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1 | =head1 NAME |
2 | |
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3 | Catalyst::Manual::Tutorial::05_Authentication - Catalyst Tutorial - Chapter 5: Authentication |
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4 | |
5 | |
6 | =head1 OVERVIEW |
7 | |
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8 | This is B<Chapter 5 of 10> for the Catalyst tutorial. |
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9 | |
10 | L<Tutorial Overview|Catalyst::Manual::Tutorial> |
11 | |
12 | =over 4 |
13 | |
14 | =item 1 |
15 | |
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16 | L<Introduction|Catalyst::Manual::Tutorial::01_Intro> |
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17 | |
18 | =item 2 |
19 | |
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20 | L<Catalyst Basics|Catalyst::Manual::Tutorial::02_CatalystBasics> |
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21 | |
22 | =item 3 |
23 | |
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24 | L<More Catalyst Basics|Catalyst::Manual::Tutorial::03_MoreCatalystBasics> |
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25 | |
26 | =item 4 |
27 | |
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28 | L<Basic CRUD|Catalyst::Manual::Tutorial::04_BasicCRUD> |
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29 | |
30 | =item 5 |
31 | |
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32 | B<05_Authentication> |
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33 | |
34 | =item 6 |
35 | |
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36 | L<Authorization|Catalyst::Manual::Tutorial::06_Authorization> |
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37 | |
38 | =item 7 |
39 | |
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40 | L<Debugging|Catalyst::Manual::Tutorial::07_Debugging> |
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41 | |
42 | =item 8 |
43 | |
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44 | L<Testing|Catalyst::Manual::Tutorial::08_Testing> |
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45 | |
46 | =item 9 |
47 | |
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48 | L<Advanced CRUD|Catalyst::Manual::Tutorial::09_AdvancedCRUD> |
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49 | |
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50 | =item 10 |
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51 | |
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52 | L<Appendices|Catalyst::Manual::Tutorial::10_Appendices> |
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53 | |
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54 | =back |
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55 | |
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56 | |
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57 | =head1 DESCRIPTION |
58 | |
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59 | Now that we finally have a simple yet functional application, we can |
60 | focus on providing authentication (with authorization coming next in |
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61 | Chapter 6). |
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62 | |
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63 | This chapter of the tutorial is divided into two main sections: 1) basic, |
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64 | cleartext authentication and 2) hash-based authentication. |
65 | |
66 | You can checkout the source code for this example from the catalyst |
67 | subversion repository as per the instructions in |
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68 | L<Catalyst::Manual::Tutorial::01_Intro|Catalyst::Manual::Tutorial::01_Intro>. |
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69 | |
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70 | |
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71 | =head1 BASIC AUTHENTICATION |
72 | |
73 | This section explores how to add authentication logic to a Catalyst |
74 | application. |
75 | |
76 | |
77 | =head2 Add Users and Roles to the Database |
78 | |
79 | First, we add both user and role information to the database (we will |
80 | add the role information here although it will not be used until the |
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81 | authorization section, Chapter 6). Create a new SQL script file by opening |
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82 | C<myapp02.sql> in your editor and insert: |
83 | |
84 | -- |
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85 | -- Add user and role tables, along with a many-to-many join table |
d442cc9f |
86 | -- |
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87 | PRAGMA foreign_keys = ON; |
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88 | CREATE TABLE user ( |
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89 | id INTEGER PRIMARY KEY, |
90 | username TEXT, |
91 | password TEXT, |
92 | email_address TEXT, |
93 | first_name TEXT, |
94 | last_name TEXT, |
95 | active INTEGER |
96 | ); |
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97 | CREATE TABLE role ( |
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98 | id INTEGER PRIMARY KEY, |
99 | role TEXT |
100 | ); |
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101 | CREATE TABLE user_role ( |
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102 | user_id INTEGER REFERENCES user(id) ON DELETE CASCADE ON UPDATE CASCADE, |
103 | role_id INTEGER REFERENCES role(id) ON DELETE CASCADE ON UPDATE CASCADE, |
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104 | PRIMARY KEY (user_id, role_id) |
105 | ); |
106 | -- |
107 | -- Load up some initial test data |
108 | -- |
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109 | INSERT INTO user VALUES (1, 'test01', 'mypass', 't01@na.com', 'Joe', 'Blow', 1); |
110 | INSERT INTO user VALUES (2, 'test02', 'mypass', 't02@na.com', 'Jane', 'Doe', 1); |
111 | INSERT INTO user VALUES (3, 'test03', 'mypass', 't03@na.com', 'No', 'Go', 0); |
112 | INSERT INTO role VALUES (1, 'user'); |
113 | INSERT INTO role VALUES (2, 'admin'); |
114 | INSERT INTO user_role VALUES (1, 1); |
115 | INSERT INTO user_role VALUES (1, 2); |
116 | INSERT INTO user_role VALUES (2, 1); |
117 | INSERT INTO user_role VALUES (3, 1); |
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118 | |
119 | Then load this into the C<myapp.db> database with the following command: |
120 | |
121 | $ sqlite3 myapp.db < myapp02.sql |
122 | |
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123 | |
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124 | =head2 Add User and Role Information to DBIC Schema |
125 | |
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126 | Although we could manually edit the DBIC schema information to include |
127 | the new tables added in the previous step, let's use the C<create=static> |
128 | option on the DBIC model helper to do most of the work for us: |
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129 | |
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130 | $ script/myapp_create.pl model DB DBIC::Schema MyApp::Schema \ |
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131 | create=static components=TimeStamp dbi:SQLite:myapp.db \ |
132 | on_connect_do="PRAGMA foreign_keys = ON" |
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133 | exists "/root/dev/MyApp/script/../lib/MyApp/Model" |
134 | exists "/root/dev/MyApp/script/../t" |
135 | Dumping manual schema for MyApp::Schema to directory /root/dev/MyApp/script/../lib ... |
136 | Schema dump completed. |
137 | exists "/root/dev/MyApp/script/../lib/MyApp/Model/DB.pm" |
138 | $ |
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139 | $ ls lib/MyApp/Schema/Result |
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140 | Author.pm BookAuthor.pm Book.pm Role.pm User.pm UserRole.pm |
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141 | |
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142 | Notice how the helper has added three new table-specific Result Source |
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143 | files to the C<lib/MyApp/Schema/Result> directory. And, more |
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144 | importantly, even if there were changes to the existing result source |
145 | files, those changes would have only been written above the C<# DO NOT |
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146 | MODIFY THIS OR ANYTHING ABOVE!> comment and your hand-edited |
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147 | enhancements would have been preserved. |
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148 | |
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149 | Speaking of "hand-editted enhancements," we should now add the |
150 | C<many_to_many> relationship information to the User Result Source file. |
151 | As with the Book, BookAuthor, and Author files in |
152 | L<Chapter 3|Catalyst::Manual::Tutorial::03_MoreCatalystBasics>, |
153 | L<DBIx::Class::Schema::Loader|DBIx::Class::Schema::Loader> has |
154 | automatically created the C<has_many> and C<belongs_to> relationships |
155 | for the new User, UserRole, and Role tables. However, as a convenience |
156 | for mapping Users to their assigned roles (see |
157 | L<Chapter 6|Catalyst::Manual::Tutorial::06_Authorization>), we will |
158 | also manually add a C<many_to_many> relationship. Edit |
159 | C<lib/MyApp/Schema/Result/User.pm> add the following information between |
160 | the C<# DO NOT MODIFY THIS OR ANYTHING ABOVE!> comment and the closing |
161 | C<1;>: |
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162 | |
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163 | # many_to_many(): |
164 | # args: |
165 | # 1) Name of relationship, DBIC will create accessor with this name |
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166 | # 2) Name of has_many() relationship this many_to_many() is shortcut for |
167 | # 3) Name of belongs_to() relationship in model class of has_many() above |
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168 | # You must already have the has_many() defined to use a many_to_many(). |
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169 | __PACKAGE__->many_to_many(roles => 'user_roles', 'role'); |
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170 | |
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171 | The code for this update is obviously very similar to the edits we made |
172 | to the C<Book> and C<Author> classes created in Chapter 3 with one |
173 | exception: we only defined the C<many_to_many> relationship in one |
174 | direction. Whereas we felt that we would want to map Authors to Books |
175 | B<AND> Books to Authors, here we are only adding the convenience |
176 | C<many_to_many> in the Users to Roles direction. |
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177 | |
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178 | Note that we do not need to make any change to the |
179 | C<lib/MyApp/Schema.pm> schema file. It simply tells DBIC to load all |
180 | of the Result Class and ResultSet Class files it finds in below the |
181 | C<lib/MyApp/Schema> directory, so it will automatically pick up our |
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182 | new table information. |
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183 | |
184 | |
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185 | =head2 Sanity-Check of the Development Server Reload |
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186 | |
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187 | We aren't ready to try out the authentication just yet; we only want to |
188 | do a quick check to be sure our model loads correctly. Assuming that you |
189 | are following along and using the "-r" option on C<myapp_server.pl>, |
190 | then the development server should automatically reload (if not, press |
191 | C<Ctrl-C> to break out of the server if it's running and then enter |
192 | C<script/myapp_server.pl> to start it). Look for the three new model |
193 | objects in the startup debug output: |
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194 | |
195 | ... |
196 | .-------------------------------------------------------------------+----------. |
197 | | Class | Type | |
198 | +-------------------------------------------------------------------+----------+ |
199 | | MyApp::Controller::Books | instance | |
200 | | MyApp::Controller::Root | instance | |
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201 | | MyApp::Model::DB | instance | |
202 | | MyApp::Model::DB::Author | class | |
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203 | | MyApp::Model::DB::Book | class | |
204 | | MyApp::Model::DB::BookAuthor | class | |
205 | | MyApp::Model::DB::Role | class | |
206 | | MyApp::Model::DB::User | class | |
207 | | MyApp::Model::DB::UserRole | class | |
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208 | | MyApp::View::HTML | instance | |
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209 | '-------------------------------------------------------------------+----------' |
210 | ... |
211 | |
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212 | Again, notice that your "Result Class" classes have been "re-loaded" |
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213 | by Catalyst under C<MyApp::Model>. |
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214 | |
215 | |
216 | =head2 Include Authentication and Session Plugins |
217 | |
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218 | Edit C<lib/MyApp.pm> and update it as follows (everything below |
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219 | C<StackTrace> is new): |
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220 | |
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221 | # Load plugins |
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222 | use Catalyst qw/ |
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223 | -Debug |
224 | ConfigLoader |
225 | Static::Simple |
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226 | |
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227 | StackTrace |
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228 | |
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229 | Authentication |
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230 | |
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231 | Session |
232 | Session::Store::FastMmap |
233 | Session::State::Cookie |
234 | /; |
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235 | |
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236 | B<Note:> As discussed in MoreCatalystBasics, different versions of |
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237 | C<Catalyst::Devel> have used a variety of methods to load the plugins, |
238 | but we are going to use the current Catalyst 5.8X practice of putting |
239 | them on the C<use Catalyst> line. |
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240 | |
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241 | The C<Authentication> plugin supports Authentication while the |
242 | C<Session> plugins are required to maintain state across multiple HTTP |
243 | requests. |
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244 | |
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245 | Note that the only required Authentication class is the main one. This |
246 | is a change that occurred in version 0.09999_01 of the |
247 | C<Authentication> plugin. You B<do not need> to specify a particular |
248 | Authentication::Store or Authentication::Credential plugin. Instead, |
249 | indicate the Store and Credential you want to use in your application |
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250 | configuration (see below). |
251 | |
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252 | Make sure you include the additional plugins as new dependencies in |
253 | the Makefile.PL file something like this: |
254 | |
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255 | requires 'Catalyst::Plugin::Authentication'; |
256 | requires 'Catalyst::Plugin::Session'; |
257 | requires 'Catalyst::Plugin::Session::Store::FastMmap'; |
258 | requires 'Catalyst::Plugin::Session::State::Cookie'; |
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259 | |
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260 | Note that there are several options for |
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261 | L<Session::Store|Catalyst::Plugin::Session::Store>. |
262 | L<Session::Store::Memcached|Catalyst::Plugin::Session::Store::Memcached> or |
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263 | L<Session::Store::FastMmap|Catalyst::Plugin::Session::Store::FastMmap> is |
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264 | generally a good choice if you are on Unix. If you are running on |
265 | Windows, try |
266 | L<Session::Store::File|Catalyst::Plugin::Session::Store::File>. Consult |
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267 | L<Session::Store|Catalyst::Plugin::Session::Store> and its subclasses |
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268 | for additional information and options (for example to use a database- |
269 | backed session store). |
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270 | |
271 | |
272 | =head2 Configure Authentication |
273 | |
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274 | There are a variety of ways to provide configuration information to |
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275 | L<Catalyst::Plugin::Authentication|Catalyst::Plugin::Authentication>. |
276 | Here we will use |
277 | L<Catalyst::Authentication::Realm::SimpleDB|Catalyst::Authentication::Realm::SimpleDB> |
278 | because it automatically sets a reasonable set of defaults for us. Open |
279 | C<lib/MyApp.pm> and place the following text above the call to |
280 | C<__PACKAGE__-E<gt>setup();>: |
281 | |
282 | # Configure SimpleDB Authentication |
283 | __PACKAGE__->config->{'Plugin::Authentication'} = { |
284 | default => { |
285 | class => 'SimpleDB', |
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286 | user_model => 'DB::User', |
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287 | password_type => 'clear', |
288 | }, |
289 | }; |
290 | |
291 | We could have placed this configuration in C<myapp.conf>, but placing |
292 | it in C<lib/MyApp.pm> is probably a better place since it's not likely |
293 | something that users of your application will want to change during |
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294 | deployment (or you could use a mixture: leave C<class> and |
295 | C<user_model> defined in C<lib/MyApp.pm> as we show above, but place |
296 | C<password_type> in C<myapp.conf> to allow the type of password to be |
297 | easily modified during deployment). We will stick with putting |
298 | all of the authentication-related configuration in C<lib/MyApp.pm> |
299 | for the tutorial, but if you wish to use C<myapp.conf>, just convert |
300 | to the following code: |
301 | |
302 | <Plugin::Authentication> |
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303 | <default> |
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304 | password_type clear |
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305 | user_model DB::User |
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306 | class SimpleDB |
307 | </default> |
308 | </Plugin::Authentication> |
309 | |
310 | B<TIP:> Here is a short script that will dump the contents of |
311 | C<MyApp->config> to L<Config::General|Config::General> format in |
312 | C<myapp.conf>: |
313 | |
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314 | $ CATALYST_DEBUG=0 perl -Ilib -e 'use MyApp; use Config::General; |
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315 | Config::General->new->save_file("myapp.conf", MyApp->config);' |
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316 | |
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317 | B<HOWEVER>, if you try out the command above, be sure to delete the |
318 | "myapp.conf" command. Otherwise, you will wind up with duplicate |
319 | configurations. |
320 | |
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321 | B<NOTE:> Because we are using SimpleDB along with a database layout |
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322 | that complies with its default assumptions: we don't need to specify |
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323 | the names of the columns where our username and password information |
324 | is stored (hence, the "Simple" part of "SimpleDB"). That being said, |
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325 | SimpleDB lets you specify that type of information if you need to. |
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326 | Take a look at |
327 | C<Catalyst::Authentication::Realm::SimpleDB|Catalyst::Authentication::Realm::SimpleDB> |
328 | for details. |
329 | |
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330 | |
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331 | =head2 Add Login and Logout Controllers |
332 | |
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333 | Use the Catalyst create script to create two stub controller files: |
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334 | |
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335 | $ script/myapp_create.pl controller Login |
336 | $ script/myapp_create.pl controller Logout |
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337 | |
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338 | You could easily use a single controller here. For example, you could |
339 | have a C<User> controller with both C<login> and C<logout> actions. |
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340 | Remember, Catalyst is designed to be very flexible, and leaves such |
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341 | matters up to you, the designer and programmer. |
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342 | |
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343 | Then open C<lib/MyApp/Controller/Login.pm>, locate the |
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344 | C<sub index :Path :Args(0)> method (or C<sub index : Private> if you |
345 | are using an older version of Catalyst) that was automatically |
346 | inserted by the helpers when we created the Login controller above, |
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347 | and update the definition of C<sub index> to match: |
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348 | |
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349 | =head2 index |
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350 | |
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351 | Login logic |
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352 | |
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353 | =cut |
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354 | |
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355 | sub index :Path :Args(0) { |
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356 | my ($self, $c) = @_; |
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357 | |
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358 | # Get the username and password from form |
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359 | my $username = $c->request->params->{username}; |
360 | my $password = $c->request->params->{password}; |
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361 | |
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362 | # If the username and password values were found in form |
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363 | if ($username && $password) { |
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364 | # Attempt to log the user in |
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365 | if ($c->authenticate({ username => $username, |
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366 | password => $password } )) { |
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367 | # If successful, then let them use the application |
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368 | $c->response->redirect($c->uri_for( |
369 | $c->controller('Books')->action_for('list'))); |
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370 | return; |
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371 | } else { |
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372 | # Set an error message |
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373 | $c->stash(error_msg => "Bad username or password."); |
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374 | } |
ab0bd0bb |
375 | } else { |
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376 | # Set an error message |
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377 | $c->stash(error_msg => "Empty username or password."); |
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378 | } |
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379 | |
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380 | # If either of above don't work out, send to the login page |
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381 | $c->stash(template => 'login.tt2'); |
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382 | } |
383 | |
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384 | Be sure to remove the |
385 | C<$c-E<gt>response-E<gt>body('Matched MyApp::Controller::Login in Login.');> |
386 | line of the C<sub index>. |
387 | |
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388 | This controller fetches the C<username> and C<password> values from the |
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389 | login form and attempts to authenticate the user. If successful, it |
390 | redirects the user to the book list page. If the login fails, the user |
391 | will stay at the login page and receive an error message. If the |
392 | C<username> and C<password> values are not present in the form, the |
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393 | user will be taken to the empty login form. |
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394 | |
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395 | Note that we could have used something like "C<sub default :Path>", |
396 | however, it is generally recommended (partly for historical reasons, |
397 | and partly for code clarity) only to use C<default> in |
398 | C<MyApp::Controller::Root>, and then mainly to generate the 404 not |
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399 | found page for the application. |
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400 | |
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401 | Instead, we are using "C<sub somename :Path :Args(0) {...}>" here to |
402 | specifically match the URL C</login>. C<Path> actions (aka, "literal |
403 | actions") create URI matches relative to the namespace of the |
404 | controller where they are defined. Although C<Path> supports |
405 | arguments that allow relative and absolute paths to be defined, here |
406 | we use an empty C<Path> definition to match on just the name of the |
407 | controller itself. The method name, C<index>, is arbitrary. We make |
408 | the match even more specific with the C<:Args(0)> action modifier -- |
409 | this forces the match on I<only> C</login>, not |
410 | C</login/somethingelse>. |
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411 | |
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412 | Next, update the corresponding method in |
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413 | C<lib/MyApp/Controller/Logout.pm> to match: |
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414 | |
415 | =head2 index |
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416 | |
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417 | Logout logic |
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418 | |
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419 | =cut |
efdaddec |
420 | |
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421 | sub index :Path :Args(0) { |
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422 | my ($self, $c) = @_; |
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423 | |
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424 | # Clear the user's state |
425 | $c->logout; |
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426 | |
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427 | # Send the user to the starting point |
428 | $c->response->redirect($c->uri_for('/')); |
429 | } |
430 | |
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431 | As with the login controller, be sure to delete the |
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432 | C<$c-E<gt>response-E<gt>body('Matched MyApp::Controller::Logout in Logout.');> |
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433 | line of the C<sub index>. |
434 | |
435 | |
436 | =head2 Add a Login Form TT Template Page |
437 | |
438 | Create a login form by opening C<root/src/login.tt2> and inserting: |
439 | |
440 | [% META title = 'Login' %] |
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441 | |
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442 | <!-- Login form --> |
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443 | <form method="post" action="[% c.uri_for('/login') %]"> |
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444 | <table> |
445 | <tr> |
446 | <td>Username:</td> |
447 | <td><input type="text" name="username" size="40" /></td> |
448 | </tr> |
449 | <tr> |
450 | <td>Password:</td> |
451 | <td><input type="password" name="password" size="40" /></td> |
452 | </tr> |
453 | <tr> |
454 | <td colspan="2"><input type="submit" name="submit" value="Submit" /></td> |
455 | </tr> |
456 | </table> |
457 | </form> |
458 | |
459 | |
460 | =head2 Add Valid User Check |
461 | |
462 | We need something that provides enforcement for the authentication |
463 | mechanism -- a I<global> mechanism that prevents users who have not |
464 | passed authentication from reaching any pages except the login page. |
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465 | This is generally done via an C<auto> action/method in |
466 | C<lib/MyApp/Controller/Root.pm>. |
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467 | |
468 | Edit the existing C<lib/MyApp/Controller/Root.pm> class file and insert |
469 | the following method: |
470 | |
471 | =head2 auto |
efdaddec |
472 | |
d442cc9f |
473 | Check if there is a user and, if not, forward to login page |
efdaddec |
474 | |
d442cc9f |
475 | =cut |
efdaddec |
476 | |
d442cc9f |
477 | # Note that 'auto' runs after 'begin' but before your actions and that |
905a3a26 |
478 | # 'auto's "chain" (all from application path to most specific class are run) |
d442cc9f |
479 | # See the 'Actions' section of 'Catalyst::Manual::Intro' for more info. |
ddfbd850 |
480 | sub auto :Private { |
d442cc9f |
481 | my ($self, $c) = @_; |
efdaddec |
482 | |
d442cc9f |
483 | # Allow unauthenticated users to reach the login page. This |
191dee29 |
484 | # allows unauthenticated users to reach any action in the Login |
d442cc9f |
485 | # controller. To lock it down to a single action, we could use: |
486 | # if ($c->action eq $c->controller('Login')->action_for('index')) |
905a3a26 |
487 | # to only allow unauthenticated access to the 'index' action we |
d442cc9f |
488 | # added above. |
489 | if ($c->controller eq $c->controller('Login')) { |
490 | return 1; |
491 | } |
efdaddec |
492 | |
d442cc9f |
493 | # If a user doesn't exist, force login |
494 | if (!$c->user_exists) { |
495 | # Dump a log message to the development server debug output |
496 | $c->log->debug('***Root::auto User not found, forwarding to /login'); |
497 | # Redirect the user to the login page |
498 | $c->response->redirect($c->uri_for('/login')); |
499 | # Return 0 to cancel 'post-auto' processing and prevent use of application |
500 | return 0; |
501 | } |
efdaddec |
502 | |
d442cc9f |
503 | # User found, so return 1 to continue with processing after this 'auto' |
504 | return 1; |
505 | } |
506 | |
636ba9f7 |
507 | As discussed in |
3ab6187c |
508 | L<Catalyst::Manual::Tutorial::03_MoreCatalystBasics/CREATE A CATALYST CONTROLLER>, |
636ba9f7 |
509 | every C<auto> method from the application/root controller down to the |
510 | most specific controller will be called. By placing the |
511 | authentication enforcement code inside the C<auto> method of |
512 | C<lib/MyApp/Controller/Root.pm> (or C<lib/MyApp.pm>), it will be |
513 | called for I<every> request that is received by the entire |
0416017e |
514 | application. |
d442cc9f |
515 | |
516 | |
517 | =head2 Displaying Content Only to Authenticated Users |
518 | |
519 | Let's say you want to provide some information on the login page that |
520 | changes depending on whether the user has authenticated yet. To do |
521 | this, open C<root/src/login.tt2> in your editor and add the following |
522 | lines to the bottom of the file: |
523 | |
acbd7bdd |
524 | ... |
d442cc9f |
525 | <p> |
526 | [% |
905a3a26 |
527 | # This code illustrates how certain parts of the TT |
d442cc9f |
528 | # template will only be shown to users who have logged in |
529 | %] |
8a7c5151 |
530 | [% IF c.user_exists %] |
531 | Please Note: You are already logged in as '[% c.user.username %]'. |
532 | You can <a href="[% c.uri_for('/logout') %]">logout</a> here. |
d442cc9f |
533 | [% ELSE %] |
534 | You need to log in to use this application. |
535 | [% END %] |
536 | [%# |
537 | Note that this whole block is a comment because the "#" appears |
905a3a26 |
538 | immediate after the "[%" (with no spaces in between). Although it |
539 | can be a handy way to temporarily "comment out" a whole block of |
540 | TT code, it's probably a little too subtle for use in "normal" |
d442cc9f |
541 | comments. |
542 | %] |
3533daff |
543 | </p> |
d442cc9f |
544 | |
545 | Although most of the code is comments, the middle few lines provide a |
546 | "you are already logged in" reminder if the user returns to the login |
547 | page after they have already authenticated. For users who have not yet |
548 | authenticated, a "You need to log in..." message is displayed (note the |
549 | use of an IF-THEN-ELSE construct in TT). |
550 | |
551 | |
552 | =head2 Try Out Authentication |
553 | |
3c700304 |
554 | The development server should have reloaded each time we edited one of |
555 | the Controllers in the previous section. Now trying going to |
556 | L<http://localhost:3000/books/list> and you should be redirected to the |
557 | login page, hitting Shift+Reload or Ctrl+Reload if necessary (the "You |
558 | are already logged in" message should I<not> appear -- if it does, click |
559 | the C<logout> button and try again). Note the C<***Root::auto User not |
560 | found...> debug message in the development server output. Enter username |
561 | C<test01> and password C<mypass>, and you should be taken to the Book |
562 | List page. |
d442cc9f |
563 | |
636ba9f7 |
564 | B<IMPORTANT NOTE:> If you are having issues with authentication on |
565 | Internet Explorer, be sure to check the system clocks on both your |
566 | server and client machines. Internet Explorer is very picky about |
acbd7bdd |
567 | timestamps for cookies. You can quickly sync a Debian system by |
568 | installing the "ntpdate" package: |
569 | |
570 | sudo aptitude -y install ntpdate |
571 | |
572 | And then run the following command: |
25ed8f40 |
573 | |
acbd7bdd |
574 | sudo ntpdate-debian |
d442cc9f |
575 | |
acbd7bdd |
576 | Or, depending on your firewall configuration: |
577 | |
578 | sudo ntpdate-debian -u |
579 | |
636ba9f7 |
580 | Note: NTP can be a little more finicky about firewalls because it uses |
acbd7bdd |
581 | UDP vs. the more common TCP that you see with most Internet protocols. |
582 | Worse case, you might have to manually set the time on your development |
583 | box instead of using NTP. |
1390ef0e |
584 | |
d442cc9f |
585 | Open C<root/src/books/list.tt2> and add the following lines to the |
3533daff |
586 | bottom (below the closing </table> tag): |
d442cc9f |
587 | |
aa7ff325 |
588 | ... |
d442cc9f |
589 | <p> |
8a7c5151 |
590 | <a href="[% c.uri_for('/login') %]">Login</a> |
0416017e |
591 | <a href="[% c.uri_for(c.controller.action_for('form_create')) %]">Create</a> |
d442cc9f |
592 | </p> |
593 | |
905a3a26 |
594 | Reload your browser and you should now see a "Login" and "Create" links |
595 | at the bottom of the page (as mentioned earlier, you can update template |
3c700304 |
596 | files without a development server reload). Click the first link |
905a3a26 |
597 | to return to the login page. This time you I<should> see the "You are |
d442cc9f |
598 | already logged in" message. |
599 | |
600 | Finally, click the C<You can logout here> link on the C</login> page. |
601 | You should stay at the login page, but the message should change to "You |
602 | need to log in to use this application." |
603 | |
604 | |
605 | =head1 USING PASSWORD HASHES |
606 | |
efdaddec |
607 | In this section we increase the security of our system by converting |
608 | from cleartext passwords to SHA-1 password hashes that include a |
609 | random "salt" value to make them extremely difficult to crack with |
610 | dictionary and "rainbow table" attacks. |
d442cc9f |
611 | |
612 | B<Note:> This section is optional. You can skip it and the rest of the |
613 | tutorial will function normally. |
614 | |
fbbb9084 |
615 | Be aware that even with the techniques shown in this section, the browser |
d442cc9f |
616 | still transmits the passwords in cleartext to your application. We are |
617 | just avoiding the I<storage> of cleartext passwords in the database by |
efdaddec |
618 | using a salted SHA-1 hash. If you are concerned about cleartext passwords |
d442cc9f |
619 | between the browser and your application, consider using SSL/TLS, made |
efdaddec |
620 | easy with the Catalyst plugin Catalyst::Plugin:RequireSSL. |
d442cc9f |
621 | |
622 | |
efdaddec |
623 | =head2 Re-Run the DBIC::Schema Model Helper to Include DBIx::Class::EncodedColumn |
d442cc9f |
624 | |
efdaddec |
625 | Next, we can re-run the model helper to have it include |
626 | L<DBIx::Class::EncodedColumn|DBIx::Class::EncodedColumn> in all of the |
627 | Result Classes it generates for us. Simply use the same command we |
628 | saw in Chapters 3 and 4, but add C<,EncodedColumn> to the C<components> |
629 | argument: |
d442cc9f |
630 | |
efdaddec |
631 | $ script/myapp_create.pl model DB DBIC::Schema MyApp::Schema \ |
b66dd084 |
632 | create=static components=TimeStamp,EncodedColumn dbi:SQLite:myapp.db \ |
633 | on_connect_do="PRAGMA foreign_keys = ON" |
d442cc9f |
634 | |
efdaddec |
635 | If you then open one of the Result Classes, you will see that it |
636 | includes EncodedColumn in the C<load_components> line. Take a look at |
3b1fa91b |
637 | C<lib/MyApp/Schema/Result/User.pm> since that's the main class where we |
efdaddec |
638 | want to use hashed and salted passwords: |
639 | |
e12f8011 |
640 | __PACKAGE__->load_components("InflateColumn::DateTime", "TimeStamp", "EncodedColumn"); |
efdaddec |
641 | |
642 | |
643 | =head2 Modify the "password" Column to Use EncodedColumn |
644 | |
3b1fa91b |
645 | Open the file C<lib/MyApp/Schema/Result/User.pm> and enter the following |
efdaddec |
646 | text below the "# DO NOT MODIFY THIS OR ANYTHING ABOVE!" line but above |
647 | the closing "1;": |
648 | |
649 | # Have the 'password' column use a SHA-1 hash and 10-character salt |
650 | # with hex encoding; Generate the 'check_password" method |
651 | __PACKAGE__->add_columns( |
652 | 'password' => { |
efdaddec |
653 | encode_column => 1, |
654 | encode_class => 'Digest', |
655 | encode_args => {salt_length => 10}, |
656 | encode_check_method => 'check_password', |
657 | }, |
658 | ); |
659 | |
660 | This redefines the automatically generated definition for the password |
661 | fields at the top of the Result Class file to now use EncodedColumn |
662 | logic (C<encoded_column> is set to 1). C<encode_class> can be set to |
663 | either C<Digest> to use |
664 | L<DBIx::Class::EncodedColumn::Digest|DBIx::Class::EncodedColumn::Digest>, |
665 | or C<Crypt::Eksblowfish::Bcrypt> for |
666 | L<DBIx::Class::EncodedColumn::Crypt::Eksblowfish::Bcrypt|DBIx::Class::EncodedColumn::Crypt::Eksblowfish::Bcrypt>. |
667 | C<encode_args> is then used to customize the type of Digest you |
668 | selected. Here we only specified the size of the salt to use, but |
669 | we could have also modified the hashing algorithm ('SHA-256' is |
670 | the default) and the format to use ('base64' is the default, but |
671 | 'hex' and 'binary' are other options). To use these, you could |
672 | change the C<encode_args> to something like: |
673 | |
674 | encode_args => {algorithm => 'SHA-1', |
675 | format => 'hex', |
676 | salt_length => 10}, |
677 | |
678 | |
679 | =head2 Load Hashed Passwords in the Database |
680 | |
681 | Next, let's create a quick script to load some hashed and salted passwords |
682 | into the C<password> column of our C<users> table. Open the file |
683 | C<set_hashed_passwords.pl> in your editor and enter the following text: |
684 | |
685 | #!/usr/bin/perl |
686 | |
687 | use strict; |
688 | use warnings; |
689 | |
690 | use MyApp::Schema; |
691 | |
692 | my $schema = MyApp::Schema->connect('dbi:SQLite:myapp.db'); |
693 | |
3b1fa91b |
694 | my @users = $schema->resultset('User')->all; |
efdaddec |
695 | |
696 | foreach my $user (@users) { |
697 | $user->password('mypass'); |
698 | $user->update; |
699 | } |
700 | |
701 | EncodedColumn lets us simple call C<$user->check_password($password)> |
702 | to see if the user has supplied the correct password, or, as we show |
703 | above, call C<$user->update($new_password)> to update the hashed |
704 | password stored for this user. |
705 | |
706 | Then run the following command: |
707 | |
2a6eb5f9 |
708 | $ DBIC_TRACE=1 perl -Ilib set_hashed_passwords.pl |
efdaddec |
709 | |
c12b0d35 |
710 | We had to use the C<-Ilib> argument to tell perl to look under the |
efdaddec |
711 | C<lib> directory for our C<MyApp::Schema> model. |
712 | |
2a6eb5f9 |
713 | The DBIC_TRACE output should show that the update worked: |
714 | |
715 | $ DBIC_TRACE=1 perl -Ilib set_hashed_passwords.pl |
cc0ef55e |
716 | SELECT me.id, me.username, me.password, me.email_address, |
717 | me.first_name, me.last_name, me.active FROM user me: |
718 | UPDATE user SET password = ? WHERE ( id = ? ): |
719 | 'oXiyAcGOjowz7ISUhpIm1IrS8AxSZ9r4jNjpX9VnVeQmN6GRtRKTz', '1' |
720 | UPDATE user SET password = ? WHERE ( id = ? ): |
721 | 'PmyEPrkB8EGwvaF/DvJm7LIfxoZARjv8ygFIR7pc1gEA1OfwHGNzs', '2' |
722 | UPDATE user SET password = ? WHERE ( id = ? ): |
723 | 'h7CS1Fm9UCs4hjcbu2im0HumaHCJUq4Uriac+SQgdUMUfFSoOrz3c', '3' |
2a6eb5f9 |
724 | |
725 | But we can further confirm our actions by dumping the users table: |
efdaddec |
726 | |
3b1fa91b |
727 | $ sqlite3 myapp.db "select * from user" |
efdaddec |
728 | 1|test01|38d3974fa9e9263099f7bc2574284b2f55473a9bM=fwpX2NR8|t01@na.com|Joe|Blow|1 |
729 | 2|test02|6ed8586587e53e0d7509b1cfed5df08feadc68cbMJlnPyPt0I|t02@na.com|Jane|Doe|1 |
730 | 3|test03|af929a151340c6aed4d54d7e2651795d1ad2e2f7UW8dHoGv9z|t03@na.com|No|Go|0 |
731 | |
732 | As you can see, the passwords are much harder to steal from the |
444d6b27 |
733 | database (not only are the hashes stored, but every hash is different |
734 | even though the passwords are the same because of the added "salt" |
735 | value). Also note that this demonstrates how to use a DBIx::Class |
efdaddec |
736 | model outside of your web application -- a very useful feature in many |
737 | situations. |
738 | |
739 | |
740 | =head2 Enable Hashed and Salted Passwords |
741 | |
cc0ef55e |
742 | Edit C<lib/MyApp.pm> and update it to match the following text (the |
743 | only change is to the C<password_type> field): |
efdaddec |
744 | |
745 | # Configure SimpleDB Authentication |
746 | __PACKAGE__->config->{'Plugin::Authentication'} = { |
747 | default => { |
748 | class => 'SimpleDB', |
3b1fa91b |
749 | user_model => 'DB::User', |
efdaddec |
750 | password_type => 'self_check', |
751 | }, |
752 | }; |
753 | |
754 | The use of C<self_check> will cause |
755 | Catalyst::Plugin::Authentication::Store::DBIC to call the |
756 | C<check_password> method we enabled on our C<password> columns. |
d442cc9f |
757 | |
1390ef0e |
758 | |
d442cc9f |
759 | =head2 Try Out the Hashed Passwords |
760 | |
3c700304 |
761 | The development server should restart as soon as your save the |
762 | C<lib/MyApp.pm> file in the previous section. You should now be able to |
763 | go to L<http://localhost:3000/books/list> and login as before. When |
764 | done, click the "logout" link on the login page (or point your browser |
765 | at L<http://localhost:3000/logout>). |
d442cc9f |
766 | |
d442cc9f |
767 | |
768 | =head1 USING THE SESSION FOR FLASH |
769 | |
4b4d3884 |
770 | As discussed in the previous chapter of the tutorial, C<flash> allows |
771 | you to set variables in a way that is very similar to C<stash>, but it |
772 | will remain set across multiple requests. Once the value is read, it |
773 | is cleared (unless reset). Although C<flash> has nothing to do with |
774 | authentication, it does leverage the same session plugins. Now that |
775 | those plugins are enabled, let's go back and update the "delete and |
776 | redirect with query parameters" code seen at the end of the L<Basic |
3ab6187c |
777 | CRUD|Catalyst::Manual::Tutorial::04_BasicCRUD> chapter of the tutorial to |
4b4d3884 |
778 | take advantage of C<flash>. |
d442cc9f |
779 | |
780 | First, open C<lib/MyApp/Controller/Books.pm> and modify C<sub delete> |
3533daff |
781 | to match the following (everything after the model search line of code |
782 | has changed): |
d442cc9f |
783 | |
905a3a26 |
784 | =head2 delete |
efdaddec |
785 | |
d442cc9f |
786 | Delete a book |
efdaddec |
787 | |
d442cc9f |
788 | =cut |
efdaddec |
789 | |
fbbb9084 |
790 | sub delete :Chained('object') :PathPart('delete') :Args(0) { |
791 | my ($self, $c) = @_; |
efdaddec |
792 | |
fbbb9084 |
793 | # Use the book object saved by 'object' and delete it along |
794 | # with related 'book_authors' entries |
795 | $c->stash->{object}->delete; |
efdaddec |
796 | |
d442cc9f |
797 | # Use 'flash' to save information across requests until it's read |
798 | $c->flash->{status_msg} = "Book deleted"; |
efdaddec |
799 | |
3533daff |
800 | # Redirect the user back to the list page |
0416017e |
801 | $c->response->redirect($c->uri_for($self->action_for('list'))); |
d442cc9f |
802 | } |
803 | |
1390ef0e |
804 | Next, open C<root/src/wrapper.tt2> and update the TT code to pull from |
d442cc9f |
805 | flash vs. the C<status_msg> query parameter: |
806 | |
1390ef0e |
807 | ... |
d442cc9f |
808 | <div id="content"> |
1390ef0e |
809 | [%# Status and error messages %] |
810 | <span class="message">[% status_msg || c.flash.status_msg %]</span> |
811 | <span class="error">[% error_msg %]</span> |
812 | [%# This is where TT will stick all of your template's contents. -%] |
813 | [% content %] |
814 | </div><!-- end content --> |
815 | ... |
905a3a26 |
816 | |
636ba9f7 |
817 | Although the sample above only shows the C<content> div, leave the |
cc0ef55e |
818 | rest of the file intact -- the only change we made to replace |
819 | "|| c.request.params.status_msg" with "c.flash.status_msg" in the |
820 | C<< <span class="message"> >> line. |
d442cc9f |
821 | |
822 | |
823 | =head2 Try Out Flash |
824 | |
3c700304 |
825 | Authenticate using the login screen and then point your browser to |
636ba9f7 |
826 | L<http://localhost:3000/books/url_create/Test/1/4> to create an extra |
827 | several books. Click the "Return to list" link and delete one of the |
828 | "Test" books you just added. The C<flash> mechanism should retain our |
3533daff |
829 | "Book deleted" status message across the redirect. |
d442cc9f |
830 | |
831 | B<NOTE:> While C<flash> will save information across multiple requests, |
832 | I<it does get cleared the first time it is read>. In general, this is |
833 | exactly what you want -- the C<flash> message will get displayed on |
834 | the next screen where it's appropriate, but it won't "keep showing up" |
835 | after that first time (unless you reset it). Please refer to |
836 | L<Catalyst::Plugin::Session|Catalyst::Plugin::Session> for additional |
837 | information. |
838 | |
1390ef0e |
839 | |
3533daff |
840 | =head2 Switch To Flash-To-Stash |
841 | |
636ba9f7 |
842 | Although the a use of flash above works well, the |
1390ef0e |
843 | C<status_msg || c.flash.status_msg> statement is a little ugly. A nice |
905a3a26 |
844 | alternative is to use the C<flash_to_stash> feature that automatically |
1390ef0e |
845 | copies the content of flash to stash. This makes your controller |
905a3a26 |
846 | and template code work regardless of where it was directly access, a |
fbbb9084 |
847 | forward, or a redirect. To enable C<flash_to_stash>, you can either |
905a3a26 |
848 | set the value in C<lib/MyApp.pm> by changing the default |
3533daff |
849 | C<__PACKAGE__-E<gt>config> setting to something like: |
850 | |
851 | __PACKAGE__->config( |
efdaddec |
852 | name => 'MyApp', |
3c700304 |
853 | # Disable deprecated behavior needed by old applications |
854 | disable_component_resolution_regex_fallback => 1, |
da59dbea |
855 | session => { flash_to_stash => 1 }, |
3533daff |
856 | ); |
857 | |
45d511e0 |
858 | B<or> add the following to C<myapp.conf>: |
3533daff |
859 | |
45d511e0 |
860 | <session> |
861 | flash_to_stash 1 |
862 | </session> |
3533daff |
863 | |
905a3a26 |
864 | The C<__PACKAGE__-E<gt>config> option is probably preferable here |
865 | since it's not something you will want to change at runtime without it |
3533daff |
866 | possibly breaking some of your code. |
867 | |
1390ef0e |
868 | Then edit C<root/src/wrapper.tt2> and change the C<status_msg> line |
869 | to match the following: |
3533daff |
870 | |
871 | <span class="message">[% status_msg %]</span> |
872 | |
3c700304 |
873 | Now go to L<http://localhost:3000/books/list> in your browser. Delete |
874 | another of the "Test" books you added in the previous step. Flash should |
875 | still maintain the status message across the redirect even though you |
876 | are no longer explicitly accessing C<c.flash>. |
3533daff |
877 | |
d442cc9f |
878 | |
879 | =head1 AUTHOR |
880 | |
881 | Kennedy Clark, C<hkclark@gmail.com> |
882 | |
883 | Please report any errors, issues or suggestions to the author. The |
884 | most recent version of the Catalyst Tutorial can be found at |
59884771 |
885 | L<http://dev.catalyst.perl.org/repos/Catalyst/Catalyst-Manual/5.80/trunk/lib/Catalyst/Manual/Tutorial/>. |
d442cc9f |
886 | |
45c7830f |
887 | Copyright 2006-2008, Kennedy Clark, under Creative Commons License |
95674086 |
888 | (L<http://creativecommons.org/licenses/by-sa/3.0/us/>). |