invites.go

// Copyright 2018-2021 CERN
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.

package ocmd

import (
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"mime"
	"net/http"
	"net/url"

	userpb "github.com/cs3org/go-cs3apis/cs3/identity/user/v1beta1"
	invitepb "github.com/cs3org/go-cs3apis/cs3/ocm/invite/v1beta1"
	ocmprovider "github.com/cs3org/go-cs3apis/cs3/ocm/provider/v1beta1"
	rpc "github.com/cs3org/go-cs3apis/cs3/rpc/v1beta1"
	"github.com/cs3org/reva/pkg/appctx"
	ctxpkg "github.com/cs3org/reva/pkg/ctx"
	"github.com/cs3org/reva/pkg/rgrpc/todo/pool"
	"github.com/cs3org/reva/pkg/rhttp/router"
	"github.com/cs3org/reva/pkg/smtpclient"
	"github.com/cs3org/reva/pkg/utils"
)

type invitesHandler struct {
	smtpCredentials  *smtpclient.SMTPCredentials
	gatewayAddr      string
	meshDirectoryURL string
}

func (h *invitesHandler) init(c *Config) {
	h.gatewayAddr = c.GatewaySvc
	if c.SMTPCredentials != nil {
		h.smtpCredentials = smtpclient.NewSMTPCredentials(c.SMTPCredentials)
	}
	h.meshDirectoryURL = c.MeshDirectoryURL
}

func (h *invitesHandler) Handler() http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		log := appctx.GetLogger(r.Context())
		var head string
		head, r.URL.Path = router.ShiftPath(r.URL.Path)
		log.Debug().Str("head", head).Str("tail", r.URL.Path).Msg("http routing")

		switch head {
		case "":
			h.generateInviteToken(w, r)
		case "forward":
			h.forwardInvite(w, r)
		case "accept":
			h.acceptInvite(w, r)
		case "find-accepted-users":
			h.findAcceptedUsers(w, r)
		case "generate":
			h.generate(w, r)
		default:
			w.WriteHeader(http.StatusNotFound)
		}
	})
}

func (h *invitesHandler) generateInviteToken(w http.ResponseWriter, r *http.Request) {

	ctx := r.Context()

	gatewayClient, err := pool.GetGatewayServiceClient(pool.Endpoint(h.gatewayAddr))
	if err != nil {
		WriteError(w, r, APIErrorServerError, "error getting gateway grpc client", err)
		return
	}

	token, err := gatewayClient.GenerateInviteToken(ctx, &invitepb.GenerateInviteTokenRequest{})
	if err != nil {
		WriteError(w, r, APIErrorServerError, "error generating token", err)
		return
	}

	if r.FormValue("recipient") != "" && h.smtpCredentials != nil {

		usr := ctxpkg.ContextMustGetUser(ctx)

		// TODO: the message body needs to point to the meshdirectory service
		subject := fmt.Sprintf("ScienceMesh: %s wants to collaborate with you", usr.DisplayName)
		body := "Hi,\n\n" +
			usr.DisplayName + " (" + usr.Mail + ") wants to start sharing OCM resources with you. " +
			"To accept the invite, please visit the following URL:\n" +
			h.meshDirectoryURL + "?token=" + token.InviteToken.Token + "&providerDomain=" + usr.Id.Idp + "\n\n" +
			"Alternatively, you can visit your mesh provider and use the following details:\n" +
			"Token: " + token.InviteToken.Token + "\n" +
			"ProviderDomain: " + usr.Id.Idp + "\n\n" +
			"Best,\nThe ScienceMesh team"

		err = h.smtpCredentials.SendMail(r.FormValue("recipient"), subject, body)
		if err != nil {
			WriteError(w, r, APIErrorServerError, "error sending token by mail", err)
			return
		}
	}

	jsonResponse, err := json.Marshal(token.InviteToken)
	if err != nil {
		WriteError(w, r, APIErrorServerError, "error marshalling token data", err)
		return
	}

	// Write response
	_, err = w.Write(jsonResponse)
	if err != nil {
		WriteError(w, r, APIErrorServerError, "error writing token data", err)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusOK)
}

func (h *invitesHandler) forwardInvite(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()
	log := appctx.GetLogger(ctx)
	contentType, _, err := mime.ParseMediaType(r.Header.Get("Content-Type"))
	var token, providerDomain string
	if err == nil && contentType == "application/json" {
		defer r.Body.Close()
		reqBody, err := io.ReadAll(r.Body)
		if err == nil {
			reqMap := make(map[string]string)
			err = json.Unmarshal(reqBody, &reqMap)
			if err == nil {
				token, providerDomain = reqMap["token"], reqMap["providerDomain"]
			}
		}
	} else {
		token, providerDomain = r.FormValue("token"), r.FormValue("providerDomain")
	}
	if token == "" || providerDomain == "" {
		WriteError(w, r, APIErrorInvalidParameter, "token and providerDomain must not be null", nil)
		return
	}

	gatewayClient, err := pool.GetGatewayServiceClient(pool.Endpoint(h.gatewayAddr))
	if err != nil {
		WriteError(w, r, APIErrorServerError, "error getting gateway grpc client", err)
		return
	}

	inviteToken := &invitepb.InviteToken{
		Token: token,
	}

	providerInfo, err := gatewayClient.GetInfoByDomain(ctx, &ocmprovider.GetInfoByDomainRequest{
		Domain: providerDomain,
	})
	if err != nil {
		WriteError(w, r, APIErrorServerError, "error sending a grpc get invite by domain info request", err)
		return
	}
	if providerInfo.Status.Code != rpc.Code_CODE_OK {
		WriteError(w, r, APIErrorServerError, "grpc forward invite request failed", errors.New(providerInfo.Status.Message))
		return
	}

	forwardInviteReq := &invitepb.ForwardInviteRequest{
		InviteToken:          inviteToken,
		OriginSystemProvider: providerInfo.ProviderInfo,
	}
	forwardInviteResponse, err := gatewayClient.ForwardInvite(ctx, forwardInviteReq)
	if err != nil {
		WriteError(w, r, APIErrorServerError, "error sending a grpc forward invite request", err)
		return
	}
	if forwardInviteResponse.Status.Code != rpc.Code_CODE_OK {
		WriteError(w, r, APIErrorServerError, "grpc forward invite request failed", errors.New(forwardInviteResponse.Status.Message))
		return
	}

	_, err = w.Write([]byte("Accepted invite from: " + providerDomain))
	if err != nil {
		WriteError(w, r, APIErrorServerError, "error writing token data", err)
		return
	}
	w.WriteHeader(http.StatusOK)

	log.Info().Msgf("Invite forwarded to: %s", providerDomain)
}

func (h *invitesHandler) acceptInvite(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()
	log := appctx.GetLogger(ctx)
	contentType, _, err := mime.ParseMediaType(r.Header.Get("Content-Type"))
	var token, userID, recipientProvider, name, email string
	if err == nil && contentType == "application/json" {
		defer r.Body.Close()
		reqBody, err := io.ReadAll(r.Body)
		if err == nil {
			reqMap := make(map[string]string)
			err = json.Unmarshal(reqBody, &reqMap)
			if err == nil {
				token, userID, recipientProvider = reqMap["token"], reqMap["userID"], reqMap["recipientProvider"]
				name, email = reqMap["name"], reqMap["email"]
			}
		}
	} else {
		token, userID, recipientProvider = r.FormValue("token"), r.FormValue("userID"), r.FormValue("recipientProvider")
		name, email = r.FormValue("name"), r.FormValue("email")
	}
	if token == "" || userID == "" || recipientProvider == "" {
		WriteError(w, r, APIErrorInvalidParameter, "missing parameters in request", nil)
		return
	}

	gatewayClient, err := pool.GetGatewayServiceClient(pool.Endpoint(h.gatewayAddr))
	if err != nil {
		WriteError(w, r, APIErrorServerError, "error getting gateway grpc client", err)
		return
	}

	clientIP, err := utils.GetClientIP(r)
	if err != nil {
		WriteError(w, r, APIErrorServerError, fmt.Sprintf("error retrieving client IP from request: %s", r.RemoteAddr), err)
		return
	}

	recipientProviderURL, err := url.Parse(recipientProvider)
	if err != nil {
		WriteError(w, r, APIErrorServerError, fmt.Sprintf("error parseing recipientProvider URL: %s", recipientProvider), err)
		return
	}

	providerInfo := ocmprovider.ProviderInfo{
		Domain: recipientProviderURL.Hostname(),
		Services: []*ocmprovider.Service{
			{
				Host: clientIP,
			},
		},
	}

	providerAllowedResp, err := gatewayClient.IsProviderAllowed(ctx, &ocmprovider.IsProviderAllowedRequest{
		Provider: &providerInfo,
	})
	if err != nil {
		WriteError(w, r, APIErrorServerError, "error sending a grpc is provider allowed request", err)
		return
	}
	if providerAllowedResp.Status.Code != rpc.Code_CODE_OK {
		WriteError(w, r, APIErrorUnauthenticated, "provider not authorized", errors.New(providerAllowedResp.Status.Message))
		return
	}

	userObj := &userpb.User{
		Id: &userpb.UserId{
			OpaqueId: userID,
			Idp:      recipientProvider,
			Type:     userpb.UserType_USER_TYPE_PRIMARY,
		},
		Mail:        email,
		DisplayName: name,
	}
	acceptInviteRequest := &invitepb.AcceptInviteRequest{
		InviteToken: &invitepb.InviteToken{
			Token: token,
		},
		RemoteUser: userObj,
	}
	acceptInviteResponse, err := gatewayClient.AcceptInvite(ctx, acceptInviteRequest)
	if err != nil {
		WriteError(w, r, APIErrorServerError, "error sending a grpc accept invite request", err)
		return
	}
	if acceptInviteResponse.Status.Code != rpc.Code_CODE_OK {
		WriteError(w, r, APIErrorServerError, "grpc accept invite request failed", errors.New(acceptInviteResponse.Status.Message))
		return
	}

	log.Info().Msgf("User: %+v added to accepted users.", userObj)
}

func (h *invitesHandler) findAcceptedUsers(w http.ResponseWriter, r *http.Request) {
	log := appctx.GetLogger(r.Context())

	ctx := r.Context()
	gatewayClient, err := pool.GetGatewayServiceClient(pool.Endpoint(h.gatewayAddr))
	if err != nil {
		WriteError(w, r, APIErrorServerError, "error getting gateway grpc client", err)
		return
	}

	response, err := gatewayClient.FindAcceptedUsers(ctx, &invitepb.FindAcceptedUsersRequest{
		Filter: "",
	})
	if err != nil {
		WriteError(w, r, APIErrorServerError, "error sending a grpc find accepted users request", err)
		return
	}

	indentedResponse, _ := json.MarshalIndent(response, "", "   ")
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusOK)
	if _, err := w.Write(indentedResponse); err != nil {
		log.Err(err).Msg("Error writing to ResponseWriter")
	}
}

func (h *invitesHandler) generate(w http.ResponseWriter, r *http.Request) {
	log := appctx.GetLogger(r.Context())

	ctx := r.Context()
	gatewayClient, err := pool.GetGatewayServiceClient(pool.Endpoint(h.gatewayAddr))
	if err != nil {
		WriteError(w, r, APIErrorServerError, "error getting gateway grpc client", err)
		return
	}

	response, err := gatewayClient.GenerateInviteToken(ctx, &invitepb.GenerateInviteTokenRequest{})
	if err != nil {
		WriteError(w, r, APIErrorServerError, "error sending a grpc generate invite token request", err)
		return
	}

	indentedResponse, _ := json.MarshalIndent(response, "", "   ")
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusOK)
	if _, err := w.Write(indentedResponse); err != nil {
		log.Err(err).Msg("Error writing to ResponseWriter")
	}
}