Added: fetching polish articles

internal/wikipediadl/fetcharticles.go

@@ -0,0 +1,71 @@
+package wikipediadl
+
+import (
+	"fmt"
+	"log"
+	"strings"
+
+	"github.com/gocolly/colly"
+)
+
+const (
+	DumpDomain = "dumps.wikimedia.org"
+	DumpUrl    = "https://dumps.wikimedia.org/plwiki/latest/"
+)
+
+func getScraper() *colly.Collector {
+	s := colly.NewCollector(
+		colly.AllowedDomains(DumpDomain),
+	)
+
+	return s
+}
+
+func getAllArticles(s *colly.Collector) []string {
+	articles := []string{}
+
+	s.OnHTML("a", func(h *colly.HTMLElement) {
+		article := h.Attr("href")
+		if !isValidArticle(article) {
+			return
+		}
+
+		articles = append(articles, h.Attr("href"))
+
+	})
+
+	s.OnError(func(r *colly.Response, err error) {
+		log.Println(r.Request.URL)
+	})
+
+	s.Visit(DumpUrl)
+
+	return articles
+}
+
+func isValidArticle(a string) bool {
+	const (
+		validPrefix = "plwiki-latest-pages-articles"
+		validSuffix = ".bz2"
+	)
+
+	if !strings.HasPrefix(a, validPrefix) || !strings.HasSuffix(a, validSuffix) {
+		return false
+	}
+
+	article, _ := strings.CutPrefix(a, validPrefix)
+
+	articleIndex := article[0]
+	return articleIndex >= 48 && articleIndex <= 57
+}
+
+func FetchArticles() error {
+	scraper := getScraper()
+
+	articles := getAllArticles(scraper)
+	for _, a := range articles {
+		fmt.Println(a)
+	}
+
+	return nil
+}