46 lines
1.3 KiB
TypeScript
46 lines
1.3 KiB
TypeScript
import type { Block, KnownBlock } from "@slack/web-api";
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const SLACK_MAX_BLOCKS = 50;
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function parseBlocksJson(raw: string) {
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try {
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return JSON.parse(raw);
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} catch {
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throw new Error("blocks must be valid JSON");
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}
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}
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function assertBlocksArray(raw: unknown) {
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if (!Array.isArray(raw)) {
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throw new Error("blocks must be an array");
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}
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if (raw.length === 0) {
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throw new Error("blocks must contain at least one block");
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}
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if (raw.length > SLACK_MAX_BLOCKS) {
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throw new Error(`blocks cannot exceed ${SLACK_MAX_BLOCKS} items`);
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}
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for (const block of raw) {
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if (!block || typeof block !== "object" || Array.isArray(block)) {
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throw new Error("each block must be an object");
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}
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const type = (block as { type?: unknown }).type;
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if (typeof type !== "string" || type.trim().length === 0) {
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throw new Error("each block must include a non-empty string type");
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}
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}
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}
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export function validateSlackBlocksArray(raw: unknown): (Block | KnownBlock)[] {
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assertBlocksArray(raw);
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return raw as (Block | KnownBlock)[];
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}
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export function parseSlackBlocksInput(raw: unknown): (Block | KnownBlock)[] | undefined {
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if (raw == null) {
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return undefined;
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}
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const parsed = typeof raw === "string" ? parseBlocksJson(raw) : raw;
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return validateSlackBlocksArray(parsed);
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}
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