feat: add article page

handlers/article.go

@@ -0,0 +1,68 @@
+package handlers
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+
+	"github.com/PuerkitoBio/goquery"
+	"github.com/gorilla/mux"
+	"github.com/rramiachraf/dumb/data"
+	"github.com/rramiachraf/dumb/utils"
+	"github.com/rramiachraf/dumb/views"
+)
+
+func article(l *utils.Logger) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		articleSlug := mux.Vars(r)["article"]
+
+		if a, err := getCache[data.Article](articleSlug); err == nil {
+			views.ArticlePage(a).Render(context.Background(), w)
+			return
+		}
+
+		url := fmt.Sprintf("https://genius.com/a/%s", articleSlug)
+
+		resp, err := utils.SendRequest(url)
+		if err != nil {
+			l.Error(err.Error())
+			w.WriteHeader(http.StatusInternalServerError)
+			views.ErrorPage(500, "cannot reach Genius servers").Render(context.Background(), w)
+			return
+		}
+
+		defer resp.Body.Close()
+
+		if resp.StatusCode == http.StatusNotFound {
+			w.WriteHeader(http.StatusNotFound)
+			views.ErrorPage(404, "page not found").Render(context.Background(), w)
+			return
+		}
+
+		doc, err := goquery.NewDocumentFromReader(resp.Body)
+		if err != nil {
+			l.Error(err.Error())
+			w.WriteHeader(http.StatusInternalServerError)
+			views.ErrorPage(500, "something went wrong").Render(context.Background(), w)
+			return
+		}
+
+		cf := doc.Find(".cloudflare_content").Length()
+		if cf > 0 {
+			l.Error("cloudflare got in the way")
+			views.ErrorPage(500, "cloudflare is detected").Render(context.Background(), w)
+			return
+		}
+
+		var a data.Article
+		if err = a.Parse(doc); err != nil {
+			l.Error(err.Error())
+		}
+
+		views.ArticlePage(a).Render(context.Background(), w)
+
+		if err = setCache(articleSlug, a); err != nil {
+			l.Error(err.Error())
+		}
+	}
+}