46 lines
1.4 KiB
TypeScript
46 lines
1.4 KiB
TypeScript
import { wrapExternalContent } from "./external-content.js";
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const DEFAULT_MAX_CHARS = 800;
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const DEFAULT_MAX_ENTRY_CHARS = 400;
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function normalizeEntry(entry: string): string {
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return entry.replace(/\s+/g, " ").trim();
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}
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function truncateText(value: string, maxChars: number): string {
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if (maxChars <= 0) {
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return "";
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}
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if (value.length <= maxChars) {
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return value;
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}
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const trimmed = value.slice(0, Math.max(0, maxChars - 3)).trimEnd();
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return `${trimmed}...`;
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}
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export function buildUntrustedChannelMetadata(params: {
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source: string;
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label: string;
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entries: Array<string | null | undefined>;
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maxChars?: number;
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}): string | undefined {
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const cleaned = params.entries
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.map((entry) => (typeof entry === "string" ? normalizeEntry(entry) : ""))
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.filter((entry) => Boolean(entry))
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.map((entry) => truncateText(entry, DEFAULT_MAX_ENTRY_CHARS));
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const deduped = cleaned.filter((entry, index, list) => list.indexOf(entry) === index);
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if (deduped.length === 0) {
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return undefined;
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}
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const body = deduped.join("\n");
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const header = `UNTRUSTED channel metadata (${params.source})`;
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const labeled = `${params.label}:\n${body}`;
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const truncated = truncateText(`${header}\n${labeled}`, params.maxChars ?? DEFAULT_MAX_CHARS);
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return wrapExternalContent(truncated, {
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source: "channel_metadata",
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includeWarning: false,
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});
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}
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