refactor: dedupe html fetch

pkg/net/document.go

@@ -0,0 +1,49 @@
+package netutil
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"net/http"
+
+	"github.com/PuerkitoBio/goquery"
+)
+
+func FetchHTMLDocument(
+	ctx context.Context,
+	httpClient *http.Client,
+	url string,
+	prepareRequest func(*http.Request),
+	buildStatusError func(*http.Response, []byte) error,
+) (*goquery.Document, *http.Response, error) {
+	client := httpClient
+	if client == nil {
+		client = http.DefaultClient
+	}
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return nil, nil, fmt.Errorf("failed to create request: %w", err)
+	}
+	if prepareRequest != nil {
+		prepareRequest(request)
+	}
+
+	response, err := client.Do(request)
+	if err != nil {
+		return nil, nil, fmt.Errorf("request failed: %w", err)
+	}
+	defer func() { _ = response.Body.Close() }()
+
+	if response.StatusCode != http.StatusOK {
+		body, _ := io.ReadAll(io.LimitReader(response.Body, Bytes512))
+		return nil, response, buildStatusError(response, body)
+	}
+
+	document, err := goquery.NewDocumentFromReader(response.Body)
+	if err != nil {
+		return nil, response, fmt.Errorf("failed to parse html: %w", err)
+	}
+
+	return document, response, nil
+}