4 files changed, 128 insertions, 0 deletions
diff --git a/apps/cdn/.gitignore b/apps/cdn/.gitignore
new file mode 100644
index 00000000..ae33762f
--- /dev/null
+++ b/apps/cdn/.gitignore
@@ -0,0 +1,5 @@
+# Wrangler
+.wrangler
+
+# Node.js
+node_modules
diff --git a/apps/cdn/index.ts b/apps/cdn/index.ts
new file mode 100644
index 00000000..55c51256
--- /dev/null
+++ b/apps/cdn/index.ts
@@ -0,0 +1,112 @@
+// <https://github.com/soruly/trace.moe-www/blob/master/image-proxy.js>
+
+addEventListener("fetch", async (event) => {
+  event.respondWith(handleRequest(event.request));
+});
+
+const errorResponse = (errorMessage) =>
+  new Response(errorMessage, {
+    status: 400,
+    statusText: "Bad Request",
+  });
+
+const handleRequest = async (originalRequest) => {
+  let originalURL = new URL(originalRequest.url);
+  if (!originalURL.searchParams.get("url")) {
+    return errorResponse("Error: Cannot get url from param");
+  }
+
+  let imageURL = null;
+  try {
+    imageURL = new URL(originalURL.searchParams.get("url"));
+  } catch (e) {}
+  if (!imageURL) {
+    return errorResponse("Error: Invalid URL string");
+  }
+
+  let imageRequest = new Request(imageURL, {
+    redirect: "follow",
+    headers: {
+      referer: imageURL.origin,
+    },
+  });
+
+  let response = await fetch(imageRequest, {
+    cf: {
+      polish: "lossy",
+      cacheEverything: true,
+    },
+  });
+
+  if (response.status >= 400) {
+    return new Response(response.body, {
+      status: response.status,
+      statusText: response.statusText,
+      headers: response.headers,
+    });
+  }
+
+  // if (
+  //   response.headers.get("Content-Type").toLowerCase() !==
+  //     "application/octet-stream" &&
+  //   !["image", "video"].includes(
+  //     response.headers.get("Content-Type").split("/")[0].toLowerCase()
+  //   )
+  // ) {
+  //   // retry as bot to get og:image
+  //   let webResponse = await fetch(
+  //     new Request(imageURL, {
+  //       redirect: "follow",
+  //       headers: {
+  //         referer: imageURL.origin,
+  //         "User-Agent": "googlebot",
+  //       },
+  //     })
+  //   );
+  //   if (response.status === 200) {
+  //     const ogImageURL = (await webResponse.text())
+  //       ?.match(/<[^<]+?"og:image".*?>/, "$1")?.[0]
+  //       ?.match(/content="(.*?)"/, "$1")?.[1];
+
+  //     if (ogImageURL && ogImageURL.match(/^https?:\/\//)) {
+  //       response = await fetch(
+  //         new Request(ogImageURL, {
+  //           redirect: "follow",
+  //           headers: {
+  //             referer: imageURL.origin,
+  //           },
+  //         })
+  //       );
+  //       if (response.status >= 400) {
+  //         return new Response(response.body, {
+  //           status: response.status,
+  //           statusText: response.statusText,
+  //           headers: response.headers,
+  //         });
+  //       }
+  //     }
+  //   }
+  // }
+  // if (
+  //   response.headers.get("Content-Type").toLowerCase() !==
+  //     "application/octet-stream" &&
+  //   !["image", "video"].includes(
+  //     response.headers.get("Content-Type").split("/")[0].toLowerCase()
+  //   )
+  // ) {
+  //   return errorResponse(
+  //     "Error: Content-Type is not image or video or application/octet-stream"
+  //   );
+  // }
+
+  return new Response(response.body, {
+    status: response.status,
+    statusText: response.statusText,
+    headers: {
+      "Cache-Control":
+        "public, immutable, s-maxage=31536000, max-age=31536000, stale-while-revalidate=60",
+      "Access-Control-Allow-Origin": "https://due.moe",
+      ...response.headers,
+    },
+  });
+};
diff --git a/apps/cdn/package.json b/apps/cdn/package.json
new file mode 100644
index 00000000..33970b95
--- /dev/null
+++ b/apps/cdn/package.json
@@ -0,0 +1,7 @@
+{
+  "private": true,
+  "devDependencies": {
+    "@types/node": "^17.0.42",
+    "typescript": "^4.7.3"
+  }
+}
diff --git a/apps/cdn/wrangler.toml b/apps/cdn/wrangler.toml
new file mode 100644
index 00000000..adb3e071
--- /dev/null
+++ b/apps/cdn/wrangler.toml
@@ -0,0 +1,4 @@
+name = "cdn"
+main = "./index.ts"
+compatibility_date = "2023-10-30"
+