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+;;; url-auth-tests.el --- Test suite for url-auth.
+
+;; Copyright (C) 2015 Free Software Foundation, Inc.
+
+;; Author: Jarno Malmari <jarno@malmari.fi>
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Test HTTP authentication methods.
+
+;;; Code:
+
+(require 'ert)
+(require 'url-auth)
+
+(defvar url-auth-test-challenges nil
+  "List of challenges for testing.
+Each challenge is a plist.  Values are as presented by the
+server's WWW-Authenticate header field.")
+
+;; Set explicitly for easier modification for re-runs.
+(setq url-auth-test-challenges
+      (list
+       (list :qop "auth"
+             :nonce "uBr3+qkQBybTr/dKWkmpUqVO7SaEwWYzyTKO7g==$"
+             :uri "/random/path"
+             :method "GET"
+             :realm "Some test realm"
+             :cnonce "YWU4NDcxYWMxMDAxMjlkMjAwMDE4MjI5MDAwMGY4NGQ="
+             :nc "00000001"
+             :username "jytky"
+             :password "xi5Ac2HEfKt1lKKO05DCSqsK0u7hqqtsT"
+             :expected-ha1 "af521db3a83abd91262fead04fa31892"
+             :expected-ha2 "e490a6a147c79404b365d1f6059ddda5"
+             :expected-response "ecb6396e93b9e09e31f19264cfd8f854")
+       (list :nonce "a1be8a3065e00c5bf190ad499299aea5"
+             :opaque "d7c2a27230fc8c74bb6e06be8c9cd189"
+             :realm "The Test Realm"
+             :username "user"
+             :password "passwd"
+             :uri "/digest-auth/auth/user/passwd"
+             :method "GET"
+             :expected-ha1 "19c41161a8720edaeb7922ef8531137d"
+             :expected-ha2 "b44272ea65ee4af7fb26c5dba58f6863"
+             :expected-response "46c47a6d8e1fa95a3efcf49724af3fe7")
+       (list :nonce "servernonce"
+             :username "user"
+             :password "passwd"
+             :realm "The Test Realm 1"
+             :uri "/digest-auth/auth/user/passwd"
+             :method "GET"
+             :expected-ha1 "00f848f943c9a05dd06c932a7334f120"
+             :expected-ha2 "b44272ea65ee4af7fb26c5dba58f6863"
+             :expected-response "b8a48cdc9aa9e514509a5a5c53d4e8cf")
+       (list :nonce "servernonce"
+             :username "user"
+             :password "passwd"
+             :realm "The Test Realm 2"
+             :uri "/digest-auth/auth/user/passwd"
+             :method "GET"
+             :expected-ha1 "74d6abd3651d6b8260733d8a4c37ec1a"
+             :expected-ha2 "b44272ea65ee4af7fb26c5dba58f6863"
+             :expected-response "0d84884d967e04440efc77e9e2b5b561")))
+
+(ert-deftest url-auth-test-digest-create-key ()
+  "Check user credentials in their hashed form."
+  (dolist (challenge url-auth-test-challenges)
+    (let ((key (url-digest-auth-create-key (plist-get challenge :username)
+                                           (plist-get challenge :password)
+                                           (plist-get challenge :realm)
+                                           (plist-get challenge :method)
+                                           (plist-get challenge :uri))))
+      (should (= (length key) 2))
+      (should (string= (nth 0 key) (plist-get challenge :expected-ha1)))
+      (should (string= (nth 1 key) (plist-get challenge :expected-ha2)))
+      )))
+
+(ert-deftest url-auth-test-digest-auth-retrieve-cache ()
+  "Check how the entry point retrieves cached authentication.
+Essential is how realms and paths are matched."
+
+  (let* ((url-digest-auth-storage
+          '(("example.org:80"
+             ("/path/auth1" "auth1user" "key")
+             ("/path" "pathuser" "key")
+             ("/" "rootuser" "key")
+             ("realm1" "realm1user" "key")
+             ("realm2" "realm2user" "key")
+             ("/path/auth2" "auth2user" "key"))
+            ("example.org:443"
+             ("realm" "secure_user" "key"))
+            ("rootless.org:80"          ; no "/" entry for this on purpose
+             ("/path" "pathuser" "key")
+             ("realm" "realmuser" "key"))))
+         (attrs (list (cons "nonce" "servernonce")))
+         auth)
+
+    (dolist (row (list
+                  ;; If :expected-user is `nil' it indicates
+                  ;; authentication information shouldn't be found.
+
+                  ;; non-existent server
+ (list :url "http://other.com/path" :realm nil :expected-user nil)
+
+                  ;; unmatched port
+ (list :url "http://example.org:444/path" :realm nil :expected-user
+il)
+
+                  ;; root, no realm
+                  (list :url "http://example.org/"
+                        :realm nil :expected-user "rootuser")
+
+                  ;; root, no realm, explicit port
+                  (list :url "http://example.org:80/"
+                        :realm nil :expected-user "rootuser")
+
+                  (list :url "http://example.org/unknown"
+                        :realm nil :expected-user "rootuser")
+
+                  ;; realm specified, overrides any path
+                  (list :url "http://example.org/"
+                        :realm "realm1" :expected-user "realm1user")
+
+                  ;; realm specified, overrides any path
+                  (list :url "http://example.org/"
+                        :realm "realm2" :expected-user "realm2user")
+
+                  ;; authentication determined by path
+                  (list :url "http://example.org/path/auth1/query"
+                        :realm nil :expected-user "auth1user")
+
+                  ;; /path shadows /path/auth2, hence pathuser is expected
+                  (list :url "http://example.org/path/auth2/query"
+                        :realm nil :expected-user "pathuser")
+
+                  (list :url "https://example.org/path"
+                        :realm nil :expected-user "secure_user")
+
+                  ;; not really secure user but using the same port
+                  (list :url "http://example.org:443/path"
+                        :realm nil :expected-user "secure_user")
+
+                  ;; preferring realm user over path, even though no
+                  ;; realm specified (not sure why)
+                  (list :url "http://rootless.org/"
+                        :realm nil :expected-user "realmuser")
+                  ;; second variant for the same case
+                  (list :url "http://rootless.org/unknown/path"
+                        :realm nil :expected-user "realmuser")
+
+                  ;; path match
+                  (list :url "http://rootless.org/path/query?q=a"
+                        :realm nil :expected-user "pathuser")
+
+                  ;; path match, realm match, prefer realm
+                  (list :url "http://rootless.org/path/query?q=a"
+                        :realm "realm" :expected-user "realmuser")
+                  ))
+      (setq auth (url-digest-auth (plist-get row :url)
+                                  nil nil
+                                  (plist-get row :realm) attrs))
+      (if (plist-get row :expected-user)
+          (progn (should auth)
+                 (should (string-match ".*username=\"\\(.*?\\)\".*" auth))
+                 (should (string= (match-string 1 auth)
+                                  (plist-get row :expected-user))))
+        (should-not auth)))))
+
+(ert-deftest url-auth-test-digest-auth ()
+  "Check common authorization string contents.
+Challenges with qop are not checked for response since a unique
+cnonce is used for generating them which is not mocked by the
+test and cannot be passed by arguments to `url-digest-auth'."
+  (dolist (challenge url-auth-test-challenges)
+    (let* ((attrs (append
+                   (list (cons "nonce" (plist-get challenge :nonce)))
+                   (if (plist-get challenge :qop)
+                       (list (cons "qop" (plist-get challenge :qop))))))
+           (url (concat "http://example.org" (plist-get challenge :uri)))
+           url-digest-auth-storage
+           auth)
+      ;; Add authentication info to cache so `url-digest-auth' can
+      ;; complete without prompting minibuffer input.
+      (setq url-digest-auth-storage
+            (list
+             (list "example.org:80"
+                   (cons (or (plist-get challenge :realm) "/")
+                         (cons (plist-get challenge :username)
+ (url-digest-auth-create-key (plist-get challenge :username)
+ (plist-get challenge :password)
+ (plist-get challenge :realm)
+ (plist-get challenge :method)
+ (plist-get challenge :uri)))))))
+      (setq auth (url-digest-auth (url-generic-parse-url url) nil nil
+                                  (plist-get challenge :realm) attrs))
+      (should auth)
+      (should (string-prefix-p "Digest " auth))
+      (should (string-match ".*username=\"\\(.*?\\)\".*" auth))
+      (should (string= (match-string 1 auth)
+                       (plist-get challenge :username)))
+      (should (string-match ".*realm=\"\\(.*?\\)\".*" auth))
+      (should (string= (match-string 1 auth)
+                       (plist-get challenge :realm)))
+
+      (if (plist-member challenge :qop)
+          (progn
+            ;; We don't know these, just check that they exists.
+            (should (string-match-p ".*response=\".*?\".*" auth))
+            (should (string-match-p ".*nc=\".*?\".*" auth))
+            (should (string-match-p ".*cnonce=\".*?\".*" auth)))
+        (should (string-match ".*response=\"\\(.*?\\)\".*" auth))
+        (should (string= (match-string 1 auth)
+                         (plist-get challenge :expected-response))))
+        )))
+
+(ert-deftest url-auth-test-digest-auth-opaque ()
+  "Check that `opaque' value is added to result when presented by
+the server."
+  (let* ((url-digest-auth-storage
+          '(("example.org:80" ("/" "user" "key"))))
+         (attrs (list (cons "nonce" "anynonce")))
+         auth)
+    ;; Get authentication info from cache without `opaque'.
+    (setq auth (url-digest-auth "http://example.org/path" nil nil nil attrs))
+    (should auth)
+    (should-not (string-match-p "opaque=" auth))
+
+    ;; Add `opaque' to attributes.
+    (push (cons "opaque" "opaque-value") attrs)
+    (setq auth (url-digest-auth "http://example.org/path" nil nil nil attrs))
+    (should auth)
+    (should (string-match ".*opaque=\"\\(.*?\\)\".*" auth))
+    (should (string= (match-string 1 auth) "opaque-value"))))
+
+(provide 'url-auth-tests)
+;;; url-auth-tests.el ends here