[SHELL] 使用 命令 將訊息傳到 Sleck

[SHELL] 使用 命令 將訊息傳到 Sleck How to post message from command-line into Slack

感謝這個網站 https://blog.sleeplessbeastie.eu/2017/06/12/how-to-post-message-from-command-line-into-slack/

使用定義好的webhook將命令行中的消息作為參數，標準輸入或文件發佈到Slack中，利用顏色，圖標和標記來辨識消息。

Shell script The following shell script provides an easy way to post message carried as a parameter, standard input or a file.

#!/bin/bash
# send message to slack channel

# define the boundaries after which the message will be sent will be sent as an attachment
# count "c" characters or "l" lines from stdin 
stdin_check="l"
# define number of characters or lines from stdin
stdin_count="2"

# define usage function
function usage {
  echo "Basic connection parameters:"
  echo " -h hook_url"
  echo " -c channel"
  echo " -u username"
  echo " -i icon"
  echo " -p enable|disable (markdown)"
  echo
  echo "Define message using file contents:"
  echo " -F \"file\""
  echo " -C color"
  echo " -T \"title\""
  echo
  echo "Define message using parameter:"
  echo " -m \"message\""
  echo
  echo "Otherwise, define message using standard input."
  echo
}

# curl is an essential application used to send message
if ! command -v curl &>/dev/null; then
  echo "Error: curl is missing"
  exit 1
fi

# display usage if no arguments are passed
if [ "$#" = "0" ];then
  usage;
  exit;
fi

# parse arguments
while getopts "h:c:u:m:i:C:F:T:p:" option; do
  case $option in
    "h")
      slack_hook_url=${OPTARG}
      ;;
    "c")
      slack_channel=${OPTARG}
      ;;
    "u")
      slack_username=${OPTARG}
      ;;
    "i")
      slack_icon=${OPTARG}
      ;;
    "C")
      slack_color=${OPTARG}
      ;;
    "F")
      slack_file=${OPTARG}
      ;;
    "T")
      slack_title=$(echo -e "${OPTARG}" | sed 's/\"/\\"/g' | sed "s/'/\'/g" | sed 's/`/\`/g')
      ;;
    "p")
      if [ "${OPTARG}" == "disable" ]; then
        slack_markdown="false"
      else
        slack_markdown="true"
      fi
      ;;
    "m")
      slack_message=${OPTARG}
      ;;
    \?|:)
      usage
      exit
      ;;
    esac
done

# verify basic parameters
if [ -z "$slack_hook_url" ] || [ -z "$slack_channel" ] || [ -z "$slack_username" ]; then
  echo "Error: Basic connection parameters are missing"
  exit 1
fi

# set default icon if not defined
if [ -z "$slack_icon" ]; then
  slack_icon="ghost"
fi

# read message 
if [ -n "$slack_file" ]; then
  if [ -f "$slack_file" ]; then
    # read message using file (-F)
    file=$(cat $slack_file)
  else
    echo "Error: File not found"
    exit 1
  fi
fi
if [ -n "$slack_message" ]; then
  # read message (-m) message parameter
  message="$slack_message"
else 
  if [ ! -t 0 ]; then 
    # read message from stdin
    message=$(cat /dev/stdin)
  fi
fi

# define header and color
if [ -n "$slack_title" ]; then
  title="\"title\":\"${slack_title}\" ,"
  if [ -z "$slack_file" ]; then
    file="$message"
    slack_file="/dev/null"
  fi
else
  title=""
fi

if [ -n "$slack_color" ]; then
  color="\"color\":\"${slack_color}\" ,"
  if [ -z "$slack_file" ]; then
    file="$message"
    slack_file="/dev/null"
  fi
else
  color=""
fi
# do not send empty message
if [ -z "${message}" ] && [ -z "${file}" ]; then
  echo "Error: There is nothing to send"
  exit 1
fi

# send message as attachment if it is bigger then defined values so it can be folded up
if [ -z "$slack_file" ]; then
  count=$(echo -e "${message}" | wc -${stdin_check})
  if [ "$count" -gt "$stdin_count" ]; then
    # activate small cheat
    file="$message"
    slack_file="/dev/null"
  fi
fi

# escape message and prepare text property
if [ -n "${message}" ]; then
  escaped_message=$(echo -e "${message}" | sed 's/\"/\\"/g' | sed "s/'/\'/g" | sed 's/`/\`/g')
  text="\"text\": \"${escaped_message}\""
fi

# escape file contents and prepare text property
if [ -n "${file}" ]; then
  escaped_file=$(echo -e "${file}" | sed 's/\"/\\"/g' | sed "s/'/\'/g" | sed 's/`/\`/g')
  file="\"text\": \"${escaped_file}\""
fi

# define json
markdown="\"mrkdwn\": false,"
if [ -n "$slack_file" ]; then
  if [ "$slack_markdown" == "true" ]; then
    markdown="\"mrkdwn_in\": [\"text\"],"
  fi
  json="{\"channel\": \"${slack_channel}\", \"username\":\"${slack_username}\", \"icon_emoji\":\":${slack_icon}:\", \"attachments\":[{ ${color} ${title} ${markdown} ${file}}]}"
else
  if [ "$slack_markdown" == "true" ]; then
    markdown="\"mrkdwn\": true,"
  fi
  json="{\"channel\": \"${slack_channel}\", \"username\":\"${slack_username}\", \"icon_emoji\":\":${slack_icon}:\", ${markdown} ${text}}"
fi

# send message
curl -s -d "payload=$json" $slack_hook_url

使用方式 顯示使用資訊

$ bash slack_message.sh

Basic connection parameters:
 -h hook_url
 -c channel
 -u username
 -i icon
 -p enable|disable (markdown)

Define message using file contents:
 -F "file"
 -C color
 -T "title"

Define message using parameter:
 -m "message"

Otherwise, define message using standard input.

一些範例

bash slack_message.sh -h https://hooks.slack.com/services/xxxxxxxxxx/xxxxxxxxxxx/xxxxxxxxxxxx -c system-operations -u sysopsusr -i penguin -m "$(hostname) timezone is  $(cat /etc/timezone)"

多行訊息

$ bash slack_message.sh -h https://hooks.slack.com/services/D21FA21F/F9PATXG7R/38BepMtJ5NxF8yV2fQsHjen1 -c system-operations -u sysopsusr -i terminal -C 1974D2 -m "$(hostname) timezone is  $(cat /etc/timezone)\nDatetime is $(date)"

檔案訊息

$ bash slack_message.sh -h https://hooks.slack.com/services/D21FA21F/F9PATXG7R/38BepMtJ5NxF8yV2fQsHjen1 -c system-operations -u sysopsusr -i terminal -F /proc/mdstat -T "$(hostname) software raid status"

輸入訊息

$ df -h | sed -e '1s/^/```/' -e '$a```' | bash slack_message.sh -h https://hooks.slack.com/services/D21FA21F/F9PATXG7R/38BepMtJ5NxF8yV2fQsHjen1 -c system-operations -u sysopsusr -i comet -C F79F66 -p enable -T "$(hostname) system disk space usage" 

Additional information Use color to indicate success or failure. Enable markdown to enhance your message using its simple syntax. Define the boundaries (number of lines or a number of characters) after which the message will be sent as an attachment. Remember about optional title header as it can help you to shortly describe long messages, especially those including files.