feat(ipfs.ts): add support for HEAD request method

fix(ipfs.ts): adjust image check conditions to include isHead
test(ipfs.test.ts): add test case for HEAD request with image content type

Author: preschian

image/src/routes/ipfs.ts

@@ -12,6 +12,7 @@ app.use('/*', cors({ origin: allowedOrigin }))
 app.get('/*', async (c) => {
   const { original } = c.req.query()
   const isOriginal = original === 'true'
+  const isHead = c.req.method === 'HEAD'
 
   const url = new URL(c.req.url)
   const path = url.pathname.replace('/ipfs/', '')
@@ -34,7 +35,7 @@ app.get('/*', async (c) => {
   // 1. check existing image on cf-images && !isOriginal
   // ----------------------------------------
   console.log('step 1')
-  if (mimeType?.includes('image') && !isOriginal) {
+  if (mimeType?.includes('image') && !isOriginal && !isHead) {
     const publicUrl = await getImageByPath({
       token: c.env.IMAGE_API_TOKEN,
       imageAccount: c.env.CF_IMAGE_ACCOUNT,
@@ -119,7 +120,7 @@ app.get('/*', async (c) => {
     imageAccount: c.env.CF_IMAGE_ACCOUNT,
   })
 
-  if (imageUrl && !isOriginal) {
+  if (imageUrl && !isOriginal && !isHead) {
     return c.redirect(imageUrl)
   }
 

image/src/tests/ipfs.test.ts

@@ -11,6 +11,17 @@ test('[head] ipfs - 200 - json', async () => {
   expect(res.headers.get('content-type')).toBe('application/json')
 })
 
+test('[head] ipfs - 200 - image', async () => {
+  const res = await fetch(
+    'https://image-beta.w.kodadot.xyz/ipfs/bafybeidv3wgydacgpre67lkciihrttvwl5nibzftxfppy6lfanjja4v7zm',
+    { method: 'HEAD', redirect: 'manual' }
+  )
+
+  expect(res.ok).toBe(true)
+  expect(res.status).toBe(200)
+  expect(res.headers.get('content-type')).toBe('image/jpeg')
+})
+
 test('ipfs - 200 - json', async () => {
   const res = await fetch(
     'https://image-beta.w.kodadot.xyz/ipfs/bafkreihy6xwb35imb5hfwxzgmw2p64yoefuxysh6bkghyjwaj7tz5sfnuq'