20 lines
703 B
JavaScript
20 lines
703 B
JavaScript
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/**
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* Extract the payload of an SSE `data:` field.
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*
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* The WHATWG EventSource spec treats the space after the colon as optional
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* and strips at most one leading U+0020. Older AxonHub (0.9) and some
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* intranet OpenAI-compat proxies emit `data:{json}` with no space, which
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* a `data: ` prefix check silently drops (issue #3020).
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*
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* @param {unknown} line
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* @returns {string | null}
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*/
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function extractSseDataPayload(line) {
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const trimmed = typeof line === "string" ? line.trim() : "";
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if (!trimmed.startsWith("data:")) return null;
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const payload = trimmed.slice("data:".length);
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return payload.startsWith(" ") ? payload.slice(1) : payload;
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}
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module.exports = { extractSseDataPayload };
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