Connect BackgroundFetch to the OfflineItemCollection

content/browser/background_fetch/background_fetch_registration_id.cc

 // 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 "content/browser/background_fetch/background_fetch_registration_id.h"
 
+#include <iterator>
+#include <sstream>
 #include <tuple>
 
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_split.h"
+#include "base/strings/stringprintf.h"
 #include "content/common/service_worker/service_worker_types.h"
 
 namespace content {
 
+namespace {
+
+const int kSerializationVersion = 0;
+const char kSeparator = '#';
+
+}  // namespace
+
 BackgroundFetchRegistrationId::BackgroundFetchRegistrationId()
     : service_worker_registration_id_(kInvalidServiceWorkerRegistrationId) {}
 
 BackgroundFetchRegistrationId::BackgroundFetchRegistrationId(
     int64_t service_worker_registration_id,
     const url::Origin& origin,
     const std::string& tag)
     : service_worker_registration_id_(service_worker_registration_id),
       origin_(origin),
       tag_(tag) {}
 
 BackgroundFetchRegistrationId::BackgroundFetchRegistrationId(
     const BackgroundFetchRegistrationId& other) = default;
 
 BackgroundFetchRegistrationId::BackgroundFetchRegistrationId(
     BackgroundFetchRegistrationId&& other) = default;
 
 BackgroundFetchRegistrationId::~BackgroundFetchRegistrationId() = default;
 
+// Serialization format is:
+// version#service_worker_registration_id#origin#tag
+std::string BackgroundFetchRegistrationId::Serialize() const {
+  return base::StringPrintf(
+      "%d%c%s%c%s%c%s", kSerializationVersion, kSeparator,

[David Trainor- moved to gerrit, 2017/04/18 22:15:55]

Would encoding/decoding these as url parameters be a (potentially odd but safer)
way to save the parameters?  I saw a different feature did that when they had to
serialize a bunch of things as a string.  Just an idea, fine either way :).

[Peter Beverloo, 2017/04/18 23:12:08]

Do you know if we have common code for compiling and splitting up key/value
pairs in a query string? Especially since the |tag| can contain any character,
recreating encode/decode logic would likely end up more complicated than this.
(Even though it'd be useful.)

[David Trainor- moved to gerrit, 2017/04/19 22:45:12]

ContentSuggestionsNotificationHelper.java uses a Uri.Builder in Java.  I guess
URL encoding should make it all 'work'?

+      base::Int64ToString(service_worker_registration_id_).c_str(), kSeparator,
+      origin_.Serialize().c_str(), kSeparator, tag_.c_str());
+}
+
+// static
+bool BackgroundFetchRegistrationId::Deserialize(
+    const std::string& serialized_registration_id,
+    BackgroundFetchRegistrationId* out_registration_id) {
+  DCHECK(out_registration_id);
+  std::vector<std::string> parts =
+      base::SplitString(serialized_registration_id, std::string(1, kSeparator),
+                        base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
+  if (parts.size() <= 3)
+    return false;
+
+  // Currently, only a single version is supported.
+  int serialization_version;
+  if ((!base::StringToInt(parts[0], &serialization_version)) ||
+      (kSerializationVersion != serialization_version))

[Peter Beverloo, 2017/04/18 23:12:08]

nit: remove the extra () (twice), brackets since it's a multi-line statement

[harkness, 2017/04/19 09:03:41]

Done.

+    return false;
+
+  if (!base::StringToInt64(
+          parts[1], &out_registration_id->service_worker_registration_id_)) {
+    return false;
+  }
+
+  out_registration_id->origin_ = url::Origin(GURL(parts[2]));
+  if (out_registration_id->origin_.unique())
+    return false;
+
+  std::ostringstream tag;
+  tag << parts[3];
+
+  // It's valid for a tag to contain the |kSeparator|, so concatenate further
+  // parts, if any, with the |tag|. This should be a rare case.
+  for (size_t i = 4; i < parts.size(); i++)
+    tag << kSeparator << parts[i];
+
+  out_registration_id->tag_ = tag.str();
+
+  // The tag must be a non-empty string.
+  return !out_registration_id->tag_.empty();
+}
+
 BackgroundFetchRegistrationId& BackgroundFetchRegistrationId::operator=(
     const BackgroundFetchRegistrationId& other) = default;
 
 bool BackgroundFetchRegistrationId::operator==(
     const BackgroundFetchRegistrationId& other) const {
   return other.service_worker_registration_id_ ==
              service_worker_registration_id_ &&
          other.origin_ == origin_ && other.tag_ == tag_;
 }
 
 bool BackgroundFetchRegistrationId::operator!=(
     const BackgroundFetchRegistrationId& other) const {
   return !(*this == other);
 }
 
 bool BackgroundFetchRegistrationId::operator<(
     const BackgroundFetchRegistrationId& other) const {
   return std::tie(service_worker_registration_id_, origin_, tag_) <
          std::tie(other.service_worker_registration_id_, other.origin_,
                   other.tag_);
 }
 
 bool BackgroundFetchRegistrationId::is_null() const {
   return service_worker_registration_id_ == kInvalidServiceWorkerRegistrationId;
 }
 
 }  // namespace content