Add MarketingStatsAPI for GET /api/marketing/stats

[Rabsztok]

Draft until GET /api/marketing/stats is live; then the VCR cassette gets re-recorded.

Motivation

Mailtrap is adding GET /api/marketing/stats: aggregated Email Marketing stats (campaigns and automations together) over a date range, the same numbers as Email Marketing > Stats Overview in the app. It is token-scoped, like the Email Campaigns endpoints, so it takes no account id. This adds it to the Ruby SDK, following the published OpenAPI contract and its Ruby code sample.

Changes

• add Mailtrap::MarketingStatsAPI.new(client).get(start_date:, end_date:, sending_domain_ids:, sources:, email_service_providers:), returning a Mailtrap::MarketingStats with the 13 counts and rates

  • dates accept a Date, Time or YYYY-MM-DD string, like StatsAPI; anything else raises ArgumentError before any request
  • every filter is optional and goes out as a repeated key[] parameter (sources[]=campaigns); one source narrows the results to campaigns or automations, none or both include both
  • a rejected filter (400), a wrong token (401) and a token without account access (403) raise the usual Mailtrap::Error / AuthorizationError / RejectionError

• StatsAPI and MarketingStatsAPI now share the date normalization and key[] query building; StatsAPI sends the same requests as before

• add examples/marketing_stats_api.rb and a README "Email marketing" entry

The VCR cassette for the recorded example is hand-written from the documented response for now. Once the endpoint is live, delete spec/fixtures/vcr_cassettes/Mailtrap_MarketingStatsAPI/ and run bin/record-vcr spec/mailtrap/marketing_stats_api_spec.rb.

How to test

You'll need an API token with at least viewer access to an account that sends campaigns or automations, and its sending domain ids.

• Totals: Mailtrap::MarketingStatsAPI.new(Mailtrap::Client.new(api_key: token)).get(start_date: Date.today - 30, end_date: Date.today) returns a Mailtrap::MarketingStats whose counts match Email Marketing > Stats Overview for the same period
• Sources: sources: ['campaigns'] and sources: ['automations'] match the Source select on that page and add up to the totals; sources: %w[campaigns automations] equals the totals
• Other filters: sending_domain_ids: [id] and email_service_providers: ['Google'] narrow the numbers like the page's domain and ESP filters
• No data: a range with no marketing traffic returns every count and rate as 0
• No account id needed: works without MAILTRAP_ACCOUNT_ID set
• Invalid input: start_date: '2026-13-01' raises ArgumentError with no request sent; sources: ['newsletters'] raises Mailtrap::Error with Invalid source: 'newsletters'
• Token scoped to a sending domain only: raises Mailtrap::RejectionError (403)
• Regression, StatsAPI: Mailtrap::StatsAPI#get and #by_domain with sending_domain_ids / sending_streams filters return the same numbers as before

Summary by CodeRabbit

• New Features
  • Added access to aggregated Email Marketing statistics, including delivery, bounce, open, click, spam, unsubscribe, and sent metrics.
  • Filter results by date range, sending domains, campaign sources, and email service providers.
  • Added a Ruby example demonstrating how to request and filter marketing statistics.
• Improvements
  • Standardized date handling and filter formatting for statistics requests.

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📥 Commits

Reviewing files that changed from the base of the PR and between e56424d and 7ace1f7.

📒 Files selected for processing: 5

• examples/marketing_stats_api.rb
• lib/mailtrap/marketing_stats.rb
• lib/mailtrap/stats_query_params.rb
• spec/mailtrap/marketing_stats_api_spec.rb
• spec/mailtrap/stats_api_spec.rb

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📝 Walkthrough

Adds a marketing statistics response type and API client. The client requests aggregated statistics for a date range with optional filters. Shared query-parameter handling is extracted for use by StatsAPI. The change also adds request tests and a Ruby example.

Changes: Marketing statistics

Layer / File(s)	Summary
Shared stats query parameters lib/mailtrap/stats_query_params.rb, lib/mailtrap/stats_api.rb, spec/mailtrap/stats_api_spec.rb	StatsQueryParams handles date normalization and array-filter serialization. StatsAPI includes the module instead of defining these methods locally. A spec covers DateTime inputs.
Marketing stats response and API lib/mailtrap/marketing_stats.rb, lib/mailtrap/marketing_stats_api.rb, lib/mailtrap.rb, spec/mailtrap/marketing_stats*, spec/fixtures/vcr_cassettes/Mailtrap_MarketingStatsAPI/*	Adds the MarketingStats metrics structure and MarketingStatsAPI#get for /api/marketing/stats. Specs cover parameter handling, response mapping, and errors.
Example and supported functionality examples/marketing_stats_api.rb, README.md	Adds an example with date-range requests and optional filters, and links to it from the supported functionality list.

Priority: ➖ Normal

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

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant Example
  participant MarketingStatsAPI
  participant MarketingStatsEndpoint
  participant MarketingStats
  Example->>MarketingStatsAPI: get date range and optional filters
  MarketingStatsAPI->>MarketingStatsEndpoint: GET /api/marketing/stats with query parameters
  MarketingStatsEndpoint-->>MarketingStatsAPI: aggregated statistics
  MarketingStatsAPI->>MarketingStats: map response data

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Merge Risk: ⚪ Minimal · up to 7ace1

The supplied evidence identifies no actionable issue blocking merge. The marketing statistics endpoint should still be checked against the live service when available.

Security architecture risk: 🔵 Low · up to 7ace1

The new client uses the existing authenticated HTTPS transport and a fixed, read-only endpoint. No client-side authorization bypass was identified. Risk remains low rather than minimal because live-service account isolation and response behavior have not yet been validated.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The intended new exposure is account-level aggregate marketing activity, including campaigns and automations when filters are omitted. Effective account and domain access depends on server enforcement of the supplied token; the inspected SDK cannot establish cross-account isolation.

Trust Boundaries and Controls

• observed — Application-controlled filters enter the remote service as URI-encoded values under keys chosen by the API methods. They do not control the marketing request path, configured host, or bearer token. This bounds the client-side input path but does not prove server-side authorization of supplied domain IDs.

Resilience and Maintainability Implications

• observed — Date validation completes before network access, and HTTP authorization failures propagate as existing exceptions rather than being converted into successful statistics. The shared helper centralizes this pre-request validation for both statistics clients.

Hardening Proposals

• proposed — Before treating the endpoint contract as validated, exercise the live service with permitted and denied tokens and with sending-domain IDs outside the token's account. Confirm isolation and denial behavior independently of the hand-written success cassette.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 28.57% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 9 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Title check		The title clearly identifies the main change: adding MarketingStatsAPI for the marketing statistics endpoint.
Description check		The description includes the required Motivation, Changes, and How to test sections with detailed implementation and validation information. The Images and GIFs section is missing, but this is non-cri…
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.

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at @examples/marketing_stats_api.rb:
- Line 10: Update both requests using marketing_stats.get to start at today - 29
instead of today - 30, keeping today as the inclusive end date so each request
covers 30 calendar dates.

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⚙️ Run configuration

• Configuration used: Repository: mailtrap/mailtrap-ruby/.coderabbit.yaml
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📥 Commits

Reviewing files that changed from the base of the PR and between 3d601b9 and e56424d.

📒 Files selected for processing (10)

• README.md
• examples/marketing_stats_api.rb
• lib/mailtrap.rb
• lib/mailtrap/marketing_stats.rb
• lib/mailtrap/marketing_stats_api.rb
• lib/mailtrap/stats_api.rb
• lib/mailtrap/stats_query_params.rb
• spec/fixtures/vcr_cassettes/Mailtrap_MarketingStatsAPI/vcr_get/maps_response_data_to_a_MarketingStats_object.yml
• spec/mailtrap/marketing_stats_api_spec.rb
• spec/mailtrap/marketing_stats_spec.rb

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