feat(cli): reuse login when minting access tokens

[defangdevs]

Summary

• in non-interactive mode, reuse a cached, unexpired OpenAuth login assertion when minting a workspace-scoped access token
• add --save to persist the minted token as the current Defang credential without printing it
• retain the browser flow for interactive use, expired logins, and fixed-workspace defang_... access tokens

This gives Station a minimal one-login flow: log in, list/select a workspace, then mint and save a long-lived token for that workspace. Fabric remains responsible for validating the assertion and workspace membership.

Example:

defang token --workspace "$workspace" --scope admin --expires 8760h --save --non-interactive

Verification

• go test -short ./pkg/auth ./pkg/cli ./cmd/cli/command
• make build
• targeted golangci-lint for changed command/auth code
• git diff --check

The full test suite was also run in the Nix development shell. Changed packages pass. Two existing host-sensitive tests fail on this agent box: the AWS credential test discovers instance credentials, and the compose permission test runs with a DAC capability that bypasses mode 000.

The required repo-wide make lint was run. It reports 20 pre-existing, unrelated gosec findings; targeted lint for the changed code is clean.

Summary by CodeRabbit

• New Features
  • The token command can save a generated token as the current credential with --save instead of displaying it.
  • In non-interactive mode, token generation can reuse an existing OpenAuth login. If the stored token cannot be reused, browser authentication is used instead.
  • Saving is unavailable when DEFANG_ACCESS_TOKEN is set.
• Bug Fixes
  • Errors during token generation or credential saving are now reported by the command.

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📥 Commits

Reviewing files that changed from the base of the PR and between 8b8e1a0 and 4508bf1.

📒 Files selected for processing (5)

• src/cmd/cli/command/commands.go
• src/cmd/cli/command/token.go
• src/cmd/cli/command/token_test.go
• src/pkg/auth/client.go
• src/pkg/auth/client_test.go

💤 Files with no reviewable changes (1)

• src/cmd/cli/command/commands.go

🚧 Files skipped from review as they are similar to previous changes (2)

• src/pkg/auth/client_test.go
• src/pkg/auth/client.go

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📝 Walkthrough

Walkthrough

The token command adds a --save option and can reuse an existing OpenAuth token as an assertion. The token-generation function accepts an optional assertion and returns the generated token instead of printing it.

Changes

Scoped token command

Layer / File(s)	Summary
Return scoped tokens src/pkg/cli/token.go, src/pkg/cli/token_test.go	Token accepts an optional assertion, sends it in the Fabric request, and returns the generated access token. Tests cover request fields and error propagation.
Recognize OpenAuth tokens src/pkg/auth/client.go, src/pkg/auth/client_test.go	IsOpenAuthAccessToken parses token claims without verifying the signature. It checks the configured issuer and expiry. Tests cover matching and non-matching tokens.
Wire token reuse and saving src/cmd/cli/command/commands.go, src/cmd/cli/command/commands_test.go, src/cmd/cli/command/token.go, src/cmd/cli/command/token_test.go	The command adds --save. In non-interactive mode, it can use a stored OpenAuth token as an assertion. It saves the generated token when requested and prints it otherwise. Tests cover the request, saved token, and absence of the token from stdout.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant User
  participant tokenCmd
  participant IsOpenAuthAccessToken
  participant cli.Token
  participant FabricService
  User->>tokenCmd: Run token command
  tokenCmd->>IsOpenAuthAccessToken: Classify stored token when non-interactive
  IsOpenAuthAccessToken-->>tokenCmd: Return token classification
  tokenCmd->>cli.Token: Request scoped token with optional assertion
  cli.Token->>FabricService: Send token request
  FabricService-->>cli.Token: Return access token
  cli.Token-->>tokenCmd: Return access token
  tokenCmd-->>User: Save token or print token

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Merge Risk: ⚪ Minimal · up to 4508b

Cached-login token generation and saving have no established merge-blocking issue. The supported invocation uses --non-interactive, not --reuse-login.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 22.22% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 9 functions across 8 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: reusing a login when minting access tokens.

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✨ Finishing Touches 💡 1

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Actionable comments posted: 1

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Inline comments:
Review comments at @src/cmd/cli/command/token.go:
- Around line 27-42: Update auth.IsOpenAuthAccessToken to return false for
tokens whose expiration time has passed, while continuing to accept tokens with
no expiration claim. This lets the existing empty-assertion path in the
reuseLogin flow trigger browser authentication for expired cached tokens.

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ℹ️ Review info

⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Essentials
• Run ID: 21f5ffb9-b3ed-4f80-928f-25d1dc084fad

📥 Commits

Reviewing files that changed from the base of the PR and between 697d40e and 8b8e1a0.

📒 Files selected for processing (8)

• src/cmd/cli/command/commands.go
• src/cmd/cli/command/commands_test.go
• src/cmd/cli/command/token.go
• src/cmd/cli/command/token_test.go
• src/pkg/auth/client.go
• src/pkg/auth/client_test.go
• src/pkg/cli/token.go
• src/pkg/cli/token_test.go

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