Here is the link of authentication google content api - https://developers.google.com/shopping-content/guides/how-tos/authorizing
If you only want access token you can do - tokenResponse.getAccessToken(), It is working for 1 hr and you have to set clientId,clientSecret, redirectUri,and Scope.
object Authentication extends App {
import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport
import com.google.api.client.http.HttpTransport
import com.google.api.client.json.JsonFactory
import com.google.api.client.json.jackson2.JacksonFactory
val httpTransport: HttpTransport = GoogleNetHttpTransport.newTrustedTransport
val jsonFactory: JsonFactory = JacksonFactory.getDefaultInstance
import com.google.api.client.googleapis.auth.oauth2.GoogleClientSecrets.Details
val details = new Details
details.setClientId("")
details.setClientSecret("")
val redirectUrl = ""
val scope = ""
import com.google.api.client.googleapis.auth.oauth2.GoogleClientSecrets
val clientSecrets = new GoogleClientSecrets
clientSecrets.setInstalled(details)
val authorizationFlow: GoogleAuthorizationCodeFlow = new GoogleAuthorizationCodeFlow.Builder(
httpTransport,
jsonFactory,
clientSecrets,
Lists.newArrayList(scope)
).setAccessType("offline")
.build()
val authorizeUrl: String = authorizationFlow.newAuthorizationUrl.setRedirectUri(redirectUrl).build
System.out.println("Paste this url in your browser:
" + authorizeUrl + "&prompt=login" + '
')
import java.io.BufferedReader
import java.io.InputStreamReader
System.out.println("Type the code you received here: ")
val authorizationCode: String = new BufferedReader(new InputStreamReader(System.in)).readLine
import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeTokenRequest
import com.google.api.client.googleapis.auth.oauth2.GoogleTokenResponse
// Authorize the OAuth2 token.// Authorize the OAuth2 token.
val tokenRequest: GoogleAuthorizationCodeTokenRequest =
authorizationFlow.newTokenRequest(authorizationCode)
tokenRequest.setRedirectUri(redirectUrl)
println(s"token Request - $tokenRequest")
val tokenResponse: GoogleTokenResponse = tokenRequest.execute()
println(s"token response - $tokenResponse")
// Create the OAuth2 credential.
val credential: GoogleCredential = new GoogleCredential.Builder()
.setTransport(new NetHttpTransport())
.setJsonFactory(new JacksonFactory())
.setClientSecrets(clientSecrets)
.build()
// Set authorized credentials.
credential.setFromTokenResponse(tokenResponse)
val service: ShoppingContent = new ShoppingContent.Builder(httpTransport, jsonFactory, credential)
.setApplicationName("")
.build()
}
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