Helper Node: Add Message to HTML Body of Email

Adding an HTML Message to msg.html

There are scenarios when sending email out of a flow where it would be advantageous to include additional content into the HTML of an existing email. For example, imagine a case where a user reports a potential phishing email which turns out to not be a phishing attempt. In this scenario, the flow should be able to send back the reported email with a prefix indicating the message appears to be safe.

The following function node, which can be imported into your flow by copying the text and importing from the clipboard, adds a prefix to an email message with informational text. To use the node, the flow message must already have the msg.html property.


[
    {
        "id": "cd67692d.acc258",
        "type": "function",
        "z": "2c0c3b83.4ee754",
        "name": "Insert HTML prefix into msg.html",
        "func": "let information = '<b>This is my message prefix</b>' +\n    '<p>More data here</p>';\n\n\n// Inserts the information string into the msg.html\n// field.  Will perform the insert on the first\n// matching rule.\n// 1. Insert after the opening body tag.\n// 2. Insert after the closing head tag.\n// 3. Insert after the opening html tag.\n// 4. Insert at the begining of the msg.html string.\n// If there is no msg.html property, nothing is done.\nlet html = msg.html;\n\n// Find the body and insert the message.\nif ( html )\n{\n    // Try inserting after the opening body tag.\n    let pattern = /(<body[^>]*>)/img;\n    let matches = pattern.exec(html);\n    if ( matches && pattern.lastIndex > 0 )\n    {\n        msg.html = html.slice( 0, pattern.lastIndex ) + information + html.slice( pattern.lastIndex );\n        return msg;\n    }\n    // Try inserting after the closing head tag.\n    pattern = /(<\\/head>)/img;\n    matches = pattern.exec(html);\n    if ( matches && pattern.lastIndex > 0 )\n    {\n        msg.html = html.slice( 0, pattern.lastIndex ) + information + html.slice( pattern.lastIndex );\n        return msg;\n    }\n    // Try inserting after the opening html tag.\n    pattern = /(<html[^>]*>)/img;\n    matches = pattern.exec(html);\n    if ( matches && pattern.lastIndex > 0 )\n    {\n        msg.html = html.slice( 0, pattern.lastIndex ) + information + html.slice( pattern.lastIndex );\n        return msg;\n    }\n    // Last resort, just prefix into the message.\n    msg.html = information + html;\n}\nreturn msg;\n",
        "outputs": 1,
        "noerr": 0,
        "x": 580,
        "y": 380,
        "wires": []
    }
]

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