From 07db4ab5bd8765631ba5073041190a2f11324992 Mon Sep 17 00:00:00 2001
From: Julien Dessaux
Date: Mon, 10 Jun 2024 23:22:33 +0200
Subject: feat(stdlib): added borg server custom promise

---
 stdlib/backups/borg/common.go |   9 ++++
 stdlib/backups/borg/server.go | 100 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 109 insertions(+)
 create mode 100644 stdlib/backups/borg/common.go
 create mode 100644 stdlib/backups/borg/server.go

diff --git a/stdlib/backups/borg/common.go b/stdlib/backups/borg/common.go
new file mode 100644
index 0000000..60d14f2
--- /dev/null
+++ b/stdlib/backups/borg/common.go
@@ -0,0 +1,9 @@
+package borg
+
+import gonf "git.adyxax.org/adyxax/gonf/v2/pkg"
+
+func installBorgPackage() gonf.Status {
+	packag := gonf.Package("borgbackup")
+	packag.Resolve()
+	return packag.Status()
+}
diff --git a/stdlib/backups/borg/server.go b/stdlib/backups/borg/server.go
new file mode 100644
index 0000000..95768da
--- /dev/null
+++ b/stdlib/backups/borg/server.go
@@ -0,0 +1,100 @@
+package borg
+
+import (
+	"log/slog"
+	"path/filepath"
+
+	gonf "git.adyxax.org/adyxax/gonf/v2/pkg"
+)
+
+type BorgServer struct {
+	chain   []gonf.Promise
+	clients map[string][]byte // name -> publicKey
+	path    string
+	user    string
+	status  gonf.Status
+}
+
+func (b *BorgServer) IfRepaired(p ...gonf.Promise) gonf.Promise {
+	b.chain = append(b.chain, p...)
+	return b
+}
+
+func (b *BorgServer) Promise() gonf.Promise {
+	gonf.MakeCustomPromise(b).Promise()
+	return b
+}
+
+func (b *BorgServer) Resolve() {
+	b.status = gonf.KEPT
+	// Borg user
+	user := gonf.User(gonf.UserData{
+		HomeDir: b.path,
+		Name:    "borg",
+		System:  true,
+	})
+	user.Resolve()
+	switch user.Status() {
+	case gonf.BROKEN:
+		b.status = gonf.BROKEN
+		return
+	case gonf.REPAIRED:
+		b.status = gonf.REPAIRED
+	}
+	// borg package
+	switch installBorgPackage() {
+	case gonf.BROKEN:
+		b.status = gonf.BROKEN
+		return
+	case gonf.REPAIRED:
+		b.status = gonf.REPAIRED
+	}
+	// authorized_keys
+	borgDir := gonf.ModeUserGroup(0700, "borg", "borg")
+	borgRO := gonf.ModeUserGroup(0400, "borg", "borg")
+	file := gonf.File(filepath.Join(b.path, ".ssh/authorized_keys")).
+		DirectoriesPermissions(borgDir).
+		Permissions(borgRO)
+	authorizedKeys := ""
+	// we sort the names so that the file contents are stable
+	names := make([]string, len(b.clients)-1)
+	for name := range b.clients {
+		names = append(names, name)
+	}
+	for _, name := range names {
+		key := b.clients[name]
+		authorizedKeys += "command=\"borg serve --restrict-to-path " + filepath.Join(b.path, name) + "\",restrict " + string(key) + "\n"
+	}
+	file.Contents(authorizedKeys).Resolve()
+	switch file.Status() {
+	case gonf.BROKEN:
+		b.status = gonf.BROKEN
+		return
+	case gonf.REPAIRED:
+		b.status = gonf.REPAIRED
+	}
+	// TODO init repositories? or let the borg client do it?
+}
+
+func (b BorgServer) Status() gonf.Status {
+	return b.status
+}
+
+func Server() *BorgServer {
+	return &BorgServer{
+		chain:   nil,
+		clients: make(map[string][]byte),
+		path:    "/srv/borg/",
+		user:    "borg",
+		status:  gonf.PROMISED,
+	}
+}
+
+func (b *BorgServer) Add(name string, publicKey []byte) *BorgServer {
+	if _, ok := b.clients[name]; ok {
+		slog.Debug("Duplicate name for BorgServer", "name", name)
+		panic("Duplicate name for BorgServer")
+	}
+	b.clients[name] = publicKey
+	return b
+}
-- 
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