Move basic API permissions code out of //chrome

chrome/common/extensions/permissions/permission_message_util.cc

-// Copyright 2013 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/common/extensions/permissions/permission_message_util.h"
-
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/utf_string_conversions.h"
-#include "content/public/common/url_constants.h"
-#include "extensions/common/permissions/permission_message.h"
-#include "extensions/common/permissions/permission_set.h"
-#include "extensions/common/url_pattern_set.h"
-#include "grit/generated_resources.h"
-#include "net/base/registry_controlled_domains/registry_controlled_domain.h"
-#include "ui/base/l10n/l10n_util.h"
-
-using extensions::PermissionMessage;
-using extensions::PermissionSet;
-using extensions::URLPatternSet;
-
-namespace {
-
-// Helper for GetDistinctHosts(): com > net > org > everything else.
-bool RcdBetterThan(const std::string& a, const std::string& b) {
-  if (a == b)
-    return false;
-  if (a == "com")
-    return true;
-  if (a == "net")
-    return b != "com";
-  if (a == "org")
-    return b != "com" && b != "net";
-  return false;
-}
-
-}  // namespace
-
-namespace permission_message_util {
-
-PermissionMessage CreateFromHostList(const std::set<std::string>& hosts) {
-  std::vector<std::string> host_list(hosts.begin(), hosts.end());
-  DCHECK(host_list.size());
-  PermissionMessage::ID message_id;
-  base::string16 message;
-  base::string16 details;
-
-  switch (host_list.size()) {
-    case 1:
-      message_id = PermissionMessage::kHosts1;
-      message = l10n_util::GetStringFUTF16(IDS_EXTENSION_PROMPT_WARNING_1_HOST,
-                                           base::UTF8ToUTF16(host_list[0]));
-      break;
-    case 2:
-      message_id = PermissionMessage::kHosts2;
-      message = l10n_util::GetStringFUTF16(IDS_EXTENSION_PROMPT_WARNING_2_HOSTS,
-                                           base::UTF8ToUTF16(host_list[0]),
-                                           base::UTF8ToUTF16(host_list[1]));
-      break;
-    case 3:
-      message_id = PermissionMessage::kHosts3;
-      message = l10n_util::GetStringFUTF16(IDS_EXTENSION_PROMPT_WARNING_3_HOSTS,
-                                           base::UTF8ToUTF16(host_list[0]),
-                                           base::UTF8ToUTF16(host_list[1]),
-                                           base::UTF8ToUTF16(host_list[2]));
-      break;
-    default:
-      message_id = PermissionMessage::kHosts4OrMore;
-
-      const int kRetainedFilesMessageIDs[6] = {
-          IDS_EXTENSION_PROMPT_WARNING_HOSTS_DEFAULT,
-          IDS_EXTENSION_PROMPT_WARNING_HOST_SINGULAR,
-          IDS_EXTENSION_PROMPT_WARNING_HOSTS_ZERO,
-          IDS_EXTENSION_PROMPT_WARNING_HOSTS_TWO,
-          IDS_EXTENSION_PROMPT_WARNING_HOSTS_FEW,
-          IDS_EXTENSION_PROMPT_WARNING_HOSTS_MANY,
-      };
-      std::vector<int> message_ids;
-      for (size_t i = 0; i < arraysize(kRetainedFilesMessageIDs); i++) {
-        message_ids.push_back(kRetainedFilesMessageIDs[i]);
-      }
-      message = l10n_util::GetPluralStringFUTF16(message_ids, host_list.size());
-
-      for (size_t i = 0; i < host_list.size(); ++i) {
-        if (i > 0)
-          details += base::ASCIIToUTF16("\n");
-        details += l10n_util::GetStringFUTF16(
-            IDS_EXTENSION_PROMPT_WARNING_HOST_LIST_ENTRY,
-            base::UTF8ToUTF16(host_list[i]));
-      }
-  }
-
-  return PermissionMessage(message_id, message, details);
-}
-
-std::set<std::string> GetDistinctHosts(
-    const URLPatternSet& host_patterns,
-    bool include_rcd,
-    bool exclude_file_scheme) {
-  // Use a vector to preserve order (also faster than a map on small sets).
-  // Each item is a host split into two parts: host without RCDs and
-  // current best RCD.
-  typedef std::vector<std::pair<std::string, std::string> > HostVector;
-  HostVector hosts_best_rcd;
-  for (URLPatternSet::const_iterator i = host_patterns.begin();
-       i != host_patterns.end(); ++i) {
-    if (exclude_file_scheme && i->scheme() == content::kFileScheme)
-      continue;
-
-    std::string host = i->host();
-
-    // Add the subdomain wildcard back to the host, if necessary.
-    if (i->match_subdomains())
-      host = "*." + host;
-
-    // If the host has an RCD, split it off so we can detect duplicates.
-    std::string rcd;
-    size_t reg_len = net::registry_controlled_domains::GetRegistryLength(
-        host,
-        net::registry_controlled_domains::EXCLUDE_UNKNOWN_REGISTRIES,
-        net::registry_controlled_domains::EXCLUDE_PRIVATE_REGISTRIES);
-    if (reg_len && reg_len != std::string::npos) {
-      if (include_rcd)  // else leave rcd empty
-        rcd = host.substr(host.size() - reg_len);
-      host = host.substr(0, host.size() - reg_len);
-    }
-
-    // Check if we've already seen this host.
-    HostVector::iterator it = hosts_best_rcd.begin();
-    for (; it != hosts_best_rcd.end(); ++it) {
-      if (it->first == host)
-        break;
-    }
-    // If this host was found, replace the RCD if this one is better.
-    if (it != hosts_best_rcd.end()) {
-      if (include_rcd && RcdBetterThan(rcd, it->second))
-        it->second = rcd;
-    } else {  // Previously unseen host, append it.
-      hosts_best_rcd.push_back(std::make_pair(host, rcd));
-    }
-  }
-
-  // Build up the final vector by concatenating hosts and RCDs.
-  std::set<std::string> distinct_hosts;
-  for (HostVector::iterator it = hosts_best_rcd.begin();
-       it != hosts_best_rcd.end(); ++it)
-    distinct_hosts.insert(it->first + it->second);
-  return distinct_hosts;
-}
-
-}  // namespace permission_message_util