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qpdf/libqpdf/QPDFJob_json.cc
2022-01-31 15:57:45 -05:00

564 lines
12 KiB
C++

#include <qpdf/QPDFJob.hh>
#include <qpdf/JSONHandler.hh>
#include <qpdf/QPDFUsage.hh>
#include <qpdf/QUtil.hh>
#include <memory>
#include <stdexcept>
#include <sstream>
#include <cstring>
static JSON JOB_SCHEMA = JSON::parse(QPDFJob::json_job_schema_v1().c_str());
namespace
{
class Handlers
{
public:
Handlers(std::shared_ptr<QPDFJob::Config> c_main);
void handle(JSON&);
private:
# include <qpdf/auto_job_json_decl.hh>
void usage(std::string const& message);
void initHandlers();
typedef std::function<void()> bare_handler_t;
typedef std::function<void(char const*)> param_handler_t;
typedef std::function<void(JSON)> json_handler_t;
typedef std::function<void(std::string const& key)> setup_handler_t;
void addBare(std::string const& key, bare_handler_t);
void addParameter(std::string const& key, param_handler_t);
void addChoices(std::string const& key, char const** choices,
param_handler_t);
void doSetup(std::string const& key, setup_handler_t);
void beginDict(std::string const& key,
json_handler_t start_fn,
bare_handler_t end_fn);
void endDict();
bare_handler_t bindBare(void (Handlers::*f)());
json_handler_t bindJSON(void (Handlers::*f)(JSON));
setup_handler_t bindSetup(void (Handlers::*f)(std::string const&));
std::list<std::shared_ptr<JSONHandler>> json_handlers;
JSONHandler* jh; // points to last of json_handlers
std::shared_ptr<QPDFJob::Config> c_main;
std::shared_ptr<QPDFJob::CopyAttConfig> c_copy_att;
std::shared_ptr<QPDFJob::AttConfig> c_att;
std::shared_ptr<QPDFJob::PagesConfig> c_pages;
std::shared_ptr<QPDFJob::UOConfig> c_uo;
std::shared_ptr<QPDFJob::EncConfig> c_enc;
};
}
Handlers::Handlers(std::shared_ptr<QPDFJob::Config> c_main) :
jh(nullptr),
c_main(c_main)
{
initHandlers();
}
void
Handlers::usage(std::string const& message)
{
throw QPDFUsage(message);
}
Handlers::bare_handler_t
Handlers::bindBare(void (Handlers::*f)())
{
return std::bind(std::mem_fn(f), this);
}
Handlers::json_handler_t
Handlers::bindJSON(void (Handlers::*f)(JSON))
{
return std::bind(std::mem_fn(f), this, std::placeholders::_1);
}
Handlers::setup_handler_t
Handlers::bindSetup(void (Handlers::*f)(std::string const&))
{
return std::bind(std::mem_fn(f), this, std::placeholders::_1);
}
void
Handlers::initHandlers()
{
this->json_handlers.push_back(std::make_shared<JSONHandler>());
this->jh = this->json_handlers.back().get();
jh->addDictHandlers(
[](std::string const&, JSON){},
[this](std::string const&){c_main->checkConfiguration();});
# include <qpdf/auto_job_json_init.hh>
if (this->json_handlers.size() != 1)
{
throw std::logic_error("QPDFJob_json: json_handlers size != 1 at end");
}
}
void
Handlers::addBare(std::string const& key, bare_handler_t fn)
{
auto h = std::make_shared<JSONHandler>();
h->addBoolHandler([this, fn](std::string const& path, bool v){
if (! v)
{
usage(path + ": value must be true");
}
else
{
fn();
}
});
jh->addDictKeyHandler(key, h);
}
void
Handlers::addParameter(std::string const& key, param_handler_t fn)
{
auto h = std::make_shared<JSONHandler>();
h->addStringHandler(
[fn](std::string const& path, std::string const& parameter){
fn(parameter.c_str());
});
jh->addDictKeyHandler(key, h);
}
void
Handlers::addChoices(std::string const& key, char const** choices,
param_handler_t fn)
{
auto h = std::make_shared<JSONHandler>();
h->addStringHandler(
[fn, choices, this](
std::string const& path, std::string const& parameter){
char const* p = parameter.c_str();
bool matches = false;
for (char const** i = choices; *i; ++i)
{
if (strcmp(*i, p) == 0)
{
matches = true;
break;
}
}
if (! matches)
{
std::ostringstream msg;
msg << path + ": unexpected value; expected one of ";
bool first = true;
for (char const** i = choices; *i; ++i)
{
if (first)
{
first = false;
}
else
{
msg << ", ";
}
msg << *i;
}
usage(msg.str());
}
fn(parameter.c_str());
});
jh->addDictKeyHandler(key, h);
}
void
Handlers::doSetup(std::string const& key, setup_handler_t fn)
{
fn(key);
}
void
Handlers::beginDict(std::string const& key,
json_handler_t start_fn,
bare_handler_t end_fn)
{
auto new_jh = std::make_shared<JSONHandler>();
new_jh->addDictHandlers(
[start_fn](std::string const&, JSON j){ start_fn(j); },
[end_fn](std::string const&){ end_fn(); });
this->jh->addDictKeyHandler(key, new_jh);
this->json_handlers.push_back(new_jh);
this->jh = new_jh.get();
}
void
Handlers::endDict()
{
this->json_handlers.pop_back();
this->jh = this->json_handlers.back().get();
}
void
Handlers::handle(JSON& j)
{
this->json_handlers.back()->handle(".", j);
}
void
Handlers::beginInput(JSON)
{
// nothing needed
}
void
Handlers::endInput()
{
// nothing needed
}
void
Handlers::setupInputFilename(std::string const& key)
{
addParameter(key, [this](char const* p) {
c_main->inputFile(p);
});
}
void
Handlers::setupInputPassword(std::string const& key)
{
addParameter(key, [this](char const* p) {
c_main->password(p);
});
}
void
Handlers::setupInputEmpty(std::string const& key)
{
addBare(key, [this]() {
c_main->emptyInput();
});
}
void
Handlers::beginOutput(JSON)
{
// nothing needed
}
void
Handlers::endOutput()
{
// nothing needed
}
void
Handlers::setupOutputFilename(std::string const& key)
{
addParameter(key, [this](char const* p) {
c_main->outputFile(p);
});
}
void
Handlers::setupOutputReplaceInput(std::string const& key)
{
addBare(key, [this]() {
c_main->replaceInput();
});
}
void
Handlers::beginOutputOptions(JSON)
{
// nothing needed
}
void
Handlers::endOutputOptions()
{
// nothing needed
}
void
Handlers::beginOutputOptionsEncrypt(JSON j)
{
// This method is only called if the overall JSON structure
// matches the schema, so we already know that keys that are
// present have the right types.
int key_len = 0;
std::string user_password;
std::string owner_password;
bool user_password_seen = false;
bool owner_password_seen = false;
j.forEachDictItem([&](std::string const& key, JSON value){
if ((key == "40bit") || (key == "128bit") || (key == "256bit"))
{
if (key_len != 0)
{
usage("exactly one of 40bit, 128bit, or 256bit must be given");
}
key_len = QUtil::string_to_int(key.c_str());
}
else if (key == "userPassword")
{
user_password_seen = value.getString(user_password);
}
else if (key == "ownerPassword")
{
owner_password_seen = value.getString(owner_password);
}
});
if (key_len == 0)
{
usage("exactly one of 40bit, 128bit, or 256bit must be given;"
" an empty dictionary may be supplied for one of them"
" to set the key length without imposing any restrictions");
}
if (! (user_password_seen && owner_password_seen))
{
usage("the user and owner password are both required; use the empty"
" string for the user password if you don't want a password");
}
this->c_enc = c_main->encrypt(key_len, user_password, owner_password);
}
void
Handlers::endOutputOptionsEncrypt()
{
this->c_enc->endEncrypt();
this->c_enc = nullptr;
}
void
Handlers::setupOutputOptionsEncryptUserPassword(std::string const& key)
{
// Key handled in beginOutputOptionsEncrypt
}
void
Handlers::setupOutputOptionsEncryptOwnerPassword(std::string const& key)
{
// Key handled in beginOutputOptionsEncrypt
}
void
Handlers::beginOutputOptionsEncrypt40bit(JSON)
{
// nothing needed
}
void
Handlers::endOutputOptionsEncrypt40bit()
{
// nothing needed
}
void
Handlers::beginOutputOptionsEncrypt128bit(JSON)
{
// nothing needed
}
void
Handlers::endOutputOptionsEncrypt128bit()
{
// nothing needed
}
void
Handlers::beginOutputOptionsEncrypt256bit(JSON)
{
// nothing needed
}
void
Handlers::endOutputOptionsEncrypt256bit()
{
// nothing needed
}
void
Handlers::beginOptions(JSON)
{
// nothing needed
}
void
Handlers::endOptions()
{
// nothing needed
}
void
Handlers::beginInspect(JSON)
{
// nothing needed
}
void
Handlers::endInspect()
{
// nothing needed
}
void
Handlers::beginOptionsAddAttachment(JSON)
{
this->c_att = c_main->addAttachment();
}
void
Handlers::endOptionsAddAttachment()
{
this->c_att->endAddAttachment();
this->c_att = nullptr;
}
void
Handlers::setupOptionsAddAttachmentPath(std::string const& key)
{
addParameter(key, [this](char const* p) {
c_att->path(p);
});
}
void
Handlers::beginOptionsCopyAttachmentsFrom(JSON)
{
this->c_copy_att = c_main->copyAttachmentsFrom();
}
void
Handlers::endOptionsCopyAttachmentsFrom()
{
this->c_copy_att->endCopyAttachmentsFrom();
this->c_copy_att = nullptr;
}
void
Handlers::setupOptionsCopyAttachmentsFromPath(std::string const& key)
{
addParameter(key, [this](char const* p) {
c_copy_att->path(p);
});
}
void
Handlers::setupOptionsCopyAttachmentsFromPassword(std::string const& key)
{
addParameter(key, [this](char const* p) {
c_copy_att->password(p);
});
}
void
Handlers::beginOptionsPages(JSON)
{
// QXXXQ
}
void
Handlers::endOptionsPages()
{
// QXXXQ
}
void
Handlers::setupOptionsPagesFile(std::string const& key)
{
// handled in beginOptionsPages
}
void
Handlers::setupOptionsPagesPassword(std::string const& key)
{
// handled in beginOptionsPages
}
void
Handlers::setupOptionsPagesRange(std::string const& key)
{
// handled in beginOptionsPages
}
void
Handlers::beginOptionsOverlay(JSON)
{
this->c_uo = c_main->overlay();
}
void
Handlers::endOptionsOverlay()
{
c_uo->endUnderlayOverlay();
c_uo = nullptr;
}
void
Handlers::setupOptionsOverlayFile(std::string const& key)
{
addParameter(key, [this](char const* p) {
c_uo->path(p);
});
}
void
Handlers::setupOptionsOverlayPassword(std::string const& key)
{
addParameter(key, [this](char const* p) {
c_uo->password(p);
});
}
void
Handlers::beginOptionsUnderlay(JSON)
{
this->c_uo = c_main->underlay();
}
void
Handlers::endOptionsUnderlay()
{
c_uo->endUnderlayOverlay();
c_uo = nullptr;
}
void
Handlers::setupOptionsUnderlayFile(std::string const& key)
{
addParameter(key, [this](char const* p) {
c_uo->path(p);
});
}
void
Handlers::setupOptionsUnderlayPassword(std::string const& key)
{
addParameter(key, [this](char const* p) {
c_uo->password(p);
});
}
void
QPDFJob::initializeFromJson(std::string const& json)
{
std::list<std::string> errors;
JSON j = JSON::parse(json);
if (! j.checkSchema(JOB_SCHEMA, JSON::f_optional, errors))
{
std::ostringstream msg;
msg << this->m->message_prefix
<< ": job json has errors:";
for (auto const& error: errors)
{
msg << std::endl << " " << error;
}
throw std::runtime_error(msg.str());
}
Handlers(config()).handle(j);
}