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// Copyright 2020 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/shared_highlighting/core/common/fragment_directives_utils.h"
#include <string.h>
#include <algorithm>
#include <optional>
#include <sstream>
#include <string_view>
#include "base/json/json_writer.h"
#include "base/strings/escape.h"
#include "base/strings/strcat.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "components/shared_highlighting/core/common/fragment_directives_constants.h"
#include "components/shared_highlighting/core/common/text_fragment.h"
namespace shared_highlighting {
base::Value ParseTextFragments(const GURL& url) {
if (!url.has_ref())
return {};
std::vector<std::string> fragments = ExtractTextFragments(url.ref());
if (fragments.empty())
return {};
base::Value::List parsed;
for (const std::string& fragment : fragments) {
std::optional<TextFragment> opt_frag =
TextFragment::FromEscapedString(fragment);
if (opt_frag.has_value()) {
parsed.Append(opt_frag->ToValue());
}
}
return base::Value(std::move(parsed));
}
bool SplitUrlTextFragmentDirective(const std::string& full_url,
GURL* webpage_url,
std::string* highlight_directive) {
if (webpage_url == nullptr || highlight_directive == nullptr) {
return false;
}
std::size_t pos = full_url.find(kFragmentsUrlDelimiter);
if (pos == std::string::npos) {
return false;
}
// The fragment directive will be preceded by either '#' if it's the first
// anchor element or '&' otherwise. In both cases we want to remove it from
// the url.
*webpage_url = GURL(full_url.substr(0, pos - 1));
// We only want to keep what's after the delimiter.
*highlight_directive = full_url.substr(pos + kFragmentsUrlDelimiterLength +
kTextDirectiveParameterNameLength);
return true;
}
std::vector<std::string> ExtractTextFragments(std::string ref_string) {
size_t start_pos = ref_string.find(kFragmentsUrlDelimiter);
if (start_pos == std::string::npos)
return {};
ref_string.erase(0, start_pos + kFragmentsUrlDelimiterLength);
std::vector<std::string> fragment_strings;
while (ref_string.size()) {
// Consume everything up to and including the text= prefix
size_t prefix_pos = ref_string.find(kTextDirectiveParameterName);
if (prefix_pos == std::string::npos)
break;
ref_string.erase(0, prefix_pos + kTextDirectiveParameterNameLength);
// A & indicates the end of the fragment (and the start of the next).
// Save everything up to this point, and then consume it (including the &).
size_t ampersand_pos = ref_string.find(kSelectorJoinDelimeter);
if (ampersand_pos != 0)
fragment_strings.push_back(ref_string.substr(0, ampersand_pos));
if (ampersand_pos == std::string::npos)
break;
ref_string.erase(0, ampersand_pos + 1);
}
return fragment_strings;
}
GURL RemoveFragmentSelectorDirectives(const GURL& url) {
const std::vector<std::string_view> directive_parameter_names{
kTextDirectiveParameterName, kSelectorDirectiveParameterName};
size_t start_pos = url.ref().find(kFragmentsUrlDelimiter);
if (start_pos == std::string::npos)
return url;
// Split url before and after the ":~:" delimiter.
std::string fragment_prefix = url.ref().substr(0, start_pos);
std::string fragment_directive =
url.ref().substr(start_pos + kFragmentsUrlDelimiterLength);
// Split fragment directive on "&" and remove any piece that starts with
// one of the directive_parameter_names
std::vector<std::string> should_keep_directives;
for (const std::string& directive :
base::SplitString(fragment_directive, kSelectorJoinDelimeter,
base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL)) {
if (std::ranges::none_of(
directive_parameter_names,
[&directive](std::string_view directive_parameter_name) {
return base::StartsWith(directive, directive_parameter_name);
})) {
should_keep_directives.push_back(directive);
}
}
// Join remaining pieces and append to the url.
std::string new_fragment =
should_keep_directives.empty()
? fragment_prefix
: base::StrCat({fragment_prefix, kFragmentsUrlDelimiter,
base::JoinString(should_keep_directives,
kSelectorJoinDelimeter)});
GURL::Replacements replacements;
if (new_fragment.empty())
replacements.ClearRef();
else
replacements.SetRefStr(new_fragment);
return url.ReplaceComponents(replacements);
}
GURL AppendFragmentDirectives(const GURL& base_url,
std::vector<TextFragment> fragments) {
if (!base_url.is_valid()) {
return GURL();
}
std::vector<std::string> fragment_strings;
for (auto it = std::begin(fragments); it != std::end(fragments); ++it) {
std::string fragment_string = (*it).ToEscapedString();
if (!fragment_string.empty()) {
fragment_strings.push_back(fragment_string);
}
}
return AppendFragmentDirectives(base_url, fragment_strings);
}
GURL AppendSelectors(const GURL& base_url, std::vector<std::string> selectors) {
if (!base_url.is_valid()) {
return GURL();
}
std::vector<std::string> fragment_strings;
for (std::string& selector : selectors) {
if (!selector.empty()) {
fragment_strings.push_back(kTextDirectiveParameterName + selector);
}
}
return AppendFragmentDirectives(base_url, fragment_strings);
}
GURL AppendFragmentDirectives(const GURL& base_url,
std::vector<std::string> directives) {
std::string fragments_string =
base::JoinString(directives, kSelectorJoinDelimeter);
if (fragments_string.empty()) {
return base_url;
}
GURL url = RemoveFragmentSelectorDirectives(base_url);
std::string new_ref = url.ref();
if (new_ref.find(kFragmentsUrlDelimiter) == std::string::npos) {
new_ref += kFragmentsUrlDelimiter;
} else {
new_ref += kSelectorJoinDelimeter;
}
new_ref += fragments_string;
GURL::Replacements replacements;
replacements.SetRefStr(new_ref);
return url.ReplaceComponents(replacements);
}
} // namespace shared_highlighting
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