mirror of
https://github.com/qpdf/qpdf.git
synced 2024-12-23 03:18:59 +00:00
641 lines
14 KiB
C++
641 lines
14 KiB
C++
#include <qpdf/QPDFJob.hh>
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#include <qpdf/JSONHandler.hh>
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#include <qpdf/QPDFUsage.hh>
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#include <qpdf/QUtil.hh>
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#include <qpdf/QTC.hh>
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#include <memory>
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#include <stdexcept>
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#include <sstream>
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#include <cstring>
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static JSON JOB_SCHEMA = JSON::parse(QPDFJob::job_json_schema_v1().c_str());
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namespace
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{
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class Handlers
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{
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public:
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Handlers(bool partial, std::shared_ptr<QPDFJob::Config> c_main);
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void handle(JSON&);
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private:
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# include <qpdf/auto_job_json_decl.hh>
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void usage(std::string const& message);
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void initHandlers();
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typedef std::function<void()> bare_handler_t;
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typedef std::function<void(char const*)> param_handler_t;
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typedef std::function<void(JSON)> json_handler_t;
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// The code that calls these methods is automatically
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// generated by generate_auto_job. This describes how we
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// implement what it does. We keep a stack of handlers in
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// json_handlers. The top of the stack is the "current" json
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// handler, intially for the top-level object. Whenever we
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// encounter a scalar, we add a handler using addBare,
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// addParameter, or addChoices. Whenever we encounter a
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// dictionary, we first add the dictionary handlers. Then we
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// walk into the dictionary and, for each key, we register a
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// dict key handler and push it to the stack, then do the same
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// process for the key's value. Then we pop the key handler
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// off the stack. When we encounter an array, we add the array
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// handlers, push an item handler to the stack, call
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// recursively for the array's single item (as this is what is
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// expected in a schema), and pop the item handler. Note that
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// we don't pop dictionary start/end handlers. The dictionary
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// handlers and the key handlers are at the same level in
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// JSONHandler. This logic is subtle and took several tries to
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// get right. It's best understood by carefully understanding
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// the behavior of JSONHandler, the JSON schema, and the code
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// in generate_auto_job.
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void addBare(bare_handler_t);
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void addParameter(param_handler_t);
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void addChoices(char const** choices, bool required, param_handler_t);
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void pushKey(std::string const& key);
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void beginDict(json_handler_t start_fn,
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bare_handler_t end_fn);
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void beginArray(json_handler_t start_fn,
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bare_handler_t end_fn);
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void ignoreItem();
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void popHandler();
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bare_handler_t bindBare(void (Handlers::*f)());
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json_handler_t bindJSON(void (Handlers::*f)(JSON));
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std::list<std::shared_ptr<JSONHandler>> json_handlers;
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bool partial;
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JSONHandler* jh; // points to last of json_handlers
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std::shared_ptr<QPDFJob::Config> c_main;
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std::shared_ptr<QPDFJob::CopyAttConfig> c_copy_att;
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std::shared_ptr<QPDFJob::AttConfig> c_att;
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std::shared_ptr<QPDFJob::PagesConfig> c_pages;
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std::shared_ptr<QPDFJob::UOConfig> c_uo;
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std::shared_ptr<QPDFJob::EncConfig> c_enc;
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};
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}
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Handlers::Handlers(bool partial, std::shared_ptr<QPDFJob::Config> c_main) :
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partial(partial),
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jh(nullptr),
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c_main(c_main)
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{
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initHandlers();
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}
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void
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Handlers::usage(std::string const& message)
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{
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throw QPDFUsage(message);
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}
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Handlers::bare_handler_t
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Handlers::bindBare(void (Handlers::*f)())
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{
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return std::bind(std::mem_fn(f), this);
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}
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Handlers::json_handler_t
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Handlers::bindJSON(void (Handlers::*f)(JSON))
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{
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return std::bind(std::mem_fn(f), this, std::placeholders::_1);
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}
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void
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Handlers::initHandlers()
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{
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this->json_handlers.push_back(std::make_shared<JSONHandler>());
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this->jh = this->json_handlers.back().get();
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jh->addDictHandlers(
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[](std::string const&, JSON){},
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[this](std::string const&){
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if (! this->partial)
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{
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c_main->checkConfiguration();
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}
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});
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# include <qpdf/auto_job_json_init.hh>
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if (this->json_handlers.size() != 1)
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{
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throw std::logic_error("QPDFJob_json: json_handlers size != 1 at end");
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}
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}
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void
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Handlers::addBare(bare_handler_t fn)
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{
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jh->addStringHandler(
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[this, fn](std::string const& path, std::string const& parameter){
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if (! parameter.empty())
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{
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QTC::TC("qpdf", "QPDFJob json bare not empty");
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usage(path + ": value must be the empty string");
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}
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else
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{
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fn();
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}
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});
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}
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void
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Handlers::addParameter(param_handler_t fn)
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{
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jh->addStringHandler(
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[fn](std::string const& path, std::string const& parameter){
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fn(parameter.c_str());
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});
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}
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void
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Handlers::addChoices(char const** choices, bool required, param_handler_t fn)
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{
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jh->addStringHandler(
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[fn, choices, required, this](
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std::string const& path, std::string const& parameter){
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char const* p = parameter.c_str();
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bool matches = false;
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if ((! required) && (parameter.empty()))
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{
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matches = true;
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}
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if (! matches)
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{
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for (char const** i = choices; *i; ++i)
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{
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if (strcmp(*i, p) == 0)
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{
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QTC::TC("qpdf", "QPDFJob json choice match");
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matches = true;
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break;
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}
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}
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}
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if (! matches)
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{
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QTC::TC("qpdf", "QPDFJob json choice mismatch");
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std::ostringstream msg;
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msg << path + ": unexpected value; expected one of ";
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bool first = true;
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for (char const** i = choices; *i; ++i)
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{
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if (first)
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{
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first = false;
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}
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else
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{
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msg << ", ";
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}
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msg << *i;
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}
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usage(msg.str());
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}
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fn(parameter.c_str());
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});
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}
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void
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Handlers::pushKey(std::string const& key)
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{
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auto new_jh = std::make_shared<JSONHandler>();
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this->jh->addDictKeyHandler(key, new_jh);
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this->json_handlers.push_back(new_jh);
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this->jh = new_jh.get();
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}
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void
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Handlers::beginDict(json_handler_t start_fn, bare_handler_t end_fn)
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{
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jh->addDictHandlers(
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[start_fn](std::string const&, JSON j){ start_fn(j); },
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[end_fn](std::string const&){ end_fn(); });
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}
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void
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Handlers::beginArray(json_handler_t start_fn, bare_handler_t end_fn)
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{
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auto item_jh = std::make_shared<JSONHandler>();
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jh->addArrayHandlers(
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[start_fn](std::string const&, JSON j){ start_fn(j); },
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[end_fn](std::string const&){ end_fn(); },
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item_jh);
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this->json_handlers.push_back(item_jh);
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this->jh = item_jh.get();
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}
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void
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Handlers::ignoreItem()
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{
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jh->addAnyHandler([](std::string const&, JSON){});
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}
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void
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Handlers::popHandler()
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{
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this->json_handlers.pop_back();
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this->jh = this->json_handlers.back().get();
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}
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void
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Handlers::handle(JSON& j)
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{
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this->json_handlers.back()->handle(".", j);
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}
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void
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Handlers::setupInputFile()
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{
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addParameter([this](char const* p) {
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c_main->inputFile(p);
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});
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}
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void
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Handlers::setupPassword()
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{
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addParameter([this](char const* p) {
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c_main->password(p);
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});
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}
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void
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Handlers::setupEmpty()
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{
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addBare([this]() {
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c_main->emptyInput();
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});
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}
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void
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Handlers::setupOutputFile()
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{
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addParameter([this](char const* p) {
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c_main->outputFile(p);
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});
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}
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void
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Handlers::setupReplaceInput()
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{
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addBare([this]() {
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c_main->replaceInput();
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});
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}
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void
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Handlers::beginEncrypt(JSON j)
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{
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// This method is only called if the overall JSON structure
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// matches the schema, so we already know that keys that are
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// present have the right types.
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int key_len = 0;
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std::string user_password;
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std::string owner_password;
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bool user_password_seen = false;
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bool owner_password_seen = false;
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j.forEachDictItem([&](std::string const& key, JSON value){
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if ((key == "40bit") || (key == "128bit") || (key == "256bit"))
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{
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if (key_len != 0)
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{
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QTC::TC("qpdf", "QPDFJob json encrypt duplicate key length");
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usage("exactly one of 40bit, 128bit, or 256bit must be given");
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}
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key_len = QUtil::string_to_int(key.c_str());
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}
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else if (key == "userPassword")
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{
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user_password_seen = value.getString(user_password);
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}
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else if (key == "ownerPassword")
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{
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owner_password_seen = value.getString(owner_password);
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}
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});
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if (key_len == 0)
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{
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QTC::TC("qpdf", "QPDFJob json encrypt no key length");
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usage("exactly one of 40bit, 128bit, or 256bit must be given;"
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" an empty dictionary may be supplied for one of them"
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" to set the key length without imposing any restrictions");
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}
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if (! (user_password_seen && owner_password_seen))
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{
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QTC::TC("qpdf", "QPDFJob json encrypt missing password");
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usage("the user and owner password are both required; use the empty"
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" string for the user password if you don't want a password");
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}
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this->c_enc = c_main->encrypt(key_len, user_password, owner_password);
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}
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void
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Handlers::endEncrypt()
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{
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this->c_enc->endEncrypt();
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this->c_enc = nullptr;
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}
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void
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Handlers::setupEncryptUserPassword()
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{
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// handled in beginEncrypt
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ignoreItem();
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}
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void
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Handlers::setupEncryptOwnerPassword()
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{
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// handled in beginEncrypt
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ignoreItem();
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}
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void
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Handlers::beginEncrypt40bit(JSON)
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{
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// nothing needed
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}
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void
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Handlers::endEncrypt40bit()
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{
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// nothing needed
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}
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void
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Handlers::beginEncrypt128bit(JSON)
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{
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// nothing needed
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}
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void
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Handlers::endEncrypt128bit()
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{
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// nothing needed
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}
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void
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Handlers::beginEncrypt256bit(JSON)
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{
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// nothing needed
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}
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void
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Handlers::endEncrypt256bit()
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{
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// nothing needed
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}
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void
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Handlers::beginJsonKeyArray(JSON)
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{
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// nothing needed
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}
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void
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Handlers::endJsonKeyArray()
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{
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// nothing needed
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}
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void
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Handlers::beginJsonObjectArray(JSON)
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{
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// nothing needed
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}
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void
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Handlers::endJsonObjectArray()
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{
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// nothing needed
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}
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void
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Handlers::beginAddAttachmentArray(JSON)
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{
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// nothing needed
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}
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void
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Handlers::endAddAttachmentArray()
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{
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// nothing needed
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}
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void
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Handlers::beginAddAttachment(JSON)
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{
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this->c_att = c_main->addAttachment();
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}
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void
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Handlers::endAddAttachment()
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{
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this->c_att->endAddAttachment();
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this->c_att = nullptr;
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}
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void
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Handlers::setupAddAttachmentFile()
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{
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addParameter([this](char const* p) {
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c_att->file(p);
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});
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}
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void
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Handlers::beginCopyAttachmentsFromArray(JSON)
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{
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// nothing needed
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}
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void
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Handlers::endCopyAttachmentsFromArray()
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{
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// nothing needed
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}
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void
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Handlers::beginCopyAttachmentsFrom(JSON)
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{
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this->c_copy_att = c_main->copyAttachmentsFrom();
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}
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void
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Handlers::endCopyAttachmentsFrom()
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{
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this->c_copy_att->endCopyAttachmentsFrom();
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this->c_copy_att = nullptr;
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}
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void
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Handlers::setupCopyAttachmentsFromFile()
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{
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addParameter([this](char const* p) {
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c_copy_att->file(p);
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});
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}
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void
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Handlers::setupCopyAttachmentsFromPassword()
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{
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addParameter([this](char const* p) {
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c_copy_att->password(p);
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});
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}
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void
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Handlers::beginPagesArray(JSON)
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{
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this->c_pages = c_main->pages();
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}
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void
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Handlers::endPagesArray()
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{
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c_pages->endPages();
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c_pages = nullptr;
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}
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void
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Handlers::beginPages(JSON j)
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{
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std::string file;
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std::string range("1-z");
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std::string password;
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bool file_seen = false;
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bool password_seen = false;
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j.forEachDictItem([&](std::string const& key, JSON value){
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if (key == "file")
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{
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file_seen = value.getString(file);
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}
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else if (key == "range")
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{
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value.getString(range);
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}
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else if (key == "password")
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{
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password_seen = value.getString(password);
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}
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});
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if (! file_seen)
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{
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QTC::TC("qpdf", "QPDFJob json pages no file");
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usage("file is required in page specification");
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}
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this->c_pages->pageSpec(
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file, range, password_seen ? password.c_str() : nullptr);
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}
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void
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Handlers::endPages()
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{
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// nothing needed
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}
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void
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Handlers::setupPagesFile()
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{
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// handled in beginPages
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ignoreItem();
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}
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void
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Handlers::setupPagesPassword()
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{
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// handled in beginPages
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ignoreItem();
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}
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void
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Handlers::setupPagesRange()
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{
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// handled in beginPages
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ignoreItem();
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}
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void
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Handlers::beginOverlay(JSON)
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{
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this->c_uo = c_main->overlay();
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}
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void
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Handlers::endOverlay()
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{
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c_uo->endUnderlayOverlay();
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c_uo = nullptr;
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}
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void
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Handlers::setupOverlayFile()
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{
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addParameter([this](char const* p) {
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c_uo->file(p);
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});
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}
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void
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Handlers::setupOverlayPassword()
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{
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addParameter([this](char const* p) {
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c_uo->password(p);
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});
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}
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void
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Handlers::beginUnderlay(JSON)
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{
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this->c_uo = c_main->underlay();
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}
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void
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Handlers::endUnderlay()
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{
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c_uo->endUnderlayOverlay();
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c_uo = nullptr;
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}
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void
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Handlers::setupUnderlayFile()
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{
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addParameter([this](char const* p) {
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c_uo->file(p);
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});
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}
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void
|
|
Handlers::setupUnderlayPassword()
|
|
{
|
|
addParameter([this](char const* p) {
|
|
c_uo->password(p);
|
|
});
|
|
}
|
|
|
|
void
|
|
QPDFJob::initializeFromJson(std::string const& json, bool partial)
|
|
{
|
|
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(partial, config()).handle(j);
|
|
}
|