feat: add utility for asset canister

[viviveevee]

Feat

• ic-http-certification: add HttpCertification::response_only_prehashed for creating certifications from pre-computed hashes
• ic-http-certification: add HttpCertificationTree::as_hash_tree for serializing the full certification tree
• ic-http-certification: add response_hash_from_headers for computing response hashes from pre-built header pairs
• ic-http-certification: add build_v2_certificate_header_value for building the IC-Certificate header value as a String
• ic-http-certification: add cbor_encode_to_base64 utility for encoding values as base64(CBOR)
• ic-http-certification: make RESPONSE_STATUS_PSEUDO_HEADER_NAME public

Adds small utility functions that the asset canister needs to get rid of a bunch of code

[Copilot]

Pull request overview

This PR adds lower-level utilities and constructors in ic-http-certification to let the asset canister build/serialize certification artifacts (header values, full trees, and certifications) without duplicating hashing and header-building logic.

Changes:

• Add utilities to CBOR-encode + base64-encode values and to build the v2 IC-Certificate header value as a String.
• Add HttpCertificationTree::as_hash_tree and HttpCertification::response_only_prehashed for serialization and prehashed construction.
• Add response_hash_from_headers plus expose RESPONSE_STATUS_PSEUDO_HEADER_NAME; minor cleanups and example updates; update changelog.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
packages/ic-http-certification/src/utils/response_header.rs	Adds base64(CBOR) helper and a function to build the v2 certificate header value string.
packages/ic-http-certification/src/tree/certification_tree.rs	Adds as_hash_tree() to expose the full labeled HashTree.
packages/ic-http-certification/src/tree/certification.rs	Adds response_only_prehashed() constructor for precomputed hashes.
packages/ic-http-certification/src/lib.rs	Tweaks lint allow attributes for test-only rstest_reuse import.
packages/ic-http-certification/src/hash/response_hash.rs	Makes status pseudo-header constant public and adds response_hash_from_headers().
packages/ic-certification-testing-wasm/src/certificate_builder.rs	Small iterator cleanup using a function pointer in map.
examples/certification/certified-counter/src/backend/src/lib.rs	Updates thread-local initialization; changes certified data setter call; improves error formatting.
CHANGELOG.md	Adds Unreleased entries for the new ic-http-certification APIs.

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[Copilot]

Pull request overview

Adds new ic-http-certification utilities intended to simplify asset-canister integration by allowing pre-hashed certification construction and easier serialization of certification structures.

Changes:

• Add HttpCertification::response_only_prehashed to build response-only certifications from precomputed hashes.
• Add HttpCertificationTree::as_hash_tree to expose the full labeled tree for serialization (e.g., CBOR).
• Add helper utilities for building/encoding the v2 IC-Certificate header value and computing response hashes from pre-built header pairs; update examples to newer ic-cdk APIs.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
packages/ic-http-certification/src/utils/response_header.rs	Adds base64(CBOR) helper and a function to build the v2 IC-Certificate header value string.
packages/ic-http-certification/src/tree/certification_tree.rs	Adds as_hash_tree() returning the full labeled HashTree + test coverage.
packages/ic-http-certification/src/tree/certification.rs	Adds response_only_prehashed() + test ensuring it matches response_only().
packages/ic-http-certification/src/lib.rs	Relaxes test-only linting to avoid unused import warnings for rstest_reuse.
packages/ic-http-certification/src/hash/response_hash.rs	Exposes the status pseudo-header constant and adds response_hash_from_headers() + test.
packages/ic-certification-testing-wasm/src/certificate_builder.rs	Minor iterator simplification for wasm-bindgen deserialization mapping.
examples/http-certification/skip-certification/src/backend/src/lib.rs	Updates to certified_data_set and canister_cycle_balance usage.
examples/http-certification/json-api/src/backend/src/lib.rs	Updates to certified_data_set.
examples/http-certification/custom-assets/src/backend/src/lib.rs	Updates to certified_data_set and canister_cycle_balance usage.
examples/http-certification/assets/src/backend/src/lib.rs	Updates to certified_data_set, canister_cycle_balance, and formatting style.
examples/certification/certified-counter/src/backend/src/lib.rs	Updates to certified_data_set and formatting style.
CHANGELOG.md	Adds Unreleased entries for selected new APIs.

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[Copilot]

Pull request overview

Adds lower-level utilities in ic-http-certification to help asset-canister-style consumers reuse precomputed hashes and serialize full certification trees, reducing duplicated logic in downstream canisters.

Changes:

• Added new public helpers for building IC-Certificate header values and encoding CBOR-to-base64.
• Added APIs to (a) construct response-only certifications from precomputed hashes and (b) serialize the full certification tree as a HashTree.
• Added a lower-level response-hash function operating on pre-built (String, Value) header pairs; updated examples and changelog accordingly.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
packages/ic-http-certification/src/utils/response_header.rs	Adds cbor_encode_to_base64 and build_v2_certificate_header_value utilities.
packages/ic-http-certification/src/tree/certification_tree.rs	Adds HttpCertificationTree::as_hash_tree + test ensuring http_expr label wrapping.
packages/ic-http-certification/src/tree/certification.rs	Adds HttpCertification::response_only_prehashed + test equating it to response_only.
packages/ic-http-certification/src/hash/response_hash.rs	Makes status pseudo-header constant public; adds response_hash_from_headers + test.
packages/ic-http-certification/src/lib.rs	Adjusts clippy allow list for test-only rstest_reuse import.
packages/ic-certification-testing-wasm/src/certificate_builder.rs	Minor iterator/map simplification for wasm bindgen decoding.
examples/http-certification/skip-certification/src/backend/src/lib.rs	Updates to newer ic_cdk::api names and cycle balance function.
examples/http-certification/json-api/src/backend/src/lib.rs	Updates to certified_data_set API name.
examples/http-certification/custom-assets/src/backend/src/lib.rs	Updates to newer ic_cdk::api names and cycle balance function.
examples/http-certification/assets/src/backend/src/lib.rs	Updates to newer ic_cdk::api names, cycle balance function, and formatting.
examples/certification/certified-counter/src/backend/src/lib.rs	Updates to certified_data_set and minor formatting improvements.
CHANGELOG.md	Adds “Unreleased” entries documenting the new APIs/utilities.

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