OpenSystemsDevelopment / qpdf

// Copyright (c) 2005-2023 Jay Berkenbilt
//
// This file is part of qpdf.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
// in compliance with the License. You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software distributed under the License
// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
// or implied. See the License for the specific language governing permissions and limitations under
// the License.
//
// Versions of qpdf prior to version 7 were released under the terms of version 2.0 of the Artistic
// License. At your option, you may continue to consider qpdf to be licensed under those terms.
// Please see the manual for additional information.

#ifndef QPDFJOB_HH
#define QPDFJOB_HH

#include <qpdf/Constants.h>
#include <qpdf/DLL.h>
#include <qpdf/PDFVersion.hh>
#include <qpdf/QPDF.hh>
#include <qpdf/QPDFOutlineObjectHelper.hh>
#include <qpdf/QPDFPageObjectHelper.hh>

#include <functional>
#include <iostream>
#include <list>
#include <map>
#include <memory>
#include <set>
#include <stdexcept>
#include <string>
#include <vector>

class QPDFWriter;
class Pipeline;
class QPDFLogger;

class QPDFJob
{
  public:
    static int constexpr LATEST_JOB_JSON = 1;

    // Exit codes -- returned by getExitCode() after calling run()
    static int constexpr EXIT_ERROR = qpdf_exit_error;
    static int constexpr EXIT_WARNING = qpdf_exit_warning;
    // For is-encrypted and requires-password
    static int constexpr EXIT_IS_NOT_ENCRYPTED = qpdf_exit_is_not_encrypted;
    static int constexpr EXIT_CORRECT_PASSWORD = qpdf_exit_correct_password;

    // QPDFUsage is thrown if there are any usage-like errors when calling Config methods.
    QPDF_DLL
    QPDFJob();

    // SETUP FUNCTIONS

    // Initialize a QPDFJob object from argv, which must be a null-terminated array of
    // null-terminated UTF-8-encoded C strings. The progname_env argument is the name of an
    // environment variable which, if set, overrides the name of the executable for purposes of
    // generating the --completion options. See QPDFArgParser for details. If a null pointer is
    // passed in, the default value of "QPDF_EXECUTABLE" is used. This is used by the QPDF cli,
    // which just initializes a QPDFJob from argv, calls run(), and handles errors and exit status
    // issues. You can perform much of the cli functionality programmatically in this way rather
    // than using the regular API. This is exposed in the C API, which makes it easier to get
    // certain high-level qpdf functionality from other languages. If there are any command-line
    // errors, this method will throw QPDFUsage which is derived from std::runtime_error. Other
    // exceptions may be thrown in some cases. Note that argc, and argv should be UTF-8 encoded. If
    // you are calling this from a Windows Unicode-aware main (wmain), see
    // QUtil::call_main_from_wmain for information about converting arguments to UTF-8. This method
    // will mutate arguments that are passed to it.
    QPDF_DLL
    void initializeFromArgv(char const* const argv[], char const* progname_env = nullptr);

    // Initialize a QPDFJob from json. Passing partial = true prevents this method from doing the
    // final checks (calling checkConfiguration) after processing the json file. This makes it
    // possible to initialize QPDFJob in stages using multiple json files or to have a json file
    // that can be processed from the CLI with --job-json-file and be combined with other arguments.
    // For example, you might include only encryption parameters, leaving it up to the rest of the
    // command-line arguments to provide input and output files. initializeFromJson is called with
    // partial = true when invoked from the command line. To make sure that the json file is fully
    // valid on its own, just don't specify any other command-line flags. If there are any
    // configuration errors, QPDFUsage is thrown. Some error messages may be CLI-centric. If an
    // exception tells you to use the "--some-option" option, set the "someOption" key in the JSON
    // object instead.
    QPDF_DLL
    void initializeFromJson(std::string const& json, bool partial = false);

    // Set name that is used to prefix verbose messages, progress messages, and other things that
    // the library writes to output and error streams on the caller's behalf. Defaults to "qpdf".
    QPDF_DLL
    void setMessagePrefix(std::string const&);
    QPDF_DLL
    std::string getMessagePrefix() const;

    // To capture or redirect output, configure the logger returned by getLogger(). By default, all
    // QPDF and QPDFJob objects share the global logger. If you need a private logger for some
    // reason, pass a new one to setLogger(). See comments in QPDFLogger.hh for details on
    // configuring the logger.
    //
    // If you set a custom logger here, the logger will be passed to all subsequent QPDF objects
    // created by this QPDFJob object.
    QPDF_DLL
    std::shared_ptr<QPDFLogger> getLogger();
    QPDF_DLL
    void setLogger(std::shared_ptr<QPDFLogger>);

    // This deprecated method is the old way to capture output, but it didn't capture all output.
    // See comments above for getLogger and setLogger. This will be removed in QPDF 12. For now, it
    // configures a private logger, separating this object from the default logger, and calls
    // setOutputStreams on that logger. See QPDFLogger.hh for additional details.
    [[deprecated("configure logger from getLogger() or call setLogger()")]] QPDF_DLL void
    setOutputStreams(std::ostream* out_stream, std::ostream* err_stream);

    // You can register a custom progress reporter to be called by QPDFWriter (see
    // QPDFWriter::registerProgressReporter). This is only called if you also request progress
    // reporting through normal configuration methods (e.g., pass --progress, call
    // config()->progress, etc.)
    QPDF_DLL
    void registerProgressReporter(std::function<void(int)>);

    // Check to make sure no contradictory options have been specified. This is called automatically
    // after initializing from argv or json and is also called by run, but you can call it manually
    // as well. It throws a QPDFUsage exception if there are any errors. This Config object (see
    // CONFIGURATION) also has a checkConfiguration method which calls this one.
    QPDF_DLL
    void checkConfiguration();

    // Returns true if output is created by the specified job.
    QPDF_DLL
    bool createsOutput() const;

    // SEE BELOW FOR MORE PUBLIC METHODS AND CLASSES
  private:
    // These structures are private but we need to define them before the public Config classes.
    struct CopyAttachmentFrom
    {
        std::string path;
        std::string password;
        std::string prefix;
    };

    struct AddAttachment
    {
        AddAttachment()
        {
        }

        std::string path;
        std::string key;
        std::string filename;
        std::string creationdate;
        std::string moddate;
        std::string mimetype;
        std::string description;
        bool replace{false};
    };

    struct PageSpec
    {
        PageSpec(std::string const& filename, char const* password, std::string const& range);

        std::string filename;
        std::shared_ptr<char> password;
        std::string range;
    };

  public:
    // CONFIGURATION

    // Configuration classes are implemented in QPDFJob_config.cc.

    // The config() method returns a shared pointer to a Config object. The Config object contains
    // methods that correspond with qpdf command-line arguments. You can use a fluent interface to
    // configure a QPDFJob object that would do exactly the same thing as a specific qpdf command.
    // The example qpdf-job.cc contains an example of this usage. You can also use
    // initializeFromJson or initializeFromArgv to initialize a QPDFJob object.

    // Notes about the Config methods:
    //
    // * Most of the method declarations are automatically generated   in header files that are
    //   included within the class definitions. They correspond in predictable ways to the
    //   command-line arguments and are generated from the same code that generates the command-line
    //   argument parsing code.
    //
    // * Methods return pointers, rather than references, to   configuration objects. References
    //   might feel more familiar to users of fluent interfaces, so why do we use pointers? The
    //   main methods that create them return smart pointers so that users can initialize them when
    //   needed, which you can't do with references. Returning pointers instead of references makes
    //   for a more uniform interface.

    // Maintainer documentation: see the section in README-maintainer called "HOW TO ADD A
    // COMMAND-LINE ARGUMENT", which contains references to additional places in the documentation.

    class Config;

    class AttConfig
    {
        friend class QPDFJob;
        friend class Config;

      public:
        QPDF_DLL
        Config* endAddAttachment();
        QPDF_DLL
        AttConfig* file(std::string const& parameter);

#include <qpdf/auto_job_c_att.hh>

      private:
        AttConfig(Config*);
        AttConfig(AttConfig const&) = delete;

        Config* config;
        AddAttachment att;
    };

    class CopyAttConfig
    {
        friend class QPDFJob;
        friend class Config;

      public:
        QPDF_DLL
        Config* endCopyAttachmentsFrom();
        QPDF_DLL
        CopyAttConfig* file(std::string const& parameter);

#include <qpdf/auto_job_c_copy_att.hh>

      private:
        CopyAttConfig(Config*);
        CopyAttConfig(CopyAttConfig const&) = delete;

        Config* config;
        CopyAttachmentFrom caf;
    };

    class PagesConfig
    {
        friend class QPDFJob;
        friend class Config;

      public:
        QPDF_DLL
        Config* endPages();
        QPDF_DLL
        PagesConfig* pageSpec(
            std::string const& filename, std::string const& range, char const* password = nullptr);

#include <qpdf/auto_job_c_pages.hh>

      private:
        PagesConfig(Config*);
        PagesConfig(PagesConfig const&) = delete;

        Config* config;
    };

    class UOConfig
    {
        friend class QPDFJob;
        friend class Config;

      public:
        QPDF_DLL
        Config* endUnderlayOverlay();
        QPDF_DLL
        UOConfig* file(std::string const& parameter);

#include <qpdf/auto_job_c_uo.hh>

      private:
        UOConfig(Config*);
        UOConfig(PagesConfig const&) = delete;

        Config* config;
    };

    class EncConfig
    {
        friend class QPDFJob;
        friend class Config;

      public:
        QPDF_DLL
        Config* endEncrypt();
        QPDF_DLL
        EncConfig* file(std::string const& parameter);

#include <qpdf/auto_job_c_enc.hh>

      private:
        EncConfig(Config*);
        EncConfig(PagesConfig const&) = delete;

        Config* config;
    };

    class Config
    {
        friend class QPDFJob;

      public:
        // Proxy to QPDFJob::checkConfiguration()
        QPDF_DLL
        void checkConfiguration();

        QPDF_DLL
        Config* inputFile(std::string const& filename);
        QPDF_DLL
        Config* emptyInput();
        QPDF_DLL
        Config* outputFile(std::string const& filename);
        QPDF_DLL
        Config* replaceInput();

        QPDF_DLL
        std::shared_ptr<CopyAttConfig> copyAttachmentsFrom();
        QPDF_DLL
        std::shared_ptr<AttConfig> addAttachment();
        QPDF_DLL
        std::shared_ptr<PagesConfig> pages();
        QPDF_DLL
        std::shared_ptr<UOConfig> overlay();
        QPDF_DLL
        std::shared_ptr<UOConfig> underlay();
        QPDF_DLL
        std::shared_ptr<EncConfig>
        encrypt(int keylen, std::string const& user_password, std::string const& owner_password);

#include <qpdf/auto_job_c_main.hh>

      private:
        Config() = delete;
        Config(Config const&) = delete;
        Config(QPDFJob& job) :
            o(job)
        {
        }
        QPDFJob& o;
    };

    // Return a top-level configuration item. See CONFIGURATION above for details. If an invalid
    // configuration is created (such as supplying contradictory options, omitting an input file,
    // etc.), QPDFUsage is thrown. Note that error messages are CLI-centric, but you can map them
    // into config calls. For example, if an exception tells you to use the --some-option flag, you
    // should call config()->someOption() instead.
    QPDF_DLL
    std::shared_ptr<Config> config();

    // Execute the job
    QPDF_DLL
    void run();

    // The following two methods allow a job to be run in two stages - creation of a QPDF object and
    // writing of the QPDF object. This allows the QPDF object to be modified prior to writing it
    // out. See examples/qpdfjob-remove-annotations for an illustration of its use.

    // Run the first stage of the job. Return a nullptr if the configuration is not valid.
    QPDF_DLL
    std::unique_ptr<QPDF> createQPDF();

    // Run the second stage of the job. Do nothing if a nullptr is passed as parameter.
    QPDF_DLL
    void writeQPDF(QPDF& qpdf);

    // CHECK STATUS -- these methods provide information known after run() is called.

    QPDF_DLL
    bool hasWarnings() const;

    // Return one of the EXIT_* constants defined at the top of the class declaration. This may be
    // called after run() when run() did not throw an exception. Takes into consideration whether
    // isEncrypted or requiresPassword was called. Note that this function does not know whether
    // run() threw an exception, so code that uses this to determine how to exit should explicitly
    // use EXIT_ERROR if run() threw an exception.
    QPDF_DLL
    int getExitCode() const;

    // Return value is bitwise OR of values from qpdf_encryption_status_e
    QPDF_DLL
    unsigned long getEncryptionStatus();

    // HELPER FUNCTIONS -- methods useful for calling in handlers that interact with QPDFJob during
    // run or initialization.

    // If in verbose mode, call the given function, passing in the output stream and message prefix.
    QPDF_DLL
    void doIfVerbose(std::function<void(Pipeline&, std::string const& prefix)> fn);

    // Provide a string that is the help information ("schema" for the qpdf-specific JSON object)
    // for the specified version of JSON output.
    QPDF_DLL
    static std::string json_out_schema(int version);

    [[deprecated("use json_out_schema(version)")]] static std::string QPDF_DLL json_out_schema_v1();

    // Provide a string that is the help information for specified version of JSON format for
    // QPDFJob.
    QPDF_DLL
    static std::string job_json_schema(int version);

    [[deprecated("use job_json_schema(version)")]] static std::string QPDF_DLL job_json_schema_v1();

  private:
    struct RotationSpec
    {
        RotationSpec(int angle = 0, bool relative = false) :
            angle(angle),
            relative(relative)
        {
        }

        int angle;
        bool relative;
    };

    enum password_mode_e { pm_bytes, pm_hex_bytes, pm_unicode, pm_auto };

    struct UnderOverlay
    {
        UnderOverlay(char const* which) :
            which(which),
            to_nr("1-z"),
            from_nr("1-z"),
            repeat_nr("")
        {
        }

        std::string which;
        std::string filename;
        std::shared_ptr<char> password;
        std::string to_nr;
        std::string from_nr;
        std::string repeat_nr;
        std::unique_ptr<QPDF> pdf;
        std::vector<int> to_pagenos;
        std::vector<int> from_pagenos;
        std::vector<int> repeat_pagenos;
    };

    // Helper functions
    static void usage(std::string const& msg);
    static JSON json_schema(int json_version, std::set<std::string>* keys = nullptr);
    static void parse_object_id(std::string const& objspec, bool& trailer, int& obj, int& gen);
    void parseRotationParameter(std::string const&);
    std::vector<int> parseNumrange(char const* range, int max);

    // Basic file processing
    void processFile(
        std::unique_ptr<QPDF>&,
        char const* filename,
        char const* password,
        bool used_for_input,
        bool main_input);
    void processInputSource(
        std::unique_ptr<QPDF>&,
        std::shared_ptr<InputSource> is,
        char const* password,
        bool used_for_input);
    void doProcess(
        std::unique_ptr<QPDF>&,
        std::function<void(QPDF*, char const*)> fn,
        char const* password,
        bool empty,
        bool used_for_input,
        bool main_input);
    void doProcessOnce(
        std::unique_ptr<QPDF>&,
        std::function<void(QPDF*, char const*)> fn,
        char const* password,
        bool empty,
        bool used_for_input,
        bool main_input);

    // Transformations
    void setQPDFOptions(QPDF& pdf);
    void handlePageSpecs(QPDF& pdf, std::vector<std::unique_ptr<QPDF>>& page_heap);
    bool shouldRemoveUnreferencedResources(QPDF& pdf);
    void handleRotations(QPDF& pdf);
    void getUOPagenos(UnderOverlay& uo, std::map<int, std::vector<int>>& pagenos);
    void handleUnderOverlay(QPDF& pdf);
    std::string doUnderOverlayForPage(
        QPDF& pdf,
        UnderOverlay& uo,
        std::map<int, std::vector<int>>& pagenos,
        size_t page_idx,
        std::map<int, QPDFObjectHandle>& fo,
        std::vector<QPDFPageObjectHelper>& pages,
        QPDFPageObjectHelper& dest_page);
    void validateUnderOverlay(QPDF& pdf, UnderOverlay* uo);
    void handleTransformations(QPDF& pdf);
    void addAttachments(QPDF& pdf);
    void copyAttachments(QPDF& pdf);

    // Inspection
    void doInspection(QPDF& pdf);
    void doCheck(QPDF& pdf);
    void showEncryption(QPDF& pdf);
    void doShowObj(QPDF& pdf);
    void doShowPages(QPDF& pdf);
    void doListAttachments(QPDF& pdf);
    void doShowAttachment(QPDF& pdf);

    // Output generation
    void doSplitPages(QPDF& pdf);
    void setWriterOptions(QPDF& pdf, QPDFWriter& w);
    void setEncryptionOptions(QPDF&, QPDFWriter&);
    void maybeFixWritePassword(int R, std::string& password);
    void writeOutfile(QPDF& pdf);
    void writeJSON(QPDF& pdf);

    // JSON
    void doJSON(QPDF& pdf, Pipeline*);
    QPDFObjGen::set getWantedJSONObjects();
    void doJSONObject(Pipeline* p, bool& first, std::string const& key, QPDFObjectHandle&);
    void doJSONObjects(Pipeline* p, bool& first, QPDF& pdf);
    void doJSONObjectinfo(Pipeline* p, bool& first, QPDF& pdf);
    void doJSONPages(Pipeline* p, bool& first, QPDF& pdf);
    void doJSONPageLabels(Pipeline* p, bool& first, QPDF& pdf);
    void doJSONOutlines(Pipeline* p, bool& first, QPDF& pdf);
    void doJSONAcroform(Pipeline* p, bool& first, QPDF& pdf);
    void doJSONEncrypt(Pipeline* p, bool& first, QPDF& pdf);
    void doJSONAttachments(Pipeline* p, bool& first, QPDF& pdf);
    void addOutlinesToJson(
        std::vector<QPDFOutlineObjectHelper> outlines,
        JSON& j,
        std::map<QPDFObjGen, int>& page_numbers);

    enum remove_unref_e { re_auto, re_yes, re_no };

    class Members
    {
        friend class QPDFJob;

      public:
        QPDF_DLL
        ~Members() = default;

      private:
        // These default values are duplicated in help and docs.
        static int constexpr DEFAULT_KEEP_FILES_OPEN_THRESHOLD = 200;
        static int constexpr DEFAULT_OI_MIN_WIDTH = 128;
        static int constexpr DEFAULT_OI_MIN_HEIGHT = 128;
        static int constexpr DEFAULT_OI_MIN_AREA = 16384;
        static int constexpr DEFAULT_II_MIN_BYTES = 1024;

        Members();
        Members(Members const&) = delete;

        std::shared_ptr<QPDFLogger> log;
        std::string message_prefix{"qpdf"};
        bool warnings{false};
        unsigned long encryption_status{0};
        bool verbose{false};
        std::shared_ptr<char> password;
        bool linearize{false};
        bool decrypt{false};
        bool remove_restrictions{false};
        int split_pages{0};
        bool progress{false};
        std::function<void(int)> progress_handler{nullptr};
        bool suppress_warnings{false};
        bool warnings_exit_zero{false};
        bool copy_encryption{false};
        std::string encryption_file;
        std::shared_ptr<char> encryption_file_password;
        bool encrypt{false};
        bool password_is_hex_key{false};
        bool suppress_password_recovery{false};
        password_mode_e password_mode{pm_auto};
        bool allow_insecure{false};
        bool allow_weak_crypto{false};
        std::string user_password;
        std::string owner_password;
        int keylen{0};
        bool r2_print{true};
        bool r2_modify{true};
        bool r2_extract{true};
        bool r2_annotate{true};
        bool r3_accessibility{true};
        bool r3_extract{true};
        bool r3_assemble{true};
        bool r3_annotate_and_form{true};
        bool r3_form_filling{true};
        bool r3_modify_other{true};
        qpdf_r3_print_e r3_print{qpdf_r3p_full};
        bool force_V4{false};
        bool force_R5{false};
        bool cleartext_metadata{false};
        bool use_aes{false};
        bool stream_data_set{false};
        qpdf_stream_data_e stream_data_mode{qpdf_s_compress};
        bool compress_streams{true};
        bool compress_streams_set{false};
        bool recompress_flate{false};
        bool recompress_flate_set{false};
        int compression_level{-1};
        qpdf_stream_decode_level_e decode_level{qpdf_dl_generalized};
        bool decode_level_set{false};
        bool normalize_set{false};
        bool normalize{false};
        bool suppress_recovery{false};
        bool object_stream_set{false};
        qpdf_object_stream_e object_stream_mode{qpdf_o_preserve};
        bool ignore_xref_streams{false};
        bool qdf_mode{false};
        bool preserve_unreferenced_objects{false};
        remove_unref_e remove_unreferenced_page_resources{re_auto};
        bool keep_files_open{true};
        bool keep_files_open_set{false};
        size_t keep_files_open_threshold{DEFAULT_KEEP_FILES_OPEN_THRESHOLD};
        bool newline_before_endstream{false};
        std::string linearize_pass1;
        bool coalesce_contents{false};
        bool flatten_annotations{false};
        int flatten_annotations_required{0};
        int flatten_annotations_forbidden{an_invisible | an_hidden};
        bool generate_appearances{false};
        PDFVersion max_input_version;
        std::string min_version;
        std::string force_version;
        bool show_npages{false};
        bool deterministic_id{false};
        bool static_id{false};
        bool static_aes_iv{false};
        bool suppress_original_object_id{false};
        bool show_encryption{false};
        bool show_encryption_key{false};
        bool check_linearization{false};
        bool show_linearization{false};
        bool show_xref{false};
        bool show_trailer{false};
        int show_obj{0};
        int show_gen{0};
        bool show_raw_stream_data{false};
        bool show_filtered_stream_data{false};
        bool show_pages{false};
        bool show_page_images{false};
        size_t collate{0};
        bool flatten_rotation{false};
        bool list_attachments{false};
        std::string attachment_to_show;
        std::list<std::string> attachments_to_remove;
        std::list<AddAttachment> attachments_to_add;
        std::list<CopyAttachmentFrom> attachments_to_copy;
        int json_version{0};
        std::set<std::string> json_keys;
        std::set<std::string> json_objects;
        qpdf_json_stream_data_e json_stream_data{qpdf_sj_none};
        bool json_stream_data_set{false};
        std::string json_stream_prefix;
        bool test_json_schema{false};
        bool check{false};
        bool optimize_images{false};
        bool externalize_inline_images{false};
        bool keep_inline_images{false};
        bool remove_page_labels{false};
        size_t oi_min_width{DEFAULT_OI_MIN_WIDTH};
        size_t oi_min_height{DEFAULT_OI_MIN_HEIGHT};
        size_t oi_min_area{DEFAULT_OI_MIN_AREA};
        size_t ii_min_bytes{DEFAULT_II_MIN_BYTES};
        UnderOverlay underlay{"underlay"};
        UnderOverlay overlay{"overlay"};
        UnderOverlay* under_overlay{nullptr};
        std::vector<PageSpec> page_specs;
        std::map<std::string, RotationSpec> rotations;
        bool require_outfile{true};
        bool replace_input{false};
        bool check_is_encrypted{false};
        bool check_requires_password{false};
        std::shared_ptr<char> infilename;
        std::shared_ptr<char> outfilename;
        bool json_input{false};
        bool json_output{false};
        std::string update_from_json;
        bool report_mem_usage{false};
    };
    std::shared_ptr<Members> m;
};

#endif // QPDFOBJECT_HH