thanhleviet
4/11/2016 - 3:15 AM

A flask server for serving all JPEG images in a local directory and subdirectories. Uses unveil.js for lazy-loading of images. Thumbnails

A flask server for serving all JPEG images in a local directory and subdirectories. Uses unveil.js for lazy-loading of images. Thumbnails are created on the fly by PIL.

server.py
content_copyfile_download
#!/bin/python

import os
from flask import Flask, Response, request, abort, render_template_string, send_from_directory
import Image
import StringIO

app = Flask(__name__)

WIDTH = 1000
HEIGHT = 800

TEMPLATE = '''
<!DOCTYPE html>
<html>
<head>
    <title></title>
    <meta charset="utf-8" />
    <style>
body {
    margin: 0;
    background-color: #333;
}

.image {
    display: block;
    margin: 2em auto;
    background-color: #444;
    box-shadow: 0 0 10px rgba(0,0,0,0.3);
}

img {
    display: block;
}
    </style>
    <script src="https://code.jquery.com/jquery-1.10.2.min.js" charset="utf-8"></script>
    <script src="http://luis-almeida.github.io/unveil/jquery.unveil.min.js" charset="utf-8"></script>
    <script>
$(document).ready(function() {
    $('img').unveil(1000);
});
    </script>
</head>
<body>
    {% for image in images %}
        <a class="image" href="{{ image.src }}" style="width: {{ image.width }}px; height: {{ image.height }}px">
            <img src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" data-src="{{ image.src }}?w={{ image.width }}&amp;h={{ image.height }}" width="{{ image.width }}" height="{{ image.height }}" />
        </a>
    {% endfor %}
</body>
'''

@app.route('/<path:filename>')
def image(filename):
    try:
        w = int(request.args['w'])
        h = int(request.args['h'])
    except (KeyError, ValueError):
        return send_from_directory('.', filename)

    try:
        im = Image.open(filename)
        im.thumbnail((w, h), Image.ANTIALIAS)
        io = StringIO.StringIO()
        im.save(io, format='JPEG')
        return Response(io.getvalue(), mimetype='image/jpeg')

    except IOError:
        abort(404)

    return send_from_directory('.', filename)

@app.route('/')
def index():
    images = []
    for root, dirs, files in os.walk('.'):
        for filename in [os.path.join(root, name) for name in files]:
            if not filename.endswith('.jpg'):
                continue
            im = Image.open(filename)
            w, h = im.size
            aspect = 1.0*w/h
            if aspect > 1.0*WIDTH/HEIGHT:
                width = min(w, WIDTH)
                height = width/aspect
            else:
                height = min(h, HEIGHT)
                width = height*aspect
            images.append({
                'width': int(width),
                'height': int(height),
                'src': filename
            })

    return render_template_string(TEMPLATE, **{
        'images': images
    })

if __name__ == '__main__':
    app.run(debug=True, host='::')