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// 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 "chrome/browser/webshare/share_service_impl.h"
#include <algorithm>
#include <functional>
#include <utility>
#include "base/strings/string_util.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_commands.h"
#include "chrome/browser/ui/browser_list.h"
#include "chrome/browser/ui/browser_tabstrip.h"
#include "chrome/browser/ui/tabs/tab_strip_model.h"
#include "mojo/public/cpp/bindings/strong_binding.h"
#include "net/base/escape.h"
namespace {
// Determines whether a character is allowed in a URL template placeholder.
bool IsIdentifier(char c) {
return base::IsAsciiAlpha(c) || base::IsAsciiDigit(c) || c == '-' || c == '_';
}
// Joins a std::vector<base::StringPiece> into a single std::string.
// TODO(constantina): Implement a base::JoinString() that takes StringPieces.
// i.e. move this to base/strings/string_util.h, and thoroughly test.
std::string JoinString(const std::vector<base::StringPiece>& pieces) {
size_t total_size = 0;
for (const auto& piece : pieces) {
total_size += piece.size();
}
std::string joined_pieces;
joined_pieces.reserve(total_size);
for (const auto& piece : pieces) {
piece.AppendToString(&joined_pieces);
}
return joined_pieces;
}
} // namespace
// static
void ShareServiceImpl::Create(blink::mojom::ShareServiceRequest request) {
mojo::MakeStrongBinding(base::MakeUnique<ShareServiceImpl>(),
std::move(request));
}
// static
bool ShareServiceImpl::ReplacePlaceholders(base::StringPiece url_template,
base::StringPiece title,
base::StringPiece text,
const GURL& share_url,
std::string* url_template_filled) {
constexpr char kTitlePlaceholder[] = "title";
constexpr char kTextPlaceholder[] = "text";
constexpr char kUrlPlaceholder[] = "url";
std::map<base::StringPiece, std::string> placeholder_to_data;
placeholder_to_data[kTitlePlaceholder] =
net::EscapeQueryParamValue(title, false);
placeholder_to_data[kTextPlaceholder] =
net::EscapeQueryParamValue(text, false);
placeholder_to_data[kUrlPlaceholder] =
net::EscapeQueryParamValue(share_url.spec(), false);
std::vector<base::StringPiece> split_template;
bool last_saw_open = false;
size_t start_index_to_copy = 0;
for (size_t i = 0; i < url_template.size(); ++i) {
if (last_saw_open) {
if (url_template[i] == '}') {
base::StringPiece placeholder = url_template.substr(
start_index_to_copy + 1, i - 1 - start_index_to_copy);
auto it = placeholder_to_data.find(placeholder);
if (it != placeholder_to_data.end()) {
// Replace the placeholder text with the parameter value.
split_template.push_back(it->second);
}
last_saw_open = false;
start_index_to_copy = i + 1;
} else if (!IsIdentifier(url_template[i])) {
// Error: Non-identifier character seen after open.
return false;
}
} else {
if (url_template[i] == '}') {
// Error: Saw close, with no corresponding open.
return false;
} else if (url_template[i] == '{') {
split_template.push_back(
url_template.substr(start_index_to_copy, i - start_index_to_copy));
last_saw_open = true;
start_index_to_copy = i;
}
}
}
if (last_saw_open) {
// Error: Saw open that was never closed.
return false;
}
split_template.push_back(url_template.substr(
start_index_to_copy, url_template.size() - start_index_to_copy));
*url_template_filled = JoinString(split_template);
return true;
}
void ShareServiceImpl::OpenTargetURL(const GURL& target_url) {
// TODO(constantina): Prevent this code from being run/compiled in android.
#if defined(OS_LINUX) || defined(OS_WIN)
Browser* browser = BrowserList::GetInstance()->GetLastActive();
chrome::AddTabAt(browser, target_url,
browser->tab_strip_model()->active_index() + 1, true);
#endif
}
void ShareServiceImpl::Share(const std::string& title,
const std::string& text,
const GURL& share_url,
const ShareCallback& callback) {
// TODO(constantina): replace hard-coded URL with one from user-chosen site.
constexpr char kUrlBase[] = "https://wicg.github.io/web-share-target/";
constexpr char kUrlTemplate[] =
"demos/sharetarget.html?title={title}&text={text}&url={url}";
std::string url_template_filled;
if (!ReplacePlaceholders(kUrlTemplate, title, text, share_url,
&url_template_filled)) {
callback.Run(base::Optional<std::string>(
"Error: unable to replace placeholders in url template"));
return;
}
GURL target_url(kUrlBase + url_template_filled);
if (!target_url.is_valid()) {
callback.Run(base::Optional<std::string>(
"Error: url of share target is not a valid url."));
return;
}
OpenTargetURL(target_url);
callback.Run(base::nullopt);
}
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