All files / api ApiRequest.js

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/* @flow */
 
import request from "superagent";
import invariant from "invariant";
import { httpProgressMiddleware } from "../utils";
import type { ApiRequestOptions, ApiResult } from "./types";
 
let inProgress: { [id: string]: number } = {};
let waitCallbacks: {
  [id: string]: Array<[(T: ApiResult) => void, ApiRequestOptions]>
} = {};
 
export default function ApiRequest(url: string, options: ApiRequestOptions = {}): Promise<ApiResult> {
  invariant(url.length, "`url` is required.");
 
  let {
    method = "get",
    responseType = "json",
    onProgress = () => {},
    xhr = () => {},
    pipe = false,
    files = []
  } = options;
 
  if (method === "get" && url in inProgress) {
    Eif (waitCallbacks[url] === undefined) {
      waitCallbacks[url] = [];
    }
 
    return new Promise(resolve => {
      waitCallbacks[url].push([
        (response: ApiResult) => {
          resolve(response);
        },
        options
      ]);
    });
  } else {
    inProgress[url] = 1;
  }
 
  // call
  let req = request[method](url);
 
  // progress upload/download
  req.on("progress", onProgress);
 
  // attaching files
  // works for both node/web
  // in one case its path to file, in the other is File object
  if (files.length) {
    invariant(["put", "post"].indexOf(method) !== -1, "When uploading, `method` must be either `post` or `put`.");
 
    files.forEach(({ name = undefined, file }) => {
      invariant(file, "`file` is a required property of `files`.");
 
      req.attach(filenameKey(), file, name);
    });
  }
 
  Iif ("responseType" in req && responseType !== "json") {
    req.responseType(responseType);
  }
 
  Eif (ENV === "node") {
    // node only progress based on the stream events
    req.use(httpProgressMiddleware);
 
    /**
     * `superagent` cannot be used as then-able object when piping and since
     * when piping the "end" is called anyway, we need to create and
     * manage different promise for this case only.
     */
    Iif (pipe) {
      return new Promise((resolve, reject) => {
        req.pipe(pipe).on("finish", resolve).on("error", reject);
      });
    }
  }
 
  // pass xhr object before calling the request
  // important for custom checking the progress of the call
  // in case of intentionally blocking operations and so on...
  xhr(req.xhr);
 
  /*
  return new Promise((resolve, reject) => {
    req.end((error, response) => {
      if (error) {
        clearInProgressCallbacks();
        reject({ result: error.status || 500, error: "Network Error" });
      } else {
        if (responseType === "json") {
          const { body } = response;
 
          callbacksReceiveBody(body);
          resolve(body);
        } else if (responseType === "text") {
          resolve(response.text);
        }
      }
    });
  });
  */
 
  return req
    .then(response => {
      if (responseType === "json") {
        const { body } = response;
 
        callbacksReceiveBody(body);
        return body;
      } else Eif (responseType === "text") {
        return response.text;
      }
    })
    .catch(error => {
      const errorObj = { result: error.status || 500, error: "Network Error" };
 
      clearInProgressCallbacks();
 
      return Promise.reject(errorObj);
    });
 
  // clear currently running urls
  function clearInProgressCallbacks() {
    Eif (url in inProgress) {
      delete inProgress[url];
    }
  }
 
  // send all currently waiting tasks their data
  function callbacksReceiveBody(body) {
    clearInProgressCallbacks();
 
    Iif (url in waitCallbacks) {
      while (waitCallbacks[url].length) {
        const [callback] = waitCallbacks[url].shift();
 
        callback(body);
      }
    }
  }
}
 
let n = 1;
function filenameKey(): string {
  return "file-upload-" + (++n);
}