import Cos from 'react-native-cos-sdk';

Cos.initWithSessionCredentialCallback(async () => {
  // First, obtain the response containing key information from your temporary key server, for example:
  // url for the temporary key server. For the temporary key generation service, see https://www.tencentcloud.com/document/product/436/14048
  let stsUrl = "http://stsservice.com/sts";
  let response = null;
  try{
    response = await fetch(stsUrl);
  } catch(e){
    console.error(e);
    return null;
  }
  // Then parse the response to obtain temporary key information
  const responseJson = await response.json();
  const credentials = responseJson.credentials;
  const startTime = responseJson.startTime;
  const expiredTime = responseJson.expiredTime;
  const sessionCredentials = {
    tmpSecretId: credentials.tmpSecretId,
    tmpSecretKey: credentials.tmpSecretKey,
    startTime: startTime, // startTime is a 10-digit timestamp.
    expiredTime: expiredTime, // expiredTime is a 10-digit timestamp.
    sessionToken: credentials.sessionToken
  };
  console.log(sessionCredentials);
  // Finally, return the temporary key information object
  return sessionCredentials;
})

import Cos from 'react-native-cos-sdk';

let SECRET_ID = "SECRETID"; // Permanent key secretId
let SECRET_KEY = "SECRETKEY"; // Permanent key secretKey

Cos.initWithPlainSecret(
  SECRET_ID,
  SECRET_KEY
)

    // The advanced download API supports resuming from breakpoints, so it initiates a HEAD request to obtain file information before downloading.
    // If you are using a temporary key or accessing with a sub-account, ensure that the permission list includes the HeadObject permission.

    // CosTransferManager supports resumable downloads; you only need to ensure the bucket, cosPath, and savePath
    // If the parameters are consistent, the SDK will resume downloading from the last position.

    // Obtain CosTransferManger
    let cosTransferManger: CosTransferManger = Cos.getDefaultTransferManger();
    //let cosTransferManger: CosTransferManger = Cos.getTransferManger(newRegion);
    // Bucket name in the format of bucketname-appid, where appid must be included. You can view the bucket name in the COS console: https://console.tencentcloud.com/cos5/bucket
    let bucket = "examplebucket-1250000000";
    let cosPath = "exampleobject"; // The location identifier of the object in the bucket, also known as the object key
    let downliadPath = "local file path"; // path to save the local file

    // Download success callback
    let successCallBack = (header?: object) => {
      // todo Download success follow-up logic
    };
    // Download failure callback
    let failCallBack = (clientError?: CosXmlClientError, serviceError?: CosXmlServiceError) => {
      // todo Download failure follow-up logic
      if (clientError) {
        console.log(clientError);
      }
      if (serviceError) {
        console.log(serviceError);
      }
    };
    // Download status callback, which allows you to view the task progress
    let stateCallBack = (state: TransferState) => {
      // todo notify transfer state
    };
    // Download progress callback
    let progressCallBack = (complete: number, target: number) => {
      // todo Do something to download progress...
    };

    // Start download
    let transferTask:TransferTask = await cosTransferManger.download(
      bucket,
      cosPath,
      downliadPath,
      {
        resultListener: {
          successCallBack: successCallBack,
          failCallBack: failCallBack
        },
        stateCallback: stateCallBack,
        progressCallback: progressCallBack,
        // Configure a single-use temporary key here; if not using the single-use temporary key method, do not pass this parameter
        sessionCredentials: sessionCredentials
      }
    );
    // Pause task
    //transferTask.pause();
    // Resume task
    //transferTask.resume();
    // Cancel task
    //transferTask.cancel();