CODEWITHSUNDEEP
node.jsapifastify
B.Dwyer
B.Dwyer

Reputation: 69

How to preserve request queries with fastify-http-proxy while adding an api-key query parameter in a proxy

I have a small project with a node.js + fastify server, in which I want to proxy requests to an external API using fastify-http-proxy https://github.com/fastify/fastify-http-proxy (no existing tags here). This external API wants their api-key specified as a query param. I want to add this key to the proxied requests in my server, and not in our front-end. However I can't seem to get it to work with replyOptions.queryString, since it does not have direct access to request.query it overrides the original request queries, rendering the entire call useless:

    let originalRequestQueries = {};
    
    fastify.register(proxy, {
      upstream: CONFIG.externalApi,
      prefix: '/api/stocks',
      undici: true,
      replyOptions: {
        queryString: {
          ...originalRequestQueries,
          apikey: CONFIG.apiKey,
        },
      },
      preHandler: async (req, reply) => {
        try {
          await req.jwtVerify();
          originalRequestQueries = req.query;
          console.log(originalRequestQueries);
        } catch (err) {
          throw boom.boomify(err);
        }
      },
    });

Any tips on how to make this work? I can't seem to find information regarding this anywhere in fastify-http-proxy documentation nor fastify-reply-from which it was built on. The proxy works perfectly fine if I specify the apikey query param in the request coming in to the server. Kind regards, B

Upvotes: 0

Views: 1965

Answers (2)

user21058576
user21058576

Reputation: 1

You can try this if you want to handle it within the queryString replyOption:

queryString: (search, reqUrl) => {
  reqUrl = reqUrl.split("?").pop();
  var query = querystring.parse(reqUrl);
  query.apikey = CONFIG.apiKey;
  return querystring.stringify(query);
}

Upvotes: 0

B.Dwyer
B.Dwyer

Reputation: 69

I got it to work by adding

req.raw.url = `${req.raw.url}&apikey=${CONFIG.apiKey}`;

into the preHandler function. Strangely, this worked but not any alterations to req.query.

Upvotes: 3

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