forked from TrueCloudLab/restic
113 lines
2.7 KiB
Go
113 lines
2.7 KiB
Go
// Package location implements parsing the restic repository location from a string.
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package location
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import (
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"strings"
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"github.com/restic/restic/internal/backend/azure"
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"github.com/restic/restic/internal/backend/b2"
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"github.com/restic/restic/internal/backend/gs"
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"github.com/restic/restic/internal/backend/local"
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"github.com/restic/restic/internal/backend/rclone"
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"github.com/restic/restic/internal/backend/rest"
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"github.com/restic/restic/internal/backend/s3"
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"github.com/restic/restic/internal/backend/sftp"
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"github.com/restic/restic/internal/backend/swift"
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"github.com/restic/restic/internal/errors"
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)
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// Location specifies the location of a repository, including the method of
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// access and (possibly) credentials needed for access.
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type Location struct {
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Scheme string
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Config interface{}
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}
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type parser struct {
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scheme string
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parse func(string) (interface{}, error)
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}
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// parsers is a list of valid config parsers for the backends. The first parser
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// is the fallback and should always be set to the local backend.
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var parsers = []parser{
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{"b2", b2.ParseConfig},
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{"local", local.ParseConfig},
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{"sftp", sftp.ParseConfig},
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{"s3", s3.ParseConfig},
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{"gs", gs.ParseConfig},
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{"azure", azure.ParseConfig},
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{"swift", swift.ParseConfig},
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{"rest", rest.ParseConfig},
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{"rclone", rclone.ParseConfig},
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}
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func isPath(s string) bool {
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if strings.HasPrefix(s, "../") || strings.HasPrefix(s, `..\`) {
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return true
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}
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if strings.HasPrefix(s, "/") || strings.HasPrefix(s, `\`) {
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return true
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}
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if len(s) < 3 {
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return false
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}
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// check for drive paths
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drive := s[0]
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if !(drive >= 'a' && drive <= 'z') && !(drive >= 'A' && drive <= 'Z') {
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return false
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}
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if s[1] != ':' {
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return false
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}
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if s[2] != '\\' && s[2] != '/' {
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return false
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}
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return true
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}
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// Parse extracts repository location information from the string s. If s
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// starts with a backend name followed by a colon, that backend's Parse()
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// function is called. Otherwise, the local backend is used which interprets s
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// as the name of a directory.
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func Parse(s string) (u Location, err error) {
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scheme := extractScheme(s)
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u.Scheme = scheme
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for _, parser := range parsers {
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if parser.scheme != scheme {
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continue
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}
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u.Config, err = parser.parse(s)
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if err != nil {
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return Location{}, err
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}
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return u, nil
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}
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// if s is not a path or contains ":", it's ambiguous
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if !isPath(s) && strings.ContainsRune(s, ':') {
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return Location{}, errors.New("invalid backend\nIf the repo is in a local directory, you need to add a `local:` prefix")
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}
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u.Scheme = "local"
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u.Config, err = local.ParseConfig("local:" + s)
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if err != nil {
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return Location{}, err
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}
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return u, nil
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}
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func extractScheme(s string) string {
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data := strings.SplitN(s, ":", 2)
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return data[0]
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}
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