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add a context signing helper - #81
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bpapillon merged 1 commit intoOct 30, 2026
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Adds
Schematic::ContextSignature.sign, which a customer's backend calls to sign the company and user a browser SDK sends with a publishable key, for environments that require context signatures. It returns theX-Schematic-Context-Sigvalue the JS SDK'sgetContextSignatureexpects. A signature lasts 10 minutes by default;lifetime_seconds:accepts up to the API's one-hour maximum, andissued_at:sets the start time. It matches the Go and Node helpers (SchematicHQ/schematic-go#263, SchematicHQ/schematic-node#216).The stdlib JSON generator matches the API except on U+2028 and U+2029, which the helper escapes afterwards, and it raises on invalid UTF-8, which the helper replaces with U+FFFD as the API does. Base64url uses
pack("m0")rather than theBase64module, because Ruby 3.4 no longer bundles the base64 gem and the gemspec doesn't depend on it. Key names may be symbols; values must be strings.The tests run the shared vectors from the API (SchematicHQ/schematic-api#9729), copied into
test/testdata/. They ran locally on Ruby 4.0.4; CI runs 3.3. Merge after #9729, and refresh the copy if the vectors change there.