How to setup OAuth2.0 authentication for Google(GCP) account & obtain access token for Gemini APIs?

This video shows the steps to setup OAuth 2.0 authentication for Google(GCP) account to work with Gemini APIs on Desktop applications.

It uses reference from the below page:
https://ai.google.dev/gemini-api/docs/oauth?authuser=2

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Test API:

access_token=$(gcloud auth application-default print-access-token)
project_id=<MY PROJECT ID>

curl -X GET https://generativelanguage.googleapis.com/v1/models \
    -H 'Content-Type: application/json' \
    -H "Authorization: Bearer ${access_token}" \
    -H "x-goog-user-project: ${project_id}" | grep '"name"'

Sample:

curl -X GET https://generativelanguage.googleapis.com/v1/models \
    -H 'Content-Type: application/json' \
    -H "Authorization: Bearer ya29.a0AXooCgtiU4KYu7aEX0dBKywZX0t5XGjWbwEoPjI22zoq9id9Y2V_vfXgtiGOlsRtulJCzsyWlhGUdZR2tcoGU-VCnKx8I9giUCC3RhUk1_-2wgutYs7AazercDU345YG7MdKKg0AOZBB7NinD8ivxUGNnisYBFD20ZfBgaCgYKAV8SARESFQHGX2Mi0xuHC9KcOkm4bUyJlyOjWAO173" \
    -H "x-goog-user-project: apt-mark-400702" | grep '"name"'

Successfully running the test API:

Error in Test API if given wrong token:

Other Screenshots:

Make sure to use Windows PowerShell to run the gcloud command (and don’t use simple windows command prompt):

PS C:\Work\GeminiAPI> gcloud auth application-default login --client-id-file=client_secret.json --scopes='https://www.googleapis.com/auth/cloud-platform,https://www.googleapis.com/auth/generative-language.retriever'
Your browser has been opened to visit:

    https://accounts.google.com/o/oauth2/auth?response_type=code&client_id=808443943433-uh9sqecg75ai5r97krd51sqhslo228aq.apps.googleusercontent.com&redirect_uri=http%3A%2F%2Flocalhost%3A8085%2F&scope=https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fcloud-platform+https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fgenerative-language.retriever&state=4lax4dDoAC2vhPKhtRYzd7R9QPNPH6&access_type=offline&code_challenge=QlZw228wAi5bhHvY6Pma1-QiaRoDWNbWrXqF8FgxGrI&code_challenge_method=S256


Credentials saved to file: [C:\Users\abhis\AppData\Roaming\gcloud\application_default_credentials.json]

These credentials will be used by any library that requests Application Default Credentials (ADC).
PS C:\Work\GeminiAPI> gcloud auth application-default print-access-token
ya29.a0AXooCgsUmGv6y7_ePG1BfZDezsq5O0jzxhXNeTGIFmXI5bc506qgg8MNceg_jbSBHs2mzkJAcv4Lxop15EaKqbmkfBcn5oQpbQ-VyCNuUK3lfnrilspbZ7snHOzlGgE50Vu2n0Js0o13jvtN23sUOXD-I4hMpz5CJaCgYKAZUSARMSFQHGX2MihJj9iQ2wMBzlgy1MWDVrBw0171
PS C:\Work\GeminiAPI>

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