That's great to hear José. I'm a bit new to using JWT tokens myself (having only used OAuth2 access & refresh tokens) when talking to Google APIs. One big advantage to JWT tokens is that you save API calls to both exchange a JWT for an access token as well as your case of needing to send a refresh token to get a new/valid access token. Cheers!
On Wed, Sep 2, 2020 at 1:04 AM 'José Cantera' via Google App Engine < google-appengine@googlegroups.com> wrote: > Yes, Wesley is right, in the end a refresh_token is not that necessary in > this case, it suffices with self-signing a new JWT token with the exp > timestamp updated, > > thanks! > > On Wed, Sep 2, 2020 at 3:26 AM wesley chun <wes...@gmail.com> wrote: > >> Hi, I may not be correct in my understanding but believe that refresh >> tokens are only used in cases where you're using OAuth2 access tokens for >> authorization. Since you're using a self-signed JWT instead of an access >> token >> <https://developers.google.com/identity/protocols/oauth2/service-account#jwt-auth>, >> I don't think the useful reference that David linked to applies in your >> case (and BTW, this is independent of whether you're using IAP or not). >> >> Since you're signing the JWT token, can't you simply resign it with an >> updated timestamp in your JWT payload (as shown a bit further down on the >> page I just linked to above)? (I believe that'll have the same effect of >> using a refresh token to get an updated access token.) >> >> On Tue, Sep 1, 2020 at 2:00 PM 'David (Cloud Platform Support)' via >> Google App Engine <google-appengine@googlegroups.com> wrote: >> >>> This documentation >>> <https://developers.google.com/identity/protocols/oauth2/web-server#offline> >>> about refreshing an access token (offline access) using Google's >>> authorization server could be helpful. >>> >>> On Monday, August 31, 2020 at 8:26:25 AM UTC-4 jose.c...@iota.org wrote: >>> >>>> I am using IAP to protect a Web API Application. I have enabled a >>>> service account to get access to the APIs through an id_token. I am able to >>>> obtain an id_token (JWT) by signing a JWT (using the keys of my service >>>> account) with the following assertions >>>> { >>>> "iss": "xx.iam.gserviceaccount.com", >>>> "sub": "xx.iam.gserviceaccount.com", >>>> "aud": "https://oauth2.googleapis.com/token";, >>>> "target_audience": "my_application_client_id", >>>> "iat": 1598702078, >>>> "exp": 1598705593 >>>> } >>>> >>>> and then Posting to the token service as follows >>>> curl --location --request POST 'https://oauth2.googleapis.com/token' \ >>>> --header 'Content-Type: application/x-www-form-urlencoded' \ >>>> --data-urlencode 'assertion=<JWT obtained at the previous step>’ >>>> --data-urlencode >>>> 'grant_type=urn:ietf:params:oauth:grant-type:jwt-bearer' \ >>>> --data-urlencode 'scope=openid’ >>>> >>>> Now I would like to also obtain a refresh_token and has been >>>> impossible. I have tried with *scope=openid offline_access* but no >>>> luck. Is *offline_access* implemented in the Google Auth Server? Any >>>> other mechanism to obtain a refresh_token? >>>> >>>> Thank you very much >>>> >>>> *IOTA Foundation* >>>> c/o Nextland >>>> Strassburgerstraße 55 >>>> 10405 Berlin, Germany >>>> >>>> Board of Directors: Dominik Schiener, David Sønstebø, Serguei Popov, >>>> Navin Ramachandran >>>> ID/Foundation No.: 3416/1234/2 (Foundation Register of Berlin) >>>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Google App Engine" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to google-appengine+unsubscr...@googlegroups.com. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/google-appengine/9687fedb-925a-42ef-9c26-439febdf168fn%40googlegroups.com >>> <https://groups.google.com/d/msgid/google-appengine/9687fedb-925a-42ef-9c26-439febdf168fn%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >> >> >> -- >> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - >> "A computer never does what you want... only what you tell it." >> wesley chun :: @wescpy <http://twitter.com/wescpy> :: Software >> Architect & Engineer >> Developer Advocate at Google Cloud by day; at night... >> Python training & consulting : http://CyberwebConsulting.com >> "Core Python" books : http://CorePython.com >> Python blog: http://wescpy.blogspot.com >> >> -- >> You received this message because you are subscribed to a topic in the >> Google Groups "Google App Engine" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/google-appengine/XJz5lES-TyQ/unsubscribe >> . >> To unsubscribe from this group and all its topics, send an email to >> google-appengine+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/google-appengine/CAB6eaA7w%3DYu9dOZ7ChhgE8Bf9Bb%2BjFxoMTsMbuTuHZ7dURqDrw%40mail.gmail.com >> <https://groups.google.com/d/msgid/google-appengine/CAB6eaA7w%3DYu9dOZ7ChhgE8Bf9Bb%2BjFxoMTsMbuTuHZ7dURqDrw%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> > > *IOTA Foundation* > c/o Nextland > Strassburgerstraße 55 > 10405 Berlin, Germany > > Board of Directors: Dominik Schiener, David Sønstebø, Serguei Popov, Navin > Ramachandran > ID/Foundation No.: 3416/1234/2 (Foundation Register of Berlin) > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to google-appengine+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/google-appengine/CABcrX6ibkhXhn1R0JUy16vTfoY7CXtqjeRprwNVxVqw2M1_bfA%40mail.gmail.com > <https://groups.google.com/d/msgid/google-appengine/CABcrX6ibkhXhn1R0JUy16vTfoY7CXtqjeRprwNVxVqw2M1_bfA%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "A computer never does what you want... only what you tell it." wesley chun :: @wescpy <http://twitter.com/wescpy> :: Software Architect & Engineer Developer Advocate at Google Cloud by day; at night... Python training & consulting : http://CyberwebConsulting.com "Core Python" books : http://CorePython.com Python blog: http://wescpy.blogspot.com -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-appengine+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/CAB6eaA6hLFb3fG79Fazauu%2BM4DYzCaOp%3De8n%2BG3OFoBKt-78JQ%40mail.gmail.com.
