further yak shaving

internal/config/config.go

@@ -0,0 +1,72 @@
+/*
+   GoToSocial
+   Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
+
+   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 <http://www.gnu.org/licenses/>.
+*/
+
+package config
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+
+	"github.com/gotosocial/gotosocial/internal/db"
+)
+
+// Config contains all the configuration needed to run gotosocial
+type Config struct {
+	DBConfig *db.Config `json:"db,omitempty"`
+}
+
+// New returns a new config, or an error if something goes amiss.
+// The path parameter is optional, for loading a configuration json from the given path.
+func New(path string) (*Config, error) {
+	var config *Config
+	if path != "" {
+		var err error
+		if config, err = loadFromFile(path); err != nil {
+			return nil, fmt.Errorf("error creating config: %s", err)
+		}
+	}
+
+	return config, nil
+}
+
+// loadFromFile takes a path to a .json file and attempts to load a Config object from it
+func loadFromFile(path string) (*Config, error) {
+	bytes, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("could not read file at path %s: %s", path, err)
+	}
+
+	config := &Config{}
+	if err := json.Unmarshal(bytes, config); err != nil {
+		return nil, fmt.Errorf("could not unmarshal file at path %s: %s", path, err)
+	}
+
+	return config, nil
+}
+
+// WithFlags returns a copy of this config object with flags set using the provided flags object
+func (c *Config) WithFlags(f Flags) *Config {
+	return c
+}
+
+// Flags is a wrapper for any type that can store keyed flags and give them back
+type Flags interface {
+	String(k string) string
+	Int(k string) int
+}