Add OAuth2 login to clickhouse-client (--login / --login=device)#1606

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BorisTyshkevich wants to merge 15 commits intoantalya-26.2from

feature/client-IdP

Commits on Apr 1, 2026

Add OAuth2 login to clickhouse-client via credentials JSON file

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Fix Google JWT exp claim type in TokenProcessorsOpaque

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Fix review blockers in OAuth2 login implementation

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Robustness fixes, issuer discovery, state CSRF, and docs

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Merge --login-device into --login=device

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Fix --login=device crash and --login=browser routing

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Fix device flow crash on Google verification_url field name

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Document --login/--oauth-credentials and add OAuth option validation tests

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DCO Remediation Commit
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Fix security and reliability issues in OAuth2 login

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Fix Google OAuth scope: use access_type=offline instead of offline_access

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Split OAuthJWTProvider into its own file; fix silent cache catch

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Add OAuth2 integration tests and fix remaining review items

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Fix blockers in Keycloak integration tests

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Fix OAuth HTTPS sessions to respect configured SSL context

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