X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Frgw%2Frgw_rest_client.cc;fp=src%2Fceph%2Fsrc%2Frgw%2Frgw_rest_client.cc;h=22bbfe80f363fed7245dcdc3b856671be04d2aee;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git

diff --git a/src/ceph/src/rgw/rgw_rest_client.cc b/src/ceph/src/rgw/rgw_rest_client.cc
new file mode 100644
index 0000000..22bbfe8
--- /dev/null
+++ b/src/ceph/src/rgw/rgw_rest_client.cc
@@ -0,0 +1,803 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "rgw_common.h"
+#include "rgw_rest_client.h"
+#include "rgw_auth_s3.h"
+#include "rgw_http_errors.h"
+#include "rgw_rados.h"
+
+#include "common/ceph_crypto_cms.h"
+#include "common/armor.h"
+#include "common/strtol.h"
+#include "include/str_list.h"
+#include "rgw_crypt_sanitize.h"
+
+#define dout_context g_ceph_context
+#define dout_subsys ceph_subsys_rgw
+
+int RGWRESTSimpleRequest::get_status()
+{
+  int retcode = get_req_retcode();
+  if (retcode < 0) {
+    return retcode;
+  }
+  return status;
+}
+
+int RGWRESTSimpleRequest::handle_header(const string& name, const string& val) 
+{
+  if (name == "CONTENT_LENGTH") {
+    string err;
+    long len = strict_strtol(val.c_str(), 10, &err);
+    if (!err.empty()) {
+      ldout(cct, 0) << "ERROR: failed converting content length (" << val << ") to int " << dendl;
+      return -EINVAL;
+    }
+
+    max_response = len;
+  }
+
+  return 0;
+}
+
+int RGWRESTSimpleRequest::receive_header(void *ptr, size_t len)
+{
+  char line[len + 1];
+
+  char *s = (char *)ptr, *end = (char *)ptr + len;
+  char *p = line;
+  ldout(cct, 10) << "receive_http_header" << dendl;
+
+  while (s != end) {
+    if (*s == '\r') {
+      s++;
+      continue;
+    }
+    if (*s == '\n') {
+      *p = '\0';
+      ldout(cct, 10) << "received header:" << line << dendl;
+      // TODO: fill whatever data required here
+      char *l = line;
+      char *tok = strsep(&l, " \t:");
+      if (tok && l) {
+        while (*l == ' ')
+          l++;
+ 
+        if (strcmp(tok, "HTTP") == 0 || strncmp(tok, "HTTP/", 5) == 0) {
+          http_status = atoi(l);
+          if (http_status == 100) /* 100-continue response */
+            continue;
+          status = rgw_http_error_to_errno(http_status);
+        } else {
+          /* convert header field name to upper case  */
+          char *src = tok;
+          char buf[len + 1];
+          size_t i;
+          for (i = 0; i < len && *src; ++i, ++src) {
+            switch (*src) {
+              case '-':
+                buf[i] = '_';
+                break;
+              default:
+                buf[i] = toupper(*src);
+            }
+          }
+          buf[i] = '\0';
+          out_headers[buf] = l;
+          int r = handle_header(buf, l);
+          if (r < 0)
+            return r;
+        }
+      }
+    }
+    if (s != end)
+      *p++ = *s++;
+  }
+  return 0;
+}
+
+static void get_new_date_str(string& date_str)
+{
+  date_str = rgw_to_asctime(ceph_clock_now());
+}
+
+int RGWRESTSimpleRequest::execute(RGWAccessKey& key, const char *method, const char *resource)
+{
+  string new_url = url;
+  string new_resource = resource;
+
+  if (new_url[new_url.size() - 1] == '/' && resource[0] == '/') {
+    new_url = new_url.substr(0, new_url.size() - 1);
+  } else if (resource[0] != '/') {
+    new_resource = "/";
+    new_resource.append(resource);
+  }
+  new_url.append(new_resource);
+
+  string date_str;
+  get_new_date_str(date_str);
+  headers.push_back(pair<string, string>("HTTP_DATE", date_str));
+
+  string canonical_header;
+  map<string, string> meta_map;
+  map<string, string> sub_resources;
+  rgw_create_s3_canonical_header(method, NULL, NULL, date_str.c_str(),
+                            meta_map, new_url.c_str(), sub_resources,
+                            canonical_header);
+
+  string digest;
+  try {
+    digest = rgw::auth::s3::get_v2_signature(cct, key.key, canonical_header);
+  } catch (int ret) {
+    return ret;
+  }
+
+  string auth_hdr = "AWS " + key.id + ":" + digest;
+
+  ldout(cct, 15) << "generated auth header: " << auth_hdr << dendl;
+
+  headers.push_back(pair<string, string>("AUTHORIZATION", auth_hdr));
+  int r = process(method, new_url.c_str());
+  if (r < 0)
+    return r;
+
+  return status;
+}
+
+int RGWRESTSimpleRequest::send_data(void *ptr, size_t len)
+{
+  if (!send_iter)
+    return 0;
+
+  if (len > send_iter->get_remaining())
+    len = send_iter->get_remaining();
+
+  send_iter->copy(len, (char *)ptr);
+
+  return len;
+}
+
+int RGWRESTSimpleRequest::receive_data(void *ptr, size_t len)
+{
+  size_t cp_len, left_len;
+
+  left_len = max_response > response.length() ? (max_response - response.length()) : 0;
+  if (left_len == 0)
+    return 0; /* don't read extra data */
+
+  cp_len = (len > left_len) ? left_len : len;
+  bufferptr p((char *)ptr, cp_len);
+
+  response.append(p);
+
+  return 0;
+
+}
+
+void RGWRESTSimpleRequest::append_param(string& dest, const string& name, const string& val)
+{
+  if (dest.empty()) {
+    dest.append("?");
+  } else {
+    dest.append("&");
+  }
+  string url_name;
+  url_encode(name, url_name);
+  dest.append(url_name);
+
+  if (!val.empty()) {
+    string url_val;
+    url_encode(val, url_val);
+    dest.append("=");
+    dest.append(url_val);
+  }
+}
+
+void RGWRESTSimpleRequest::get_params_str(map<string, string>& extra_args, string& dest)
+{
+  map<string, string>::iterator miter;
+  for (miter = extra_args.begin(); miter != extra_args.end(); ++miter) {
+    append_param(dest, miter->first, miter->second);
+  }
+  param_vec_t::iterator iter;
+  for (iter = params.begin(); iter != params.end(); ++iter) {
+    append_param(dest, iter->first, iter->second);
+  }
+}
+
+int RGWRESTSimpleRequest::sign_request(RGWAccessKey& key, RGWEnv& env, req_info& info)
+{
+  /* don't sign if no key is provided */
+  if (key.key.empty()) {
+    return 0;
+  }
+
+  if (cct->_conf->subsys.should_gather(ceph_subsys_rgw, 20)) {
+    for (const auto& i: env.get_map()) {
+      ldout(cct, 20) << "> " << i.first << " -> " << rgw::crypt_sanitize::x_meta_map{i.first, i.second} << dendl;
+    }
+  }
+
+  string canonical_header;
+  if (!rgw_create_s3_canonical_header(info, NULL, canonical_header, false)) {
+    ldout(cct, 0) << "failed to create canonical s3 header" << dendl;
+    return -EINVAL;
+  }
+
+  ldout(cct, 10) << "generated canonical header: " << canonical_header << dendl;
+
+  string digest;
+  try {
+    digest = rgw::auth::s3::get_v2_signature(cct, key.key, canonical_header);
+  } catch (int ret) {
+    return ret;
+  }
+
+  string auth_hdr = "AWS " + key.id + ":" + digest;
+  ldout(cct, 15) << "generated auth header: " << auth_hdr << dendl;
+  
+  env.set("AUTHORIZATION", auth_hdr);
+
+  return 0;
+}
+
+int RGWRESTSimpleRequest::forward_request(RGWAccessKey& key, req_info& info, size_t max_response, bufferlist *inbl, bufferlist *outbl)
+{
+
+  string date_str;
+  get_new_date_str(date_str);
+
+  RGWEnv new_env;
+  req_info new_info(cct, &new_env);
+  new_info.rebuild_from(info);
+
+  new_env.set("HTTP_DATE", date_str.c_str());
+
+  int ret = sign_request(key, new_env, new_info);
+  if (ret < 0) {
+    ldout(cct, 0) << "ERROR: failed to sign request" << dendl;
+    return ret;
+  }
+
+  for (const auto& kv: new_env.get_map()) {
+    headers.emplace_back(kv);
+  }
+
+  map<string, string>& meta_map = new_info.x_meta_map;
+  for (const auto& kv: meta_map) {
+    headers.emplace_back(kv);
+  }
+
+  string params_str;
+  get_params_str(info.args.get_params(), params_str);
+
+  string new_url = url;
+  string& resource = new_info.request_uri;
+  string new_resource = resource;
+  if (new_url[new_url.size() - 1] == '/' && resource[0] == '/') {
+    new_url = new_url.substr(0, new_url.size() - 1);
+  } else if (resource[0] != '/') {
+    new_resource = "/";
+    new_resource.append(resource);
+  }
+  new_url.append(new_resource + params_str);
+
+  bufferlist::iterator bliter;
+
+  if (inbl) {
+    bliter = inbl->begin();
+    send_iter = &bliter;
+
+    set_send_length(inbl->length());
+  }
+
+  int r = process(new_info.method, new_url.c_str());
+  if (r < 0){
+    if (r == -EINVAL){
+      // curl_easy has errored, generally means the service is not available
+      r = -ERR_SERVICE_UNAVAILABLE;
+    }
+    return r;
+  }
+
+  response.append((char)0); /* NULL terminate response */
+
+  if (outbl) {
+    outbl->claim(response);
+  }
+
+  return status;
+}
+
+class RGWRESTStreamOutCB : public RGWGetDataCB {
+  RGWRESTStreamWriteRequest *req;
+public:
+  explicit RGWRESTStreamOutCB(RGWRESTStreamWriteRequest *_req) : req(_req) {}
+  int handle_data(bufferlist& bl, off_t bl_ofs, off_t bl_len) override; /* callback for object iteration when sending data */
+};
+
+int RGWRESTStreamOutCB::handle_data(bufferlist& bl, off_t bl_ofs, off_t bl_len)
+{
+  dout(20) << "RGWRESTStreamOutCB::handle_data bl.length()=" << bl.length() << " bl_ofs=" << bl_ofs << " bl_len=" << bl_len << dendl;
+  if (!bl_ofs && bl_len == bl.length()) {
+    return req->add_output_data(bl);
+  }
+
+  bufferptr bp(bl.c_str() + bl_ofs, bl_len);
+  bufferlist new_bl;
+  new_bl.push_back(bp);
+
+  return req->add_output_data(new_bl);
+}
+
+RGWRESTStreamWriteRequest::~RGWRESTStreamWriteRequest()
+{
+  delete cb;
+}
+
+int RGWRESTStreamWriteRequest::add_output_data(bufferlist& bl)
+{
+  lock.Lock();
+  if (status < 0) {
+    int ret = status;
+    lock.Unlock();
+    return ret;
+  }
+  pending_send.push_back(bl);
+  lock.Unlock();
+
+  bool done;
+  return http_manager.process_requests(false, &done);
+}
+
+static void grants_by_type_add_one_grant(map<int, string>& grants_by_type, int perm, ACLGrant& grant)
+{
+  string& s = grants_by_type[perm];
+
+  if (!s.empty())
+    s.append(", ");
+
+  string id_type_str;
+  ACLGranteeType& type = grant.get_type();
+  switch (type.get_type()) {
+    case ACL_TYPE_GROUP:
+      id_type_str = "uri";
+      break;
+    case ACL_TYPE_EMAIL_USER:
+      id_type_str = "emailAddress";
+      break;
+    default:
+      id_type_str = "id";
+  }
+  rgw_user id;
+  grant.get_id(id);
+  s.append(id_type_str + "=\"" + id.to_str() + "\"");
+}
+
+struct grant_type_to_header {
+  int type;
+  const char *header;
+};
+
+struct grant_type_to_header grants_headers_def[] = {
+  { RGW_PERM_FULL_CONTROL, "x-amz-grant-full-control"},
+  { RGW_PERM_READ,         "x-amz-grant-read"},
+  { RGW_PERM_WRITE,        "x-amz-grant-write"},
+  { RGW_PERM_READ_ACP,     "x-amz-grant-read-acp"},
+  { RGW_PERM_WRITE_ACP,    "x-amz-grant-write-acp"},
+  { 0, NULL}
+};
+
+static bool grants_by_type_check_perm(map<int, string>& grants_by_type, int perm, ACLGrant& grant, int check_perm)
+{
+  if ((perm & check_perm) == check_perm) {
+    grants_by_type_add_one_grant(grants_by_type, check_perm, grant);
+    return true;
+  }
+  return false;
+}
+
+static void grants_by_type_add_perm(map<int, string>& grants_by_type, int perm, ACLGrant& grant)
+{
+  struct grant_type_to_header *t;
+
+  for (t = grants_headers_def; t->header; t++) {
+    if (grants_by_type_check_perm(grants_by_type, perm, grant, t->type))
+      return;
+  }
+}
+
+static void add_grants_headers(map<int, string>& grants, RGWEnv& env, map<string, string>& meta_map)
+{
+  struct grant_type_to_header *t;
+
+  for (t = grants_headers_def; t->header; t++) {
+    map<int, string>::iterator iter = grants.find(t->type);
+    if (iter != grants.end()) {
+      env.set(t->header,iter->second);
+      meta_map[t->header] = iter->second;
+    }
+  }
+}
+
+int RGWRESTStreamWriteRequest::put_obj_init(RGWAccessKey& key, rgw_obj& obj, uint64_t obj_size, map<string, bufferlist>& attrs)
+{
+  string resource = obj.bucket.name + "/" + obj.get_oid();
+  string new_url = url;
+  if (new_url[new_url.size() - 1] != '/')
+    new_url.append("/");
+
+  string date_str;
+  get_new_date_str(date_str);
+
+  RGWEnv new_env;
+  req_info new_info(cct, &new_env);
+  
+  string params_str;
+  map<string, string>& args = new_info.args.get_params();
+  get_params_str(args, params_str);
+
+  new_url.append(resource + params_str);
+
+  new_env.set("HTTP_DATE", date_str.c_str());
+
+  new_info.method = "PUT";
+
+  new_info.script_uri = "/";
+  new_info.script_uri.append(resource);
+  new_info.request_uri = new_info.script_uri;
+
+  /* merge send headers */
+  for (auto& attr: attrs) {
+    bufferlist& bl = attr.second;
+    const string& name = attr.first;
+    string val = bl.c_str();
+    if (name.compare(0, sizeof(RGW_ATTR_META_PREFIX) - 1, RGW_ATTR_META_PREFIX) == 0) {
+      string header_name = RGW_AMZ_META_PREFIX;
+      header_name.append(name.substr(sizeof(RGW_ATTR_META_PREFIX) - 1));
+      new_env.set(header_name, val);
+      new_info.x_meta_map[header_name] = val;
+    }
+  }
+  RGWAccessControlPolicy policy;
+  int ret = rgw_policy_from_attrset(cct, attrs, &policy);
+  if (ret < 0) {
+    ldout(cct, 0) << "ERROR: couldn't get policy ret=" << ret << dendl;
+    return ret;
+  }
+
+  /* update acl headers */
+  RGWAccessControlList& acl = policy.get_acl();
+  multimap<string, ACLGrant>& grant_map = acl.get_grant_map();
+  multimap<string, ACLGrant>::iterator giter;
+  map<int, string> grants_by_type;
+  for (giter = grant_map.begin(); giter != grant_map.end(); ++giter) {
+    ACLGrant& grant = giter->second;
+    ACLPermission& perm = grant.get_permission();
+    grants_by_type_add_perm(grants_by_type, perm.get_permissions(), grant);
+  }
+  add_grants_headers(grants_by_type, new_env, new_info.x_meta_map);
+  ret = sign_request(key, new_env, new_info);
+  if (ret < 0) {
+    ldout(cct, 0) << "ERROR: failed to sign request" << dendl;
+    return ret;
+  }
+
+  for (const auto& kv: new_env.get_map()) {
+    headers.emplace_back(kv);
+  }
+
+  cb = new RGWRESTStreamOutCB(this);
+
+  set_send_length(obj_size);
+
+  int r = http_manager.add_request(this, new_info.method, new_url.c_str());
+  if (r < 0)
+    return r;
+
+  return 0;
+}
+
+int RGWRESTStreamWriteRequest::send_data(void *ptr, size_t len)
+{
+  uint64_t sent = 0;
+
+  dout(20) << "RGWRESTStreamWriteRequest::send_data()" << dendl;
+  lock.Lock();
+  if (pending_send.empty() || status < 0) {
+    lock.Unlock();
+    return status;
+  }
+
+  list<bufferlist>::iterator iter = pending_send.begin();
+  while (iter != pending_send.end() && len > 0) {
+    bufferlist& bl = *iter;
+    
+    list<bufferlist>::iterator next_iter = iter;
+    ++next_iter;
+    lock.Unlock();
+
+    uint64_t send_len = min(len, (size_t)bl.length());
+
+    memcpy(ptr, bl.c_str(), send_len);
+
+    ptr = (char *)ptr + send_len;
+    len -= send_len;
+    sent += send_len;
+
+    lock.Lock();
+
+    bufferlist new_bl;
+    if (bl.length() > send_len) {
+      bufferptr bp(bl.c_str() + send_len, bl.length() - send_len);
+      new_bl.append(bp);
+    }
+    pending_send.pop_front(); /* need to do this after we copy data from bl */
+    if (new_bl.length()) {
+      pending_send.push_front(new_bl);
+    }
+    iter = next_iter;
+  }
+  lock.Unlock();
+
+  return sent;
+}
+
+
+void set_str_from_headers(map<string, string>& out_headers, const string& header_name, string& str)
+{
+  map<string, string>::iterator iter = out_headers.find(header_name);
+  if (iter != out_headers.end()) {
+    str = iter->second;
+  } else {
+    str.clear();
+  }
+}
+
+static int parse_rgwx_mtime(CephContext *cct, const string& s, ceph::real_time *rt)
+{
+  string err;
+  vector<string> vec;
+
+  get_str_vec(s, ".", vec);
+
+  if (vec.empty()) {
+    return -EINVAL;
+  }
+
+  long secs = strict_strtol(vec[0].c_str(), 10, &err);
+  long nsecs = 0;
+  if (!err.empty()) {
+    ldout(cct, 0) << "ERROR: failed converting mtime (" << s << ") to real_time " << dendl;
+    return -EINVAL;
+  }
+
+  if (vec.size() > 1) {
+    nsecs = strict_strtol(vec[1].c_str(), 10, &err);
+    if (!err.empty()) {
+      ldout(cct, 0) << "ERROR: failed converting mtime (" << s << ") to real_time " << dendl;
+      return -EINVAL;
+    }
+  }
+
+  *rt = utime_t(secs, nsecs).to_real_time();
+
+  return 0;
+}
+
+int RGWRESTStreamWriteRequest::complete(string& etag, real_time *mtime)
+{
+  int ret = http_manager.complete_requests();
+  if (ret < 0)
+    return ret;
+
+  set_str_from_headers(out_headers, "ETAG", etag);
+
+  if (mtime) {
+    string mtime_str;
+    set_str_from_headers(out_headers, "RGWX_MTIME", mtime_str);
+
+    ret = parse_rgwx_mtime(cct, mtime_str, mtime);
+    if (ret < 0) {
+      return ret;
+    }
+  }
+  return status;
+}
+
+int RGWRESTStreamRWRequest::send_request(RGWAccessKey& key, map<string, string>& extra_headers, rgw_obj& obj, RGWHTTPManager *mgr)
+{
+  string urlsafe_bucket, urlsafe_object;
+  url_encode(obj.bucket.get_key(':', 0), urlsafe_bucket);
+  url_encode(obj.key.name, urlsafe_object);
+  string resource = urlsafe_bucket + "/" + urlsafe_object;
+
+  return send_request(&key, extra_headers, resource, nullptr, mgr);
+}
+
+int RGWRESTStreamRWRequest::send_request(RGWAccessKey *key, map<string, string>& extra_headers, const string& resource,
+                                         bufferlist *send_data, RGWHTTPManager *mgr)
+{
+  string new_url = url;
+  if (new_url[new_url.size() - 1] != '/')
+    new_url.append("/");
+
+  string date_str;
+  get_new_date_str(date_str);
+
+  RGWEnv new_env;
+  req_info new_info(cct, &new_env);
+  
+  string params_str;
+  map<string, string>& args = new_info.args.get_params();
+  get_params_str(args, params_str);
+
+  /* merge params with extra args so that we can sign correctly */
+  for (param_vec_t::iterator iter = params.begin(); iter != params.end(); ++iter) {
+    new_info.args.append(iter->first, iter->second);
+  }
+
+  string new_resource;
+  if (resource[0] == '/') {
+    new_resource = resource.substr(1);
+  } else {
+    new_resource = resource;
+  }
+
+  new_url.append(new_resource + params_str);
+
+  new_env.set("HTTP_DATE", date_str.c_str());
+
+  for (map<string, string>::iterator iter = extra_headers.begin();
+       iter != extra_headers.end(); ++iter) {
+    new_env.set(iter->first.c_str(), iter->second.c_str());
+  }
+
+  new_info.method = method;
+
+  new_info.script_uri = "/";
+  new_info.script_uri.append(new_resource);
+  new_info.request_uri = new_info.script_uri;
+
+  new_info.init_meta_info(NULL);
+
+  if (key) {
+    int ret = sign_request(*key, new_env, new_info);
+    if (ret < 0) {
+      ldout(cct, 0) << "ERROR: failed to sign request" << dendl;
+      return ret;
+    }
+  }
+
+  for (const auto& kv: new_env.get_map()) {
+    headers.emplace_back(kv);
+  }
+
+  bool send_data_hint = false;
+  if (send_data) {
+    outbl.claim(*send_data);
+    send_data_hint = true;
+  }
+
+  RGWHTTPManager *pmanager = &http_manager;
+  if (mgr) {
+    pmanager = mgr;
+  }
+
+  int r = pmanager->add_request(this, new_info.method, new_url.c_str(), send_data_hint);
+  if (r < 0)
+    return r;
+
+  if (!mgr) {
+    r = pmanager->complete_requests();
+    if (r < 0)
+      return r;
+  }
+
+  return 0;
+}
+
+int RGWRESTStreamRWRequest::complete_request(string& etag, real_time *mtime, uint64_t *psize, map<string, string>& attrs)
+{
+  set_str_from_headers(out_headers, "ETAG", etag);
+  if (status >= 0) {
+    if (mtime) {
+      string mtime_str;
+      set_str_from_headers(out_headers, "RGWX_MTIME", mtime_str);
+      if (!mtime_str.empty()) {
+        int ret = parse_rgwx_mtime(cct, mtime_str, mtime);
+        if (ret < 0) {
+          return ret;
+        }
+      } else {
+        *mtime = real_time();
+      }
+    }
+    if (psize) {
+      string size_str;
+      set_str_from_headers(out_headers, "RGWX_OBJECT_SIZE", size_str);
+      string err;
+      *psize = strict_strtoll(size_str.c_str(), 10, &err);
+      if (!err.empty()) {
+        ldout(cct, 0) << "ERROR: failed parsing embedded metadata object size (" << size_str << ") to int " << dendl;
+        return -EIO;
+      }
+    }
+  }
+
+  map<string, string>::iterator iter;
+  for (iter = out_headers.begin(); iter != out_headers.end(); ++iter) {
+    const string& attr_name = iter->first;
+    if (attr_name.compare(0, sizeof(RGW_HTTP_RGWX_ATTR_PREFIX) - 1, RGW_HTTP_RGWX_ATTR_PREFIX) == 0) {
+      string name = attr_name.substr(sizeof(RGW_HTTP_RGWX_ATTR_PREFIX) - 1);
+      const char *src = name.c_str();
+      char buf[name.size() + 1];
+      char *dest = buf;
+      for (; *src; ++src, ++dest) {
+        switch(*src) {
+          case '_':
+            *dest = '-';
+            break;
+          default:
+            *dest = tolower(*src);
+        }
+      }
+      *dest = '\0';
+      attrs[buf] = iter->second;
+    }
+  }
+  return status;
+}
+
+int RGWRESTStreamRWRequest::handle_header(const string& name, const string& val)
+{
+  if (name == "RGWX_EMBEDDED_METADATA_LEN") {
+    string err;
+    long len = strict_strtol(val.c_str(), 10, &err);
+    if (!err.empty()) {
+      ldout(cct, 0) << "ERROR: failed converting embedded metadata len (" << val << ") to int " << dendl;
+      return -EINVAL;
+    }
+
+    cb->set_extra_data_len(len);
+  }
+  return 0;
+}
+
+int RGWRESTStreamRWRequest::receive_data(void *ptr, size_t len)
+{
+  bufferptr bp((const char *)ptr, len);
+  bufferlist bl;
+  bl.append(bp);
+  int ret = cb->handle_data(bl, ofs, len);
+  if (ret < 0)
+    return ret;
+  ofs += len;
+  return len;
+}
+
+int RGWRESTStreamRWRequest::send_data(void *ptr, size_t len)
+{
+  if (outbl.length() == 0) {
+    return 0;
+  }
+
+  uint64_t send_size = min(len, (size_t)(outbl.length() - write_ofs));
+  if (send_size > 0) {
+    memcpy(ptr, outbl.c_str() + write_ofs, send_size);
+    write_ofs += send_size;
+  }
+  return send_size;
+}
+
+class StreamIntoBufferlist : public RGWGetDataCB {
+  bufferlist& bl;
+public:
+  StreamIntoBufferlist(bufferlist& _bl) : bl(_bl) {}
+  int handle_data(bufferlist& inbl, off_t bl_ofs, off_t bl_len) override {
+    bl.claim_append(inbl);
+    return bl_len;
+  }
+};
+