java - Authenticating Google Drive API in server side without prompting users to log in -


so here situation.i designing website,where people can create profile.the profile image created uploaded in google drive , later shared using google drive api.i trying authenticate using oauth 2.0 authentication. each time,it prompts log in users(client side) , profile image gets uploaded in google drive. need 1 time,or rather open authentication users can directly upload pictures in drive..

my code in server side goes this...

package com.gamesquad.uploads;  ..//imports done;  public class googledriveservices { private static logger log = logger.getlogger(googledriveservices.class); static httptransport httptransport = new nethttptransport();     static jsonfactory jsonfactory = new jacksonfactory(); static properties connectionprop = new properties(); private static googleauthorizationcodeflow flow=null;  public static void initiparameteres(){     try {            connectionprop.load(thread.currentthread().getcontextclassloader().getresourceasstream("connection.properties"));     } catch (ioexception e) {         // todo auto-generated catch block         e.printstacktrace();     } }  //1.get authorization url  public static string authorize(){     flow= new googleauthorizationcodeflow.builder(httptransport, jsonfactory,connectionprop.getproperty("googleappclientid"),connectionprop.getproperty("googleappclientsecret"),arrays.aslist(drivescopes.drive)).setaccesstype("online").setapprovalprompt("auto").build();     string url = flow.newauthorizationurl().setredirecturi(connectionprop.getproperty("googleappredirecturi")).build();     return url; } //2.get authenticated client public static drive createauthorizedclient(string code) throws ioexception{     googletokenresponse response = flow.newtokenrequest(code).setredirecturi(connectionprop.getproperty("googleappredirecturi")).execute();     googlecredential credential = new googlecredential().setfromtokenresponse(response);     drive service = new drive.builder(httptransport, jsonfactory, credential).build();     return service; } //3.upload file public static string uploadnewfileingoogledrive(java.io.file inputfile,drive service) throws ioexception,malformedurlexception {     //insert file       string mimetype="image/"+inputfile.getname().substring(inputfile.getname().lastindexof(".") + 1, inputfile.getname().length());     file body = new file();     body.settitle("profilepic_"+system.currenttimemillis());     body.setdescription("profile picture");     body.setmimetype(mimetype);     body.setshared(true);     java.io.file filecontent = new java.io.file(inputfile.getabsolutepath());     filecontent mediacontent = new filecontent(mimetype, filecontent);     file file = service.files().insert(body, mediacontent).execute();     //file uploaded     //share file     permission permission = new permission();     permission.setvalue("");     permission.settype("anyone");     permission.setrole("reader");     property newproperty = new property();     newproperty.setvisibility("public");     try {         service.permissions().insert(file.getid(), permission).execute();         service.properties().insert(file.getid(), newproperty).execute();     } catch (exception e) {          log.error("an error occurred: " + e);     }     //file shared     log.info("file id: " + file.getid());     return file.getid();   } }

you need use service account. see https://developers.google.com/accounts/docs/oauth2serviceaccount.

from page says "the requesting application has prove own identity gain access api, , end-user doesn't have involved."


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