rescript-rest/src/RestNextJs.res.js

😴 ReScript RPC-like client, contract, and server implementation for a pure REST API

// Generated by ReScript, PLEASE EDIT WITH CARE
'use strict';

var Rest = require("./Rest.res.js");
var Js_exn = require("rescript/lib/js/js_exn.js");
var S$RescriptSchema = require("rescript-schema/src/S.res.js");
var Caml_js_exceptions = require("rescript/lib/js/caml_js_exceptions.js");

function handler(route, implementation) {
  var match = Rest.params(route);
  var isRawBody = match.isRawBody;
  var outputSchema = match.outputSchema;
  var inputSchema = match.inputSchema;
  var path = match.path;
  var method = match.method;
  match.pathItems.forEach(function (pathItem) {
        if (typeof pathItem === "string") {
          return ;
        }
        throw new Error("[rescript-rest] " + ("Route " + path + " contains a path param " + pathItem.name + " which is not supported by Next.js handler yet"));
      });
  return async function (req, res) {
    if (req.method !== method) {
      return res.status(404).end();
    }
    if (req.body === undefined) {
      var rawBody = {
        contents: ""
      };
      await new Promise((function (resolve, reject) {
              req.on("data", (function (chunk) {
                      rawBody.contents = rawBody.contents + chunk;
                    }));
              req.on("end", resolve);
              req.on("error", reject);
            }));
      req.body = isRawBody ? rawBody.contents : JSON.parse(rawBody.contents);
    } else if (isRawBody) {
      Js_exn.raiseError("Routes with Raw Body require to disable body parser for your handler. Add `let config: RestNextJs.config = {api: {bodyParser: false}}` to the file with your handler to make it work.");
    }
    var input;
    try {
      input = S$RescriptSchema.parseOrThrow(req, inputSchema);
    }
    catch (raw_error){
      var error = Caml_js_exceptions.internalToOCamlException(raw_error);
      if (error.RE_EXN_ID === S$RescriptSchema.Raised) {
        return res.status(400).json({
                    error: S$RescriptSchema.$$Error.message(error._1)
                  });
      }
      throw error;
    }
    try {
      var implementationResult = await implementation({
            input: input,
            req: req,
            res: res
          });
      var data = S$RescriptSchema.reverseConvertOrThrow(implementationResult, outputSchema);
      var headers = data.headers;
      if (headers !== undefined) {
        Object.keys(headers).forEach(function (key) {
              res.setHeader(key, headers[key]);
            });
      }
      return res.status((data.status || 200)).json(data.data);
    }
    catch (raw_error$1){
      var error$1 = Caml_js_exceptions.internalToOCamlException(raw_error$1);
      if (error$1.RE_EXN_ID === S$RescriptSchema.Raised) {
        return Js_exn.raiseError("Unexpected error in the " + path + " route: " + S$RescriptSchema.$$Error.message(error$1._1));
      }
      throw error$1;
    }
  };
}

exports.handler = handler;
/* Rest Not a pure module */