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<title>[BuddyPress][11806] trunk: Activity: add function to check if a user has access to a single activity.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="http://buddypress.trac.wordpress.org/changeset/11806">11806</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"http://buddypress.trac.wordpress.org/changeset/11806","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>djpaul</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2018-01-10 18:59:00 +0000 (Wed, 10 Jan 2018)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Activity: add function to check if a user has access to a single activity.

This change extracts the existing logic from `bp_activity_screen_single_activity_permalink()` into a new function, allowing it to be used in multiple places, such as the REST API, or a WP-CLI extension.

Fixes <a href="http://buddypress.trac.wordpress.org/ticket/7048">#7048</a>

Props espellcaste</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcbpactivitybpactivityfunctionsphp">trunk/src/bp-activity/bp-activity-functions.php</a></li>
<li><a href="#trunksrcbpactivitybpactivityscreensphp">trunk/src/bp-activity/bp-activity-screens.php</a></li>
<li><a href="#trunktestsphpunittestcasesactivityfunctionsphp">trunk/tests/phpunit/testcases/activity/functions.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcbpactivitybpactivityfunctionsphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/bp-activity/bp-activity-functions.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/bp-activity/bp-activity-functions.php   2018-01-10 12:49:30 UTC (rev 11805)
+++ trunk/src/bp-activity/bp-activity-functions.php     2018-01-10 18:59:00 UTC (rev 11806)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -3081,6 +3081,55 @@
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * Can a user see a particular activity item?
+ *
+ * @since 3.0.0
+ *
+ * @param  BP_Activity_Activity $activity Activity object.
+ * @param  integer              $user_id  User ID.
+ * @return boolean True on success, false on failure.
+ */
+function bp_activity_user_can_read( $activity, $user_id = 0 ) {
+       $retval = false;
+
+       // Fallback.
+       if ( empty( $user_id ) ) {
+               $user_id = bp_loggedin_user_id();
+       }
+
+       // Admins and moderators can see everything.
+       if ( bp_current_user_can( 'bp_moderate' ) ) {
+               $retval = true;
+       }
+
+       // If activity author match user, allow access as well.
+       if ( $user_id === $activity->user_id ) {
+               $retval = true;
+       }
+
+       // If activity is from a group, do an extra cap check.
+       if ( ! $retval && bp_is_active( 'groups' ) && $activity->component === buddypress()->groups->id ) {
+
+               // Check to see if the user has access to the activity's parent group.
+               $group = groups_get_group( $activity->item_id );
+               if ( $group ) {
+                       $retval = $group->user_has_access;
+               }
+       }
+
+       /**
+        * Filters whether the current user has access to an activity item.
+        *
+        * @since 3.0.0
+        *
+        * @param bool                 $retval   Return value.
+        * @param int                  $user_id  Current user ID.
+        * @param BP_Activity_Activity $activity Activity object.
+        */
+       return apply_filters( 'bp_activity_user_can_read', $retval, $user_id, $activity );
+}
+
+/**
</ins><span class="cx" style="display: block; padding: 0 10px">  * Hide a user's activity.
</span><span class="cx" style="display: block; padding: 0 10px">  *
</span><span class="cx" style="display: block; padding: 0 10px">  * @since 1.2.0
</span></span></pre></div>
<a id="trunksrcbpactivitybpactivityscreensphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/bp-activity/bp-activity-screens.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/bp-activity/bp-activity-screens.php     2018-01-10 12:49:30 UTC (rev 11805)
+++ trunk/src/bp-activity/bp-activity-screens.php       2018-01-10 18:59:00 UTC (rev 11806)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -195,19 +195,25 @@
</span><span class="cx" style="display: block; padding: 0 10px">  *
</span><span class="cx" style="display: block; padding: 0 10px">  * @since 1.2.0
</span><span class="cx" style="display: block; padding: 0 10px">  *
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * @return bool|string Boolean on false or the template for a single activity item on success.
</ins><span class="cx" style="display: block; padding: 0 10px">  */
</span><span class="cx" style="display: block; padding: 0 10px"> function bp_activity_screen_single_activity_permalink() {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        $bp = buddypress();
-
</del><span class="cx" style="display: block; padding: 0 10px">         // No displayed user or not viewing activity component.
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        if ( !bp_is_activity_component() )
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ if ( ! bp_is_activity_component() ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                 return false;
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+        }
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        if ( ! bp_current_action() || !is_numeric( bp_current_action() ) )
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $action = bp_current_action();
+       if ( ! $action || ! is_numeric( $action ) ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                 return false;
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+        }
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        // Get the activity details.
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        $activity = bp_activity_get_specific( array( 'activity_ids' => bp_current_action(), 'show_hidden' => true, 'spam' => 'ham_only', ) );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $activity = bp_activity_get_specific( array(
+               'activity_ids' => $action,
+               'show_hidden'  => true,
+               'spam'         => 'ham_only',
+       ) );
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        // 404 if activity does not exist
</span><span class="cx" style="display: block; padding: 0 10px">        if ( empty( $activity['activities'][0] ) || bp_action_variables() ) {
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -218,39 +224,22 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $activity = $activity['activities'][0];
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        // Default access is true.
-       $has_access = true;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $user_id = bp_displayed_user_id();
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        // If activity is from a group, do an extra cap check.
-       if ( isset( $bp->groups->id ) && $activity->component == $bp->groups->id ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ /**
+        * Check user access to the activity item.
+        *
+        * @since 3.0.0
+        */
+       $has_access = bp_activity_user_can_read( $activity, $user_id );
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                // Activity is from a group, but groups is currently disabled.
-               if ( !bp_is_active( 'groups') ) {
-                       bp_do_404();
-                       return;
-               }
-
-               // Check to see if the user has access to to the activity's parent group.
-               if ( $group = groups_get_group( $activity->item_id ) ) {
-                       $has_access = $group->user_has_access;
-               }
-       }
-
</del><span class="cx" style="display: block; padding: 0 10px">         // If activity author does not match displayed user, block access.
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        if ( true === $has_access && bp_displayed_user_id() !== $activity->user_id ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // More info:https://buddypress.trac.wordpress.org/ticket/7048#comment:28
+       if ( true === $has_access && $user_id !== $activity->user_id ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                 $has_access = false;
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        /**
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-         * Filters the access permission for a single activity view.
-        *
-        * @since 1.2.0
-        *
-        * @param array $access Array holding the current $has_access value and current activity item instance.
-        */
-       $has_access = apply_filters_ref_array( 'bp_activity_permalink_access', array( $has_access, &$activity ) );
-
-       /**
</del><span class="cx" style="display: block; padding: 0 10px">          * Fires before the loading of a single activity template file.
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><span class="cx" style="display: block; padding: 0 10px">         * @since 1.2.0
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -273,7 +262,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                } else {
</span><span class="cx" style="display: block; padding: 0 10px">                        $url = sprintf(
</span><span class="cx" style="display: block; padding: 0 10px">                                wp_login_url( 'wp-login.php?redirect_to=%s' ),
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                esc_url_raw( bp_activity_get_permalink( bp_current_action() ) )
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         esc_url_raw( bp_activity_get_permalink( $action ) )
</ins><span class="cx" style="display: block; padding: 0 10px">                         );
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -287,7 +276,10 @@
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><span class="cx" style="display: block; padding: 0 10px">         * @param string $template Path to the activity template to load.
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        bp_core_load_template( apply_filters( 'bp_activity_template_profile_activity_permalink', 'members/single/activity/permalink' ) );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $template = apply_filters( 'bp_activity_template_profile_activity_permalink', 'members/single/activity/permalink' );
+
+       // Load the template.
+       bp_core_load_template( $template );
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> add_action( 'bp_screens', 'bp_activity_screen_single_activity_permalink' );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span></span></pre></div>
<a id="trunktestsphpunittestcasesactivityfunctionsphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/testcases/activity/functions.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/testcases/activity/functions.php      2018-01-10 12:49:30 UTC (rev 11805)
+++ trunk/tests/phpunit/testcases/activity/functions.php        2018-01-10 18:59:00 UTC (rev 11806)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1475,6 +1475,133 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertSame( array(), $found['activities'] );
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+        /**
+        * @group bp_activity_user_can_read
+        */
+       public function test_user_can_access_their_own_activity() {
+               $u = self::factory()->user->create();
+
+               $a = self::factory()->activity->create( array(
+                       'user_id' => $u,
+               ) );
+
+               $o = self::factory()->activity->get_object_by_id( $a );
+
+               $this->assertTrue( bp_activity_user_can_read( $o, $u ) );
+       }
+
+       /**
+        * @group bp_activity_user_can_read
+        */
+       public function test_user_cannot_access_someone_elses_activity() {
+               $u = self::factory()->user->create();
+               $u2 = self::factory()->user->create();
+
+               $a = self::factory()->activity->create( array(
+                       'user_id' => $u2,
+               ) );
+
+               $o = self::factory()->activity->get_object_by_id( $a );
+
+               $this->assertFalse( bp_activity_user_can_read( $o, $u ) );
+               $this->assertTrue( bp_activity_user_can_read( $o, $u2 ) );
+       }
+
+       /**
+        * @group bp_activity_user_can_read
+        */
+       public function test_admin_can_access_someone_elses_activity() {
+               $u = self::factory()->user->create();
+               $u2 = self::factory()->user->create( array( 'role' => 'administrator' ) );
+
+               $a = self::factory()->activity->create( array(
+                       'user_id' => $u,
+               ) );
+
+               $o = self::factory()->activity->get_object_by_id( $a );
+
+               $this->assertTrue( bp_activity_user_can_read( $o, $u ) );
+
+               $this->set_current_user( $u2 );
+               $this->assertTrue( bp_activity_user_can_read( $o, $u2 ) );
+       }
+
+       /**
+        * @group bp_activity_user_can_read
+        */
+       public function test_group_admin_access_someone_elses_activity_in_a_grou() {
+               $u  = self::factory()->user->create();
+               $u2 = self::factory()->user->create();
+
+               $g  = self::factory()->group->create();
+
+               $a = self::factory()->activity->create( array(
+                       'component' => buddypress()->groups->id,
+                       'user_id'   => $u,
+                       'item_id'   => $g,
+               ) );
+
+               $o = self::factory()->activity->get_object_by_id( $a );
+
+               $this->assertTrue( bp_activity_user_can_read( $o, $u ) );
+
+               self::add_user_to_group( $u2, $g );
+
+               $m1 = new BP_Groups_Member( $u2, $g );
+               $m1->promote( 'admin' );
+
+               $this->assertTrue( bp_activity_user_can_read( $o, $u2 ) );
+       }
+
+       /**
+        * @group bp_activity_user_can_read
+        */
+       public function test_non_member_can_access_to_someone_elses_activity_in_a_group() {
+               $u  = self::factory()->user->create();
+               $u2 = self::factory()->user->create();
+
+               $g  = self::factory()->group->create();
+
+               self::add_user_to_group( $u, $g );
+
+               $a = self::factory()->activity->create( array(
+                       'component' => buddypress()->groups->id,
+                       'user_id'   => $u,
+                       'item_id'   => $g,
+               ) );
+
+               $o = self::factory()->activity->get_object_by_id( $a );
+
+               $this->assertTrue( bp_activity_user_can_read( $o, $u ) );
+               $this->assertTrue( bp_activity_user_can_read( $o, $u2 ) );
+       }
+
+       /**
+        * @group bp_activity_user_can_read
+        */
+       public function test_user_access_to_his_activity_in_disabled_group() {
+               $u  = self::factory()->user->create();
+               $g  = self::factory()->group->create();
+
+               self::add_user_to_group( $u, $g );
+
+               $a = self::factory()->activity->create( array(
+                       'component' => buddypress()->groups->id,
+                       'user_id'   => $u,
+                       'item_id'   => $g,
+               ) );
+
+               $o = self::factory()->activity->get_object_by_id( $a );
+
+               groups_edit_group_settings( $g, 0, 'hidden' );
+
+               $this->assertTrue( bp_activity_user_can_read( $o, $u ) );
+
+               groups_edit_group_settings( $g, 0, 'private' );
+
+               $this->assertTrue( bp_activity_user_can_read( $o, $u ) );
+       }
+
</ins><span class="cx" style="display: block; padding: 0 10px">         public function check_activity_caches() {
</span><span class="cx" style="display: block; padding: 0 10px">                foreach ( $this->acaches as $k => $v ) {
</span><span class="cx" style="display: block; padding: 0 10px">                        $this->acaches[ $k ] = wp_cache_get( $k, 'bp_activity' );
</span></span></pre>
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