Componentize signin_header_helper.h (part 2)

This CL moves the cross-platform logic of the following methods to
the signin component:
BuildManageAccountsParamsIfExists()

BUG=332107
TBR=jochen

Review URL: https://codereview.chromium.org/1230583011

Cr-Commit-Position: refs/heads/master@{#339113}

2 files changed, 153 insertions, 0 deletions

diff --git a/components/signin/core/browser/signin_header_helper.cc b/components/signin/core/browser/signin_header_helper.cc
index d6ac68d..43a2efc 100644
--- a/components/signin/core/browser/signin_header_helper.cc
+++ b/components/signin/core/browser/signin_header_helper.cc
@@ -5,21 +5,33 @@
 #include "components/signin/core/browser/signin_header_helper.h"
 
 #include "base/strings/string_number_conversions.h"
+#include "base/strings/string_split.h"
 #include "base/strings/stringprintf.h"
 #include "components/content_settings/core/browser/cookie_settings.h"
 #include "components/google/core/browser/google_util.h"
 #include "components/signin/core/common/profile_management_switches.h"
 #include "google_apis/gaia/gaia_auth_util.h"
 #include "google_apis/gaia/gaia_urls.h"
+#include "net/base/escape.h"
+#include "net/http/http_response_headers.h"
 #include "net/url_request/url_request.h"
 #include "url/gurl.h"
 
 namespace {
 
+// Dictionary of fields in a mirror response header.
+typedef std::map<std::string, std::string> MirrorResponseHeaderDictionary;
+
 const char kChromeConnectedHeader[] = "X-Chrome-Connected";
+const char kChromeManageAccountsHeader[] = "X-Chrome-Manage-Accounts";
+const char kContinueUrlAttrName[] = "continue_url";
+const char kEmailAttrName[] = "email";
 const char kEnableAccountConsistencyAttrName[] = "enable_account_consistency";
 const char kGaiaIdAttrName[] = "id";
 const char kProfileModeAttrName[] = "mode";
+const char kIsSameTabAttrName[] = "is_same_tab";
+const char kIsSamlAttrName[] = "is_saml";
+const char kServiceTypeAttrName[] = "action";
 
 bool IsDriveOrigin(const GURL& url) {
   if (!url.SchemeIsCryptographic())
@@ -30,10 +42,89 @@ bool IsDriveOrigin(const GURL& url) {
   return url == kGoogleDriveURL || url == kGoogleDocsURL;
 }
 
+// Determines the service type that has been passed from GAIA in the header.
+signin::GAIAServiceType GetGAIAServiceTypeFromHeader(
+    const std::string& header_value) {
+  if (header_value == "SIGNOUT")
+    return signin::GAIA_SERVICE_TYPE_SIGNOUT;
+  else if (header_value == "INCOGNITO")
+    return signin::GAIA_SERVICE_TYPE_INCOGNITO;
+  else if (header_value == "ADDSESSION")
+    return signin::GAIA_SERVICE_TYPE_ADDSESSION;
+  else if (header_value == "REAUTH")
+    return signin::GAIA_SERVICE_TYPE_REAUTH;
+  else if (header_value == "SIGNUP")
+    return signin::GAIA_SERVICE_TYPE_SIGNUP;
+  else if (header_value == "DEFAULT")
+    return signin::GAIA_SERVICE_TYPE_DEFAULT;
+  else
+    return signin::GAIA_SERVICE_TYPE_NONE;
+}
+
+// Parses the mirror response header. Its expected format is
+// "key1=value1,key2=value2,...".
+MirrorResponseHeaderDictionary ParseMirrorResponseHeader(
+    const std::string& header_value) {
+  MirrorResponseHeaderDictionary dictionary;
+  for (const base::StringPiece& field :
+       base::SplitStringPiece(header_value, ",", base::KEEP_WHITESPACE,
+                              base::SPLIT_WANT_NONEMPTY)) {
+    size_t delim = field.find_first_of('=');
+    if (delim == std::string::npos) {
+      DLOG(WARNING) << "Unexpected GAIA header field '" << field << "'.";
+      continue;
+    }
+    dictionary[field.substr(0, delim).as_string()] =
+        net::UnescapeURLComponent(field.substr(delim + 1).as_string(),
+                                  net::UnescapeRule::URL_SPECIAL_CHARS);
+  }
+  return dictionary;
+}
+
+// Returns the parameters contained in the X-Chrome-Manage-Accounts response
+// header.
+signin::ManageAccountsParams BuildManageAccountsParams(
+    const std::string& header_value) {
+  signin::ManageAccountsParams params;
+  MirrorResponseHeaderDictionary header_dictionary =
+      ParseMirrorResponseHeader(header_value);
+  MirrorResponseHeaderDictionary::const_iterator it = header_dictionary.begin();
+  for (; it != header_dictionary.end(); ++it) {
+    const std::string key_name(it->first);
+    if (key_name == kServiceTypeAttrName) {
+      params.service_type =
+          GetGAIAServiceTypeFromHeader(header_dictionary[kServiceTypeAttrName]);
+    } else if (key_name == kEmailAttrName) {
+      params.email = header_dictionary[kEmailAttrName];
+    } else if (key_name == kIsSamlAttrName) {
+      params.is_saml = header_dictionary[kIsSamlAttrName] == "true";
+    } else if (key_name == kContinueUrlAttrName) {
+      params.continue_url = header_dictionary[kContinueUrlAttrName];
+    } else if (key_name == kIsSameTabAttrName) {
+      params.is_same_tab = header_dictionary[kIsSameTabAttrName] == "true";
+    } else {
+      DLOG(WARNING) << "Unexpected GAIA header attribute '" << key_name << "'.";
+    }
+  }
+  return params;
+}
+
 }  // namespace
 
 namespace signin {
 
+ManageAccountsParams::ManageAccountsParams()
+    : service_type(GAIA_SERVICE_TYPE_NONE),
+      email(""),
+      is_saml(false),
+      continue_url(""),
+      is_same_tab(false) {
+#if !defined(OS_IOS)
+  child_id = 0;
+  route_id = 0;
+#endif  // !defined(OS_IOS)
+}
+
 bool SettingsAllowSigninCookies(
     content_settings::CookieSettings* cookie_settings) {
   GURL gaia_url = GaiaUrls::GetInstance()->gaia_url();
@@ -89,4 +180,21 @@ bool AppendMirrorRequestHeaderIfPossible(
   return true;
 }
 
+ManageAccountsParams BuildManageAccountsParamsIfExists(net::URLRequest* request,
+                                                       bool is_off_the_record) {
+  ManageAccountsParams empty_params;
+  empty_params.service_type = GAIA_SERVICE_TYPE_NONE;
+  if (!gaia::IsGaiaSignonRealm(request->url().GetOrigin()))
+    return empty_params;
+
+  std::string header_value;
+  if (!request->response_headers()->GetNormalizedHeader(
+          kChromeManageAccountsHeader, &header_value)) {
+    return empty_params;
+  }
+
+  DCHECK(switches::IsEnableAccountConsistency() && !is_off_the_record);
+  return BuildManageAccountsParams(header_value);
+}
+
 }  // namespace signin
diff --git a/components/signin/core/browser/signin_header_helper.h b/components/signin/core/browser/signin_header_helper.h
index 404efaf..a03b20b 100644
--- a/components/signin/core/browser/signin_header_helper.h
+++ b/components/signin/core/browser/signin_header_helper.h
@@ -28,6 +28,44 @@ enum ProfileMode {
   PROFILE_MODE_ADD_ACCOUNT_DISABLED = 1 << 1
 };
 
+// The ServiceType specified by GAIA in the response header accompanying the 204
+// response. This indicates the action Chrome is supposed to lead the user to
+// perform.
+enum GAIAServiceType {
+  GAIA_SERVICE_TYPE_NONE = 0,    // No GAIA response header.
+  GAIA_SERVICE_TYPE_SIGNOUT,     // Logout all existing sessions.
+  GAIA_SERVICE_TYPE_INCOGNITO,   // Open an incognito tab.
+  GAIA_SERVICE_TYPE_ADDSESSION,  // Add a secondary account.
+  GAIA_SERVICE_TYPE_REAUTH,      // Re-authenticate an account.
+  GAIA_SERVICE_TYPE_SIGNUP,      // Create a new account.
+  GAIA_SERVICE_TYPE_DEFAULT,     // All other cases.
+};
+
+// Struct describing the paramters received in the manage account header.
+struct ManageAccountsParams {
+  // The requested service type such as "ADDSESSION".
+  GAIAServiceType service_type;
+  // The prefilled email.
+  std::string email;
+  // Whether |email| is a saml account.
+  bool is_saml;
+  // The continue URL after the requested service is completed successfully.
+  // Defaults to the current URL if empty.
+  std::string continue_url;
+  // Whether the continue URL should be loaded in the same tab.
+  bool is_same_tab;
+
+// iOS has no notion of route and child IDs.
+#if !defined(OS_IOS)
+  // The child id associated with the web content of the request.
+  int child_id;
+  // The route id associated with the web content of the request.
+  int route_id;
+#endif  // !defined(OS_IOS)
+
+  ManageAccountsParams();
+};
+
 // Returns true if signin cookies are allowed.
 bool SettingsAllowSigninCookies(
     content_settings::CookieSettings* cookie_settings);
@@ -42,6 +80,13 @@ bool AppendMirrorRequestHeaderIfPossible(
     content_settings::CookieSettings* cookie_settings,
     int profile_mode_mask);
 
+// Returns the parameters contained in the X-Chrome-Manage-Accounts response
+// header.
+// If the request does not have a response header or if the header contains
+// garbage, then |service_type| is set to |GAIA_SERVICE_TYPE_NONE|.
+ManageAccountsParams BuildManageAccountsParamsIfExists(net::URLRequest* request,
+                                                       bool is_off_the_record);
+
 }  // namespace signin
 
 #endif  // COMPONENTS_SIGNIN_CORE_BROWSER_SIGNIN_HEADER_HELPER_H_