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Then add this new template to the templates directory as uploadform.html: <%inherit file="/base.html" /> <h1>Upload a File</h1> ${h.form(h.url_for(controller='upload', action='upload'), multipart=True)} Upload file: ${h.file('myfile')} <br /> Description: ${h.text('description')} <br /> ${h.submit('submit', 'Submit')} ${h.end_form()} If you visit http://localhost:5000/upload/index, you should see the form. Now let s think about how to handle the upload. When a file upload has succeeded, the request.POST (or request.params) MultiDict will contain a cgi.FieldStorage object as the value of the field. FieldStorage objects have three important attributes for file uploads: filename: This is the name of the file uploaded as it appeared on the uploader s filesystem. file: This is a Python tempfile object from which the file can be read. For example: data = request.params['myfile'].file.read() value: This is the content of the uploaded file, eagerly read directly from the file object. The easiest way to gain access to the file s data is via the value attribute, which returns the entire contents of the file: def upload(self): myfile = request.POST['myfile'] return "Successfully uploaded: %s, size: %i, description: %s" % ( myfile.filename, len(myfile.value), request.POST['description'] ) However, reading the entire contents of the file into memory is undesirable, especially for large file uploads. A common means of handling file uploads is to store the file somewhere on the filesystem. The FieldStorage instance already reads the file onto the filesystem; however, it s to a nonpermanent location, via a Python tempfile object. Here s an example that uses shutil.copyfileobj to perform an efficient copy of the temp file s data to a permanent location specified by the permanent_store variable in the config file: def upload(self): myfile = request.POST['myfile'] permanent_file = open( os.path.join( config['app_conf']['permanent_store'], myfile.filename.replace(os.sep, '_') ), 'wb' ) shutil.copyfileobj(myfile.file, permanent_file) myfile.file.close() permanent_file.close()

QVector<QPoint> linePoints; foreach( QPoint point, polyPoints ) linePoints << point + QPoint( 80, 0 ); painter.drawLine( QPoint( 10, 10 ), QPoint( 30, 90 ) ); painter.drawPolyline( polyPoints ); painter.drawLines( linePoints );

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return 'Successfully uploaded: %s, description: %s' % ( myfile.filename, request.POST['description'] ) For this example to work, you ll need to add some imports at the top of the file: import os from pylons import config import shutil You ll also need to edit the development.ini config file and add this to the end of the [app:main] section: permanent_store = %(here)s/data/uploads You ll remember from the discussion of config files in 3 that %(here)s is replaced with the location of the config file, so this example would upload files to the project s data directory used as a cache for templates and sessions. You ll need to create the uploads directory within the data directory because it won t exist yet.

If our ISP (Internet service provider) charges us per volume of traffic to and from our web server, we may want to limit inclusion of our resources (images, script, style sheets, etc.) into third-party sites simply for cost reasons. In this case, it would be sufficient to implement an incomplete solution that works most of the time, but still ensures that legitimate users are not negatively affected. To implement this solution, we would decline to serve requests with a Referer header indicating that the request did not originate from one of our sites. However, we would serve requests that do not have a Referer header at all.

Figure 7-4. Lines drawn using different methods; from left to right: drawLine, drawPolylines, and drawLines (two lines)

This basic example allows any file uploaded to overwrite any file in the permanent_store directory to which your web application has permissions. Also note the use of myfile.filename.replace(os.sep, '_') to ensure that the file name doesn t start with a / character. This is a simple security measure to help prevent specially crafted file names resulting in other files on your system being overwritten. You should always be suspicious of all data coming from a user s web browser and take appropriate steps to try to ensure that the data is safe.

Namely, the attacker knows that there is some word that is repeated many times in the plaintext. We would ideally like the entire encrypted document to look like a completely random string, such that the probability that any particular bit in the encrypted document is a 0 or 1 is 1/2. Before examining another mode in which we can encrypt with a block cipher, we first review how a bit operation called XOR works. For those of you who have studied digital logic or discrete math, you have probably seen XOR before. XOR (short for exclusive or ) is a binary operator that takes two bits, X and Y, as input, and produces a single bit of output. Table 12-1 presents the truth table for XOR (which is represented by the symbol ). If exactly one of the two inputs to XOR is 1, the output of XOR is 1. The output of XOR is 0 otherwise. Table 12-1. Truth Table for XOR ( )

Now that you can handle files being uploaded to the server, you might also want to provide a way for your users to download those files again. First you ll need to import the mimetypes module to guess the content type of the file, so you should add the following import to the top of your controller: from mimetypes import guess_type You can then provide the download with an action like this: def download(self): requested_filename = request.params['requested_filename'] filename = os.path.join( config['app_conf']['permanent_store'], requested_filename.replace(os.sep, '_') ) if not os.path.exists(filename): return 'No such file' permanent_file = open(filename, 'rb') data = permanent_file.read() permanent_file.close() response.content_type = guess_type(filename)[0] or 'text/plain' return data You can test this by uploading a text file called somefile and then visiting the URL http://localhost:5000/upload/download requested_filename=somefile. The example so far will correctly send the file to the browser, but the browser will try to display it if it is a type it recognizes such as a JPEG or a PNG file. If you want to force the browser to download the file as an attachment, you can add another HTTP header to the response like this just before you return the data:

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