Add TLSConfig to nctalk (#1195)

Signed-off-by: Gary Kim <gary@garykim.dev>

11 files changed, 294 insertions, 20 deletions

diff --git a/vendor/gomod.garykim.dev/nc-talk/.drone.yml b/vendor/gomod.garykim.dev/nc-talk/.drone.yml
index c57fa083..f2367e4d 100644
--- a/vendor/gomod.garykim.dev/nc-talk/.drone.yml
+++ b/vendor/gomod.garykim.dev/nc-talk/.drone.yml
@@ -7,6 +7,10 @@ steps:
     image: golangci/golangci-lint:latest-alpine
     commands:
       - golangci-lint run
+  - name: test
+    image: golang:1.13
+    commands:
+      - go test ./...
   - name: build-test
     image: golang:1.13
     commands:
diff --git a/vendor/gomod.garykim.dev/nc-talk/CHANGELOG.md b/vendor/gomod.garykim.dev/nc-talk/CHANGELOG.md
index 40d50615..405a2112 100644
--- a/vendor/gomod.garykim.dev/nc-talk/CHANGELOG.md
+++ b/vendor/gomod.garykim.dev/nc-talk/CHANGELOG.md
@@ -5,6 +5,43 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [v0.1.1](https://github.com/gary-kim/go-nc-talk/tree/v0.1.1) - 2020-08-24
+
+[Full Changelog](https://github.com/gary-kim/go-nc-talk/compare/v0.1.0...v0.1.1)
+
+### Fixed
+
+- ROS type should be of ROST type [\#12](https://github.com/gary-kim/go-nc-talk/pull/12) ([@gary-kim](https://github.com/gary-kim))
+- Fix error when sending a message with no RCS data [\#10](https://github.com/gary-kim/go-nc-talk/pull/10) ([@gary-kim](https://github.com/gary-kim))
+
+## [v0.1.0](https://github.com/gary-kim/go-nc-talk/tree/v0.1.0) - 2020-08-13
+
+[Full Changelog](https://github.com/gary-kim/go-nc-talk/compare/v0.0.2...v0.1.0)
+
+### Added
+
+- Add TLSConfig [\#9](https://github.com/gary-kim/go-nc-talk/pull/9) ([@gary-kim](https://github.com/gary-kim))
+- Add Software using this library in README [\#8](https://github.com/gary-kim/go-nc-talk/pull/8) ([@gary-kim](https://github.com/gary-kim))
+- Add some basic tests [\#7](https://github.com/gary-kim/go-nc-talk/pull/7) ([@gary-kim](https://github.com/gary-kim))
+- Add support for downloading files [\#1](https://github.com/gary-kim/go-nc-talk/pull/1) ([@gary-kim](https://github.com/gary-kim))
+
+### Fixed
+
+- Return error on blank token [\#6](https://github.com/gary-kim/go-nc-talk/pull/6) ([@gary-kim](https://github.com/gary-kim))
+- Add v0.0.2 to changelog [\#4](https://github.com/gary-kim/go-nc-talk/pull/4) ([@gary-kim](https://github.com/gary-kim))
+
+## [v0.0.2](https://github.com/gary-kim/go-nc-talk/tree/v0.0.2) - 2020-07-26
+
+[Full Changelog](https://github.com/gary-kim/go-nc-talk/compare/v0.0.1...v0.0.2)
+
+### Changed
+
+- Add installation instructions to README.md [\#2](https://github.com/gary-kim/go-nc-talk/pull/2) ([@gary-kim](https://github.com/gary-kim))
+
+### Fixed
+
+- Fix Capabilities Request [\#3](https://github.com/gary-kim/go-nc-talk/pull/3) ([@gary-kim](https://github.com/gary-kim))
+
 ## [v0.0.1](https://github.com/gary-kim/riotchat/tree/v0.0.1) - 2020-07-10
 
 * First release
diff --git a/vendor/gomod.garykim.dev/nc-talk/README.md b/vendor/gomod.garykim.dev/nc-talk/README.md
index 54300182..efa87c6c 100644
--- a/vendor/gomod.garykim.dev/nc-talk/README.md
+++ b/vendor/gomod.garykim.dev/nc-talk/README.md
@@ -15,6 +15,11 @@ GO111MODULE=on go get gomod.garykim.dev/nc-talk
 
 Check out the documentation for the package [here](https://pkg.go.dev/gomod.garykim.dev/nc-talk).
 
+
+### Software using this library
+
+* [Matterbridge](https://github.com/42wim/matterbridge)
+
 ### License
 
 Copyright © 2020 Gary Kim &lt;<gary@garykim.dev>&gt;, All Rights Reserved
diff --git a/vendor/gomod.garykim.dev/nc-talk/constants/constants.go b/vendor/gomod.garykim.dev/nc-talk/constants/constants.go
index de56f162..c70e4daa 100644
--- a/vendor/gomod.garykim.dev/nc-talk/constants/constants.go
+++ b/vendor/gomod.garykim.dev/nc-talk/constants/constants.go
@@ -18,3 +18,8 @@ const (
 	// BaseEndpoint is the api endpoint for Nextcloud Talk
 	BaseEndpoint = "/ocs/v2.php/apps/spreed/api/v1/"
 )
+
+// RemoteDavEndpoint returns the endpoint for the Dav API for Nextcloud
+func RemoteDavEndpoint(username string, davType string) string {
+	return "/remote.php/dav/" + username + "/" + davType + "/"
+}
diff --git a/vendor/gomod.garykim.dev/nc-talk/go.mod b/vendor/gomod.garykim.dev/nc-talk/go.mod
index f5a4afd9..1aa51ff7 100644
--- a/vendor/gomod.garykim.dev/nc-talk/go.mod
+++ b/vendor/gomod.garykim.dev/nc-talk/go.mod
@@ -2,4 +2,7 @@ module gomod.garykim.dev/nc-talk
 
 go 1.13
 
-require github.com/monaco-io/request v1.0.3
+require (
+	github.com/monaco-io/request v1.0.4
+	github.com/stretchr/testify v1.6.1
+)
diff --git a/vendor/gomod.garykim.dev/nc-talk/go.sum b/vendor/gomod.garykim.dev/nc-talk/go.sum
index 9f29c486..b4d32468 100644
--- a/vendor/gomod.garykim.dev/nc-talk/go.sum
+++ b/vendor/gomod.garykim.dev/nc-talk/go.sum
@@ -1,2 +1,15 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/monaco-io/request v1.0.3 h1:FsiIwXCCbHEyWx9A7lgg6JBTMHhHlEEsADsgAOvZ9HA=
 github.com/monaco-io/request v1.0.3/go.mod h1:EmggwHktBsbJmCgwZXqy7o0H1NNsAstQBWZrFVd3xtQ=
+github.com/monaco-io/request v1.0.4 h1:AbogA+IvPOWqyGZIFU7kSb8YS2Jv5Dnl5ncMj8cQV+o=
+github.com/monaco-io/request v1.0.4/go.mod h1:EmggwHktBsbJmCgwZXqy7o0H1NNsAstQBWZrFVd3xtQ=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0 h1:4G4v2dO3VZwixGIRoQ5Lfboy6nUhCyYzaqnIAPPhYs4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
+github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/vendor/gomod.garykim.dev/nc-talk/gonctalk.go b/vendor/gomod.garykim.dev/nc-talk/gonctalk.go
index e334fef2..727d5006 100644
--- a/vendor/gomod.garykim.dev/nc-talk/gonctalk.go
+++ b/vendor/gomod.garykim.dev/nc-talk/gonctalk.go
@@ -21,6 +21,8 @@ import (
 
 // NewUser returns a TalkUser instance
 // The url should be the full URL of the Nextcloud instance (e.g. https://cloud.mydomain.me)
+//
+// Deprecated: Use user.NewUser instead for more options and error checks
 func NewUser(url string, username string, password string) *user.TalkUser {
 	return &user.TalkUser{
 		NextcloudURL: url,
@@ -31,6 +33,8 @@ func NewUser(url string, username string, password string) *user.TalkUser {
 
 // NewRoom returns a new TalkRoom instance
 // Token should be the Nextcloud Room Token (e.g. "d6zoa2zs" if the room URL is https://cloud.mydomain.me/call/d6zoa2zs)
+//
+// Deprecated: Use room.NewRoom instead for extra error checks.
 func NewRoom(tuser *user.TalkUser, token string) *room.TalkRoom {
 	tr := &room.TalkRoom{
 		User:  tuser,
diff --git a/vendor/gomod.garykim.dev/nc-talk/ocs/message.go b/vendor/gomod.garykim.dev/nc-talk/ocs/message.go
index 6093e638..e23078de 100644
--- a/vendor/gomod.garykim.dev/nc-talk/ocs/message.go
+++ b/vendor/gomod.garykim.dev/nc-talk/ocs/message.go
@@ -14,6 +14,11 @@
 
 package ocs
 
+import (
+	"encoding/json"
+	"strings"
+)
+
 // MessageType describes what kind of message a returned Nextcloud Talk message is
 type MessageType string
 
@@ -30,23 +35,108 @@ const (
 
 // TalkRoomMessageData describes the data part of a ocs response for a Talk room message
 type TalkRoomMessageData struct {
-	Message          string      `json:"message"`
-	ID               int         `json:"id"`
-	ActorID          string      `json:"actorId"`
-	ActorDisplayName string      `json:"actorDisplayName"`
-	SystemMessage    string      `json:"systemMessage"`
-	Timestamp        int         `json:"timestamp"`
-	MessageType      MessageType `json:"messageType"`
+	Message           string                      `json:"message"`
+	ID                int                         `json:"id"`
+	ActorID           string                      `json:"actorId"`
+	ActorDisplayName  string                      `json:"actorDisplayName"`
+	SystemMessage     string                      `json:"systemMessage"`
+	Timestamp         int                         `json:"timestamp"`
+	MessageType       MessageType                 `json:"messageType"`
+	MessageParameters map[string]RichObjectString `json:"-"`
+}
+
+// talkRoomMessageParameters is used to unmarshal only MessageParameters
+type talkRoomMessageParameters struct {
+	MessageParameters map[string]RichObjectString `json:"messageParameters"`
+}
+
+// PlainMessage returns the message string with placeholders replaced
+//
+// * User and group placeholders will be replaced with the name of the user or group respectively.
+//
+// * File placeholders will be replaced with the name of the file.
+func (m *TalkRoomMessageData) PlainMessage() string {
+	tr := m.Message
+	for key, value := range m.MessageParameters {
+		tr = strings.ReplaceAll(tr, "{"+key+"}", value.Name)
+	}
+	return tr
 }
 
 // TalkRoomMessage describes an ocs response for a Talk room message
 type TalkRoomMessage struct {
+	OCS talkRoomMessage `json:"ocs"`
+}
+
+type talkRoomMessage struct {
 	ocs
 	TalkRoomMessage []TalkRoomMessageData `json:"data"`
 }
 
+// TalkRoomMessageDataUnmarshal unmarshals given ocs request data and returns a TalkRoomMessageData
+func TalkRoomMessageDataUnmarshal(data *[]byte) (*TalkRoomMessage, error) {
+	message := &TalkRoomMessage{}
+	err := json.Unmarshal(*data, message)
+	if err != nil {
+		return nil, err
+	}
+
+	// Get RCS
+	var rcs struct {
+		OCS struct {
+			ocs
+			TalkRoomMessage []talkRoomMessageParameters `json:"data"`
+		} `json:"ocs"`
+	}
+	err = json.Unmarshal(*data, &rcs)
+	// There is no RCS data
+	if err != nil {
+		for i := range message.OCS.TalkRoomMessage {
+			message.OCS.TalkRoomMessage[i].MessageParameters = map[string]RichObjectString{}
+		}
+		return message, nil
+	}
+
+	// There is RCS data
+	for i := range message.OCS.TalkRoomMessage {
+		message.OCS.TalkRoomMessage[i].MessageParameters = rcs.OCS.TalkRoomMessage[i].MessageParameters
+	}
+	return message, nil
+}
+
 // TalkRoomSentResponse describes an ocs response for what is returned when a message is sent
 type TalkRoomSentResponse struct {
+	OCS talkRoomSentResponse `json:"ocs"`
+}
+
+type talkRoomSentResponse struct {
 	ocs
 	TalkRoomMessage TalkRoomMessageData `json:"data"`
 }
+
+// TalkRoomSentResponseUnmarshal unmarshals given ocs request data and returns a TalkRoomMessageData
+func TalkRoomSentResponseUnmarshal(data *[]byte) (*TalkRoomSentResponse, error) {
+	message := &TalkRoomSentResponse{}
+	err := json.Unmarshal(*data, message)
+	if err != nil {
+		return nil, err
+	}
+
+	// Get RCS
+	var rcs struct {
+		OCS struct {
+			ocs
+			TalkRoomMessage talkRoomMessageParameters `json:"data"`
+		} `json:"ocs"`
+	}
+	err = json.Unmarshal(*data, &rcs)
+	// There is no RCS data
+	if err != nil {
+		message.OCS.TalkRoomMessage.MessageParameters = map[string]RichObjectString{}
+		return message, nil
+	}
+
+	// There is RCS data
+	message.OCS.TalkRoomMessage.MessageParameters = rcs.OCS.TalkRoomMessage.MessageParameters
+	return message, nil
+}
diff --git a/vendor/gomod.garykim.dev/nc-talk/ocs/ros.go b/vendor/gomod.garykim.dev/nc-talk/ocs/ros.go
new file mode 100644
index 00000000..82f72bb0
--- /dev/null
+++ b/vendor/gomod.garykim.dev/nc-talk/ocs/ros.go
@@ -0,0 +1,38 @@
+// Copyright (c) 2020 Gary Kim <gary@garykim.dev>, All Rights Reserved
+//
+// 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.
+
+// File describes Nextcloud's Rich Object Strings (https://github.com/nextcloud/server/issues/1706)
+
+package ocs
+
+// RichObjectString describes the content of placeholders in TalkRoomMessageData
+type RichObjectString struct {
+	Type RichObjectStringType `json:"type"`
+	ID   string               `json:"id"`
+	Name string               `json:"name"`
+	Path string               `json:"path"`
+	Link string               `json:"link"`
+}
+
+// RichObjectStringType describes what a rich object string is describing
+type RichObjectStringType string
+
+const (
+	// ROSTypeUser describes a rich object string that is a user
+	ROSTypeUser RichObjectStringType = "user"
+	// ROSTypeGroup describes a rich object string that is a group
+	ROSTypeGroup RichObjectStringType = "group"
+	// ROSTypeFile describes a rich object string that is a file
+	ROSTypeFile RichObjectStringType = "file"
+)
diff --git a/vendor/gomod.garykim.dev/nc-talk/room/room.go b/vendor/gomod.garykim.dev/nc-talk/room/room.go
index d8faf7c4..5452993d 100644
--- a/vendor/gomod.garykim.dev/nc-talk/room/room.go
+++ b/vendor/gomod.garykim.dev/nc-talk/room/room.go
@@ -16,7 +16,6 @@ package room
 
 import (
 	"context"
-	"encoding/json"
 	"errors"
 	"io/ioutil"
 	"time"
@@ -28,12 +27,38 @@ import (
 	"gomod.garykim.dev/nc-talk/user"
 )
 
+var (
+	// ErrEmptyToken is returned when the room token is empty
+	ErrEmptyToken = errors.New("given an empty token")
+	// ErrRoomNotFound is returned when a room with the given token could not be found
+	ErrRoomNotFound = errors.New("room could not be found")
+	// ErrNotModeratorInLobby is returned when the room is in lobby mode but the user is not a moderator
+	ErrNotModeratorInLobby = errors.New("room is in lobby mode but user is not a moderator")
+	// ErrUnexpectedReturnCode is returned when the server did not respond with an expected return code
+	ErrUnexpectedReturnCode = errors.New("unexpected return code")
+)
+
 // TalkRoom represents a room in Nextcloud Talk
 type TalkRoom struct {
 	User  *user.TalkUser
 	Token string
 }
 
+// NewTalkRoom returns a new TalkRoom instance
+// Token should be the Nextcloud Room Token (e.g. "d6zoa2zs" if the room URL is https://cloud.mydomain.me/call/d6zoa2zs)
+func NewTalkRoom(tuser *user.TalkUser, token string) (*TalkRoom, error) {
+	if token == "" {
+		return nil, ErrEmptyToken
+	}
+	if tuser == nil {
+		return nil, user.ErrUserIsNil
+	}
+	return &TalkRoom{
+		User:  tuser,
+		Token: token,
+	}, nil
+}
+
 // SendMessage sends a message in the Talk room
 func (t *TalkRoom) SendMessage(msg string) (*ocs.TalkRoomMessageData, error) {
 	url := t.User.NextcloudURL + constants.BaseEndpoint + "/chat/" + t.Token
@@ -51,18 +76,22 @@ func (t *TalkRoom) SendMessage(msg string) (*ocs.TalkRoomMessageData, error) {
 		return nil, err
 	}
 	if res.StatusCode() != 201 {
-		return nil, errors.New("unexpected return code")
+		return nil, ErrUnexpectedReturnCode
 	}
-	var msgInfo struct {
-		OCS ocs.TalkRoomSentResponse `json:"ocs"`
+	msgInfo, err := ocs.TalkRoomSentResponseUnmarshal(&res.Data)
+	if err != nil {
+		return nil, err
 	}
-	err = json.Unmarshal(res.Data, &msgInfo)
 	return &msgInfo.OCS.TalkRoomMessage, err
 }
 
 // ReceiveMessages starts watching for new messages
 func (t *TalkRoom) ReceiveMessages(ctx context.Context) (chan ocs.TalkRoomMessageData, error) {
 	c := make(chan ocs.TalkRoomMessageData)
+	err := t.TestConnection()
+	if err != nil {
+		return nil, err
+	}
 	url := t.User.NextcloudURL + constants.BaseEndpoint + "/chat/" + t.Token
 	requestParam := map[string]string{
 		"lookIntoFuture":   "1",
@@ -99,14 +128,11 @@ func (t *TalkRoom) ReceiveMessages(ctx context.Context) (chan ocs.TalkRoomMessag
 			}
 			if res.StatusCode == 200 {
 				lastKnown = res.Header.Get("X-Chat-Last-Given")
-				var message struct {
-					OCS ocs.TalkRoomMessage `json:"ocs"`
-				}
 				data, err := ioutil.ReadAll(res.Body)
 				if err != nil {
 					continue
 				}
-				err = json.Unmarshal(data, &message)
+				message, err := ocs.TalkRoomMessageDataUnmarshal(&data)
 				if err != nil {
 					continue
 				}
@@ -121,6 +147,9 @@ func (t *TalkRoom) ReceiveMessages(ctx context.Context) (chan ocs.TalkRoomMessag
 
 // TestConnection tests the connection with the Nextcloud Talk instance and returns an error if it could not connect
 func (t *TalkRoom) TestConnection() error {
+	if t.Token == "" {
+		return ErrEmptyToken
+	}
 	url := t.User.NextcloudURL + constants.BaseEndpoint + "/chat/" + t.Token
 	requestParam := map[string]string{
 		"lookIntoFuture":   "0",
@@ -142,9 +171,9 @@ func (t *TalkRoom) TestConnection() error {
 	case 304:
 		return nil
 	case 404:
-		return errors.New("room could not be found")
+		return ErrRoomNotFound
 	case 412:
-		return errors.New("room is in lobby mode but user is not a moderator")
+		return ErrNotModeratorInLobby
 	}
-	return errors.New("unknown return code")
+	return ErrUnexpectedReturnCode
 }
diff --git a/vendor/gomod.garykim.dev/nc-talk/user/user.go b/vendor/gomod.garykim.dev/nc-talk/user/user.go
index 03d7ec8b..2f8a3c0a 100644
--- a/vendor/gomod.garykim.dev/nc-talk/user/user.go
+++ b/vendor/gomod.garykim.dev/nc-talk/user/user.go
@@ -15,11 +15,14 @@
 package user
 
 import (
+	"crypto/tls"
 	"encoding/json"
+	"errors"
 	"strings"
 
 	"github.com/monaco-io/request"
 
+	"gomod.garykim.dev/nc-talk/constants"
 	"gomod.garykim.dev/nc-talk/ocs"
 )
 
@@ -27,14 +30,25 @@ const (
 	ocsCapabilitiesEndpoint = "/ocs/v2.php/cloud/capabilities"
 )
 
+var (
+	// ErrUserIsNil is returned when a funciton is called with an nil user.
+	ErrUserIsNil = errors.New("user is nil")
+)
+
 // TalkUser represents a user of Nextcloud Talk
 type TalkUser struct {
 	User         string
 	Pass         string
 	NextcloudURL string
+	Config       *TalkUserConfig
 	capabilities *Capabilities
 }
 
+// TalkUserConfig is configuration options for TalkUsers
+type TalkUserConfig struct {
+	TLSConfig *tls.Config
+}
+
 // Capabilities describes the capabilities that the Nextcloud Talk instance is capable of. Visit https://nextcloud-talk.readthedocs.io/en/latest/capabilities/ for more info.
 type Capabilities struct {
 	AttachmentsFolder      string `ocscapability:"config => attachments => folder"`
@@ -70,6 +84,17 @@ type Capabilities struct {
 	ChatReferenceID        bool `ocscapability:"chat-reference-id"`
 }
 
+// NewUser returns a TalkUser instance
+// The url should be the full URL of the Nextcloud instance (e.g. https://cloud.mydomain.me)
+func NewUser(url string, username string, password string, config *TalkUserConfig) (*TalkUser, error) {
+	return &TalkUser{
+		NextcloudURL: url,
+		User:         username,
+		Pass:         password,
+		Config:       config,
+	}, nil
+}
+
 // RequestClient returns a monaco-io that is preconfigured to make OCS API calls
 func (t *TalkUser) RequestClient(client request.Client) *request.Client {
 	if client.Header == nil {
@@ -91,6 +116,11 @@ func (t *TalkUser) RequestClient(client request.Client) *request.Client {
 		client.URL = t.NextcloudURL + "/" + client.URL
 	}
 
+	// Set TLS Config
+	if t.Config != nil {
+		client.TLSConfig = t.Config.TLSConfig
+	}
+
 	return &client
 }
 
@@ -166,3 +196,19 @@ func sliceContains(s []string, search string) bool {
 	}
 	return false
 }
+
+// DownloadFile downloads the file at the given path
+//
+// Meant to be used with rich object string's path.
+func (t *TalkUser) DownloadFile(path string) (data *[]byte, err error) {
+	url := t.NextcloudURL + constants.RemoteDavEndpoint(t.User, "files") + path
+	c := t.RequestClient(request.Client{
+		URL: url,
+	})
+	res, err := c.Do()
+	if err != nil || res.StatusCode() != 200 {
+		return
+	}
+	data = &res.Data
+	return
+}