1 files changed, 132 insertions, 0 deletions
diff --git a/app/cache.go b/app/cache.go
new file mode 100644
index 0000000..dedba83
--- /dev/null
+++ b/app/cache.go
@@ -0,0 +1,132 @@
+// TODO: реализовать кеширование JSON и почистить код
+package app
+
+import (
+	"crypto/sha1"
+	"encoding/hex"
+	"io"
+	"os"
+	"strings"
+	"sync"
+	"syscall"
+	"time"
+)
+
+type file struct {
+	Score   int
+	Content []byte
+}
+
+var tempFS = make(map[[20]byte]*file)
+var mx = &sync.RWMutex{}
+
+func (s skunkyart) DownloadAndSendMedia(subdomain, path string) {
+	var url strings.Builder
+	url.WriteString("https://images-wixmp-")
+	url.WriteString(subdomain)
+	url.WriteString(".wixmp.com/")
+	url.WriteString(path)
+	url.WriteString("?token=")
+	url.WriteString(s.Args.Get("token"))
+
+	var response []byte
+
+	switch {
+	case CFG.Cache.Enabled:
+		fileName := sha1.Sum([]byte(subdomain + path))
+		filePath := CFG.Cache.Path + "/" + hex.EncodeToString(fileName[:])
+
+		mx.Lock()
+		if tempFS[fileName] == nil {
+			tempFS[fileName] = &file{}
+		}
+		f := *tempFS[fileName]
+		mx.Unlock()
+
+		if f.Content != nil {
+			f.Score += 2
+		} else {
+			file, err := os.Open(filePath)
+			if err != nil {
+				if dwnld := Download(url.String()); dwnld.Status == 200 && dwnld.Headers["Content-Type"][0][:5] == "image" {
+					f.Content = dwnld.Body
+					try(os.WriteFile(filePath, f.Content, 0700))
+				} else {
+					s.ReturnHTTPError(dwnld.Status)
+					return
+				}
+			} else {
+				file, e := io.ReadAll(file)
+				try(e)
+				f.Content = file
+			}
+
+			go func() {
+				defer restore()
+				for {
+					time.Sleep(1 * time.Minute)
+
+					mx.Lock()
+					if tempFS[fileName].Score <= 0 {
+						delete(tempFS, fileName)
+						mx.Unlock()
+						return
+					}
+					tempFS[fileName].Score--
+					mx.Unlock()
+				}
+			}()
+		}
+
+		mx.Lock()
+		tempFS[fileName] = &f
+		mx.Unlock()
+		response = f.Content
+	case CFG.Proxy:
+		dwnld := Download(url.String())
+		if dwnld.Status != 200 {
+			s.ReturnHTTPError(dwnld.Status)
+			return
+		}
+		response = dwnld.Body
+	default:
+		s.Writer.WriteHeader(403)
+		response = []byte("Sorry, butt proxy on this instance are disabled.")
+	}
+
+	s.Writer.Write(response)
+}
+
+func InitCacheSystem() {
+	c := &CFG.Cache
+	os.Mkdir(c.Path, 0700)
+	for {
+		dir, e := os.Open(c.Path)
+		try(e)
+		stat, e := dir.Stat()
+		try(e)
+
+		dirnames, e := dir.Readdirnames(-1)
+		try(e)
+		for _, a := range dirnames {
+			a = c.Path + "/" + a
+			if c.Lifetime != "" {
+				now := time.Now().UnixMilli()
+
+				f, _ := os.Stat(a)
+				stat := f.Sys().(*syscall.Stat_t)
+				time := statTime(stat)
+
+				if time+lifetimeParsed <= now {
+					try(os.RemoveAll(a))
+				}
+			}
+			if c.MaxSize != 0 && stat.Size() > c.MaxSize {
+				try(os.RemoveAll(a))
+			}
+		}
+
+		dir.Close()
+		time.Sleep(time.Second * time.Duration(c.UpdateInterval))
+	}
+}