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Let s now look at the source code of the ImageDialog class, starting from the constructor and user actions (The code run before the dialog is shown, the constructor, can be seen in Listing 13-8) It starts by setting up the user interface generated from the Designer file When the widgets are in place, it initializes currentImage to an invalid value to ensure that no image is visible before updating the tag list and the images to be shown When this is done, the connections are made Each button s clicked signal is connected to a corresponding slot The tag list s itemSelectionChanged signal is connected to the tagsChanged slot Listing 13-8 The constructor of the ImageDialog class ImageDialog::ImageDialog() { uisetupUi( this ); currentImage = -1; updateTags(); updateImages(); connect( connect( connect( connect( connect( } Remember that the updateCurrentImage method disables the Next, Previous, and Add Tag buttons.

nav_table = schemaTable('nav', metametadata, schemaColumn('id', typesInteger(), schemaSequence('nav_id_seq', optional=True), primary_key=True), schemaColumn('name', typesUnicode(255), default=u'Untitled Node'), schemaColumn('path', typesUnicode(255), default=u''), schemaColumn('section', typesInteger(), schemaForeignKey('navid')), schemaColumn('before', typesInteger(), default=None), schemaColumn('type', typesString(30), nullable=False) ) You will still want to be able to work with page and section objects in the model, so you ll need to use SQLAlchemy s powerful inheritance tools so that the Page and Section classes inherit information from a Nav class Replace the existing Page class with these three classes: class Nav(object): pass class Page(Nav): pass class Section(Nav): pass You ll also need a new mapper for the Nav class, and you ll need to tell SQLAlchemy that Page and Section will inherit from Nav and therefore should also have all the same properties a Nav object would have.

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To issue such a request, you can launch your web broswer and type http://localhost: 8080/index.html into the address bar of your browser to have it access the index.html default home page on the web server.5 You can even put your own files and directories in the web server s root directory and access them from your browser. That is where the good news ends. SimpleWebServer, like much software today, was written just to do its job. It was not written to do its job safely or securely, and you will see just how bad it is. As we progress through this chapter, we will identify and correct a number of SimpleWebServer s vulnerabilities. We will also use it as a running example to illustrate many of the points we make about how it should have been designed and developed!

Here s what the updated mappers look like: ormmapper(Comment, comment_table) ormmapper(Tag, tag_table) ormmapper(Nav, nav_table, polymorphic_on=nav_tablectype, polymorphic_identity='nav') ormmapper(Section, section_table, inherits=Nav, polymorphic_identity='section') ormmapper(Page, page_table, inherits=Nav, polymorphic_identity='page', properties={ 'comments':ormrelation(Comment, backref='page', cascade='all'), 'tags':ormrelation(Tag, secondary=pagetag_table) }) The important points to notice are that the Nav mapper specifies that Nav is polymorphic on nav_tablectype, in other words, that the type column will contain a string to specify whether the record is a page or a section The Section and Page mappers then specify that they inherit from Nav and specify the text to be used in the nav table s type column to identify them Now would be a good time to make these changes to your model if you haven t already done so.

The updateCurrentImage method is called from updateImages, which is called from the constructor This means that if the Next, Previous, or Add Tag buttons are clicked, there is a current image Looking at the slots, notice that three of them are fairly simple (see their implementations in Listing 13-9) First up is the pair nextClicked and previousClicked As discussed earlier, the currentImage variable acts as an index into the imageIds list of id values When a user clicks the Next button, the currentImage value is increased If the value is too large, it starts at zero again The same goes for the Previous button The value is decreased and starts from the other end of the list when needed The last simple slot is the tagsChanged slot, which is reached if the selection of tags is changed If they are changed, you need to get a new list of images.

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