WP_REST_Attachments_Controller::upload_from_data( string $data, array $headers, string|null $time = null ): array|WP_Error

1104	protected function upload_from_data( $data, $headers, $time = null ) {1105		if ( empty( $data ) ) {1106			return new WP_Error(1107				'rest_upload_no_data',1108				__( 'No data supplied.' ),1109				array( 'status' => 400 )1110			);1111		}1112 1113		if ( empty( $headers['content_type'] ) ) {1114			return new WP_Error(1115				'rest_upload_no_content_type',1116				__( 'No Content-Type supplied.' ),1117				array( 'status' => 400 )1118			);1119		}1120 1121		if ( empty( $headers['content_disposition'] ) ) {1122			return new WP_Error(1123				'rest_upload_no_content_disposition',1124				__( 'No Content-Disposition supplied.' ),1125				array( 'status' => 400 )1126			);1127		}1128 1129		$filename = self::get_filename_from_disposition( $headers['content_disposition'] );1130 1131		if ( empty( $filename ) ) {1132			return new WP_Error(1133				'rest_upload_invalid_disposition',1134				__( 'Invalid Content-Disposition supplied. Content-Disposition needs to be formatted as `attachment; filename="image.png"` or similar.' ),1135				array( 'status' => 400 )1136			);1137		}1138 1139		if ( ! empty( $headers['content_md5'] ) ) {1140			$content_md5 = array_shift( $headers['content_md5'] );1141			$expected    = trim( $content_md5 );1142			$actual      = md5( $data );1143 1144			if ( $expected !== $actual ) {1145				return new WP_Error(1146					'rest_upload_hash_mismatch',1147					__( 'Content hash did not match expected.' ),1148					array( 'status' => 412 )1149				);1150			}1151		}1152 1153		// Get the content-type.1154		$type = array_shift( $headers['content_type'] );1155 1156		// Include filesystem functions to get access to wp_tempnam() and wp_handle_sideload().1157		require_once ABSPATH . 'wp-admin/includes/file.php';1158 1159		// Save the file.1160		$tmpfname = wp_tempnam( $filename );1161 1162		$fp = fopen( $tmpfname, 'w+' );1163 1164		if ( ! $fp ) {1165			return new WP_Error(1166				'rest_upload_file_error',1167				__( 'Could not open file handle.' ),1168				array( 'status' => 500 )1169			);1170		}1171 1172		fwrite( $fp, $data );1173		fclose( $fp );1174 1175		// Now, sideload it in.1176		$file_data = array(1177			'error'    => null,1178			'tmp_name' => $tmpfname,1179			'name'     => $filename,1180			'type'     => $type,1181		);1182 1183		$size_check = self::check_upload_size( $file_data );