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        before being able to upvote. Upvoting indicates when questions and answers are useful. (https://stackoverflow.com/help/whats-reputation) What's reputation and how do I get it?  To start gaining reputation, try answering a related question. curl oauth-2.0 google-cloud-platform google-oauth      Find related question Not now           (https://cdn.sstatic.net/Sites/stackoverflow/Img/apple-touch-icon.png?v=c78bd457575a) (https://stackoverflow.com/questions/53357741/how-to-perform-oauth-2-0-using-the-curl-cli) How to perform OAuth 2.0 using the Curl CLI?  (https://stackoverflow.com/questions/ask) Ask Question     (2018-11-18 03:53:33Z) Asked 6 years, 5 months ago  Modified (https://stackoverflow.com/questions/53357741/how-to-perform-oauth-2-0-using-the-curl-cli?lastactivity) (2020-03-20 20:44:34Z) 5 years, 1 month ago  (Viewed 94,732 times) Viewed 95k times    Part of (https://stackoverflow.com/collectives/google-cloud) Google Cloud Collective       This question shows research effort; it is useful and clear 40  (This question does not show any research effort; it is unclear or not useful)         Save this question. (https://stackoverflow.com/posts/53357741/timeline)    Show activity on this post.   I would like to use curl from a Windows command prompt to perform Google OAuth 2.0. My goal is to better understand the authentication flows that an OAuth server implements, see the HTTP headers, etc. How can this be done using curl.exe from a Windows Command Prompt?  (https://stackoverflow.com/collectives/google-cloud)  Google Cloud Collective (https://stackoverflow.com/questions/tagged/curl) (show questions tagged 'curl') curl  (https://stackoverflow.com/questions/tagged/oauth-2.0) (show questions tagged 'oauth-2.0') oauth-2.0  (https://stackoverflow.com/questions/tagged/google-cloud-platform) (show questions tagged 'google-cloud-platform') google-cloud-platform  (https://stackoverflow.com/questions/tagged/google-oauth) (show questions tagged 'google-oauth') google-oauth      (https://stackoverflow.com/q/53357741) (Short permalink to this question) Share   (https://stackoverflow.com/posts/53357741/edit) Improve this question  Follow  Follow this question to receive notifications      asked (2018-11-18 03:53:33Z) Nov 18, 2018 at 3:53   (https://stackoverflow.com/users/8016720/john-hanley) (John Hanley's user avatar)    (https://stackoverflow.com/users/8016720/john-hanley) John Hanley John Hanley (reputation score 81,560) 81.6k (7 gold badges)  7  7 gold badges (113 silver badges)  113  113 silver badges (179 bronze badges)  179  179 bronze badges          (Use comments to ask for more information or suggest improvements. Avoid answering questions in comments.) Add a comment |  (Expand to show all comments on this post)        1 Answer 1   Sorted by:  (https://stackoverflow.com/questions/53357741/how-to-perform-oauth-2-0-using-the-curl-cli?answertab=scoredesc#tab-top) Reset to default   (scoredesc) Highest score (default)  (trending) Trending (recent votes count more)  (modifieddesc) Date modified (newest first)  (createdasc) Date created (oldest first)            This answer is useful 34  (This answer is not useful)         Save this answer. (Loading when this answer was accepted…)     (https://stackoverflow.com/posts/53357742/timeline)    Show activity on this post.    How to perform OAuth 2.0 using the Curl CLI?  This answer is for Windows Command Prompt users but should be easily adaptable to Linux and Mac also. You will need your Google Client ID and Client Secret . These can be obtained from the Google Console under APIs & Services -> Credentials . In the following example, the Scope is cloud-platform . Modify to use the scopes that you want to test with. Here are a few scopes that you can test with: "https://www.googleapis.com/auth/cloud-platform"
"https://www.googleapis.com/auth/cloud-platform.read-only"
"https://www.googleapis.com/auth/devstorage.full_control"
"https://www.googleapis.com/auth/devstorage.read_write"
"https://www.googleapis.com/auth/devstorage.read_only"
"https://www.googleapis.com/auth/bigquery"
"https://www.googleapis.com/auth/datastore"   (https://developers.google.com/identity/protocols/googlescopes) OAuth 2.0 Scopes for Google APIs  Details:  Copy the following statements to a Windows batch file. Modify to fit your environment. Modify the script for the browser that you want to use. Run the batch file. A browser will be launched. The browser will go to (https://accounts.google.com/) https://accounts.google.com where you can complete the Google OAuth 2.0 authentication. Once complete a code will be displayed in the browser window. Copy this code (control-c) from the browser window and paste into the command prompt window (control-rightclick). The script will complete the OAuth 2.0 code exchange for a Token. The Token will be displayed in the command prompt. The returned Token contains an Access Token that can be used in more curl commands.  Windows Batch Script: set CLIENT_ID=Replace_with_your_Client_ID
set CLIENT_SECRET=Replace_with_your_Client_Secret
set SCOPE=https://www.googleapis.com/auth/cloud-platform
set ENDPOINT=https://accounts.google.com/o/oauth2/v2/auth

set URL="%ENDPOINT%?client_id=%CLIENT_ID%&response_type=code&scope=%SCOPE%&access_type=offline&redirect_uri=urn:ietf:wg:oauth:2.0:oob"

@REM start iexplore %URL%
@REM start microsoft-edge:%URL%
start chrome %URL%

set /p AUTH_CODE="Enter Code displayed in browser: "

curl ^
--data client_id=%CLIENT_ID% ^
--data client_secret=%CLIENT_SECRET% ^
--data code=%AUTH_CODE% ^
--data redirect_uri=urn:ietf:wg:oauth:2.0:oob ^
--data grant_type=authorization_code ^
https://www.googleapis.com/oauth2/v4/token   The final output looks like this: {
  "access_token": "ya29.deleted_for_security_reasons",
  "expires_in": 3600,
  "refresh_token": "1/jk3/deleted_for_security_reasons",
  "scope": "https://www.googleapis.com/auth/cloud-platform",
  "token_type": "Bearer"
}   Example curl command using Access Token: set ACCESS_TOKEN=replace_with_your_access_token
set PROJECT=development-123456
set ZONE=us-west-1a
set INSTANCE_NAME=dev-system

@REM - This endpoint will start the instance named INSTANCE_NAME in ZONE
set ENDPOINT=https://www.googleapis.com/compute/v1/projects/%PROJECT%/zones/%ZONE%/instances/%INSTANCE_NAM%/start

curl -H "Authorization: Bearer %ACCESS_TOKEN" "%ENDPOINT%"   Tip: Save the Access Token to a file Modify the last line of the batch script to use jq to process the output: curl ^
--data client_id=%CLIENT_ID% ^
--data client_secret=%CLIENT_SECRET% ^
--data code=%AUTH_CODE% ^
--data redirect_uri=urn:ietf:wg:oauth:2.0:oob ^
--data grant_type=authorization_code ^
https://www.googleapis.com/oauth2/v4/token | jq -r ".access_token > token.save

set /p ACCESS_TOKEN=<token.save
echo %ACCESS_TOKEN%   The last two lines show how to read the Access Token that was saved to a file for further use in more scripts. Remember, Tokens expire after 60 minutes which is the default value. I wrote an article detailing this on my blog: (https://www.jhanley.com/google-oauth-2-0-testing-with-curl/) Google OAuth 2.0 – Testing with Curl  [Update 3/18/2020]  I write an article on how to perform OAuth in Powershell. This article shows how to do OAuth, save and refresh tokens and then impersonate a service account. (https://www.jhanley.com/powershell-impersonate-google-service-account/) PowerShell – Impersonate Google Service Account    (https://stackoverflow.com/a/53357742) (Short permalink to this answer) Share   (https://stackoverflow.com/posts/53357742/edit) Improve this answer  Follow  Follow this answer to receive notifications      (https://stackoverflow.com/posts/53357742/revisions) (show all edits to this post) edited (2020-03-19 04:06:13Z) Mar 19, 2020 at 4:06         answered (2018-11-18 03:53:33Z) Nov 18, 2018 at 3:53   (https://stackoverflow.com/users/8016720/john-hanley) (John Hanley's user avatar)    (https://stackoverflow.com/users/8016720/john-hanley) John Hanley John Hanley (reputation score 81,560) 81.6k (7 gold badges)  7  7 gold badges (113 silver badges)  113  113 silver badges (179 bronze badges)  179  179 bronze badges        7   Request:  would you post an example of sending a cURL smtp message with OAuth2 though gmail? – (https://stackoverflow.com/users/9713817/todd) (976 reputation) Todd  Commented (2020-03-19 01:57:08Z, License: CC BY-SA 4.0) Mar 19, 2020 at 1:57        @Todd - Create a new question and let me know the link. – (https://stackoverflow.com/users/8016720/john-hanley) (81,560 reputation) John Hanley  Commented (2020-03-19 04:02:50Z, License: CC BY-SA 4.0) Mar 19, 2020 at 4:02        Hi John, to answer the question you posed to me, I have created (https://stackoverflow.com/questions/60736238/how-do-i-send-email-with-curl-gmail-and-oauth2) (how do i send email with curl gmail and oauth2) stackoverflow.com/questions/60736238/…  – (https://stackoverflow.com/users/9713817/todd) (976 reputation) Todd  Commented (2020-03-20 22:34:47Z, License: CC BY-SA 4.0) Mar 20, 2020 at 22:34        @JohnHanley is there any way to get the code displayed in the browser automatically without entering it manually? – (https://stackoverflow.com/users/5920411/s-ouchene) (1,879 reputation) s.ouchene  Commented (2021-09-19 17:19:12Z, License: CC BY-SA 4.0) Sep 19, 2021 at 17:19   (this comment was edited 1 time)          @s.ouchene - On my website are articles about how to use OAuth with curl. I also provide a mini webserver in Python to handle code exchanges. The source is also on GitHub: (https://github.com/jhanley-com/google-oauth-2-0-testing-with-curl) github.com/jhanley-com/google-oauth-2-0-testing-with-curl  – (https://stackoverflow.com/users/8016720/john-hanley) (81,560 reputation) John Hanley  Commented (2021-09-19 17:34:30Z, License: CC BY-SA 4.0) Sep 19, 2021 at 17:34        (Use comments to ask for more information or suggest improvements. 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