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|
package handler
import (
"crypto/md5"
"encoding/base64"
"encoding/json"
"fmt"
"image"
"log"
"net/http"
"os"
"path/filepath"
"strconv"
"strings"
"github.com/go-redis/redis/v8"
"github.com/joho/godotenv"
"github.com/lucasb-eyer/go-colorful"
"github.com/nfnt/resize"
"github.com/disintegration/imaging"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/mongo"
"go.mongodb.org/mongo-driver/mongo/options"
"golang.org/x/net/context"
"golang.org/x/image/webp"
)
var redisClient *redis.Client
var mongoClient *mongo.Client
var cacheEnabled bool
var useMongoDB bool
var redisDB int
var mongoDB string
var ctx = context.Background()
var colorsCollection *mongo.Collection
func init() {
currentDir, err := os.Getwd()
if err != nil {
fmt.Printf("获取当前工作目录路径时出错：%v\n", err)
return
}
envFile := filepath.Join(currentDir, ".env")
err = godotenv.Load(envFile)
if err != nil {
fmt.Printf("加载 .env 文件时出错：%v\n", err)
return
}
redisAddr := os.Getenv("REDIS_ADDRESS")
redisPassword := os.Getenv("REDIS_PASSWORD")
cacheEnabledStr := os.Getenv("USE_REDIS_CACHE")
redisDBStr := os.Getenv("REDIS_DB")
mongoDB = os.Getenv("MONGO_DB")
mongoURI := os.Getenv("MONGO_URI")
redisDB, err = strconv.Atoi(redisDBStr)
if err != nil {
redisDB = 0
}
redisClient = redis.NewClient(&redis.Options{
Addr: redisAddr,
Password: redisPassword,
DB: redisDB,
})
cacheEnabled = cacheEnabledStr == "true"
useMongoDBStr := os.Getenv("USE_MONGODB")
useMongoDB = useMongoDBStr == "true"
if useMongoDB {
log.Println("连接到MongoDB...")
clientOptions := options.Client().ApplyURI(mongoURI)
mongoClient, err = mongo.Connect(ctx, clientOptions)
if err != nil {
log.Fatalf("连接到MongoDB时出错：%v", err)
}
log.Println("已连接到MongoDB！")
colorsCollection = mongoClient.Database(mongoDB).Collection("colors")
}
}
func calculateMD5Hash(data []byte) string {
hash := md5.Sum(data)
return base64.StdEncoding.EncodeToString(hash[:])
}
func extractMainColor(imgURL string) (string, error) {
md5Hash := calculateMD5Hash([]byte(imgURL))
if cacheEnabled && redisClient != nil {
cachedColor, err := redisClient.Get(ctx, md5Hash).Result()
if err == nil && cachedColor != "" {
return cachedColor, nil
}
}
req, err := http.NewRequest("GET", imgURL, nil)
if err != nil {
return "", err
}
req.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36 Edg/115.0.1901.253")
client := http.DefaultClient
resp, err := client.Do(req)
if err != nil {
return "", err
}
defer resp.Body.Close()
contentType := resp.Header.Get("Content-Type")
var img image.Image
switch contentType {
case "image/webp":
img, err = webp.Decode(resp.Body)
if err != nil {
return "", fmt.Errorf("解码 WebP 图片时出错: %v", err)
}
default:
img, err = imaging.Decode(resp.Body)
if err != nil {
return "", fmt.Errorf("解码图片时出错: %v", err)
}
}
img = resize.Resize(50, 0, img, resize.Lanczos3)
bounds := img.Bounds()
var r, g, b uint32
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
for x := bounds.Min.X; x < bounds.Max.X; x++ {
c := img.At(x, y)
r0, g0, b0, _ := c.RGBA()
r += r0
g += g0
b += b0
}
}
totalPixels := uint32(bounds.Dx() * bounds.Dy())
averageR := r / totalPixels
averageG := g / totalPixels
averageB := b / totalPixels
mainColor := colorful.Color{R: float64(averageR) / 0xFFFF, G: float64(averageG) / 0xFFFF, B: float64(averageB) / 0xFFFF}
colorHex := mainColor.Hex()
if cacheEnabled && redisClient != nil {
_, err := redisClient.Set(ctx, md5Hash, colorHex, 0).Result()
if err != nil {
log.Printf("将结果存储在缓存中时出错：%v\n", err)
}
}
if useMongoDB && colorsCollection != nil {
_, err := colorsCollection.InsertOne(ctx, bson.M{
"url": imgURL,
"color": colorHex,
})
if err != nil {
log.Printf("将结果存储在MongoDB中时出错：%v\n", err)
}
}
return colorHex, nil
}
func handleImageColor(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Access-Control-Allow-Methods", "GET, OPTIONS")
w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Referer")
if r.Method == http.MethodOptions {
w.WriteHeader(http.StatusOK)
return
}
referer := r.Header.Get("Referer")
if !isRefererAllowed(referer) {
http.Error(w, "禁止访问", http.StatusForbidden)
return
}
imgURL := r.URL.Query().Get("img")
if imgURL == "" {
http.Error(w, "缺少img参数", http.StatusBadRequest)
return
}
color, err := extractMainColor(imgURL)
if err != nil {
http.Error(w, fmt.Sprintf("提取主色调失败：%v", err), http.StatusInternalServerError)
return
}
data := map[string]string{
"RGB": color,
}
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(data)
}
func Handler(w http.ResponseWriter, r *http.Request) {
handleImageColor(w, r)
}
func isRefererAllowed(referer string) bool {
allowedReferer := "https://blog.775866.xyz"
if strings.HasPrefix(referer, allowedReferer) {
return true
}
return false
}
func main() {
http.HandleFunc("/api", Handler)
port := os.Getenv("PORT")
if port == "" {
port = "3000"
}
log.Printf("服务器监听在：%s...\n", port)
err := http.ListenAndServe(":"+port, nil)
if err != nil {
log.Fatalf("启动服务器时出错：%v\n", err)
}
}
|
