116 lines
2.6 KiB
Go
116 lines
2.6 KiB
Go
package web
|
|
|
|
import (
|
|
"net/http"
|
|
"strconv"
|
|
|
|
"github.com/PuerkitoBio/goquery"
|
|
)
|
|
|
|
var bingURL = urlMustParse("https://www.bing.com/search?count=10")
|
|
|
|
// Bing represents the Bing search engine
|
|
type Bing struct {
|
|
keyword string
|
|
userAgent string
|
|
first int
|
|
doc *goquery.Document
|
|
initDone bool
|
|
baseSel *goquery.Selection
|
|
}
|
|
|
|
// SetKeyword sets the keyword for searching
|
|
func (b *Bing) SetKeyword(keyword string) {
|
|
b.keyword = keyword
|
|
}
|
|
|
|
// SetPage sets the page number for searching
|
|
func (b *Bing) SetPage(page int) {
|
|
b.first = page * 10
|
|
}
|
|
|
|
// SetUserAgent sets the user agent to use for the request
|
|
func (b *Bing) SetUserAgent(ua string) {
|
|
b.userAgent = ua
|
|
}
|
|
|
|
// Init runs requests for Bing search engine
|
|
func (b *Bing) Init() error {
|
|
// Copy URL so it can be changed
|
|
initURL := copyURL(bingURL)
|
|
query := initURL.Query()
|
|
// Set query
|
|
query.Set("q", b.keyword)
|
|
if b.first > 0 {
|
|
query.Set("first", strconv.Itoa(b.first))
|
|
} else {
|
|
query.Set("first", "1")
|
|
}
|
|
// Update URL query parameters
|
|
initURL.RawQuery = query.Encode()
|
|
|
|
// Create new request for modified URL
|
|
req, err := http.NewRequest(
|
|
http.MethodGet,
|
|
initURL.String(),
|
|
nil,
|
|
)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// If no user agent, use default
|
|
if b.userAgent == "" {
|
|
b.userAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36"
|
|
}
|
|
// Set request user agent
|
|
req.Header.Set("User-Agent", b.userAgent)
|
|
|
|
// Perform request
|
|
res, err := http.DefaultClient.Do(req)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer res.Body.Close()
|
|
|
|
// Create new goquery document
|
|
doc, err := goquery.NewDocumentFromReader(res.Body)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
b.doc = doc
|
|
b.baseSel = doc.Find(`#b_results > li`)
|
|
b.initDone = true
|
|
return nil
|
|
}
|
|
|
|
// Each runs eachCb with the index of each search result
|
|
func (b *Bing) Each(eachCb func(int) error) error {
|
|
for i := 0; i < b.baseSel.Length(); i++ {
|
|
err := eachCb(i)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Title returns the title of the search result corresponding to i
|
|
func (b *Bing) Title(i int) (string, error) {
|
|
return get(b.baseSel, i).ChildrenFiltered("h2").Children().First().Text(), nil
|
|
}
|
|
|
|
// Link returns the link to the search result corresponding to i
|
|
func (b *Bing) Link(i int) (string, error) {
|
|
return get(b.baseSel, i).ChildrenFiltered("h2").Children().First().AttrOr("href", ""), nil
|
|
}
|
|
|
|
// Desc returns the description of the search result corresponding to i
|
|
func (b *Bing) Desc(i int) (string, error) {
|
|
return get(b.baseSel, i).ChildrenFiltered(".b_caption").Children().Last().Text(), nil
|
|
}
|
|
|
|
// Name returns "bing"
|
|
func (b *Bing) Name() string {
|
|
return "bing"
|
|
}
|