Consolidate config related functionality into the config package

config/parser.go

@@ -0,0 +1,119 @@
+package config
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"sync"
+
+	"github.com/ooni/probe-cli/utils"
+	"github.com/pkg/errors"
+)
+
+// ReadConfig reads the configuration from the path
+func ReadConfig(path string) (*Config, error) {
+	b, err := ioutil.ReadFile(path)
+
+	if os.IsNotExist(err) {
+		c := &Config{}
+
+		if err = c.Default(); err != nil {
+			return nil, errors.Wrap(err, "defaulting")
+		}
+
+		if err = c.Validate(); err != nil {
+			return nil, errors.Wrap(err, "validating")
+		}
+
+		return c, nil
+	}
+
+	if err != nil {
+		return nil, errors.Wrap(err, "reading file")
+	}
+
+	c, err := ParseConfig(b)
+	if err != nil {
+		return nil, errors.Wrap(err, "parsing config")
+	}
+	c.path = path
+	return c, err
+}
+
+// ParseConfig returns config from JSON bytes.
+func ParseConfig(b []byte) (*Config, error) {
+	c := &Config{}
+
+	if err := json.Unmarshal(b, c); err != nil {
+		return nil, errors.Wrap(err, "parsing json")
+	}
+
+	if err := c.Default(); err != nil {
+		return nil, errors.Wrap(err, "defaulting")
+	}
+
+	if err := c.Validate(); err != nil {
+		return nil, errors.Wrap(err, "validating")
+	}
+
+	return c, nil
+}
+
+// Config for the OONI Probe installation
+type Config struct {
+	// Private settings
+	Comment         string `json:"_"`
+	Version         int64  `json:"_version"`
+	InformedConsent bool   `json:"_informed_consent"`
+
+	AutoUpdate       bool             `json:"auto_update"`
+	Sharing          Sharing          `json:"sharing"`
+	Notifications    Notifications    `json:"notifications"`
+	AutomatedTesting AutomatedTesting `json:"automated_testing"`
+	NettestGroups    NettestGroups    `json:"test_settings"`
+	Advanced         Advanced         `json:"advanced"`
+
+	mutex sync.Mutex
+	path  string
+}
+
+// Write the config file in json to the path
+func (c *Config) Write() error {
+	c.Lock()
+	configJSON, _ := json.MarshalIndent(c, "", "  ")
+	if c.path == "" {
+		return errors.New("config file path is empty")
+	}
+	if err := ioutil.WriteFile(c.path, configJSON, 0644); err != nil {
+		return errors.Wrap(err, "writing config JSON")
+	}
+	c.Unlock()
+	return nil
+}
+
+// Lock acquires the write mutex
+func (c *Config) Lock() {
+	c.mutex.Lock()
+}
+
+// Unlock releases the write mutex
+func (c *Config) Unlock() {
+	c.mutex.Unlock()
+}
+
+// Default config settings
+func (c *Config) Default() error {
+	home, err := utils.GetOONIHome()
+	if err != nil {
+		return err
+	}
+
+	c.path = filepath.Join(home, "config.json")
+	return nil
+}
+
+// Validate the config file
+func (c *Config) Validate() error {
+	return nil
+}