feat(cname-prefix): add isPrefixedCdnBase helper (#547)

Co-authored-by: nd0ut <[email protected]>

Author: nd0ut

packages/cname-prefix/src/async/index.ts

@@ -1 +1,2 @@
 export { getPrefixedCdnBaseAsync } from './getPrefixedCdnBaseAsync'
+export { isPrefixedCdnBase } from '../common/isPrefixedCdnBase'

packages/cname-prefix/src/common/isPrefixedCdnBase.test.ts

@@ -0,0 +1,34 @@
+import { isPrefixedCdnBase } from './isPrefixedCdnBase'
+import { describe, it, expect } from 'vitest'
+
+describe('isPrefixedCdnBase', () => {
+  it('should return true for a prefixed CDN base', () => {
+    const cdnBase = 'https://prefix.ucarecd.net'
+    const prefixCdnBase = 'https://ucarecd.net'
+    expect(isPrefixedCdnBase(cdnBase, prefixCdnBase)).toBe(true)
+  })
+
+  it('should return false for a non-prefixed CDN base', () => {
+    const cdnBase = 'https://ucarecdn.com'
+    const prefixCdnBase = 'https://ucarecd.net'
+    expect(isPrefixedCdnBase(cdnBase, prefixCdnBase)).toBe(false)
+  })
+
+  it('should return false for an invalid URL', () => {
+    const cdnBase = 'invalid-url'
+    const prefixCdnBase = 'https://ucarecd.net'
+    expect(isPrefixedCdnBase(cdnBase, prefixCdnBase)).toBe(false)
+  })
+
+  it('should return false for a CDN base with an unexpected format', () => {
+    const cdnBase = 'https://ucarecdn.com/some/path'
+    const prefixCdnBase = 'https://ucarecd.net'
+    expect(isPrefixedCdnBase(cdnBase, prefixCdnBase)).toBe(false)
+  })
+
+  it('should return false for a prefix that does not match the CDN base origin', () => {
+    const cdnBase = 'https://prefix.ucarecdn.com'
+    const prefixCdnBase = 'https://ucarecd.net'
+    expect(isPrefixedCdnBase(cdnBase, prefixCdnBase)).toBe(false)
+  })
+})

packages/cname-prefix/src/common/isPrefixedCdnBase.ts

@@ -0,0 +1,9 @@
+export const isPrefixedCdnBase = (cdnBase: string, prefixCdnBase: string) => {
+  try {
+    const cdnBaseUrl = new URL(cdnBase)
+    const prefixCdnBaseUrl = new URL(prefixCdnBase)
+    return cdnBaseUrl.hostname.endsWith(prefixCdnBaseUrl.hostname)
+  } catch (_err) {
+    return false
+  }
+}

packages/cname-prefix/src/index.ts

@@ -1,2 +1,3 @@
 export { getPrefixedCdnBaseAsync } from './async'
 export { getPrefixedCdnBaseSync } from './sync'
+export { isPrefixedCdnBase } from './common/isPrefixedCdnBase'

packages/cname-prefix/src/sync/index.ts

@@ -1 +1,2 @@
 export { getPrefixedCdnBaseSync } from './getPrefixedCdnBaseSync'
+export { isPrefixedCdnBase } from '../common/isPrefixedCdnBase'