mirror of
https://github.com/rclone/rclone.git
synced 2024-11-27 10:50:03 +08:00
445 lines
12 KiB
Go
445 lines
12 KiB
Go
package info
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// FIXME once translations are implemented will need a no-escape
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// option for Put so we can make these tests work agaig
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import (
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"bytes"
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"context"
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"encoding/json"
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"fmt"
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"io"
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"os"
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"path"
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"regexp"
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"sort"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/pkg/errors"
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"github.com/rclone/rclone/cmd"
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"github.com/rclone/rclone/cmd/info/internal"
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"github.com/rclone/rclone/fs"
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"github.com/rclone/rclone/fs/hash"
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"github.com/rclone/rclone/fs/object"
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"github.com/rclone/rclone/lib/random"
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"github.com/spf13/cobra"
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)
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var (
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writeJSON string
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checkNormalization bool
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checkControl bool
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checkLength bool
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checkStreaming bool
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uploadWait time.Duration
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positionLeftRe = regexp.MustCompile(`(?s)^(.*)-position-left-([[:xdigit:]]+)$`)
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positionMiddleRe = regexp.MustCompile(`(?s)^position-middle-([[:xdigit:]]+)-(.*)-$`)
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positionRightRe = regexp.MustCompile(`(?s)^position-right-([[:xdigit:]]+)-(.*)$`)
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)
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func init() {
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cmd.Root.AddCommand(commandDefinition)
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commandDefinition.Flags().StringVarP(&writeJSON, "write-json", "", "", "Write results to file.")
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commandDefinition.Flags().BoolVarP(&checkNormalization, "check-normalization", "", true, "Check UTF-8 Normalization.")
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commandDefinition.Flags().BoolVarP(&checkControl, "check-control", "", true, "Check control characters.")
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commandDefinition.Flags().DurationVarP(&uploadWait, "upload-wait", "", 0, "Wait after writing a file.")
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commandDefinition.Flags().BoolVarP(&checkLength, "check-length", "", true, "Check max filename length.")
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commandDefinition.Flags().BoolVarP(&checkStreaming, "check-streaming", "", true, "Check uploads with indeterminate file size.")
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}
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var commandDefinition = &cobra.Command{
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Use: "info [remote:path]+",
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Short: `Discovers file name or other limitations for paths.`,
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Long: `rclone info discovers what filenames and upload methods are possible
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to write to the paths passed in and how long they can be. It can take some
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time. It will write test files into the remote:path passed in. It outputs
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a bit of go code for each one.
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`,
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Hidden: true,
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Run: func(command *cobra.Command, args []string) {
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cmd.CheckArgs(1, 1e6, command, args)
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for i := range args {
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f := cmd.NewFsDir(args[i : i+1])
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cmd.Run(false, false, command, func() error {
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return readInfo(context.Background(), f)
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})
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}
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},
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}
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type results struct {
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ctx context.Context
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f fs.Fs
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mu sync.Mutex
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stringNeedsEscaping map[string]internal.Position
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controlResults map[string]internal.ControlResult
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maxFileLength int
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canWriteUnnormalized bool
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canReadUnnormalized bool
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canReadRenormalized bool
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canStream bool
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}
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func newResults(ctx context.Context, f fs.Fs) *results {
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return &results{
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ctx: ctx,
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f: f,
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stringNeedsEscaping: make(map[string]internal.Position),
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controlResults: make(map[string]internal.ControlResult),
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}
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}
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// Print the results to stdout
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func (r *results) Print() {
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fmt.Printf("// %s\n", r.f.Name())
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if checkControl {
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escape := []string{}
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for c, needsEscape := range r.stringNeedsEscaping {
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if needsEscape != internal.PositionNone {
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k := strconv.Quote(c)
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k = k[1 : len(k)-1]
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escape = append(escape, fmt.Sprintf("'%s'", k))
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}
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}
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sort.Strings(escape)
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fmt.Printf("stringNeedsEscaping = []rune{\n")
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fmt.Printf("\t%s\n", strings.Join(escape, ", "))
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fmt.Printf("}\n")
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}
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if checkLength {
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fmt.Printf("maxFileLength = %d\n", r.maxFileLength)
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}
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if checkNormalization {
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fmt.Printf("canWriteUnnormalized = %v\n", r.canWriteUnnormalized)
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fmt.Printf("canReadUnnormalized = %v\n", r.canReadUnnormalized)
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fmt.Printf("canReadRenormalized = %v\n", r.canReadRenormalized)
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}
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if checkStreaming {
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fmt.Printf("canStream = %v\n", r.canStream)
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}
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}
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// WriteJSON writes the results to a JSON file when requested
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func (r *results) WriteJSON() {
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if writeJSON == "" {
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return
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}
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report := internal.InfoReport{
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Remote: r.f.Name(),
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}
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if checkControl {
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report.ControlCharacters = &r.controlResults
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}
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if checkLength {
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report.MaxFileLength = &r.maxFileLength
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}
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if checkNormalization {
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report.CanWriteUnnormalized = &r.canWriteUnnormalized
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report.CanReadUnnormalized = &r.canReadUnnormalized
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report.CanReadRenormalized = &r.canReadRenormalized
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}
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if checkStreaming {
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report.CanStream = &r.canStream
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}
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if f, err := os.Create(writeJSON); err != nil {
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fs.Errorf(r.f, "Creating JSON file failed: %s", err)
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} else {
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defer fs.CheckClose(f, &err)
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enc := json.NewEncoder(f)
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enc.SetIndent("", " ")
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err := enc.Encode(report)
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if err != nil {
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fs.Errorf(r.f, "Writing JSON file failed: %s", err)
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}
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}
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fs.Infof(r.f, "Wrote JSON file: %s", writeJSON)
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}
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// writeFile writes a file with some random contents
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func (r *results) writeFile(path string) (fs.Object, error) {
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contents := random.String(50)
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src := object.NewStaticObjectInfo(path, time.Now(), int64(len(contents)), true, nil, r.f)
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obj, err := r.f.Put(r.ctx, bytes.NewBufferString(contents), src)
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if uploadWait > 0 {
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time.Sleep(uploadWait)
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}
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return obj, err
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}
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// check whether normalization is enforced and check whether it is
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// done on the files anyway
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func (r *results) checkUTF8Normalization() {
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unnormalized := "Héroique"
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normalized := "Héroique"
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_, err := r.writeFile(unnormalized)
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if err != nil {
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r.canWriteUnnormalized = false
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return
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}
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r.canWriteUnnormalized = true
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_, err = r.f.NewObject(r.ctx, unnormalized)
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if err == nil {
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r.canReadUnnormalized = true
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}
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_, err = r.f.NewObject(r.ctx, normalized)
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if err == nil {
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r.canReadRenormalized = true
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}
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}
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func (r *results) checkStringPositions(k, s string) {
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fs.Infof(r.f, "Writing position file 0x%0X", s)
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positionError := internal.PositionNone
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res := internal.ControlResult{
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Text: s,
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WriteError: make(map[internal.Position]string, 3),
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GetError: make(map[internal.Position]string, 3),
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InList: make(map[internal.Position]internal.Presence, 3),
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}
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for _, pos := range internal.PositionList {
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path := ""
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switch pos {
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case internal.PositionMiddle:
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path = fmt.Sprintf("position-middle-%0X-%s-", s, s)
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case internal.PositionLeft:
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path = fmt.Sprintf("%s-position-left-%0X", s, s)
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case internal.PositionRight:
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path = fmt.Sprintf("position-right-%0X-%s", s, s)
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default:
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panic("invalid position: " + pos.String())
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}
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_, writeError := r.writeFile(path)
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if writeError != nil {
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res.WriteError[pos] = writeError.Error()
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fs.Infof(r.f, "Writing %s position file 0x%0X Error: %s", pos.String(), s, writeError)
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} else {
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fs.Infof(r.f, "Writing %s position file 0x%0X OK", pos.String(), s)
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}
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obj, getErr := r.f.NewObject(r.ctx, path)
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if getErr != nil {
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res.GetError[pos] = getErr.Error()
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fs.Infof(r.f, "Getting %s position file 0x%0X Error: %s", pos.String(), s, getErr)
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} else {
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if obj.Size() != 50 {
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res.GetError[pos] = fmt.Sprintf("invalid size %d", obj.Size())
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fs.Infof(r.f, "Getting %s position file 0x%0X Invalid Size: %d", pos.String(), s, obj.Size())
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} else {
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fs.Infof(r.f, "Getting %s position file 0x%0X OK", pos.String(), s)
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}
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}
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if writeError != nil || getErr != nil {
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positionError += pos
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}
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}
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r.mu.Lock()
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r.stringNeedsEscaping[k] = positionError
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r.controlResults[k] = res
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r.mu.Unlock()
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}
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// check we can write a file with the control chars
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func (r *results) checkControls() {
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fs.Infof(r.f, "Trying to create control character file names")
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// Concurrency control
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tokens := make(chan struct{}, fs.Config.Checkers)
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for i := 0; i < fs.Config.Checkers; i++ {
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tokens <- struct{}{}
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}
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var wg sync.WaitGroup
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for i := rune(0); i < 128; i++ {
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s := string(i)
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if i == 0 || i == '/' {
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// We're not even going to check NULL or /
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r.stringNeedsEscaping[s] = internal.PositionAll
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continue
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}
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wg.Add(1)
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go func(s string) {
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defer wg.Done()
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token := <-tokens
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k := s
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r.checkStringPositions(k, s)
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tokens <- token
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}(s)
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}
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for _, s := range []string{"＼", "\u00A0", "\xBF", "\xFE"} {
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wg.Add(1)
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go func(s string) {
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defer wg.Done()
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token := <-tokens
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k := s
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r.checkStringPositions(k, s)
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tokens <- token
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}(s)
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}
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wg.Wait()
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r.checkControlsList()
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fs.Infof(r.f, "Done trying to create control character file names")
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}
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func (r *results) checkControlsList() {
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l, err := r.f.List(context.TODO(), "")
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if err != nil {
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fs.Errorf(r.f, "Listing control character file names failed: %s", err)
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return
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}
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namesMap := make(map[string]struct{}, len(l))
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for _, s := range l {
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namesMap[path.Base(s.Remote())] = struct{}{}
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}
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for path := range namesMap {
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var pos internal.Position
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var hex, value string
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if g := positionLeftRe.FindStringSubmatch(path); g != nil {
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pos, hex, value = internal.PositionLeft, g[2], g[1]
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} else if g := positionMiddleRe.FindStringSubmatch(path); g != nil {
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pos, hex, value = internal.PositionMiddle, g[1], g[2]
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} else if g := positionRightRe.FindStringSubmatch(path); g != nil {
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pos, hex, value = internal.PositionRight, g[1], g[2]
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} else {
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fs.Infof(r.f, "Unknown path %q", path)
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continue
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}
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var hexValue []byte
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for ; len(hex) >= 2; hex = hex[2:] {
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if b, err := strconv.ParseUint(hex[:2], 16, 8); err != nil {
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fs.Infof(r.f, "Invalid path %q: %s", path, err)
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continue
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} else {
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hexValue = append(hexValue, byte(b))
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}
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}
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if hex != "" {
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fs.Infof(r.f, "Invalid path %q", path)
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continue
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}
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hexStr := string(hexValue)
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k := hexStr
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switch r.controlResults[k].InList[pos] {
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case internal.Absent:
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if hexStr == value {
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r.controlResults[k].InList[pos] = internal.Present
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} else {
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r.controlResults[k].InList[pos] = internal.Renamed
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}
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case internal.Present:
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r.controlResults[k].InList[pos] = internal.Multiple
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case internal.Renamed:
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r.controlResults[k].InList[pos] = internal.Multiple
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}
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delete(namesMap, path)
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}
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if len(namesMap) > 0 {
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fs.Infof(r.f, "Found additional control character file names:")
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for name := range namesMap {
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fs.Infof(r.f, "%q", name)
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}
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}
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}
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// find the max file name size we can use
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func (r *results) findMaxLength() {
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const maxLen = 16 * 1024
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name := make([]byte, maxLen)
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for i := range name {
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name[i] = 'a'
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}
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// Find the first size of filename we can't write
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i := sort.Search(len(name), func(i int) (fail bool) {
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defer func() {
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if err := recover(); err != nil {
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fs.Infof(r.f, "Couldn't write file with name length %d: %v", i, err)
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fail = true
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}
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}()
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path := string(name[:i])
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_, err := r.writeFile(path)
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if err != nil {
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fs.Infof(r.f, "Couldn't write file with name length %d: %v", i, err)
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return true
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}
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fs.Infof(r.f, "Wrote file with name length %d", i)
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return false
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})
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r.maxFileLength = i - 1
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fs.Infof(r.f, "Max file length is %d", r.maxFileLength)
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}
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func (r *results) checkStreaming() {
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putter := r.f.Put
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if r.f.Features().PutStream != nil {
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fs.Infof(r.f, "Given remote has specialized streaming function. Using that to test streaming.")
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putter = r.f.Features().PutStream
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}
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contents := "thinking of test strings is hard"
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buf := bytes.NewBufferString(contents)
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hashIn := hash.NewMultiHasher()
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in := io.TeeReader(buf, hashIn)
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objIn := object.NewStaticObjectInfo("checkStreamingTest", time.Now(), -1, true, nil, r.f)
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objR, err := putter(r.ctx, in, objIn)
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if err != nil {
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fs.Infof(r.f, "Streamed file failed to upload (%v)", err)
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r.canStream = false
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return
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}
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hashes := hashIn.Sums()
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types := objR.Fs().Hashes().Array()
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for _, Hash := range types {
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sum, err := objR.Hash(r.ctx, Hash)
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if err != nil {
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fs.Infof(r.f, "Streamed file failed when getting hash %v (%v)", Hash, err)
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r.canStream = false
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return
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}
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if !hash.Equals(hashes[Hash], sum) {
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fs.Infof(r.f, "Streamed file has incorrect hash %v: expecting %q got %q", Hash, hashes[Hash], sum)
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r.canStream = false
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return
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}
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}
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if int64(len(contents)) != objR.Size() {
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fs.Infof(r.f, "Streamed file has incorrect file size: expecting %d got %d", len(contents), objR.Size())
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r.canStream = false
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return
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}
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r.canStream = true
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}
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func readInfo(ctx context.Context, f fs.Fs) error {
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err := f.Mkdir(ctx, "")
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if err != nil {
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return errors.Wrap(err, "couldn't mkdir")
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}
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r := newResults(ctx, f)
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if checkControl {
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r.checkControls()
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}
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if checkLength {
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r.findMaxLength()
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}
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if checkNormalization {
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r.checkUTF8Normalization()
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}
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if checkStreaming {
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r.checkStreaming()
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}
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r.Print()
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r.WriteJSON()
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return nil
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}
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