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I need to serve files from grapghql, is it possible?

DeChamp on October 22, 2019

So the need is to allow files to be a payload from the grapghql server. The current setup is the server is running express which is responsible for...
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Stefanos Kouroupis • Edited

Don't know much about graphQL if you can send the bytes through the socket, then you can reconstruct ithe file in the front end. with something like this:

        const blob = new Blob([data], { type: 'application/pdf'});
        const url = window.URL.createObjectURL(blob);
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DeChamp

This was my original thought and hope. We decided not to force gql into something it's not meant to do.

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Dor Shinar

Generally, GraphQL endpoints don't deal with binary data. As a matter of fact I've been in charge in my team on providing upload and download of files from our GraphQL endpoint. In the end, I've settled on a /download express endpoint. If you insist on using the GraphQL layer, you can encoder the files in base64 and send the encoded strings.

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DeChamp

We are also going to just go with our original plan and add a new restful service which shares the auth service. Base64 would have been fine had we not needed to deal with large files.

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BiscuiTech • Edited

I was able to setup a mutation handling files up to 10Mb through "graphql-server-upload" on GitHub. If you want some help, feel free to hit me up and we'll initiate a conversation.

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DeChamp

also, how was it for you? Easy to setup for the upload?

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BiscuiTech

As far as speed, I didn't experience anything less than "normal". Downloads speed were good and overall download/upload experience of the End User was good.

For the setup, I really struggled at first, but that was because I had a custom apollo-server backend that needed retrofit. After the setup on that side was done, adding mutations and processing files is really easy.

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DeChamp

So we can do this too, the issue is download. We just can't get it to deliver raw files and base64 didn't feel like a proper solution due to the size of the files.

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Andy Mikula

Is external storage an option? For example, sending over an S3 URL via the server and then retrieving the file from there?

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DeChamp

It could be a option and one that we discussed. The concern is if for what ever reason someone were to gain access to that url, they could gain access to protected information. We prefer it be locked down

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Andy Mikula

That's fair! With S3 (and likely other solutions) you can generate expiring URLs which might solve for part of that problem, and set up access control to restrict things to requests from your application, but that might end up being more work up front than keeping everything in-house.

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DeChamp

We deal with PHI, so we can not have a unsecured link, even if it expired right away. So unfortunately this was not a working solutions for us. But it is a good solution for other cases. Thank you for the suggestion. We are going to end up creating a new restful service to deliver the files behind the auth.