Autofill: Add legal message footer to save credit card bubble.

chrome/browser/ui/autofill/save_card_bubble_controller_impl.cc

Index: chrome/browser/ui/autofill/save_card_bubble_controller_impl.cc
diff --git a/chrome/browser/ui/autofill/save_card_bubble_controller_impl.cc b/chrome/browser/ui/autofill/save_card_bubble_controller_impl.cc
index 2e43699e3f435ffe870588f220a00da460322e94..627464a0946452c5e72b5fbdb051126de8ba00fe 100644
--- a/chrome/browser/ui/autofill/save_card_bubble_controller_impl.cc
+++ b/chrome/browser/ui/autofill/save_card_bubble_controller_impl.cc
@@ -4,6 +4,9 @@
 
 #include "chrome/browser/ui/autofill/save_card_bubble_controller_impl.h"
 
+#include "base/i18n/message_formatter.h"
+#include "base/strings/string_util.h"
+#include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/ui/autofill/save_card_bubble_view.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_finder.h"
@@ -21,6 +24,116 @@ namespace {
 // TODO(bondd): Share with ManagePasswordsUIController.
 const int kSurviveNavigationSeconds = 5;
 
+// Replace "{0}", "{1}", ... in |template_icu| with corresponding strings
+// from |display_texts|. Sets |out_message| to the resulting string, with
+// start position of each replacement in |out_offsets|.
+// Return false on failure. If false is returned then contents of |out_message|
+// and |out_offsets| are undefined.
+bool ReplaceTemplatePlaceholders(
+    const base::string16& template_icu,
+    const std::vector<base::string16>& display_texts,
+    base::string16& out_message,
+    std::vector<size_t>& out_offsets) {
+  // Escape "$" -> "$$" for ReplaceStringPlaceholders().
+  //
+  // Edge cases:
+  // 1. Two or more consecutive $ characters will be incorrectly expanded
+  //    ("$$" -> "$$$$", which ReplaceStringPlaceholders() then turns into
+  //    "$$$").
+  //
+  // 2. "${" will cause false to be returned. "${0}" will expand to "$${0}".
+  //    FormatWithNumberedArgs() turns it into "$$$1", which
+  //    ReplaceStringPlaceholders() then turns into "$$1" without doing the
+  //    parameter replacement. This causes false to be returned because each
+  //    parameter is not used exactly once.
+  //
+  // Both of these cases are noted in the header file, and are unlikely to
+  // occur in any actual legal message.
+  base::string16 template_icu_escaped;
+  base::ReplaceChars(template_icu, base::ASCIIToUTF16("$"),
+                     base::ASCIIToUTF16("$$"), &template_icu_escaped);
+
+  // Replace "{0}" -> "$1", "{1}" -> "$2", ... to prepare |template_dollars|
+  // for ReplaceStringPlaceholders().
+  base::string16 template_dollars =
+      base::i18n::MessageFormatter::FormatWithNumberedArgs(
+          template_icu_escaped, "$1", "$2", "$3", "$4", "$5", "$6", "$7");
+
+  // FormatWithNumberedArgs() returns an empty string on failure.
+  if (template_dollars.empty() && !template_icu.empty())
+    return false;
+
+  // Replace "$1", "$2", ... with the display text of each parameter.
+  out_message =
+      ReplaceStringPlaceholders(template_dollars, display_texts, &out_offsets);
+
+  // Each parameter must be used exactly once. If a parameter is unused or
+  // used more than once then it can't be determined which |offsets| entry
+  // corresponds to which parameter.
+  return out_offsets.size() == display_texts.size();
+}
+
+// Parses |line| and appends results to |message|, |link_ranges|, and
+// |link_urls|.
+// Returns false on failure. If false is returned then contents of output
+// variables are undefined.
+bool ParseAndAppendToLegalMessage(const base::DictionaryValue& line,
+                                  base::string16* message,
+                                  std::vector<gfx::Range>* link_ranges,
+                                  std::vector<std::string>* link_urls) {
+  // |display_texts| elements are the strings that will be substituted for
+  // "{0}", "{1}", etc. in the template string.
+  std::vector<base::string16> display_texts;
+
+  // Process all the template parameters for the current message line.
+  const base::ListValue* template_parameters = nullptr;
+  if (line.GetList("template_parameter", &template_parameters)) {
+    for (size_t parameter_index = 0;
+         parameter_index < template_parameters->GetSize(); ++parameter_index) {
+      // Get a single element of the "template_parameter" list.
+      const base::DictionaryValue* single_parameter;
+      if (!template_parameters->GetDictionary(parameter_index,
+                                              &single_parameter))
+        return false;
+
+      // Read and store the "display_text" string.
+      display_texts.push_back(base::string16());
+      if (!single_parameter->GetString("display_text", &display_texts.back()))
+        return false;
+
+      // Read and store the "url" string.
+      link_urls->push_back(std::string());
+      if (!single_parameter->GetString("url", &link_urls->back()))
+        return false;
+    }
+  }
+
+  // Read the template string. It's a small subset of the ICU message format
+  // syntax.
+  base::string16 template_icu;
+  if (!line.GetString("template", &template_icu))
+    return false;
+
+  // Replace the placeholders in |template_icu| with strings from
+  // |display_texts|, and store the start position of each replacement in
+  // |offsets|.
+  base::string16 message_line;
+  std::vector<size_t> offsets;
+  if (!ReplaceTemplatePlaceholders(template_icu, display_texts, message_line,
+                                   offsets))
+    return false;
+
+  // Fill in range values for all links in this line.
+  for (size_t offset_index = 0; offset_index < offsets.size(); ++offset_index) {
+    size_t range_start = message->size() + offsets[offset_index];
+    link_ranges->push_back(gfx::Range(
+        range_start, range_start + display_texts[offset_index].size()));
+  }
+
+  message->append(message_line);
+  return true;
+}
+
 }  // namespace
 
 namespace autofill {
@@ -42,6 +155,41 @@ void SaveCardBubbleControllerImpl::SetCallback(
   save_card_callback_ = save_card_callback;
 }
 
+bool SaveCardBubbleControllerImpl::SetLegalMessage(
+    const base::ListValue& lines) {
+  ClearLegalMessage();
+  base::string16 message;
+  std::vector<gfx::Range> link_ranges;
+  std::vector<std::string> link_urls;
+
+  // Process all lines of the message. See comment in header file for example
+  // of valid |lines| data.
+  for (size_t line_index = 0; line_index < lines.GetSize(); ++line_index) {
+    const base::DictionaryValue* single_line;
+    if (!lines.GetDictionary(line_index, &single_line))
+      return false;
+
+    if (!ParseAndAppendToLegalMessage(*single_line, &message, &link_ranges,
+                                      &link_urls))
+      return false;
+
+    // If this is not the last line of the message then append a newline.
+    if (line_index + 1 < lines.GetSize())
+      message.push_back('\n');
+  }
+
+  legal_message_ = message;
+  legal_message_link_ranges_ = link_ranges;
+  legal_message_link_urls_ = link_urls;
+  return true;
+}
+
+void SaveCardBubbleControllerImpl::ClearLegalMessage() {
+  legal_message_.clear();
+  legal_message_link_ranges_.clear();
+  legal_message_link_urls_.clear();
+}
+
 void SaveCardBubbleControllerImpl::ShowBubble() {
   DCHECK(!save_card_callback_.is_null());
 
@@ -84,9 +232,19 @@ void SaveCardBubbleControllerImpl::OnCancelButton() {
 }
 
 void SaveCardBubbleControllerImpl::OnLearnMoreClicked() {
-  web_contents()->OpenURL(content::OpenURLParams(
-      GURL(kHelpURL), content::Referrer(), NEW_FOREGROUND_TAB,
-      ui::PAGE_TRANSITION_LINK, false));
+  OpenUrl(kHelpURL);
+}
+
+void SaveCardBubbleControllerImpl::OnLegalMessageLinkClicked(
+    const gfx::Range& link_range) {
+  for (size_t i = 0; i < legal_message_link_ranges_.size(); ++i) {
+    if (legal_message_link_ranges_[i] == link_range) {
+      OpenUrl(legal_message_link_urls_[i]);
+      return;
+    }
+  }
+  // link_range was not found.
+  NOTREACHED();
 }
 
 void SaveCardBubbleControllerImpl::OnBubbleClosed() {
@@ -94,12 +252,32 @@ void SaveCardBubbleControllerImpl::OnBubbleClosed() {
   UpdateIcon();
 }
 
+const base::string16& SaveCardBubbleControllerImpl::GetLegalMessage() const {
+  return legal_message_;
+}
+
+const std::vector<gfx::Range>&
+SaveCardBubbleControllerImpl::GetLegalMessageLinkRanges() const {
+  return legal_message_link_ranges_;
+}
+
+const std::vector<std::string>&
+SaveCardBubbleControllerImpl::GetLegalMessageLinkUrlsForTesting() const {
+  return legal_message_link_urls_;
+}
+
 void SaveCardBubbleControllerImpl::UpdateIcon() {
   Browser* browser = chrome::FindBrowserWithWebContents(web_contents());
   LocationBar* location_bar = browser->window()->GetLocationBar();
   location_bar->UpdateSaveCreditCardIcon();
 }
 
+void SaveCardBubbleControllerImpl::OpenUrl(const std::string& url) {
+  web_contents()->OpenURL(
+      content::OpenURLParams(GURL(url), content::Referrer(), NEW_FOREGROUND_TAB,
+                             ui::PAGE_TRANSITION_LINK, false));
+}
+
 void SaveCardBubbleControllerImpl::DidNavigateMainFrame(
     const content::LoadCommittedDetails& details,
     const content::FrameNavigateParams& params) {