From 57224ffa79aac59155a0f6a4ad47f224cac736fd Mon Sep 17 00:00:00 2001
From: Niall Sheridan <nsheridan@gmail.com>
Date: Fri, 13 Jan 2017 00:06:46 +0000
Subject: Use wkfs to manage the lets encrypt cache

---
 .../nsheridan/autocert-wkfs-cache/cache.go         | 85 ++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 vendor/github.com/nsheridan/autocert-wkfs-cache/cache.go

(limited to 'vendor/github.com/nsheridan/autocert-wkfs-cache/cache.go')

diff --git a/vendor/github.com/nsheridan/autocert-wkfs-cache/cache.go b/vendor/github.com/nsheridan/autocert-wkfs-cache/cache.go
new file mode 100644
index 0000000..e829ef2
--- /dev/null
+++ b/vendor/github.com/nsheridan/autocert-wkfs-cache/cache.go
@@ -0,0 +1,85 @@
+package wkfscache
+
+import (
+	"os"
+	"path/filepath"
+
+	"go4.org/wkfs"
+
+	"golang.org/x/crypto/acme/autocert"
+	"golang.org/x/net/context"
+)
+
+type Cache string
+
+// Get reads a certificate data from the specified file name.
+func (d Cache) Get(ctx context.Context, name string) ([]byte, error) {
+	name = filepath.Join(string(d), name)
+	var (
+		data []byte
+		err  error
+		done = make(chan struct{})
+	)
+	go func() {
+		data, err = wkfs.ReadFile(name)
+		close(done)
+	}()
+	select {
+	case <-ctx.Done():
+		return nil, ctx.Err()
+	case <-done:
+	}
+	if os.IsNotExist(err) {
+		return nil, autocert.ErrCacheMiss
+	}
+	return data, err
+}
+
+// Put writes the certificate data to the specified file name.
+// The file will be created with 0600 permissions.
+func (d Cache) Put(ctx context.Context, name string, data []byte) error {
+	if err := wkfs.MkdirAll(string(d), 0700); err != nil {
+		return err
+	}
+
+	done := make(chan struct{})
+	var err error
+	go func() {
+		defer close(done)
+		if err := wkfs.WriteFile(filepath.Join(string(d), name), data, 0600); err != nil {
+			return
+		}
+		// prevent overwriting the file if the context was cancelled
+		if ctx.Err() != nil {
+			return // no need to set err
+		}
+	}()
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	case <-done:
+	}
+	return err
+}
+
+// Delete removes the specified file name.
+func (d Cache) Delete(ctx context.Context, name string) error {
+	name = filepath.Join(string(d), name)
+	var (
+		err  error
+		done = make(chan struct{})
+	)
+	go func() {
+		err = wkfs.Remove(name)
+		close(done)
+	}()
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	case <-done:
+	}
+	if err != nil && !os.IsNotExist(err) {
+		return err
+	}
+	return nil
+}
-- 
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