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uploadPicture = () => {
  return fetch(SERVER_URL, {
    body: JSON.stringify({
      image: this.state.photo.base64
    }),
    headers: {
      'content-type': 'application/json'
    },
    method: 'POST'
  })

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const express = require('express');
const bodyParser = require('body-parser');

const app = express();

// If your phone has a modern camera (unlike my iPhone 4S)
// you might wanna make this bigger.
app.use(bodyParser.json({ limit: '10mb' }));

// TODO: handle requests

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// View latest image
app.get('/', (req, res) => {
  // Does this session have an image yet?
  if(!latestPhoto) {
    return res.status(404).send("Nothing here yet");
  }

  console.log('sending photo');

  try {

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takePicture = () => {
  this.camera.takePictureAsync({
    quality: 0.1,
    base64: true,
    exif: false
  }).then(photo => {
    this.setState({ photo });

    // In 27 seconds, turn the camera back on
    setTimeout(() => {

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class Autoshoot extends React.Component {
  state = {
    photo: null
  }

  ...
}

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class Autoshoot extends React.Component {
  render() {
    return (
      <View style={{ flex: 1, width: '100%' }}>
        <Camera
          style={{ flex: 1 }}
          type={Camera.Constants.Type.back}
          ref={cam => this.camera = cam}>
        </Camera>
      </View>

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import React from 'react';
import { StyleSheet, Text, View } from 'react-native';

export default class App extends React.Component {
  render() {
    return (
      <View style={styles.container}>
        <Text>Open up App.js to start working on your app!</Text>
      </View>
    );

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takePicture = () => {
  this.camera.takePictureAsync({
    quality: 0.1,
    base64: true,
    exif: false
  }).then(photo => {
    this.setState({ photo });
  })
}

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// Here's the timer code, lifted from takePicture:
queuePhoto = () => {
  // In 27 seconds, turn the camera back on
  setTimeout(() => {
    this.setState({ photo: null });
  }, PHOTO_INTERVAL - FOCUS_TIME);

  // In 30 seconds, take the next picture
  setTimeout(this.takePicture, PHOTO_INTERVAL);
}

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import React from 'react';
import { StyleSheet, Text, View } from 'react-native';

// add this:
import { Camera, Permissions } from 'expo';

export default class App extends React.Component {
  // initialize state
  state = {
    cameraPermission: null