4 import Data.List (isSuffixOf)
5 import Data.Maybe (fromJust)
6 import Data.String.Utils (split)
15 import Test.HUnit (Assertion, assertEqual)
16 import Test.Framework (Test, testGroup)
17 import Test.Framework.Providers.HUnit (testCase)
18 import Text.Regex.Posix ((=~))
20 -- Distinguish between URLs (Strings) and URIs as provided by the
21 -- Network.URI module.
25 -- | Is this URI's scheme plain HTTP?
27 http uri = (uriScheme uri) == "http:"
29 -- | Is this URI's scheme (secure) HTTPS?
31 https uri = (uriScheme uri) == "https:"
33 -- | Does this URI use an HTTP-compatible port?
34 http_port :: URI -> Bool
39 (uriPort auth) `elem` ["", ":80"]
41 parse_result = uriAuthority uri
44 make_https :: URL -> URL
47 Nothing -> url -- Shrug?
50 show $ uri { uriScheme = "https:" }
52 url -- Leave non-http URLs alone.
54 parse_result = parseURIReference url
57 add_trailing_slash :: URL -> URL
58 add_trailing_slash url =
60 Nothing -> url -- Shrug?
62 let old_path = uriPath uri in
63 if (isSuffixOf "/" old_path) || (isSuffixOf "bigpage" old_path) then
64 -- It already had a trailing slash, or it's a 'bigpage' URL.
65 -- Trailing slashes after 'bigpage' don't work.
68 show $ uri { uriPath = old_path ++ "/" }
70 parse_result = parseURIReference url
73 -- | Does this URI use an HTTPS-compatible port?
74 https_port :: URI -> Bool
79 (uriPort auth) `elem` ["", ":443"]
81 parse_result = uriAuthority uri
84 -- | Does this URL have one of the LWN hostnames?
85 lwn_host :: URI -> Bool
90 (uriRegName auth) `elem` ["lwn.net", "www.lwn.net"]
92 parse_result = uriAuthority uri
95 -- | Is the protocol portion of this URI one of the ones that LWN
97 lwn_proto :: URI -> Bool
99 ((http u) && (http_port u)) || ((https u) && (https_port u))
101 -- | Is the server/port to which we're connecting an LWN server?
102 lwn_server :: URI -> Bool
104 lwn_proto u && lwn_host u
106 -- | Is this URI's path for an LWN article?
107 lwn_article_path :: URI -> Bool
108 lwn_article_path uri =
109 path =~ "^/current(/bigpage)?/?$" ||
110 path =~ "^/Articles/[0-9]+(/bigpage)?/?$"
114 -- | Is this URI's query one that the LWN uses? The only query string
115 -- that the LWN articles use is the printable page one.
116 lwn_query :: URI -> Bool
118 query `elem` ["", "?format=printable"]
122 -- | Combine all of the other URI tests to determine if this 'URL'
123 -- belongs to an LWN article.
124 is_lwn_url :: URL -> Bool
128 Just uri -> (lwn_server uri) && (lwn_article_path uri) && (lwn_query uri)
130 parse_result = parseAbsoluteURI s
134 -- Bug here, doesn't work on unicode paths!
135 filename :: URL -> Maybe String
140 let components = split "/" (uriPath uri) in
141 -- Reverse them so that the filename comes first for easier
143 let reverse_components = reverse components in
144 case reverse_components of
148 parse_result = parseURIReference url
152 make_absolute_uri :: URI -> URI
153 make_absolute_uri relative_uri =
154 relativeTo relative_uri base_uri
156 base_auth = URIAuth { uriUserInfo = "",
157 uriRegName = "lwn.net",
159 base_uri = URI { uriScheme = "https:",
160 uriAuthority = Just base_auth,
166 make_absolute_url :: URL -> Maybe URL
167 make_absolute_url relative_url =
171 Just $ show $ make_absolute_uri relative_uri
173 parse_result = parseURIReference relative_url
175 -- | Like 'make_absolute_url', except returns its input instead of
176 -- 'Nothing' if the absolution fails.
177 try_make_absolute_url :: URL -> URL
178 try_make_absolute_url url =
179 case make_absolute_url url of
181 Just abs_url -> abs_url
183 -- | A List of LWN URLs to use during testing.
185 lwn_urls = [ proto ++ www ++ "lwn.net" ++ path ++ bigpage ++ query |
186 proto <- ["http://", "https://"],
188 bigpage <- ["", "/bigpage"],
189 query <- ["", "?format=printable"],
190 path <- [ "/current",
192 "/Articles/502371" ] ]
194 test_lwn_urls_matched :: Assertion
195 test_lwn_urls_matched =
196 assertEqual "All LWN URLs matched" True (all is_lwn_url lwn_urls)
198 test_http_uris_matched :: Assertion
199 test_http_uris_matched =
200 assertEqual (url ++ " is HTTP") True (http uri)
202 url = "http://lwn.net/Articles/500844/bigpage"
203 uri = fromJust $ parseAbsoluteURI url
205 test_https_uris_matched :: Assertion
206 test_https_uris_matched =
207 assertEqual (url ++ " is HTTPS") True (https uri)
209 url = "https://lwn.net/Articles/500844/bigpage"
210 uri = fromJust $ parseAbsoluteURI url
213 test_bare_filename_parsed :: Assertion
214 test_bare_filename_parsed =
215 assertEqual "Filename is 'example.jpg'" "example.jpg" actual_result
218 actual_result = fromJust $ filename url
220 test_absolute_filename_parsed :: Assertion
221 test_absolute_filename_parsed =
222 assertEqual "Filename is 'example.jpg'" "example.jpg" actual_result
224 url = "http://lwn.net/one/two/example.jpg"
225 actual_result = fromJust $ filename url
227 test_relative_filename_parsed :: Assertion
228 test_relative_filename_parsed =
229 assertEqual "Filename is 'example.jpg'" "example.jpg" actual_result
231 url = "/one/two/example.jpg"
232 actual_result = fromJust $ filename url
235 test_empty_url_conversion :: Assertion
236 test_empty_url_conversion =
237 assertEqual "'' converted to lwn.net" expected actual
239 expected = "https://lwn.net/"
240 actual = fromJust $ make_absolute_url ""
243 test_normal_url_conversion :: Assertion
244 test_normal_url_conversion =
245 assertEqual "Image URL is made absolute" expected actual
247 url = "/images/2012/lcj-coughlan-lattimer-sm.jpg"
248 expected = "https://lwn.net/images/2012/lcj-coughlan-lattimer-sm.jpg"
249 actual = fromJust $ make_absolute_url url
253 test_make_https :: Assertion
255 assertEqual "HTTP URL is made HTTPS" expected actual
257 url = "http://lwn.net/current"
258 expected = "https://lwn.net/current"
259 actual = make_https url
262 test_add_trailing_slash :: Assertion
263 test_add_trailing_slash =
264 assertEqual "Trailing slashes get added" expected actual
266 url = "https://lwn.net/current"
267 expected = "https://lwn.net/current/"
268 actual = add_trailing_slash url
273 testGroup "URI Tests" [
275 testGroup "URI Matching" [
276 testCase "HTTP URIs matched" test_http_uris_matched,
277 testCase "HTTPS URIs matched" test_https_uris_matched,
278 testCase "LWN URLs matched" test_lwn_urls_matched ],
280 testGroup "Filename Parsing" [
281 testCase "Bare filename parsed" test_bare_filename_parsed,
282 testCase "Absolute filename parsed" test_absolute_filename_parsed,
283 testCase "Relative filename parsed" test_relative_filename_parsed ],
285 testGroup "Relative -> Absolute Conversion" [
286 testCase "Empty URL converted to lwn.net" test_empty_url_conversion,
287 testCase "Normal URL made absolute" test_normal_url_conversion ],
289 testGroup "URL Mangling" [
290 testCase "HTTP URLs are made HTTPS" test_make_https,
291 testCase "Trailing slashes get added" test_add_trailing_slash ]