import (
"fmt"
+ "html"
"io"
"mime"
"net/http"
+ "net/url"
"os"
+ "regexp"
+ "strconv"
"strings"
+ "sync"
"git.curoverse.com/arvados.git/sdk/go/arvadosclient"
"git.curoverse.com/arvados.git/sdk/go/auth"
"git.curoverse.com/arvados.git/sdk/go/keepclient"
)
-var clientPool = arvadosclient.MakeClientPool()
+type handler struct {
+ Config *Config
+ clientPool *arvadosclient.ClientPool
+ setupOnce sync.Once
+}
-var anonymousTokens []string
+// parseCollectionIDFromDNSName returns a UUID or PDH if s begins with
+// a UUID or URL-encoded PDH; otherwise "".
+func parseCollectionIDFromDNSName(s string) string {
+ // Strip domain.
+ if i := strings.IndexRune(s, '.'); i >= 0 {
+ s = s[:i]
+ }
+ // Names like {uuid}--collections.example.com serve the same
+ // purpose as {uuid}.collections.example.com but can reduce
+ // cost/effort of using [additional] wildcard certificates.
+ if i := strings.Index(s, "--"); i >= 0 {
+ s = s[:i]
+ }
+ if arvadosclient.UUIDMatch(s) {
+ return s
+ }
+ if pdh := strings.Replace(s, "-", "+", 1); arvadosclient.PDHMatch(pdh) {
+ return pdh
+ }
+ return ""
+}
+
+var urlPDHDecoder = strings.NewReplacer(" ", "+", "-", "+")
-type handler struct{}
+// parseCollectionIDFromURL returns a UUID or PDH if s is a UUID or a
+// PDH (even if it is a PDH with "+" replaced by " " or "-");
+// otherwise "".
+func parseCollectionIDFromURL(s string) string {
+ if arvadosclient.UUIDMatch(s) {
+ return s
+ }
+ if pdh := urlPDHDecoder.Replace(s); arvadosclient.PDHMatch(pdh) {
+ return pdh
+ }
+ return ""
+}
-func init() {
- // TODO(TC): Get anonymousTokens from flags
- anonymousTokens = []string{}
+func (h *handler) setup() {
+ h.clientPool = arvadosclient.MakeClientPool()
}
+// ServeHTTP implements http.Handler.
func (h *handler) ServeHTTP(wOrig http.ResponseWriter, r *http.Request) {
- var statusCode int
+ h.setupOnce.Do(h.setup)
+
+ var statusCode = 0
var statusText string
+ remoteAddr := r.RemoteAddr
+ if xff := r.Header.Get("X-Forwarded-For"); xff != "" {
+ remoteAddr = xff + "," + remoteAddr
+ }
+
w := httpserver.WrapResponseWriter(wOrig)
defer func() {
- if statusCode > 0 {
- if w.WroteStatus() == 0 {
- w.WriteHeader(statusCode)
- } else {
- httpserver.Log(r.RemoteAddr, "WARNING",
- fmt.Sprintf("Our status changed from %d to %d after we sent headers", w.WroteStatus(), statusCode))
- }
+ if statusCode == 0 {
+ statusCode = w.WroteStatus()
+ } else if w.WroteStatus() == 0 {
+ w.WriteHeader(statusCode)
+ } else if w.WroteStatus() != statusCode {
+ httpserver.Log(r.RemoteAddr, "WARNING",
+ fmt.Sprintf("Our status changed from %d to %d after we sent headers", w.WroteStatus(), statusCode))
}
if statusText == "" {
statusText = http.StatusText(statusCode)
}
- httpserver.Log(r.RemoteAddr, statusCode, statusText, w.WroteBodyBytes(), r.Method, r.URL.Path)
+ httpserver.Log(remoteAddr, statusCode, statusText, w.WroteBodyBytes(), r.Method, r.Host, r.URL.Path, r.URL.RawQuery)
}()
- arv := clientPool.Get()
- if arv == nil {
- statusCode, statusText = http.StatusInternalServerError, "Pool failed: "+clientPool.Err().Error()
+ if r.Method != "GET" && r.Method != "POST" {
+ statusCode, statusText = http.StatusMethodNotAllowed, r.Method
return
}
- defer clientPool.Put(arv)
- pathParts := strings.Split(r.URL.Path[1:], "/")
+ if r.Header.Get("Origin") != "" {
+ // Allow simple cross-origin requests without user
+ // credentials ("user credentials" as defined by CORS,
+ // i.e., cookies, HTTP authentication, and client-side
+ // SSL certificates. See
+ // http://www.w3.org/TR/cors/#user-credentials).
+ w.Header().Set("Access-Control-Allow-Origin", "*")
+ }
- if len(pathParts) < 3 || pathParts[0] != "collections" || pathParts[1] == "" || pathParts[2] == "" {
- statusCode = http.StatusNotFound
+ arv := h.clientPool.Get()
+ if arv == nil {
+ statusCode, statusText = http.StatusInternalServerError, "Pool failed: "+h.clientPool.Err().Error()
return
}
+ defer h.clientPool.Put(arv)
+
+ pathParts := strings.Split(r.URL.Path[1:], "/")
- var targetId string
+ var targetID string
var targetPath []string
var tokens []string
var reqTokens []string
var pathToken bool
- if len(pathParts) >= 5 && pathParts[1] == "download" {
- // "/collections/download/{id}/{token}/path..." form:
- // Don't use our configured anonymous tokens,
- // Authorization headers, etc. Just use the token in
- // the path.
- targetId = pathParts[2]
- tokens = []string{pathParts[3]}
- targetPath = pathParts[4:]
- pathToken = true
+ var attachment bool
+ credentialsOK := h.Config.TrustAllContent
+
+ if r.Host != "" && r.Host == h.Config.AttachmentOnlyHost {
+ credentialsOK = true
+ attachment = true
+ } else if r.FormValue("disposition") == "attachment" {
+ attachment = true
+ }
+
+ if targetID = parseCollectionIDFromDNSName(r.Host); targetID != "" {
+ // http://ID.collections.example/PATH...
+ credentialsOK = true
+ targetPath = pathParts
+ } else if len(pathParts) >= 2 && strings.HasPrefix(pathParts[0], "c=") {
+ // /c=ID/PATH...
+ targetID = parseCollectionIDFromURL(pathParts[0][2:])
+ targetPath = pathParts[1:]
+ } else if len(pathParts) >= 3 && pathParts[0] == "collections" {
+ if len(pathParts) >= 5 && pathParts[1] == "download" {
+ // /collections/download/ID/TOKEN/PATH...
+ targetID = pathParts[2]
+ tokens = []string{pathParts[3]}
+ targetPath = pathParts[4:]
+ pathToken = true
+ } else {
+ // /collections/ID/PATH...
+ targetID = pathParts[1]
+ tokens = h.Config.AnonymousTokens
+ targetPath = pathParts[2:]
+ }
} else {
- // "/collections/{id}/path..." form
- targetId = pathParts[1]
- reqTokens = auth.NewCredentialsFromHTTPRequest(r).Tokens
- tokens = append(reqTokens, anonymousTokens...)
- targetPath = pathParts[2:]
+ statusCode = http.StatusNotFound
+ return
+ }
+
+ formToken := r.FormValue("api_token")
+ if formToken != "" && r.Header.Get("Origin") != "" && attachment && r.URL.Query().Get("api_token") == "" {
+ // The client provided an explicit token in the POST
+ // body. The Origin header indicates this *might* be
+ // an AJAX request, in which case redirect-with-cookie
+ // won't work: we should just serve the content in the
+ // POST response. This is safe because:
+ //
+ // * We're supplying an attachment, not inline
+ // content, so we don't need to convert the POST to
+ // a GET and avoid the "really resubmit form?"
+ // problem.
+ //
+ // * The token isn't embedded in the URL, so we don't
+ // need to worry about bookmarks and copy/paste.
+ tokens = append(tokens, formToken)
+ } else if formToken != "" {
+ // The client provided an explicit token in the query
+ // string, or a form in POST body. We must put the
+ // token in an HttpOnly cookie, and redirect to the
+ // same URL with the query param redacted and method =
+ // GET.
+
+ if !credentialsOK {
+ // It is not safe to copy the provided token
+ // into a cookie unless the current vhost
+ // (origin) serves only a single collection or
+ // we are in TrustAllContent mode.
+ statusCode = http.StatusBadRequest
+ return
+ }
+
+ // The HttpOnly flag is necessary to prevent
+ // JavaScript code (included in, or loaded by, a page
+ // in the collection being served) from employing the
+ // user's token beyond reading other files in the same
+ // domain, i.e., same collection.
+ //
+ // The 303 redirect is necessary in the case of a GET
+ // request to avoid exposing the token in the Location
+ // bar, and in the case of a POST request to avoid
+ // raising warnings when the user refreshes the
+ // resulting page.
+
+ http.SetCookie(w, &http.Cookie{
+ Name: "arvados_api_token",
+ Value: auth.EncodeTokenCookie([]byte(formToken)),
+ Path: "/",
+ HttpOnly: true,
+ })
+
+ // Propagate query parameters (except api_token) from
+ // the original request.
+ redirQuery := r.URL.Query()
+ redirQuery.Del("api_token")
+
+ redir := (&url.URL{
+ Host: r.Host,
+ Path: r.URL.Path,
+ RawQuery: redirQuery.Encode(),
+ }).String()
+
+ w.Header().Add("Location", redir)
+ statusCode, statusText = http.StatusSeeOther, redir
+ w.WriteHeader(statusCode)
+ io.WriteString(w, `<A href="`)
+ io.WriteString(w, html.EscapeString(redir))
+ io.WriteString(w, `">Continue</A>`)
+ return
+ }
+
+ if tokens == nil && strings.HasPrefix(targetPath[0], "t=") {
+ // http://ID.example/t=TOKEN/PATH...
+ // /c=ID/t=TOKEN/PATH...
+ //
+ // This form must only be used to pass scoped tokens
+ // that give permission for a single collection. See
+ // FormValue case above.
+ tokens = []string{targetPath[0][2:]}
+ pathToken = true
+ targetPath = targetPath[1:]
+ }
+
+ if tokens == nil {
+ if credentialsOK {
+ reqTokens = auth.NewCredentialsFromHTTPRequest(r).Tokens
+ }
+ tokens = append(reqTokens, h.Config.AnonymousTokens...)
+ }
+
+ if len(targetPath) > 0 && targetPath[0] == "_" {
+ // If a collection has a directory called "t=foo" or
+ // "_", it can be served at
+ // //collections.example/_/t=foo/ or
+ // //collections.example/_/_/ respectively:
+ // //collections.example/t=foo/ won't work because
+ // t=foo will be interpreted as a token "foo".
+ targetPath = targetPath[1:]
}
tokenResult := make(map[string]int)
collection := make(map[string]interface{})
found := false
for _, arv.ApiToken = range tokens {
- err := arv.Get("collections", targetId, nil, &collection)
- httpserver.Log(err)
+ err := arv.Get("collections", targetID, nil, &collection)
if err == nil {
// Success
found = true
return
}
if !found {
- if pathToken {
- // The URL is a "secret sharing link", but it
- // didn't work out. Asking the client for
- // additional credentials would just be
- // confusing.
+ if pathToken || !credentialsOK {
+ // Either the URL is a "secret sharing link"
+ // that didn't work out (and asking the client
+ // for additional credentials would just be
+ // confusing), or we don't even accept
+ // credentials at this path.
statusCode = http.StatusNotFound
return
}
// someone trying (anonymously) to download public
// data that has been deleted. Allow a referrer to
// provide this context somehow?
+ w.Header().Add("WWW-Authenticate", "Basic realm=\"collections\"")
statusCode = http.StatusUnauthorized
- w.Header().Add("WWW-Authenticate", "Basic realm=\"dl\"")
return
}
statusCode, statusText = http.StatusInternalServerError, err.Error()
return
}
+ if kc.Client != nil && kc.Client.Transport != nil {
+ // Workaround for https://dev.arvados.org/issues/9005
+ if t, ok := kc.Client.Transport.(*http.Transport); ok {
+ defer t.CloseIdleConnections()
+ }
+ }
rdr, err := kc.CollectionFileReader(collection, filename)
if os.IsNotExist(err) {
statusCode = http.StatusNotFound
}
defer rdr.Close()
- // One or both of these can be -1 if not found:
basenamePos := strings.LastIndex(filename, "/")
+ if basenamePos < 0 {
+ basenamePos = 0
+ }
extPos := strings.LastIndex(filename, ".")
if extPos > basenamePos {
// Now extPos is safely >= 0.
w.Header().Set("Content-Type", t)
}
}
+ if rdr, ok := rdr.(keepclient.ReadCloserWithLen); ok {
+ w.Header().Set("Content-Length", fmt.Sprintf("%d", rdr.Len()))
+ }
- _, err = io.Copy(w, rdr)
+ applyContentDispositionHdr(w, r, filename[basenamePos:], attachment)
+ rangeRdr, statusCode := applyRangeHdr(w, r, rdr)
+
+ w.WriteHeader(statusCode)
+ _, err = io.Copy(w, rangeRdr)
if err != nil {
statusCode, statusText = http.StatusBadGateway, err.Error()
}
}
+
+var rangeRe = regexp.MustCompile(`^bytes=0-([0-9]*)$`)
+
+func applyRangeHdr(w http.ResponseWriter, r *http.Request, rdr keepclient.ReadCloserWithLen) (io.Reader, int) {
+ w.Header().Set("Accept-Ranges", "bytes")
+ hdr := r.Header.Get("Range")
+ fields := rangeRe.FindStringSubmatch(hdr)
+ if fields == nil {
+ return rdr, http.StatusOK
+ }
+ rangeEnd, err := strconv.ParseInt(fields[1], 10, 64)
+ if err != nil {
+ // Empty or too big for int64 == send entire content
+ return rdr, http.StatusOK
+ }
+ if uint64(rangeEnd) >= rdr.Len() {
+ return rdr, http.StatusOK
+ }
+ w.Header().Set("Content-Length", fmt.Sprintf("%d", rangeEnd+1))
+ w.Header().Set("Content-Range", fmt.Sprintf("bytes %d-%d/%d", 0, rangeEnd, rdr.Len()))
+ return &io.LimitedReader{R: rdr, N: rangeEnd + 1}, http.StatusPartialContent
+}
+
+func applyContentDispositionHdr(w http.ResponseWriter, r *http.Request, filename string, isAttachment bool) {
+ disposition := "inline"
+ if isAttachment {
+ disposition = "attachment"
+ }
+ if strings.ContainsRune(r.RequestURI, '?') {
+ // Help the UA realize that the filename is just
+ // "filename.txt", not
+ // "filename.txt?disposition=attachment".
+ //
+ // TODO(TC): Follow advice at RFC 6266 appendix D
+ disposition += "; filename=" + strconv.QuoteToASCII(filename)
+ }
+ if disposition != "inline" {
+ w.Header().Set("Content-Disposition", disposition)
+ }
+}
projects / arvados.git / blobdiff