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The create() action needs to perform the following tasks: Validate the form Redisplay it with error messages if any data is invalid Add the valid data to the database Redirect the user to the newly created page Let s start by creating a FormEncode schema to validate the data submitted. You need to import formencode at the top of the page controller and then import htmlfill, which will be used by the edit() method later in the chapter: import formencode from formencode import htmlfill Next define the schema, which looks like this: class NewPageForm(formencode.Schema): allow_extra_fields = True filter_extra_fields = True content = formencode.validators.String( not_empty=True, messages={ 'empty':'Please enter some content for the page.' } ) heading = formencode.validators.String() title = formencode.validators.String(not_empty=True)

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Figure 15-4. Mutual authentication in SSL If RSA is to be used for key agreement, the client transmits a ClientKeyExchange message to the server, just as in the server-authenticated-only case, but then sends a CertificateVerify message to the server containing the client s signature on all handshake messages, starting from the ClientHello message up to (but not including) the CertificateVerify message. After the appropriate Certificate, ClientKeyExchange, and CertificateVerify messages are sent by the client as needed, the pre-master secret is set. The master secret is then computed from the pre-master secret, and the client and server transmit the ChangeCipherSpec and Finished messages. Both parties can then start exchanging application data encrypted with the master secret. Much thought has gone into the design of SSL, and its mechanisms prevent a large variety of attacks. For instance, a man-in-the-middle may try splicing in and replaying data from previous sessions in an attempt to take over a conversation, or a malicious client may attempt to coerce a server into using weaker encryption algorithms by claiming it does not support

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Setting the allow_extra_fields and filter_extra_fields options to True means that FormEncode won t raise Invalid exceptions for fields such as the Create Page button, which aren t listed in the schema, but will filter them out so that they don t affect the results You ll notice that title and content are required fields because they have not_empty=True specified You ll also notice that the content field has a customized error message so that if no text is entered, the error Please enter some content for the page will be displayed Notice also that although you specified not_empty=True in the formencodevalidatorsString validator, the key corresponding to the message is the string 'empty' This might catch you out if you expected the key to be 'not_empty'.

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Lists are good for keeping things, but sometimes it is interesting to associate things, this is where maps and hashes enter the picture Let s start by having a look at the QMap class, which enables you to keep items in key-value pairs For example, you can associate a value to a string, as shown in Listing 1-19 When you create a QMap, the template arguments are the type of key and then the type of values Listing 1-19 Creating a map associating strings with integers and filling it with information QMap<QString, int> map; map["foo"] = 42; map["bar"] = 13; map["baz"] = 9; To insert a new item in a map, all you have to do is assign it with the [] operator If the key already exists, the new item replaces the existing one If the key is new to the map, a new item is created.

newer ones. In addition to defending against such attacks, SSL supports various performance optimizations for example, once a client and server have successfully completed a handshake, they can cache security parameters that they have already negotiated and resume a previous conversation without having to redo a full handshake even if they initiate a new TCP connection. If you require authentication, confidentiality, and/or message integrity between a client and server, you should strongly consider reusing SSL instead of attempting to build a protocol of your own.

To handle the validation and redisplay of the form if there are any errors, you ll use the @validate decorator you learned about in 4 This requires another import: from pylonsdecorators import validate You want it to redisplay the result of calling the new() action if an error occurs, so this is how you use it: @validate(schema=NewPageForm(), form='new') def create(self): .. Calling an action wrapped by @validate using a GET request will bypass the validation and call the action anyway You need to make sure this doesn t pose a security risk in your application You could prevent this by testing whether a GET or a POST is being used in the body of the action You can determine the request method using requestmethod, or Pylons provides another decorator called @restrict that you can use.

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