Added a switch -R to download a file sent to the bot.

telegram

@@ -14,6 +14,7 @@ CRON_MODE=0
 ACTION=""
 
 URL="https://api.telegram.org/bot"
+FILE_URL="https://api.telegram.org/file/bot"
 CURL_OPTIONS="-s"
 
 HAS_JQ=false
@@ -34,6 +35,7 @@ function help {
 	echo "    -C               Sends text as monospace code. Useful when piping command outputs into this tool."
 	echo "    -r               Like -C, but if the first line starts with '+ ', it is specially formatted."
 	echo "    -l               Fetch known chat_ids."
+	echo "    -R               Receive a file sent via telegram."
 	echo
 	echo "DEBUGGING OPTIONS are:"
 	echo "    -v               Display lots of more or less useful information."
@@ -89,6 +91,50 @@ function list_chats {
 	fi
 }
 
+function receive_file {
+	if [ "$HAS_JQ" = false ]; then
+		echo "You need to have jq installed in order to be able to download files."
+		exit 1
+	fi
+	
+	result=`curl $CURL_OPTIONS $URL$TOKEN/getUpdates?allowed_updates=message`
+	log "$result"
+	# {"ok":true,"result":[
+	#   {
+	#     "update_id":441727866,
+	#     "message":{
+	#       "message_id":8339,
+	#       "from":{"id":15773,"is_bot":false,"first_name":"Fabian","last_name":"Schlenz","username":"fabianonline","language_code":"de"},
+	#       "chat":{"id":15773,"first_name":"Fabian","last_name":"Schlenz","username":"fabianonline","type":"private"},
+	#       "date":1526564127,
+	#       "document":{"file_name":"desktop.ini","file_id":"BQAav-HkXugI","file_size":282}}}]}
+	file_id=`jq -r '.result[-1].message.document.file_id' <<< "$result"`
+	log "file_id: $file_id"
+	if [ "$file_id" == "null" ]; then
+		echo "Last message received apparently didn't contain a file. Aborting."
+		exit 1
+	fi
+	file_name=`jq -r '.result[-1].message.document.file_name' <<< "$result"`
+	log "file_name: $file_name"
+	result=`curl $CURL_OPTIONS $URL$TOKEN/getFile?file_id=$file_id`
+	log $result
+	# {"ok":true,"result":{"file_id":"BQAav-HkXugI","file_size":282,"file_path":"documents/file_271.ini"}}
+	path=`jq -r '.result.file_path' <<< "$result"`
+	log "path: $path"
+	if [ "$path" == "null" ]; then
+		echo "Could not parse telegram's response to getFile. Aborting."
+		exit 1
+	fi
+	file_name="`date +%s`_$file_name"
+	log "file_name: $file_name"
+	if [ -e "$file_name" ]; then
+		echo "File $file_name already exists. This is unexpected, so I'm quitting now."
+		exit 1
+	fi
+	curl $FILE_URL$TOKEN/$path --output "$file_name"
+	echo "File downloaded as $file_name"
+}
+
 function log {
 	[ "$DEBUG" = true ] && echo "DEBUG: $1"
 }
@@ -101,7 +147,7 @@ function escapeMarkdown {
 	echo "$res"
 }
 
-while getopts "t:c:i:f:MHCrhlvjn" opt; do
+while getopts "t:c:i:f:MHCrhlvjnR" opt; do
 	case $opt in
 		t)
 			TOKEN="$OPTARG"
@@ -141,6 +187,9 @@ while getopts "t:c:i:f:MHCrhlvjn" opt; do
 		n)
 			DRY_RUN=true
 			;;
+		R)
+			ACTION="receive_file"
+			;;
 		?|h)
 			help
 			;;
@@ -202,6 +251,11 @@ if [ "$ACTION" = "list_chats" ]; then
 	exit 0
 fi
 
+if [ "$ACTION" = "receive_file" ]; then
+	receive_file
+	exit 0
+fi
+
 shift $((OPTIND - 1))
 TEXT="$1"
 log "Text: $TEXT"