey);
if (jsonData != null) // the json file isnt moving or changing - so probably dont need an if statemet - remove later
{
string privateKey = jsonData["private_key"].Value<string>(); // specifically get the private key from all the data in the json file
ServiceAccountCredential credential = new ServiceAccountCredential(initializer.FromPrivateKey(privateKey));
service = new SheetsService(new BaseClientService.Initializer()
{
HttpClientInitializer = credential,
});
}
}
Part of my ReadFile code:
public async Task<string> ReadFile(string sheetName, string cellLocation) // for reading data only
{
// creates a string of location to write to
string whereToRead = sheetName + "!" + cellLocation;
SpreadsheetsResource.ValuesResource.GetRequest request = service.Spreadsheets.Values.Get(Secrets.spreadsheetID, whereToRead);
StringBuilder sb = new StringBuilder();
ValueRange response = await request.ExecuteAsync(); // run this on a separate thread as it takes long?
IList<IList<object>> values = response.Values;
On the phone, it executes the stringbuilder line, but not the executeasync() line.
Tried:
upgrade Unity version
change the min and target API levels
introduced keystore and project keys
introduced async incase it was a loading issue
change custom gradle template checkboxes
change read access on android sdk
update nuget installs of google apis
asking chatgpt for help
looking at various forums for similar issues
I am not running on an emulator, so no help with errors during run time. No errors in editor when built.
Expecting:
when installed on android device, the app to read/write from google sheet located in google drive
Requesting:
ideas to try to get this working! Thankyou :)
I'm building an app with the Entity Framework on Xamarin that lets me compare some data. But when I start my "fetchdata" function, I receive the Error:
System.Data.SqlClient.SqlException (0x80131904): Snix_Connect (provider: SNI_PN7, error: 35 - SNI_ERROR_35)Snix_Connect (provider: SNI_PN7, error: 35 - SNI_ERROR_35)
I see many posts about Xamarin / Android & that it is not possible to get a connection to a SQL Server. Is there any way to fetch data from a SQL Server with .NET Core on Xamarin?
This is the string I put into SQL_Class folder with Sql_Common.cs
Fill up the brace brackets with actual parameters (removing the brace brakets too).
public static string SQL_connection_string = #"data source={server_address};initial catalog={database_name};user id={user_id};password={password};Connect Timeout={seconds}";
Then I access whenever I need it from any xamarin code just like we use in our asp.net c#
This works for me on my app without any issues.
using (SqlConnection Sql_Connection = new SqlConnection(Sql_Common.saralEHR_connection_string))
But as #Jason mentioned in his first reply, I too would get once again check the security part. I fexperienced before publishing Package to Google Play, they encrypt the App files with Hash Key Code and then only it gets upload to server
Yes it is possible (HuurrAYY!):
Im new in .net core, c# and so on and for me it was a hell of a work to get it working..
So here for the other noobs who are seeking for Help:
Guide´s i used:
Building Android Apps with Entity Framework
https://medium.com/#yostane/data-persistence-in-xamarin-using-entity-framework-core-e3a58bdee9d1
https://blog.xamarin.com/building-android-apps-entity-framework/
Scaffolding
https://cmatskas.com/scaffolding-dbcontext-and-models-with-entityframework-core-2-0-and-the-cli/
How i did it:
Build your normal Xamarin app.
create new .net solution like in the tutorials (DONT WRITE YOUR Entity Framework CLASSES)
create a third solution what has to be a .net core console application
Scaffold your DB in your CONSOLE application move all created classes & folders in your "xamarin .net" solution & change the namespaces
Ready to Go!
Side Node: NuGets you need in every solution:
Microsoft.EntityFrameworkCore
Microsoft.EntityFrameworkCore.SqlServer
[EDIT: NuGets you need in every solution]
I am doing this way (working snippet):
string connectionString = #"data source={server};initial catalog={database};user id={user};password={password};Connect Timeout=10";
string databaseTable = "{table name}";
string selectQuery = String.Format("SELECT count(*) as Orders FROM {0}", databaseTable);
try
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
//open connection
connection.Open();
SqlCommand command = new SqlCommand(selectQuery, connection);
command.Connection = connection;
command.CommandText = selectQuery;
var result = command.ExecuteScalar().ToString();
//check if there is result
if(result != null)
{
OrdersLabel.Text = result;
}
}
}
catch (Exception ex)
{
OrdersLabel.Text = ex.Message;
}
It is working fine, but API call more elegant.
I hope it helps.
I'm trying to authenticate an end-user in an android app written in C# (Xamarin.Android).
I decided to try and use NuGet package Google.Apis.Oauth.v2 which seems to expose an easy to use Oauth client.
LocalServerCodeReceiver.ReceiveCodeAsync throws the following:
I get System.NotSupportedException:"Failed to launch browser with https://XXX.auth.XXX.amazoncognito.com/login?response_type=token&client_id=XXX&redirect_uri=https%3A%2F%2Fwww.google.com&scope=profile%20openid%20email for authorization. See inner exception for details."
and it has an inner exception of System.ComponentModel.Win32Exception:"Cannot find the specified file"
Code:
var clientSecret = new Google.Apis.Auth.OAuth2.ClientSecrets();
clientSecret.ClientId = ...
clientSecret.ClientSecret = ...
var initializer = new Google.Apis.Auth.OAuth2.Flows.AuthorizationCodeFlow.Initializer(
"https://XXX.auth.XXX.amazoncognito.com/login",
"https://XXX.auth.XXX.amazoncognito.com/login");
initializer.Scopes = new List<string> {"profile", "openid", "email"};
initializer.ClientSecrets = clientSecret;
var flow = new Google.Apis.Auth.OAuth2.Flows.AuthorizationCodeFlow(initializer);
var authCodeRequestURL = flow.CreateAuthorizationCodeRequest("https://www.google.com");
authCodeRequestURL.ResponseType = "token";
var uri = authCodeRequestURL.Build();
var cancellationTokenSource = new System.Threading.CancellationTokenSource();
var codeReceiver = new Google.Apis.Auth.OAuth2.LocalServerCodeReceiver();
var task = codeReceiver.ReceiveCodeAsync(authCodeRequestURL, cancellationTokenSource.Token);
Do I need to ask for a specific permission in the application manifest?
Instead of redirecting to www.google.com, I've heard you can redirect to an app, I'm not really sure how to do that, is it http://my_app_package_name or http://my_app_title, something else?
Is it possible not to rely on that library for launching the browser and instead get the RequestUri and start an Activity, if so how will the app become aware the end-user completed the SignIn process and how will the app retrieve the token?
Sorry, but Google.Apis.Oauth.v2 does not support Xamarin, and there's no simple way to get it working.
Unfortunately no Google.Apis.* packages currently support Xamarin.
You might find the Xamarin.Auth package does what you want?
I've figured out how to redirect to an app after authentication in the browser completes.
It's called a "Deep Link" and it's documented at enter link description here, essentially you need to declare an IntentFilter on your Activity, which registers with the Android OS that if someone clicks or an page redirects to a specific URI, your app gets called. The token that's appended to the URI can then be read inside your app.
I have been trying a ( i hope) simple bit of Android hyperloop code directly within a titanium project (using SDK 7.0.1.GA and hyperloop 3).
var sysProp = require('android.os.SystemProperties');
var serialNumber = sysProp.get("sys.serialnumber", "none");
But when the app is run it reports
Requested module not found:android.os.SystemProperties
I think this maybe due to the fact that when compiling the app (using the cli) it reports
hyperloop:generateSources: Skipping Hyperloop wrapper generation, no usage found ...
I have similar code in a jar and if I use this then it does work, so I am wondering why the hyperloop generation is not being triggered, as I assume that is the issue.
Sorry should have explained better.
This is the jar source that I use, the extraction of the serial number was just an example (I need access to other info manufacturer specific data as well), I wanted to see if I could replicate the JAR functionality using just hyperloop rather that including the JAR file. Guess if it's not broke don't fix it, but was curious to see if it could be done.
So with the feedback from #miga and a bit of trial and error, I have come up with a solution that works really well and will do the method reflection that is required. My new Hyperloop function is
function getData(data){
var result = false;
var Class = require("java.lang.Class");
var String = require("java.lang.String");
var c = Class.forName("android.os.SystemProperties");
var get = c.getMethod("get", String.class, String.class);
result = get.invoke(c, data, "Error");
return result;
}
Where data is a string of the system property I want.
I am using it to extract and match a serial number from a Samsung device that is a System Property call "ril.serialnumber" or "sys.serialnumber". Now I can use the above function to do what I was using the JAR file for. Just thought I'd share in case anyone else needed something similar.
It is because android.os.SystemProperties is not class you can import. Check the android documentation at https://developer.android.com/reference/android/os/package-summary.html
You could use
var build = require('android.os.Build');
console.log(build.SERIAL);
to access the serial number.
I am using Google Spreadsheet API in my simple Android application. This is the piece of code:
URL spreadSheetUrl = new URL("https://spreadsheets.google.com/feeds/spreadsheets/private/full");
SpreadsheetQuery query = new SpreadsheetQuery(spreadSheetUrl);
query.setTitleQuery("xyz");
query.setTitleExact(true);
SpreadsheetFeed spreadSheetFeed = service.getFeed(query, SpreadsheetFeed.class);
This piece of code is called from my application's sync adapter.
I am getting this error:
com.google.gdata.util.ParseException: Unrecognized content type:application/binary
com.google.gdata.client.Service.parseResponseData(Service.java:2136)
com.google.gdata.client.Service.parseResponseData(Service.java:2098)
com.google.gdata.client.Service.getFeed(Service.java:1136)
com.google.gdata.client.Service.getFeed(Service.java:1077)
com.google.gdata.client.GoogleService.getFeed(GoogleService.java:676)
com.google.gdata.client.Service.getFeed(Service.java:1034)
Can someone suggest how I can solve this issue?
It turns out that I did not set the user credentials before executing this piece of code.
service.setUserCredentials(user, password);
Adding this line helped solve this issue. Weird.