111 lines
2.6 KiB
Go
111 lines
2.6 KiB
Go
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// Package pgpassfile is a parser PostgreSQL .pgpass files.
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package pgpassfile
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import (
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"bufio"
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"io"
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"os"
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"regexp"
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"strings"
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)
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// Entry represents a line in a PG passfile.
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type Entry struct {
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Hostname string
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Port string
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Database string
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Username string
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Password string
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}
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// Passfile is the in memory data structure representing a PG passfile.
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type Passfile struct {
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Entries []*Entry
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}
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// ReadPassfile reads the file at path and parses it into a Passfile.
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func ReadPassfile(path string) (*Passfile, error) {
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f, err := os.Open(path)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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return ParsePassfile(f)
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}
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// ParsePassfile reads r and parses it into a Passfile.
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func ParsePassfile(r io.Reader) (*Passfile, error) {
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passfile := &Passfile{}
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scanner := bufio.NewScanner(r)
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for scanner.Scan() {
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entry := parseLine(scanner.Text())
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if entry != nil {
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passfile.Entries = append(passfile.Entries, entry)
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}
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}
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return passfile, scanner.Err()
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}
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// Match (not colons or escaped colon or escaped backslash)+. Essentially gives a split on unescaped
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// colon.
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var colonSplitterRegexp = regexp.MustCompile("(([^:]|(\\:)))+")
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// var colonSplitterRegexp = regexp.MustCompile("((?:[^:]|(?:\\:)|(?:\\\\))+)")
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// parseLine parses a line into an *Entry. It returns nil on comment lines or any other unparsable
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// line.
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func parseLine(line string) *Entry {
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const (
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tmpBackslash = "\r"
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tmpColon = "\n"
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)
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line = strings.TrimSpace(line)
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if strings.HasPrefix(line, "#") {
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return nil
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}
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line = strings.Replace(line, `\\`, tmpBackslash, -1)
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line = strings.Replace(line, `\:`, tmpColon, -1)
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parts := strings.Split(line, ":")
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if len(parts) != 5 {
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return nil
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}
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// Unescape escaped colons and backslashes
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for i := range parts {
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parts[i] = strings.Replace(parts[i], tmpBackslash, `\`, -1)
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parts[i] = strings.Replace(parts[i], tmpColon, `:`, -1)
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}
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return &Entry{
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Hostname: parts[0],
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Port: parts[1],
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Database: parts[2],
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Username: parts[3],
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Password: parts[4],
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}
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}
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// FindPassword finds the password for the provided hostname, port, database, and username. For a
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// Unix domain socket hostname must be set to "localhost". An empty string will be returned if no
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// match is found.
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//
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// See https://www.postgresql.org/docs/current/libpq-pgpass.html for more password file information.
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func (pf *Passfile) FindPassword(hostname, port, database, username string) (password string) {
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for _, e := range pf.Entries {
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if (e.Hostname == "*" || e.Hostname == hostname) &&
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(e.Port == "*" || e.Port == port) &&
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(e.Database == "*" || e.Database == database) &&
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(e.Username == "*" || e.Username == username) {
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return e.Password
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}
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}
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return ""
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}
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