Revert of Move remote_db_manager into the safe_browsing_db component.

components/safe_browsing_db/safe_browsing_api_handler_util.cc

-// Copyright 2015 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 "components/safe_browsing_db/safe_browsing_api_handler_util.h"
-
-#include <stddef.h>
-
-#include <string>
-
-#include "base/json/json_reader.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/metrics/histogram_macros.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/values.h"
-#include "components/safe_browsing_db/metadata.pb.h"
-#include "components/safe_browsing_db/util.h"
-
-namespace safe_browsing {
-namespace {
-
-// JSON metatdata keys. These are are fixed in the Java-side API.
-const char kJsonKeyMatches[] = "matches";
-const char kJsonKeyThreatType[] = "threat_type";
-
-// Do not reorder or delete.  Make sure changes are reflected in
-// SB2RemoteCallThreatSubType.
-enum UmaThreatSubType {
-  UMA_THREAT_SUB_TYPE_NOT_SET = 0,
-  UMA_THREAT_SUB_TYPE_LANDING = 1,
-  UMA_THREAT_SUB_TYPE_DISTRIBUTION = 2,
-  UMA_THREAT_SUB_TYPE_UNKNOWN = 3,
-  UMA_THREAT_SUB_TYPE_MAX_VALUE
-};
-
-void ReportUmaThreatSubType(SBThreatType threat_type,
-                            UmaThreatSubType sub_type) {
-  if (threat_type == SB_THREAT_TYPE_URL_MALWARE) {
-    UMA_HISTOGRAM_ENUMERATION(
-        "SB2.RemoteCall.ThreatSubType.PotentiallyHarmfulApp", sub_type,
-        UMA_THREAT_SUB_TYPE_MAX_VALUE);
-  } else {
-    UMA_HISTOGRAM_ENUMERATION("SB2.RemoteCall.ThreatSubType.SocialEngineering",
-                              sub_type, UMA_THREAT_SUB_TYPE_MAX_VALUE);
-  }
-}
-
-// Parse the extra key/value pair(s) added by Safe Browsing backend.  To make
-// it binary compatible with the Pver3 metadata that UIManager expects to
-// deserialize, we convert it to a MalwarePatternType.
-//
-// TODO(nparker):  When chrome desktop is converted to use Pver4, convert this
-// to the new proto instead.
-const std::string ParseExtraMetadataToPB(const base::DictionaryValue* match,
-                                         SBThreatType threat_type) {
-  std::string pattern_key;
-  if (threat_type == SB_THREAT_TYPE_URL_MALWARE) {
-    pattern_key = "pha_pattern_type";
-  } else {
-    DCHECK(threat_type == SB_THREAT_TYPE_URL_PHISHING);
-    pattern_key = "se_pattern_type";
-  }
-
-  std::string pattern_type;
-  if (!match->GetString(pattern_key, &pattern_type)) {
-    ReportUmaThreatSubType(threat_type, UMA_THREAT_SUB_TYPE_NOT_SET);
-    return std::string();
-  }
-
-  MalwarePatternType pb;
-  if (pattern_type == "LANDING") {
-    pb.set_pattern_type(MalwarePatternType::LANDING);
-    ReportUmaThreatSubType(threat_type, UMA_THREAT_SUB_TYPE_LANDING);
-  } else if (pattern_type == "DISTRIBUTION") {
-    pb.set_pattern_type(MalwarePatternType::DISTRIBUTION);
-    ReportUmaThreatSubType(threat_type, UMA_THREAT_SUB_TYPE_DISTRIBUTION);
-  } else {
-    ReportUmaThreatSubType(threat_type, UMA_THREAT_SUB_TYPE_UNKNOWN);
-    return std::string();
-  }
-
-  return pb.SerializeAsString();
-}
-
-int GetThreatSeverity(int java_threat_num) {
-  // Assign higher numbers to more severe threats.
-  switch (java_threat_num) {
-    case JAVA_THREAT_TYPE_POTENTIALLY_HARMFUL_APPLICATION:
-      return 2;
-    case JAVA_THREAT_TYPE_SOCIAL_ENGINEERING:
-      return 1;
-    default:
-      // Unknown threat type
-      return -1;
-  }
-}
-
-SBThreatType JavaToSBThreatType(int java_threat_num) {
-  switch (java_threat_num) {
-    case JAVA_THREAT_TYPE_POTENTIALLY_HARMFUL_APPLICATION:
-      return SB_THREAT_TYPE_URL_MALWARE;
-    case JAVA_THREAT_TYPE_SOCIAL_ENGINEERING:
-      return SB_THREAT_TYPE_URL_PHISHING;
-    default:
-      // Unknown threat type
-      return SB_THREAT_TYPE_SAFE;
-  }
-}
-
-}  // namespace
-
-// Valid examples:
-// {"matches":[{"threat_type":"5"}]}
-//   or
-// {"matches":[{"threat_type":"4"},
-//             {"threat_type":"5", "se_pattern_type":"LANDING"}]}
-UmaRemoteCallResult ParseJsonToThreatAndPB(const std::string& metadata_str,
-                                           SBThreatType* worst_threat,
-                                           std::string* metadata_pb_str) {
-  *worst_threat = SB_THREAT_TYPE_SAFE;  // Default to safe.
-  *metadata_pb_str = std::string();
-
-  if (metadata_str.empty())
-    return UMA_STATUS_JSON_EMPTY;
-
-  // Pick out the "matches" list.
-  scoped_ptr<base::Value> value = base::JSONReader::Read(metadata_str);
-  const base::ListValue* matches;
-  if (!value.get() || !value->IsType(base::Value::TYPE_DICTIONARY) ||
-      !(static_cast<base::DictionaryValue*>(value.get()))
-           ->GetList(kJsonKeyMatches, &matches)) {
-    return UMA_STATUS_JSON_FAILED_TO_PARSE;
-  }
-
-  // Go through each matched threat type and pick the most severe.
-  int worst_threat_num = -1;
-  const base::DictionaryValue* worst_match = nullptr;
-  for (size_t i = 0; i < matches->GetSize(); i++) {
-    // Get the threat number
-    const base::DictionaryValue* match;
-    std::string threat_num_str;
-    int java_threat_num = -1;
-    if (!matches->GetDictionary(i, &match) ||
-        !match->GetString(kJsonKeyThreatType, &threat_num_str) ||
-        !base::StringToInt(threat_num_str, &java_threat_num)) {
-      continue;  // Skip malformed list entries
-    }
-
-    if (GetThreatSeverity(java_threat_num) >
-        GetThreatSeverity(worst_threat_num)) {
-      worst_threat_num = java_threat_num;
-      worst_match = match;
-    }
-  }
-
-  *worst_threat = JavaToSBThreatType(worst_threat_num);
-  if (*worst_threat == SB_THREAT_TYPE_SAFE || !worst_match)
-    return UMA_STATUS_JSON_UNKNOWN_THREAT;
-  *metadata_pb_str = ParseExtraMetadataToPB(worst_match, *worst_threat);
-
-  return UMA_STATUS_UNSAFE;  // success
-}
-
-}  // namespace safe_browsing