Fix paste ownership, input bounds, and IPC validation

Supersedes #5745, #5746, and #5747.

src/shared/github-project-ref-input.test.ts

@@ -0,0 +1,45 @@
+import { describe, expect, it } from 'vitest'
+
+import {
+  GITHUB_PROJECT_REF_INPUT_MAX_BYTES,
+  getGitHubProjectRefInputByteLength,
+  hasBoundedGitHubProjectRefInputText,
+  isGitHubProjectRefInputTooLarge
+} from './github-project-ref-input'
+
+describe('GitHub project reference input limits', () => {
+  it('allows normal project references below the byte budget', () => {
+    expect(
+      isGitHubProjectRefInputTooLarge('https://github.com/orgs/acme/projects/42/views/3')
+    ).toBe(false)
+  })
+
+  it('measures UTF-8 bytes instead of JavaScript string length', () => {
+    expect(getGitHubProjectRefInputByteLength('\u00e9')).toBe(2)
+  })
+
+  it('rejects oversized pasted project references', () => {
+    expect(isGitHubProjectRefInputTooLarge('x'.repeat(GITHUB_PROJECT_REF_INPUT_MAX_BYTES))).toBe(
+      false
+    )
+    expect(
+      isGitHubProjectRefInputTooLarge('x'.repeat(GITHUB_PROJECT_REF_INPUT_MAX_BYTES + 1))
+    ).toBe(true)
+  })
+
+  it('rejects multibyte project references whose character count is below the limit', () => {
+    const reference = '😀'.repeat(Math.floor(GITHUB_PROJECT_REF_INPUT_MAX_BYTES / 4) + 1)
+
+    expect(reference.length).toBeLessThan(GITHUB_PROJECT_REF_INPUT_MAX_BYTES)
+    expect(isGitHubProjectRefInputTooLarge(reference)).toBe(true)
+  })
+
+  it('rejects oversized whitespace before submit checks trim the reference', () => {
+    const oversizedWhitespace = ' '.repeat(GITHUB_PROJECT_REF_INPUT_MAX_BYTES + 1)
+
+    expect(isGitHubProjectRefInputTooLarge(oversizedWhitespace)).toBe(true)
+    expect(hasBoundedGitHubProjectRefInputText(oversizedWhitespace)).toBe(false)
+    expect(hasBoundedGitHubProjectRefInputText('  acme/42  ')).toBe(true)
+    expect(hasBoundedGitHubProjectRefInputText('   ')).toBe(false)
+  })
+})