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One big problem with a database of users and passwords is that anyone who can get access to the database can see all of the passwords. Because many people tend to reuse the same passwords on multiple web sites, this can pose a significant security risk. To help you protect your users, Django avoids storing the plain password that the user will actually use to log in. Instead, Django uses a mathematical trick called a hash function, which transforms the password into a random-looking (but not actually random) string of letters and numbers. That result is then stored in the database instead of the actual password. The advantage is that a hash function only works one way: if you know the password, you can apply the hash function and always get the same result, but if you only know the result, you can t work backward to get the password. This provides a reasonably secure way to store passwords. When you try to log in, Django s authentication system applies the hash function to the password you ve entered and compares the result to the value in the database. This means that the plain password never has to be permanently stored anywhere. But because this system is a bit tricky to work with, Django s User model has a custom manager that defines the create_user() method you re using here. This method handles the work of applying the hash function to the password and storing the correct value.

Each file lists its current revision, how long ago that revision was made, who made it, and the changelog entry for it. Let s take a closer look at Makefile.am, a file I explained how to create earlier in this chapter. Clicking on the revision number shows the syntax-highlighted content of that revision, as seen in Figure 3-10. Clicking the filename will show the full history of the file, shown in Figure 3-11.

class SignupForm(forms.Form): username = forms.CharField(max_length=30) email = forms.EmailField() password1 = forms.CharField(max_length=30, widget=forms.PasswordInput(render_value=False)) password2 = forms.CharField(max_length=30, widget=forms.PasswordInput(render_value=False)) def clean_username(self): try: User.objects.get(username=self.cleaned_data['username']) except User.DoesNotExist: return self.cleaned_data['username'] raise forms.ValidationError("This username is already in use. Please choose another.") def clean(self): if 'password1' in self.cleaned_data and 'password2' in self.cleaned_data: if self.cleaned_data['password1'] != self.cleaned_data['password2']: raise forms.ValidationError("You must type the same password each time") return self.cleaned_data def save(self): new_user = User.objects.create_user(username=self.cleaned_data['username'], email=self.cleaned_data['email'], password=self.cleaned_data['password1']) return new_user

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Note Database and listener availability monitoring as well as session monitoring is available in the EM 10g Grid Control Diagnostics Pack. There are many other third-party tools that can assist with this level of monitoring as well.

Figure 3-11. The full history of Makefile.am In Figure 3-11, you see a list of each commit that affected Makefile.am. Each entry in the list contains the revision number, the date and time it was committed, who committed it, what branch the commit was to, what tags apply to it, and a link to show a patch to the previous revision. Patches in ViewCVS are slightly easier to read than they are in a typical text editor; they re colorcoded to show you exactly what s been removed, added, and modified. The patch between revision 1.56 and 1.57 of Makefile.am is shown in Figure 3-12.

GTK+ Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

The method you ll use in views to determine whether or not submitted data is valid is called is_valid(), and it s defined on the base Form class that all Django forms derive from. Inside the Form class, is_valid() touches off the form s validation routines, in a specific order, by calling full_clean() (another method defined in the base Form class in django.forms; see Figure 9-1).

By monitoring for database storage issues, the Applications DBA can typically resolve space constraints before users encounter failures. The Applications DBA should proactively monitor the following storage conditions:

Overview of GTK+ 113 History 113 Architecture 115 Language Bindings 117 Anatomy of a GTK+ Application 117 The gtk_init() Function 118 The Main Loop 119 User Interface Principles 120 Elegance 120 GNOME HIG 120.

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