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add a context signing helper - #215
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bpapillon merged 1 commit intoNov 3, 2026
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Adds
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;ContextSignatureOptions.Lifetimeaccepts up to the API's one-hour maximum, andIssuedAtsets the start time. It matches the Go and Node helpers (SchematicHQ/schematic-go#263, SchematicHQ/schematic-node#216).The JSON is built by hand rather than with
System.Text.Json, whose encoders escape differently from the API. Keys sort by code point, since ordinal comparison is UTF-16 order; U+2028 and U+2029 are escaped, and lone surrogates become U+FFFD as the API reads them. Base64url is done by hand so net8.0 doesn't needBase64Url.The tests run the shared vectors from the API (SchematicHQ/schematic-api#9729), copied into the test project and to its output. They ran on net9.0, the only framework the test project targets. Merge after #9729, and refresh the copy if the vectors change there.