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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "generic_state_handler.h"
#include <vespa/vespalib/data/slime/slime.h>
#include <vespa/vespalib/data/simple_buffer.h>
namespace vespalib {
namespace {
// escape a path component in the URL
// (needed to avoid java.net.URI throwing an exception)
vespalib::string url_escape(const vespalib::string &item) {
static const char hexdigits[] = "0123456789ABCDEF";
vespalib::string r;
r.reserve(item.size());
for (const char c : item) {
if ( ('a' <= c && c <= 'z')
|| ('0' <= c && c <= '9')
|| ('A' <= c && c <= 'Z')
|| (c == '_')
|| (c == '-'))
{
r.append(c);
} else {
r.append('%');
r.append(hexdigits[0xF & (c >> 4)]);
r.append(hexdigits[0xF & c]);
}
}
return r;
}
class Url {
private:
vespalib::string _url;
void append(const vespalib::string &item) {
if (*_url.rbegin() != '/') {
_url.append('/');
}
_url.append(url_escape(item));
}
public:
Url(const vespalib::string &host, const std::vector<vespalib::string> &items)
: _url("http://")
{
_url.append(host);
_url.append('/');
for (const auto &item: items) {
append(item);
}
}
Url(const Url &parent, const vespalib::string &item)
: _url(parent._url)
{
append(item);
}
const vespalib::string &get() const { return _url; }
};
std::vector<vespalib::string> split_path(const vespalib::string &path) {
vespalib::string tmp;
std::vector<vespalib::string> items;
for (size_t i = 0; (i < path.size()) && (path[i] != '?'); ++i) {
if (path[i] == '/') {
if (!tmp.empty()) {
items.push_back(tmp);
tmp.clear();
}
} else {
tmp.push_back(path[i]);
}
}
if (!tmp.empty()) {
items.push_back(tmp);
}
return items;
}
bool is_prefix(const std::vector<vespalib::string> &root, const std::vector<vespalib::string> &full) {
if (root.size() > full.size()) {
return false;
}
for (size_t i = 0; i < root.size(); ++i) {
if (root[i] != full[i]) {
return false;
}
}
return true;
}
void inject_children(const StateExplorer &state, const Url &url, slime::Cursor &self);
Slime child_state(const StateExplorer &state, const Url &url) {
Slime child_state;
state.get_state(slime::SlimeInserter(child_state), false);
if (child_state.get().type().getId() == slime::NIX::ID) {
inject_children(state, url, child_state.setObject());
} else {
child_state.get().setString("url", url.get());
}
return child_state;
}
void inject_children(const StateExplorer &state, const Url &url, slime::Cursor &self) {
std::vector<vespalib::string> children_names = state.get_children_names();
for (const vespalib::string &child_name: children_names) {
std::unique_ptr<StateExplorer> child = state.get_child(child_name);
if (child) {
Slime fragment = child_state(*child, Url(url, child_name));
slime::inject(fragment.get(), slime::ObjectInserter(self, child_name));
}
}
}
vespalib::string render(const StateExplorer &state, const Url &url) {
Slime top;
state.get_state(slime::SlimeInserter(top), true);
if (top.get().type().getId() == slime::NIX::ID) {
top.setObject();
}
inject_children(state, url, top.get());
SimpleBuffer buf;
slime::JsonFormat::encode(top, buf, true);
return buf.get().make_string();
}
JsonGetHandler::Response explore(const StateExplorer &state, const vespalib::string &host,
const std::vector<vespalib::string> &items, size_t pos) {
if (pos == items.size()) {
return JsonGetHandler::Response::make_ok_with_json(render(state, Url(host, items)));
}
std::unique_ptr<StateExplorer> child = state.get_child(items[pos]);
if (!child) {
return JsonGetHandler::Response::make_not_found();
}
return explore(*child, host, items, pos + 1);
}
} // namespace vespalib::<unnamed>
GenericStateHandler::GenericStateHandler(const vespalib::string &root_path, const StateExplorer &state)
: _root(split_path(root_path)),
_state(state)
{
}
JsonGetHandler::Response
GenericStateHandler::get(const vespalib::string &host,
const vespalib::string &path,
const std::map<vespalib::string,vespalib::string> &,
const net::ConnectionAuthContext &) const
{
std::vector<vespalib::string> items = split_path(path);
if (!is_prefix(_root, items)) {
return Response::make_not_found();
}
return explore(_state, host, items, _root.size());
}
} // namespace vespalib
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