MDL-49329 admin: Improve the UI for installing dependencies

admin/index.php

@@ -106,7 +106,8 @@ $agreelicense   = optional_param('agreelicense', 0, PARAM_BOOL);
 $fetchupdates   = optional_param('fetchupdates', 0, PARAM_BOOL);
 $newaddonreq    = optional_param('installaddonrequest', null, PARAM_RAW);
 $upgradekeyhash = optional_param('upgradekeyhash', null, PARAM_ALPHANUM);
-$installalldeps = optional_param('installalldeps', false, PARAM_BOOL);
+$installdep     = optional_param('installdep', null, PARAM_COMPONENT);
+$installdepx    = optional_param('installdepx', false, PARAM_BOOL);
 $abortinstall   = optional_param('abortinstall', null, PARAM_COMPONENT);
 $abortinstallx  = optional_param('abortinstallx', null, PARAM_BOOL);
 

admin/renderer.php

@@ -1138,18 +1138,30 @@ class core_admin_renderer extends plugin_renderer_base {
 
         if ($available) {
             $out .= $this->output->heading(get_string('misdepsavail', 'core_plugin'));
-            $out .= $this->available_missing_dependencies_list($pluginman, $available);
+            $installable = array();
+            foreach ($available as $component => $remoteinfo) {
+                if ($pluginman->is_remote_plugin_installable($component, $remoteinfo->version->version)) {
+                    $installable[$component] = $remoteinfo;
+                }
+            }
+
             $out .= $this->output->container_start('plugins-check-dependencies-actions');
 
-            // TODO implement the button functionality.
-            $out .= html_writer::link(
-                new moodle_url($this->page->url, array('installalldeps' => 1, 'sesskey' => sesskey())),
-                get_string('dependencyinstallmissing', 'core_plugin'),
-                array('class' => 'btn')
-            );
-            $out.= ' | '.html_writer::link(new moodle_url('/admin/tool/installaddon/'),
-                get_string('dependencyuploadmissing', 'core_plugin'));
+            if ($installable) {
+                $out .= $this->output->single_button(
+                    new moodle_url($this->page->url, array('installdepx' => 1)),
+                    get_string('dependencyinstallmissing', 'core_plugin', count($installable)),
+                    'post',
+                    array('class' => 'singlebutton dependencyinstallmissing')
+                );
+            }
+
+            $out.= html_writer::div(html_writer::link(new moodle_url('/admin/tool/installaddon/'),
+                get_string('dependencyuploadmissing', 'core_plugin')), 'dependencyuploadmissing');
+
             $out .= $this->output->container_end(); // .plugins-check-dependencies-actions
+
+            $out .= $this->available_missing_dependencies_list($pluginman, $available);
         }
 
         $out .= $this->output->container_end(); // .plugins-check-dependencies
@@ -1206,24 +1218,32 @@ class core_admin_renderer extends plugin_renderer_base {
                 $info = '';
             }
 
-            $info .= html_writer::span(
+            $info .= $this->output->container_start('actions');
+
+            $info .= html_writer::div(
                 html_writer::link('https://moodle.org/plugins/view.php?plugin='.$plugin->component,
                     get_string('misdepinfoplugin', 'core_plugin')),
                 'misdepinfoplugin'
             );
 
-            $info .= ' | '.html_writer::span(
+            $info .= html_writer::div(
                 html_writer::link('https://moodle.org/plugins/pluginversion.php?id='.$plugin->version->id,
                     get_string('misdepinfoversion', 'core_plugin')),
                 'misdepinfoversion'
             );
 
-            $info .= ' | '.html_writer::link($plugin->version->downloadurl, get_string('download'),
-                array('class' => 'btn btn-small'));
+            $info .= html_writer::div(html_writer::link($plugin->version->downloadurl, get_string('download')), 'misdepdownload');
+
+            if ($pluginman->is_remote_plugin_installable($plugin->component, $plugin->version->version)) {
+                $info .= $this->output->single_button(
+                    new moodle_url($this->page->url, array('installdep' => $plugin->component)),
+                    get_string('dependencyinstall', 'core_plugin'),
+                    'post',
+                    array('class' => 'singlebutton dependencyinstall')
+                );
+            }
 
-            // TODO Implement the button functionality.
-            $info .= ' | '.html_writer::link($plugin->version->downloadurl, get_string('dependencyinstall', 'core_plugin'),
-                array('class' => 'btn btn-small'));
+            $info .= $this->output->container_end(); // .actions
 
             $table->data[] = array(
                 html_writer::div($plugin->name, 'name').' '.html_writer::div($plugin->component, 'component'),

config-dist.php

@@ -449,11 +449,13 @@ $CFG->admin = 'admin';
 //
 // Use the following flag to completely disable the Automatic updates deployment
 // feature and hide it from the server administration UI.
+// TODO: drop this flag and use disableonclickaddoninstall instead.
 //
 //      $CFG->disableupdateautodeploy = true;
 //
-// Use the following flag to completely disable the On-click add-on installation
-// feature and hide it from the server administration UI.
+// Use the following flag to completely disable the installation of plugins
+// (new plugins, available updates and missing dependencies) via the server
+// administration UI.
 //
 //      $CFG->disableonclickaddoninstall = true;
 //

lang/en/plugin.php

@@ -35,7 +35,7 @@ $string['detectedmisplacedplugin'] = 'Plugin "{$a->component}" is installed in i
 $string['dependencyavailable'] = 'Available';
 $string['dependencyfails'] = 'Fails';
 $string['dependencyinstall'] = 'Install';
-$string['dependencyinstallmissing'] = 'Install all missing dependencies';
+$string['dependencyinstallmissing'] = 'Install missing dependencies ({$a})';
 $string['dependencymissing'] = 'Missing';
 $string['dependencyunavailable'] = 'Unavailable';
 $string['dependencyupload'] = 'Upload';

lib/classes/plugin_manager.php

@@ -915,6 +915,51 @@ class core_plugin_manager {
         return true;
     }
 
+    /**
+     * Can the given plugin remote plugin be installed via the admin UI?
+     *
+     * @param string $component
+     * @param string|int $requiredversion ANY_VERSION or the version number
+     * @return boolean
+     */
+    public function is_remote_plugin_installable($component, $requiredversion) {
+        global $CFG;
+
+        // Make sure the feature is not disabled.
+        if (!empty($CFG->disableonclickaddoninstall)) {
+            return false;
+        }
+
+        // Make sure we know there is some version available.
+        if (!$this->is_remote_plugin_available($component, $requiredversion)) {
+            return false;
+        }
+
+        // Make sure the plugin type root directory is writable.
+        list($plugintype, $pluginname) = core_component::normalize_component($component);
+        if (!$this->is_plugintype_writable($plugintype)) {
+            return false;
+        }
+
+        $remoteinfo = $this->get_remote_plugin_info($component, $requiredversion);
+        $localinfo = $this->get_plugin_info($component);
+
+        if ($localinfo) {
+            // If the plugin is already present, prevent downgrade.
+            if ($current->versiondb > $remoteinfo->version->version) {
+                return false;
+            }
+
+            // Make sure we have write access to all the existing code.
+            if (!$this->is_plugin_folder_removable($component)) {
+                return false;
+            }
+        }
+
+        // Looks like it could work.
+        return true;
+    }
+
     /**
      * Returns information about a plugin in the plugins directory.
      *

theme/bootstrapbase/less/moodle/admin.less

@@ -656,12 +656,40 @@ img.iconsmall {
         }
     }
 
-    // Available dependencies on the plugins check page.
+    .plugins-check-dependencies-actions {
+        > div {
+            display: inline-block;
+            margin-right: 1em;
+        }
+        .singlebutton {
+            margin: 5px 0;
+            padding: 0;
+            input {
+                margin: 0;
+            }
+        }
+    }
+
+    // List of available dependencies on the plugins check page.
     #plugins-check-available-dependencies {
         .displayname .component {
             font-size: @fontSizeSmall;
             .muted
         }
+        .info .actions {
+            > div {
+                display: inline-block;
+                margin-right: 1em;
+            }
+            .singlebutton {
+                display: block;
+                margin: 5px 0;
+                padding: 0;
+                input {
+                    margin: 0;
+                }
+            }
+        }
     }
 }