cache, http client, vault

cache.go

@@ -0,0 +1,50 @@
+package sshvault
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"os/user"
+	"path/filepath"
+)
+
+type cache struct {
+	dir string
+}
+
+func Cache() *cache {
+	usr, _ := user.Current()
+	sv := filepath.Join(usr.HomeDir, ".ssh-vault", "keys")
+	if _, err := os.Stat(sv); os.IsNotExist(err) {
+		os.MkdirAll(sv, os.ModePerm)
+	}
+	return &cache{sv}
+}
+
+func (c *cache) Get(u string) (string, error) {
+	uKey := fmt.Sprintf("%s/%s.key", c.dir, u)
+	if c.isFile(uKey) {
+		// read from file and return
+	}
+	key, err := GetKey(u)
+	if err != nil {
+		return "", err
+	}
+	err = ioutil.WriteFile(uKey, []byte(key), 0644)
+	if err != nil {
+		log.Println(err)
+	}
+	return key, nil
+}
+
+func (c *cache) isFile(path string) bool {
+	f, err := os.Stat(path)
+	if err != nil {
+		return false
+	}
+	if m := f.Mode(); !m.IsDir() && m.IsRegular() && m&400 != 0 {
+		return true
+	}
+	return false
+}