NAME

Sah::Schema::net::hostname - Hostname

VERSION

This document describes version 0.011 of Sah::Schema::net::hostname (from Perl distribution Sah-Schemas-Net), released on 2022-05-03.

SYNOPSIS

Sample data and validation results against this schema

 ""  # INVALID

 "example"  # valid

 "example.com"  # valid

 "www.example.com"  # valid

 "12.34.56.78"  # valid

 "www_new.example.com"  # INVALID (Underscore not allowed)

 "www.example-two.com"  # valid

 "www.example--two.com"  # valid

 "www.example-.com"  # INVALID (Word ending in dash not allowed)

 "www.-example.com"  # INVALID (Word starting in dash not allowed)

 "www.-example.com"  # INVALID (Word starting in dash not allowed)

Using with Data::Sah

To check data against this schema (requires Data::Sah):

 use Data::Sah qw(gen_validator);
 my $validator = gen_validator("net::hostname*");
 say $validator->($data) ? "valid" : "INVALID!";

The above schema returns a boolean value (true if data is valid, false if otherwise). To return an error message string instead (empty string if data is valid, a non-empty error message otherwise):

 my $validator = gen_validator("net::hostname", {return_type=>'str_errmsg'});
 my $errmsg = $validator->($data);
 
 # a sample valid data
 $data = "www.example--two.com";
 my $errmsg = $validator->($data); # => ""
 
 # a sample invalid data
 $data = "www_new.example.com";
 my $errmsg = $validator->($data); # => "Must match regex pattern \\A(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\\-]*[a-zA-Z0-9])\\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\\-]*[A-Za-z0-9])\\z"

Often a schema has coercion rule or default value, so after validation the validated value is different. To return the validated (set-as-default, coerced, prefiltered) value:

 my $validator = gen_validator("net::hostname", {return_type=>'str_errmsg+val'});
 my $res = $validator->($data); # [$errmsg, $validated_val]
 
 # a sample valid data
 $data = "www.example--two.com";
 my $res = $validator->($data); # => ["","www.example--two.com"]
 
 # a sample invalid data
 $data = "www_new.example.com";
 my $res = $validator->($data); # => ["Must match regex pattern \\A(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\\-]*[a-zA-Z0-9])\\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\\-]*[A-Za-z0-9])\\z","www_new.example.com"]

Data::Sah can also create validator that returns a hash of detaild error message. Data::Sah can even create validator that targets other language, like JavaScript, from the same schema. Other things Data::Sah can do: show source code for validator, generate a validator code with debug comments and/or log statements, generate human text from schema. See its documentation for more details.

Using with Params::Sah

To validate function parameters against this schema (requires Params::Sah):

 use Params::Sah qw(gen_validator);

 sub myfunc {
     my @args = @_;
     state $validator = gen_validator("net::hostname*");
     $validator->(\@args);
     ...
 }

Using with Perinci::CmdLine::Lite

To specify schema in Rinci function metadata and use the metadata with Perinci::CmdLine (Perinci::CmdLine::Lite) to create a CLI:

 # in lib/MyApp.pm
 package
   MyApp;
 our %SPEC;
 $SPEC{myfunc} = {
     v => 1.1,
     summary => 'Routine to do blah ...',
     args => {
         arg1 => {
             summary => 'The blah blah argument',
             schema => ['net::hostname*'],
         },
         ...
     },
 };
 sub myfunc {
     my %args = @_;
     ...
 }
 1;

 # in myapp.pl
 package
   main;
 use Perinci::CmdLine::Any;
 Perinci::CmdLine::Any->new(url=>'/MyApp/myfunc')->run;

 # in command-line
 % ./myapp.pl --help
 myapp - Routine to do blah ...
 ...

 % ./myapp.pl --version

 % ./myapp.pl --arg1 ...

DESCRIPTION

Hostname is checked using a regex as per RFC 1123.

Ref: https://stackoverflow.com/questions/106179/regular-expression-to-match-dns-hostname-or-ip-address

HOMEPAGE

Please visit the project's homepage at https://metacpan.org/release/Sah-Schemas-Net.

SOURCE

Source repository is at https://github.com/perlancar/perl-Sah-Schemas-Net.

AUTHOR

perlancar <perlancar@cpan.org>

CONTRIBUTING

To contribute, you can send patches by email/via RT, or send pull requests on GitHub.

Most of the time, you don't need to build the distribution yourself. You can simply modify the code, then test via:

 % prove -l

If you want to build the distribution (e.g. to try to install it locally on your system), you can install Dist::Zilla, Dist::Zilla::PluginBundle::Author::PERLANCAR, and sometimes one or two other Dist::Zilla plugin and/or Pod::Weaver::Plugin. Any additional steps required beyond that are considered a bug and can be reported to me.

COPYRIGHT AND LICENSE

This software is copyright (c) 2022, 2021, 2020, 2019, 2018, 2016 by perlancar <perlancar@cpan.org>.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

BUGS

Please report any bugs or feature requests on the bugtracker website https://rt.cpan.org/Public/Dist/Display.html?Name=Sah-Schemas-Net

When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.

cpanm Sah::Schemas::Net

perl -MCPAN -e shell
install Sah::Schemas::Net