Get url preview

preview.go

package main

import (
	"fmt"
	"log"
	"os"
	"net/http"
	"strings"
	"io/ioutil"
	"github.com/gin-gonic/gin"
	"github.com/dyatlov/go-opengraph/opengraph"
)

type Preview struct {
	Url			    string	`json:"url"`
	Title		    string	`json:"title"`
	Description	string	`json:"description"`
	Images		  []*opengraph.Image	`json:"images"`
}

func getPreview_v2(c *gin.Context) {
	htmlURL := c.Query("url")
	resp, err := http.Get(htmlURL)

	if err != nil {
		fmt.Println(err)
		return
	} else {
		defer resp.Body.Close()
		html, err := ioutil.ReadAll(resp.Body)
		if err != nil {
			fmt.Println(err)
			panic(err)
		}

		og := opengraph.NewOpenGraph()
		ogErr := og.ProcessHTML(strings.NewReader(fmt.Sprintf("%s", html)))

		if ogErr != nil {
			fmt.Println(ogErr)
			return
		} else {
			preview := Preview{Url: og.URL, Title:og.Title, Description:og.Description, Images:og.Images}
			c.JSON(http.StatusOK, gin.H{"status" : http.StatusOK, "data" : preview})
		}
	}
}

func main() {
	port := os.Getenv("PORT")
	if port == "" {
		log.Fatal("$PORT must be set")
	}

	router := gin.New()
	router.Use(gin.Logger())
	router.GET("/", getPreview_v2)
	router.Run(":" + port)
}