contrib/tnitter/src/action.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Copyright 2014 Alexis Laferrière <alexis.laf@xymus.net>
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at
   8 #
   9 #     http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 # View and controller of Tnitter
  18 module action
  19
  20 import nitcorn
  21
  22 import model
  23
  24 redef class Session
  25         # User logged in
  26         var user: nullable String = null
  27 end
  28
  29 # Main Tnitter Action
  30 class Tnitter
  31         super Action
  32
  33         var db_path = "tnitter.db"
  34         var db = new DB.open(db_path)
  35
  36         # Header on pages served by this `Action`
  37         #
  38         # Keywords to `Text::replace`:
  39         # * `%app_path%` is the main URL to reach this `Action`
  40         # * `%nav_right%` is the pulled right part of the header, used for login form
  41         var header = """
  42 <nav class="navbar navbar-default" role="navigation">
  43   <div class="container-fluid">
  44     <div class="navbar-header">
  45       <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
  46         <span class="sr-only">Toggle navigation</span>
  47                 <span class="icon-bar"></span>
  48                 <span class="icon-bar"></span>
  49                 <span class="icon-bar"></span>
  50       </button>
  51       <a class="navbar-brand" href="%app_path%">Tnitter</a>
  52     </div>
  53
  54     <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
  55       <ul class="nav navbar-nav">
  56         <li><a href="https://github.com/privat/nit/">Nit repository</a></li>
  57       </ul>
  58
  59       <ul class="nav navbar-nav pull-right">
  60 %header_right%
  61       </ul>
  62     </div>
  63   </div>
  64 </nav>"""
  65
  66         # Template of the pages served by this `Action`
  67         #
  68         # Keywords to `Text::replace`:
  69         # * The `%header%`, first thing in the `<body>`
  70         # * The main page `%content%` within a `<div class="container">`
  71         var template = """
  72 <!DOCTYPE html>
  73 <html>
  74 <head>
  75         <title>Tnitter</title>
  76         <meta charset="utf-8">
  77         <meta http-equiv="X-UA-Compatible" content="IE=edge">
  78         <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
  79
  80         <link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
  81         <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
  82         <script src="//netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
  83 </head>
  84 <body>
  85
  86 %header%
  87
  88 <div class="container">
  89         %content%
  90 </div>
  91 </body>
  92 </html>"""
  93
  94         redef fun answer(request, turi)
  95         do
  96                 # Get existing session
  97                 var session = request.session
  98
  99                 # Error to display on page as a dismissable panel
 100                 var error = null
 101
 102                 # Login/logout
 103                 if turi == "/login" and request.post_args.keys.has("user") and
 104                    request.post_args.keys.has("pass") then
 105
 106                         var user = request.post_args["user"].trim
 107                         var pass = request.post_args["pass"]
 108
 109                         var original_user = db.check_login(user, pass)
 110                         if original_user != null then
 111                                 # Log in successful
 112                                 if session == null then session = new Session
 113                                 session.user = original_user
 114                         else
 115                                 # Check for basic requirements
 116                                 if user.is_empty then
 117                                         error = "Username must have at least 1 character"
 118                                 else if user.chars.has(' ') or user.chars.has('\n') then
 119                                         error = "Username cannot contain white spaces"
 120                                 else if db.sign_up(user, pass) then
 121                                         # Sign up successful
 122                                         if session == null then session = new Session
 123                                         session.user = user
 124                                 else
 125                                         # Invalid user/pass
 126                                         error = "Invalid combination of username and password"
 127                                         session = null
 128                                 end
 129                         end
 130                 else if turi == "/logout" then
 131                         # Logging out
 132                         session = null
 133                 else if turi == "/post" and request.post_args.keys.has("text") and session != null then
 134                         var user = session.user
 135                         if user != null then
 136                                 # Post a Tnit!
 137                                 var text = request.post_args["text"]
 138                                 db.post(user, text)
 139
 140                                 # Redirect the user to avoid double posting
 141                                 var response = new HttpResponse(303)
 142                                 response.header["Location"] = request.uri
 143                                 return response
 144                         end
 145                 end
 146
 147                 var login_or_out
 148                 var content
 149                 if session == null or session.user == null then
 150                         # Log in form in the navbar
 151                         login_or_out = """
 152 <li>
 153 <form class="navbar-form" role="form" action="login" method="POST">
 154   <div class="form-group">
 155     <input type="text" placeholder="Username" class="form-control" name="user">
 156   </div>
 157   <div class="form-group">
 158     <input type="password" placeholder="Password" class="form-control" name="pass">
 159   </div>
 160   <button type="submit" class="btn btn-default">Log in (or sign up)</button>
 161 </form>
 162 </li>
 163                         """
 164
 165                         # Cannot post when not logged in
 166                         content = ""
 167                 else
 168                         # Log out form in the navbar
 169                         login_or_out = """
 170 <li><p class="navbar-text">Signed in as @{{{session.user.html_escape}}}</p></li>
 171 <li>
 172 <form class="navbar-form" role="form" action="logout" method="POST">
 173   <button type="submit" class="btn btn-default">Log out</button>
 174 </form>
 175 </li>
 176                         """
 177
 178                         # Post form
 179                         content = """
 180 <form class="form" role="form" action="post" method="POST">
 181   <div class="form-group">
 182         <div class="input-group">
 183            <div class="input-group-addon">Share your thoughts</div>
 184            <input class="form-control" type="text" placeholder="..." name="text">
 185            <span class="input-group-btn">
 186                   <button class="btn btn-default" type="submit">Tnit!</button>
 187            </span>
 188         </div><!-- /input-group -->
 189   </div>
 190 </form>
 191                         """
 192                 end
 193
 194                 # Show error if any
 195                 var error_html
 196                 if error != null then
 197                         error_html = """
 198 <div class="alert alert-danger alert-dismissible" role="alert">
 199   <button type="button" class="close" data-dismiss="alert"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
 200   {{{error}}}
 201 </div>
 202                 """
 203                 else error_html = ""
 204
 205                 # Load the last 16 Tnits
 206                 var posts = db.latest_posts(16)
 207
 208                 var html_posts = new Array[String]
 209                 for post in posts do
 210                         html_posts.add "<tr><td>@{post.user.html_escape}</td><td>{post.text.html_escape}</td></tr>"
 211                 end
 212
 213                 content += """
 214 <div class="panel panel-default">
 215   <div class="panel-heading">Latest Tnits</div>
 216     <table class="table table-striped">
 217       {{{html_posts.join("\n")}}}
 218     </table>
 219   </div>
 220 </div>
 221                 """
 222
 223                 # Get page from template, we replace the header first so we can replace
 224                 # everything on the same body afterwards
 225                 var body = template.
 226                         replace("%header%", header).
 227                         replace("%app_path%", request.uri.strip_extension(turi) + "/").
 228                         replace("%header_right%", login_or_out).
 229                         replace("%content%", error_html + content)
 230
 231                 # Build response
 232                 var response = new HttpResponse(200)
 233                 response.body = body
 234                 response.session = session
 235                 return response
 236         end
 237 end