SignatureDoesNotMatch error when uploading to s3 via a pre signed url using Ionic 2

Question

I am trying to upload a video to s3 and have a pre-signed PUT url. The following is the code to do so.

import {Component} from '@angular/core';
import {NavController} from 'ionic-angular';
import {MediaCapture} from 'ionic-native';
import {Http} from '@angular/http';
import { Transfer } from 'ionic-native';

@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})

export class HomePage {

    public base64Image: string;

    constructor(private navController: NavController, public http: Http) {
        this.base64Image = "https://placehold.it/150x150";
    }

    public takeVideo() {
        MediaCapture.captureVideo({limit:2}).then(function(videoData){
            var link = "https://mysamplebucket.s3.amazonaws.com/non-tp/esx.mov?AWSAccessKeyId=TEMP_KEYY&Expires=1482290587&Signature=JUIHHI%2FcnLkqSVg%3D&x-amz-security-token=FQoDYXDGRfTXk6hma0Rxew6yraAX%2FlYGaQmYLwkvsuuB3%2F%2FtPvGDVs3dIQG0Ty3MeMjn0p%%26djt5xhAMk73pndJbZP0tCYYlvPvlUAyL8x7O%%2B3AwEa%%2B9b43yarIuPLCvujmKLTDyi%%3D%3Di";

            var options: any;

            options = {
             fileKey: 'file',
             fileName: 'esx.mov',
             httpMethod: 'PUT',
             chunkedMode: false,
             mimeType: 'video/quicktime',
             encodeURI: false,
             headers: {
                'Content-Type': 'video/quicktime'
              }
            };

            var ft = new Transfer();
            ft.upload(videoData[0].fullPath, link, options, false)
                .then((result: any) => {
                    this.success(result);
                }).catch((error: any) => {
                    this.failed(error);
                }); 

        }, function(err){
            alert(err);
        });
    }


}

Here is the code that generates the pre-signed PUT url.

var params = {Bucket: s3_bucket, Key: filename, Expires: 900000};
var url = { 
    'url' : s3.getSignedUrl('putObject', params)
};

I get, SignatureDoesNotMatch error. The message says, The request signature we calculated does not match the signature you provided. Check your key and signing method. I am not sure what I am doing wrong here - I looked a few other SO and Ionic questions and tried what they recommended to no avail. Any ideas on what I and doing wrong?

Answer 1

Your upload PUT request will have a Content-Type: video/quicktime header.

When the Content-Type header is present in the request (not the response), its value is a non-optional component in the Signature V2 canonical request... which means you have to pass it to the code generating the signature.

var params = {Bucket: s3_bucket, Key: filename, Expires: 900000}; also needs this string (video/quicktime, in this case) passed to it as ContentType: ... for a PUT request (but not for a GET request, since this describes the content you are sending, and GET requests customarily send no actual content.

The SDK documentation doesn't seem to specifically mention this, but it is most definitely required by S3.