Add card details and legal message to Android save credit card infobar.

components/autofill/core/browser/legal_message_line.cc

+// Copyright 2016 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/autofill/core/browser/legal_message_line.h"
+
+#include "base/i18n/message_formatter.h"
+#include "base/logging.h"
+#include "base/strings/string_util.h"
+#include "base/strings/utf_string_conversions.h"
+#include "base/values.h"
+
+namespace autofill {
+namespace {
+
+// 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 = base::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();
+}
+
+}  // namespace
+
+LegalMessageLine::Link::Link(size_t start,
+                             size_t end,
+                             const std::string& url_spec)
+    : range(start, end), url(url_spec) {}
+
+LegalMessageLine::Link::~Link() {}
+
+LegalMessageLine::LegalMessageLine() {}
+
+LegalMessageLine::~LegalMessageLine() {}
+
+// static
+bool LegalMessageLine::Parse(const base::DictionaryValue& legal_message,
+                             LegalMessageLines* out) {
+  const base::ListValue* lines_list = nullptr;
+  if (legal_message.GetList("line", &lines_list)) {
+    LegalMessageLines lines;
+    lines.reserve(lines_list->GetSize());
+    for (size_t i = 0; i < lines_list->GetSize(); ++i) {
+      lines.emplace_back(LegalMessageLine());
+      const base::DictionaryValue* single_line;
+      if (!lines_list->GetDictionary(i, &single_line) ||
+          !lines.back().ParseLine(*single_line))
+        return false;
+    }
+
+    out->swap(lines);
+  }
+
+  return true;
+}
+
+bool LegalMessageLine::ParseLine(const base::DictionaryValue& line) {
+  DCHECK(text_.empty());
+  DCHECK(links_.empty());
+
+  // |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.
+  const base::ListValue* template_parameters = nullptr;
+  if (line.GetList("template_parameter", &template_parameters)) {
+    display_texts.resize(template_parameters->GetSize());
+    links_.reserve(template_parameters->GetSize());
+
+    for (size_t parameter_index = 0;
+         parameter_index < template_parameters->GetSize(); ++parameter_index) {
+      const base::DictionaryValue* single_parameter;
+      std::string url;
+      if (!template_parameters->GetDictionary(parameter_index,
+                                              &single_parameter) ||
+          !single_parameter->GetString("display_text",
+                                       &display_texts[parameter_index]) ||
+          !single_parameter->GetString("url", &url))
+        return false;
+
+      links_.emplace_back(0, 0, url);
+    }
+  }
+
+  // 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|.
+  std::vector<size_t> offsets;
+  if (!ReplaceTemplatePlaceholders(template_icu, display_texts, &text_,
+                                   &offsets))
+    return false;
+
+  // Fill in range values for all links.
+  for (size_t offset_index = 0; offset_index < offsets.size(); ++offset_index) {
+    size_t range_start = offsets[offset_index];
+    links_[offset_index].range = gfx::Range(
+        range_start, range_start + display_texts[offset_index].size());
+  }
+
+  return true;
+}
+
+}  // namespace autofill