Post a message to Microsoft Teams with bash script.

teams-chat-post-for-workflows.sh

#!/bin/bash
# =============================================================================
#  Author: Chu-Siang Lai / chusiang (at) drx.tw
#  Filename: teams-chat-post-for-workflows.sh
#  Modified: 2024-07-22 11:44 (UTC+08:00)
#  Description: Post a message to Microsoft Teams via "Post to a chat when a webhook request is received" workflows.
#  Reference:
#
#   - https://gist.github.com/chusiang/895f6406fbf9285c58ad0a3ace13d025
#   - https://devblogs.microsoft.com/microsoft365dev/retirement-of-office-365-connectors-within-microsoft-teams/
#   - https://adaptivecards.io/explorer/
#   - https://adaptivecards.io/designer/
#
# =============================================================================

# Help.
if [[ "$1" == "-h" || "$1" == "--help" ]]; then
  echo 'Usage: teams-chat-post.sh "<webhook_url>" "<title>" "<color>" "<message>"'
  exit 0
fi

# Webhook or Token.
WEBHOOK_URL=$1
if [[ "${WEBHOOK_URL}" == "" ]]; then
  echo "No webhook_url specified."
  exit 1
fi
shift

# Title .
TITLE=$1
if [[ "${TITLE}" == "" ]]; then
  echo "No title specified."
  exit 1
fi
shift

# Color.
COLOR=$1
if [[ "${COLOR}" == "" ]]; then
  echo "No status specified."
  exit 1
fi
shift

# Text.
TEXT=$*
if [[ "${TEXT}" == "" ]]; then
  echo "No text specified."
  exit 1
fi

ATTACHMENTS=$*
if [[ "${TEXT}" == "" ]]; then
  echo "No text specified."
  exit 1
fi

# Escape char: `'`, `"`, `\` .
MESSAGE=$(echo ${TEXT} | sed "s/'/\'/g" | sed 's/"/\"/g; s/\\/\\\\/g')

# Adaptive Cards of TextBlock - https://adaptivecards.io/explorer/TextBlock.html
JSON="{
  \"type\": \"message\",
  \"attachments\": [
    {
      \"contentType\": \"application/vnd.microsoft.card.adaptive\",
      \"contentUrl\": null,
      \"content\": {
        \"$schema\": \"http://adaptivecards.io/schemas/adaptive-card.json\",
        \"type\": \"AdaptiveCard\",
        \"version\": \"1.2\",
        \"body\": [
          {
            \"type\":   \"TextBlock\",
            \"text\":   \"${TITLE}\",
            \"color\":  \"${COLOR}\",
            \"weight\": \"bolder\",
            \"size\":   \"large\",
            \"wrap\":   true
          },
          {
            \"type\":   \"TextBlock\",
            \"text\":   \"${MESSAGE}\",
            \"color\":  \"${COLOR}\",
            \"size\":   \"small\",
            \"wrap\":   true
          }
        ]
      }
    }
  ]
}"

# Post to Microsoft Teams via curl.
curl \
  --header "Content-Type: application/json" \
  --request POST \
  --data "${JSON}" \
  "${WEBHOOK_URL}"

teams-chat-post.sh

#!/bin/bash
# =============================================================================
#  Author: Chu-Siang Lai / chusiang (at) drx.tw
#  Filename: teams-chat-post.sh
#  Modified: 2024-07-12 18:49 (UTC+08:00)
#  Description: Post a message to Microsoft Teams via connectors, not support
#               Power Automate workflows.
#  Reference:
#
#   - https://gist.github.com/chusiang/895f6406fbf9285c58ad0a3ace13d025
#   - https://devblogs.microsoft.com/microsoft365dev/retirement-of-office-365-connectors-within-microsoft-teams/
#   - Fixed for workflows edition: https://gist.github.com/chusiang/895f6406fbf9285c58ad0a3ace13d025?permalink_comment_id=5119162#gistcomment-5119162
#
# =============================================================================

# Help.
if [[ "$1" == "-h" || "$1" == "--help" ]]; then
  echo 'Usage: teams-chat-post.sh "<webhook_url>" "<title>" "<color>" "<message>"'
  exit 0
fi

# Webhook or Token.
WEBHOOK_URL=$1
if [[ "${WEBHOOK_URL}" == "" ]]; then
  echo "No webhook_url specified."
  exit 1
fi
shift

# Title .
TITLE=$1
if [[ "${TITLE}" == "" ]]; then
  echo "No title specified."
  exit 1
fi
shift

# Color.
COLOR=$1
if [[ "${COLOR}" == "" ]]; then
  echo "No status specified."
  exit 1
fi
shift

# Text.
TEXT=$*
if [[ "${TEXT}" == "" ]]; then
  echo "No text specified."
  exit 1
fi

# Convert formating.
MESSAGE=$(echo ${TEXT} | sed 's/"/\"/g' | sed "s/'/\'/g")
JSON="{
  \"title\": \"${TITLE}\",
  \"themeColor\": \"${COLOR}\",
  \"text\": \"${MESSAGE}\"
}"

# Post to Microsoft Teams.
curl -H "Content-Type: application/json" -d "${JSON}" "${WEBHOOK_URL}"

Thanks chusiang , is it possible remove the user name from message ?

Hi @wengzy , I think you need the title like "chusiang via Workflows", I can not see some options for it now.

https://adaptivecards.io/designer/

I'm also successfully using your script to post, but my backend monitoring tool has checks against Windows drive pathing. When those checks pass their data to ${TITLE} or ${MESSAGE} it contains a \ in the drive path. This is breaking the JSON with a "Bad JSON escape sequence: \ . Path 'attachments[0].content.body[1].text" error. I've tried a couple of things to correct this issue, but haven't been able to get around it. Any thoughts?

Hi @lp-maximus,

I think we need add Escape Character for \ on L60 in teams-chat-post-for-workflows.sh.

https://gist.github.com/chusiang/895f6406fbf9285c58ad0a3ace13d025#file-teams-chat-post-for-workflows-sh-L60

I have also escape the \ char, maybe it can help you.

- MESSAGE=$(echo ${TEXT} | sed 's/"/\"/g' | sed "s/'/\'/g")
+ MESSAGE=$(echo ${TEXT} | sed "s/'/\'/g" | sed 's/"/\"/g; s/\\/\\\\/g')

Good luck.

Reference:

1. Which characters need to be escaped when using Bash? | Stack Overflow
2. How to use sed to find and replace text in files in Linux / Unix shell - nixCraft