Initial commit

internal/anekdotru/anekdotru.go

@@ -0,0 +1,77 @@
+package anekdotru
+
+import (
+	"aleesa-webapp-go/internal/config"
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"math/rand/v2"
+	"regexp"
+
+	"github.com/carlmjohnson/requests"
+)
+
+func APIClient(cfg *config.MyConfig) (string, error) {
+	var (
+		ctx       = context.Background()
+		respBody  bytes.Buffer
+		respBytes []byte
+		userAgent = cfg.UserAgents[rand.IntN(len(cfg.UserAgents))]
+		url       = "https://www.anekdot.ru/rss/randomu.html"
+	)
+
+	err := requests.
+		URL(url).
+		UserAgent(userAgent).
+		ToBytesBuffer(&respBody).
+		Fetch(ctx)
+
+	if err != nil {
+		return "", fmt.Errorf("unable to GET %s: %w", url, err)
+	}
+
+	// Time to fix UTF-8, just in case.
+	respBytes = bytes.ToValidUTF8(respBody.Bytes(), []byte{0xef, 0xbf, 0xbd})
+
+	// Cut-off json.
+	re := regexp.MustCompile(`JSON.parse\('`)
+	aneks := re.Split(string(respBytes), 2)
+
+	if (len(aneks) >= 2) && (aneks[1] != "") {
+		re = regexp.MustCompile(`'\);`)
+		a := re.Split(aneks[1], 2)
+
+		if (len(a) >= 2) && (a[0] != "") {
+			anek := []byte(a[0])
+
+			re = regexp.MustCompile(`\\"`)
+			anek = re.ReplaceAll(anek, []byte(`"`))
+
+			re = regexp.MustCompile(`\\"`)
+			anekJSON := re.ReplaceAll(anek, []byte(`"`))
+			anekJSON = bytes.ToValidUTF8(anekJSON, []byte{0xef, 0xbf, 0xbd})
+
+			var anekMap []string
+			if err := json.Unmarshal(anekJSON, &anekMap); err != nil {
+				return fmt.Sprintf("RespBytes:%s\n\nAnekJSON: %s", respBytes, string(anekJSON)), err
+			}
+
+			re = regexp.MustCompile(`<br>`)
+			answer := re.ReplaceAll([]byte(anekMap[0]), []byte("\n"))
+
+			return string(answer), nil
+		}
+
+		fmt.Printf("a length: %d\nvalue: %v", len(a), a)
+	} else {
+		fmt.Printf("aneks length: %d\nvalue: %v", len(aneks), aneks)
+	}
+
+	err = errors.New("Unable to parse response from www.anekdot.ru: " + string(respBytes))
+
+	return "", err
+}
+
+/* vim: set ft=go noet ai ts=4 sw=4 sts=4: */