converters.js

function hd4Groups (from, fromName, to, toName, listID) {
    const hd = [["From", [fromName, from]],["To", [toName, to]],["List-ID", [listID]]];
    return JSON.stringify(hd);
}

function hd4Direct (from, fromName, to) {
    const hd = [["From", [fromName, from]],["To", ["",to]]];
    return JSON.stringify(hd);
}

function SenderOrRecipientJSON (rcpID, rcpName) {
    const retval = [[rcpName, rcpID]];
    return JSON.stringify(retval);
}

function bodyBlobJSON (blobID, size, csize, sha512) {
    const retval = [[2, [[blobID, String(size), String(csize), String(sha512)]]]];
    return JSON.stringify(retval);
}

function bodyBlobB64JSON (bodyBase64) {
    const retval = [[2, [String(bodyBase64)]],];
    return JSON.stringify(retval);
}

function filesJSON (fileName, mimeType, blobID, size, csize, sha512, contentID) {
    let retval;
    const ext =  '.' + fileType(mimeType);
    if (fileName === null || fileName === undefined || fileName === "") {
        retval = [["Unnamed Attachment"+ext, mimeType, [blobID, String(size), String(csize), String(sha512)], String(contentID),""]];
    } else {
        retval = [[String(fileName), mimeType, [blobID, String(size), String(csize), String(sha512)], String(contentID),""]];
    }
    return JSON.stringify(retval);
}

function filesB64JSON (fileName, mimeType, data) {
    let retval;
    const ext =  '.' + fileType(mimeType);
    if (fileName === null || fileName === undefined || fileName === "") {
        retval = [["Unnamed Attachment" + ext, String(mimeType), [String(data)], "", ""]];
    }
    else {
        retval = [[String(fileName), String(mimeType), [String(data)], "", ""]];
    }
    return JSON.stringify(retval);
}

function convertToBase64(text) {
    const retval = Buffer.from(text, 'utf8');
    return retval.toString('base64');
}

function insertCharacterAtIndex(text) {
    text = text.substring(0, 9) + '/' + text.substring(9);
    text = text.substring(0, 6) + '/' + text.substring(6);
    text = text.substring(0, 3) + '/' + text.substring(3);
    return text;
}

function createRegex () {
    const characters = 'ABCDEFGHIJKLMNOPQRSTUV0123456789';

    let randomString = '';

    for (let i = 0; i < 16; i++) {
        const randomIndex = Math.floor(Math.random() * characters.length);
        randomString += characters.charAt(randomIndex);
    }
    return randomString;
}

function fileType (str) {
    let retval;
    if (str === 'text/plain') {
        retval = 'txt'
        return retval;
    }

    if (str.includes(';')) {
        retval = str.slice(str.indexOf('/')+1, str.indexOf(';'));
    } else {
        retval = str.slice(str.indexOf('/')+1);
    }
    return retval;
}

module.exports.hd4Groups = hd4Groups;
module.exports.hd4Direct = hd4Direct;
module.exports.SenderOrRecipientJSON = SenderOrRecipientJSON;
module.exports.bodyBlobJSON = bodyBlobJSON;
module.exports.convertToBase64 = convertToBase64;
module.exports.insertCharacterAtIndex = insertCharacterAtIndex;
module.exports.createRegex = createRegex;
module.exports.filesJSON = filesJSON;
module.exports.filesB64JSON = filesB64JSON;
module.exports.bodyBlobB64JSON = bodyBlobB64JSON;