So I have created a login that will take an username and password input from the user, encode it with Base64 in order to create a token in the format: ("Authorization", AUTH) where AUTH = "Basic " + Base64 encoding of user and password. This is sent via Headers.
So, in the end, it looks like this: Authorization: Basic XXXXXX, where XXXXXX is the user token.
And then it will check whether or not that user exists in the database via an API request.
I am using Retrofit and OkHttp3 in the same class as RetrofitClient and this class is responsible for using the API and adding those Headers.
Later, I use the RetrofitClient class on the Login Activity.
What I need to do now, is make this "token" available to all the other activities by creating a Singleton that will store the data of the Retrofit after a successful login. But I do not know how to do this.
I started learning Kotlin and Android 3 weeks ago.
Here is my code:
GET_LOGIN.kt
interface GET_LOGIN {
#GET("login")
fun getAccessToken() : Call<String>
}
RetrofitClient.kt
class RetrofitClient {
fun login(username:String, password:String){
val credentials = username + ":" + password
val AUTH = "Basic " + Base64.encodeToString(credentials.toByteArray(Charsets.UTF_8), Base64.DEFAULT).trim()
retrofit = init(AUTH)
}
// Initializing Retrofit
fun init(AUTH: String) : Retrofit{
// Creating the instance of an Interceptor
val logging = HttpLoggingInterceptor()
logging.level = HttpLoggingInterceptor.Level.BODY
// Creating the OkHttp Builder
val client = OkHttpClient().newBuilder()
// Creating the custom Interceptor with Headers
val interceptor = Interceptor { chain ->
val request = chain?.request()?.newBuilder()?.addHeader("Authorization", AUTH)?.build()
chain?.proceed(request)
}
client.addInterceptor(interceptor) // Attaching the Interceptor
//client.addInterceptor(logging) // Attaching the Interceptor
// Creating the instance of a Builder
val retrofit = Retrofit.Builder()
.baseUrl("https://srodki.herokuapp.com/") // The API server
.client(client.build()) // Adding Http Client
.addConverterFactory(GsonConverterFactory.create()) // Object Converter
.build()
return retrofit
}
lateinit var retrofit : Retrofit
fun providesGetLogin(): GET_LOGIN = retrofit.create(GET_LOGIN::class.java)
}
LoginActivity.kt
var RetrofitClient : RetrofitClient = RetrofitClient()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_login)
loginBtn.setOnClickListener {
val user = userTxt.text.toString()
val pass = passTxt.text.toString()
if (validateLogin(user, pass)){
login(user, pass)
}
}
}
fun validateLogin(user: String, pass: String): Boolean {
if (user == null || user.trim().isEmpty()){
Toast.makeText(this, "Missing Username or Password", Toast.LENGTH_SHORT).show()
return false
}
if (pass == null || pass.trim().isEmpty()){
Toast.makeText(this, "Missing Username or Password", Toast.LENGTH_SHORT).show()
return false
}
return true
}
fun login(user: String, pass: String) {
RetrofitClient.login(user, pass)
val apiLogin = RetrofitClient.providesGetLogin().getAccessToken()
apiLogin.enqueue(object : Callback<LoginResponse> {
override fun onResponse(call: Call<LoginResponse>, response: Response<LoginResponse>) {
if(response.isSuccessful){
if(response.body()?.code == 0){
Toast.makeText(this#LoginActivity, "Login Successful!", Toast.LENGTH_SHORT).show()
val intent = Intent(this#LoginActivity, List_usersActivity::class.java)
startActivity(intent)
} else {
Toast.makeText(this#LoginActivity, "Login Failed.", Toast.LENGTH_SHORT).show()
}
}
}
override fun onFailure(call: Call<LoginResponse>, t: Throwable) {
Toast.makeText(this#LoginActivity, "Login Failed.", Toast.LENGTH_SHORT).show()
}
})
}
}
first and foremost, please use camel case on java and kotlin. We have standards in java and kotlin on programming. And i can see that you are trying to do DI, but, thats not how you do it in Android.
Anyways, you could do this a couple of ways without even using a singleton but by saving it on a storage. Options are Shared Preferences, Local Storage and SQLite. But, if you insist on using a singleton. You can do it like this:
object MySingleton { // This is how you declare singletons in kotlin
lateinit var token: String;
}
EDIT
So, from your comment, it looked like you need to store the token. You could start by using sharedpreferences(database would be better) and store the token there. I assume you don't know how to so here is an example:
val sp = SharedPreferences("sp", 0);
sp.edit().putString("token", theTokenVariable); // not sure of this function
sp.edit().apply(); // you could use commit if you dont mind sharedpreferences to lag your screen(if it ever will)
Now how do you get the token from retrofit? The only way i could help you right now is that you could retrieve the response body from the response variable you receive from onResponse of the retrofit call. From there it is your problem mate. I don't know how your response is formatted, how it should be retrieved etc. A recommendation would be to format it as JSON.
Related
I am using Retrofit to send request as encrypted JWT (JWE) to an API.
My service interface is:
interface APICallService {
#Headers("Content-Type: application/jwt")
#POST("/v1/api/dp_checkkyc")
fun getKycCompliantStatus(#Header("Authorization") accessToken:String, kycStatusRequest: KycStatusRequest): Call<KycCompliantBaseResponse>
}
My KycStatusRequest class is:
data class KycStatusRequest(var encryptedJWT : String)
I am hitting the API with:
fun getEKycCompliantStatus(accessToken:String, pan:String) {
var jwe = EncryptedJWTGenerator(pan).jweString //This JWE works fine with Postman
val kycStatusRequest = KycStatusRequest(jwe)
val call = getServiceInstance().getKycCompliantStatus("Bearer ${accessToken.trim()}", kycStatusRequest)
call.enqueue(object : Callback<KycCompliantBaseResponse> {
override fun onResponse(call: Call<KycCompliantBaseResponse>, response: Response<KycCompliantBaseResponse>) {
if (response.code() == 200) {
val kycResponse = response.body()!!
if (kycResponse.Response.F_PAN_STATUS.equals("ok", true))
isKycCompliant = true
else if (kycResponse.Response.F_PAN_STATUS.equals("invalid", true))
isKycCompliant = false
}
else
Toast.makeText(context,"Check kyc API failure!", Toast.LENGTH_LONG).show()
}
override fun onFailure(call: Call<KycCompliantBaseResponse>, t: Throwable) {
Toast.makeText(context,"Check kyc API failure!", Toast.LENGTH_LONG).show()
}
})
}
On using the above code I get 'Internal Server Error'.
But on using the same jwe I used above with postman, API works fine.
I am suspecting that I am getting this error as I am wrapping my JWE in KycStatusRequest class before sending, which I think will convert it into a JSON with key-value pair.
How do I send my JWE as a raw text without any key-value pair?
Solved by wrapping up my JWE with RequestBody class as:
val requestBody: RequestBody = RequestBody.create(MediaType.parse("text/plain"), jwe)
I think you'll need to add a converter Factory to your retrofit builder, like this one:
private val retrofit = Retrofit.Builder()
.baseUrl(BASE_URL)
.client(client)
.addConverterFactory(GsonConverterFactory.create()) //Converters can be added to support other types in body
.build()
You can learn more about converterfactory and retrofit on its website: https://square.github.io/retrofit/
I am sending my token as Authorization in Retrofit but I always get a 401 code. But if I use the same token in Postman, I can get access. I know I am able to access the webapi because I can Login just fine and able to get the token from the Web Api. Please see my code below:
ApiService Interface
#POST("consolidated/sample")
fun sample(#Header("Authorization") token: String): Call<ResponseBody>
Calling the Service
private fun pushTransactionsToWebApi() {
val vApiService = ApiServiceBuillder.buildService(ApiService::class.java)
CoroutineScope(Main).launch {
var token = SharedDataManager.getInstance(context!!).applicationToken
var tokenArr = token!!.split(':')
responseFromApi = tokenArr[1] ==> I use this so I can remove the word "token" at the beginning of the token string
token = "Bearer ${responseFromApi}"
Log.i("TAG", "${token}") ==> ####
val call = vApiService.sample(token)
if(!call.isExecuted) {
call.enqueue(object : Callback<ResponseBody>{
override fun onFailure(call: Call<ResponseBody>, t: Throwable) {
responseFromApi = t.message
}
override fun onResponse(
call: Call<ResponseBody>,
response: Response<ResponseBody>
) {
if(response.isSuccessful){
Toast.makeText(context, "We are OK", Toast.LENGTH_LONG).show()
} else {
progressDialog!!.dismiss()
Toast.makeText(context, "We are NOT OK", Toast.LENGTH_LONG).show()
}
}
})
}
}
}
### => Result in my Log.i()
2020-04-08 13:03:09.235 14185-14185/com.kotlin.ambulantlcs I/TAG:
Bearer
"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.m1mZw79KLIxq4pZPmBRbN7TjILvhvbUIJOCWDEM8I-k"}
If I paste this in my Postman, I can get access
What do I need to do? Thank you!
From our conversation in the comments, it seems like you're getting a json {"token": "..."} from SharedDataManager.getInstance(context!!).applicationToken. This explains why when you split in : you get printed in the log "..."}.
There are a lot of ways to deserialize json in Android. Here are some options. I think the vanilla way is something like:
val root = JSONObject(SharedDataManager.getInstance(context!!).applicationToken)
val token = root.getString("token")
With this you'll have the token in token.
However, if you already have a json library you could use it. For example, with gson you could do something like:
data class TokenData(
#SerializedName("token")
val token: String)
val token = Gson().fromJson(
SharedDataManager.getInstance(context!!).applicationToken,
TokenData::class.java)
You can now use token.
With Moshi using the kotlin gen library - com.squareup.moshi:moshi-kotlin-codegen - you can define the above model like:
#JsonClass(generateAdapter = true)
data class TokenData(
#Json(name = "token")
val token: String)
// Then get it like:
val token = Moshi.Builder()
.build()
.adapter(TokenData::class.java)
.fromJson(SharedDataManager.getInstance(context!!).applicationToken)
These are just some options. There's also the popular Jackson. Pick the one that suits best your needs. Hope this helps
Remove " " quotes from token
make sure that keys must be same
pass token like as:
Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.m1mZw79KLIxq4pZPmBRbN7TjILvhvbUIJOCWDEM8I-k
I am developing an Android application using Kotlin. In my application, I am consuming GraphQL API using Apollo Client. What I am trying to do now is that I want to retrieve a response field of the response.
This is my code
protected fun _handleLoginButtonClick(view: View) {
val apolloClient = ApolloClient.builder()
.serverUrl("https://app.herokuapp.com/graphql")
.okHttpClient(OkHttpClient())
.build()
val loginMutation = LoginMutation.builder()
.identity(view.etf_email.text.toString())
.password(view.etf_password.text.toString())
.build()
view.tv_login_error_message.text = "Started making request"
apolloClient.mutate(loginMutation).enqueue(object: ApolloCall.Callback<LoginMutation.Data>() {
override fun onFailure(e: ApolloException) {
view.tv_login_error_message.text = e.message
}
override fun onResponse(response: Response<LoginMutation.Data>) {
//here I dont know how to retrieve a field, accessToken
}
})
}
As you can see the comment in the onResponse callback, I cannot figure out how to retrieve the accessToken field. How can I retrieve it?
OnResponse Contains response Object and it has data object from where you can get your fields.
apolloClient.mutate(loginMutation).enqueue(object: ApolloCall.Callback<LoginMutation.Data>() {
override fun onFailure(e: ApolloException) {
view.tv_login_error_message.text = e.message
}
override fun onResponse(response: Response<LoginMutation.Data>) {
//here you can use response to get your model data like accessToken
response.data.(here you can get data from your model. eg accessToken)
}
})
I am using retrofit to fetch some data and for that I am passing a token in Header for Authentication.
I want to fetch the token from the Shared Preferences in my Retrofit Client Object but I don't know how to?
I tried to get a context in the object using a function but then it gives me WARNING that
Do not place Android context classes in static fields (static reference to RetrofitClient which has field context pointing to Context); this is a memory leak (and also breaks Instant Run) less...
Also i tried to get context in my interface of retrofit and I got the context without warning but I don't know where to get Shared Preferences.
interface Api {
var context:Context;
#FormUrlEncoded
#POST("getMerchantProductsSlideContent")
fun getProductsForSlide(
//Don't know how to get value from shared refercne to this header
#Header("Authentication: Bearer ")
#Field("token") token:String,
#Field("deviceId") deviceId:String,
#Field("content_receiver") content_receiver:String,
#Field("content_type") content_type:String,
#Field("data") data:Array<String>
):Call<DefaultResponse>
fun getContext(mContext:Context){
context = mContext
}
}
This is retrofitClient.kt
object RetrofitClient {
private val AUTH = "Bearer $token"
private const val BASE_URL = "http://192.168.1.5/Projects/Sitapuriya/public/"
private val okHttpClient = OkHttpClient.Builder()
.addInterceptor { chain ->
val original = chain.request()
val requestBuilder = original.newBuilder()
.addHeader("Authorization", AUTH)
.method(original.method(), original.body())
val request = requestBuilder.build()
chain.proceed(request)
}.build()
val instance: Api by lazy{
val retrofit = Retrofit.Builder()
.baseUrl(BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.client(okHttpClient)
.build()
retrofit.create(Api::class.java)
}
}
This is my retrofit interface
interface Api {
#FormUrlEncoded
#POST("getMerchantProductsSlideContent")
fun getProductsForSlide(
#Field("token2") token2:String,
#Field("deviceId") deviceId:String,
#Field("content_receiver") content_receiver:String,
#Field("content_type") content_type:String,
#Field("data") data:Array<String>
):Call<DefaultResponse>
}
[UPDATED] This is my activity n which i am calling the retrofit
val data = arrayOf(merchantId)
RetrofitClient.instance.getContext(this)
RetrofitClient.instance.getProductsForSlide(
token,
deviceId,
"MERCHANT",
"MERCHANT_VIEW_BASIC",
data
).enqueue(object:Callback<DefaultResponse>{
override fun onFailure(call: Call<DefaultResponse>, t: Throwable) {
Toast.makeText(applicationContext,"ERROR: ${t.message}",Toast.LENGTH_LONG).show()
}
override fun onResponse(
call: Call<DefaultResponse>,
response: retrofit2.Response<DefaultResponse>
) {
Toast.makeText(applicationContext,"SUCCESS: ${response.body()?.content}",Toast.LENGTH_LONG).show()
}
})
I want to get the token from Shared Preferences and use it as a header for my request and I know to access Shared Preferences we need a context. How can I get the context in Object?
[UPDATE-2] Tried #Blundell answer
interface Api {
var token: String
#FormUrlEncoded
#POST("getMerchantProductsSlideContent")
fun getProductsForSlide(
#Header("Authentication: Bearer $token")
#Field("token") token:String,
#Field("deviceId") deviceId:String,
#Field("content_receiver") content_receiver:String,
#Field("content_type") content_type:String,
#Field("data") data:Array<String>
):Call<DefaultResponse>
fun setAuthHeader(token2:String){
token = token2
}
}
But it gives error: An annotation argument must be a compile-time constant
Try to get token in your activity (you can use activity's context and get token from shared preferences) and pass this token to your retrofit class.
Also try to read something about dependency injection, dagger2, koin etc to provide different dependencies to your classes
interface Api {
#FormUrlEncoded
#POST("getMerchantProductsSlideContent")
fun getProductsForSlide(
#Header("Authentication") token:String,
#Field("deviceId") deviceId:String,
#Field("content_receiver") content_receiver:String,
#Field("content_type") content_type:String,
#Field("data") data:Array<String>
):Call<DefaultResponse>
}
In your activity:
val prefToken = // get it from prefences
val token = "Bearer " + prefToken
Instead of trying to store the context in a singleton, store the header you want to send. Access the context & sharedpreferences in your Activity.
Change:
RetrofitClient.instance.getContext(this)
To something like
RetrofitClient.instance.setAuthHeader(getSharedPreferences().getString("Header"))
I've created a POST request using rxjava and retrofit that successfully hits my backend server and logs the user in (I get a 201 response in my console, all good). However, I want to then retrieve the users access token that is returned, but when I try to access the rxjava result, it just gives me the object I passed to it. Nowhere can I find out how to get the json success response. I have also verified there is in fact a response in Postman, so it's something with how I make this call.
Here is my Retrofit portion
#Headers("Content-Type: application/json")
#POST("api/v1/login")
fun loginTask(#Body credentials: UserLogin)
: Observable<UserLogin>
And the correspoinding API function
class ApiFunctions(val apiService: LunchVoteApi) {
fun provideHello(): io.reactivex.Observable<Hello> {
return apiService.helloMessage()
}
fun loginTask(email: String, password: String): io.reactivex.Observable<UserLogin> {
val credentials: UserLogin = UserLogin(email, password)
return apiService.loginTask(credentials)
}
}
The UserLogin model that is deserialized by Gson
data class UserLogin(
#SerializedName("email") val email: String,
#SerializedName("password") val password: String
)
And finally the call in my LoginActivity
val loginTask = ApiProvider.provideLoginTask()
override fun doInBackground(vararg params: Void): Boolean? {
// TODO: attempt authentication against a network service.
try {
// Simulate network access.
// Thread.sleep(2000)
compositeDisposable.add(
loginTask.loginTask(mEmail, mPassword)
.observeOn(AndroidSchedulers.mainThread())
.subscribeOn(Schedulers.io())
.subscribe ({
result ->
System.out.println(result.toString())
}, { error ->
System.out.println(error)
})
)
} catch (e: InterruptedException) {
return false
}
The confusion comes when I try to access the result -> portion of the compositeDisposable call. It just prints out the UserLogin object. Am I missing something here? Thanks.
Turns out I was returning my UserLogin type instead of a pojo object with an access token property.
Changing my retrofit call to #Headers("Content-Type: application/json")
#POST("api/v1/login")
fun loginTask(#Body credentials: UserLogin)
: Observable<AccessToken>
And creating a new model
data class AccessToken(
#SerializedName("accessToken") val email: String
)
I am now able to print out the token. Thanks to #john-oreilly