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opensend/internal/config/config.go

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/*
Copyright © 2021 Arsen Musayelyan
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
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package config
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import (
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"errors"
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"io/ioutil"
"os"
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"path/filepath"
"strings"
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"github.com/pelletier/go-toml"
"github.com/rs/zerolog/log"
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)
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// Struct for unmarshaling of opensend TOML configs
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type Config struct {
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Receiver ReceiverConfig
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Sender SenderConfig
Targets map[string]Target
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}
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// Config section for receiver
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type ReceiverConfig struct {
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DestDir string `toml:"destinationDirectory"`
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SkipZeroconf bool
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WorkDir string `toml:"workingDirectory"`
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}
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// Config section for sender
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type SenderConfig struct {
WorkDir string `toml:"workingDirectory"`
}
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type Target struct {
IP string
}
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// Attempt to find config path
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func GetConfigPath() string {
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// Use ConsoleWriter logger
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// Possible config locations
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configLocations := []string{"~/.config/opensend.toml", "/etc/opensend.toml"}
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// For every possible location
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for _, configLocation := range configLocations {
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// Expand path (~ -> home dir and os.ExpandEnv())
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expandedPath := ExpandPath(configLocation)
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// If file does not exist
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if _, err := os.Stat(expandedPath); errors.Is(err, os.ErrNotExist) {
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// Skip
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continue
}
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// Return path with existing file
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return expandedPath
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}
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// If all else fails, return empty screen
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return ""
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}
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// Create new config object using values from given path
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func NewConfig(path string) *Config {
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// Use ConsoleWriter logger
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// Create new empty config struct
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newConfig := &Config{}
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// Set config defaults
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newConfig.SetDefaults()
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// If path is provided
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if path != "" {
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// Read file at path
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confData, err := ioutil.ReadFile(path)
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if err != nil {
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log.Fatal().Err(err).Msg("Error reading config")
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}
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// Unmarshal config data
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err = toml.Unmarshal(confData, newConfig)
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if err != nil {
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log.Fatal().Err(err).Msg("Error unmarshalling toml")
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}
}
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// Return new config struct
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return newConfig
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}
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// Set config defaults
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func (config *Config) SetDefaults() {
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// Set destination directory to $HOME/Downloads
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config.Receiver.DestDir = ExpandPath("~/Downloads")
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// Set receiver working directory to $HOME/.opensend
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config.Receiver.WorkDir = ExpandPath("~/.opensend")
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// Set do not skip zeroconf
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config.Receiver.SkipZeroconf = false
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// Set sender working directory to $HOME/.opensend
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config.Sender.WorkDir = ExpandPath("~/.opensend")
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// Set targets to an empty map[string]map[string]string
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config.Targets = map[string]Target{}
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}
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func ExpandPath(s string) string {
// Use ConsoleWriter logger
// Get user's home directory
homeDir, err := os.UserHomeDir()
if err != nil {
log.Fatal().Err(err).Msg("Error getting home directory")
}
// Expand any environment variables in string
expandedString := os.ExpandEnv(s)
// If string starts with ~
if strings.HasPrefix(expandedString, "~") {
// Replace ~ with user's home directory
expandedString = strings.Replace(expandedString, "~", homeDir, 1)
}
// Clean file path
expandedString = filepath.Clean(expandedString)
// Return expanded string
return expandedString
}