94 lines
2.4 KiB
Go
94 lines
2.4 KiB
Go
package search
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import (
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"fmt"
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"io"
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"net/url"
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"regexp"
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"strings"
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"github.com/PuerkitoBio/goquery"
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)
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var commentRE = regexp.MustCompile(`(?s)<!--(.*?)-->`)
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func searchAnnasArchive(query string) ([]SearchItem, error) {
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searchURL := "https://annas-archive.org/search?index=&q=%s&ext=epub&sort=&lang=en"
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url := fmt.Sprintf(searchURL, url.QueryEscape(query))
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body, err := getPage(url)
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if err != nil {
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return nil, err
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}
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return parseAnnasArchive(body)
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}
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func parseAnnasArchive(body io.ReadCloser) ([]SearchItem, error) {
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// Parse
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defer body.Close()
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doc, err := goquery.NewDocumentFromReader(body)
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if err != nil {
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return nil, err
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}
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// Normalize Results
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var allEntries []SearchItem
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doc.Find("#aarecord-list > div.justify-center").Each(func(ix int, rawBook *goquery.Selection) {
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rawBook = getAnnasArchiveBookSelection(rawBook)
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// Parse Details
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details := rawBook.Find("div:nth-child(2) > div:nth-child(1)").Text()
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detailsSplit := strings.Split(details, ", ")
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// Invalid Details
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if len(detailsSplit) < 4 {
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return
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}
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// Parse MD5
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itemHref, _ := rawBook.Find("a").Attr("href")
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hrefArray := strings.Split(itemHref, "/")
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id := hrefArray[len(hrefArray)-1]
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allEntries = append(allEntries, SearchItem{
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ID: id,
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Title: rawBook.Find("h3").First().Text(),
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Author: rawBook.Find("div:nth-child(2) > div:nth-child(4)").First().Text(),
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Language: detailsSplit[0],
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FileType: detailsSplit[1],
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FileSize: detailsSplit[3],
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})
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})
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// Return Results
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return allEntries, nil
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}
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// getAnnasArchiveBookSelection parses potentially commented out HTML. For some reason
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// Annas Archive comments out blocks "below the fold". They aren't rendered until you
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// scroll. This attempts to parse the commented out HTML.
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func getAnnasArchiveBookSelection(rawBook *goquery.Selection) *goquery.Selection {
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rawHTML, err := rawBook.Html()
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if err != nil {
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return rawBook
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}
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strippedHTML := strings.TrimSpace(rawHTML)
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if !strings.HasPrefix(strippedHTML, "<!--") || !strings.HasSuffix(strippedHTML, "-->") {
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return rawBook
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}
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allMatches := commentRE.FindAllStringSubmatch(strippedHTML, -1)
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if len(allMatches) != 1 || len(allMatches[0]) != 2 {
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return rawBook
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}
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captureGroup := allMatches[0][1]
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docReader := strings.NewReader(captureGroup)
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doc, err := goquery.NewDocumentFromReader(docReader)
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if err != nil {
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return rawBook
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}
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return doc.Selection
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}
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