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1 <?php
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2
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3 namespace Drupal\workspaces;
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4
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5 use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
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6 use Drupal\Core\Entity\EntityFieldManagerInterface;
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7 use Drupal\Core\Entity\EntityTypeInterface;
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8 use Drupal\Core\Entity\EntityTypeManagerInterface;
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9 use Drupal\views\Plugin\views\query\QueryPluginBase;
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10 use Drupal\views\Plugin\views\query\Sql;
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11 use Drupal\views\Plugin\ViewsHandlerManager;
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12 use Drupal\views\ViewExecutable;
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13 use Drupal\views\ViewsData;
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14 use Symfony\Component\DependencyInjection\ContainerInterface;
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15
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16 /**
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17 * Defines a class for altering views queries.
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18 *
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19 * @internal
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20 */
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21 class ViewsQueryAlter implements ContainerInjectionInterface {
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22
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23 /**
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24 * The entity type manager service.
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25 *
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26 * @var \Drupal\Core\Entity\EntityTypeManagerInterface
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27 */
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28 protected $entityTypeManager;
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29
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30 /**
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31 * The entity field manager.
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32 *
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33 * @var \Drupal\Core\Entity\EntityFieldManagerInterface
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34 */
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35 protected $entityFieldManager;
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36
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37 /**
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38 * The workspace manager service.
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39 *
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40 * @var \Drupal\workspaces\WorkspaceManagerInterface
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41 */
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42 protected $workspaceManager;
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43
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44 /**
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45 * The views data.
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46 *
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47 * @var \Drupal\views\ViewsData
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48 */
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49 protected $viewsData;
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50
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51 /**
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52 * A plugin manager which handles instances of views join plugins.
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53 *
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54 * @var \Drupal\views\Plugin\ViewsHandlerManager
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55 */
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56 protected $viewsJoinPluginManager;
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57
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58 /**
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59 * Constructs a new ViewsQueryAlter instance.
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60 *
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61 * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
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62 * The entity type manager service.
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63 * @param \Drupal\Core\Entity\EntityFieldManagerInterface $entity_field_manager
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64 * The entity field manager.
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65 * @param \Drupal\workspaces\WorkspaceManagerInterface $workspace_manager
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66 * The workspace manager service.
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67 * @param \Drupal\views\ViewsData $views_data
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68 * The views data.
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69 * @param \Drupal\views\Plugin\ViewsHandlerManager $views_join_plugin_manager
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70 * The views join plugin manager.
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71 */
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72 public function __construct(EntityTypeManagerInterface $entity_type_manager, EntityFieldManagerInterface $entity_field_manager, WorkspaceManagerInterface $workspace_manager, ViewsData $views_data, ViewsHandlerManager $views_join_plugin_manager) {
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73 $this->entityTypeManager = $entity_type_manager;
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74 $this->entityFieldManager = $entity_field_manager;
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75 $this->workspaceManager = $workspace_manager;
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76 $this->viewsData = $views_data;
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77 $this->viewsJoinPluginManager = $views_join_plugin_manager;
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78 }
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79
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80 /**
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81 * {@inheritdoc}
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82 */
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83 public static function create(ContainerInterface $container) {
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84 return new static(
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85 $container->get('entity_type.manager'),
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86 $container->get('entity_field.manager'),
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87 $container->get('workspaces.manager'),
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88 $container->get('views.views_data'),
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89 $container->get('plugin.manager.views.join')
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90 );
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91 }
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92
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93 /**
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94 * Implements a hook bridge for hook_views_query_alter().
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95 *
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96 * @see hook_views_query_alter()
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97 */
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98 public function alterQuery(ViewExecutable $view, QueryPluginBase $query) {
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99 // Don't alter any views queries if we're in the default workspace.
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100 if ($this->workspaceManager->getActiveWorkspace()->isDefaultWorkspace()) {
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101 return;
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102 }
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103
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104 // Don't alter any non-sql views queries.
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105 if (!$query instanceof Sql) {
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106 return;
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107 }
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108
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109 // Find out what entity types are represented in this query.
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110 $entity_type_ids = [];
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111 foreach ($query->relationships as $info) {
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112 $table_data = $this->viewsData->get($info['base']);
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113 if (empty($table_data['table']['entity type'])) {
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114 continue;
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115 }
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116 $entity_type_id = $table_data['table']['entity type'];
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117 // This construct ensures each entity type exists only once.
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118 $entity_type_ids[$entity_type_id] = $entity_type_id;
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119 }
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120
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121 $entity_type_definitions = $this->entityTypeManager->getDefinitions();
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122 foreach ($entity_type_ids as $entity_type_id) {
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123 if ($this->workspaceManager->isEntityTypeSupported($entity_type_definitions[$entity_type_id])) {
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124 $this->alterQueryForEntityType($query, $entity_type_definitions[$entity_type_id]);
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125 }
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126 }
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127 }
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128
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129 /**
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130 * Alters the entity type tables for a Views query.
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131 *
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132 * This should only be called after determining that this entity type is
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133 * involved in the query, and that a non-default workspace is in use.
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134 *
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135 * @param \Drupal\views\Plugin\views\query\Sql $query
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136 * The query plugin object for the query.
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137 * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
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138 * The entity type definition.
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139 */
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140 protected function alterQueryForEntityType(Sql $query, EntityTypeInterface $entity_type) {
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141 /** @var \Drupal\Core\Entity\Sql\DefaultTableMapping $table_mapping */
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142 $table_mapping = $this->entityTypeManager->getStorage($entity_type->id())->getTableMapping();
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143 $field_storage_definitions = $this->entityFieldManager->getFieldStorageDefinitions($entity_type->id());
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144 $dedicated_field_storage_definitions = array_filter($field_storage_definitions, function ($definition) use ($table_mapping) {
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145 return $table_mapping->requiresDedicatedTableStorage($definition);
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146 });
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147 $dedicated_field_data_tables = array_map(function ($definition) use ($table_mapping) {
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148 return $table_mapping->getDedicatedDataTableName($definition);
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149 }, $dedicated_field_storage_definitions);
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150
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151 $move_workspace_tables = [];
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152 $table_queue =& $query->getTableQueue();
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153 foreach ($table_queue as $alias => &$table_info) {
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154 // If we reach the workspace_association array item before any candidates,
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155 // then we do not need to move it.
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156 if ($table_info['table'] == 'workspace_association') {
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157 break;
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158 }
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159
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160 // Any dedicated field table is a candidate.
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161 if ($field_name = array_search($table_info['table'], $dedicated_field_data_tables, TRUE)) {
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162 $relationship = $table_info['relationship'];
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163
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164 // There can be reverse relationships used. If so, Workspaces can't do
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165 // anything with them. Detect this and skip.
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166 if ($table_info['join']->field != 'entity_id') {
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167 continue;
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168 }
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169
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170 // Get the dedicated revision table name.
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171 $new_table_name = $table_mapping->getDedicatedRevisionTableName($field_storage_definitions[$field_name]);
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172
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173 // Now add the workspace_association table.
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174 $workspace_association_table = $this->ensureWorkspaceAssociationTable($entity_type->id(), $query, $relationship);
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175
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176 // Update the join to use our COALESCE.
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177 $revision_field = $entity_type->getKey('revision');
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178 $table_info['join']->leftTable = NULL;
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179 $table_info['join']->leftField = "COALESCE($workspace_association_table.target_entity_revision_id, $relationship.$revision_field)";
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180
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181 // Update the join and the table info to our new table name, and to join
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182 // on the revision key.
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183 $table_info['table'] = $new_table_name;
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184 $table_info['join']->table = $new_table_name;
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185 $table_info['join']->field = 'revision_id';
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186
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187 // Finally, if we added the workspace_association table we have to move
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188 // it in the table queue so that it comes before this field.
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189 if (empty($move_workspace_tables[$workspace_association_table])) {
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190 $move_workspace_tables[$workspace_association_table] = $alias;
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191 }
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192 }
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193 }
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194
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195 // JOINs must be in order. i.e, any tables you mention in the ON clause of a
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196 // JOIN must appear prior to that JOIN. Since we're modifying a JOIN in
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197 // place, and adding a new table, we must ensure that the new table appears
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198 // prior to this one. So we recorded at what index we saw that table, and
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199 // then use array_splice() to move the workspace_association table join to
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200 // the correct position.
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201 foreach ($move_workspace_tables as $workspace_association_table => $alias) {
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202 $this->moveEntityTable($query, $workspace_association_table, $alias);
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203 }
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204
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205 $base_entity_table = $entity_type->isTranslatable() ? $entity_type->getDataTable() : $entity_type->getBaseTable();
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206
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207 $base_fields = array_diff($table_mapping->getFieldNames($entity_type->getBaseTable()), [$entity_type->getKey('langcode')]);
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208 $revisionable_fields = array_diff($table_mapping->getFieldNames($entity_type->getRevisionDataTable()), $base_fields);
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209
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210 // Go through and look to see if we have to modify fields and filters.
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211 foreach ($query->fields as &$field_info) {
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212 // Some fields don't actually have tables, meaning they're formulae and
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213 // whatnot. At this time we are going to ignore those.
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214 if (empty($field_info['table'])) {
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215 continue;
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216 }
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217
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218 // Dereference the alias into the actual table.
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219 $table = $table_queue[$field_info['table']]['table'];
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220 if ($table == $base_entity_table && in_array($field_info['field'], $revisionable_fields)) {
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221 $relationship = $table_queue[$field_info['table']]['alias'];
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222 $alias = $this->ensureRevisionTable($entity_type, $query, $relationship);
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223 if ($alias) {
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224 // Change the base table to use the revision table instead.
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225 $field_info['table'] = $alias;
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226 }
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227 }
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228 }
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229
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230 $relationships = [];
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231 // Build a list of all relationships that might be for our table.
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232 foreach ($query->relationships as $relationship => $info) {
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233 if ($info['base'] == $base_entity_table) {
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234 $relationships[] = $relationship;
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235 }
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236 }
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237
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238 // Now we have to go through our where clauses and modify any of our fields.
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239 foreach ($query->where as &$clauses) {
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240 foreach ($clauses['conditions'] as &$where_info) {
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241 // Build a matrix of our possible relationships against fields we need
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242 // to switch.
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243 foreach ($relationships as $relationship) {
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244 foreach ($revisionable_fields as $field) {
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245 if (is_string($where_info['field']) && $where_info['field'] == "$relationship.$field") {
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246 $alias = $this->ensureRevisionTable($entity_type, $query, $relationship);
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247 if ($alias) {
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248 // Change the base table to use the revision table instead.
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249 $where_info['field'] = "$alias.$field";
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250 }
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251 }
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252 }
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253 }
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254 }
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255 }
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256
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257 // @todo Handle $query->orderby, $query->groupby, $query->having and
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258 // $query->count_field in https://www.drupal.org/node/2968165.
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259 }
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260
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261 /**
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262 * Adds the 'workspace_association' table to a views query.
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263 *
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264 * @param string $entity_type_id
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265 * The ID of the entity type to join.
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266 * @param \Drupal\views\Plugin\views\query\Sql $query
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267 * The query plugin object for the query.
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268 * @param string $relationship
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269 * The primary table alias this table is related to.
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270 *
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271 * @return string
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272 * The alias of the 'workspace_association' table.
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273 */
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274 protected function ensureWorkspaceAssociationTable($entity_type_id, Sql $query, $relationship) {
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275 if (isset($query->tables[$relationship]['workspace_association'])) {
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276 return $query->tables[$relationship]['workspace_association']['alias'];
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277 }
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278
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279 $table_data = $this->viewsData->get($query->relationships[$relationship]['base']);
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280
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281 // Construct the join.
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282 $definition = [
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283 'table' => 'workspace_association',
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284 'field' => 'target_entity_id',
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285 'left_table' => $relationship,
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286 'left_field' => $table_data['table']['base']['field'],
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287 'extra' => [
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288 [
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289 'field' => 'target_entity_type_id',
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290 'value' => $entity_type_id,
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291 ],
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292 [
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293 'field' => 'workspace',
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294 'value' => $this->workspaceManager->getActiveWorkspace()->id(),
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295 ],
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296 ],
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297 'type' => 'LEFT',
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298 ];
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299
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300 $join = $this->viewsJoinPluginManager->createInstance('standard', $definition);
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301 $join->adjusted = TRUE;
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302
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303 return $query->queueTable('workspace_association', $relationship, $join);
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304 }
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305
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306 /**
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307 * Adds the revision table of an entity type to a query object.
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308 *
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309 * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
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310 * The entity type definition.
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311 * @param \Drupal\views\Plugin\views\query\Sql $query
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312 * The query plugin object for the query.
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313 * @param string $relationship
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314 * The name of the relationship.
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315 *
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316 * @return string
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317 * The alias of the relationship.
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318 */
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319 protected function ensureRevisionTable(EntityTypeInterface $entity_type, Sql $query, $relationship) {
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320 // Get the alias for the 'workspace_association' table we chain off of in
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321 // the COALESCE.
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322 $workspace_association_table = $this->ensureWorkspaceAssociationTable($entity_type->id(), $query, $relationship);
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323
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324 // Get the name of the revision table and revision key.
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325 $base_revision_table = $entity_type->isTranslatable() ? $entity_type->getRevisionDataTable() : $entity_type->getRevisionTable();
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326 $revision_field = $entity_type->getKey('revision');
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327
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328 // If the table was already added and has a join against the same field on
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329 // the revision table, reuse that rather than adding a new join.
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330 if (isset($query->tables[$relationship][$base_revision_table])) {
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331 $table_queue =& $query->getTableQueue();
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332 $alias = $query->tables[$relationship][$base_revision_table]['alias'];
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333 if (isset($table_queue[$alias]['join']->field) && $table_queue[$alias]['join']->field == $revision_field) {
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334 // If this table previously existed, but was not added by us, we need
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335 // to modify the join and make sure that 'workspace_association' comes
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336 // first.
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337 if (empty($table_queue[$alias]['join']->workspace_adjusted)) {
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338 $table_queue[$alias]['join'] = $this->getRevisionTableJoin($relationship, $base_revision_table, $revision_field, $workspace_association_table);
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339 // We also have to ensure that our 'workspace_association' comes before
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340 // this.
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341 $this->moveEntityTable($query, $workspace_association_table, $alias);
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342 }
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343
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344 return $alias;
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345 }
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346 }
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347
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348 // Construct a new join.
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349 $join = $this->getRevisionTableJoin($relationship, $base_revision_table, $revision_field, $workspace_association_table);
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350 return $query->queueTable($base_revision_table, $relationship, $join);
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351 }
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352
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353 /**
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354 * Fetches a join for a revision table using the workspace_association table.
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355 *
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356 * @param string $relationship
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357 * The relationship to use in the view.
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358 * @param string $table
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359 * The table name.
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360 * @param string $field
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361 * The field to join on.
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362 * @param string $workspace_association_table
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363 * The alias of the 'workspace_association' table joined to the main entity
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364 * table.
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365 *
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366 * @return \Drupal\views\Plugin\views\join\JoinPluginInterface
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367 * An adjusted views join object to add to the query.
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368 */
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369 protected function getRevisionTableJoin($relationship, $table, $field, $workspace_association_table) {
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370 $definition = [
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371 'table' => $table,
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372 'field' => $field,
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373 // Making this explicitly null allows the left table to be a formula.
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374 'left_table' => NULL,
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375 'left_field' => "COALESCE($workspace_association_table.target_entity_revision_id, $relationship.$field)",
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376 ];
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377
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378 /** @var \Drupal\views\Plugin\views\join\JoinPluginInterface $join */
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379 $join = $this->viewsJoinPluginManager->createInstance('standard', $definition);
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380 $join->adjusted = TRUE;
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381 $join->workspace_adjusted = TRUE;
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382
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383 return $join;
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384 }
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385
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386 /**
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387 * Moves a 'workspace_association' table to appear before the given alias.
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388 *
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389 * Because Workspace chains possibly pre-existing tables onto the
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390 * 'workspace_association' table, we have to ensure that the
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391 * 'workspace_association' table appears in the query before the alias it's
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392 * chained on or the SQL is invalid.
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393 *
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394 * @param \Drupal\views\Plugin\views\query\Sql $query
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395 * The SQL query object.
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396 * @param string $workspace_association_table
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397 * The alias of the 'workspace_association' table.
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398 * @param string $alias
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399 * The alias of the table it needs to appear before.
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400 */
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401 protected function moveEntityTable(Sql $query, $workspace_association_table, $alias) {
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402 $table_queue =& $query->getTableQueue();
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403 $keys = array_keys($table_queue);
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404 $current_index = array_search($workspace_association_table, $keys);
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405 $index = array_search($alias, $keys);
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406
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407 // If it's already before our table, we don't need to move it, as we could
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408 // accidentally move it forward.
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409 if ($current_index < $index) {
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410 return;
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411 }
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412 $splice = [$workspace_association_table => $table_queue[$workspace_association_table]];
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413 unset($table_queue[$workspace_association_table]);
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414
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415 // Now move the item to the proper location in the array. Don't use
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416 // array_splice() because that breaks indices.
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417 $table_queue = array_slice($table_queue, 0, $index, TRUE) +
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418 $splice +
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419 array_slice($table_queue, $index, NULL, TRUE);
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420 }
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421
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422 }
|