Fang-Pen Lin fangpenlin

Upload a file with $.ajax to AWS S3 with a pre-signed url

When you read about how to create and consume a pre-signed url on this guide, everything is really easy. You get your Postman and it works like a charm in the first run.

Then you open your browser, try your usual $.ajax() and send your PUT operation, and you hit the cold iced wall of AWS error message, a simple <Code>SignatureDoesNotMatch</Code> that will steal hours from your productivity.

So here I come to save you and give you a free working example of how to upload a file directly to AWS S3 from your browser. You are wellcome :).

If using Typescript to write a ReactNative Project in VSCode, you'll find that VSCode cannot stop at any breakpoint in TypeScript files. You must create breakpoints in JS files.

This post will answer why this problem appears and how to solve that.

Enviroment: VSCode (1.1.1 or 1.2.0) and ReactNative Tool Extension (0.1.4)

Solution Target: Debugger will work on break points in TypeScript files, in a ReactNative Project

Example Project structure:

	8/19/14 4:29:18.557 PM com.apple.CoreSimulator.CoreSimulatorService[22614]: Error Domain=com.apple.CoreSimulator.SimError Code=146 "Unable to lookup in current state: Shutdown" UserInfo=0x7f8e085107e0 {NSLocalizedDescription=Unable to lookup in current state: Shutdown}

	8/19/14 4:29:18.557 PM com.apple.CoreSimulator.CoreSimulatorService[22614]: Error Domain=com.apple.CoreSimulator.SimError Code=146 "Unable to lookup in current state: Shutdown" UserInfo=0x7f8e085107e0 {NSLocalizedDescription=Unable to lookup in current state: Shutdown}

	8/19/14 4:29:18.557 PM Xcode[52276]: [MT] iPhoneSimulator: Unable to connect to "com.apple.instruments.deviceservice.lockdown" (Error Domain=com.apple.CoreSimulator.SimError Code=146 "Unable to lookup in current state: Shutdown" UserInfo=0x7f8a3ad2c5b0 {NSLocalizedDescription=Unable to lookup in current state: Shutdown})

	8/19/14 4:29:18.957 PM com.apple.CoreSimulator.CoreSimulatorService[22614]: Error Domain=com.apple.CoreSimulator.SimError Code=142 "The iOS 8.0 simulator runt

	require 'spec_helper'

	describe "Homepage" do

	before :each do
	visit "/index.html"
	end

	it "has a title" do
	expect(page).to have_css("h1", text: "GitHub Help")

	"""
	Compile with gcc flag -mpopcnt
	"""
	import numpy as np
	cimport numpy as np
	cimport cython
	from libc.stdint cimport uint32_t, uint8_t

	cdef extern int __builtin_popcount(unsigned int) nogil

	defmodule MyApp do
	use Application

	def start(_type, _args) do
	import Supervisor.Spec, warn: false

	children = [
	Plug.Adapters.Cowboy.child_spec(:http, MyApp.Router, [], [
	dispatch: dispatch
	])

	extension UIImage {

	func fixedOrientation() -> UIImage {

	if imageOrientation == UIImageOrientation.Up {
	return self
	}

	var transform: CGAffineTransform = CGAffineTransformIdentity

	from pyramid.security import NO_PERMISSION_REQUIRED

	def includeme(config):
	config.add_directive(
	'add_cors_preflight_handler', add_cors_preflight_handler)
	config.add_route_predicate('cors_preflight', CorsPreflightPredicate)

	config.add_subscriber(add_cors_to_response, 'pyramid.events.NewResponse')

	class CorsPreflightPredicate(object):

	import * as React from 'react';
	import { Component } from 'react';

	export default function HOCBaseRender<Props, State, ComponentState>(
	Comp: new() => Component<Props & State, ComponentState>) {
	return class HOCBase extends Component<Props, State> {
	render() {
	return <Comp {...this.props} {...this.state}/>;
	}
	}

	"""
	Functions for computing the population count (aka Hamming weight) of an array
	in-place using the built-in popcount routine.
	Works with any integer datatype 64 bit-width or smaller.
	Compile with gcc flag -mpopcnt
	Adapted from
	https://gist.github.com/aldro61/f604a3fa79b3dec5436a by Alexandre Drouin
	"""
	import numpy as np
	cimport numpy as np