88 lines
3.3 KiB
TypeScript
88 lines
3.3 KiB
TypeScript
import { TTL } from "../deps.ts";
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import { UrlConfig } from "./types.d.ts";
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import { requestLog } from "./util.ts";
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const reviewComments = new TTL<number>(2 * 1000);
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export default function filter(headers: Headers, json: any, config: UrlConfig): string | null {
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const reqLog = requestLog(headers);
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const event = headers.get("x-github-event") || "unknown";
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const login: string | undefined = json.sender?.login?.toLowerCase();
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// ignore events that Discord won't render anyway
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if (["status", "pull_request_review_thread"].includes(event)) {
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return event;
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}
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// ignore all PR actions except "opened", "closed", "reopened"
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if (
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event === "pull_request" && json.action &&
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!["opened", "closed", "reopened"].includes(json.action)
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) {
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return `no-op PR action '${json.action}'`;
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}
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// ignore all issue actions except "opened", "deleted", "closed", "reopened", "transferred"
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if (
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event === "issues" && json.action &&
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!["opened", "deleted", "closed", "reopened", "transferred"].includes(json.action)
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) {
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return `no-op issue action '${json.action}'`;
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}
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// ignore some PR review actions
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if (event === "pull_request_review") {
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// ignore edit/dismiss actions
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if (json.action !== "submitted") return `no-op PR review action '${json.action}'`;
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// if comment (not approval or changes requested), ignore empty review body
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else if (json.review?.state === "commented" && !json.review?.body) return "empty PR review";
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}
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// ignore some PR comment events
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if (event === "pull_request_review_comment") {
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// ignore edit/delete actions
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if (json.action !== "created") return `no-op PR comment action '${json.action}'`;
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// check if more than x comments on a PR review in a short timespan
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const reviewId: number = json.comment?.pull_request_review_id;
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if (config.commentBurstLimit && reviewId) {
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const cacheKey = `${reviewId}-${login}`;
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reqLog.debug(`filter: checking cache key ${cacheKey}`);
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reqLog.debug(
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`filter: full comment cache ${JSON.stringify(Array.from(reviewComments))}`,
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);
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const curr = reviewComments.get(cacheKey);
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if (curr && curr >= config.commentBurstLimit) {
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return `exceeded comment burst limit (${config.commentBurstLimit}) for review ${reviewId}`;
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}
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reviewComments.set(cacheKey, (curr ?? 0) + 1);
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}
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}
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// ignore bots
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if (
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login &&
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["coveralls[bot]", "netlify[bot]", "pre-commit-ci[bot]"].some((n) => login.includes(n))
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) {
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return "bot";
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}
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// ignore branch/tag if configured
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const refMatch = /^refs\/([^\/]+)\/(.+)$/.exec(json.ref);
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if (event === "push" && refMatch) {
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// check if branch is allowed
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if (
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refMatch[1] == "heads" && config.allowBranches !== undefined &&
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!config.allowBranches.includes(refMatch[2])
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) {
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return `branch '${refMatch[2]}' not in ${JSON.stringify(config.allowBranches)}`;
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}
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// check if it's a tag
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if (refMatch[1] == "tags" && config.hideTags === true) {
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return `tag '${refMatch[2]}'`;
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}
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}
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return null;
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}
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