mirror of
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61 lines
1.9 KiB
Go
61 lines
1.9 KiB
Go
// Package storage abstracts away where middleware can store assests (zones, keys, etc).
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package storage
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import (
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"net/http"
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"os"
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"path"
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"path/filepath"
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"runtime"
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)
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// dir wraps an http.Dir that restrict file access to a specific directory tree, see http.Dir's documentation
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// for methods for accessing files.
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type dir http.Dir
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// CoreDir is the directory where middleware can store assets, like zone files after a zone transfer
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// or public and private keys or anything else a middleware might need. The convention is to place
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// assets in a subdirectory named after the zone prefixed with "D", to prevent the root zone become a hidden directory.
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//
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// Dexample.org/Kexample.org<something>.key
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//
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// Note that subzone(s) under example.org are places in the own directory under CoreDir:
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//
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// Dexample.org/...
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// Db.example.org/...
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//
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// CoreDir will default to "$HOME/.coredns" on Unix, but it's location can be overridden with the COREDNSPATH
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// environment variable.
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var CoreDir = dir(fsPath())
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func (d dir) Zone(z string) dir {
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if z != "." && z[len(z)-2] == '.' {
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return dir(path.Join(string(d), "D"+z[:len(z)-1]))
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}
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return dir(path.Join(string(d), "D"+z))
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}
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// fsPath returns the path to the directory where the application may store data.
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// If COREDNSPATH env variable. is set, that value is used. Otherwise, the path is
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// the result of evaluating "$HOME/.coredns".
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func fsPath() string {
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if corePath := os.Getenv("COREDNSPATH"); corePath != "" {
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return corePath
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}
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return filepath.Join(userHomeDir(), ".coredns")
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}
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// userHomeDir returns the user's home directory according to environment variables.
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//
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// Credit: http://stackoverflow.com/a/7922977/1048862
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func userHomeDir() string {
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if runtime.GOOS == "windows" {
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home := os.Getenv("HOMEDRIVE") + os.Getenv("HOMEPATH")
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if home == "" {
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home = os.Getenv("USERPROFILE")
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}
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return home
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}
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return os.Getenv("HOME")
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}
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