Add a way to set a custom middleware for refreshing the access token

[lassesteffen]

Currently we are not able to add a custom middleware for e. g. refreshing an access token. This stems from the fact, that the authLink is the first link, and I can not easily add another link before this authLink (which sets the token).

Am I missing something or is there just no support for this?

[Akryum]

Do you have an example of how it would look like?

[lassesteffen]

Thanks for the response! This is what I need and what I was not able to build with this plugin. I think the example is pretty : straight forward:

const refreshTokenLink = setContext(() => AuthenticationService.renewSessionIfExpired());

const authLink = setContext((_, { headers }) => {
  const { accessToken } = store.state.user;
  const newHeaders = {
    ...headers,
  };
  if (accessToken !== null) {
    newHeaders['authorization'] = `JWT ${accessToken}`;
  }

  return {
    headers: newHeaders,
  };
});

const httpLink = createUploadLink({ uri: httpEndpoint });

const link = ApolloLink.from([refreshTokenLink, authLink, httpLink]);

In the code the first link is always the AuthLink. If there would be some option like a preAuthLink, that could be passed in that would be awesome.

{
    ....

    const authLinkChain = authLink
    if (preAuthLink) {
       authLinkChain = preAuthLink.concat(authLink)
    }
    
    // Concat all the http link parts
    link = authLinkChain.concat(link)

    ....
  }

[matrunchyk]

@lassesteffen please take a look on this PR and check whether it would work for your case.

It allows to pass a few pre-auth links. So I think using like the following should make the deal:

// ...
preAuthLinks: [refreshTokenLink],
// ...

[lassesteffen]

Looks good to me!

[matrunchyk]

Great!
@Akryum are you okay with merging the relevant PR then?

[matrunchyk]

Maybe other upvoters can also check this @Durss, @oller, @madmod, @thetre97

[boydaihungst]

@matrunchyk You forgot to add .concat(link)
It should be

if (preAuthLinks.length) { 
      link = from(preAuthLinks).concat(link)
}