Extract basic handlers into unrouted struct
This commit is contained in:
Max Brosnahan
parent
dd6ce92651
commit
b36b5ac3bb
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@ -78,6 +78,9 @@ func main() {
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}
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```
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If you need to customize the GET and DELETE endpoints use
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`tusd.NewUnroutedHandler` instead of `tusd.NewHandler`.
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## Implementing own storages
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The tusd server is built to be as flexible as possible and to allow the use
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@ -2,14 +2,15 @@ package main
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import (
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"flag"
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"github.com/tus/tusd"
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"github.com/tus/tusd/filestore"
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"github.com/tus/tusd/limitedstore"
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"log"
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"net"
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"net/http"
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"os"
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"time"
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"github.com/tus/tusd"
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"github.com/tus/tusd/filestore"
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"github.com/tus/tusd/limitedstore"
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)
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var httpHost string
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614
handler.go
614
handler.go
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@ -1,618 +1,50 @@
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package tusd
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import (
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"encoding/base64"
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"errors"
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"io"
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"log"
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"net/http"
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"net/url"
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"os"
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"regexp"
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"strconv"
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"strings"
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"github.com/bmizerany/pat"
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)
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var reExtractFileID = regexp.MustCompile(`([^/]+)\/?$`)
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var (
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ErrUnsupportedVersion = errors.New("unsupported version")
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ErrMaxSizeExceeded = errors.New("maximum size exceeded")
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ErrInvalidContentType = errors.New("missing or invalid Content-Type header")
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ErrInvalidUploadLength = errors.New("missing or invalid Upload-Length header")
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ErrInvalidOffset = errors.New("missing or invalid Upload-Offset header")
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ErrNotFound = errors.New("upload not found")
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ErrFileLocked = errors.New("file currently locked")
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ErrMismatchOffset = errors.New("mismatched offset")
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ErrSizeExceeded = errors.New("resource's size exceeded")
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ErrNotImplemented = errors.New("feature not implemented")
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ErrUploadNotFinished = errors.New("one of the partial uploads is not finished")
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ErrInvalidConcat = errors.New("invalid Upload-Concat header")
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ErrModifyFinal = errors.New("modifying a final upload is not allowed")
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)
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// HTTP status codes sent in the response when the specific error is returned.
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var ErrStatusCodes = map[error]int{
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ErrUnsupportedVersion: http.StatusPreconditionFailed,
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ErrMaxSizeExceeded: http.StatusRequestEntityTooLarge,
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ErrInvalidContentType: http.StatusBadRequest,
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ErrInvalidUploadLength: http.StatusBadRequest,
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ErrInvalidOffset: http.StatusBadRequest,
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ErrNotFound: http.StatusNotFound,
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ErrFileLocked: 423, // Locked (WebDAV) (RFC 4918)
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ErrMismatchOffset: http.StatusConflict,
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ErrSizeExceeded: http.StatusRequestEntityTooLarge,
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ErrNotImplemented: http.StatusNotImplemented,
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ErrUploadNotFinished: http.StatusBadRequest,
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ErrInvalidConcat: http.StatusBadRequest,
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ErrModifyFinal: http.StatusForbidden,
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}
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type Config struct {
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// DataStore implementation used to store and retrieve the single uploads.
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// Must no be nil.
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DataStore DataStore
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// MaxSize defines how many bytes may be stored in one single upload. If its
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// value is is 0 or smaller no limit will be enforced.
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MaxSize int64
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// BasePath defines the URL path used for handling uploads, e.g. "/files/".
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// If no trailing slash is presented it will be added. You may specify an
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// absolute URL containing a scheme, e.g. "http://tus.io"
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BasePath string
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// Initiate the CompleteUploads channel in the Handler struct in order to
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// be notified about complete uploads
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NotifyCompleteUploads bool
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// Logger the logger to use internally
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Logger *log.Logger
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}
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// Handler is a ready to use handler with routing (using pat)
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type Handler struct {
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config Config
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dataStore DataStore
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isBasePathAbs bool
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basePath string
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unroutedHandler *UnroutedHandler
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routeHandler http.Handler
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locks map[string]bool
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logger *log.Logger
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// For each finished upload the corresponding info object will be sent using
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// this unbuffered channel. The NotifyCompleteUploads property in the Config
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// struct must be set to true in order to work.
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CompleteUploads chan FileInfo
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}
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// Create a new handler using the given configuration.
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// NewHandler creates a routed tus protocol handler. This is the simplest
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// way to use tusd but may not be as configurable as you require. If you are
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// integrating this into an existing app you may like to use tusd.NewHandler
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// instead. Using tusd.NewHandler allows the tus handlers to be combined into
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// your existing router (aka mux) directly. It also allows the GET and DELETE
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// endpoints to be customized. These are not part of the protocol so can be
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// changed depending on your needs.
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func NewHandler(config Config) (*Handler, error) {
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logger := config.Logger
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if logger == nil {
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logger = log.New(os.Stdout, "[tusd] ", 0)
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}
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base := config.BasePath
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uri, err := url.Parse(base)
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handler, err := NewUnroutedHandler(config)
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if err != nil {
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return nil, err
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}
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// Ensure base path ends with slash to remove logic from absFileURL
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if base != "" && string(base[len(base)-1]) != "/" {
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base += "/"
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}
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// Ensure base path begins with slash if not absolute (starts with scheme)
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if !uri.IsAbs() && len(base) > 0 && string(base[0]) != "/" {
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base = "/" + base
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routedHandler := &Handler{
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unroutedHandler: handler,
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CompleteUploads: handler.CompleteUploads,
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}
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mux := pat.New()
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handler := &Handler{
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config: config,
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dataStore: config.DataStore,
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basePath: base,
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isBasePathAbs: uri.IsAbs(),
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routeHandler: mux,
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locks: make(map[string]bool),
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CompleteUploads: make(chan FileInfo),
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logger: logger,
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}
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routedHandler.routeHandler = handler.TusMiddleware(mux)
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mux.Post("", http.HandlerFunc(handler.postFile))
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mux.Head(":id", http.HandlerFunc(handler.headFile))
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mux.Get(":id", http.HandlerFunc(handler.getFile))
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mux.Del(":id", http.HandlerFunc(handler.delFile))
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mux.Add("PATCH", ":id", http.HandlerFunc(handler.patchFile))
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mux.Post("", http.HandlerFunc(handler.PostFile))
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mux.Head(":id", http.HandlerFunc(handler.HeadFile))
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mux.Get(":id", http.HandlerFunc(handler.GetFile))
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mux.Del(":id", http.HandlerFunc(handler.DelFile))
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mux.Add("PATCH", ":id", http.HandlerFunc(handler.PatchFile))
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return handler, nil
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return routedHandler, nil
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}
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// Implement the http.Handler interface.
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func (handler *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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// Allow overriding the HTTP method. The reason for this is
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// that some libraries/environments to not support PATCH and
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// DELETE requests, e.g. Flash in a browser and parts of Java
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if newMethod := r.Header.Get("X-HTTP-Method-Override"); newMethod != "" {
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r.Method = newMethod
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}
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go handler.logger.Println(r.Method, r.URL.Path)
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header := w.Header()
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if origin := r.Header.Get("Origin"); origin != "" {
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header.Set("Access-Control-Allow-Origin", origin)
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if r.Method == "OPTIONS" {
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// Preflight request
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header.Set("Access-Control-Allow-Methods", "POST, GET, HEAD, PATCH, DELETE, OPTIONS")
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header.Set("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Upload-Length, Upload-Offset, Tus-Resumable, Upload-Metadata")
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header.Set("Access-Control-Max-Age", "86400")
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} else {
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// Actual request
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header.Set("Access-Control-Expose-Headers", "Upload-Offset, Location, Upload-Length, Tus-Version, Tus-Resumable, Tus-Max-Size, Tus-Extension, Upload-Metadata")
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}
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}
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// Set current version used by the server
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header.Set("Tus-Resumable", "1.0.0")
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// Add nosniff to all responses https://golang.org/src/net/http/server.go#L1429
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header.Set("X-Content-Type-Options", "nosniff")
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// Set appropriated headers in case of OPTIONS method allowing protocol
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// discovery and end with an 204 No Content
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if r.Method == "OPTIONS" {
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if handler.config.MaxSize > 0 {
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header.Set("Tus-Max-Size", strconv.FormatInt(handler.config.MaxSize, 10))
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}
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header.Set("Tus-Version", "1.0.0")
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header.Set("Tus-Extension", "creation,concatenation,termination")
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w.WriteHeader(http.StatusNoContent)
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return
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}
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// Test if the version sent by the client is supported
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// GET methods are not checked since a browser may visit this URL and does
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// not include this header. This request is not part of the specification.
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if r.Method != "GET" && r.Header.Get("Tus-Resumable") != "1.0.0" {
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handler.sendError(w, r, ErrUnsupportedVersion)
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return
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}
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// Proceed with routing the request
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handler.routeHandler.ServeHTTP(w, r)
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}
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// Create a new file upload using the datastore after validating the length
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// and parsing the metadata.
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func (handler *Handler) postFile(w http.ResponseWriter, r *http.Request) {
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// Parse Upload-Concat header
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isPartial, isFinal, partialUploads, err := parseConcat(r.Header.Get("Upload-Concat"))
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if err != nil {
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handler.sendError(w, r, err)
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return
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}
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// If the upload is a final upload created by concatenation multiple partial
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// uploads the size is sum of all sizes of these files (no need for
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// Upload-Length header)
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var size int64
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if isFinal {
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size, err = handler.sizeOfUploads(partialUploads)
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if err != nil {
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handler.sendError(w, r, err)
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return
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}
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} else {
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size, err = strconv.ParseInt(r.Header.Get("Upload-Length"), 10, 64)
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if err != nil || size < 0 {
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handler.sendError(w, r, ErrInvalidUploadLength)
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return
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}
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}
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// Test whether the size is still allowed
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if handler.config.MaxSize > 0 && size > handler.config.MaxSize {
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handler.sendError(w, r, ErrMaxSizeExceeded)
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return
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}
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// Parse metadata
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meta := parseMeta(r.Header.Get("Upload-Metadata"))
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info := FileInfo{
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Size: size,
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MetaData: meta,
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IsPartial: isPartial,
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IsFinal: isFinal,
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PartialUploads: partialUploads,
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}
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id, err := handler.dataStore.NewUpload(info)
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if err != nil {
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handler.sendError(w, r, err)
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return
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}
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if isFinal {
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if err := handler.fillFinalUpload(id, partialUploads); err != nil {
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handler.sendError(w, r, err)
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return
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}
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}
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url := handler.absFileURL(r, id)
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w.Header().Set("Location", url)
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w.WriteHeader(http.StatusCreated)
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}
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// Returns the length and offset for the HEAD request
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func (handler *Handler) headFile(w http.ResponseWriter, r *http.Request) {
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id := r.URL.Query().Get(":id")
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info, err := handler.dataStore.GetInfo(id)
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if err != nil {
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handler.sendError(w, r, err)
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return
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}
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// Add Upload-Concat header if possible
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if info.IsPartial {
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w.Header().Set("Upload-Concat", "partial")
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}
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if info.IsFinal {
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v := "final;"
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for _, uploadID := range info.PartialUploads {
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v += " " + handler.absFileURL(r, uploadID)
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}
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w.Header().Set("Upload-Concat", v)
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}
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if len(info.MetaData) != 0 {
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w.Header().Set("Upload-Metadata", serializeMeta(info.MetaData))
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}
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w.Header().Set("Cache-Control", "no-store")
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w.Header().Set("Upload-Length", strconv.FormatInt(info.Size, 10))
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w.Header().Set("Upload-Offset", strconv.FormatInt(info.Offset, 10))
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w.WriteHeader(http.StatusNoContent)
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}
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// Add a chunk to an upload. Only allowed if the upload is not locked and enough
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// space is left.
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func (handler *Handler) patchFile(w http.ResponseWriter, r *http.Request) {
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//Check for presence of application/offset+octet-stream
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if r.Header.Get("Content-Type") != "application/offset+octet-stream" {
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handler.sendError(w, r, ErrInvalidContentType)
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return
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}
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//Check for presence of a valid Upload-Offset Header
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offset, err := strconv.ParseInt(r.Header.Get("Upload-Offset"), 10, 64)
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if err != nil || offset < 0 {
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handler.sendError(w, r, ErrInvalidOffset)
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return
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}
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id := r.URL.Query().Get(":id")
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// Ensure file is not locked
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if _, ok := handler.locks[id]; ok {
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handler.sendError(w, r, ErrFileLocked)
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return
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}
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// Lock file for further writes (heads are allowed)
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handler.locks[id] = true
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// File will be unlocked regardless of an error or success
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defer func() {
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delete(handler.locks, id)
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}()
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info, err := handler.dataStore.GetInfo(id)
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if err != nil {
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handler.sendError(w, r, err)
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return
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}
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// Modifying a final upload is not allowed
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if info.IsFinal {
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handler.sendError(w, r, ErrModifyFinal)
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return
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}
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if offset != info.Offset {
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handler.sendError(w, r, ErrMismatchOffset)
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return
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}
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// Get Content-Length if possible
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length := r.ContentLength
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// Test if this upload fits into the file's size
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if offset+length > info.Size {
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handler.sendError(w, r, ErrSizeExceeded)
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return
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}
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maxSize := info.Size - offset
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if length > 0 {
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maxSize = length
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}
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// Limit the
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reader := io.LimitReader(r.Body, maxSize)
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bytesWritten, err := handler.dataStore.WriteChunk(id, offset, reader)
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if err != nil {
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handler.sendError(w, r, err)
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return
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}
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// Send new offset to client
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newOffset := offset + bytesWritten
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w.Header().Set("Upload-Offset", strconv.FormatInt(newOffset, 10))
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// If the upload is completed, send the info out to the channel
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if handler.config.NotifyCompleteUploads && newOffset == info.Size {
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info.Size = newOffset
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handler.CompleteUploads <- info
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}
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w.WriteHeader(http.StatusNoContent)
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}
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// Download a file using a GET request. This is not part of the specification.
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func (handler *Handler) getFile(w http.ResponseWriter, r *http.Request) {
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id := r.URL.Query().Get(":id")
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// Ensure file is not locked
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if _, ok := handler.locks[id]; ok {
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handler.sendError(w, r, ErrFileLocked)
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return
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}
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// Lock file for further writes (heads are allowed)
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handler.locks[id] = true
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// File will be unlocked regardless of an error or success
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defer func() {
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delete(handler.locks, id)
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}()
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info, err := handler.dataStore.GetInfo(id)
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if err != nil {
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handler.sendError(w, r, err)
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return
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}
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// Do not do anything if no data is stored yet.
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if info.Offset == 0 {
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w.WriteHeader(http.StatusNoContent)
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return
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}
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// Get reader
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src, err := handler.dataStore.GetReader(id)
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if err != nil {
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handler.sendError(w, r, err)
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return
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}
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w.Header().Set("Content-Length", strconv.FormatInt(info.Offset, 10))
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w.WriteHeader(http.StatusOK)
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io.Copy(w, src)
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// Try to close the reader if the io.Closer interface is implemented
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if closer, ok := src.(io.Closer); ok {
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closer.Close()
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}
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}
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// Terminate an upload permanently.
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func (handler *Handler) delFile(w http.ResponseWriter, r *http.Request) {
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id := r.URL.Query().Get(":id")
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// Ensure file is not locked
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if _, ok := handler.locks[id]; ok {
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handler.sendError(w, r, ErrFileLocked)
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return
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}
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// Lock file for further writes (heads are allowed)
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handler.locks[id] = true
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// File will be unlocked regardless of an error or success
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defer func() {
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delete(handler.locks, id)
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}()
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err := handler.dataStore.Terminate(id)
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if err != nil {
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handler.sendError(w, r, err)
|
||||
return
|
||||
}
|
||||
|
||||
w.WriteHeader(http.StatusNoContent)
|
||||
}
|
||||
|
||||
// Send the error in the response body. The status code will be looked up in
|
||||
// ErrStatusCodes. If none is found 500 Internal Error will be used.
|
||||
func (handler *Handler) sendError(w http.ResponseWriter, r *http.Request, err error) {
|
||||
// Interpret os.ErrNotExist as 404 Not Found
|
||||
if os.IsNotExist(err) {
|
||||
err = ErrNotFound
|
||||
}
|
||||
|
||||
status, ok := ErrStatusCodes[err]
|
||||
if !ok {
|
||||
status = 500
|
||||
}
|
||||
|
||||
reason := err.Error() + "\n"
|
||||
|
||||
// Avoid sending a response to a HEAD request. They expect an empty body.
|
||||
if r.Method == "HEAD" {
|
||||
reason = ""
|
||||
}
|
||||
|
||||
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
|
||||
w.Header().Set("Content-Length", strconv.Itoa(len(reason)))
|
||||
w.WriteHeader(status)
|
||||
w.Write([]byte(reason))
|
||||
}
|
||||
|
||||
// Make an absolute URLs to the given upload id. If the base path is absolute
|
||||
// it will be prepended else the host and protocol from the request is used.
|
||||
func (handler *Handler) absFileURL(r *http.Request, id string) string {
|
||||
if handler.isBasePathAbs {
|
||||
return handler.basePath + id
|
||||
}
|
||||
|
||||
// Read origin and protocol from request
|
||||
url := "http://"
|
||||
if r.TLS != nil {
|
||||
url = "https://"
|
||||
}
|
||||
|
||||
url += r.Host + handler.basePath + id
|
||||
|
||||
return url
|
||||
}
|
||||
|
||||
// The get sum of all sizes for a list of upload ids while checking whether
|
||||
// all of these uploads are finished yet. This is used to calculate the size
|
||||
// of a final resource.
|
||||
func (handler *Handler) sizeOfUploads(ids []string) (size int64, err error) {
|
||||
for _, id := range ids {
|
||||
info, err := handler.dataStore.GetInfo(id)
|
||||
if err != nil {
|
||||
return size, err
|
||||
}
|
||||
|
||||
if info.Offset != info.Size {
|
||||
err = ErrUploadNotFinished
|
||||
return size, err
|
||||
}
|
||||
|
||||
size += info.Size
|
||||
}
|
||||
|
||||
return
|
||||
}
|
||||
|
||||
// Fill an empty upload with the content of the uploads by their ids. The data
|
||||
// will be written in the order as they appear in the slice
|
||||
func (handler *Handler) fillFinalUpload(id string, uploads []string) error {
|
||||
readers := make([]io.Reader, len(uploads))
|
||||
|
||||
for index, uploadID := range uploads {
|
||||
reader, err := handler.dataStore.GetReader(uploadID)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
readers[index] = reader
|
||||
}
|
||||
|
||||
reader := io.MultiReader(readers...)
|
||||
_, err := handler.dataStore.WriteChunk(id, 0, reader)
|
||||
|
||||
return err
|
||||
}
|
||||
|
||||
// Parse the Upload-Metadata header as defined in the File Creation extension.
|
||||
// e.g. Upload-Metadata: name bHVucmpzLnBuZw==,type aW1hZ2UvcG5n
|
||||
func parseMeta(header string) map[string]string {
|
||||
meta := make(map[string]string)
|
||||
|
||||
for _, element := range strings.Split(header, ",") {
|
||||
element := strings.TrimSpace(element)
|
||||
|
||||
parts := strings.Split(element, " ")
|
||||
|
||||
// Do not continue with this element if no key and value or presented
|
||||
if len(parts) != 2 {
|
||||
continue
|
||||
}
|
||||
|
||||
// Ignore corrent element if the value is no valid base64
|
||||
key := parts[0]
|
||||
value, err := base64.StdEncoding.DecodeString(parts[1])
|
||||
if err != nil {
|
||||
continue
|
||||
}
|
||||
|
||||
meta[key] = string(value)
|
||||
}
|
||||
|
||||
return meta
|
||||
}
|
||||
|
||||
// Serialize a map of strings into the Upload-Metadata header format used in the
|
||||
// response for HEAD requests.
|
||||
// e.g. Upload-Metadata: name bHVucmpzLnBuZw==,type aW1hZ2UvcG5n
|
||||
func serializeMeta(meta map[string]string) string {
|
||||
header := ""
|
||||
for key, value := range meta {
|
||||
valueBase64 := base64.StdEncoding.EncodeToString([]byte(value))
|
||||
header += key + " " + valueBase64 + ","
|
||||
}
|
||||
|
||||
// Remove trailing comma
|
||||
if len(header) > 0 {
|
||||
header = header[:len(header)-1]
|
||||
}
|
||||
|
||||
return header
|
||||
}
|
||||
|
||||
// Parse the Upload-Concat header, e.g.
|
||||
// Upload-Concat: partial
|
||||
// Upload-Concat: final; http://tus.io/files/a /files/b/
|
||||
func parseConcat(header string) (isPartial bool, isFinal bool, partialUploads []string, err error) {
|
||||
if len(header) == 0 {
|
||||
return
|
||||
}
|
||||
|
||||
if header == "partial" {
|
||||
isPartial = true
|
||||
return
|
||||
}
|
||||
|
||||
l := len("final; ")
|
||||
if strings.HasPrefix(header, "final; ") && len(header) > l {
|
||||
isFinal = true
|
||||
|
||||
list := strings.Split(header[l:], " ")
|
||||
for _, value := range list {
|
||||
value := strings.TrimSpace(value)
|
||||
if value == "" {
|
||||
continue
|
||||
}
|
||||
|
||||
// Extract ids out of URL
|
||||
result := reExtractFileID.FindStringSubmatch(value)
|
||||
if len(result) != 2 {
|
||||
err = ErrInvalidConcat
|
||||
return
|
||||
}
|
||||
|
||||
partialUploads = append(partialUploads, result[1])
|
||||
}
|
||||
}
|
||||
|
||||
// If no valid partial upload ids are extracted this is not a final upload.
|
||||
if len(partialUploads) == 0 {
|
||||
isFinal = false
|
||||
err = ErrInvalidConcat
|
||||
}
|
||||
|
||||
return
|
||||
// ServeHTTP Implements the http.Handler interface.
|
||||
func (rHandler *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
||||
rHandler.routeHandler.ServeHTTP(w, r)
|
||||
}
|
||||
|
|
|
|||
|
|
@ -0,0 +1,626 @@
|
|||
package tusd
|
||||
|
||||
import (
|
||||
"encoding/base64"
|
||||
"errors"
|
||||
"io"
|
||||
"log"
|
||||
"net/http"
|
||||
"net/url"
|
||||
"os"
|
||||
"regexp"
|
||||
"strconv"
|
||||
"strings"
|
||||
)
|
||||
|
||||
var reExtractFileID = regexp.MustCompile(`([^/]+)\/?$`)
|
||||
|
||||
var (
|
||||
ErrUnsupportedVersion = errors.New("unsupported version")
|
||||
ErrMaxSizeExceeded = errors.New("maximum size exceeded")
|
||||
ErrInvalidContentType = errors.New("missing or invalid Content-Type header")
|
||||
ErrInvalidUploadLength = errors.New("missing or invalid Upload-Length header")
|
||||
ErrInvalidOffset = errors.New("missing or invalid Upload-Offset header")
|
||||
ErrNotFound = errors.New("upload not found")
|
||||
ErrFileLocked = errors.New("file currently locked")
|
||||
ErrMismatchOffset = errors.New("mismatched offset")
|
||||
ErrSizeExceeded = errors.New("resource's size exceeded")
|
||||
ErrNotImplemented = errors.New("feature not implemented")
|
||||
ErrUploadNotFinished = errors.New("one of the partial uploads is not finished")
|
||||
ErrInvalidConcat = errors.New("invalid Upload-Concat header")
|
||||
ErrModifyFinal = errors.New("modifying a final upload is not allowed")
|
||||
)
|
||||
|
||||
// HTTP status codes sent in the response when the specific error is returned.
|
||||
var ErrStatusCodes = map[error]int{
|
||||
ErrUnsupportedVersion: http.StatusPreconditionFailed,
|
||||
ErrMaxSizeExceeded: http.StatusRequestEntityTooLarge,
|
||||
ErrInvalidContentType: http.StatusBadRequest,
|
||||
ErrInvalidUploadLength: http.StatusBadRequest,
|
||||
ErrInvalidOffset: http.StatusBadRequest,
|
||||
ErrNotFound: http.StatusNotFound,
|
||||
ErrFileLocked: 423, // Locked (WebDAV) (RFC 4918)
|
||||
ErrMismatchOffset: http.StatusConflict,
|
||||
ErrSizeExceeded: http.StatusRequestEntityTooLarge,
|
||||
ErrNotImplemented: http.StatusNotImplemented,
|
||||
ErrUploadNotFinished: http.StatusBadRequest,
|
||||
ErrInvalidConcat: http.StatusBadRequest,
|
||||
ErrModifyFinal: http.StatusForbidden,
|
||||
}
|
||||
|
||||
// Config provides a way to configure the Handler depending on your needs.
|
||||
type Config struct {
|
||||
// DataStore implementation used to store and retrieve the single uploads.
|
||||
// Must no be nil.
|
||||
DataStore DataStore
|
||||
// MaxSize defines how many bytes may be stored in one single upload. If its
|
||||
// value is is 0 or smaller no limit will be enforced.
|
||||
MaxSize int64
|
||||
// BasePath defines the URL path used for handling uploads, e.g. "/files/".
|
||||
// If no trailing slash is presented it will be added. You may specify an
|
||||
// absolute URL containing a scheme, e.g. "http://tus.io"
|
||||
BasePath string
|
||||
// Initiate the CompleteUploads channel in the Handler struct in order to
|
||||
// be notified about complete uploads
|
||||
NotifyCompleteUploads bool
|
||||
// Logger the logger to use internally
|
||||
Logger *log.Logger
|
||||
}
|
||||
|
||||
// UnroutedHandler exposes methods to handle requests as part of the tus protocol.
|
||||
// These are PostFile and PatchFile. It also includes GetFile and DelFile
|
||||
// however these are part of the spec. They are provided for convenience.
|
||||
type UnroutedHandler struct {
|
||||
config Config
|
||||
dataStore DataStore
|
||||
isBasePathAbs bool
|
||||
basePath string
|
||||
locks map[string]bool
|
||||
logger *log.Logger
|
||||
|
||||
// For each finished upload the corresponding info object will be sent using
|
||||
// this unbuffered channel. The NotifyCompleteUploads property in the Config
|
||||
// struct must be set to true in order to work.
|
||||
CompleteUploads chan FileInfo
|
||||
}
|
||||
|
||||
// NewUnroutedHandler creates a new handler without routing using the given
|
||||
// configuration. It exposes the http handlers which need to be combined with
|
||||
// a router (aka mux) of your choice. If you are looking for preconfigured
|
||||
// handler see NewHandler.
|
||||
func NewUnroutedHandler(config Config) (*UnroutedHandler, error) {
|
||||
logger := config.Logger
|
||||
if logger == nil {
|
||||
logger = log.New(os.Stdout, "[tusd] ", 0)
|
||||
}
|
||||
base := config.BasePath
|
||||
uri, err := url.Parse(base)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// Ensure base path ends with slash to remove logic from absFileURL
|
||||
if base != "" && string(base[len(base)-1]) != "/" {
|
||||
base += "/"
|
||||
}
|
||||
|
||||
// Ensure base path begins with slash if not absolute (starts with scheme)
|
||||
if !uri.IsAbs() && len(base) > 0 && string(base[0]) != "/" {
|
||||
base = "/" + base
|
||||
}
|
||||
|
||||
handler := &UnroutedHandler{
|
||||
config: config,
|
||||
dataStore: config.DataStore,
|
||||
basePath: base,
|
||||
isBasePathAbs: uri.IsAbs(),
|
||||
locks: make(map[string]bool),
|
||||
CompleteUploads: make(chan FileInfo),
|
||||
logger: logger,
|
||||
}
|
||||
|
||||
return handler, nil
|
||||
}
|
||||
|
||||
// TusMiddleware checks various aspects of the request and ensures that it
|
||||
// conforms with the spec. Also handles method overriding for clients which
|
||||
// cannot make PATCH AND DELETE requests. If you are using the tusd handlers
|
||||
// directly you will need to wrap at least the POST and PATCH endpoints in
|
||||
// this middleware.
|
||||
func (handler *UnroutedHandler) TusMiddleware(h http.Handler) http.Handler {
|
||||
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
||||
// Allow overriding the HTTP method. The reason for this is
|
||||
// that some libraries/environments to not support PATCH and
|
||||
// DELETE requests, e.g. Flash in a browser and parts of Java
|
||||
if newMethod := r.Header.Get("X-HTTP-Method-Override"); newMethod != "" {
|
||||
r.Method = newMethod
|
||||
}
|
||||
|
||||
go handler.logger.Println(r.Method, r.URL.Path)
|
||||
|
||||
header := w.Header()
|
||||
|
||||
if origin := r.Header.Get("Origin"); origin != "" {
|
||||
header.Set("Access-Control-Allow-Origin", origin)
|
||||
|
||||
if r.Method == "OPTIONS" {
|
||||
// Preflight request
|
||||
header.Set("Access-Control-Allow-Methods", "POST, GET, HEAD, PATCH, DELETE, OPTIONS")
|
||||
header.Set("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Upload-Length, Upload-Offset, Tus-Resumable, Upload-Metadata")
|
||||
header.Set("Access-Control-Max-Age", "86400")
|
||||
|
||||
} else {
|
||||
// Actual request
|
||||
header.Set("Access-Control-Expose-Headers", "Upload-Offset, Location, Upload-Length, Tus-Version, Tus-Resumable, Tus-Max-Size, Tus-Extension, Upload-Metadata")
|
||||
}
|
||||
}
|
||||
|
||||
// Set current version used by the server
|
||||
header.Set("Tus-Resumable", "1.0.0")
|
||||
|
||||
// Add nosniff to all responses https://golang.org/src/net/http/server.go#L1429
|
||||
header.Set("X-Content-Type-Options", "nosniff")
|
||||
|
||||
// Set appropriated headers in case of OPTIONS method allowing protocol
|
||||
// discovery and end with an 204 No Content
|
||||
if r.Method == "OPTIONS" {
|
||||
if handler.config.MaxSize > 0 {
|
||||
header.Set("Tus-Max-Size", strconv.FormatInt(handler.config.MaxSize, 10))
|
||||
}
|
||||
|
||||
header.Set("Tus-Version", "1.0.0")
|
||||
header.Set("Tus-Extension", "creation,concatenation,termination")
|
||||
|
||||
w.WriteHeader(http.StatusNoContent)
|
||||
return
|
||||
}
|
||||
|
||||
// Test if the version sent by the client is supported
|
||||
// GET methods are not checked since a browser may visit this URL and does
|
||||
// not include this header. This request is not part of the specification.
|
||||
if r.Method != "GET" && r.Header.Get("Tus-Resumable") != "1.0.0" {
|
||||
handler.sendError(w, r, ErrUnsupportedVersion)
|
||||
return
|
||||
}
|
||||
|
||||
// Proceed with routing the request
|
||||
h.ServeHTTP(w, r)
|
||||
})
|
||||
}
|
||||
|
||||
// PostFile creates a new file upload using the datastore after validating the
|
||||
// length and parsing the metadata.
|
||||
func (handler *UnroutedHandler) PostFile(w http.ResponseWriter, r *http.Request) {
|
||||
// Parse Upload-Concat header
|
||||
isPartial, isFinal, partialUploads, err := parseConcat(r.Header.Get("Upload-Concat"))
|
||||
if err != nil {
|
||||
handler.sendError(w, r, err)
|
||||
return
|
||||
}
|
||||
|
||||
// If the upload is a final upload created by concatenation multiple partial
|
||||
// uploads the size is sum of all sizes of these files (no need for
|
||||
// Upload-Length header)
|
||||
var size int64
|
||||
if isFinal {
|
||||
size, err = handler.sizeOfUploads(partialUploads)
|
||||
if err != nil {
|
||||
handler.sendError(w, r, err)
|
||||
return
|
||||
}
|
||||
} else {
|
||||
size, err = strconv.ParseInt(r.Header.Get("Upload-Length"), 10, 64)
|
||||
if err != nil || size < 0 {
|
||||
handler.sendError(w, r, ErrInvalidUploadLength)
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
// Test whether the size is still allowed
|
||||
if handler.config.MaxSize > 0 && size > handler.config.MaxSize {
|
||||
handler.sendError(w, r, ErrMaxSizeExceeded)
|
||||
return
|
||||
}
|
||||
|
||||
// Parse metadata
|
||||
meta := parseMeta(r.Header.Get("Upload-Metadata"))
|
||||
|
||||
info := FileInfo{
|
||||
Size: size,
|
||||
MetaData: meta,
|
||||
IsPartial: isPartial,
|
||||
IsFinal: isFinal,
|
||||
PartialUploads: partialUploads,
|
||||
}
|
||||
|
||||
id, err := handler.dataStore.NewUpload(info)
|
||||
if err != nil {
|
||||
handler.sendError(w, r, err)
|
||||
return
|
||||
}
|
||||
|
||||
if isFinal {
|
||||
if err := handler.fillFinalUpload(id, partialUploads); err != nil {
|
||||
handler.sendError(w, r, err)
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
url := handler.absFileURL(r, id)
|
||||
w.Header().Set("Location", url)
|
||||
w.WriteHeader(http.StatusCreated)
|
||||
}
|
||||
|
||||
// HeadFile returns the length and offset for the HEAD request
|
||||
func (handler *UnroutedHandler) HeadFile(w http.ResponseWriter, r *http.Request) {
|
||||
|
||||
id := r.URL.Query().Get(":id")
|
||||
info, err := handler.dataStore.GetInfo(id)
|
||||
if err != nil {
|
||||
handler.sendError(w, r, err)
|
||||
return
|
||||
}
|
||||
|
||||
// Add Upload-Concat header if possible
|
||||
if info.IsPartial {
|
||||
w.Header().Set("Upload-Concat", "partial")
|
||||
}
|
||||
|
||||
if info.IsFinal {
|
||||
v := "final;"
|
||||
for _, uploadID := range info.PartialUploads {
|
||||
v += " " + handler.absFileURL(r, uploadID)
|
||||
}
|
||||
w.Header().Set("Upload-Concat", v)
|
||||
}
|
||||
|
||||
if len(info.MetaData) != 0 {
|
||||
w.Header().Set("Upload-Metadata", serializeMeta(info.MetaData))
|
||||
}
|
||||
|
||||
w.Header().Set("Cache-Control", "no-store")
|
||||
w.Header().Set("Upload-Length", strconv.FormatInt(info.Size, 10))
|
||||
w.Header().Set("Upload-Offset", strconv.FormatInt(info.Offset, 10))
|
||||
w.WriteHeader(http.StatusNoContent)
|
||||
}
|
||||
|
||||
// PatchFile adds a chunk to an upload. Only allowed if the upload is not
|
||||
// locked and enough space is left.
|
||||
func (handler *UnroutedHandler) PatchFile(w http.ResponseWriter, r *http.Request) {
|
||||
|
||||
//Check for presence of application/offset+octet-stream
|
||||
if r.Header.Get("Content-Type") != "application/offset+octet-stream" {
|
||||
handler.sendError(w, r, ErrInvalidContentType)
|
||||
return
|
||||
}
|
||||
|
||||
//Check for presence of a valid Upload-Offset Header
|
||||
offset, err := strconv.ParseInt(r.Header.Get("Upload-Offset"), 10, 64)
|
||||
if err != nil || offset < 0 {
|
||||
handler.sendError(w, r, ErrInvalidOffset)
|
||||
return
|
||||
}
|
||||
|
||||
id := extractIDFromPath(r.URL.Path)
|
||||
|
||||
// Ensure file is not locked
|
||||
if _, ok := handler.locks[id]; ok {
|
||||
handler.sendError(w, r, ErrFileLocked)
|
||||
return
|
||||
}
|
||||
|
||||
// Lock file for further writes (heads are allowed)
|
||||
handler.locks[id] = true
|
||||
|
||||
// File will be unlocked regardless of an error or success
|
||||
defer func() {
|
||||
delete(handler.locks, id)
|
||||
}()
|
||||
|
||||
info, err := handler.dataStore.GetInfo(id)
|
||||
if err != nil {
|
||||
handler.sendError(w, r, err)
|
||||
return
|
||||
}
|
||||
|
||||
// Modifying a final upload is not allowed
|
||||
if info.IsFinal {
|
||||
handler.sendError(w, r, ErrModifyFinal)
|
||||
return
|
||||
}
|
||||
|
||||
if offset != info.Offset {
|
||||
handler.sendError(w, r, ErrMismatchOffset)
|
||||
return
|
||||
}
|
||||
|
||||
// Get Content-Length if possible
|
||||
length := r.ContentLength
|
||||
|
||||
// Test if this upload fits into the file's size
|
||||
if offset+length > info.Size {
|
||||
handler.sendError(w, r, ErrSizeExceeded)
|
||||
return
|
||||
}
|
||||
|
||||
maxSize := info.Size - offset
|
||||
if length > 0 {
|
||||
maxSize = length
|
||||
}
|
||||
|
||||
// Limit the
|
||||
reader := io.LimitReader(r.Body, maxSize)
|
||||
|
||||
bytesWritten, err := handler.dataStore.WriteChunk(id, offset, reader)
|
||||
if err != nil {
|
||||
handler.sendError(w, r, err)
|
||||
return
|
||||
}
|
||||
|
||||
// Send new offset to client
|
||||
newOffset := offset + bytesWritten
|
||||
w.Header().Set("Upload-Offset", strconv.FormatInt(newOffset, 10))
|
||||
|
||||
// If the upload is completed, send the info out to the channel
|
||||
if handler.config.NotifyCompleteUploads && newOffset == info.Size {
|
||||
info.Size = newOffset
|
||||
handler.CompleteUploads <- info
|
||||
}
|
||||
|
||||
w.WriteHeader(http.StatusNoContent)
|
||||
}
|
||||
|
||||
// GetFile handles requests to download a file using a GET request. This is not
|
||||
// part of the specification.
|
||||
func (handler *UnroutedHandler) GetFile(w http.ResponseWriter, r *http.Request) {
|
||||
id := extractIDFromPath(r.URL.Path)
|
||||
|
||||
// Ensure file is not locked
|
||||
if _, ok := handler.locks[id]; ok {
|
||||
handler.sendError(w, r, ErrFileLocked)
|
||||
return
|
||||
}
|
||||
|
||||
// Lock file for further writes (heads are allowed)
|
||||
handler.locks[id] = true
|
||||
|
||||
// File will be unlocked regardless of an error or success
|
||||
defer func() {
|
||||
delete(handler.locks, id)
|
||||
}()
|
||||
|
||||
info, err := handler.dataStore.GetInfo(id)
|
||||
if err != nil {
|
||||
handler.sendError(w, r, err)
|
||||
return
|
||||
}
|
||||
|
||||
// Do not do anything if no data is stored yet.
|
||||
if info.Offset == 0 {
|
||||
w.WriteHeader(http.StatusNoContent)
|
||||
return
|
||||
}
|
||||
|
||||
// Get reader
|
||||
src, err := handler.dataStore.GetReader(id)
|
||||
if err != nil {
|
||||
handler.sendError(w, r, err)
|
||||
return
|
||||
}
|
||||
|
||||
w.Header().Set("Content-Length", strconv.FormatInt(info.Offset, 10))
|
||||
w.WriteHeader(http.StatusOK)
|
||||
io.Copy(w, src)
|
||||
|
||||
// Try to close the reader if the io.Closer interface is implemented
|
||||
if closer, ok := src.(io.Closer); ok {
|
||||
closer.Close()
|
||||
}
|
||||
}
|
||||
|
||||
// DelFile terminates an upload permanently.
|
||||
func (handler *UnroutedHandler) DelFile(w http.ResponseWriter, r *http.Request) {
|
||||
id := extractIDFromPath(r.URL.Path)
|
||||
|
||||
// Ensure file is not locked
|
||||
if _, ok := handler.locks[id]; ok {
|
||||
handler.sendError(w, r, ErrFileLocked)
|
||||
return
|
||||
}
|
||||
|
||||
// Lock file for further writes (heads are allowed)
|
||||
handler.locks[id] = true
|
||||
|
||||
// File will be unlocked regardless of an error or success
|
||||
defer func() {
|
||||
delete(handler.locks, id)
|
||||
}()
|
||||
|
||||
err := handler.dataStore.Terminate(id)
|
||||
if err != nil {
|
||||
handler.sendError(w, r, err)
|
||||
return
|
||||
}
|
||||
|
||||
w.WriteHeader(http.StatusNoContent)
|
||||
}
|
||||
|
||||
// Send the error in the response body. The status code will be looked up in
|
||||
// ErrStatusCodes. If none is found 500 Internal Error will be used.
|
||||
func (handler *UnroutedHandler) sendError(w http.ResponseWriter, r *http.Request, err error) {
|
||||
// Interpret os.ErrNotExist as 404 Not Found
|
||||
if os.IsNotExist(err) {
|
||||
err = ErrNotFound
|
||||
}
|
||||
|
||||
status, ok := ErrStatusCodes[err]
|
||||
if !ok {
|
||||
status = 500
|
||||
}
|
||||
|
||||
reason := err.Error() + "\n"
|
||||
if r.Method == "HEAD" {
|
||||
reason = ""
|
||||
}
|
||||
|
||||
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
|
||||
w.Header().Set("Content-Length", strconv.Itoa(len(reason)))
|
||||
w.WriteHeader(status)
|
||||
w.Write([]byte(reason))
|
||||
}
|
||||
|
||||
// Make an absolute URLs to the given upload id. If the base path is absolute
|
||||
// it will be prepended else the host and protocol from the request is used.
|
||||
func (handler *UnroutedHandler) absFileURL(r *http.Request, id string) string {
|
||||
if handler.isBasePathAbs {
|
||||
return handler.basePath + id
|
||||
}
|
||||
|
||||
// Read origin and protocol from request
|
||||
url := "http://"
|
||||
if r.TLS != nil {
|
||||
url = "https://"
|
||||
}
|
||||
|
||||
url += r.Host + handler.basePath + id
|
||||
|
||||
return url
|
||||
}
|
||||
|
||||
// The get sum of all sizes for a list of upload ids while checking whether
|
||||
// all of these uploads are finished yet. This is used to calculate the size
|
||||
// of a final resource.
|
||||
func (handler *UnroutedHandler) sizeOfUploads(ids []string) (size int64, err error) {
|
||||
for _, id := range ids {
|
||||
info, err := handler.dataStore.GetInfo(id)
|
||||
if err != nil {
|
||||
return size, err
|
||||
}
|
||||
|
||||
if info.Offset != info.Size {
|
||||
err = ErrUploadNotFinished
|
||||
return size, err
|
||||
}
|
||||
|
||||
size += info.Size
|
||||
}
|
||||
|
||||
return
|
||||
}
|
||||
|
||||
// Fill an empty upload with the content of the uploads by their ids. The data
|
||||
// will be written in the order as they appear in the slice
|
||||
func (handler *UnroutedHandler) fillFinalUpload(id string, uploads []string) error {
|
||||
readers := make([]io.Reader, len(uploads))
|
||||
|
||||
for index, uploadID := range uploads {
|
||||
reader, err := handler.dataStore.GetReader(uploadID)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
readers[index] = reader
|
||||
}
|
||||
|
||||
reader := io.MultiReader(readers...)
|
||||
_, err := handler.dataStore.WriteChunk(id, 0, reader)
|
||||
|
||||
return err
|
||||
}
|
||||
|
||||
// Parse the Upload-Metadata header as defined in the File Creation extension.
|
||||
// e.g. Upload-Metadata: name bHVucmpzLnBuZw==,type aW1hZ2UvcG5n
|
||||
func parseMeta(header string) map[string]string {
|
||||
meta := make(map[string]string)
|
||||
|
||||
for _, element := range strings.Split(header, ",") {
|
||||
element := strings.TrimSpace(element)
|
||||
|
||||
parts := strings.Split(element, " ")
|
||||
|
||||
// Do not continue with this element if no key and value or presented
|
||||
if len(parts) != 2 {
|
||||
continue
|
||||
}
|
||||
|
||||
// Ignore corrent element if the value is no valid base64
|
||||
key := parts[0]
|
||||
value, err := base64.StdEncoding.DecodeString(parts[1])
|
||||
if err != nil {
|
||||
continue
|
||||
}
|
||||
|
||||
meta[key] = string(value)
|
||||
}
|
||||
|
||||
return meta
|
||||
}
|
||||
|
||||
// Serialize a map of strings into the Upload-Metadata header format used in the
|
||||
// response for HEAD requests.
|
||||
// e.g. Upload-Metadata: name bHVucmpzLnBuZw==,type aW1hZ2UvcG5n
|
||||
func serializeMeta(meta map[string]string) string {
|
||||
header := ""
|
||||
for key, value := range meta {
|
||||
valueBase64 := base64.StdEncoding.EncodeToString([]byte(value))
|
||||
header += key + " " + valueBase64 + ","
|
||||
}
|
||||
|
||||
// Remove trailing comma
|
||||
if len(header) > 0 {
|
||||
header = header[:len(header)-1]
|
||||
}
|
||||
|
||||
return header
|
||||
}
|
||||
|
||||
// Parse the Upload-Concat header, e.g.
|
||||
// Upload-Concat: partial
|
||||
// Upload-Concat: final; http://tus.io/files/a /files/b/
|
||||
func parseConcat(header string) (isPartial bool, isFinal bool, partialUploads []string, err error) {
|
||||
if len(header) == 0 {
|
||||
return
|
||||
}
|
||||
|
||||
if header == "partial" {
|
||||
isPartial = true
|
||||
return
|
||||
}
|
||||
|
||||
l := len("final; ")
|
||||
if strings.HasPrefix(header, "final; ") && len(header) > l {
|
||||
isFinal = true
|
||||
|
||||
list := strings.Split(header[l:], " ")
|
||||
for _, value := range list {
|
||||
value := strings.TrimSpace(value)
|
||||
if value == "" {
|
||||
continue
|
||||
}
|
||||
|
||||
id := extractIDFromPath(value)
|
||||
if id == "" {
|
||||
err = ErrInvalidConcat
|
||||
return
|
||||
}
|
||||
|
||||
partialUploads = append(partialUploads, id)
|
||||
}
|
||||
}
|
||||
|
||||
// If no valid partial upload ids are extracted this is not a final upload.
|
||||
if len(partialUploads) == 0 {
|
||||
isFinal = false
|
||||
err = ErrInvalidConcat
|
||||
}
|
||||
|
||||
return
|
||||
}
|
||||
|
||||
// extractIDFromPath pulls the last segment from the url provided
|
||||
func extractIDFromPath(url string) string {
|
||||
result := reExtractFileID.FindStringSubmatch(url)
|
||||
if len(result) != 2 {
|
||||
return ""
|
||||
}
|
||||
return result[1]
|
||||
}
|
||||
Loading…
Reference in New Issue