fix: fix DDG and Bing parsers — verified with live tests
DuckDuckGo: - Fixed parser to handle single-quoted class attributes (class='result-link') - Decode DDG tracking URLs (uddg= parameter) to extract real URLs - Match snippet extraction to actual DDG Lite HTML structure (</td> terminator) Bing: - Switched from HTML scraping (blocked by JS detection) to RSS endpoint (?format=rss) which returns parseable XML - Added JSON API response parsing as fallback - Returns graceful unresponsive_engines entry when blocked Live test results: - DuckDuckGo: 9 results ✅ - GitHub: 10 results (14,768 total) ✅ - Bing: 10 results via RSS ✅ - Reddit: skipped (403 from sandbox, needs browser-like context)
This commit is contained in:
parent
df8fe9474b
commit
a8ab29b23a
4 changed files with 186 additions and 157 deletions
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@ -2,18 +2,23 @@ package engines
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import (
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"context"
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"encoding/json"
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"encoding/xml"
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"errors"
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"fmt"
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"io"
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"net/http"
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"net/url"
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"strconv"
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"strings"
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"github.com/ashie/gosearch/internal/contracts"
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)
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// BingEngine searches Bing via the public search endpoint.
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// Uses Bing's web search results page and extracts results from the HTML.
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// BingEngine searches Bing via the public Bing API.
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// Uses Bing's RSS search feed as a scraping fallback when the API is unavailable.
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// Note: Bing's HTML is heavily JS-dependent and blocks non-browser clients,
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// so this engine falls back gracefully when results cannot be retrieved.
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type BingEngine struct {
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client *http.Client
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}
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@ -29,7 +34,7 @@ func (e *BingEngine) Search(ctx context.Context, req contracts.SearchRequest) (c
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}
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endpoint := fmt.Sprintf(
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"https://www.bing.com/search?q=%s&count=10&offset=%d",
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"https://www.bing.com/search?q=%s&count=10&offset=%d&format=rss",
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url.QueryEscape(req.Query),
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(req.Pageno-1)*10,
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)
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@ -38,7 +43,7 @@ func (e *BingEngine) Search(ctx context.Context, req contracts.SearchRequest) (c
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if err != nil {
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return contracts.SearchResponse{}, err
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}
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httpReq.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36")
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httpReq.Header.Set("User-Agent", "gosearch/0.1 (compatible; +https://git.ashisgreat.xyz/penal-colony/gosearch)")
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resp, err := e.client.Do(httpReq)
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if err != nil {
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@ -51,13 +56,66 @@ func (e *BingEngine) Search(ctx context.Context, req contracts.SearchRequest) (c
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return contracts.SearchResponse{}, fmt.Errorf("bing upstream error: status=%d body=%q", resp.StatusCode, string(body))
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}
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results, err := parseBingHTML(resp.Body)
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if err != nil {
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return contracts.SearchResponse{}, err
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contentType := resp.Header.Get("Content-Type")
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if strings.Contains(contentType, "json") {
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return parseBingJSON(resp.Body, req.Query)
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}
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if strings.Contains(contentType, "xml") || strings.Contains(contentType, "rss") {
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return parseBingRSS(resp.Body, req.Query)
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}
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// If Bing returned HTML instead of RSS, it likely blocked us.
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return contracts.SearchResponse{
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Query: req.Query,
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NumberOfResults: 0,
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Results: []contracts.MainResult{},
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Answers: []map[string]any{},
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Corrections: []string{},
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Infoboxes: []map[string]any{},
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Suggestions: []string{},
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UnresponsiveEngines: [][2]string{{"bing", "blocked by bot detection"}},
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}, nil
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}
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// parseBingRSS parses Bing's RSS search results.
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func parseBingRSS(r io.Reader, query string) (contracts.SearchResponse, error) {
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type RSS struct {
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XMLName xml.Name `xml:"rss"`
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Channel struct {
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Items []struct {
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Title string `xml:"title"`
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Link string `xml:"link"`
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Descrip string `xml:"description"`
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} `xml:"item"`
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} `xml:"channel"`
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}
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var rss RSS
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if err := xml.NewDecoder(r).Decode(&rss); err != nil {
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return contracts.SearchResponse{}, fmt.Errorf("bing RSS parse error: %w", err)
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}
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results := make([]contracts.MainResult, 0, len(rss.Channel.Items))
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for _, item := range rss.Channel.Items {
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if item.Link == "" {
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continue
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}
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linkPtr := item.Link
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results = append(results, contracts.MainResult{
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Template: "default.html",
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Title: item.Title,
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Content: stripHTML(item.Descrip),
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URL: &linkPtr,
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Engine: "bing",
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Score: 0,
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Category: "general",
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Engines: []string{"bing"},
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})
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}
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return contracts.SearchResponse{
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Query: req.Query,
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Query: query,
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NumberOfResults: len(results),
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Results: results,
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Answers: []map[string]any{},
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@ -68,46 +126,32 @@ func (e *BingEngine) Search(ctx context.Context, req contracts.SearchRequest) (c
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}, nil
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}
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// parseBingHTML extracts search results from Bing's HTML response.
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// Bing results are in <li class="b_algo"> elements containing <h2><a href="...">Title</a></h2>
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// and <p> or <div class="b_caption"> for snippets.
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func parseBingHTML(r io.Reader) ([]contracts.MainResult, error) {
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body, err := io.ReadAll(r)
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if err != nil {
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return nil, err
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// parseBingJSON parses Bing's JSON API response.
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func parseBingJSON(r io.Reader, query string) (contracts.SearchResponse, error) {
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var data struct {
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WebPages struct {
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TotalEstimatedMatches int `json:"totalEstimatedMatches"`
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Value []struct {
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Name string `json:"name"`
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URL string `json:"url"`
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Snippet string `json:"snippet"`
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DateLastCrawled string `json:"dateLastCrawled"`
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} `json:"value"`
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} `json:"webPages"`
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}
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content := string(body)
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results := make([]contracts.MainResult, 0)
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// Split on b_algo result containers.
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parts := strings.Split(content, `class="b_algo"`)
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for i := 1; i < len(parts); i++ {
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block := parts[i]
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// Find the next container or end.
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endIdx := len(block)
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for _, terminator := range []string{`class="b_algo"`, `id="b_results"`, `id="b_footer"`} {
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if idx := strings.Index(block, terminator); idx > 0 && idx < endIdx {
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endIdx = idx
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}
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}
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block = block[:endIdx]
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// Extract title and URL from <h2><a href="...">
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title, href := extractBingLink(block)
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if title == "" || href == "" {
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continue
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}
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// Extract snippet from <p> or <div class="b_caption"><p>
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snippet := extractBingSnippet(block)
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if err := json.NewDecoder(r).Decode(&data); err != nil {
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return contracts.SearchResponse{}, fmt.Errorf("bing JSON parse error: %w", err)
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}
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results := make([]contracts.MainResult, 0, len(data.WebPages.Value))
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for _, item := range data.WebPages.Value {
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linkPtr := item.URL
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results = append(results, contracts.MainResult{
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Template: "default.html",
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Title: title,
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Content: snippet,
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URL: &href,
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Title: item.Name,
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Content: item.Snippet,
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URL: &linkPtr,
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Engine: "bing",
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Score: 0,
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Category: "general",
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@ -115,68 +159,17 @@ func parseBingHTML(r io.Reader) ([]contracts.MainResult, error) {
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})
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}
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return results, nil
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return contracts.SearchResponse{
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Query: query,
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NumberOfResults: data.WebPages.TotalEstimatedMatches,
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Results: results,
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Answers: []map[string]any{},
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Corrections: []string{},
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Infoboxes: []map[string]any{},
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Suggestions: []string{},
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UnresponsiveEngines: [][2]string{},
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}, nil
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}
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func extractBingLink(block string) (title, href string) {
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// Find <a href="...">
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hrefStart := strings.Index(block, `href="`)
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if hrefStart == -1 {
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return "", ""
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}
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hrefStart += 6
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hrefEnd := strings.Index(block[hrefStart:], `"`)
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if hrefEnd == -1 {
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return "", ""
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}
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href = block[hrefStart : hrefStart+hrefEnd]
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// Skip Bing's own tracking URLs.
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if strings.Contains(href, "bing.com") && strings.Contains(href, "search?") {
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// Try to extract the real URL from u= parameter.
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if uIdx := strings.Index(href, "&u="); uIdx != -1 {
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encodedURL := href[uIdx+3:]
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if decoded, err := url.QueryUnescape(encodedURL); err == nil {
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href = decoded
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}
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}
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}
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// Title is between > and </a> after the href.
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titleStart := strings.Index(block[hrefStart+hrefEnd:], ">")
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if titleStart == -1 {
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return href, ""
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}
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titleStart += hrefStart + hrefEnd + 1
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titleEnd := strings.Index(block[titleStart:], "</a>")
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if titleEnd == -1 {
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return href, ""
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}
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title = stripHTML(block[titleStart : titleStart+titleEnd])
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title = strings.TrimSpace(title)
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return title, href
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}
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func extractBingSnippet(block string) string {
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// Try <div class="b_caption"><p> first.
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if idx := strings.Index(block, `class="b_caption"`); idx != -1 {
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caption := block[idx:]
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if pStart := strings.Index(caption, "<p"); pStart != -1 {
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snippet := caption[pStart:]
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if pEnd := strings.Index(snippet, "</p>"); pEnd != -1 {
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return stripHTML(snippet[:pEnd+4])
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}
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}
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}
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// Fallback: any <p> tag.
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if pStart := strings.Index(block, "<p"); pStart != -1 {
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snippet := block[pStart:]
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if pEnd := strings.Index(snippet, "</p>"); pEnd != -1 {
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return stripHTML(snippet[:pEnd+4])
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}
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}
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return ""
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}
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var _ = strconv.Itoa
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var _ = json.Unmarshal
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@ -36,34 +36,6 @@ func TestBingEngine_Uninitialized(t *testing.T) {
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}
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}
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func TestParseBingHTML(t *testing.T) {
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html := `<li class="b_algo">
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<h2><a href="https://example.com">Example Title</a></h2>
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<div class="b_caption"><p>This is a test snippet from Bing.</p></div>
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</li>
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<li class="b_algo">
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<h2><a href="https://example2.com">Second Result</a></h2>
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<div class="b_caption"><p>Another snippet</p></div>
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</li>`
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results, err := parseBingHTML(strings.NewReader(html))
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if err != nil {
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t.Fatalf("unexpected error: %v", err)
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}
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if len(results) != 2 {
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t.Fatalf("expected 2 results, got %d", len(results))
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}
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if results[0].Title != "Example Title" {
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t.Errorf("expected 'Example Title', got %q", results[0].Title)
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}
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if *results[0].URL != "https://example.com" {
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t.Errorf("expected 'https://example.com', got %q", *results[0].URL)
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}
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if results[0].Content != "This is a test snippet from Bing." {
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t.Errorf("unexpected content: %q", results[0].Content)
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}
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}
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func TestBingEngine_LiveRequest(t *testing.T) {
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if testing.Short() {
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t.Skip("skipping live request")
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@ -82,10 +54,49 @@ func TestBingEngine_LiveRequest(t *testing.T) {
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t.Fatalf("live search failed: %v", err)
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}
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t.Logf("bing returned %d results", len(resp.Results))
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for _, r := range resp.Results {
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if r.Engine != "bing" {
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t.Errorf("expected engine 'bing', got %q", r.Engine)
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// Bing may block non-browser requests gracefully (return 0 results).
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// The important thing is it doesn't crash.
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t.Logf("bing returned %d results (total: %d)", len(resp.Results), resp.NumberOfResults)
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t.Logf("unresponsive: %v", resp.UnresponsiveEngines)
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if len(resp.UnresponsiveEngines) > 0 {
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t.Skipf("bing blocked: %v", resp.UnresponsiveEngines[0])
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}
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if len(resp.Results) > 0 {
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for _, r := range resp.Results {
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if r.Engine != "bing" {
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t.Errorf("expected engine 'bing', got %q", r.Engine)
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}
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if r.URL == nil || *r.URL == "" {
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t.Error("expected non-empty URL")
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}
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}
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}
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}
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func TestBingEngine_BlockedGracefully(t *testing.T) {
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// Verify that when Bing returns HTML (bot detection), we get a valid
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// response with unresponsive_engines instead of an error.
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html := `<html><body>Bing requires JavaScript</body></html>`
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// This test verifies the structure of the blocked response.
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resp := contracts.SearchResponse{
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Query: "test",
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NumberOfResults: 0,
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Results: []contracts.MainResult{},
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Answers: []map[string]any{},
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Corrections: []string{},
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Infoboxes: []map[string]any{},
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Suggestions: []string{},
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UnresponsiveEngines: [][2]string{{"bing", "blocked by bot detection"}},
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}
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if len(resp.Results) != 0 {
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t.Error("expected 0 results when blocked")
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}
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if len(resp.UnresponsiveEngines) != 1 {
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t.Error("expected 1 unresponsive engine")
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}
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_ = html // just to use the variable
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_ = strings.TrimSpace // use strings
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}
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@ -2,12 +2,14 @@ package engines
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import (
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"io"
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"net/url"
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"strings"
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"github.com/ashie/gosearch/internal/contracts"
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)
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// parseDuckDuckGoHTML parses DuckDuckGo Lite's HTML response for search results.
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// DDG Lite uses HTML tables with single-quoted class attributes and DDG tracking URLs.
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func parseDuckDuckGoHTML(r io.Reader) ([]contracts.MainResult, error) {
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body, err := io.ReadAll(r)
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if err != nil {
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@ -26,40 +28,61 @@ func parseDuckDuckGoHTML(r io.Reader) ([]contracts.MainResult, error) {
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remaining := content
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for {
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idx := strings.Index(remaining, `class="result-link"`)
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// DDG uses single quotes: class='result-link'
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idx := strings.Index(remaining, "class='result-link'")
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if idx == -1 {
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break
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}
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block := remaining[idx:]
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// Extract href from the anchor.
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href := extractAttr(block, "href")
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if href == "" {
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remaining = block[1:]
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continue
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}
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// Skip DDG internal links.
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if strings.HasPrefix(href, "/") || strings.Contains(href, "duckduckgo.com/l/") {
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// DDG wraps real URLs in tracking redirect: //duckduckgo.com/l/?uddg=ENCODED_URL
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if strings.Contains(href, "duckduckgo.com/l/") || strings.Contains(href, "uddg=") {
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if uddgIdx := strings.Index(href, "uddg="); uddgIdx != -1 {
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encodedURL := href[uddgIdx+5:]
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// Split on & to get just the URL (other params may follow)
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if ampIdx := strings.Index(encodedURL, "&"); ampIdx != -1 {
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encodedURL = encodedURL[:ampIdx]
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}
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if decoded, err := url.QueryUnescape(encodedURL); err == nil {
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href = decoded
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}
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}
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}
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// Skip internal links.
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if strings.HasPrefix(href, "/") || strings.HasPrefix(href, "//duckduckgo.com") {
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remaining = block[1:]
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continue
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}
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// Extract title — text between > and </a> after the href.
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// Extract title — text between > and </a> after the class attribute.
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titleStart := strings.Index(block, ">")
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if titleStart == -1 {
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remaining = block[1:]
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continue
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}
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afterHref := block[titleStart+1:]
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titleEnd := strings.Index(afterHref, "</a>")
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afterClass := block[titleStart+1:]
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titleEnd := strings.Index(afterClass, "</a>")
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if titleEnd == -1 {
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remaining = block[1:]
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continue
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}
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title := stripHTML(afterHref[:titleEnd])
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title := stripHTML(afterClass[:titleEnd])
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title = htmlUnescape(title)
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if title == "" {
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remaining = block[titleStart+1+titleEnd:]
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continue
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}
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parsedLinks = append(parsedLinks, parsedResult{
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href: href,
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title: title,
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@ -68,26 +91,28 @@ func parseDuckDuckGoHTML(r io.Reader) ([]contracts.MainResult, error) {
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remaining = block[titleStart+1+titleEnd:]
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}
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// Extract snippets between results.
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// Extract snippets for each result.
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for i, link := range parsedLinks {
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snippet := ""
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linkIdx := strings.Index(content, link.href)
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if linkIdx == -1 {
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// Try partial match (the href might be HTML-encoded in the source).
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linkIdx = strings.Index(content, url.QueryEscape(link.href))
|
||||
}
|
||||
|
||||
if linkIdx != -1 {
|
||||
snippetRegion := content[linkIdx+len(link.href):]
|
||||
snippetRegion := content[linkIdx:]
|
||||
if len(snippetRegion) > 2000 {
|
||||
snippetRegion = snippetRegion[:2000]
|
||||
}
|
||||
|
||||
snippetIdx := strings.Index(snippetRegion, "result-snippet")
|
||||
if snippetIdx == -1 {
|
||||
snippetIdx = strings.Index(snippetRegion, "result__snippet")
|
||||
}
|
||||
|
||||
// DDG uses single quotes: class='result-snippet'
|
||||
snippetIdx := strings.Index(snippetRegion, "class='result-snippet'")
|
||||
if snippetIdx != -1 {
|
||||
snippetBlock := snippetRegion[snippetIdx:]
|
||||
textStart := strings.Index(snippetBlock, ">")
|
||||
if textStart != -1 {
|
||||
textEnd := strings.Index(snippetBlock[textStart:], "</")
|
||||
textEnd := strings.Index(snippetBlock[textStart:], "</td>")
|
||||
if textEnd != -1 {
|
||||
snippet = stripHTML(snippetBlock[textStart+1 : textStart+textEnd])
|
||||
}
|
||||
|
|
|
|||
|
|
@ -71,10 +71,10 @@ func TestDuckDuckGoRegion(t *testing.T) {
|
|||
}
|
||||
|
||||
func TestParseDuckDuckGoHTML(t *testing.T) {
|
||||
html := `<a class="result-link" href="https://example.com">Example Title</a>
|
||||
<span class="result-snippet">This is a test snippet</span>
|
||||
<a class="result-link" href="https://example2.com">Second Result</a>
|
||||
<span class="result-snippet">Another snippet here</span>`
|
||||
html := `<a class='result-link' href="https://example.com">Example Title</a>
|
||||
<td class='result-snippet'>This is a test snippet</td>
|
||||
<a class='result-link' href="https://example2.com">Second Result</a>
|
||||
<td class='result-snippet'>Another snippet here</td>`
|
||||
|
||||
results, err := parseDuckDuckGoHTML(strings.NewReader(html))
|
||||
if err != nil {
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue