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msteams.go
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msteams.go
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package msteams
import (
"context"
"encoding/json"
"fmt"
"net/url"
"strings"
"time"
"github.com/google/uuid"
s2herrors "github.com/agoda-com/samsahai/internal/errors"
s2hlog "github.com/agoda-com/samsahai/internal/log"
"github.com/agoda-com/samsahai/internal/util/http"
)
var logger = s2hlog.S2HLog.WithName("MS-Teams-util")
const requestTimeout = 5 * time.Second
const (
tokenAPI = "%s/%s/oauth2/v2.0/token" // base login url, tenantID
postMessageAPI = "%s/teams/%s/channels/%s/messages" // base graph url, groupID, channelID
profileAPI = "%s/me" // base graph url
channelInfoAPI = "%s/teams/%s/channels/%s" // base graph url, groupID, channelID
joinedTeamsAPI = "%s/users/%s/joinedTeams" // base graph url, userID
channelsAPI = "%s/teams/%s/channels" // base graph url, groupID
)
// MSTeams is the interface of Microsoft Teams using Microsoft Graph api
type MSTeams interface {
// GetAccessToken returns an access token on behalf of a user
GetAccessToken() (string, error)
//PostMessage posts message to the given Microsoft Teams group and channel
PostMessage(groupID, channelID, message, accessToken string, opts ...PostMsgOption) error
// GetGroupID returns group id from group name or id
GetGroupID(groupNameOrID, accessToken string) (string, error)
// GetGroupID returns channel id from channel name or id
GetChannelID(groupID, channelNameOrID, accessToken string) (string, error)
}
var _ MSTeams = &Client{}
// Client manages client side of Microsoft Graph api
type Client struct {
tenantID string
clientID string
clientSecret string
username string
password string
contentType MessageContentType
baseLoginURL string
baseGraphURL string
}
// NewOption allows specifying various configuration
type NewOption func(*Client)
// WithBaseURL specifies base api url to override when creating Microsoft Teams Client
func WithBaseURL(baseLoginURL, baseGraphURL string) NewOption {
return func(r *Client) {
r.baseLoginURL = baseLoginURL
r.baseGraphURL = baseGraphURL
}
}
// NewClient creates a new client of MSTeams
func NewClient(tenantID, clientID, clientSecret, username, password string, opts ...NewOption) *Client {
client := &Client{
tenantID: tenantID,
clientID: clientID,
clientSecret: clientSecret,
username: username,
password: password,
contentType: PlainText,
baseLoginURL: "https://login.microsoftonline.com",
baseGraphURL: "https://graph.microsoft.com/beta",
}
// apply the new options
for _, opt := range opts {
opt(client)
}
return client
}
// GetAccessToken returns an access token on behalf of a user
func (c *Client) GetAccessToken() (string, error) {
logger.Debug("getting Microsoft Teams access token")
timeout := 5 * time.Second
tokenAPI := fmt.Sprintf(tokenAPI, c.baseLoginURL, c.tenantID)
resCh := make(chan []byte, 1)
errCh := make(chan error, 1)
ctx, cancelFunc := context.WithTimeout(context.Background(), timeout)
defer cancelFunc()
go func() {
opts := []http.Option{
http.WithTimeout(timeout),
http.WithContext(ctx),
http.WithHeader("Content-Type", "application/x-www-form-urlencoded"),
}
reqBody := url.Values{}
reqBody.Set("grant_type", "password")
reqBody.Set("client_id", c.clientID)
reqBody.Set("client_secret", c.clientSecret)
reqBody.Set("scope", "https://graph.microsoft.com/.default")
reqBody.Set("userName", c.username)
reqBody.Set("password", c.password)
_, res, err := postRequest(tokenAPI, []byte(reqBody.Encode()), opts...)
if err != nil {
errCh <- err
return
}
resCh <- res
}()
select {
case <-ctx.Done():
logger.Error(s2herrors.ErrRequestTimeout,
fmt.Sprintf("getting access token took longer than %v", requestTimeout))
return "", s2herrors.ErrRequestTimeout
case err := <-errCh:
logger.Error(err, "cannot get access token")
return "", err
case res := <-resCh:
var respJSON struct {
AccessToken string `json:"access_token"`
}
if err := json.Unmarshal(res, &respJSON); err != nil {
logger.Error(err, "cannot unmarshal access token json response")
return "", err
}
return respJSON.AccessToken, nil
}
}
type messageReq struct {
Body messageBody `json:"body"`
}
type messageBody struct {
ContentType string `json:"contentType,omitempty"`
Content string `json:"content"`
}
// PostMsgOption allows specifying various configuration
type PostMsgOption func(*Client)
// MessageContentType defines a message content type
type MessageContentType string
const (
PlainText MessageContentType = "text"
HTML MessageContentType = "html"
)
func WithContentType(contentType MessageContentType) PostMsgOption {
return func(c *Client) {
c.contentType = contentType
}
}
// PostMessage implements the Microsoft Teams PostMessage function
func (c *Client) PostMessage(groupID, channelID, message, accessToken string, opts ...PostMsgOption) error {
logger.Debug("Posting message", "groupID", groupID, "channelID", channelID)
// apply the new options
for _, opt := range opts {
opt(c)
}
timeout := 10 * time.Second
postMessageAPI := fmt.Sprintf(postMessageAPI, c.baseGraphURL, groupID, channelID)
resCh := make(chan []byte, 1)
errCh := make(chan error, 1)
ctx, cancelFunc := context.WithTimeout(context.Background(), timeout)
defer cancelFunc()
go func() {
for {
if accessToken == "" {
var err error
accessToken, err = c.GetAccessToken()
if err != nil {
errCh <- err
return
}
}
opts := []http.Option{
http.WithTimeout(timeout),
http.WithContext(ctx),
http.WithHeader("Authorization", accessToken),
}
reqJSON := messageReq{
Body: messageBody{
ContentType: string(c.contentType),
Content: message,
},
}
reqBody, err := json.Marshal(reqJSON)
if err != nil {
logger.Error(err, "cannot marshal request data", "data", reqBody)
errCh <- err
return
}
respCode, res, err := postRequest(postMessageAPI, reqBody, opts...)
if err != nil {
// reset access token if it's expired
if respCode == 401 {
accessToken = ""
continue
}
errCh <- err
return
}
resCh <- res
return
}
}()
select {
case <-ctx.Done():
logger.Error(s2herrors.ErrRequestTimeout,
fmt.Sprintf("posting message to groupID: %s, channelID: %s took longer than %v",
groupID, channelID, requestTimeout))
return s2herrors.ErrRequestTimeout
case err := <-errCh:
logger.Error(err, "cannot post message", "groupID", groupID, "channelID", channelID)
return err
case <-resCh:
logger.Info("message successfully sent to channel",
"groupID", groupID, "channelID", channelID)
return nil
}
}
// GetGroupID implements the Microsoft Teams GetGroupID function
func (c *Client) GetGroupID(groupNameOrID, accessToken string) (string, error) {
if !validateGroupID(groupNameOrID) {
return c.getMatchedGroupID(groupNameOrID, accessToken)
}
return groupNameOrID, nil
}
// GetChannelID implements the Microsoft Teams GetChannelID function
func (c *Client) GetChannelID(groupID, channelNameOrID, accessToken string) (string, error) {
if err := c.getChannelInfo(groupID, channelNameOrID, accessToken); err != nil {
return c.getMatchedChannelID(groupID, channelNameOrID, accessToken)
}
return channelNameOrID, nil
}
// getMatchedGroupID returns group id of the given group name
func (c *Client) getMatchedGroupID(groupName, accessToken string) (string, error) {
timeout := 30 * time.Second
userID, err := c.getMyUserID(accessToken)
if err != nil {
logger.Error(err, "cannot get user id of ms teams application")
return "", err
}
groupIDCh := make(chan string, 1)
errCh := make(chan error, 1)
ctx, cancelFunc := context.WithTimeout(context.Background(), timeout)
defer cancelFunc()
go func() {
nextLink := ""
for {
if accessToken == "" {
var err error
accessToken, err = c.GetAccessToken()
if err != nil {
errCh <- err
return
}
}
getGroupsAPI := nextLink
if nextLink == "" {
getGroupsAPI = fmt.Sprintf(joinedTeamsAPI, c.baseGraphURL, userID)
}
opts := []http.Option{
http.WithTimeout(requestTimeout),
http.WithContext(ctx),
http.WithHeader("Authorization", accessToken),
}
respCode, res, err := getRequest(getGroupsAPI, opts...)
if err != nil {
// reset access token if it's expired
if respCode == 401 {
accessToken = ""
continue
}
errCh <- err
return
}
var respJSON struct {
NextLink string `json:"@odata.nextLink,omitempty"`
Values []struct {
ID string `json:"id"`
DisplayName string `json:"displayName"`
} `json:"value"`
}
if err := json.Unmarshal(res, &respJSON); err != nil {
errCh <- err
return
}
for _, group := range respJSON.Values {
if strings.TrimSpace(groupName) == strings.TrimSpace(group.DisplayName) {
groupIDCh <- group.ID
return
}
}
nextLink = respJSON.NextLink
if nextLink == "" {
errCh <- fmt.Errorf("group %s not found", groupName)
return
}
}
}()
select {
case <-ctx.Done():
logger.Error(s2herrors.ErrRequestTimeout,
fmt.Sprintf("getting joined team lists took longer than %v", requestTimeout))
return "", s2herrors.ErrRequestTimeout
case err := <-errCh:
logger.Error(err, "cannot get joined team lists")
return "", err
case groupID := <-groupIDCh:
return groupID, nil
}
}
// getMatchedChannelID returns channel id of the given channel name
func (c *Client) getMatchedChannelID(groupID, channelName, accessToken string) (string, error) {
timeout := 30 * time.Second
channelIDCh := make(chan string, 1)
errCh := make(chan error, 1)
ctx, cancelFunc := context.WithTimeout(context.Background(), timeout)
defer cancelFunc()
go func() {
nextLink := ""
for {
if accessToken == "" {
var err error
accessToken, err = c.GetAccessToken()
if err != nil {
errCh <- err
return
}
}
getChannelsAPI := nextLink
if nextLink == "" {
getChannelsAPI = fmt.Sprintf(channelsAPI, c.baseGraphURL, groupID)
}
opts := []http.Option{
http.WithTimeout(requestTimeout),
http.WithContext(ctx),
http.WithHeader("Authorization", accessToken),
}
respCode, res, err := getRequest(getChannelsAPI, opts...)
if err != nil {
// reset access token if it's expired
if respCode == 401 {
accessToken = ""
continue
}
errCh <- err
return
}
var respJSON struct {
NextLink string `json:"@odata.nextLink,omitempty"`
Values []struct {
ID string `json:"id"`
DisplayName string `json:"displayName"`
} `json:"value"`
}
if err := json.Unmarshal(res, &respJSON); err != nil {
errCh <- err
return
}
for _, channel := range respJSON.Values {
if strings.TrimSpace(channelName) == strings.TrimSpace(channel.DisplayName) {
channelIDCh <- channel.ID
return
}
}
nextLink = respJSON.NextLink
if nextLink == "" {
errCh <- fmt.Errorf("channel %s not found", channelName)
return
}
}
}()
select {
case <-ctx.Done():
logger.Error(s2herrors.ErrRequestTimeout,
fmt.Sprintf("getting channels of groupID %s took longer than %v", groupID, requestTimeout))
return "", s2herrors.ErrRequestTimeout
case err := <-errCh:
logger.Error(err, "cannot get channels")
return "", err
case channelID := <-channelIDCh:
return channelID, nil
}
}
func (c *Client) getMyUserID(accessToken string) (string, error) {
logger.Debug("getting service account ID of MS Teams app")
resCh := make(chan []byte, 1)
errCh := make(chan error, 1)
ctx, cancelFunc := context.WithTimeout(context.Background(), requestTimeout)
defer cancelFunc()
go func() {
for {
opts := []http.Option{
http.WithTimeout(requestTimeout),
http.WithContext(ctx),
http.WithHeader("Authorization", accessToken),
}
profileAPI := fmt.Sprintf(profileAPI, c.baseGraphURL)
respCode, res, err := getRequest(profileAPI, opts...)
if err != nil {
// reset access token if it's expired
if respCode == 401 {
accessToken = ""
continue
}
errCh <- err
return
}
resCh <- res
}
}()
select {
case <-ctx.Done():
logger.Error(s2herrors.ErrRequestTimeout,
fmt.Sprintf("getting user profile took longer than %v", requestTimeout))
return "", s2herrors.ErrRequestTimeout
case err := <-errCh:
logger.Error(err, "cannot get user profile")
return "", err
case res := <-resCh:
var respJSON struct {
ID string `json:"id"`
}
if err := json.Unmarshal(res, &respJSON); err != nil {
logger.Error(err, "cannot unmarshal user profile json response")
return "", err
}
return respJSON.ID, nil
}
}
func (c *Client) getChannelInfo(groupID, channelNameOrID, accessToken string) error {
channelInfoAPI := fmt.Sprintf(channelInfoAPI, c.baseGraphURL, groupID, channelNameOrID)
resCh := make(chan []byte, 1)
errCh := make(chan error, 1)
ctx, cancelFunc := context.WithTimeout(context.Background(), requestTimeout)
defer cancelFunc()
go func() {
for {
if accessToken == "" {
var err error
accessToken, err = c.GetAccessToken()
if err != nil {
errCh <- err
return
}
}
opts := []http.Option{
http.WithTimeout(requestTimeout),
http.WithContext(ctx),
http.WithHeader("Authorization", accessToken),
}
respCode, res, err := getRequest(channelInfoAPI, opts...)
if err != nil {
// reset access token if it's expired
if respCode == 401 {
accessToken = ""
continue
}
errCh <- err
return
}
resCh <- res
}
}()
select {
case <-ctx.Done():
logger.Error(s2herrors.ErrRequestTimeout,
fmt.Sprintf("getting channel info of groupID: %s, channel: %s took longer than %v",
groupID, channelNameOrID, requestTimeout))
return s2herrors.ErrRequestTimeout
case err := <-errCh:
return err
case <-resCh:
return nil
}
}
func getRequest(reqURL string, opts ...http.Option) (int, []byte, error) {
respCode, res, err := http.Get(reqURL, opts...)
if err != nil {
return respCode, []byte{}, err
}
return respCode, res, nil
}
func postRequest(reqURL string, body []byte, opts ...http.Option) (int, []byte, error) {
respCode, res, err := http.Post(reqURL, body, opts...)
if err != nil {
return respCode, []byte{}, err
}
return respCode, res, nil
}
func validateGroupID(groupID string) bool {
_, err := uuid.Parse(groupID)
return err == nil
}