Beginning Python - From Novice to Professional

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CHAPTER 25 ■ PROJECT 6: REMOTE EDITING WITH CGI 475 text = form.getvalue('text', open('simple_edit.dat').read()) f = open('simple_edit.dat', 'w') f.write(text) f.close() print """Content-type: text/html A Simple Editor %s """ % text When accessed through a Web server, the CGI script checks for an input value called text. If such a value is submitted, the text is written to the file simple_edit.dat. The default value is the file’s current contents. Finally, a Web page (containing the field for editing and submitting the text) is shown. A screenshot of this page is shown in Figure 25-1. Figure 25-1. The simple_edit.cgi script in action
476 CHAPTER 25 ■ PROJECT 6: REMOTE EDITING WITH CGI Second Implementation Now that you’ve gotten the first prototype on the road, what’s missing? The system should be able to edit more than one file, and it should use password protection. (Because the document can be viewed by opening it directly in a browser, you won’t be paying much attention to the viewing part of the system.) The main difference from the first prototype is that you’ll split the functionality into several scripts—one for each “action” your system should be able to perform: index.html: This isn’t a script. It’s just a plain Web page with a form where you can enter a file name. It also has an Open button, which triggers edit.cgi. edit.cgi: Displays a given file in a text area; has a text field for password entry and a Save button, which triggers save.cgi. save.cgi: Saves the text it receives to a given file and displays a simple message (for example, “The file has been saved”). This script should also take care of the password checking. index.html The file index.html is an HTML file that contains the form used to enter a file name: File Editor File name: Note how the text field is named “filename”—that ensures its contents will be supplied as the CGI parameter filename to the edit.cgi script (which is the action attribute of the form tag). If you open this file in a browser, enter a file name in the text field, and click Open, the edit.cgi script will be run. edit.cgi The page displayed by edit.cgi should include a text area containing the current text of the file you’re editing, and a text field for entering a password. The only input needed is the file name, which the script receives from the form in index.html. Note, however, that it is fully possible to open the edit.cgi script directly, without submitting the form in index.html. In that case, you have no guarantee that the filename field of cgi.FieldStorage is set. So you have to add a check to ensure that there is a file name. If there is, the file will be opened from a directory that contains the files that may be edited. Let’s call the directory data. (You will, of course, have to create this directory.)
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Beginning Python From Novice to Pro
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For Ranveig
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■CHAPTER 23 Project 4: In the New
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viii ■CONTENTS Strings . . . . .
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x ■CONTENTS ■CHAPTER 5 Conditio
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xxii ■CONTENTS Preparations . . .
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About the Technical Reviewer ■JER
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Introduction A C program is like a
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256 CHAPTER 11 ■ FILES AND STUFF
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270 CHAPTER 12 ■ GRAPHICAL USER I
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298 CHAPTER 14 ■ NETWORK PROGRAMM
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314 CHAPTER 15 ■ PYTHON AND THE W
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358 CHAPTER 17 ■ EXTENDING PYTHON
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392 CHAPTER 20 ■ PROJECT 1: INSTA
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APPENDIX A ■ ■ ■ The Short Ve
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558 APPENDIX B ■ PYTHON REFERENCE
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572 APPENDIX C ■ ONLINE RESOURCES
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Index ■Symbols - operator 558 !=
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■INDEX 595 Python C API 365 hand-
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