Create a new print backend for the updated CUPS APIs

printing/backend/print_backend_cups_ipp.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "printing/backend/print_backend_cups_ipp.h"
+
+#include <cups/cups.h>
+#include <dlfcn.h>
+#include <errno.h>
+#include <pthread.h>
+
+#include <vector>
+
+#include "base/debug/leak_annotations.h"
+#include "base/files/file_util.h"
+#include "base/lazy_instance.h"
+#include "base/logging.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_split.h"
+#include "base/strings/string_util.h"
+#include "base/synchronization/lock.h"
+#include "base/values.h"
+#include "printing/backend/cups_connection.h"
+#include "printing/backend/cups_ipp_util.h"
+#include "printing/backend/print_backend_consts.h"
+#include "printing/units.h"
+#include "url/gurl.h"
+
+namespace printing {
+
+PrintBackendCupsIpp::PrintBackendCupsIpp(CupsConnection&& cups_connection)
+    : cups_connection_(std::move(cups_connection)) {}
+
+bool PrintBackendCupsIpp::EnumeratePrinters(PrinterList* printer_list) {
+  DCHECK(printer_list);
+  printer_list->clear();
+
+  std::vector<CupsPrinter> printers = cups_connection_.GetDests();
+  if (printers.empty()) {
+    LOG(WARNING) << "CUPS: Error getting printers from CUPS server"
+                 << ", server: " << cups_connection_.server_name()
+                 << ", error: "
+                 << static_cast<int>(cups_connection_.last_error());
+
+    return false;
+  }
+
+  for (const auto& printer : printers) {
+    PrinterBasicInfo basic_info;
+    if (printer.ToPrinterInfo(&basic_info)) {
+      printer_list->push_back(std::move(basic_info));

[Lei Zhang, 2016/07/13 01:08:43]

I don't think the std::move() works here. You still end up calling the copy
constructor.

[skau, 2016/07/14 20:43:06]

Yes.  PrintBasicInfo doesn't have a move constructor so it ends up calling the
copy constructor anyway.

+    }
+  }
+
+  return true;
+}
+
+std::string PrintBackendCupsIpp::GetDefaultPrinterName() {
+  std::vector<CupsPrinter> printers = cups_connection_.GetDests();
+  for (const auto& printer : printers) {
+    if (printer.is_default()) {
+      return printer.GetName();
+    }
+  }
+
+  return "";

[Lei Zhang, 2016/07/13 01:08:43]

return std::string();

[skau, 2016/07/14 20:43:06]

Done.

+}
+
+bool PrintBackendCupsIpp::GetPrinterBasicInfo(const std::string& printer_name,
+                                              PrinterBasicInfo* printer_info) {
+  std::unique_ptr<CupsPrinter> printer(
+      cups_connection_.GetPrinter(printer_name));
+  if (!printer || !printer->IsAvailable())
+    return false;
+
+  DCHECK_EQ(printer_name, printer->GetName());
+
+  return printer->ToPrinterInfo(printer_info);
+}
+
+bool PrintBackendCupsIpp::GetPrinterSemanticCapsAndDefaults(
+    const std::string& printer_name,
+    PrinterSemanticCapsAndDefaults* printer_info) {
+  std::unique_ptr<CupsPrinter> printer(
+      cups_connection_.GetPrinter(printer_name));
+  if (!printer)
+    return false;
+
+  ExtractCollate(*printer, printer_info);
+  ExtractCopies(*printer, printer_info);
+  ExtractDuplex(*printer, printer_info);
+  ExtractColor(*printer, printer_info);
+  ExtractPaper(*printer, printer_info);
+
+  // TODO(skau): Add dpi and default_dpi
+
+  return true;
+}
+
+bool PrintBackendCupsIpp::GetPrinterCapsAndDefaults(
+    const std::string& printer_name,
+    PrinterCapsAndDefaults* printer_info) {
+  DCHECK(printer_info);
+
+  // Read the ppd file for Cloud Print.  We don't use PPD anymore otherwise.
+  std::unique_ptr<CupsPrinter> printer(
+      cups_connection_.GetPrinter(printer_name));
+  if (!printer)
+    return false;
+
+  base::FilePath ppd_path(printer->GetPPD());
+  // In some cases CUPS failed to get ppd file.
+  if (ppd_path.empty()) {
+    LOG(ERROR) << "CUPS: Failed to get PPD, printer name: " << printer_name;
+    return false;
+  }
+
+  std::string content;
+  bool res = base::ReadFileToString(ppd_path, &content);
+
+  base::DeleteFile(ppd_path, false);
+
+  if (res) {
+    printer_info->printer_capabilities.swap(content);
+    printer_info->caps_mime_type = "application/pagemaker";
+    // In CUPS, printer defaults is a part of PPD file. Nothing to upload here.
+    printer_info->printer_defaults.clear();
+    printer_info->defaults_mime_type.clear();
+  }
+
+  return res;
+}
+
+std::string PrintBackendCupsIpp::GetPrinterDriverInfo(
+    const std::string& printer_name) {
+  std::unique_ptr<CupsPrinter> printer(
+      cups_connection_.GetPrinter(printer_name));
+  if (!printer || !printer->IsAvailable())
+    return std::string();
+
+  DCHECK_EQ(printer_name, printer->GetName());
+  return printer->GetMakeAndModel();
+}
+
+bool PrintBackendCupsIpp::IsValidPrinter(const std::string& printer_name) {
+  std::unique_ptr<CupsPrinter> printer(
+      cups_connection_.GetPrinter(printer_name));
+  if (!printer)
+    return false;
+
+  return printer->IsAvailable();
+}
+
+}  // namespace printing