path: root/mod/module.cli

// file      : mod/options.cli -*- C++ -*-
// license   : MIT; see accompanying LICENSE file

include <map>;
include <regex>;

include <libbpkg/manifest.hxx>; // repository_location
include <libbbot/manifest.hxx>; // interactive_mode

include <web/xhtml/fragment.hxx>;

include <libbrep/types.hxx>;

include <mod/options-types.hxx>;

namespace brep
{
  // Web handler configuration options.
  //
  namespace options
  {
    // Option groups.
    //
    class repository_email
    {
      string email
      {
        "<email>",
        "Repository email. This email is used for the \cb{From:} header in
         emails send by \cb{brep} (for example, build failure notifications)."
      }
    };

    class repository_url
    {
      string host
      {
        "<host>",
        "Repository host. It specifies the scheme and the host address (but
         not the root path; see \cb{root} below) that will be used whenever
         \cb{brep} needs to construct an absolute URL to one of its locations
         (for example, a link to a build log that is being send via email)."
      }

      dir_path root = "/"
      {
        "<path>",
        "Repository root. That is, this is the part of the URL between the
         host name and the start of the repository. For example, root value
         '\cb{/pkg}' means the repository URL is \cb{http://example.org/pkg/}.
         Specify '\cb{/}' to use the web server root
         (\cb{http://example.org/})."
      }
    };

    class build_email_notification: repository_email, repository_url
    {
      std::map<string, build_email> build-toolchain-email
      {
        "<name>=<mode>",
        "Enable or disable package build notification emails. The valid <mode>
         values are \cb{none}, \cb{latest}, and \cb{all}. If \cb{all} is
         specified for a toolchain name, then emails are sent according to the
         \cb{build-*email} package manifest values when all versions of a
         package are built with this toolchain. If \cb{latest} is specified,
         then for this toolchain name the emails are only sent for the latest
         version of a package. If \cb{none} is specified, then no emails are
         sent for this toolchain name. By default the \cb{latest} mode is
         assumed. Repeat this option to enable/disable emails for multiple
         toolchains. See \l{bpkg#manifest-package Package Manifest} for
         details on \cb{build-*email} values."
      }
    };

    class handler
    {
      string tenant-name = "tenant"
      {
        "<name>",
        "Name to call the tenant values on web pages. If not specified, then
         \cb{tenant} is used."
      }

      uint16_t verbosity = 0
      {
        "<level>",
        "Trace verbosity level. Level 0 disables tracing, which is also the
         default."
      }
    };

    class openssl_options
    {
      path openssl = "openssl"
      {
        "<path>",
        "The openssl program to be used for crypto operations. You can also
         specify additional options that should be passed to the openssl
         program with \cb{openssl-option}. If the openssl program is not
         explicitly specified, then \cb{brep} will use \cb{openssl} by
         default."
      }

      strings openssl-option
      {
        "<opt>",
        "Additional option to be passed to the openssl program (see
         \cb{openssl} for details). Repeat this option to specify multiple
         openssl options."
      }

      strings openssl-envvar
      {
        "<name>[=value]",
        "Environment variable to be set (<name>=<value>) or unset (just
         <name>) for the openssl program (see \cb{openssl} for details).
         Repeat this option to specify multiple openssl variables. Note
         that unspecified variables are inherited from the web server
         process.

         You need to at least set the \cb{RANDFILE} environment variable
         to change the default location of the openssl program seed file
         and maybe also the \cb{OPENSSL_CONF} variable if you would like
         to use a custom openssl configuration file."
      }
    };

    class package_db
    {
      string package-db-user
      {
        "<user>",
        "Package database login user name. If not specified, then operating
         system (login) name is used. See also \cb{package-db-role}."
      }

      string package-db-role = "brep"
      {
        "<user>",
        "Package database execution user name. If not empty then the login
         user will be switched (with \cb{SET ROLE}) to this user prior to
         executing any statements. If not specified, then \cb{brep} is used."
      }

      string package-db-password
      {
        "<pass>",
        "Package database password. If not specified, then login without
         password is expected to work."
      }

      string package-db-name = "brep_package"
      {
        "<name>",
        "Package database name. If not specified, then \cb{brep_package} is
         used by default."
      }

      string package-db-host
      {
        "<host>",
        "Package database host name, address, or socket. If not specified, then
         connect to \cb{localhost} using the operating system-default
         mechanism (Unix-domain socket, etc)."
      }

      uint16_t package-db-port = 0
      {
        "<port>",
        "Package database port number. If not specified, the default port is
         used."
      }

      size_t package-db-max-connections = 5
      {
        "<num>",
        "The maximum number of concurrent package database connections per web
         server process. If 0, then no limitation is applied. The default is
         5."
      }

      size_t package-db-retry = 10
      {
        "<num>",
        "The maximum number of times to retry package database transactions in
         the face of recoverable failures (deadlock, loss of connection, etc).
         The default is 10."
      }
    };

    class build: openssl_options
    {
      path build-config
      {
        "<buildtab>",
        "Build configuration file. If not specified, then the package building
         functionality will be disabled. If specified, then the build database
         must be configured (see \cb{build-db-*}). The \cb{brep} instance
         needs to be restarted after modifying <buildtab> for the changes to
         take effect."
      }

      dir_path build-bot-agent-keys
      {
        "<dir>",
        "Directory containing build bot agent public keys. If specified, then
         \cb{brep} will perform agent authentication and will reject build
         results from unauthenticated ones. If not specified, then build
         results are accepted from all agents (which will be a security
         risk if the \cb{brep} instance is publicly accessible).

         The directory is expected to contain one PEM-encoded public key
         per file with the \cb{.pem} extension. All other files and
         subdirectories are ignored. The \cb{brep} instance needs to be
         restarted after adding new key files for the changes to take effect."
      }

      size_t build-forced-rebuild-timeout = 600
      {
        "<seconds>",
        "Time to wait before considering a package for a forced rebuild. Must
         be specified in seconds. Default is 10 minutes."
      }

      size_t build-soft-rebuild-timeout = 86400
      {
        "<seconds>",
        "Time to wait before considering a package for a soft rebuild (only to
         be performed if the build environment or any of the package
         dependencies have changed). Must be specified in seconds. The special
         zero value disables soft rebuilds. Default is 24 hours"
      }

      size_t build-alt-soft-rebuild-timeout
      {
        "<seconds>",
        "Alternative package soft rebuild timeout to use instead of the soft
         rebuild timeout (see \cb{build-soft-rebuild-timeout} for details)
         during the time interval specified with the
         \cb{build-alt-soft-rebuild-start} and
         \cb{build-alt-soft-rebuild-stop} options. Must be specified in
         seconds. Default is the time interval length plus
         \c{(\b{build-soft-rebuild-timeout} - 24h)} if soft rebuild timeout
         is greater than 24 hours (thus the rebuild is only triggered within
         the last 24 hours of the \cb{build-soft-rebuild-timeout} expiration)."
      }

      duration build-alt-soft-rebuild-start
      {
        "<hours>:<minutes>",
        "The start time of the alternative package soft rebuild timeout (see
         \cb{build-alt-soft-rebuild-timeout} for details). Must be specified
         as a time of day in the local timezone. The
         \cb{build-alt-soft-rebuild-start} and
         \cb{build-alt-soft-rebuild-stop} options must be either both
         specified or absent. If unspecified, then no alternative rebuild
         timeout will be used."
      }

      duration build-alt-soft-rebuild-stop
      {
        "<hours>:<minutes>",
        "The end time of the alternative package soft rebuild timeout (see
         \cb{build-alt-soft-rebuild-timeout} for details). Must be specified
         as a time of day in the local timezone. If it is less than the
         \cb{build-alt-soft-rebuild-start} option value, then the time
         interval extends through midnight. The
         \cb{build-alt-soft-rebuild-start} and
         \cb{build-alt-soft-rebuild-stop} options must be either both
         specified or absent. If unspecified, then no alternative rebuild
         timeout will be used."
      }

      size_t build-hard-rebuild-timeout = 604800
      {
        "<seconds>",
        "Time to wait before considering a package for a hard rebuild (to be
         performed unconditionally). Must be specified in seconds. The special
         zero value disables hard rebuilds. Default is 7 days."
      }

      size_t build-alt-hard-rebuild-timeout
      {
        "<seconds>",
        "Alternative package hard rebuild timeout. The semantics is the
         same as for the \cb{build-alt-soft-rebuild-timeout} option but
         for the \cb{build-hard-rebuild-timeout} option."
      }

      duration build-alt-hard-rebuild-start
      {
        "<hours>:<minutes>",
        "The start time of the alternative package hard rebuild timeout (see
         \cb{build-alt-hard-rebuild-timeout} for details). The semantics is
         the same as for the \cb{build-alt-soft-rebuild-start} option but
         for the \cb{build-hard-rebuild-timeout} option."
      }

      duration build-alt-hard-rebuild-stop
      {
        "<hours>:<minutes>",
        "The end time of the alternative package hard rebuild timeout (see
         \cb{build-alt-hard-rebuild-timeout} for details). The semantics is
         the same as for the \cb{build-alt-soft-rebuild-stop} option but
         for the \cb{build-hard-rebuild-timeout} option."
      }

      size_t build-queued-timeout = 30
      {
        "<seconds>",
        "Time to wait before assuming the \cb{queued} notifications are
         delivered for package CI requests submitted via third-party services
         (GitHub, etc). During this time a package is not considered for a
         build. Must be specified in seconds. Default is 30 seconds."
      }
    };

    class build_db
    {
      string build-db-user
      {
        "<user>",
        "Build database login user name. If not specified, then operating
         system (login) name is used. See also \cb{build-db-role}."
      }

      string build-db-role = "brep"
      {
        "<user>",
        "Build database execution user name. If not empty then the login
         user will be switched (with \cb{SET ROLE}) to this user prior to
         executing any statements. If not specified, then \cb{brep} is used."
      }

      string build-db-password
      {
        "<pass>",
        "Build database password. If not specified, then login without
         password is expected to work."
      }

      string build-db-name = "brep_build"
      {
        "<name>",
        "Build database name. If not specified, then \cb{brep_build} is used
         by default."
      }

      string build-db-host
      {
        "<host>",
        "Build database host name, address, or socket. If not specified, then
         connect to \cb{localhost} using the operating system-default
         mechanism (Unix-domain socket, etc)."
      }

      uint16_t build-db-port = 0
      {
        "<port>",
        "Build database port number. If not specified, the default port is
         used."
      }

      size_t build-db-max-connections = 5
      {
        "<num>",
        "The maximum number of concurrent build database connections per web
         server process. If 0, then no limitation is applied. The default is
         5."
      }

      size_t build-db-retry = 10
      {
        "<num>",
        "The maximum number of times to retry build database transactions in
         the face of recoverable failures (deadlock, loss of connection, etc).
         The default is 10."
      }
    };

    class build_upload
    {
      std::map<string, dir_path> upload-data
      {
        "<type>=<dir>",
        "The directory to save upload data to for the specified upload type.
         If unspecified, the build artifacts upload functionality will be
         disabled for this type. See \l{brep The \cb{build2} Repository
         Interface Manual} for more information on build artifacts upload.

         Note that the directory path must be absolute and the directory
         itself must exist and have read, write, and execute permissions
         granted to the user that runs the web server."
      }

      std::map<string, size_t> upload-max-size
      {
        "<type>=<bytes>",
        "The maximum size of the upload data accepted for the specified upload
         type. Note that currently the entire upload request is read into
         memory. The default is 10M."
      }

      std::map<string, string> upload-email
      {
        "<type>=<email>",
        "The build artifacts upload email. If specified, the upload request
         and result manifests will be sent to this address. See \l{brep The
         \cb{build2} Repository Interface Manual} for more information."
      }

      std::map<string, path> upload-handler
      {
        "<type>=<path>",
        "The handler program to be executed on build artifacts upload of the
         specified type. The handler is executed as part of the HTTP request
         and is passed additional arguments that can be specified with
         \cb{upload-handler-argument} followed by the absolute path to the
         upload directory (\cb{upload-data}). See \l{brep The \cb{build2}
         Repository Interface Manual} for more information. Note that the
         program path must be absolute."
      }

      std::multimap<string, string> upload-handler-argument
      {
        "<type>=<arg>",
        "Additional arguments to be passed to the upload handler program for
         the specified upload type (see \cb{upload-handler} for details).
         Repeat this option to specify multiple arguments."
      }

      std::map<string, size_t> upload-handler-timeout
      {
        "<type>=<seconds>",
        "The upload handler program timeout in seconds for the specified
         upload type. If specified and the handler does not exit in the
         allotted time, then it is killed and its termination is treated as
         abnormal."
      }

      std::multimap<string, string> upload-toolchain-exclude
      {
        "<type>=<name>",
        "Disable upload of the specified type for the specified toolchain
         name. Repeat this option to disable uploads for multiple toolchains."
      }

      std::multimap<string, string> upload-repository-exclude
      {
        "<type>=<name>",
        "Disable upload of the specified type for packages from the repository
         with the specified canonical name. Repeat this option to disable
         uploads for multiple repositories."
      }
    };

    class page
    {
      web::xhtml::fragment logo
      {
        "<xhtml>",
        "Web page logo. It is displayed in the page header aligned to the left
         edge. The value is treated as an XHTML5 fragment."
      }

      vector<page_menu> menu
      {
        "<label=link>",
        "Web page menu. Each entry is displayed in the page header in the
         order specified and aligned to the right edge. A link target that
         starts with '\cb{/}' or contains '\cb{:}' is used as is. Otherwise,
         it is prefixed with the repository web interface root."
      }
    };

    class search
    {
      uint16_t search-page-entries = 20
      {
        "<num>",
        "Number of packages per page. The default is 20."
      }

      uint16_t search-pages = 5
      {
        "<num>",
        "Number of pages in navigation (pager). The default is 5."
      }
    };

    class package
    {
      uint16_t package-description = 500
      {
        "<len>",
        "Number of package description characters to display in brief pages.
         The default is 500 (~ 80 characters * 6 lines)."
      }

      uint16_t package-changes = 5000
      {
        "<len>",
        "Number of package changes characters to display in brief pages. The
         default is 5000 (~ 80 chars x 60 lines)."
      }
    };

    // Handler options.
    //

    class packages: search, package_db, page, repository_url, handler
    {
      string search-title = "Packages"
      {
        "<text>",
        "Package search page title. It is placed inside XHTML5 <title>
         element."
      }

      web::xhtml::fragment search-description
      {
        "<xhtml>",
        "Package search page description. If specified, it is displayed
         before the search form on the first page only. The value is
         treated as an XHTML5 fragment."
      }
    };

    class package_details: package, package_db,
                           search,
                           page,
                           repository_url,
                           handler
    {
    };

    class package_version_details: package, package_db,
                                   build, build_db,
                                   page,
                                   repository_url,
                                   handler
    {
      dir_path bindist-root
      {
        "<dir>",
        "The root directory where the uploaded binary distribution packages
         are saved to under the following directory hierarchy:

         \
         [<tenant>/]<distribution>/<os-release>/<project>/<package>/<version>/<package-config>
         \

         The package configuration directory symlinks that match these paths
         are mapped to web URLs based on the \cb{bindist-url} value and
         displayed on the package version details page. If this option is
         specified, then \cb{bindist-url} must be specified as well."
      }

      string bindist-url
      {
        "<url>",
        "The root URL of the directory specified with the \cb{bindist-root}
         option. This option must be specified if \cb{bindist-root} is
         specified."
      }
    };

    class repository_details: package_db, page, repository_url, handler
    {
    };

    class build_task: build, build_db,
                      build_upload,
                      build_email_notification,
                      handler
    {
      size_t build-task-request-max-size = 102400
      {
        "<bytes>",
        "The maximum size of the build task request manifest accepted. Note
         that the HTTP POST request body is cached to retry database
         transactions in the face of recoverable failures (deadlock, loss of
         connection, etc). The default is 100K."
      }

      size_t build-result-timeout = 10800
      {
        "<seconds>",
        "Time to wait before considering the expected task result lost. Must be
         specified in seconds. The default is 3 hours."
      }

      vector<pair<std::regex, string>> build-interactive-login
      {
        "</regex/replacement/>",
        "Regular expressions for transforming the interactive build login
         information, for example, into the actual command that can be used
         by the user. The regular expressions are matched against the
         \"<agent>\ <interactive-login>\" string containing the respective
         task request manifest values. The first matching expression is used
         for the transformation. If no expression matches, then the task
         request is considered invalid, unless no expressions are specified.
         Repeat this option to specify multiple expressions."
      }

      build_order build-package-order = build_order::stable
      {
        "<order>",
        "Order in which packages are considered for build. The valid <order>
         values are \cb{stable} and \cb{random}. If not specified, then
         \cb{stable} is assumed. Note that interactive builds are always
         preferred."
      }
    };

    class build_result: build, build_db,
                        build_email_notification,
                        handler
    {
      size_t build-result-request-max-size = 10485760
      {
        "<bytes>",
        "The maximum size of the build result manifest accepted. Note that the
         HTTP POST request body is cached to retry database transactions in the
         face of recoverable failures (deadlock, loss of connection, etc). The
         default is 10M."
      }
    };

    class build_log: build, build_db, repository_url, handler
    {
    };

    class build_force: build, build_db, handler
    {
    };

    class builds: build, build_db, page, repository_url, handler
    {
      uint16_t build-page-entries = 20
      {
        "<num>",
        "Number of builds per page. The default is 20."
      }

      uint16_t build-pages = 5
      {
        "<num>",
        "Number of pages in navigation (pager). The default is 5."
      }
    };

    class build_configs: build, page, repository_url, handler
    {
      uint16_t build-config-page-entries = 20
      {
        "<num>",
        "Number of build configurations per page. The default is 20."
      }

      uint16_t build-config-pages = 5
      {
        "<num>",
        "Number of pages in navigation (pager). The default is 5."
      }
    };

    class submit: page, repository_email, repository_url, handler
    {
      dir_path submit-data
      {
        "<dir>",
        "The directory to save final submission data to. If unspecified, the
         package submission functionality will be disabled. If specified,
         then \cb{submit-temp} must be specified as well. See \l{brep The
         \cb{build2} Repository Interface Manual} for more information on
         package submission.

         Note that the directory path must be absolute and the directory
         itself must exist and have read, write, and execute permissions
         granted to the user that runs the web server."
      }

      dir_path submit-temp
      {
        "<dir>",
        "The directory to save temporary submission data to. Must be specified
         if the package submission functionality is enabled.

         Note that this directory must be on the same filesystem and satisfy
         the same requirements as \cb{submit-data}. It is also the user's
         responsibility to clean it up after an unclean web server shutdown."
      }

      size_t submit-max-size = 10485760
      {
        "<bytes>",
        "The maximum size of the submission data accepted. Note that currently
         the entire submission request is read into memory. The default is
         10M."
      }

      path submit-form
      {
        "<file>",
        "The package submission form fragment. If specified, then its contents
         are treated as an XHTML5 fragment that is inserted into the <body>
         element of the submission page. If unspecified, then no submission
         page will be displayed. Note that the file path must be absolute."
      }

      string submit-email
      {
        "<email>",
        "The package submission email. If specified, the submission request
         and result manifests will be sent to this address. See \l{brep The
         \cb{build2} Repository Interface Manual} for more information."
      }

      path submit-handler
      {
        "<path>",
        "The handler program to be executed on package submission. The handler
         is executed as part of the HTTP request and is passed additional
         arguments that can be specified with \cb{submit-handler-argument}
         followed by the absolute path to the submission directory. See
         \l{brep The \cb{build2} Repository Interface Manual} for more
         information. Note that the program path must be absolute."
      }

      strings submit-handler-argument
      {
        "<arg>",
        "Additional arguments to be passed to the submission handler program
         (see \cb{submit-handler} for details). Repeat this option to specify
         multiple arguments."
      }

      size_t submit-handler-timeout
      {
        "<seconds>",
        "The submission handler program timeout in seconds. If specified and
         the handler does not exit in the allotted time, then it is killed and
         its termination is treated as abnormal."
      }
    };

    class ci_start: repository_email
    {
      dir_path ci-data
      {
        "<dir>",
        "The directory to save CI request data to. If unspecified, the
         package CI functionality will be disabled. See \l{brep The
         \cb{build2} Repository Interface Manual} for more information on
         package CI.

         Note that the directory path must be absolute and the directory
         itself must exist and have read, write, and execute permissions
         granted to the user that runs the web server."
      }

      string ci-email
      {
        "<email>",
        "The package CI email. If specified, the CI request and result
         manifests will be sent to this address. See \l{brep The \cb{build2}
         Repository Interface Manual} for more information."
      }

      path ci-handler
      {
        "<path>",
        "The handler program to be executed on CI request. The handler is
         executed as part of the HTTP request and is passed additional
         arguments that can be specified with \cb{ci-handler-argument}
         followed by the absolute path to the CI request directory. See
         \l{brep The \cb{build2} Repository Interface Manual} for more
         information. Note that the program path must be absolute."
      }

      strings ci-handler-argument
      {
        "<arg>",
        "Additional arguments to be passed to the CI handler program (see
         \cb{ci-handler} for details). Repeat this option to specify multiple
         arguments."
      }

      size_t ci-handler-timeout
      {
        "<seconds>",
        "The CI handler program timeout in seconds. If specified and the
         handler does not exit in the allotted time, then it is killed and
         its termination is treated as abnormal."
      }
    };

    class ci_cancel
    {
    };

    class ci: ci_start, page, repository_url, handler
    {
      // Classic CI-specific options.
      //

      path ci-form
      {
        "<file>",
        "The package CI form fragment. If specified, then its contents are
         treated as an XHTML5 fragment that is inserted into the <body>
         element of the CI page. If unspecified, then no CI page will be
         displayed. Note that the file path must be absolute."
      }
    };

    class ci_github: ci_start, ci_cancel, build_db, handler
    {
      // GitHub CI-specific options (e.g., request timeout when invoking
      // GitHub APIs).
      //
    };

    class upload: build, build_db, build_upload, repository_email, handler
    {
    };

    class repository_root: repository_url, handler
    {
      string root-global-view = "packages"
      {
        "<service>",
        "The default view to display for the global repository root. The
         <service> argument is one of the supported services (\cb{packages},
         \cb{builds}, \cb{submit}, \cb{ci}, etc). The default service is
         packages."
      }

      string root-tenant-view = "packages"
      {
        "<service>",
        "The default view to display for the tenant repository root. The
         <service> argument is one of the supported services (\cb{packages},
         \cb{builds}, \cb{submit}, \cb{ci}, etc). The default service is
         packages."
      }
    };
  }

  // Web handler HTTP request parameters.
  //
  namespace params
  {
    // Use parameters long names in the C++ code, short aliases (if present)
    // in HTTP URL.
    //
    class packages
    {
      // Display package search result list starting from this page.
      //
      uint16_t page | p;

      // Package search criteria.
      //
      // Note that the packages parameter is renamed to '_' by the root
      // handler (see the request_proxy class for details).
      //
      string q | _;
    };

    class package_details
    {
      // Display package version search result list starting from this page.
      //
      uint16_t page | p;

      // Package version search criteria.
      //
      string query | q;

      // Page form.
      //
      page_form form | f = page_form::brief;
    };

    class package_version_details
    {
      // Page form.
      //
      page_form form | f = page_form::brief;
    };

    class repository_details
    {
      // No parameters so far.
      //
    };

    class build_task
    {
      // Only consider packages from repositories with these canonical names
      // (note: including pkg: type).
      //
      vector<string> repository | r;

      // Only consider tenants with this interactive build mode.
      //
      bbot::interactive_mode interactive = bbot::interactive_mode::both;
    };

    class build_result
    {
      // No parameters so far.
      //
    };

    class build_log
    {
      // No parameters so far.
      //
    };

    // All parameters are non-optional.
    //
    class build_force
    {
      // Package name.
      //
      string package | pn;

      // Package version. May not be url-encoded, in which case the plus
      // character is considered literally (rather than as the encoded space
      // character). In other words, after url-decoding the space character is
      // treated the same way as the plus character.
      //
      // @@ Make it of the version type? Maybe after it get moved to
      //    libbpkg/types.hxx or at least the second use case appear.
      //
      string version | pv;

      // Package build target.
      //
      string target | tg;

      // Target build configuration.
      //
      string target_config | tc;

      // Package build configuration.
      //
      string package_config | pc;

      // Toolchain name.
      //
      string toolchain_name | tn;

      // Toolchain version. May not be url-encoded (see above).
      //
      string toolchain_version | tv;

      // Package rebuild reason. Must not be empty.
      //
      string reason;
    };

    class builds
    {
      // Display packages build configurations list starting from this page.
      //
      uint16_t page | p;

      // Package builds query filter options.
      //

      // Package name wildcard. An empty value is treated the same way as *.
      //
      // We used to generate URLs like:
      //
      // https://cppget.org/?builds&pn=bbot
      //
      // This looked a bit verbose, so now we produce URLs like:
      //
      // https://cppget.org/?builds=bbot
      //
      // Note that the builds parameter is renamed to '_' by the root handler
      // (see the request_proxy class for details).
      //
      string name | _;

      // Package version. If empty or *, then no version constraint is applied.
      // Otherwise the build package version must match the value exactly.
      //
      string version | pv;

      // Package build toolchain in the <name>-<version> form. If *, then no
      // toolchain constraint is applied. Otherwise the build toolchain name
      // and version must match the value exactly.
      //
      string toolchain | th = "*";

      // Package build target wildcard. An empty value is treated the same way
      // as *.
      //
      string target | tg;

      // Package build target configuration name wildcard. An empty value is
      // treated the same way as *.
      //
      string target_config | tc;

      // Package build package configuration name wildcard. An empty value is
      // treated the same way as *.
      //
      string package_config | pc;

      // Package build result. If *, then no build result constraint is
      // applied. Otherwise the value is supposed to be the one of the
      // following (ordered) statuses: pending, building, success, warning,
      // error, abort, abnormal. The first 3 statuses are checked for equality,
      // the rest - for being greater or equal.
      //
      string result | rs = "*";
    };

    class build_configs
    {
      // By default, display all build configurations except those which
      // belong to the 'hidden' class.
      //
      // Note that the build-configs parameter is renamed to '_' by the root
      // handler (see the request_proxy class for details).
      //
      string class_name | _;

      // Display build configurations list starting from this page.
      //
      uint16_t page | p;
    };

    // Parameters, except simulate, must either be all present (actual
    // submission) or absent (submission form request).
    //
    // Note also that besides these parameters there can be others. We don't
    // recognize their semantics and just save them to the submission request
    // manifest.
    //
    class submit
    {
      // Package archive file name. Must be <input type="file"/>.
      //
      // Note that it can potentially be not just a name but a file path and
      // in the client's form (e.g., Windows).
      //
      string archive;

      // Package archive file SHA256 checksum.
      //
      string sha256sum;

      // Submission simulation outcome.
      //
      string simulate;
    };

    // Parameters, except simulate, must either be all present (actual CI
    // request) or absent (CI form request).
    //
    // Note also that besides these parameters there can be others. We don't
    // recognize their semantics and just save them to the CI request
    // manifest.
    //
    class ci
    {
      // Package repository location.
      //
      // Note that the ci parameter is renamed to '_' by the root handler (see
      // the request_proxy class for details).
      //
      bpkg::repository_location repository | _;

      // Package names/versions.
      //
      strings package;

      // Overrides file name. Must be <input type="file"/>.
      //
      // Note that we don't really need this name and only check if this
      // parameter is specified to detect presence of the upload.
      //
      string overrides;

      // Interactive build execution breakpoint.
      //
      string interactive;

      // Submission simulation outcome.
      //
      string simulate;
    };

    // Parameters other than challenge must be all present.
    //
    // Note also that besides these parameters there can be others. We don't
    // recognize their semantics and just save them to the upload request
    // manifest.
    //
    class upload
    {
      // Upload type.
      //
      // Note that the upload parameter is renamed to '_' by the root handler
      // (see the request_proxy class for details).
      //
      string type | _;

      // Session id as returned by brep in the task response.
      //
      string session;

      // Answer to the private key challenge as posed by brep in the task
      // response. It must be present only if the challenge value was present
      // in the task response.
      //
      string challenge;

      // Upload instance name.
      //
      string instance;

      // Package archive file name. Must be <input type="file"/>.
      //
      // Note that it can potentially be not just a name but a file path.
      //
      string archive;

      // Package archive file SHA256 checksum.
      //
      string sha256sum;
    };
  }
}