Add AOL engine

.gitignore

@@ -1,2 +1,4 @@
 /static/ext/
-/scope
+/scope
+/cmd/test/
+/test

search/web/aol.go

@@ -0,0 +1,144 @@
+package web
+
+import (
+	"net/http"
+	"net/url"
+	"strconv"
+	"strings"
+
+	"github.com/PuerkitoBio/goquery"
+)
+
+var aolURL = urlMustParse("https://search.aol.com/aol/search?rp=&s_chn=prt_bon&s_it=comsearch")
+
+type AOL struct {
+	keyword   string
+	userAgent string
+	page      int
+	doc       *goquery.Document
+	initDone  bool
+	baseSel   *goquery.Selection
+}
+
+// SetKeyword sets the keyword for searching
+func (a *AOL) SetKeyword(keyword string) {
+	a.keyword = keyword
+}
+
+// SetPage sets the page number for searching
+func (a *AOL) SetPage(page int) {
+	a.page = page * 10
+	if a.page > 0 {
+		a.page++
+	}
+}
+
+// SetUserAgent sets the user agent to use for the request
+func (a *AOL) SetUserAgent(ua string) {
+	a.userAgent = ua
+}
+
+// Init runs requests for Bing search engine
+func (a *AOL) Init() error {
+	// Copy URL so it can be changed
+	initURL := copyURL(aolURL)
+	query := initURL.Query()
+	// Set query
+	query.Set("q", a.keyword)
+	if a.page > 0 {
+		query.Set("b", strconv.Itoa(a.page))
+	}
+	// 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 a.userAgent == "" {
+		a.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", a.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
+	}
+	a.doc = doc
+	a.baseSel = doc.Find(`h3.title > a[href]`)
+	a.initDone = true
+	return nil
+}
+
+// Each runs eachCb with the index of each search result
+func (a *AOL) Each(eachCb func(int) error) error {
+	for i := 0; i < a.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 (a *AOL) Title(i int) (string, error) {
+	return get(a.baseSel, i).Text(), nil
+}
+
+// Link returns the link to the search result corresponding to i
+func (a *AOL) Link(i int) (string, error) {
+	href := get(a.baseSel, i).AttrOr("href", "")
+	hrefURL, err := url.Parse(href)
+	if err != nil {
+		return "", err
+	}
+
+	var ru string
+	splitPath := strings.Split(hrefURL.RawPath, "/")
+	for _, item := range splitPath {
+		if strings.HasPrefix(item, "RU=") {
+			ru = strings.TrimPrefix(item, "RU=")
+			break
+		}
+	}
+	if ru == "" {
+		return href, nil
+	}
+
+	return url.PathUnescape(ru)
+}
+
+// Desc returns the description of the search result corresponding to i
+func (a *AOL) Desc(i int) (string, error) {
+	return a.baseSel.
+		First().
+		Parent().
+		Parent().
+		Next().
+		Children().
+		First().
+		Text(), nil
+}
+
+// Name returns "aol"
+func (*AOL) Name() string {
+	return "aol"
+}
+
+// https://search.aol.com/aol/search?q=site%3Alinkedin.com%2Fin%2F+%22Senior+Developer%22+%22Nvidia%22&rp=&s_chn=prt_bon&s_it=comsearch