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From the Windows 98 and Internet examples in the preceding section, you learned that it is not advisable to retrofit software or communications protocols by adding security on afterward. It is advisable to design for security from the beginning. One way to start baking security into your software is to define concrete, measurable security goals in software requirements documents. Also, while we will touch upon the importance of security requirements and handling abuse cases through validation and fraud checks in this section, you are encouraged to read Gary McGraw s book, Software Security: Building Security In, for more depth on how to instrument your software development process to achieve security.

With the class and mapper changes set up, let s think about how you need to modify the page table and what fields you d like the section table to contain In SimpleSite, the section table doesn t need to hold any data other than an ID because all the attributes it needs are already inherited from the nav table The ID for a section has to be the same as the corresponding ID in the nav table so that SQLAlchemy knows how sections and navs are related This means the ID should be a foreign key Add the section table like this: section_table = saTable('section', metametadata, schemaColumn('id', typesInteger, schemaForeignKey('navid'), primary_key=True), ).

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Calling updateImages takes care of that Listing 13-9 Three simple slots void ImageDialog::nextClicked() { currentImage = (currentImage+1) % imageIdscount(); updateCurrentImage(); } uipreviousButton, SIGNAL(clicked()), this, SLOT(previousClicked()) ); uinextButton, SIGNAL(clicked()), this, SLOT(nextClicked()) ); uiaddTagButton, SIGNAL(clicked()), this, SLOT(addTagClicked()) ); uiaddImageButton, SIGNAL(clicked()), this, SLOT(addImageClicked()) ); uitagList, SIGNAL(itemSelectionChanged()), this, SLOT(tagsChanged()) );.

Note In this particular case, the attributes required suggest you could have simply created a Section object and had the Page inherit from it rather than having a separate Nav object and choosing that Section and Page inherit from it. The important point to be aware of is that you should also look at how objects you are modeling relate to each other in the real world as well as looking at how their attributes suggest they could be related. Pages aren t really like sections because they can t contain other pages and sections, so it is not wise to structure your model in a way that assumes they are.

void ImageDialog::previousClicked() { currentImage --; if( currentImage == -1 ) currentImage = imageIds.count()-1; updateCurrentImage(); } void ImageDialog::tagsChanged() { updateImages(); } The next slot, addTagClicked, can be seen in Listing 13-10. The slot is invoked when the user wants to add a tag to the current image. The slot starts by asking the user for a tag by showing a QInputDialog. If the user specifies a string, the text entered is converted to lowercase and is checked so that it meets the standards for a tag. In this case, that means that it consists of only the characters a z. No spaces, no special characters, no umlauts or other local characters; just a z. The actual check is performed using a regular expression. If the text is found to be an actual tag, ask the ImageCollection object images to add the tag to the current image. When the tag has been added, you need to update the tag list and call updateTags. Listing 13-10. Adding a tag to the current image void ImageDialog::addTagClicked() { bool ok; QString tag = QInputDialog::getText( this, tr("Image Book"), tr("Tag:"), QLineEdit::Normal, QString(), &ok ); if( ok ) { tag = tag.toLower(); QRegExp re( "[a-z]+" ); if( re.exactMatch(tag)) { QMessageBox::warning( this, tr("Image Book"), tr("This is not a valid tag. " "Tags consists of lower case characters a-z.") ); return; }

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