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import Image
from StringIO import StringIO
from glob import glob
import os
import cgi

base_template = """<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<style>
body {
  font-family: "Lucida Grande", Verdana, "Bitstream Vera Sans", "Lucida Sans Unicode", sans-serif;
  background-color: gray;
  }
#directories {
  background-color: white;
  margin: 10px;
  padding: 5px;
  border: 1px solid black;
  }
#pictures {
  background-color: white;
  margin:10px;
  padding: 5px;
  border: 1px solid black;
  }
a.directory {
  margin: 5px;
  }
img {
  margin: 5px;
  }
</style>
<title>Real Basic Gallery</title>
</head>
<body>
<h1>Real Basic Gallery</h1>
%s
</body>
</html>
"""

class fsPicture(object):
    def __init__(self, root, template=base_template):
        self.template = template
        self.root = root

    def split_path_from_item(self, item):
        """removes the root directory from the path.  This lets us use the result as a
        web path."""
        return "/" + item.replace(self.root, '')

    def directory_listing(self, directory, path):
        """returns html for a directory listing"""
        files = ""
        directories = ""
        for item in glob(directory + "/*"):
            web_path = self.split_path_from_item(item)
            if os.path.isdir(item):
                directories += """<div class="directory"><a href="%s" class="directory">%s</a></div>""" % (web_path, web_path)
            elif os.path.isfile(item) and item.lower().endswith('.jpg'):
                files += """<div class="image">
                <img src="%s?thumbnail=200"><br/><a href="%s">%s</a></div>""" % (web_path, web_path, web_path)
        html = ""
        if directories:
            html += """<h2>Directories</h2><div id="directories">%s</div>""" % directories
        if files:
            html +=  """<h2>Pictures</h2><div id="pictures">%s</div>""" % files
        return html

    def picture(self, image, path):
        """returns raw binary image.  If query string of "thumbnail" is passed to the app
        the image is resized to a maximum of the argument.  For instance:
        /some_image.jpg?thumbnail=100"""
        i = Image.open(image)
        if self.query_string:
            try:
                size = cgi.parse_qs(self.query_string)
                size = size['thumbnail'][0]
                i.thumbnail((int(size), int(size)))
            except:
                pass
        s = StringIO()
        i.save(s, 'JPEG')
        return s.getvalue()

    def find_object(self, path):
        """finds the directory or picture referenced, returns the response and the mimetype"""
        item = os.path.join(self.root, *path.split('/'))
        if os.path.isdir(item):
            return ([self.template % self.directory_listing(item, path),], 'text/html')
        elif os.path.isfile(item) and item.lower().endswith('.jpg'):
            return ([self.picture(item, path),], 'image/jpeg')
        else:
            return ([self.template % 'not found'], 'text/html')

    def __call__(self, environ, start_response):
        """the entry point to the application"""
        self.query_string = environ.get('QUERY_STRING', False)
        response, mimetype = self.find_object(environ['PATH_INFO'])
        start_response('200 OK', [('content-type',mimetype)])
        return response
        
if __name__ == '__main__':
    from paste import httpserver, session
    import sys
    HERE = os.path.abspath(os.path.dirname(__file__))
    if len(sys.argv) > 1:
        picture_base = sys.argv[1]
    else:
        picture_base = os.path.join(HERE, '..', 'test_base/')
    print "serving from %s" % picture_base
    app = fsPicture(picture_base)
    httpserver.serve(app, host='127.0.0.1', port='8080')

Change log

r11 by chris.mcavoy on Mar 1, 2008   Diff 
added a few docstrings
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Older revisions

r10 by chris.mcavoy on Mar 1, 2008   Diff 
some final bug fixes
r9 by chris.mcavoy on Feb 25, 2008   Diff 
the basics of the app are working, it
needs some css TLC though
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