[harshavardhana]

A policy cannot condition access on a bucket's tags: aws:ResourceTag/<key> and
s3:BucketTag/<key> are refused as invalid condition key, so a classification
set once on a bucket cannot gate reads of it (miniohq/aistor#7456, needed by
Fabric governance).

• Add aws:ResourceTag/<key> and s3:BucketTag/<key>. Every S3 action takes
  both, because every S3 request acts on a bucket; AWS reads them from the
  bucket's tags on general purpose buckets, for bucket and object actions.
  S3 Tables actions do not take them.
• s3:PutBucketTagging takes aws:RequestTag/<key> and aws:TagKeys, so a
  policy can deny writes of governed bucket tag keys while others stay writable,
  as feat(policy): add aws:TagKeys and aws:RequestTag for table and warehouse tag writes #282 does for table and warehouse tags.

The server fills the values; the AIStor change follows this PR.

Summary by CodeRabbit

• New Features
  • Access policies can now use aws:ResourceTag and s3:BucketTag conditions to control access based on tags on a bucket or object.
  • Bucket-tagging permissions now support conditions based on requested tag values and tag keys, allowing policies to restrict which tags can be added or changed.
  • These conditions are supported for applicable S3 actions and bucket policies.

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Reviewing files that changed from the base of the PR and between 7378faf and df81fec.

📒 Files selected for processing: 2

• policy/action.go
• policy/bucket_tag_condition_test.go

📝 Walkthrough

The policy package now supports aws:ResourceTag and s3:BucketTag condition keys. Action lookup includes these keys, and PutBucketTagging supports request-tag and tag-key conditions. Tests cover authorization outcomes, condition parsing, and variable-key use.

Changes: Bucket-tag policy conditions

Layer / File(s)	Summary
Condition-key definitions and variable support policy/condition/keyname.go, policy/condition_variable_test.go	Adds AWSResourceTag and S3BucketTag as supported condition keys with tag-name suffixes. Adds variable-key test cases for resource, bucket, and request tags.
Action lookup and authorization tests policy/action.go, policy/bucket_tag_condition_test.go	Adds bucket-tag keys to action lookup and request-tag keys to PutBucketTaggingAction. Tests authorization outcomes and condition parsing for supported S3 actions and policies.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~12 minutes

Change: Feature

Merge Risk: 🔵 Low · up to 7378f

Bucket-tag conditions are accepted on the bucket-listing action, where no bucket tag value exists. A policy using them would be saved but would not grant listing. This is a minor policy-authoring problem and can be fixed or accepted before merge.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 4 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: adding aws:ResourceTag and s3:BucketTag condition keys for bucket tag conditions.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

• Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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_{A rabbit checks the tags at dawn
On buckets, keys, and objects drawn
The policy tests each path with care
Allowed or denied, the rules are clear
Then hops away through fields of green}

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Actionable comments posted: 1

---

• 🪄 Fix comments: Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at @policy/action.go:
- Line 401: Guard the bucketTagKeys merge in Lookup so ListAllMyBucketsAction,
which has no target bucket, does not include bucket-tag keys in ckeysMerged;
preserve the merge for actions that target a bucket.

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📥 Commits

Reviewing files that changed from the base of the PR and between 9408efd and 7378faf.

📒 Files selected for processing: 4

• policy/action.go
• policy/bucket_tag_condition_test.go
• policy/condition/keyname.go
• policy/condition_variable_test.go

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