First working version

[nsscash/nsscash.git] / config.go

diff --git a/config.go b/config.go
new file mode 100644 (file)
index 0000000..8e9a630
--- /dev/null
+++ b/config.go
@@ -0,0 +1,87 @@
+// Configuration file parsing and validation
+
+// Copyright (C) 2019  Simon Ruderich
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package main
+
+import (
+       "fmt"
+
+       "github.com/BurntSushi/toml"
+)
+
+type Config struct {
+       StatePath string
+       Files     []File `toml:"file"`
+}
+
+type File struct {
+       Type FileType
+       Url  string
+       Path string
+
+       body []byte // internally used by handleFiles()
+}
+
+//go:generate stringer -type=FileType
+type FileType int
+
+const (
+       FileTypePlain FileType = iota
+       FileTypePasswd
+)
+
+func (t *FileType) UnmarshalText(text []byte) error {
+       switch string(text) {
+       case "plain":
+               *t = FileTypePlain
+       case "passwd":
+               *t = FileTypePasswd
+       default:
+               return fmt.Errorf("invalid file type %q", text)
+       }
+       return nil
+}
+
+func LoadConfig(path string) (*Config, error) {
+       var cfg Config
+
+       md, err := toml.DecodeFile(path, &cfg)
+       if err != nil {
+               return nil, err
+       }
+       undecoded := md.Undecoded()
+       if len(undecoded) != 0 {
+               return nil, fmt.Errorf("invalid fields used: %q", undecoded)
+       }
+
+       if cfg.StatePath == "" {
+               return nil, fmt.Errorf("statepath must not be empty")
+       }
+
+       for i, f := range cfg.Files {
+               if f.Url == "" {
+                       return nil, fmt.Errorf(
+                               "file[%d].url must not be empty", i)
+               }
+               if f.Path == "" {
+                       return nil, fmt.Errorf(
+                               "file[%d].path must not be empty", i)
+               }
+       }
+
+       return &cfg, nil
+}