aws: update support for additional regions

[ShelbyZ]

• add new endpoint suffixes
• use mapping between region prefix to endpoint suffix
• update flb_aws_endpoint to use new mapping
• update test_flb_aws_endpoint to test additional regions

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Testing
Before we can approve your change; please submit the following in a comment:

• [] Example configuration file for the change
• [] Debug log output from testing the change

• [] Attached Valgrind output that shows no leaks or memory corruption was found

If this is a change to packaging of containers or native binaries then please confirm it works for all targets.

• [N/A] Run local packaging test showing all targets (including any new ones) build.
• [N/A] Set ok-package-test label to test for all targets (requires maintainer to do).

Documentation

• Documentation required for this feature

Should work to expand changes merged into fluent/fluent-bit-docs#2507 to list out isolated region details.

Backporting

• [] Backport to latest stable release.

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Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

Summary by CodeRabbit

• New Features

  • Added support for additional AWS region families, including government and specialized isolated cloud domains.

• Bug Fixes

  • Improved endpoint resolution with a table-driven region→suffix mapping and a safe default.
  • Added null-parameter handling so missing inputs produce no endpoint.

• Tests

  • Expanded tests to cover new region suffixes and null-input cases.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d83bb75e-c8f7-4827-a8f9-cc54de1ddec6

📥 Commits

Reviewing files that changed from the base of the PR and between 4673da7 and a3bea06.

📒 Files selected for processing (1)

• src/aws/flb_aws_util.c

🚧 Files skipped from review as they are similar to previous changes (1)

• src/aws/flb_aws_util.c

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📝 Walkthrough

Walkthrough

Refactors AWS endpoint resolution to use a table-driven region-prefix → domain-suffix mapping, adds null-guards returning NULL for missing service/region, introduces additional non-standard suffix constants, and extends tests to cover NULL inputs and more isolated-region suffixes.

Changes

Cohort / File(s)	Summary
AWS Endpoint Resolution src/aws/flb_aws_util.c	Replaced hard-coded special-case suffix logic with a table (endpoint_suffixes) of region-prefix → domain-suffix entries (first-match via strncmp). Added new suffix constants for non-standard regions and early null-guards to return NULL when service or region is missing.
Tests: Endpoint Coverage tests/internal/aws_util.c	Updated test_flb_aws_endpoint() to assert NULL for NULL inputs, refreshed China/EU-Sovereign expectations, and added assertions for S3 endpoints in C2S, SC2S, CSP, and ADC-E isolated regions; ensured proper freeing of allocated endpoints.

Sequence Diagram(s)

(omitted)

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related PRs

• aws: switch AWS Endpoints for European Souvereign Cloud #11356 — Modifies src/aws/flb_aws_util.c endpoint suffix handling and related tests; overlaps region-suffix logic.

Suggested reviewers

• edsiper
• patrick-stephens
• sparrc
• niedbalski

Poem

🐰 I hopped through suffix rows at play,
Matched prefixes first, sent hard-cases away,
Guarded the gaps so callers rest true,
New regions lined up — a tidy view,
Hop, free, test — code done, carrot stew.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change—expanding AWS region support via new endpoint suffix mappings for isolated and non-standard regions.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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