126 lines
2.9 KiB
Go
126 lines
2.9 KiB
Go
package policy
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import (
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"context"
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"fmt"
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"path"
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"strings"
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"time"
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"github.com/rclone/rclone/backend/union/upstream"
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"github.com/rclone/rclone/fs"
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)
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var policies = make(map[string]Policy)
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// Policy is the interface of a set of defined behavior choosing
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// the upstream Fs to operate on
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type Policy interface {
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// Action category policy, governing the modification of files and directories
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Action(ctx context.Context, upstreams []*upstream.Fs, path string) ([]*upstream.Fs, error)
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// Create category policy, governing the creation of files and directories
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Create(ctx context.Context, upstreams []*upstream.Fs, path string) ([]*upstream.Fs, error)
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// Search category policy, governing the access to files and directories
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Search(ctx context.Context, upstreams []*upstream.Fs, path string) (*upstream.Fs, error)
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// ActionEntries is ACTION category policy but receiving a set of candidate entries
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ActionEntries(entries ...upstream.Entry) ([]upstream.Entry, error)
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// CreateEntries is CREATE category policy but receiving a set of candidate entries
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CreateEntries(entries ...upstream.Entry) ([]upstream.Entry, error)
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// SearchEntries is SEARCH category policy but receiving a set of candidate entries
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SearchEntries(entries ...upstream.Entry) (upstream.Entry, error)
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}
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func registerPolicy(name string, p Policy) {
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policies[strings.ToLower(name)] = p
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}
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// Get a Policy from the list
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func Get(name string) (Policy, error) {
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p, ok := policies[strings.ToLower(name)]
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if !ok {
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return nil, fmt.Errorf("didn't find policy called %q", name)
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}
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return p, nil
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}
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func filterRO(ufs []*upstream.Fs) (wufs []*upstream.Fs) {
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for _, u := range ufs {
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if u.IsWritable() {
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wufs = append(wufs, u)
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}
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}
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return wufs
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}
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func filterROEntries(ue []upstream.Entry) (wue []upstream.Entry) {
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for _, e := range ue {
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if e.UpstreamFs().IsWritable() {
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wue = append(wue, e)
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}
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}
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return wue
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}
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func filterNC(ufs []*upstream.Fs) (wufs []*upstream.Fs) {
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for _, u := range ufs {
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if u.IsCreatable() {
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wufs = append(wufs, u)
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}
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}
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return wufs
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}
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func filterNCEntries(ue []upstream.Entry) (wue []upstream.Entry) {
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for _, e := range ue {
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if e.UpstreamFs().IsCreatable() {
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wue = append(wue, e)
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}
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}
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return wue
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}
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func parentDir(absPath string) string {
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parent := path.Dir(strings.TrimRight(absPath, "/"))
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if parent == "." {
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parent = ""
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}
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return parent
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}
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func clean(absPath string) string {
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cleanPath := path.Clean(absPath)
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if cleanPath == "." {
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cleanPath = ""
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}
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return cleanPath
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}
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func findEntry(ctx context.Context, f fs.Fs, remote string) fs.DirEntry {
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remote = clean(remote)
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dir := parentDir(remote)
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entries, err := f.List(ctx, dir)
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if remote == dir {
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if err != nil {
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return nil
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}
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return fs.NewDir("", time.Time{})
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}
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found := false
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for _, e := range entries {
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eRemote := e.Remote()
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if f.Features().CaseInsensitive {
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found = strings.EqualFold(remote, eRemote)
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} else {
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found = (remote == eRemote)
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}
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if found {
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return e
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}
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}
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return nil
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}
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