Handle downloaded files

telegram/handlers.go

@@ -1,7 +1,10 @@
 package telegram
 
 import (
+	"crypto/sha256"
 	"fmt"
+	"os"
+	"path/filepath"
 	"strconv"
 	"strings"
 	"sync"
@@ -75,6 +78,12 @@ func (c *Client) updateHandler() {
 					uhOh()
 				}
 				c.updateDeleteMessages(typedUpdate)
+			case client.TypeUpdateFile:
+				typedUpdate, ok := update.(*client.UpdateFile)
+				if !ok {
+					uhOh()
+				}
+				c.updateFile(typedUpdate)
 			default:
 				// log only handled types
 				continue
@@ -85,17 +94,20 @@ func (c *Client) updateHandler() {
 	}
 }
 
+// new user discovered
 func (c *Client) updateUser(update *client.UpdateUser) {
 	cache.users[update.User.Id] = update.User
 	show, status := userStatusToText(update.User.Status)
 	c.processStatusUpdate(update.User.Id, status, show)
 }
 
+// user status changed
 func (c *Client) updateUserStatus(update *client.UpdateUserStatus) {
 	show, status := userStatusToText(update.Status)
 	c.processStatusUpdate(update.UserId, status, show, gateway.SPImmed(false))
 }
 
+// new chat discovered
 func (c *Client) updateNewChat(update *client.UpdateNewChat) {
 	if update.Chat != nil && update.Chat.Photo != nil && update.Chat.Photo.Small != nil {
 		_, err := c.client.DownloadFile(&client.DownloadFileRequest{
@@ -135,6 +147,7 @@ func (c *Client) updateNewChat(update *client.UpdateNewChat) {
 	}
 }
 
+// message received
 func (c *Client) updateNewMessage(update *client.UpdateNewMessage) {
 	// ignore self outgoing messages
 	if update.Message.IsOutgoing &&
@@ -186,6 +199,7 @@ func (c *Client) updateNewMessage(update *client.UpdateNewMessage) {
 	gateway.SendMessage(c.jid, strconv.Itoa(int(update.Message.ChatId)), text, c.xmpp)
 }
 
+// message content updated
 func (c *Client) updateMessageContent(update *client.UpdateMessageContent) {
 	if update.NewContent.MessageContentType() == client.TypeMessageText {
 		textContent := update.NewContent.(*client.MessageText)
@@ -194,9 +208,31 @@ func (c *Client) updateMessageContent(update *client.UpdateMessageContent) {
 	}
 }
 
+// message(s) deleted
 func (c *Client) updateDeleteMessages(update *client.UpdateDeleteMessages) {
 	if update.IsPermanent {
 		text := "✗ " + strings.Join(int64SliceToStringSlice(update.MessageIds), ",")
 		gateway.SendMessage(c.jid, strconv.FormatInt(update.ChatId, 10), text, c.xmpp)
 	}
 }
+
+// file downloaded
+func (c *Client) updateFile(update *client.UpdateFile) {
+	// not really
+	if !update.File.Local.IsDownloadingCompleted {
+		return
+	}
+
+	err := os.Symlink(
+		update.File.Local.Path,
+		fmt.Sprintf(
+			"%s/%s%s",
+			c.content.Path,
+			fmt.Sprintf("%x", sha256.Sum256([]byte(update.File.Remote.Id))),
+			filepath.Ext(update.File.Local.Path),
+		),
+	)
+	if err != nil {
+		log.Errorf("Error creating symlink: %v", err)
+	}
+}