// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab

#ifndef CEPH_RGW_REST_S3_H

#define CEPH_RGW_REST_S3_H
#define TIME_BUF_SIZE 128

#include <mutex>

#include <boost/utility/string_view.hpp>
#include <boost/container/static_vector.hpp>

#include "common/backport14.h"
#include "common/sstring.hh"
#include "rgw_op.h"
#include "rgw_rest.h"
#include "rgw_http_errors.h"
#include "rgw_acl_s3.h"
#include "rgw_policy_s3.h"
#include "rgw_lc_s3.h"
#include "rgw_keystone.h"
#include "rgw_rest_conn.h"
#include "rgw_ldap.h"
#include "rgw_rest.h"

#include "rgw_token.h"
#include "include/assert.h"

#include "rgw_auth.h"
#include "rgw_auth_filters.h"

#define RGW_AUTH_GRACE_MINS 15

struct rgw_http_error {
  int http_ret;
  const char *s3_code;
};

void rgw_get_errno_s3(struct rgw_http_error *e, int err_no);

class RGWGetObj_ObjStore_S3 : public RGWGetObj_ObjStore
{
protected:
  // Serving a custom error page from an object is really a 200 response with
  // just the status line altered.
  int custom_http_ret = 0;
  std::map<std::string, std::string> crypt_http_responses;
public:
  RGWGetObj_ObjStore_S3() {}
  ~RGWGetObj_ObjStore_S3() override {}

  int get_params() override;
  int send_response_data_error() override;
  int send_response_data(bufferlist& bl, off_t ofs, off_t len) override;
  void set_custom_http_response(int http_ret) { custom_http_ret = http_ret; }
  int get_decrypt_filter(std::unique_ptr<RGWGetDataCB>* filter,
                         RGWGetDataCB* cb,
                         bufferlist* manifest_bl) override;
};

class RGWGetObjTags_ObjStore_S3 : public RGWGetObjTags_ObjStore
{
  bufferlist tags_bl;
public:
  RGWGetObjTags_ObjStore_S3() {}
  ~RGWGetObjTags_ObjStore_S3() {}

  void send_response_data(bufferlist &bl) override;
};

class RGWPutObjTags_ObjStore_S3 : public RGWPutObjTags_ObjStore
{
public:
  RGWPutObjTags_ObjStore_S3() {}
  ~RGWPutObjTags_ObjStore_S3() {}

  int get_params() override;
  void send_response() override;
};

class RGWDeleteObjTags_ObjStore_S3 : public RGWDeleteObjTags
{
public:
  ~RGWDeleteObjTags_ObjStore_S3() override {}
  void send_response() override;
};

class RGWListBuckets_ObjStore_S3 : public RGWListBuckets_ObjStore {
public:
  RGWListBuckets_ObjStore_S3() {}
  ~RGWListBuckets_ObjStore_S3() override {}

  int get_params() override {
    limit = -1; /* no limit */
    return 0;
  }
  void send_response_begin(bool has_buckets) override;
  void send_response_data(RGWUserBuckets& buckets) override;
  void send_response_end() override;
};

class RGWGetUsage_ObjStore_S3 : public RGWGetUsage_ObjStore {
public:
  RGWGetUsage_ObjStore_S3() {}
  ~RGWGetUsage_ObjStore_S3() override {}

  int get_params() override ;
  void send_response() override;
};

class RGWListBucket_ObjStore_S3 : public RGWListBucket_ObjStore {
  bool objs_container;
public:
  RGWListBucket_ObjStore_S3() : objs_container(false) {
    default_max = 1000;
  }
  ~RGWListBucket_ObjStore_S3() override {}

  int get_params() override;
  void send_response() override;
  void send_versioned_response();
};

class RGWGetBucketLogging_ObjStore_S3 : public RGWGetBucketLogging {
public:
  RGWGetBucketLogging_ObjStore_S3() {}
  ~RGWGetBucketLogging_ObjStore_S3() override {}

  void send_response() override;
};

class RGWGetBucketLocation_ObjStore_S3 : public RGWGetBucketLocation {
public:
  RGWGetBucketLocation_ObjStore_S3() {}
  ~RGWGetBucketLocation_ObjStore_S3() override {}

  void send_response() override;
};

class RGWGetBucketVersioning_ObjStore_S3 : public RGWGetBucketVersioning {
public:
  RGWGetBucketVersioning_ObjStore_S3() {}
  ~RGWGetBucketVersioning_ObjStore_S3() override {}

  void send_response() override;
};

class RGWSetBucketVersioning_ObjStore_S3 : public RGWSetBucketVersioning {
public:
  RGWSetBucketVersioning_ObjStore_S3() {}
  ~RGWSetBucketVersioning_ObjStore_S3() override {}

  int get_params() override;
  void send_response() override;
};

class RGWGetBucketWebsite_ObjStore_S3 : public RGWGetBucketWebsite {
public:
  RGWGetBucketWebsite_ObjStore_S3() {}
  ~RGWGetBucketWebsite_ObjStore_S3() override {}

  void send_response() override;
};

class RGWSetBucketWebsite_ObjStore_S3 : public RGWSetBucketWebsite {
public:
  RGWSetBucketWebsite_ObjStore_S3() {}
  ~RGWSetBucketWebsite_ObjStore_S3() override {}

  int get_params() override;
  void send_response() override;
};

class RGWDeleteBucketWebsite_ObjStore_S3 : public RGWDeleteBucketWebsite {
public:
  RGWDeleteBucketWebsite_ObjStore_S3() {}
  ~RGWDeleteBucketWebsite_ObjStore_S3() override {}

  void send_response() override;
};

class RGWStatBucket_ObjStore_S3 : public RGWStatBucket_ObjStore {
public:
  RGWStatBucket_ObjStore_S3() {}
  ~RGWStatBucket_ObjStore_S3() override {}

  void send_response() override;
};

class RGWCreateBucket_ObjStore_S3 : public RGWCreateBucket_ObjStore {
public:
  RGWCreateBucket_ObjStore_S3() {}
  ~RGWCreateBucket_ObjStore_S3() override {}

  int get_params() override;
  void send_response() override;
};

class RGWDeleteBucket_ObjStore_S3 : public RGWDeleteBucket_ObjStore {
public:
  RGWDeleteBucket_ObjStore_S3() {}
  ~RGWDeleteBucket_ObjStore_S3() override {}

  void send_response() override;
};

class RGWPutObj_ObjStore_S3 : public RGWPutObj_ObjStore {
private:
  std::map<std::string, std::string> crypt_http_responses;

public:
  RGWPutObj_ObjStore_S3() {}
  ~RGWPutObj_ObjStore_S3() override {}

  int get_params() override;
  int get_data(bufferlist& bl) override;
  void send_response() override;

  int get_encrypt_filter(std::unique_ptr<RGWPutObjDataProcessor>* filter,
                         RGWPutObjDataProcessor* cb) override;
  int get_decrypt_filter(std::unique_ptr<RGWGetDataCB>* filter,
                         RGWGetDataCB* cb,
                         map<string, bufferlist>& attrs,
                         bufferlist* manifest_bl) override;
};

class RGWPostObj_ObjStore_S3 : public RGWPostObj_ObjStore {
  parts_collection_t parts;
  std::string filename;
  std::string content_type;
  RGWPolicyEnv env;
  RGWPolicy post_policy;
  map<string, string> crypt_http_responses;

  const rgw::auth::StrategyRegistry* auth_registry_ptr = nullptr;

  int get_policy();
  int get_tags();
  void rebuild_key(string& key);

  std::string get_current_filename() const override;
  std::string get_current_content_type() const override;

public:
  RGWPostObj_ObjStore_S3() {}
  ~RGWPostObj_ObjStore_S3() override {}

  int verify_requester(const rgw::auth::StrategyRegistry& auth_registry) {
    auth_registry_ptr = &auth_registry;
    return RGWPostObj_ObjStore::verify_requester(auth_registry);
  }

  int get_params() override;
  int complete_get_params();

  void send_response() override;
  int get_data(ceph::bufferlist& bl, bool& again) override;
  int get_encrypt_filter(std::unique_ptr<RGWPutObjDataProcessor>* filter,
                         RGWPutObjDataProcessor* cb) override;
};

class RGWDeleteObj_ObjStore_S3 : public RGWDeleteObj_ObjStore {
public:
  RGWDeleteObj_ObjStore_S3() {}
  ~RGWDeleteObj_ObjStore_S3() override {}

  int get_params() override;
  void send_response() override;
};

class RGWCopyObj_ObjStore_S3 : public RGWCopyObj_ObjStore {
  bool sent_header;
public:
  RGWCopyObj_ObjStore_S3() : sent_header(false) {}
  ~RGWCopyObj_ObjStore_S3() override {}

  int init_dest_policy() override;
  int get_params() override;
  void send_partial_response(off_t ofs) override;
  void send_response() override;
};

class RGWGetACLs_ObjStore_S3 : public RGWGetACLs_ObjStore {
public:
  RGWGetACLs_ObjStore_S3() {}
  ~RGWGetACLs_ObjStore_S3() override {}

  void send_response() override;
};

class RGWPutACLs_ObjStore_S3 : public RGWPutACLs_ObjStore {
public:
  RGWPutACLs_ObjStore_S3() {}
  ~RGWPutACLs_ObjStore_S3() override {}

  int get_policy_from_state(RGWRados *store, struct req_state *s, stringstream& ss) override;
  void send_response() override;
  int get_params() override;
};

class RGWGetLC_ObjStore_S3 : public RGWGetLC_ObjStore {
protected:
  RGWLifecycleConfiguration_S3  config;
public:
  RGWGetLC_ObjStore_S3() {}
  ~RGWGetLC_ObjStore_S3() override {}
  void execute() override;

 void send_response() override;
};

class RGWPutLC_ObjStore_S3 : public RGWPutLC_ObjStore {
public:
  RGWPutLC_ObjStore_S3() {}
  ~RGWPutLC_ObjStore_S3() override {}
  
 void send_response() override;
};

class RGWDeleteLC_ObjStore_S3 : public RGWDeleteLC_ObjStore {
public:
  RGWDeleteLC_ObjStore_S3() {}
  ~RGWDeleteLC_ObjStore_S3() override {}
  
 void send_response() override;
};

class RGWGetCORS_ObjStore_S3 : public RGWGetCORS_ObjStore {
public:
  RGWGetCORS_ObjStore_S3() {}
  ~RGWGetCORS_ObjStore_S3() override {}

  void send_response() override;
};

class RGWPutCORS_ObjStore_S3 : public RGWPutCORS_ObjStore {
public:
  RGWPutCORS_ObjStore_S3() {}
  ~RGWPutCORS_ObjStore_S3() override {}

  int get_params() override;
  void send_response() override;
};

class RGWDeleteCORS_ObjStore_S3 : public RGWDeleteCORS_ObjStore {
public:
  RGWDeleteCORS_ObjStore_S3() {}
  ~RGWDeleteCORS_ObjStore_S3() override {}

  void send_response() override;
};

class RGWOptionsCORS_ObjStore_S3 : public RGWOptionsCORS_ObjStore {
public:
  RGWOptionsCORS_ObjStore_S3() {}
  ~RGWOptionsCORS_ObjStore_S3() override {}

  void send_response() override;
};

class RGWGetRequestPayment_ObjStore_S3 : public RGWGetRequestPayment {
public:
  RGWGetRequestPayment_ObjStore_S3() {}
  ~RGWGetRequestPayment_ObjStore_S3() override {}

  void send_response() override;
};

class RGWSetRequestPayment_ObjStore_S3 : public RGWSetRequestPayment {
public:
  RGWSetRequestPayment_ObjStore_S3() {}
  ~RGWSetRequestPayment_ObjStore_S3() override {}

  int get_params() override;
  void send_response() override;
};

class RGWInitMultipart_ObjStore_S3 : public RGWInitMultipart_ObjStore {
private:
  std::map<std::string, std::string> crypt_http_responses;
public:
  RGWInitMultipart_ObjStore_S3() {}
  ~RGWInitMultipart_ObjStore_S3() override {}

  int get_params() override;
  void send_response() override;
  int prepare_encryption(map<string, bufferlist>& attrs) override;
};

class RGWCompleteMultipart_ObjStore_S3 : public RGWCompleteMultipart_ObjStore {
public:
  RGWCompleteMultipart_ObjStore_S3() {}
  ~RGWCompleteMultipart_ObjStore_S3() override {}

  int get_params() override;
  void send_response() override;
};

class RGWAbortMultipart_ObjStore_S3 : public RGWAbortMultipart_ObjStore {
public:
  RGWAbortMultipart_ObjStore_S3() {}
  ~RGWAbortMultipart_ObjStore_S3() override {}

  void send_response() override;
};

class RGWListMultipart_ObjStore_S3 : public RGWListMultipart_ObjStore {
public:
  RGWListMultipart_ObjStore_S3() {}
  ~RGWListMultipart_ObjStore_S3() override {}

  void send_response() override;
};

class RGWListBucketMultiparts_ObjStore_S3 : public RGWListBucketMultiparts_ObjStore {
public:
  RGWListBucketMultiparts_ObjStore_S3() {
    default_max = 1000;
  }
  ~RGWListBucketMultiparts_ObjStore_S3() override {}

  void send_response() override;
};

class RGWDeleteMultiObj_ObjStore_S3 : public RGWDeleteMultiObj_ObjStore {
public:
  RGWDeleteMultiObj_ObjStore_S3() {}
  ~RGWDeleteMultiObj_ObjStore_S3() override {}

  int get_params() override;
  void send_status() override;
  void begin_response() override;
  void send_partial_response(rgw_obj_key& key, bool delete_marker,
                             const string& marker_version_id, int ret) override;
  void end_response() override;
};

class RGWGetObjLayout_ObjStore_S3 : public RGWGetObjLayout {
public:
  RGWGetObjLayout_ObjStore_S3() {}
  ~RGWGetObjLayout_ObjStore_S3() {}

  void send_response();
};

class RGWConfigBucketMetaSearch_ObjStore_S3 : public RGWConfigBucketMetaSearch {
public:
  RGWConfigBucketMetaSearch_ObjStore_S3() {}
  ~RGWConfigBucketMetaSearch_ObjStore_S3() {}

  int get_params() override;
  void send_response() override;
};

class RGWGetBucketMetaSearch_ObjStore_S3 : public RGWGetBucketMetaSearch {
public:
  RGWGetBucketMetaSearch_ObjStore_S3() {}
  ~RGWGetBucketMetaSearch_ObjStore_S3() {}

  void send_response() override;
};

class RGWDelBucketMetaSearch_ObjStore_S3 : public RGWDelBucketMetaSearch {
public:
  RGWDelBucketMetaSearch_ObjStore_S3() {}
  ~RGWDelBucketMetaSearch_ObjStore_S3() {}

  void send_response() override;
};

class RGW_Auth_S3 {
public:
  static int authorize(RGWRados *store,
                       const rgw::auth::StrategyRegistry& auth_registry,
                       struct req_state *s);
};

class RGWHandler_Auth_S3 : public RGWHandler_REST {
  friend class RGWRESTMgr_S3;

  const rgw::auth::StrategyRegistry& auth_registry;

public:
  RGWHandler_Auth_S3(const rgw::auth::StrategyRegistry& auth_registry)
    : RGWHandler_REST(),
      auth_registry(auth_registry) {
  }
  ~RGWHandler_Auth_S3() override = default;

  static int validate_bucket_name(const string& bucket);
  static int validate_object_name(const string& bucket);

  int init(RGWRados *store,
           struct req_state *s,
           rgw::io::BasicClient *cio) override;
  int authorize() override {
    return RGW_Auth_S3::authorize(store, auth_registry, s);
  }
  int postauth_init() override { return 0; }
};

class RGWHandler_REST_S3 : public RGWHandler_REST {
  friend class RGWRESTMgr_S3;

  const rgw::auth::StrategyRegistry& auth_registry;
public:
  static int init_from_header(struct req_state *s, int default_formatter, bool configurable_format);

  RGWHandler_REST_S3(const rgw::auth::StrategyRegistry& auth_registry)
    : RGWHandler_REST(),
      auth_registry(auth_registry) {
  }
  ~RGWHandler_REST_S3() override = default;

  int init(RGWRados *store,
           struct req_state *s,
           rgw::io::BasicClient *cio) override;
  int authorize() override {
    return RGW_Auth_S3::authorize(store, auth_registry, s);
  }
  int postauth_init() override;
};

class RGWHandler_REST_Service_S3 : public RGWHandler_REST_S3 {
protected:
    bool is_usage_op() {
    return s->info.args.exists("usage");
  }
  RGWOp *op_get() override;
  RGWOp *op_head() override;
  RGWOp *op_post() override;
public:
  using RGWHandler_REST_S3::RGWHandler_REST_S3;
  ~RGWHandler_REST_Service_S3() override = default;
};

class RGWHandler_REST_Bucket_S3 : public RGWHandler_REST_S3 {
protected:
  bool is_acl_op() {
    return s->info.args.exists("acl");
  }
  bool is_cors_op() {
      return s->info.args.exists("cors");
  }
  bool is_lc_op() {
      return s->info.args.exists("lifecycle");
  }
  bool is_obj_update_op() override {
    return is_acl_op() || is_cors_op();
  }
  bool is_request_payment_op() {
    return s->info.args.exists("requestPayment");
  }
  bool is_policy_op() {
    return s->info.args.exists("policy");
  }
  RGWOp *get_obj_op(bool get_data);

  RGWOp *op_get() override;
  RGWOp *op_head() override;
  RGWOp *op_put() override;
  RGWOp *op_delete() override;
  RGWOp *op_post() override;
  RGWOp *op_options() override;
public:
  using RGWHandler_REST_S3::RGWHandler_REST_S3;
  ~RGWHandler_REST_Bucket_S3() override = default;
};

class RGWHandler_REST_Obj_S3 : public RGWHandler_REST_S3 {
protected:
  bool is_acl_op() {
    return s->info.args.exists("acl");
  }
  bool is_cors_op() {
      return s->info.args.exists("cors");
  }
  bool is_tagging_op() {
    return s->info.args.exists("tagging");
  }
  bool is_obj_update_op() override {
    return is_acl_op() || is_tagging_op() ;
  }
  RGWOp *get_obj_op(bool get_data);

  RGWOp *op_get() override;
  RGWOp *op_head() override;
  RGWOp *op_put() override;
  RGWOp *op_delete() override;
  RGWOp *op_post() override;
  RGWOp *op_options() override;
public:
  using RGWHandler_REST_S3::RGWHandler_REST_S3;
  ~RGWHandler_REST_Obj_S3() override = default;
};

class RGWRESTMgr_S3 : public RGWRESTMgr {
private:
  bool enable_s3website;
public:
  explicit RGWRESTMgr_S3(bool enable_s3website = false)
    : enable_s3website(enable_s3website) {
  }

  ~RGWRESTMgr_S3() override = default;

  RGWHandler_REST *get_handler(struct req_state* s,
                               const rgw::auth::StrategyRegistry& auth_registry,
                               const std::string& frontend_prefix) override;
};

class RGWHandler_REST_Obj_S3Website;

static inline bool looks_like_ip_address(const char *bucket)
{
  int num_periods = 0;
  bool expect_period = false;
  for (const char *b = bucket; *b; ++b) {
    if (*b == '.') {
      if (!expect_period)
	return false;
      ++num_periods;
      if (num_periods > 3)
	return false;
      expect_period = false;
    }
    else if (isdigit(*b)) {
      expect_period = true;
    }
    else {
      return false;
    }
  }
  return (num_periods == 3);
}

static inline int valid_s3_object_name(const string& name) {
  if (name.size() > 1024) {
    return -ERR_INVALID_OBJECT_NAME;
  }
  if (check_utf8(name.c_str(), name.size())) {
    return -ERR_INVALID_OBJECT_NAME;
  }
  return 0;
}

static inline int valid_s3_bucket_name(const string& name, bool relaxed=false)
{
  // This function enforces Amazon's spec for bucket names.
  // (The requirements, not the recommendations.)
  int len = name.size();
  if (len < 3) {
    // Name too short
    return -ERR_INVALID_BUCKET_NAME;
  } else if (len > 255) {
    // Name too long
    return -ERR_INVALID_BUCKET_NAME;
  }

  // bucket names must start with a number, letter, or underscore
  if (!(isalpha(name[0]) || isdigit(name[0]))) {
    if (!relaxed)
      return -ERR_INVALID_BUCKET_NAME;
    else if (!(name[0] == '_' || name[0] == '.' || name[0] == '-'))
      return -ERR_INVALID_BUCKET_NAME;
  }

  for (const char *s = name.c_str(); *s; ++s) {
    char c = *s;
    if (isdigit(c) || (c == '.'))
      continue;
    if (isalpha(c))
      continue;
    if ((c == '-') || (c == '_'))
      continue;
    // Invalid character
    return -ERR_INVALID_BUCKET_NAME;
  }

  if (looks_like_ip_address(name.c_str()))
    return -ERR_INVALID_BUCKET_NAME;

  return 0;
}


namespace rgw {
namespace auth {
namespace s3 {

class AWSEngine : public rgw::auth::Engine {
public:
  class VersionAbstractor {
    static constexpr size_t DIGEST_SIZE_V2 = CEPH_CRYPTO_HMACSHA1_DIGESTSIZE;
    static constexpr size_t DIGEST_SIZE_V4 = CEPH_CRYPTO_HMACSHA256_DIGESTSIZE;

    /* Knowing the signature max size allows us to employ the sstring, and thus
     * avoid dynamic allocations. The multiplier comes from representing digest
     * in the base64-encoded form. */
    static constexpr size_t SIGNATURE_MAX_SIZE = \
      ceph::max(DIGEST_SIZE_V2, DIGEST_SIZE_V4) * 2 + sizeof('\0');

  public:
    virtual ~VersionAbstractor() {};

    using access_key_id_t = boost::string_view;
    using client_signature_t = boost::string_view;
    using server_signature_t = basic_sstring<char, uint16_t, SIGNATURE_MAX_SIZE>;
    using string_to_sign_t = std::string;

    /* Transformation for crafting the AWS signature at server side which is
     * used later to compare with the user-provided one. The methodology for
     * doing that depends on AWS auth version. */
    using signature_factory_t = \
      std::function<server_signature_t(CephContext* cct,
                                       const std::string& secret_key,
                                       const string_to_sign_t& string_to_sign)>;

    /* Return an instance of Completer for verifying the payload's fingerprint
     * if necessary. Otherwise caller gets nullptr. Caller may provide secret
     * key */
    using completer_factory_t = \
      std::function<rgw::auth::Completer::cmplptr_t(
        const boost::optional<std::string>& secret_key)>;

    struct auth_data_t {
      access_key_id_t access_key_id;
      client_signature_t client_signature;
      string_to_sign_t string_to_sign;
      signature_factory_t signature_factory;
      completer_factory_t completer_factory;
    };

    virtual auth_data_t get_auth_data(const req_state* s) const = 0;
  };

protected:
  CephContext* cct;
  const VersionAbstractor& ver_abstractor;

  AWSEngine(CephContext* const cct, const VersionAbstractor& ver_abstractor)
    : cct(cct),
      ver_abstractor(ver_abstractor) {
  }

  using result_t = rgw::auth::Engine::result_t;
  using string_to_sign_t = VersionAbstractor::string_to_sign_t;
  using signature_factory_t = VersionAbstractor::signature_factory_t;
  using completer_factory_t = VersionAbstractor::completer_factory_t;

  /* TODO(rzarzynski): clean up. We've too many input parameter hee. Also
   * the signature get_auth_data() of VersionAbstractor is too complicated.
   * Replace these thing with a simple, dedicated structure. */
  virtual result_t authenticate(const boost::string_view& access_key_id,
                                const boost::string_view& signature,
                                const string_to_sign_t& string_to_sign,
                                const signature_factory_t& signature_factory,
                                const completer_factory_t& completer_factory,
                                const req_state* s) const = 0;

public:
  result_t authenticate(const req_state* const s) const final;
};


class AWSGeneralAbstractor : public AWSEngine::VersionAbstractor {
  CephContext* const cct;

  bool is_time_skew_ok(const utime_t& header_time,
                       const bool qsr) const;

  virtual boost::optional<std::string>
  get_v4_canonical_headers(const req_info& info,
                           const boost::string_view& signedheaders,
                           const bool using_qs) const;

  auth_data_t get_auth_data_v2(const req_state* s) const;
  auth_data_t get_auth_data_v4(const req_state* s, bool using_qs) const;

public:
  AWSGeneralAbstractor(CephContext* const cct)
    : cct(cct) {
  }

  auth_data_t get_auth_data(const req_state* s) const override;
};

class AWSGeneralBoto2Abstractor : public AWSGeneralAbstractor {
  boost::optional<std::string>
  get_v4_canonical_headers(const req_info& info,
                           const boost::string_view& signedheaders,
                           const bool using_qs) const override;

public:
  using AWSGeneralAbstractor::AWSGeneralAbstractor;
};

class AWSBrowserUploadAbstractor : public AWSEngine::VersionAbstractor {
  static std::string to_string(ceph::bufferlist bl) {
    return std::string(bl.c_str(),
                       static_cast<std::string::size_type>(bl.length()));
  }

  auth_data_t get_auth_data_v2(const req_state* s) const;
  auth_data_t get_auth_data_v4(const req_state* s) const;

public:
  AWSBrowserUploadAbstractor(CephContext*) {
  }

  auth_data_t get_auth_data(const req_state* s) const override;
};


class LDAPEngine : public AWSEngine {
  static rgw::LDAPHelper* ldh;
  static std::mutex mtx;

  static void init(CephContext* const cct);

  using acl_strategy_t = rgw::auth::RemoteApplier::acl_strategy_t;
  using auth_info_t = rgw::auth::RemoteApplier::AuthInfo;
  using result_t = rgw::auth::Engine::result_t;

protected:
  RGWRados* const store;
  const rgw::auth::RemoteApplier::Factory* const apl_factory;

  acl_strategy_t get_acl_strategy() const;
  auth_info_t get_creds_info(const rgw::RGWToken& token) const noexcept;

  result_t authenticate(const boost::string_view& access_key_id,
                        const boost::string_view& signature,
                        const string_to_sign_t& string_to_sign,
                        const signature_factory_t&,
                        const completer_factory_t& completer_factory,
                        const req_state* s) const override;
public:
  LDAPEngine(CephContext* const cct,
             RGWRados* const store,
             const VersionAbstractor& ver_abstractor,
             const rgw::auth::RemoteApplier::Factory* const apl_factory)
    : AWSEngine(cct, ver_abstractor),
      store(store),
      apl_factory(apl_factory) {
    init(cct);
  }

  using AWSEngine::authenticate;

  const char* get_name() const noexcept override {
    return "rgw::auth::s3::LDAPEngine";
  }
};


class LocalEngine : public AWSEngine {
  RGWRados* const store;
  const rgw::auth::LocalApplier::Factory* const apl_factory;

  result_t authenticate(const boost::string_view& access_key_id,
                        const boost::string_view& signature,
                        const string_to_sign_t& string_to_sign,
                        const signature_factory_t& signature_factory,
                        const completer_factory_t& completer_factory,
                        const req_state* s) const override;
public:
  LocalEngine(CephContext* const cct,
              RGWRados* const store,
              const VersionAbstractor& ver_abstractor,
              const rgw::auth::LocalApplier::Factory* const apl_factory)
    : AWSEngine(cct, ver_abstractor),
      store(store),
      apl_factory(apl_factory) {
  }

  using AWSEngine::authenticate;

  const char* get_name() const noexcept override {
    return "rgw::auth::s3::LocalEngine";
  }
};


class S3AnonymousEngine : public rgw::auth::AnonymousEngine {
  bool is_applicable(const req_state* s) const noexcept override;

public:
  /* Let's reuse the parent class' constructor. */
  using rgw::auth::AnonymousEngine::AnonymousEngine;

  const char* get_name() const noexcept override {
    return "rgw::auth::s3::S3AnonymousEngine";
  }
};


class S3AuthFactory : public rgw::auth::RemoteApplier::Factory,
                      public rgw::auth::LocalApplier::Factory {
  typedef rgw::auth::IdentityApplier::aplptr_t aplptr_t;
  RGWRados* const store;

public:
  S3AuthFactory(RGWRados* const store)
    : store(store) {
  }

  aplptr_t create_apl_remote(CephContext* const cct,
                             const req_state* const s,
                             rgw::auth::RemoteApplier::acl_strategy_t&& acl_alg,
                             const rgw::auth::RemoteApplier::AuthInfo info
                            ) const override {
    return aplptr_t(
      new rgw::auth::RemoteApplier(cct, store, std::move(acl_alg), info,
                                   cct->_conf->rgw_keystone_implicit_tenants));
  }

  aplptr_t create_apl_local(CephContext* const cct,
                            const req_state* const s,
                            const RGWUserInfo& user_info,
                            const std::string& subuser) const override {
      return aplptr_t(
        new rgw::auth::LocalApplier(cct, user_info, subuser));
  }
};


} /* namespace s3 */
} /* namespace auth */
} /* namespace rgw */


#endif /* CEPH_RGW_REST_S3_H */