Introducción CGI
De WikiEducator
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(Cap. 4 de Real Python for the Web, de Michael Herman)
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Tip:
- Para los ejercicios usaremos CGIHTTPServer
python -m CGIHTTPServer
- Los programas cgi estarán en un subdirectorio cgi-bin
- Esos programas tienen que estar identificados como programas python
#!/usr/bin/env python
- Tienen que tener permisos de ejecución
$ chmos +x <programa_cgi.py>
#!/usr/bin/env python import BaseHTTPServer import CGIHTTPServer import cgitb; cgitb.enable() ## Para mostrar errores CGI server = BaseHTTPServer.HTTPServer handler = CGIHTTPServer.CGIHTTPRequestHandler server_address = ("", 8000) handler.cgi_directories = [""] ## En qué directorios puede haber programas CGI httpd = server(server_address, handler) httpd.serve_forever()
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<form enctype="multipart/form-data" action="save_file.py" method="post"> <p>File: <input type="file" name="filename" /></p> <p><input type="submit" value="Upload" /></p> </form> #!/usr/bin/python import cgi, os import cgitb; cgitb.enable() form = cgi.FieldStorage() # Get filename here. fileitem = form['filename'] # Test if the file was uploaded if fileitem.filename: # strip leading path from file name to avoid # directory traversal attacks fn = os.path.basename(fileitem.filename) open('/tmp/' + fn, 'wb').write(fileitem.file.read()) message = 'The file "' + fn + '" was uploaded successfully' else: message = 'No file was uploaded' print """\ Content-Type: text/html\n <html> <body> <p>%s</p> </body> </html> """ % (message,)
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#!/usr/bin/env python # HTTP Header print 'Content-Type:application/octet-stream; name="FileName"\n' print 'Content-Disposition: attachment; filename="FileName"\n\n' # Actual File Content will go hear. fo = open("foo.txt", "rb") str = fo.read(); print str # Close opend file fo.close()
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Tip: CGI scripts run by the CGIHTTPRequestHandler class cannot execute redirects (HTTP code 302), because code 200 (script output follows) is sent prior to execution of the CGI script. This pre-empts the status code. http://docs.python.org/2/library/cgihttpserver.html
