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// Copyright 2016 The Chromium Authors
// 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/payments/legal_message_line.h"
#include "base/check.h"
#include "base/i18n/message_formatter.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 std::u16string& template_icu,
const std::vector<std::u16string>& display_texts,
std::u16string* 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 "$$1" without doing the
// parameter replacement. This causes false to be returned because each
// parameter is not used exactly once.
//
// Both of these cases are noted in the header file, and are unlikely to
// occur in any actual legal message.
std::u16string template_icu_escaped;
base::ReplaceChars(template_icu, u"$", u"$$", &template_icu_escaped);
// Replace "{0}" -> "$1", "{1}" -> "$2", ... to prepare |template_dollars|
// for ReplaceStringPlaceholders().
std::u16string 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() = default;
bool LegalMessageLine::Link::operator==(
const LegalMessageLine::Link& other) const = default;
LegalMessageLine::LegalMessageLine() = default;
LegalMessageLine::LegalMessageLine(const LegalMessageLine& other) = default;
LegalMessageLine::~LegalMessageLine() = default;
bool LegalMessageLine::operator==(const LegalMessageLine& other) const =
default;
// static
bool LegalMessageLine::Parse(const base::Value::Dict& legal_message,
LegalMessageLines* out,
bool escape_apostrophes) {
const base::Value::List* lines_list = legal_message.FindList("line");
if (lines_list) {
LegalMessageLines lines;
lines.reserve(lines_list->size());
for (const base::Value& single_line : *lines_list) {
lines.emplace_back();
if (!single_line.is_dict() ||
!lines.back().ParseLine(single_line.GetDict(), escape_apostrophes)) {
return false;
}
}
out->swap(lines);
}
return true;
}
bool LegalMessageLine::ParseLine(const base::Value::Dict& line,
bool escape_apostrophes) {
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<std::u16string> display_texts;
// Process all the template parameters.
const base::Value::List* template_parameters =
line.FindList("template_parameter");
if (template_parameters) {
display_texts.reserve(template_parameters->size());
links_.reserve(template_parameters->size());
for (const base::Value& parameter : *template_parameters) {
if (!parameter.is_dict())
return false;
const std::string* display_text =
parameter.GetDict().FindString("display_text");
if (!display_text)
return false;
const std::string* url = parameter.GetDict().FindString("url");
if (!url)
return false;
display_texts.push_back(base::UTF8ToUTF16(*display_text));
links_.emplace_back(0, 0, *url);
}
}
// Read the template string. It's a small subset of the ICU message format
// syntax.
const std::string* template_icu_utf8 = line.FindString("template");
if (!template_icu_utf8)
return false;
std::u16string template_icu = base::UTF8ToUTF16(*template_icu_utf8);
if (escape_apostrophes) {
// The ICU standard counts "'{" as beginning an escaped string literal, even
// if there's no closing apostrophe. This fails legal message templates
// where an apostrophe precedes the template parameter, like "l'{1}" in
// Italian. Therefore, when |escape_apostrophes| is true, escape all
// apostrophes in the string by doubling them up.
// http://www.icu-project.org/apiref/icu4c/messagepattern_8h.html#af6e0757e0eb81c980b01ee5d68a9978b
base::ReplaceChars(template_icu, u"'", u"''", &template_icu);
}
// 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
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