goose

package module
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 Go to latest Published: Jun 11, 2018 License: Apache-2.0 Imports: 23 Imported by: 0

README

GoOse

HTML Content / Article Extractor in Golang

Build Status Coverage Status Go Report Card GoDoc

Description

This is a golang port of "Goose" originaly licensed to Gravity.com under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership.

Golang port was written by Antonio Linari

Gravity.com licenses this file to you 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.

INSTALL

go get github.com/advancedlogic/GoOse

HOW TO USE IT

package main

import (
	"github.com/advancedlogic/GoOse"
)

func main() {
	g := goose.New()
	article, _ := g.ExtractFromURL("http://edition.cnn.com/2012/07/08/opinion/banzi-ted-open-source/index.html")
	println("title", article.Title)
	println("description", article.MetaDescription)
	println("keywords", article.MetaKeywords)
	println("content", article.CleanedText)
	println("url", article.FinalURL)
	println("top image", article.TopImage)
}

Development - Getting started

This application is written in GO language, please refere to the guides in https://golang.org for getting started.

This project include a Makefile that allows you to test and build the project with simple commands. To see all available options:

make help

Before committing the code, please check if it passes all tests using

make deps
make qa

TODO

  • better organize code
  • improve "xpath" like queries
  • add other image extractions techniques (imagemagick)

THANKS TO

@Martin Angers for goquery
@Fatih Arslan for set
GoLang team for the amazing language and net/html

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func NormaliseCharset 

func NormaliseCharset(characterSet string) string

NormaliseCharset Overrides/fixes charset names to something we can parse. Fixes common mispellings and uses a canonical name for equivalent encodings. @see https://encoding.spec.whatwg.org#names-and-labels

func OpenGraphResolver 

func OpenGraphResolver(doc *goquery.Document) string

OpenGraphResolver return OpenGraph properties

func ReadLinesOfFile 

func ReadLinesOfFile(filename string) []string

ReadLinesOfFile returns the lines from a file as a slice of strings

func UTF8encode 

func UTF8encode(raw string, sourceCharset string) string

UTF8encode converts a string from the source character set to UTF-8, skipping invalid byte sequences @see http://stackoverflow.com/questions/32512500/ignore-illegal-bytes-when-decoding-text-with-go

func WebPageImageResolver 

func WebPageImageResolver(doc *goquery.Document) ([]candidate, int)

WebPageResolver fetches all candidate images from the HTML page

func WebPageResolver 

func WebPageResolver(article *Article) string

WebPageResolver fetches the main image from the HTML page

Types

type Article 

type Article struct {
	Title           string             `json:"title,omitempty"`
	CleanedText     string             `json:"content,omitempty"`
	MetaDescription string             `json:"description,omitempty"`
	MetaLang        string             `json:"lang,omitempty"`
	MetaFavicon     string             `json:"favicon,omitempty"`
	MetaKeywords    string             `json:"keywords,omitempty"`
	CanonicalLink   string             `json:"canonicalurl,omitempty"`
	Domain          string             `json:"domain,omitempty"`
	TopNode         *goquery.Selection `json:"-"`
	TopImage        string             `json:"image,omitempty"`
	Tags            *set.Set           `json:"tags,omitempty"`
	Movies          *set.Set           `json:"movies,omitempty"`
	FinalURL        string             `json:"url,omitempty"`
	LinkHash        string             `json:"linkhash,omitempty"`
	RawHTML         string             `json:"rawhtml,omitempty"`
	Doc             *goquery.Document  `json:"-"`
	Links           []string           `json:"links,omitempty"`
	PublishDate     *time.Time         `json:"publishdate,omitempty"`
	AdditionalData  map[string]string  `json:"additionaldata,omitempty"`
	Delta           int64              `json:"delta,omitempty"`
}

Article is a collection of properties extracted from the HTML body

func (*Article) ToString 

func (article *Article) ToString() string

ToString is a simple method to just show the title TODO: add more fields and pretty print

type Cleaner 

type Cleaner struct {
	// contains filtered or unexported fields
}

Cleaner removes menus, ads, sidebars, etc. and leaves the main content

func NewCleaner 

func NewCleaner(config Configuration) Cleaner

NewCleaner returns a new instance of a Cleaner

func (*Cleaner) Clean 

func (c *Cleaner) Clean(docToClean *goquery.Document) *goquery.Document

Clean removes HTML elements around the main content and prepares the document for parsing

type Configuration 

type Configuration struct {
	// contains filtered or unexported fields
}

Configuration is a wrapper for various config options

func GetDefaultConfiguration 

func GetDefaultConfiguration(args ...string) Configuration

GetDefaultConfiguration returns safe default configuration options

type ContentExtractor 

type ContentExtractor struct {
	// contains filtered or unexported fields
}

ContentExtractor can parse the HTML and fetch various properties

func NewExtractor 

func NewExtractor(config Configuration) ContentExtractor

NewExtractor returns a configured HTML parser

func (*ContentExtractor) CalculateBestNode 

func (extr *ContentExtractor) CalculateBestNode(document *goquery.Document) *goquery.Selection

CalculateBestNode checks for the HTML node most likely to contain the main content. we're going to start looking for where the clusters of paragraphs are. We'll score a cluster based on the number of stopwords and the number of consecutive paragraphs together, which should form the cluster of text that this node is around also store on how high up the paragraphs are, comments are usually at the bottom and should get a lower score 

func (extr *ContentExtractor) GetCanonicalLink(document *goquery.Document) string

GetCanonicalLink returns the meta canonical link set in the source 

func (extr *ContentExtractor) GetCleanTextAndLinks(topNode *goquery.Selection, lang string) (string, []string)

GetCleanTextAndLinks parses the main HTML node for text and links

func (*ContentExtractor) GetDomain 

func (extr *ContentExtractor) GetDomain(canonicalLink string) string

GetDomain extracts the domain from a link

func (*ContentExtractor) GetFavicon 

func (extr *ContentExtractor) GetFavicon(document *goquery.Document) string

GetFavicon returns the favicon set in the source, if the article has one

func (*ContentExtractor) GetMetaAuthor 

func (extr *ContentExtractor) GetMetaAuthor(document *goquery.Document) string

GetMetaAuthor returns the meta author set in the source, if the article has one

func (*ContentExtractor) GetMetaContent 

func (extr *ContentExtractor) GetMetaContent(document *goquery.Document, metaName string) string

GetMetaContent returns the content attribute of meta tag with the given property name

func (*ContentExtractor) GetMetaContentLocation 

func (extr *ContentExtractor) GetMetaContentLocation(document *goquery.Document) string

GetMetaContentLocation returns the meta content location set in the source, if the article has one

func (*ContentExtractor) GetMetaContentWithSelector 

func (extr *ContentExtractor) GetMetaContentWithSelector(document *goquery.Document, selector string) string

GetMetaContentWithSelector returns the content attribute of meta tag matching the selector

func (*ContentExtractor) GetMetaContents 

func (extr *ContentExtractor) GetMetaContents(document *goquery.Document, metaNames *set.Set) map[string]string

GetMetaContents returns all the meta tags as name->content pairs

func (*ContentExtractor) GetMetaDescription 

func (extr *ContentExtractor) GetMetaDescription(document *goquery.Document) string

GetMetaDescription returns the meta description set in the source, if the article has one

func (*ContentExtractor) GetMetaKeywords 

func (extr *ContentExtractor) GetMetaKeywords(document *goquery.Document) string

GetMetaKeywords returns the meta keywords set in the source, if the article has them

func (*ContentExtractor) GetMetaLanguage 

func (extr *ContentExtractor) GetMetaLanguage(document *goquery.Document) string

GetMetaLanguage returns the meta language set in the source, if the article has one

func (*ContentExtractor) GetPublishDate 

func (extr *ContentExtractor) GetPublishDate(document *goquery.Document) *time.Time

GetPublishDate returns the publication date, if one can be located.

func (*ContentExtractor) GetTags 

func (extr *ContentExtractor) GetTags(document *goquery.Document) *set.Set

GetTags returns the tags set in the source, if the article has them

func (*ContentExtractor) GetTitle 

func (extr *ContentExtractor) GetTitle(document *goquery.Document) string

GetTitle returns the title set in the source, if the article has one

func (*ContentExtractor) PostCleanup 

func (extr *ContentExtractor) PostCleanup(targetNode *goquery.Selection) *goquery.Selection

PostCleanup removes any divs that looks like non-content, clusters of links, or paras with no gusto

type Crawler 

type Crawler struct {
	RawHTML string
	Charset string
	// contains filtered or unexported fields
}

Crawler can fetch the target HTML page

func NewCrawler 

func NewCrawler(config Configuration, url string, RawHTML string) Crawler

NewCrawler returns a crawler object initialised with the URL and the [optional] raw HTML body

func (Crawler) Crawl 

func (c Crawler) Crawl() (*Article, error)

Crawl fetches the HTML body and returns an Article

func (Crawler) GetCharset 

func (c Crawler) GetCharset(document *goquery.Document) string

GetCharset returns a normalised charset string extracted from the meta tags

func (Crawler) GetContentType 

func (c Crawler) GetContentType(document *goquery.Document) string

GetContentType returns the Content-Type string extracted from the meta tags

func (*Crawler) Preprocess 

func (c *Crawler) Preprocess() (*goquery.Document, error)

Preprocess fetches the HTML page if needed, converts it to UTF-8 and applies some text normalisation to guarantee better results when extracting the content

func (*Crawler) SetCharset 

func (c *Crawler) SetCharset(cs string)

SetCharset can be used to force a charset (e.g. when read from the HTTP headers) rather than relying on the detection from the HTML meta tags

type Goose 

type Goose struct {
	// contains filtered or unexported fields
}

Goose is the main entry point of the program

func New 

func New(args ...string) Goose

New returns a new instance of the article extractor

func (Goose) ExtractFromRawHTML 

func (g Goose) ExtractFromRawHTML(url string, RawHTML string) (*Article, error)

ExtractFromRawHTML returns an article object from the raw HTML content

func (Goose) ExtractFromURL 

func (g Goose) ExtractFromURL(url string) (*Article, error)

ExtractFromURL follows the URL, fetches the HTML page and returns an article object

type Parser 

type Parser struct{}

Parser is an HTML parser specialised in extraction of main content and other properties

func NewParser 

func NewParser() *Parser

NewParser returns an HTML parser

type StopWords 

type StopWords struct {
	// contains filtered or unexported fields
}

StopWords implements a simple language detector

func NewStopwords 

func NewStopwords() StopWords

NewStopwords returns an instance of a stop words detector

func (StopWords) SimpleLanguageDetector 

func (stop StopWords) SimpleLanguageDetector(text string) string

SimpleLanguageDetector returns the language code for the text, based on its stop words

type VideoExtractor 

type VideoExtractor struct {
	// contains filtered or unexported fields
}

VideoExtractor can extract the main video from an HTML page

func NewVideoExtractor 

func NewVideoExtractor() VideoExtractor

NewVideoExtractor returns a new instance of a HTML video extractor

func (*VideoExtractor) GetVideos 

func (ve *VideoExtractor) GetVideos(doc *goquery.Document) *set.Set

GetVideos returns the video tags embedded in the article

Source Files

View all Source files

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