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"""
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Our WSGI web interface, which can serve the JS UI and any .png tiles via HTTP.
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"""
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from werkzeug import Request, Response, responder
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from werkzeug import exceptions
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import os.path
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import pypngtile as pt
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DATA_ROOT = os.path.abspath('data')
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IMAGE_CACHE = {}
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TILE_WIDTH = 256
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TILE_HEIGHT = 256
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def image_view (req, image_path, image) :
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image_name = os.path.basename(image_path)
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return """\
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
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<head>
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<title>%(title)s</title>
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<script src="%(prefix)s/static/prototype.js" type="text/javascript"></script>
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<script src="%(prefix)s/static/dragdrop.js" type="text/javascript"></script>
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<script src="%(prefix)s/static/builder.js" type="text/javascript"></script>
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<script src="%(prefix)s/static/tiles2.js" type="text/javascript"></script>
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<link rel="Stylesheet" type="text/css" href="%(prefix)s/static/style.css">
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</head>
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<body>
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<div id="wrapper">
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<div id="viewport" style="width: 100%%; height: 100%%">
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<div class="substrate"></div>
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</div>
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</div>
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<script type="text/javascript">
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var tile_source = new Source("%(tile_url)s", %(tile_width)d, %(tile_height)d, 0, 0);
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var main = new Viewport(tile_source, "viewport");
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</script>
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</body>
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</html>""" % dict(
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title = image_name,
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prefix = os.path.dirname(req.script_root).rstrip('/'),
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tile_url = req.url,
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tile_width = TILE_WIDTH,
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tile_height = TILE_HEIGHT,
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)
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def render_tile (image, x, y) :
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return image.tile_mem(TILE_WIDTH, TILE_HEIGHT, x, y)
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def handle_main (req) :
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# path to image
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image = req.path.lstrip('/')
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# check a .png filename was given
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if not image or not image.endswith('.png') :
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raise exceptions.BadRequest("no .png path given")
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# build absolute path
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image_path = os.path.abspath(os.path.join(DATA_ROOT, image))
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# ensure the path points inside the data root
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if not image_path.startswith(DATA_ROOT) :
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raise exceptions.NotFound(image)
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# get Image object
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if image_path in IMAGE_CACHE :
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# get from cache
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image = IMAGE_CACHE[image_path]
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else :
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# ensure exists
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if not os.path.exists(image_path) :
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raise exceptions.NotFound(image)
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# cache
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image = IMAGE_CACHE[image_path] = pt.Image(image_path)
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# what view?
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if not req.args :
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# viewport
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return Response(image_view(req, image_path, image), content_type="text/html")
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elif 'x' in req.args and 'y' in req.args :
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# tile
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x = int(req.args['x'])
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y = int(req.args['y'])
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# yay render
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return Response(render_tile(image, x, y), content_type="image/png")
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else :
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raise exceptions.BadRequest("Unknown args")
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@responder
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def application (env, start_response) :
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req = Request(env, start_response)
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try :
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return handle_main(req)
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except exceptions.HTTPException, e :
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return e
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