Add a method to query IPP printers for attributes.

chrome/browser/chromeos/printing/printer_info_cups.cc

Index: chrome/browser/chromeos/printing/printer_info_cups.cc
diff --git a/chrome/browser/chromeos/printing/printer_info_cups.cc b/chrome/browser/chromeos/printing/printer_info_cups.cc
new file mode 100644
index 0000000000000000000000000000000000000000..cea92b434ea9c159b7e21e94b9036f4f9153fa99
--- /dev/null
+++ b/chrome/browser/chromeos/printing/printer_info_cups.cc
@@ -0,0 +1,117 @@
+// Copyright 2017 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 "chrome/browser/chromeos/printing/printer_info.h"
+
+#include <algorithm>
+#include <string>
+
+#include "base/logging.h"
+#include "base/memory/ptr_util.h"
+#include "base/strings/string_piece.h"
+#include "base/task_runner_util.h"
+#include "base/task_scheduler/post_task.h"
+#include "base/task_scheduler/task_traits.h"
+#include "base/version.h"
+#include "printing/backend/cups_jobs.h"
+
+namespace {
+
+const char kPdfMimeType[] = "application/pdf";
+const char kPwgRasterMimeType[] = "image/pwg-raster";
+
+// Returns true if any of the |ipp_versions| are greater than or equal to 2.0.
+bool AllowedIpp(const std::vector<base::Version>& ipp_versions) {
+  const std::vector<uint32_t> components = {2, 0};

[Lei Zhang, 2017/05/31 23:00:03]

Make these 2 consts static. See the storage duration section of
http://en.cppreference.com/w/cpp/language/storage_duration

[skau, 2017/06/01 22:50:45]

Done.

+  const base::Version two_dot_zero(components);
+  auto found = std::find_if(ipp_versions.begin(), ipp_versions.end(),
+                            [&two_dot_zero](const base::Version& version) {
+                              return version >= two_dot_zero;
+                            });
+
+  return found != ipp_versions.end();
+}
+
+// Returns true if |mime_type| is one of the supported types.
+bool SupportedMime(const std::string& mime_type) {
+  return mime_type == kPwgRasterMimeType || mime_type == kPdfMimeType;
+}
+
+// Returns true if |formats| contains one of the supported printer description
+// languages for an autoconf printer identified by MIME type.
+bool SupportsRequiredPDLS(const std::vector<std::string>& formats) {
+  auto found = std::find_if(formats.begin(), formats.end(), &SupportedMime);
+  return found != formats.end();
+}
+
+// Returns true if |info| describes a printer for which we want to attempt
+// automatic configuration.
+bool IsAutoconf(const ::printing::PrinterInfo& info) {
+  return info.ipp_everywhere || (AllowedIpp(info.ipp_versions) &&
+                                 SupportsRequiredPDLS(info.document_formats));
+}
+
+// Dispatches an IPP request to |host| to retrieve printer information.  Returns
+// a nullptr if the request fails.
+std::unique_ptr<::printing::PrinterInfo> QueryPrinterImpl(
+    const std::string& host,
+    const int port,
+    const std::string& path) {
+  auto info = base::MakeUnique<::printing::PrinterInfo>();
+  if (!::printing::GetPrinterInfo(host, port, path, info.get())) {
+    LOG(ERROR) << "Could not retrieve printer info";
+    return nullptr;
+  }
+
+  return info;
+}
+
+// Handles the request for |info|.  Parses make and model information before
+// calling |callback|.
+void OnPrinterQueried(const chromeos::PrinterInfoCallback& callback,
+                      std::unique_ptr<::printing::PrinterInfo> info) {
+  if (!info) {
+    VLOG(1) << "Could not reach printer";
+    callback.Run(false, std::string(), std::string(), false);
+    return;
+  }
+
+  // TODO(skau): Handle manufacturers with two word names.
+  base::StringPiece make_and_model(info->make_and_model);
+  base::StringPiece make;
+  base::StringPiece model;
+
+  size_t first_space = make_and_model.find(" ");
+  if (first_space != base::StringPiece::npos) {
+    make = make_and_model.substr(0, first_space);
+    model = make_and_model.substr(first_space + 1);
+  } else {
+    // If there's only one word or an empty string, use it.
+    model = make_and_model;
+  }
+
+  callback.Run(true, make.as_string(), model.as_string(), IsAutoconf(*info));
+}
+
+}  // namespace
+
+namespace chromeos {
+
+void QueryIppPrinter(const std::string& host,
+                     const int port,
+                     const std::string& path,
+                     const PrinterInfoCallback& callback) {
+  DCHECK(!host.empty());
+
+  // QueryPrinterImpl could block on a network call for a noticable amount of
+  // time (100s of ms). Also the user is waiting on this result.  Thus, run at
+  // USER_VISIBLE with MayBlock.
+  base::PostTaskWithTraitsAndReplyWithResult(
+      FROM_HERE,
+      base::TaskTraits(base::TaskPriority::USER_VISIBLE, base::MayBlock()),
+      base::Bind(&QueryPrinterImpl, host, port, path),
+      base::Bind(&OnPrinterQueried, callback));
+}
+
+}  // namespace chromeos