Initial commit

src/github/context.ts

@@ -0,0 +1,139 @@
+import * as github from "@actions/github";
+import type {
+  IssuesEvent,
+  IssueCommentEvent,
+  PullRequestEvent,
+  PullRequestReviewEvent,
+  PullRequestReviewCommentEvent,
+} from "@octokit/webhooks-types";
+
+export type ParsedGitHubContext = {
+  runId: string;
+  eventName: string;
+  eventAction?: string;
+  repository: {
+    owner: string;
+    repo: string;
+    full_name: string;
+  };
+  actor: string;
+  payload:
+    | IssuesEvent
+    | IssueCommentEvent
+    | PullRequestEvent
+    | PullRequestReviewEvent
+    | PullRequestReviewCommentEvent;
+  entityNumber: number;
+  isPR: boolean;
+  inputs: {
+    triggerPhrase: string;
+    assigneeTrigger: string;
+    allowedTools: string;
+    disallowedTools: string;
+    customInstructions: string;
+    directPrompt: string;
+  };
+};
+
+export function parseGitHubContext(): ParsedGitHubContext {
+  const context = github.context;
+
+  const commonFields = {
+    runId: process.env.GITHUB_RUN_ID!,
+    eventName: context.eventName,
+    eventAction: context.payload.action,
+    repository: {
+      owner: context.repo.owner,
+      repo: context.repo.repo,
+      full_name: `${context.repo.owner}/${context.repo.repo}`,
+    },
+    actor: context.actor,
+    inputs: {
+      triggerPhrase: process.env.TRIGGER_PHRASE ?? "@claude",
+      assigneeTrigger: process.env.ASSIGNEE_TRIGGER ?? "",
+      allowedTools: process.env.ALLOWED_TOOLS ?? "",
+      disallowedTools: process.env.DISALLOWED_TOOLS ?? "",
+      customInstructions: process.env.CUSTOM_INSTRUCTIONS ?? "",
+      directPrompt: process.env.DIRECT_PROMPT ?? "",
+    },
+  };
+
+  switch (context.eventName) {
+    case "issues": {
+      return {
+        ...commonFields,
+        payload: context.payload as IssuesEvent,
+        entityNumber: (context.payload as IssuesEvent).issue.number,
+        isPR: false,
+      };
+    }
+    case "issue_comment": {
+      return {
+        ...commonFields,
+        payload: context.payload as IssueCommentEvent,
+        entityNumber: (context.payload as IssueCommentEvent).issue.number,
+        isPR: Boolean(
+          (context.payload as IssueCommentEvent).issue.pull_request,
+        ),
+      };
+    }
+    case "pull_request": {
+      return {
+        ...commonFields,
+        payload: context.payload as PullRequestEvent,
+        entityNumber: (context.payload as PullRequestEvent).pull_request.number,
+        isPR: true,
+      };
+    }
+    case "pull_request_review": {
+      return {
+        ...commonFields,
+        payload: context.payload as PullRequestReviewEvent,
+        entityNumber: (context.payload as PullRequestReviewEvent).pull_request
+          .number,
+        isPR: true,
+      };
+    }
+    case "pull_request_review_comment": {
+      return {
+        ...commonFields,
+        payload: context.payload as PullRequestReviewCommentEvent,
+        entityNumber: (context.payload as PullRequestReviewCommentEvent)
+          .pull_request.number,
+        isPR: true,
+      };
+    }
+    default:
+      throw new Error(`Unsupported event type: ${context.eventName}`);
+  }
+}
+
+export function isIssuesEvent(
+  context: ParsedGitHubContext,
+): context is ParsedGitHubContext & { payload: IssuesEvent } {
+  return context.eventName === "issues";
+}
+
+export function isIssueCommentEvent(
+  context: ParsedGitHubContext,
+): context is ParsedGitHubContext & { payload: IssueCommentEvent } {
+  return context.eventName === "issue_comment";
+}
+
+export function isPullRequestEvent(
+  context: ParsedGitHubContext,
+): context is ParsedGitHubContext & { payload: PullRequestEvent } {
+  return context.eventName === "pull_request";
+}
+
+export function isPullRequestReviewEvent(
+  context: ParsedGitHubContext,
+): context is ParsedGitHubContext & { payload: PullRequestReviewEvent } {
+  return context.eventName === "pull_request_review";
+}
+
+export function isPullRequestReviewCommentEvent(
+  context: ParsedGitHubContext,
+): context is ParsedGitHubContext & { payload: PullRequestReviewCommentEvent } {
+  return context.eventName === "pull_request_review_comment";
+}