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Jan 5th, 2016
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  1. #
  2. # DB Forum - a buggy web forum server backed by a good database
  3. #
  4.  
  5. # The forumdb module is where the database interface code goes.
  6. import forumdb
  7.  
  8. # Other modules used to run a web server.
  9. import cgi
  10. from wsgiref.simple_server import make_server
  11. from wsgiref import util
  12.  
  13. # HTML template for the forum page
  14. HTML_WRAP = '''\
  15. <!DOCTYPE html>
  16. <html>
  17.  <head>
  18.    <title>DB Forum</title>
  19.    <style>
  20.      h1, form { text-align: center; }
  21.      textarea { width: 400px; height: 100px; }
  22.      div.post { border: 1px solid #999;
  23.                 padding: 10px 10px;
  24.          margin: 10px 20%%; }
  25.      hr.postbound { width: 50%%; }
  26.      em.date { color: #999 }
  27.    </style>
  28.  </head>
  29.  <body>
  30.    <h1>DB Forum</h1>
  31.    <form method=post action="/post">
  32.      <div><textarea id="content" name="content"></textarea></div>
  33.      <div><button id="go" type="submit">Post message</button></div>
  34.    </form>
  35.    <!-- post content will go here -->
  36. %s
  37.  </body>
  38. </html>
  39. '''
  40.  
  41. # HTML template for an individual comment
  42. POST = '''\
  43.    <div class=post><em class=date>%(time)s</em><br>%(content)s</div>
  44. '''
  45.  
  46. ## Request handler for main page
  47. def View(env, resp):
  48.     '''View is the 'main page' of the forum.
  49.  
  50.    It displays the submission form and the previously posted messages.
  51.    '''
  52.     # get posts from database
  53.     posts = forumdb.GetAllPosts()
  54.     # send results
  55.     headers = [('Content-type', 'text/html')]
  56.     resp('200 OK', headers)
  57.     return [HTML_WRAP % ''.join(POST % p for p in posts)]
  58.  
  59. ## Request handler for posting - inserts to database
  60. def Post(env, resp):
  61.     '''Post handles a submission of the forum's form.
  62.  
  63.    The message the user posted is saved in the database, then it sends a 302
  64.    Redirect back to the main page so the user can see their new post.
  65.    '''
  66.     # Get post content
  67.     input = env['wsgi.input']
  68.     length = int(env.get('CONTENT_LENGTH', 0))
  69.     # If length is zero, post is empty - don't save it.
  70.     if length > 0:
  71.         postdata = input.read(length)
  72.         fields = cgi.parse_qs(postdata)
  73.         content = fields['content'][0]
  74.         # If the post is just whitespace, don't save it.
  75.         content = content.strip()
  76.         if content:
  77.             # Save it in the database
  78.             forumdb.AddPost(content)
  79.     # 302 redirect back to the main page
  80.     headers = [('Location', '/'),
  81.                ('Content-type', 'text/plain')]
  82.     resp('302 REDIRECT', headers)
  83.     return ['Redirecting']
  84.  
  85. ## Dispatch table - maps URL prefixes to request handlers
  86. DISPATCH = {'': View,
  87.             'post': Post,
  88.         }
  89.  
  90. ## Dispatcher forwards requests according to the DISPATCH table.
  91. def Dispatcher(env, resp):
  92.     '''Send requests to handlers based on the first path component.'''
  93.     page = util.shift_path_info(env)
  94.     if page in DISPATCH:
  95.         return DISPATCH[page](env, resp)
  96.     else:
  97.         status = '404 Not Found'
  98.         headers = [('Content-type', 'text/plain')]
  99.         resp(status, headers)    
  100.         return ['Not Found: ' + page]
  101.  
  102.  
  103. # Run this bad server only on localhost!
  104. httpd = make_server('', 8000, Dispatcher)
  105. print "Serving HTTP on port 8000..."
  106. httpd.serve_forever()
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