Unlink BP Docs from Groups

bp_docs_unlink.1.patch

diff --git bp-docs.php bp-docs.php
index ac74242..e21e733 100644
--- bp-docs.php
+++ bp-docs.php
@@ -215,6 +215,10 @@ class BP_Docs {
 		// The slug used when deleting a doc
 		if ( !defined( 'BP_DOCS_UNTRASH_SLUG' ) )
 			define( 'BP_DOCS_UNTRASH_SLUG', 'untrash' );
+		
+		// The slug used when removing a doc from a group
+		if ( ! defined( 'BP_DOCS_UNLINK_FROM_GROUP_SLUG' ) )
+			define( 'BP_DOCS_UNLINK_FROM_GROUP_SLUG', 'unlink-from-group' );
 
 		// The slug used for the Started section of My Docs
 		if ( !defined( 'BP_DOCS_STARTED_SLUG' ) )
@@ -368,6 +372,8 @@ class BP_Docs {
 		add_rewrite_tag( '%%' . BP_DOCS_UNTRASH_SLUG    . '%%', '([1]{1,})' );
 		add_rewrite_tag( '%%' . BP_DOCS_CREATE_SLUG    . '%%', '([1]{1,})' );
 		add_rewrite_tag( '%%' . BP_DOCS_MY_GROUPS_SLUG . '%%', '([1]{1,})' );
+		add_rewrite_tag( '%%' . BP_DOCS_UNLINK_FROM_GROUP_SLUG . '%%', '([1]{1,})' );
+
 	}
 
 	/**
@@ -409,6 +415,10 @@ class BP_Docs {
 			bp_docs_get_docs_slug() . '/([^/]+)/' . BP_DOCS_UNTRASH_SLUG . '/?$' =>
 				'index.php?post_type=' . $this->post_type_name . '&name=' . $wp_rewrite->preg_index( 1 ) . '&' . BP_DOCS_UNTRASH_SLUG . '=1',
 
+			// Unlink from group
+			bp_docs_get_docs_slug() . '/([^/]+)/' . BP_DOCS_UNLINK_FROM_GROUP_SLUG . '/?$' =>
+				'index.php?post_type=' . $this->post_type_name . '&name=' . $wp_rewrite->preg_index( 1 ) . '&' . BP_DOCS_UNLINK_FROM_GROUP_SLUG . '=1',
+
 		);
 
 		// Merge Docs rules with existing
diff --git includes/component.php includes/component.php
index 6c652e6..bd95ad4 100644
--- includes/component.php
+++ includes/component.php
@@ -527,6 +527,25 @@ class BP_Docs_Component extends BP_Component {
 			bp_core_redirect( bp_docs_get_doc_link( $untrash_doc_id ) );
 			die();
 		}
+
+		if ( bp_docs_is_doc_read() && ! empty( $_GET[ BP_DOCS_UNLINK_FROM_GROUP_SLUG ] ) && ! empty( $_GET['doc_id'] ) && ! empty( $_GET['group_id'] ) ) {
+			check_admin_referer( 'bp_docs_unlink_from_group' );
+
+			$unlink_doc_id = absint( $_GET['doc_id'] );
+			$unlink_group_id = absint( $_GET['group_id'] );
+
+			if ( current_user_can( 'bp_docs_dissociate_from_group', $unlink_group_id ) ) {
+				if ( bp_docs_unlink_from_group( $unlink_doc_id, $unlink_group_id ) ) {
+					bp_core_add_message( __( 'Doc successfully removed from the group', 'bp-docs' ) );
+				} else {
+					bp_core_add_message( __( 'Could not remove Doc from the group.', 'bp-docs' ) );
+				}
+			} else {
+				bp_core_add_message( __( 'You do not have permission to remove that Doc from this group.', 'bp-docs' ), 'error' );
+			}
+			bp_core_redirect( bp_get_group_permalink( groups_get_group( array( 'group_id' => $unlink_group_id ) ) ) . $bp->bp_docs->slug . '/' );
+			die();
+		}
 	}
 
 	/**
diff --git includes/functions.php includes/functions.php
index 07b2c7d..2f35e88 100644
--- includes/functions.php
+++ includes/functions.php
@@ -589,6 +589,34 @@ function bp_docs_save_doc_access_settings( $doc_id ) {
 }
 
 /**
+ * Reset doc access settings to "creator"
+ *
+ * @since 1.9.0
+ * @param int $doc_id The numeric ID of the doc
+ * @return void
+ */
+function bp_docs_set_doc_access_settings_creator( $doc_id ) {
+	if ( empty( $doc_id ) ) {
+		return;
+	}
+
+	// When the doc was made private by group association, but loses that group association, we need to make sure that it doesn't become public.
+	$new_settings = array( 
+		'read' => 'creator',
+		'edit' => 'creator',
+		'read_comments' => 'creator',
+		'post_comments' => 'creator',
+		'view_history' => 'creator'
+	 );
+
+	update_post_meta( $doc_id, 'bp_docs_settings', $new_settings );
+
+	// The 'read' setting must also be saved to a taxonomy, for
+	// easier directory queries
+	bp_docs_update_doc_access( $doc_id, 'creator' );
+}
+
+/**
  * Verifies the settings associated with a given Doc
  *
  * @since 1.2
diff --git includes/integration-groups.php includes/integration-groups.php
index 04c57ce..f79e8ee 100644
--- includes/integration-groups.php
+++ includes/integration-groups.php
@@ -67,6 +67,9 @@ class BP_Docs_Groups_Integration {
 		add_filter( 'bp_docs_loop_additional_th',       array( $this, 'groups_th' ), 5 );
 		add_filter( 'bp_docs_loop_additional_td',       array( $this, 'groups_td' ), 5 );
 
+		// On group Doc directories, add the "Unlink from Group" action link
+		add_filter( 'bp_docs_doc_action_links', 		array( $this, 'add_doc_action_unlink_from_group_link' ), 10, 2 );
+
 		// Update group last active metadata when a doc is created, updated, or saved
 		add_filter( 'bp_docs_after_save',               array( $this, 'update_group_last_active' )  );
 		add_filter( 'bp_docs_before_doc_delete',        array( $this, 'update_group_last_active' ) );
@@ -775,6 +778,26 @@ class BP_Docs_Groups_Integration {
 	}
 
 	/**
+	 * On group Doc directories, add the "Unlink from Group" action link
+	 *
+	 * @package BuddyPress_Docs
+	 * @subpackage Groups
+	 * @since 1.9.0
+	 */
+	function add_doc_action_unlink_from_group_link( $links, $doc_id ) {
+		// Only add this link to the in-group doc directory
+		if ( ! $group_id = bp_get_current_group_id() ) {
+			return;
+		}
+
+		if ( current_user_can( 'bp_docs_dissociate_from_group', $group_id ) ) {
+			$links[] = '<a href="' . bp_docs_get_unlink_from_group_link( $doc_id, $group_id ) . '" class="unlink-from-group confirm">' . __( 'Unlink from Group', 'bp-docs' ) . '</a>';
+		}
+
+		return $links;
+	}
+
+	/**
 	 * Update the current group's last_activity metadata
 	 *
 	 * @package BuddyPress Docs
@@ -1488,6 +1511,66 @@ function bp_docs_set_associated_group_id( $doc_id, $group_id = 0 ) {
 
 	wp_set_post_terms( $doc_id, $term, bp_docs_get_associated_item_tax_name(), false );
 }
+/**
+ * Process group-doc unlinking requests.
+ * Allows group mods & admins to remove docs from groups they moderate.
+ *
+ * @package BuddyPress Docs
+ * @since 1.9.0
+ *
+ * @param int $doc_id ID of the doc to remove from the group
+ * @param int $group_id ID of the group the doc should be removed from
+ * @return bool true if the term is removed 
+ */
+function bp_docs_unlink_from_group( $doc_id, $group_id = 0 ) {
+	if ( $group_id ) {
+		$term = bp_docs_get_group_term( $group_id );
+	}
+
+	if ( empty( $doc_id ) || empty( $term ) ) {
+		return false;
+	}
+
+	$removed = wp_remove_object_terms( $doc_id, $term, bp_docs_get_associated_item_tax_name() );
+	// wp_remove_object_terms returns true on success, false or WP_Error on failure. 
+	$retval = ( $removed == true ) ? true : false;
+	
+	// If the doc is no longer associated with any group, make sure it doesn't become public.
+	if ( empty( bp_docs_get_associated_group_id( $doc_id ) ) ) {
+		bp_docs_set_doc_access_settings_creator( $doc_id );
+	}
+
+	return $retval;
+}
+
+/**
+ * Echo the URL for removing a Doc from a group.
+ *
+ * @since 1.9.0
+ */
+function bp_docs_unlink_from_group_link( $doc_id = false ) {
+	echo bp_docs_get_unlink_from_group_link( $doc_id, $group_id );
+}
+	/**
+	 * Get the URL for removing a Doc from a group.
+	 *
+	 * @since 1.9.0
+	 *
+	 * @param 	int 	$doc_id ID of the Doc.
+	 * @param 	int 	$group_id ID of the group to unlink from.
+	 * @return 	string 	URL for Doc unlinking.
+	 */
+	function bp_docs_get_unlink_from_group_link( $doc_id = 0, $group_id = 0 ) {
+		$doc_permalink = bp_docs_get_doc_link( $doc_id );
+
+		$unlink_link = wp_nonce_url( add_query_arg( array(
+			BP_DOCS_UNLINK_FROM_GROUP_SLUG => '1',
+			'doc_id' => intval( $doc_id ),
+			'group_id' => intval( $group_id ),
+		), $doc_permalink ), 'bp_docs_unlink_from_group' );
+
+		return apply_filters( 'bp_docs_get_unlink_from_group_link', $unlink_link, $doc_permalink, $doc_id, $group_id );
+	}
 
 function bp_docs_get_group_term( $group_id ) {
 	$group = groups_get_group( 'group_id=' . intval( $group_id ) );
@@ -1658,6 +1741,34 @@ function bp_docs_groups_map_meta_caps( $caps, $cap, $user_id, $args ) {
 			}
 
 			break;
+
+		case 'bp_docs_dissociate_from_group' :
+			if ( isset( $args[0] ) ) {
+				$group_id = intval( $args[0] );
+			} elseif ( bp_is_group() ) {
+				$group_id = bp_get_current_group_id();
+			} else {
+				$group_id = bp_docs_get_associated_group_id( get_the_ID(), $doc );
+			}
+
+			if ( empty( $group_id ) ) {
+				break;
+			}
+
+			if ( user_can( $user_id, 'bp_moderate' ) ) {
+				return array( 'exist' );
+			}
+
+			$caps = array();
+
+			// Group admins or mods should able to remove docs from groups
+			if ( groups_is_user_mod( $user_id, $group_id ) || groups_is_user_admin( $user_id, $group_id ) ) {
+				$caps[] = 'exist';
+			} else {
+				$caps[] = 'do_not_allow';
+			}
+
+			break;
 	}
 
 	return $caps;
diff --git includes/templatetags.php includes/templatetags.php
index 387d270..0936e05 100644
--- includes/templatetags.php
+++ includes/templatetags.php
@@ -959,6 +959,8 @@ function bp_docs_doc_action_links() {
 		$links[] = '<a href="' . bp_docs_get_remove_from_trash_link( get_the_ID() ) . '" class="delete confirm">' . __( 'Untrash', 'bp-docs' ) . '</a>';
 	}
 
+	$links = apply_filters( 'bp_docs_doc_action_links', $links, get_the_ID() );
+
 	echo implode( ' &#124; ', $links );
 }
 
diff --git tests/test-bp-docs.php tests/test-bp-docs.php
index 392263d..65ae0e2 100644
--- tests/test-bp-docs.php
+++ tests/test-bp-docs.php
@@ -269,6 +269,21 @@ class BP_Docs_Tests extends BP_Docs_TestCase {
 
 		$this->assertEquals( 1, $comment->comment_approved );
 	}
+	/**
+	 * @group bp_docs_unlink_from_group
+	 */
+	function test_bp_docs_unlink_from_group() {
+		$group = $this->factory->group->create();
+		$doc_id = $this->factory->doc->create( array(
+			'group' => $group,
+		) );
+
+		bp_docs_unlink_from_group( $doc_id, $group );
+
+		$maybe_group_id = bp_docs_get_associated_group_id( $doc_id );
+
+		$this->assertFalse( (bool) $maybe_group_id );
+	}
 }