1 // Copyright (C) The Arvados Authors. All rights reserved.
3 // SPDX-License-Identifier: AGPL-3.0
21 "git.curoverse.com/arvados.git/sdk/go/arvados"
22 "git.curoverse.com/arvados.git/sdk/go/auth"
23 "git.curoverse.com/arvados.git/sdk/go/httpserver"
24 "git.curoverse.com/arvados.git/sdk/go/keepclient"
27 var wfRe = regexp.MustCompile(`^/arvados/v1/workflows/([0-9a-z]{5})-[^/]+$`)
28 var collectionRe = regexp.MustCompile(`^/arvados/v1/collections/([0-9a-z]{5})-[^/]+$`)
29 var collectionByPDHRe = regexp.MustCompile(`^/arvados/v1/collections/([0-9a-fA-F]{32}\+[0-9]+)+$`)
31 type genericFederatedRequestHandler struct {
36 type collectionFederatedRequestHandler struct {
41 func (h *Handler) remoteClusterRequest(remoteID string, w http.ResponseWriter, req *http.Request, filter ResponseFilter) {
42 remote, ok := h.Cluster.RemoteClusters[remoteID]
44 httpserver.Error(w, "no proxy available for cluster "+remoteID, http.StatusNotFound)
47 scheme := remote.Scheme
51 err := h.saltAuthToken(req, remoteID)
53 httpserver.Error(w, err.Error(), http.StatusBadRequest)
60 RawPath: req.URL.RawPath,
61 RawQuery: req.URL.RawQuery,
63 client := h.secureClient
65 client = h.insecureClient
67 h.proxy.Do(w, req, urlOut, client, filter)
70 func (h *genericFederatedRequestHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
71 m := wfRe.FindStringSubmatch(req.URL.Path)
72 if len(m) < 2 || m[1] == h.handler.Cluster.ClusterID {
73 h.next.ServeHTTP(w, req)
76 h.handler.remoteClusterRequest(m[1], w, req, nil)
79 type rewriteSignaturesClusterId string
81 func (clusterId rewriteSignaturesClusterId) rewriteSignatures(resp *http.Response, requestError error) (newResponse *http.Response, err error) {
82 if requestError != nil {
83 return resp, requestError
86 if resp.StatusCode != 200 {
90 originalBody := resp.Body
91 defer originalBody.Close()
93 var col arvados.Collection
94 err = json.NewDecoder(resp.Body).Decode(&col)
99 // rewriting signatures will make manifest text 5-10% bigger so calculate
100 // capacity accordingly
101 updatedManifest := bytes.NewBuffer(make([]byte, 0, int(float64(len(col.ManifestText))*1.1)))
103 scanner := bufio.NewScanner(strings.NewReader(col.ManifestText))
104 scanner.Buffer(make([]byte, 1048576), len(col.ManifestText))
106 line := scanner.Text()
107 tokens := strings.Split(line, " ")
109 return nil, fmt.Errorf("Invalid stream (<3 tokens): %q", line)
112 updatedManifest.WriteString(tokens[0])
113 for _, token := range tokens[1:] {
114 updatedManifest.WriteString(" ")
115 m := keepclient.SignedLocatorRe.FindStringSubmatch(token)
117 // Rewrite the block signature to be a remote signature
118 fmt.Fprintf(updatedManifest, "%s%s%s+R%s-%s%s", m[1], m[2], m[3], clusterId, m[5][2:], m[8])
120 updatedManifest.WriteString(token)
124 updatedManifest.WriteString("\n")
127 col.ManifestText = updatedManifest.String()
129 newbody, err := json.Marshal(col)
134 buf := bytes.NewBuffer(newbody)
135 resp.Body = ioutil.NopCloser(buf)
136 resp.ContentLength = int64(buf.Len())
137 resp.Header.Set("Content-Length", fmt.Sprintf("%v", buf.Len()))
142 type searchLocalClusterForPDH struct {
146 func (s *searchLocalClusterForPDH) filterLocalClusterResponse(resp *http.Response, requestError error) (newResponse *http.Response, err error) {
147 if requestError != nil {
148 return resp, requestError
151 if resp.StatusCode == 404 {
152 // Suppress returning this result, because we want to
153 // search the federation.
154 s.sentResponse = false
157 s.sentResponse = true
161 type searchRemoteClusterForPDH struct {
165 sharedContext *context.Context
171 func (s *searchRemoteClusterForPDH) filterRemoteClusterResponse(resp *http.Response, requestError error) (newResponse *http.Response, err error) {
176 // Another request already returned a response
180 if requestError != nil {
181 *s.errors = append(*s.errors, fmt.Sprintf("Request error contacting %q: %v", s.remoteID, requestError))
182 // Record the error and suppress response
186 if resp.StatusCode != 200 {
187 // Suppress returning unsuccessful result. Maybe
188 // another request will find it.
189 // TODO collect and return error responses.
190 *s.errors = append(*s.errors, fmt.Sprintf("Response from %q: %v", s.remoteID, resp.Status))
191 if resp.StatusCode != 404 {
192 // Got a non-404 error response, convert into BadGateway
193 *s.statusCode = http.StatusBadGateway
200 // This reads the response body. We don't want to hold the
201 // lock while doing this because other remote requests could
202 // also have made it to this point, and we don't want a
203 // slow response holding the lock to block a faster response
204 // that is waiting on the lock.
205 newResponse, err = rewriteSignaturesClusterId(s.remoteID).rewriteSignatures(resp, nil)
210 // Another request already returned a response
215 // Suppress returning unsuccessful result. Maybe
216 // another request will be successful.
217 *s.errors = append(*s.errors, fmt.Sprintf("Error parsing response from %q: %v", s.remoteID, err))
221 // We have a successful response. Suppress/cancel all the
222 // other requests/responses.
223 *s.sentResponse = true
226 return newResponse, nil
229 func (h *collectionFederatedRequestHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
230 m := collectionByPDHRe.FindStringSubmatch(req.URL.Path)
232 // Not a collection PDH request
233 m = collectionRe.FindStringSubmatch(req.URL.Path)
234 if len(m) == 2 && m[1] != h.handler.Cluster.ClusterID {
235 // request for remote collection by uuid
236 h.handler.remoteClusterRequest(m[1], w, req,
237 rewriteSignaturesClusterId(m[1]).rewriteSignatures)
240 // not a collection UUID request, or it is a request
241 // for a local UUID, either way, continue down the
243 h.next.ServeHTTP(w, req)
247 // Request for collection by PDH. Search the federation.
249 // First, query the local cluster.
250 urlOut, insecure, err := findRailsAPI(h.handler.Cluster, h.handler.NodeProfile)
252 httpserver.Error(w, err.Error(), http.StatusInternalServerError)
257 Scheme: urlOut.Scheme,
260 RawPath: req.URL.RawPath,
261 RawQuery: req.URL.RawQuery,
263 client := h.handler.secureClient
265 client = h.handler.insecureClient
267 sf := &searchLocalClusterForPDH{}
268 h.handler.proxy.Do(w, req, urlOut, client, sf.filterLocalClusterResponse)
273 sharedContext, cancelFunc := context.WithCancel(req.Context())
275 req = req.WithContext(sharedContext)
277 // Create a goroutine for each cluster in the
278 // RemoteClusters map. The first valid result gets
279 // returned to the client. When that happens, all
280 // other outstanding requests are cancelled or
282 sentResponse := false
284 wg := sync.WaitGroup{}
286 var errorCode int = 404
288 // use channel as a semaphore to limit it to 4
289 // parallel requests at a time
290 sem := make(chan bool, 4)
292 for remoteID := range h.handler.Cluster.RemoteClusters {
293 // blocks until it can put a value into the
294 // channel (which has a max queue capacity)
299 search := &searchRemoteClusterForPDH{remoteID, &mtx, &sentResponse,
300 &sharedContext, cancelFunc, &errors, &errorCode}
303 h.handler.remoteClusterRequest(search.remoteID, w, req, search.filterRemoteClusterResponse)
314 // No successful responses, so return the error
315 httpserver.Errors(w, errors, errorCode)
318 func (h *Handler) setupProxyRemoteCluster(next http.Handler) http.Handler {
319 mux := http.NewServeMux()
320 mux.Handle("/arvados/v1/workflows", next)
321 mux.Handle("/arvados/v1/workflows/", &genericFederatedRequestHandler{next, h})
322 mux.Handle("/arvados/v1/collections", next)
323 mux.Handle("/arvados/v1/collections/", &collectionFederatedRequestHandler{next, h})
324 mux.Handle("/", next)
326 return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
327 parts := strings.Split(req.Header.Get("Authorization"), "/")
328 alreadySalted := (len(parts) == 3 && parts[0] == "Bearer v2" && len(parts[2]) == 40)
331 strings.Index(req.Header.Get("Via"), "arvados-controller") != -1 {
332 // The token is already salted, or this is a
333 // request from another instance of
334 // arvados-controller. In either case, we
335 // don't want to proxy this query, so just
336 // continue down the instance handler stack.
337 next.ServeHTTP(w, req)
341 mux.ServeHTTP(w, req)
347 type CurrentUser struct {
348 Authorization arvados.APIClientAuthorization
352 func (h *Handler) validateAPItoken(req *http.Request, user *CurrentUser) error {
357 return db.QueryRowContext(req.Context(), `SELECT api_client_authorizations.uuid, users.uuid FROM api_client_authorizations JOIN users on api_client_authorizations.user_id=users.id WHERE api_token=$1 AND (expires_at IS NULL OR expires_at > current_timestamp) LIMIT 1`, user.Authorization.APIToken).Scan(&user.Authorization.UUID, &user.UUID)
360 // Extract the auth token supplied in req, and replace it with a
361 // salted token for the remote cluster.
362 func (h *Handler) saltAuthToken(req *http.Request, remote string) error {
363 creds := auth.NewCredentials()
364 creds.LoadTokensFromHTTPRequest(req)
365 if len(creds.Tokens) == 0 && req.Header.Get("Content-Type") == "application/x-www-form-encoded" {
366 // Override ParseForm's 10MiB limit by ensuring
367 // req.Body is a *http.maxBytesReader.
368 req.Body = http.MaxBytesReader(nil, req.Body, 1<<28) // 256MiB. TODO: use MaxRequestSize from discovery doc or config.
369 if err := creds.LoadTokensFromHTTPRequestBody(req); err != nil {
372 // Replace req.Body with a buffer that re-encodes the
373 // form without api_token, in case we end up
374 // forwarding the request.
375 if req.PostForm != nil {
376 req.PostForm.Del("api_token")
378 req.Body = ioutil.NopCloser(bytes.NewBufferString(req.PostForm.Encode()))
380 if len(creds.Tokens) == 0 {
383 token, err := auth.SaltToken(creds.Tokens[0], remote)
384 if err == auth.ErrObsoleteToken {
385 // If the token exists in our own database, salt it
386 // for the remote. Otherwise, assume it was issued by
387 // the remote, and pass it through unmodified.
388 currentUser := CurrentUser{Authorization: arvados.APIClientAuthorization{APIToken: creds.Tokens[0]}}
389 err = h.validateAPItoken(req, ¤tUser)
390 if err == sql.ErrNoRows {
391 // Not ours; pass through unmodified.
392 token = currentUser.Authorization.APIToken
393 } else if err != nil {
396 // Found; make V2 version and salt it.
397 token, err = auth.SaltToken(currentUser.Authorization.TokenV2(), remote)
402 } else if err != nil {
405 req.Header.Set("Authorization", "Bearer "+token)
407 // Remove api_token=... from the the query string, in case we
408 // end up forwarding the request.
409 if values, err := url.ParseQuery(req.URL.RawQuery); err != nil {
411 } else if _, ok := values["api_token"]; ok {
412 delete(values, "api_token")
413 req.URL.RawQuery = values.Encode()