main_upload.py

    # -*- coding: utf-8 -*-
import os
import time
import hashlib
import requests
import pytesseract
from pytesseract import image_to_string
from flask import Flask, render_template, redirect, url_for, request
from flask_uploads import UploadSet, configure_uploads, IMAGES, patch_request_class
from flask_wtf import FlaskForm
from flask_wtf.file import FileField, FileRequired, FileAllowed
from wtforms import SubmitField
from PIL import Image
from io import BytesIO
from google.cloud import vision
#pytesseract.pytesseract.tesseract_cmd = r'/home/sonwillogistics/env/lib/python3.5/site-packages/pytesseract/pytesseract.py'
app = Flask(__name__)
app.config['SECRET_KEY'] = 'I have a dream'
app.config['UPLOADED_PHOTOS_DEST'] = os.getcwd() + '/static'

photos = UploadSet('photos', IMAGES)
configure_uploads(app, photos)
patch_request_class(app)  # set maximum file size, default is 16MB


class UploadForm(FlaskForm):
    photo = FileField(validators=[FileAllowed(photos, u'Image Only!'), FileRequired(u'Choose a file!')])
    submit = SubmitField(u'Upload')


@app.route('/', methods=['GET', 'POST'])
def upload_file():
    form = UploadForm()
    if form.validate_on_submit():
        for filename in request.files.getlist('photo'):

            name = ('file' + str(time.time()))[:15]
            photos.save(filename, name=name + '.')
        success = True
    else:
        success = False
    return render_template('index.html', form=form, success=success)

@app.route('/scan/<filename>')
def scan_file(filename):
    file_url = photos.url(filename)
    response = requests.get(file_url)
    """Detects text in the file."""

    client = vision.ImageAnnotatorClient()

    with io.open(path, 'rb') as image_file:
        content = image_file.read()

    image = vision.types.Image(content=content)

    response = client.text_detection(image=image)
    texts = response.text_annotations


    for text in texts:
        print('\n"{}"'.format(text.description))

        vertices = (['({},{})'.format(vertex.x, vertex.y)
                    for vertex in text.bounding_poly.vertices])

        print('bounds: {}'.format(','.join(vertices)))

    render_template('index.html', file_text = texts)
@app.route('/manage')
def manage_file():
    files_list = os.listdir(app.config['UPLOADED_PHOTOS_DEST'])
    return render_template('manage.html', files_list=files_list)


@app.route('/open/<filename>')
def open_file(filename):

    file_url = photos.url(filename)
    response = requests.get(file_url)
    img = Image.open(BytesIO(response.content))
    file_text = image_to_string(img)
    return render_template('browser.html', file_url=file_url, file_text=file_text)


@app.route('/delete/<filename>')
def delete_file(filename):
    file_path = photos.path(filename)
    os.remove(file_path)
    return redirect(url_for('manage_file'))


if __name__ == '__main__':
    app.run()