wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php:659Checks if a given request has access to create a post.
$requestWP_REST_Requesttrue|WP_Error public function create_item_permissions_check( $request ) { if ( ! empty( $request['id'] ) ) { return new WP_Error( 'rest_post_exists', __( 'Cannot create existing post.' ), array( 'status' => 400 ) ); } $post_type = get_post_type_object( $this->post_type ); if ( ! empty( $request['author'] ) && get_current_user_id() !== $request['author'] && ! current_user_can( $post_type->cap->edit_others_posts ) ) { return new WP_Error( 'rest_cannot_edit_others', __( 'Sorry, you are not allowed to create posts as this user.' ), array( 'status' => rest_authorization_required_code() ) ); } if ( ! empty( $request['sticky'] ) && ! current_user_can( $post_type->cap->edit_others_posts ) && ! current_user_can( $post_type->cap->publish_posts ) ) { return new WP_Error( 'rest_cannot_assign_sticky', __( 'Sorry, you are not allowed to make posts sticky.' ), array( 'status' => rest_authorization_required_code() ) ); } if ( ! current_user_can( $post_type->cap->create_posts ) ) { return new WP_Error( 'rest_cannot_create', __( 'Sorry, you are not allowed to create posts as this user.' ), array( 'status' => rest_authorization_required_code() ) ); } if ( ! $this->check_assign_terms_permission( $request ) ) { return new WP_Error( 'rest_cannot_assign_term', __( 'Sorry, you are not allowed to assign the provided terms.' ), array( 'status' => rest_authorization_required_code() ) ); } return true; }Introduced in 4.7.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.