1 files changed, 40 insertions, 0 deletions
diff --git a/src/resolve-request.js b/src/resolve-request.js
new file mode 100644
index 0000000..75f1f11
--- /dev/null
+++ b/src/resolve-request.js
@@ -0,0 +1,40 @@
+const notionImagePrefix = 'https://www.notion.so/image/'
+
+/**
+ * @param {*} event
+ * @param {*} request
+ */
+export async function resolveRequest(event, request) {
+  const requestUrl = new URL(request.url)
+  let originUri = decodeURIComponent(requestUrl.pathname.slice(1))
+
+  // special-case optimization for notion images coming from unsplash
+  if (originUri.startsWith(notionImagePrefix)) {
+    const imageUri = decodeURIComponent(
+      originUri.slice(notionImagePrefix.length)
+    )
+    const imageUrl = new URL(imageUri)
+
+    // adjust unsplash defaults to have a max width and intelligent format conversion
+    if (imageUrl.hostname === 'images.unsplash.com') {
+      const { searchParams } = imageUrl
+
+      if (!searchParams.has('w') && !searchParams.has('fit')) {
+        imageUrl.searchParams.set('w', 1920)
+        imageUrl.searchParams.set('fit', 'max')
+      }
+
+      if (!searchParams.has('auto')) {
+        imageUrl.searchParams.set('auto', 'format')
+      }
+
+      originUri = `${notionImagePrefix}${encodeURIComponent(
+        imageUrl.toString()
+      )}`
+    }
+  }
+
+  const originReq = new Request(originUri, request)
+
+  return { originReq }
+}