https://github.com/temoto/robotstxt

The robots.txt exclusion protocol implementation for Go language
https://github.com/temoto/robotstxt

go go-library golang golang-library production-ready robots-txt status-active web

Last synced: 30 days ago
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The robots.txt exclusion protocol implementation for Go language

• Host: GitHub
• URL: https://github.com/temoto/robotstxt
• Owner: temoto
• License: mit
• Created: 2010-07-12T10:54:05.000Z (over 14 years ago)
• Default Branch: master
• Last Pushed: 2022-11-09T09:51:34.000Z (about 2 years ago)
• Last Synced: 2024-06-19T12:43:54.162Z (5 months ago)
• Topics: go, go-library, golang, golang-library, production-ready, robots-txt, status-active, web
• Language: Go
• Homepage:
• Size: 94.7 KB
• Stars: 266
• Watchers: 10
• Forks: 55
• Open Issues: 4
• Metadata Files:
  • Readme: README.rst
  • License: LICENSE

Awesome Lists containing this project

README

        
What

====

This is a robots.txt exclusion protocol implementation for Go language (golang).

Build

=====

To build and run tests run `go test` in source directory.

Contribute

==========

Warm welcome.

* If desired, add your name in README.rst, section Who.

* Run `script/test && script/clean && echo ok`

* You can ignore linter warnings, but everything else must pass.

* Send your change as pull request or just a regular patch to current maintainer (see section Who).

Thank you.

Usage

=====

As usual, no special installation is required, just

    import "github.com/temoto/robotstxt"

run `go get` and you're ready.

1. Parse

^^^^^^^^

First of all, you need to parse robots.txt data. You can do it with

functions `FromBytes(body []byte) (*RobotsData, error)` or same for `string`::

    robots, err := robotstxt.FromBytes([]byte("User-agent: *\nDisallow:"))

    robots, err := robotstxt.FromString("User-agent: *\nDisallow:")

As of 2012-10-03, `FromBytes` is the most efficient method, everything else

is a wrapper for this core function.

There are few convenient constructors for various purposes:

* `FromResponse(*http.Response) (*RobotsData, error)` to init robots data

from HTTP response. It *does not* call `response.Body.Close()`::

    robots, err := robotstxt.FromResponse(resp)

    resp.Body.Close()

    if err != nil {

        log.Println("Error parsing robots.txt:", err.Error())

    }

* `FromStatusAndBytes(statusCode int, body []byte) (*RobotsData, error)` or

`FromStatusAndString` if you prefer to read bytes (string) yourself.

Passing status code applies following logic in line with Google's interpretation

of robots.txt files:

    * status 2xx  -> parse body with `FromBytes` and apply rules listed there.

    * status 4xx  -> allow all (even 401/403, as recommended by Google).

    * other (5xx) -> disallow all, consider this a temporary unavailability.

2. Query

^^^^^^^^

Parsing robots.txt content builds a kind of logic database, which you can

query with `(r *RobotsData) TestAgent(url, agent string) (bool)`.

Explicit passing of agent is useful if you want to query for different agents. For

single agent users there is an efficient option: `RobotsData.FindGroup(userAgent string)`

returns a structure with `.Test(path string)` method and `.CrawlDelay time.Duration`.

Simple query with explicit user agent. Each call will scan all rules.

::

    allow := robots.TestAgent("/", "FooBot")

Or query several paths against same user agent for performance.

::

    group := robots.FindGroup("BarBot")

    group.Test("/")

    group.Test("/download.mp3")

    group.Test("/news/article-2012-1")

Who

===

Honorable contributors (in undefined order):

    * Ilya Grigorik (igrigorik)

    * Martin Angers (PuerkitoBio)

    * Micha Gorelick (mynameisfiber)

Initial commit and other: Sergey Shepelev [email protected]

Flair

=====

.. image:: https://travis-ci.org/temoto/robotstxt.svg?branch=master

    :target: https://travis-ci.org/temoto/robotstxt

.. image:: https://codecov.io/gh/temoto/robotstxt/branch/master/graph/badge.svg

    :target: https://codecov.io/gh/temoto/robotstxt

.. image:: https://goreportcard.com/badge/github.com/temoto/robotstxt

    :target: https://goreportcard.com/report/github.com/temoto/robotstxt