fix(dgw): adopt recording file-type helpers

[Krista House (kristahouse)]

Follow-up changes requested during review of #1857.

Centralize recording extension handling in streaming through RecordingFileType so validation, stream routing, and terminal input selection are derived from one mapping.

Define explicit MIME mappings for WebM, TRP, Asciicast, and SLOG artifacts, and declare PullRecordingFile response media types in source annotations so generated OpenAPI output remains aligned and stable.

Issue: DGW-406

Co-authored-by: Copilot App 223556219+Copilot@users.noreply.github.com

[github-actions]

Let maintainers know that an action is required on their side

• Add the label release-required Please cut a new release (Devolutions Gateway, Devolutions Agent, Jetsocat, PowerShell module) when you request a maintainer to cut a new release (Devolutions Gateway, Devolutions Agent, Jetsocat, PowerShell module)

• Add the label release-blocker Follow-up is required before cutting a new release if a follow-up is required before cutting a new release

• Add the label publish-required Please publish libraries (`Devolutions.Gateway.Utils`, OpenAPI clients, etc) when you request a maintainer to publish libraries (Devolutions.Gateway.Utils, OpenAPI clients, etc.)

• Add the label publish-blocker Follow-up is required before publishing libraries if a follow-up is required before publishing libraries

[Krista House (kristahouse)]

Implementation notes:

• Refactored streaming file classification to use RecordingFileType::from_extension once, then map to streaming behavior in one place.
• Collapsed terminal input selection into the same streaming decision path, removing duplicated file-type branching.
• Completed recording MIME mapping for all RecordingFileType variants (webm, cast, rp, slog).
• Updated PullRecordingFile utoipa response media types at source so generated gateway-api.yaml stays aligned after regeneration.

Testing:

• cargo +nightly fmt --all
• cargo clippy -p devolutions-gateway --tests -- -D warnings
• Focused tests for streaming/type mapping and pull MIME behavior.
• Manual smoke validation completed on debug build for .slog, .webm, and .cast playback/pull paths.

Breaking changes:

• None.

Note

Human-tuned, LLM-assisted content.

[Copilot]

Pull request overview

Centralizes recording file-type handling and aligns download MIME types with the OpenAPI contract.

Changes:

• Adds MIME mappings for all recording formats.
• Routes streaming by RecordingFileType.
• Documents recording response media types and adds tests.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
devolutions-gateway/src/token.rs	Defines centralized recording MIME mappings.
devolutions-gateway/src/streaming.rs	Derives streaming mode and terminal input type from recording type.
devolutions-gateway/src/api/jrec.rs	Applies MIME mappings to downloads and OpenAPI annotations.
devolutions-gateway/openapi/gateway-api.yaml	Adds generated response media types.

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[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.

[Benoît Cortier (CBenoit)]

Thank you!

Could you also add a streaming.intent.md file along the streaming.rs module and write some human-vetted invariants about the concrete invariants and intentions you encoded when authoring this PR?