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57 lines
2.5 KiB
Plaintext
57 lines
2.5 KiB
Plaintext
import contentType from 'content-type';
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/**
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* Extracts the media type (the lowercased `type/subtype` pair, without
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* parameters) from a raw `Content-Type` header value, or `undefined` when the
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* header is missing or empty.
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*
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* Content-Type comparisons must use the parsed media type, never a substring
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* search of the raw header: a value like `text/plain; a=application/json`
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* contains the substring `application/json` but its media type is
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* `text/plain`, and case variants or parameters make naive string comparison
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* wrong in both directions.
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*
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* "Essence" is the WHATWG MIME Sniffing standard's term for the bare
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* `type/subtype` pair (https://mimesniff.spec.whatwg.org/#mime-type-essence);
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* the Fetch standard's request classification is defined against it
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* (https://fetch.spec.whatwg.org/#cors-safelisted-request-header).
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*
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* Parsing is RFC 9110 (`content-type` package) first. When the parameter
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* section is malformed (`application/json;`, `application/json; charset=`),
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* browsers and most HTTP stacks still derive the media type from the segment
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* before the first `;` — the fallback matches that widely-implemented
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* behavior, so a header whose media type is unambiguous is not rejected for
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* a sloppy parameter section.
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*/
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export function mediaTypeEssence(header) {
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if (!header) {
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return undefined;
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}
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try {
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return contentType.parse(header).type;
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}
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catch {
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const essence = (header.split(';', 1)[0] ?? '').trim().toLowerCase();
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// A comma in the parameter tail of an unparseable value indicates
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// joined duplicate headers — ambiguous, so no essence at all (keeps
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// duplicate-header handling uniform whether or not the first copy
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// carries parameters).
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if (essence === '' || header.slice(essence.length).includes(',')) {
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return undefined;
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}
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return essence;
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}
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}
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/**
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* Whether a raw `Content-Type` header value denotes `application/json`.
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* Parameters (for example `charset=utf-8`) are allowed and ignored; malformed
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* parameter sections do not reject a header whose media type is unambiguously
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* `application/json` (see `mediaTypeEssence` for the exact grammar).
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*/
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export function isJsonContentType(header) {
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// Fast path: the exact literal is what SDK clients send on every POST.
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if (header === 'application/json') {
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return true;
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}
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return mediaTypeEssence(header) === 'application/json';
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}
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//# sourceMappingURL=mediaType.js.map |