78 lines
2.1 KiB
Go
78 lines
2.1 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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// Package conffile contains code to load, manipulate, and access config file
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// settings.
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package conffile
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"os"
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"github.com/tailscale/hujson"
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"tailscale.com/ipn"
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)
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// Config describes a config file.
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type Config struct {
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Path string // disk path of HuJSON
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Raw []byte // raw bytes from disk, in HuJSON form
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Std []byte // standardized JSON form
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Version string // "alpha0" for now
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// Parsed is the parsed config, converted from its on-disk version to the
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// latest known format.
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//
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// As of 2023-10-15 there is exactly one format ("alpha0") so this is both
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// the on-disk format and the in-memory upgraded format.
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Parsed ipn.ConfigVAlpha
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}
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// WantRunning reports whether c is non-nil and it's configured to be running.
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func (c *Config) WantRunning() bool {
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return c != nil && !c.Parsed.Enabled.EqualBool(false)
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}
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// Load reads and parses the config file at the provided path on disk.
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func Load(path string) (*Config, error) {
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var c Config
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c.Path = path
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var err error
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c.Raw, err = os.ReadFile(path)
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if err != nil {
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return nil, err
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}
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c.Std, err = hujson.Standardize(c.Raw)
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if err != nil {
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return nil, fmt.Errorf("error parsing config file %s HuJSON/JSON: %w", path, err)
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}
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var ver struct {
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Version string `json:"version"`
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}
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if err := json.Unmarshal(c.Std, &ver); err != nil {
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return nil, fmt.Errorf("error parsing config file %s: %w", path, err)
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}
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switch ver.Version {
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case "":
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return nil, fmt.Errorf("error parsing config file %s: no \"version\" field defined", path)
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case "alpha0":
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default:
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return nil, fmt.Errorf("error parsing config file %s: unsupported \"version\" value %q; want \"alpha0\" for now", path, ver.Version)
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}
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c.Version = ver.Version
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jd := json.NewDecoder(bytes.NewReader(c.Std))
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jd.DisallowUnknownFields()
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err = jd.Decode(&c.Parsed)
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if err != nil {
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return nil, fmt.Errorf("error parsing config file %s: %w", path, err)
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}
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if jd.More() {
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return nil, fmt.Errorf("error parsing config file %s: trailing data after JSON object", path)
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}
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return &c, nil
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}
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