mirror of
https://github.com/rclone/rclone.git
synced 2024-11-07 17:14:44 +01:00
316 lines
8.8 KiB
Go
316 lines
8.8 KiB
Go
// Package rc provides the rc command.
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package rc
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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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"errors"
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"fmt"
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"io"
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"net/http"
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"os"
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"strings"
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"github.com/rclone/rclone/cmd"
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"github.com/rclone/rclone/fs"
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"github.com/rclone/rclone/fs/config/flags"
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"github.com/rclone/rclone/fs/fshttp"
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"github.com/rclone/rclone/fs/rc"
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"github.com/rclone/rclone/fs/rc/jobs"
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"github.com/spf13/cobra"
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"github.com/spf13/pflag"
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)
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var (
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noOutput = false
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url = "http://localhost:5572/"
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jsonInput = ""
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authUser = ""
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authPass = ""
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loopback = false
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options []string
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arguments []string
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)
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func init() {
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cmd.Root.AddCommand(commandDefinition)
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cmdFlags := commandDefinition.Flags()
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flags.BoolVarP(cmdFlags, &noOutput, "no-output", "", noOutput, "If set, don't output the JSON result")
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flags.StringVarP(cmdFlags, &url, "url", "", url, "URL to connect to rclone remote control")
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flags.StringVarP(cmdFlags, &jsonInput, "json", "", jsonInput, "Input JSON - use instead of key=value args")
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flags.StringVarP(cmdFlags, &authUser, "user", "", "", "Username to use to rclone remote control")
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flags.StringVarP(cmdFlags, &authPass, "pass", "", "", "Password to use to connect to rclone remote control")
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flags.BoolVarP(cmdFlags, &loopback, "loopback", "", false, "If set connect to this rclone instance not via HTTP")
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flags.StringArrayVarP(cmdFlags, &options, "opt", "o", options, "Option in the form name=value or name placed in the \"opt\" array")
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flags.StringArrayVarP(cmdFlags, &arguments, "arg", "a", arguments, "Argument placed in the \"arg\" array")
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}
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var commandDefinition = &cobra.Command{
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Use: "rc commands parameter",
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Short: `Run a command against a running rclone.`,
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Long: `
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This runs a command against a running rclone. Use the ` + "`--url`" + ` flag to
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specify an non default URL to connect on. This can be either a
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":port" which is taken to mean "http://localhost:port" or a
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"host:port" which is taken to mean "http://host:port"
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A username and password can be passed in with ` + "`--user`" + ` and ` + "`--pass`" + `.
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Note that ` + "`--rc-addr`, `--rc-user`, `--rc-pass`" + ` will be read also for
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` + "`--url`, `--user`, `--pass`" + `.
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Arguments should be passed in as parameter=value.
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The result will be returned as a JSON object by default.
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The ` + "`--json`" + ` parameter can be used to pass in a JSON blob as an input
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instead of key=value arguments. This is the only way of passing in
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more complicated values.
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The ` + "`-o`/`--opt`" + ` option can be used to set a key "opt" with key, value
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options in the form ` + "`-o key=value` or `-o key`" + `. It can be repeated as
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many times as required. This is useful for rc commands which take the
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"opt" parameter which by convention is a dictionary of strings.
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-o key=value -o key2
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Will place this in the "opt" value
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{"key":"value", "key2","")
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The ` + "`-a`/`--arg`" + ` option can be used to set strings in the "arg" value. It
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can be repeated as many times as required. This is useful for rc
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commands which take the "arg" parameter which by convention is a list
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of strings.
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-a value -a value2
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Will place this in the "arg" value
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["value", "value2"]
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Use ` + "`--loopback`" + ` to connect to the rclone instance running ` + "`rclone rc`" + `.
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This is very useful for testing commands without having to run an
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rclone rc server, e.g.:
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rclone rc --loopback operations/about fs=/
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Use ` + "`rclone rc`" + ` to see a list of all possible commands.`,
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Annotations: map[string]string{
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"versionIntroduced": "v1.40",
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},
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Run: func(command *cobra.Command, args []string) {
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cmd.CheckArgs(0, 1e9, command, args)
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cmd.Run(false, false, command, func() error {
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ctx := context.Background()
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parseFlags()
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if len(args) == 0 {
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return list(ctx)
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}
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return run(ctx, args)
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})
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},
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}
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// Parse the flags
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func parseFlags() {
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// set alternates from alternate flags
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setAlternateFlag("rc-addr", &url)
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setAlternateFlag("rc-user", &authUser)
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setAlternateFlag("rc-pass", &authPass)
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// If url is just :port then fix it up
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if strings.HasPrefix(url, ":") {
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url = "localhost" + url
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}
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// if url is just host:port add http://
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if !strings.HasPrefix(url, "http:") && !strings.HasPrefix(url, "https:") {
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url = "http://" + url
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}
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// if url doesn't end with / add it
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if !strings.HasSuffix(url, "/") {
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url += "/"
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}
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}
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// ParseOptions parses a slice of options in the form key=value or key
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// into a map
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func ParseOptions(options []string) (opt map[string]string) {
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opt = make(map[string]string, len(options))
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for _, option := range options {
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equals := strings.IndexRune(option, '=')
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key := option
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value := ""
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if equals >= 0 {
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key = option[:equals]
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value = option[equals+1:]
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}
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opt[key] = value
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}
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return opt
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}
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// If the user set flagName set the output to its value
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func setAlternateFlag(flagName string, output *string) {
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if rcFlag := pflag.Lookup(flagName); rcFlag != nil && rcFlag.Changed {
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*output = rcFlag.Value.String()
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if sliceValue, ok := rcFlag.Value.(pflag.SliceValue); ok {
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stringSlice := sliceValue.GetSlice()
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for _, value := range stringSlice {
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if value != "" {
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*output = value
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break
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}
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}
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}
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}
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}
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// do a call from (path, in) to (out, err).
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//
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// if err is set, out may be a valid error return or it may be nil
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func doCall(ctx context.Context, path string, in rc.Params) (out rc.Params, err error) {
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// If loopback set, short circuit HTTP request
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if loopback {
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call := rc.Calls.Get(path)
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if call == nil {
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return nil, fmt.Errorf("method %q not found", path)
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}
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_, out, err := jobs.NewJob(ctx, call.Fn, in)
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if err != nil {
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return nil, fmt.Errorf("loopback call failed: %w", err)
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}
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// Reshape (serialize then deserialize) the data so it is in the form expected
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err = rc.Reshape(&out, out)
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if err != nil {
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return nil, fmt.Errorf("loopback reshape failed: %w", err)
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}
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return out, nil
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}
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// Do HTTP request
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client := fshttp.NewClient(ctx)
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url += path
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data, err := json.Marshal(in)
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if err != nil {
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return nil, fmt.Errorf("failed to encode JSON: %w", err)
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}
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req, err := http.NewRequestWithContext(ctx, "POST", url, bytes.NewBuffer(data))
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if err != nil {
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return nil, fmt.Errorf("failed to make request: %w", err)
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}
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req.Header.Set("Content-Type", "application/json")
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if authUser != "" || authPass != "" {
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req.SetBasicAuth(authUser, authPass)
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}
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resp, err := client.Do(req)
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if err != nil {
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return nil, fmt.Errorf("connection failed: %w", err)
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}
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defer fs.CheckClose(resp.Body, &err)
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if resp.StatusCode != http.StatusOK {
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var body []byte
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body, err = io.ReadAll(resp.Body)
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var bodyString string
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if err == nil {
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bodyString = string(body)
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} else {
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bodyString = err.Error()
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}
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bodyString = strings.TrimSpace(bodyString)
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return nil, fmt.Errorf("failed to read rc response: %s: %s", resp.Status, bodyString)
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}
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// Parse output
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out = make(rc.Params)
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err = json.NewDecoder(resp.Body).Decode(&out)
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if err != nil {
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return nil, fmt.Errorf("failed to decode JSON: %w", err)
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}
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// Check we got 200 OK
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if resp.StatusCode != http.StatusOK {
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err = fmt.Errorf("operation %q failed: %v", path, out["error"])
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}
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return out, err
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}
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// Run the remote control command passed in
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func run(ctx context.Context, args []string) (err error) {
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path := strings.Trim(args[0], "/")
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// parse input
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in := make(rc.Params)
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params := args[1:]
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if jsonInput == "" {
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for _, param := range params {
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equals := strings.IndexRune(param, '=')
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if equals < 0 {
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return fmt.Errorf("no '=' found in parameter %q", param)
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}
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key, value := param[:equals], param[equals+1:]
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in[key] = value
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}
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} else {
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if len(params) > 0 {
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return errors.New("can't use --json and parameters together")
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}
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err = json.Unmarshal([]byte(jsonInput), &in)
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if err != nil {
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return fmt.Errorf("bad --json input: %w", err)
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}
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}
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if len(options) > 0 {
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in["opt"] = ParseOptions(options)
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}
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if len(arguments) > 0 {
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in["arg"] = arguments
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}
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// Do the call
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out, callErr := doCall(ctx, path, in)
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// Write the JSON blob to stdout if required
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if out != nil && !noOutput {
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err := rc.WriteJSON(os.Stdout, out)
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if err != nil {
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return fmt.Errorf("failed to output JSON: %w", err)
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}
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}
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return callErr
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}
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// List the available commands to stdout
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func list(ctx context.Context) error {
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list, err := doCall(ctx, "rc/list", nil)
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if err != nil {
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return fmt.Errorf("failed to list: %w", err)
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}
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commands, ok := list["commands"].([]interface{})
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if !ok {
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return errors.New("bad JSON")
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}
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for _, command := range commands {
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info, ok := command.(map[string]interface{})
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if !ok {
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return errors.New("bad JSON")
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}
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fmt.Printf("### %s: %s {#%s}\n\n", info["Path"], info["Title"], strings.ReplaceAll(info["Path"].(string), "/", "-"))
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fmt.Printf("%s\n\n", info["Help"])
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if authRequired := info["AuthRequired"]; authRequired != nil {
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if authRequired.(bool) {
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fmt.Printf("**Authentication is required for this call.**\n\n")
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}
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}
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}
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return nil
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}
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