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function.go
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function.go
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package zoombackup
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"log"
"net"
"net/http"
"strings"
"time"
"cloud.google.com/go/storage"
"github.com/dgrijalva/jwt-go"
"github.com/gobuffalo/envy"
"google.golang.org/api/iterator"
)
const (
zoomRecordingsURL = "https://api.zoom.us/v2/users/%s/recordings?from=%s"
zoomDeleteRecordingsURL = "https://api.zoom.us/v2/meetings/%s/recordings"
ymdFormat = "2006-01-02"
tokenExpiresIn = 35 * time.Minute
dateFormatFrom = "2006-01-02"
dateFormatTo = "01-02-2006" // MM-DD-YYYY
dateLength = 10
)
type recordingListResponse struct {
Meetings []struct {
ID string `json:"uuid"`
Topic string `json:"topic"`
StartTime string `json:"start_time"`
RecordingFiles []recordingFile `json:"recording_files"`
} `json:"meetings"`
}
type meeting struct {
ID string `json:"id"`
Topic string `json:"topic"`
StartTime string `json:"start_time"`
Files []recordingFile `json:"files"`
}
type recordingFile struct {
RecordingStart string `json:"recording_start"`
FileType string `json:"file_type"`
DownloadURL string `json:"download_url"`
RecordingType string `json:"recording_type"`
Status string `json:"status"`
}
func ZoomBackup(w http.ResponseWriter, r *http.Request) {
zoomAPIKey := envy.Get("ZOOM_API_KEY", "")
if zoomAPIKey == "" {
log.Fatal("Please set ZOOM_API_KEY to access the zoom API.")
}
zoomAPISecret := envy.Get("ZOOM_API_SECRET", "")
if zoomAPISecret == "" {
log.Fatal("Please set ZOOM_API_SECRET to access the zoom API.")
}
zoomJWT, err := jwt.NewWithClaims(jwt.SigningMethodHS256, &jwt.StandardClaims{
ExpiresAt: time.Now().Add(tokenExpiresIn).Unix(),
Issuer: zoomAPIKey,
}).SignedString([]byte(zoomAPISecret))
if err != nil {
err = fmt.Errorf("failed to sign JWT: %w", err)
log.Fatal(err)
}
zoomUserID := envy.Get("ZOOM_USER_ID", "")
if zoomUserID == "" {
log.Fatal("Please set ZOOM_USER_ID from which to retreive recording.")
}
bucket := envy.Get("GSTORAGE_BUCKET", "")
if bucket == "" {
log.Fatal("Please set GSTORAGE_BUCKET with a bucket as a backup destination")
}
ctx := context.Background()
storageClient, err := storage.NewClient(ctx)
if err != nil {
log.Fatal("Error creating new storage client ", err)
}
meetings, err := fetchRecordings(zoomJWT, zoomUserID)
if err != nil {
err = fmt.Errorf("failed to fetch recordings: %w", err)
log.Fatal(err)
}
for _, meeting := range meetings {
for _, recording := range meeting.Files {
fileName := recording.FileName()
log.Println("Requesting", fileName)
body, err := requestRecordingFile(recording.DownloadURL, zoomJWT)
if err != nil {
err = fmt.Errorf("failed to request download file: %w", err)
log.Println(err)
continue
}
defer body.Close()
fileSaveName, err := getFileSaveName(meeting.StartTime, meeting.Topic, recording.FileName())
if err != nil {
err = fmt.Errorf("failed to get file save name: %w", err)
log.Println(err)
continue
}
log.Println("Getting writer", fileSaveName)
sw := storageWriter(ctx, storageClient, bucket, fileSaveName)
log.Println("Copying", fileName)
if _, err := io.Copy(sw, body); err != nil {
err = fmt.Errorf("Could not write file: %v", err)
log.Println(err)
continue
}
log.Println("Closing", fileName)
if err := sw.Close(); err != nil {
err = fmt.Errorf("Could not put file: %v", err)
log.Println(err)
continue
}
log.Println("Finished", recording.FileName())
}
log.Println("Deleting recordings for", meeting.ID)
err = deleteMeetingRecordings(zoomJWT, meeting.ID)
if err != nil {
log.Println(err)
}
}
if err := generateURLSListHTML(ctx, storageClient, bucket); err != nil {
err = fmt.Errorf("Could not generate html file: %v", err)
log.Println(err)
}
}
func (f recordingFile) FileName() string {
return fmt.Sprintf(
"%s-%s.%s",
f.RecordingStart,
f.RecordingType,
strings.ToLower(f.FileType),
)
}
func requestRecordingFile(fileURL, zoomJWT string) (io.ReadCloser, error) {
recURL := fileURL + "?access_token=" + zoomJWT
req, err := http.NewRequest("GET", recURL, nil)
if err != nil {
err = fmt.Errorf("failed to create new HTTP request for recording download: %w", err)
return nil, err
}
req.Header.Add("Accept", "application/json")
resp, err := defaultHTTPClient.Do(req)
if err != nil {
err = fmt.Errorf("failed to perform request to download recording: %w", err)
return nil, err
}
if resp.StatusCode/200 != 1 {
err = fmt.Errorf("invalid recording download response code: %d", resp.StatusCode)
return nil, err
}
return resp.Body, nil
}
func fetchRecordings(zoomJWT, zoomUserID string) ([]meeting, error) {
req, err := http.NewRequest("GET", fmt.Sprintf(zoomRecordingsURL, zoomUserID, time.Now().AddDate(0, -1, 0).Format(ymdFormat)), nil)
if err != nil {
err = fmt.Errorf("failed to create new HTTP request for recordings: %w", err)
return nil, err
}
req.Header.Add("Accept", "application/json")
req.Header.Add("Authorization", "Bearer "+zoomJWT)
resp, err := defaultHTTPClient.Do(req)
if err != nil {
err = fmt.Errorf("failed to perform request for recordings: %w", err)
return nil, err
}
buf := new(bytes.Buffer)
_, err = buf.ReadFrom(resp.Body)
_ = resp.Body.Close()
if err != nil {
err = fmt.Errorf("failed to read recordings response body: %w", err)
return nil, err
}
if resp.StatusCode/200 != 1 {
err = fmt.Errorf("invalid recordings response code: %s", buf.String())
return nil, err
}
response := &recordingListResponse{}
err = json.Unmarshal(buf.Bytes(), response)
if err != nil {
err = fmt.Errorf("failed to unmarshal recordings response: %w", err)
return nil, err
}
meetings := make([]meeting, len(response.Meetings))
for i, meeting := range response.Meetings {
meetings[i].ID = meeting.ID
meetings[i].Topic = meeting.Topic
meetings[i].StartTime = meeting.StartTime
for _, file := range meeting.RecordingFiles {
if file.Status == "completed" && file.FileType == "MP4" {
meetings[i].Files = append(meetings[i].Files, file)
}
}
}
return meetings, nil
}
func deleteMeetingRecordings(zoomJWT, meetingID string) error {
req, err := http.NewRequest("DELETE", fmt.Sprintf(zoomDeleteRecordingsURL, meetingID), nil)
if err != nil {
err = fmt.Errorf("failed to create new HTTP request to delete recordings: %w", err)
return err
}
req.Header.Add("Accept", "application/json")
req.Header.Add("Authorization", "Bearer "+zoomJWT)
resp, err := defaultHTTPClient.Do(req)
if err != nil {
err = fmt.Errorf("failed to delete recordings: %w", err)
return err
}
if resp.StatusCode != http.StatusNoContent {
buf := new(bytes.Buffer)
_, err = buf.ReadFrom(resp.Body)
_ = resp.Body.Close()
if err != nil {
err = fmt.Errorf("failed to read delete recordings response body: %w", err)
return err
}
err = fmt.Errorf("invalid delete recordings response code: %d -- %s", resp.StatusCode, buf.String())
return err
}
return nil
}
var defaultHTTPClient = &http.Client{
Timeout: time.Second * 15 * 60,
Transport: &http.Transport{
Dial: (&net.Dialer{
Timeout: time.Second * 10,
}).Dial,
TLSHandshakeTimeout: time.Second * 10,
},
}
func storageWriter(ctx context.Context, storageClient *storage.Client, bucket, filename string) *storage.Writer {
return storageClient.Bucket(bucket).Object(filename).NewWriter(ctx)
}
func getFileSaveName(startTime, Topic, recordingFileName string) (string, error) {
var folderName string
meetingDate, err := time.Parse(dateFormatFrom, startTime[:dateLength])
if err != nil {
return "", fmt.Errorf("failed to parse date: %w", err)
}
if Topic != "" {
folderName = fmt.Sprintf("%s-", Topic)
}
folderName += fmt.Sprintf("%s", meetingDate.Format(dateFormatTo))
fileSaveName := folderName + "/" + recordingFileName
return fileSaveName, nil
}
func generateURLSListHTML(ctx context.Context, storageClient *storage.Client, bucket string) error {
html := openHTML()
it := storageClient.Bucket(bucket).Objects(ctx, nil)
for {
attrs, err := it.Next()
if err == iterator.Done {
break
}
if err != nil {
return fmt.Errorf("Bucket(%q).Objects: %v", bucket, err)
}
html += addLinkHTML(bucket, attrs.Name)
}
html += closeHTML()
htmlFileName := "biga.html"
obj := storageClient.Bucket(bucket).Object(htmlFileName)
wc := obj.NewWriter(ctx)
if _, err := io.Copy(wc, bytes.NewBuffer([]byte(html))); err != nil {
return fmt.Errorf("Could not write file: %v", err)
}
if err := wc.Close(); err != nil {
return fmt.Errorf("error closing: %w", err)
}
return nil
}
func openHTML() string {
return "<html><body><h2>Kitchen Rodeos</h2><ul>"
}
func closeHTML() string {
return "</ul></body></html>"
}
func addLinkHTML(bucket, fileName string) string {
link := fmt.Sprintf("http://%s/%s", bucket, fileName)
return fmt.Sprintf("<li><a href=\"%s\">%s</a></li>", link, fileName)
}