Theo's Typesafe Cult•2mo ago

Where's the best place to get the hash of a file?

When users upload files to my app, I want to generate the md5 hash - where's the best place to hook into the uploadthing flow to do this?

Solution:

```ts .onUploadComplete(async ({ metadata, file }) => { console.log("file url", file.url); const buffer = await fetch(file.url).then((f) => f.arrayBuffer());...

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9 Replies

greypixel•2mo ago

(using Next)

Neto•2mo ago

const crypto = require("node:crypto");

const hash = crypto.createHash("md5").setEncoding("hex");

hash.end(Buffer.from("UThing"));

console.log(hash.read());
// ddd448340180a2d9ffafc031562e4900

const crypto = require("node:crypto");

const hash = crypto.createHash("md5").setEncoding("hex");

hash.end(Buffer.from("UThing"));

console.log(hash.read());
// ddd448340180a2d9ffafc031562e4900

replace Buffer.from("UThing") with the file buffer (fetch it)

greypixel•2mo ago

Thanks, so it's best to do this in onUploadComplete? Does the file get streamed to my server before uploadThing? Or is the request somehow redirected?

Solution

Neto•2mo ago

.onUploadComplete(async ({ metadata, file }) => {
      console.log("file url", file.url);

      const buffer = await fetch(file.url).then((f) => f.arrayBuffer());
      // calculate hash
 
      // !!! Whatever is returned here is sent to the clientside `onClientUploadComplete` callback
      return { };
    }),

.onUploadComplete(async ({ metadata, file }) => {
      console.log("file url", file.url);

      const buffer = await fetch(file.url).then((f) => f.arrayBuffer());
      // calculate hash
 
      // !!! Whatever is returned here is sent to the clientside `onClientUploadComplete` callback
      return { };
    }),

something like this

greypixel•2mo ago

Thanks, super useful 🙂 out of interest would there be a way to check the hash before it goes to uploadThing? just trying to get the right mental model

Neto•2mo ago

let me check

Neto•2mo ago

most likely not

greypixel•2mo ago

thanks ser 🙂 really appreciate yourtime

Neto•2mo ago

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Where's the best place to get the hash of a file?