enigma-bbs/core/message.js

/* jslint node: true */
'use strict';

const msgDb                 = require('./database.js').dbs.message;
const wordWrapText          = require('./word_wrap.js').wordWrapText;
const ftnUtil               = require('./ftn_util.js');
const createNamedUUID       = require('./uuid_util.js').createNamedUUID;
const Errors                = require('./enig_error.js').Errors;
const ANSI                  = require('./ansi_term.js');
const {
    sanitizeString,
    getISOTimestampString } = require('./database.js');

const { isCP437Encodable } = require('./cp437util');
const { containsNonLatinCodepoints } = require('./string_util');

const {
    isAnsi, isFormattedLine,
    splitTextAtTerms,
    renderSubstr
}                           = require('./string_util.js');

const ansiPrep              = require('./ansi_prep.js');

//  deps
const uuidParse             = require('uuid-parse');
const async                 = require('async');
const _                     = require('lodash');
const assert                = require('assert');
const moment                = require('moment');
const iconvEncode           = require('iconv-lite').encode;

const ENIGMA_MESSAGE_UUID_NAMESPACE     = uuidParse.parse('154506df-1df8-46b9-98f8-ebb5815baaf8');

const WELL_KNOWN_AREA_TAGS = {
    Invalid     : '',
    Private     : 'private_mail',
    Bulletin    : 'local_bulletin',
};

const SYSTEM_META_NAMES = {
    LocalToUserID           : 'local_to_user_id',
    LocalFromUserID         : 'local_from_user_id',
    StateFlags0             : 'state_flags0',       //  See Message.StateFlags0
    ExplicitEncoding        : 'explicit_encoding',  //  Explicitly set encoding when exporting/etc.
    ExternalFlavor          : 'external_flavor',    //  "Flavor" of message - imported from or to be exported to. See Message.AddressFlavor
    RemoteToUser            : 'remote_to_user',     //  Opaque value depends on external system, e.g. FTN address
    RemoteFromUser          : 'remote_from_user',   //  Opaque value depends on external system, e.g. FTN address
};

//  Types for Message.SystemMetaNames.ExternalFlavor meta
const ADDRESS_FLAVOR = {
    Local       : 'local',  //  local / non-remote addressing
    FTN         : 'ftn',    //  FTN style
    Email       : 'email',  //  From email
    QWK         : 'qwk',    //  QWK packet
};

const STATE_FLAGS0 = {
    None        : 0x00000000,
    Imported    : 0x00000001,   //  imported from foreign system
    Exported    : 0x00000002,   //  exported to foreign system
};

//  :TODO: these should really live elsewhere...
const FTN_PROPERTY_NAMES = {
    //  packet header oriented
    FtnOrigNode         : 'ftn_orig_node',
    FtnDestNode         : 'ftn_dest_node',
    //  :TODO: rename these to ftn_*_net vs network - ensure things won't break, may need mapping
    FtnOrigNetwork      : 'ftn_orig_network',
    FtnDestNetwork      : 'ftn_dest_network',
    FtnAttrFlags        : 'ftn_attr_flags',
    FtnCost             : 'ftn_cost',
    FtnOrigZone         : 'ftn_orig_zone',
    FtnDestZone         : 'ftn_dest_zone',
    FtnOrigPoint        : 'ftn_orig_point',
    FtnDestPoint        : 'ftn_dest_point',

    //  message header oriented
    FtnMsgOrigNode      : 'ftn_msg_orig_node',
    FtnMsgDestNode      : 'ftn_msg_dest_node',
    FtnMsgOrigNet       : 'ftn_msg_orig_net',
    FtnMsgDestNet       : 'ftn_msg_dest_net',

    FtnAttribute        : 'ftn_attribute',

    FtnTearLine         : 'ftn_tear_line',      //  http://ftsc.org/docs/fts-0004.001
    FtnOrigin           : 'ftn_origin',         //  http://ftsc.org/docs/fts-0004.001
    FtnArea             : 'ftn_area',           //  http://ftsc.org/docs/fts-0004.001
    FtnSeenBy           : 'ftn_seen_by',        //  http://ftsc.org/docs/fts-0004.001
};

const QWKPropertyNames = {
    MessageNumber       : 'qwk_msg_num',
    MessageStatus       : 'qwk_msg_status',         //  See http://wiki.synchro.net/ref:qwk for a decent list
    ConferenceNumber    : 'qwk_conf_num',
    InReplyToNum        : 'qwk_in_reply_to_num',    //  note that we prefer the 'InReplyToMsgId' kludge if available
};

//  :TODO: this is a ugly hack due to bad variable names - clean it up & just _.camelCase(k)!
const MESSAGE_ROW_MAP = {
    reply_to_message_id : 'replyToMsgId',
    modified_timestamp  : 'modTimestamp'
};

module.exports = class Message {
    constructor(
        {
            messageId = 0,
            areaTag = Message.WellKnownAreaTags.Invalid,
            uuid,
            replyToMsgId = 0,
            toUserName = '',
            fromUserName = '',
            subject = '',
            message = '',
            modTimestamp = moment(),
            meta,
            hashTags = [],
        } = { }
    )
    {
        this.messageId      = messageId;
        this.areaTag        = areaTag;
        this.messageUuid    = uuid;
        this.replyToMsgId   = replyToMsgId;
        this.toUserName     = toUserName;
        this.fromUserName   = fromUserName;
        this.subject        = subject;
        this.message        = message;

        if(_.isDate(modTimestamp) || _.isString(modTimestamp)) {
            modTimestamp = moment(modTimestamp);
        }

        this.modTimestamp = modTimestamp || moment();

        this.meta = {};
        _.defaultsDeep(this.meta, { System : {} }, meta);

        this.hashTags       = hashTags;
    }

    get uuid() {    //  deprecated, will be removed in the near future
        return this.messageUuid;
    }

    isValid() { return true; }  //  :TODO: obviously useless; look into this or remove it

    static isPrivateAreaTag(areaTag) {
        return areaTag.toLowerCase() === Message.WellKnownAreaTags.Private;
    }

    isPrivate() {
        return Message.isPrivateAreaTag(this.areaTag);
    }

    isFromRemoteUser() {
        return null !== _.get(this, 'meta.System.remote_from_user', null);
    }

    isCP437Encodable() {
        return isCP437Encodable(this.toUserName) &&
            isCP437Encodable(this.fromUserName) &&
            isCP437Encodable(this.subject) &&
            isCP437Encodable(this.message);
    }

    containsNonLatinCodepoints() {
        return containsNonLatinCodepoints(this.toUserName) ||
            containsNonLatinCodepoints(this.fromUserName) ||
            containsNonLatinCodepoints(this.subject) ||
            containsNonLatinCodepoints(this.message);
    }

    /*
    :TODO: finish me
    static checkUserHasDeleteRights(user, messageIdOrUuid, cb) {
        const isMessageId = _.isNumber(messageIdOrUuid);
        const getMetaName = isMessageId ? 'getMetaValuesByMessageId' : 'getMetaValuesByMessageUuid';

        Message[getMetaName](messageIdOrUuid, 'System', Message.SystemMetaNames.LocalToUserID, (err, localUserId) => {
            if(err) {
                return cb(err);
            }

            //  expect single value
            if(!_.isString(localUserId)) {
                return cb(Errors.Invalid(`Invalid ${Message.SystemMetaNames.LocalToUserID} value: ${localUserId}`));
            }

            localUserId = parseInt(localUserId);
        });
    }
    */

    userHasDeleteRights(user) {
        const messageLocalUserId = parseInt(this.meta.System[Message.SystemMetaNames.LocalToUserID]);
        return (this.isPrivate() && user.userId === messageLocalUserId) || user.isSysOp();
    }

    static get WellKnownAreaTags() {
        return WELL_KNOWN_AREA_TAGS;
    }

    static get SystemMetaNames() {
        return SYSTEM_META_NAMES;
    }

    static get AddressFlavor() {
        return ADDRESS_FLAVOR;
    }

    static get StateFlags0() {
        return STATE_FLAGS0;
    }

    static get FtnPropertyNames() {
        return FTN_PROPERTY_NAMES;
    }

    static get QWKPropertyNames() {
        return QWKPropertyNames;
    }

    setLocalToUserId(userId) {
        this.meta.System = this.meta.System || {};
        this.meta.System[Message.SystemMetaNames.LocalToUserID] = userId;
    }

    setLocalFromUserId(userId) {
        this.meta.System = this.meta.System || {};
        this.meta.System[Message.SystemMetaNames.LocalFromUserID] = userId;
    }

    setRemoteToUser(remoteTo) {
        this.meta.System = this.meta.System || {};
        this.meta.System[Message.SystemMetaNames.RemoteToUser] = remoteTo;
    }

    setExternalFlavor(flavor) {
        this.meta.System = this.meta.System || {};
        this.meta.System[Message.SystemMetaNames.ExternalFlavor] = flavor;
    }

    static createMessageUUID(areaTag, modTimestamp, subject, body) {
        assert(_.isString(areaTag));
        assert(_.isDate(modTimestamp) || moment.isMoment(modTimestamp));
        assert(_.isString(subject));
        assert(_.isString(body));

        if(!moment.isMoment(modTimestamp)) {
            modTimestamp = moment(modTimestamp);
        }

        areaTag         = iconvEncode(areaTag.toUpperCase(), 'CP437');
        modTimestamp    = iconvEncode(modTimestamp.format('DD MMM YY  HH:mm:ss'), 'CP437');
        subject         = iconvEncode(subject.toUpperCase().trim(), 'CP437');
        body            = iconvEncode(body.replace(/\r\n|[\n\v\f\r\x85\u2028\u2029]/g, '').trim(), 'CP437');

        return uuidParse.unparse(createNamedUUID(ENIGMA_MESSAGE_UUID_NAMESPACE, Buffer.concat( [ areaTag, modTimestamp, subject, body ] )));
    }

    static getMessageFromRow(row) {
        const msg = {};
        _.each(row, (v, k) => {
            //  :TODO: see notes around MESSAGE_ROW_MAP -- clean this up so we can just _camelCase()!
            k = MESSAGE_ROW_MAP[k] || _.camelCase(k);
            msg[k] = v;
        });
        return msg;
    }

    /*
        Find message IDs or UUIDs by filter. Available filters/options:

        filter.uuids - use with resultType='id'
        filter.ids - use with resultType='uuid'
        filter.toUserName - string|Array(string)
        filter.fromUserName - string|Array(string)
        filter.replyToMessageId

        filter.operator = (AND)|OR

        filter.newerThanTimestamp - may not be used with |date|
        filter.date - moment object - may not be used with |newerThanTimestamp|

        filter.newerThanMessageId
        filter.areaTag - note if you want by conf, send in all areas for a conf
        filter.metaTuples - [ {category, name, value} ]

        filter.terms - FTS search

        filter.sort = modTimestamp | messageId
        filter.order = ascending | (descending)

        filter.limit
        filter.resultType = (id) | uuid | count | messageList
        filter.extraFields = []

        filter.privateTagUserId = <userId> - if set, only private messages belonging to <userId> are processed
        - areaTags filter ignored
        - if NOT present, private areas are skipped

        *=NYI
    */
    static findMessages(filter, cb) {
        filter = filter || {};

        filter.resultType   = filter.resultType || 'id';
        filter.extraFields  = filter.extraFields || [];
        filter.operator     = filter.operator || 'AND';

        if('messageList' === filter.resultType) {
            filter.extraFields = _.uniq(filter.extraFields.concat(
                [ 'area_tag', 'message_uuid', 'reply_to_message_id', 'to_user_name', 'from_user_name', 'subject', 'modified_timestamp' ]
            ));
        }

        const field = 'uuid' === filter.resultType ? 'message_uuid' : 'message_id';

        if(moment.isMoment(filter.newerThanTimestamp)) {
            filter.newerThanTimestamp = getISOTimestampString(filter.newerThanTimestamp);
        }

        let sql;
        if('count' === filter.resultType) {
            sql =
                `SELECT COUNT() AS count
                FROM message m`;

        } else {
            sql =
                `SELECT DISTINCT m.${field}${filter.extraFields.length > 0 ? ', ' + filter.extraFields.map(f => `m.${f}`).join(', ') : ''}
                FROM message m`;
        }

        const sqlOrderDir = 'ascending' === filter.order ? 'ASC' : 'DESC';
        let sqlOrderBy;
        let sqlWhere = '';

        function appendWhereClause(clause, op) {
            if(sqlWhere) {
                sqlWhere += ` ${op || filter.operator} `;
            } else {
                sqlWhere += ' WHERE ';
            }
            sqlWhere += clause;
        }

        //  currently only avail sort
        if('modTimestamp' === filter.sort) {
            sqlOrderBy = `ORDER BY m.modified_timestamp ${sqlOrderDir}`;
        } else {
            sqlOrderBy = `ORDER BY m.message_id ${sqlOrderDir}`;
        }

        if(Array.isArray(filter.ids)) {
            appendWhereClause(`m.message_id IN (${filter.ids.join(', ')})`);
        }

        if(Array.isArray(filter.uuids)) {
            const uuidList = filter.uuids.map(u => `"${u}"`).join(', ');
            appendWhereClause(`m.message_id IN (${uuidList})`);
        }


        if(_.isNumber(filter.privateTagUserId)) {
            appendWhereClause(`m.area_tag = "${Message.WellKnownAreaTags.Private}"`);
            appendWhereClause(
                `m.message_id IN (
                    SELECT message_id
                    FROM message_meta
                    WHERE meta_category = "System" AND meta_name = "${Message.SystemMetaNames.LocalToUserID}" AND meta_value = ${filter.privateTagUserId}
                )`);
        } else {
            if(filter.areaTag && filter.areaTag.length > 0) {
                if (!Array.isArray(filter.areaTag)) {
                    filter.areaTag = [ filter.areaTag ];
                }

                const areaList = filter.areaTag
                    .filter(t => t !== Message.WellKnownAreaTags.Private)
                    .map(t => `"${t}"`).join(', ');
                if(areaList.length > 0) {
                    appendWhereClause(`m.area_tag IN(${areaList})`);
                } else {
                    //  nothing to do; no areas remain
                    return cb(null, []);
                }
            } else {
                //  explicit exclude of Private
                appendWhereClause(`m.area_tag != "${Message.WellKnownAreaTags.Private}"`, 'AND');
            }
        }

        if(_.isNumber(filter.replyToMessageId)) {
            appendWhereClause(`m.reply_to_message_id=${filter.replyToMessageId}`);
        }

        [ 'toUserName', 'fromUserName' ].forEach(field => {
            let val = filter[field];
            if(!val) {
                return; //  next item
            }
            if(_.isString(val)) {
                val = [ val ];
            }
            if(Array.isArray(val)) {
                val = '(' + val.map(v => {
                    return `m.${_.snakeCase(field)} LIKE "${sanitizeString(v)}"`;
                }).join(' OR ') + ')';
                appendWhereClause(val);
            }
        });

        if(_.isString(filter.newerThanTimestamp) && filter.newerThanTimestamp.length > 0) {
            //  :TODO: should be using "localtime" here?
            appendWhereClause(`DATETIME(m.modified_timestamp) > DATETIME("${filter.newerThanTimestamp}", "+1 seconds")`);
        } else if(moment.isMoment(filter.date)) {
            appendWhereClause(`DATE(m.modified_timestamp, "localtime") = DATE("${filter.date.format('YYYY-MM-DD')}")`);
        }

        if(_.isNumber(filter.newerThanMessageId)) {
            appendWhereClause(`m.message_id > ${filter.newerThanMessageId}`);
        }

        if(filter.terms && filter.terms.length > 0) {
            //  note the ':' in MATCH expr., see https://www.sqlite.org/cvstrac/wiki?p=FullTextIndex
            appendWhereClause(
                `m.message_id IN (
                    SELECT rowid
                    FROM message_fts
                    WHERE message_fts MATCH ":${sanitizeString(filter.terms)}"
                )`
            );
        }

        if(Array.isArray(filter.metaTuples)) {
            let sub = [];
            filter.metaTuples.forEach(mt => {
                sub.push(`(meta_category = "${mt.category}" AND meta_name = "${mt.name}" AND meta_value = "${sanitizeString(mt.value)}")`);
            });
            sub = sub.join(` ${filter.operator} `);
            appendWhereClause(
                `m.message_id IN (
                    SELECT message_id
                    FROM message_meta
                    WHERE ${sub}
                )`
            );
        }

        sql += `${sqlWhere} ${sqlOrderBy}`;

        if(_.isNumber(filter.limit)) {
            sql += ` LIMIT ${filter.limit}`;
        }

        sql += ';';

        if('count' === filter.resultType) {
            msgDb.get(sql, (err, row) => {
                return cb(err, row ? row.count : 0);
            });
        } else {
            const matches = [];
            const extra = filter.extraFields.length > 0;

            const rowConv = 'messageList' === filter.resultType ? Message.getMessageFromRow : row => row;

            msgDb.each(sql, (err, row) => {
                if(_.isObject(row)) {
                    matches.push(extra ? rowConv(row) : row[field]);
                }
            }, err => {
                return cb(err, matches);
            });
        }
    }

    //  :TODO: use findMessages, by uuid, limit=1
    static getMessageIdByUuid(uuid, cb) {
        msgDb.get(
            `SELECT message_id
            FROM message
            WHERE message_uuid = ?
            LIMIT 1;`,
            [ uuid ],
            (err, row) => {
                if(err) {
                    return cb(err);
                }

                const success = (row && row.message_id);
                return cb(
                    success ? null : Errors.DoesNotExist(`No message for UUID ${uuid}`),
                    success ? row.message_id : null
                );
            }
        );
    }

    //  :TODO: use findMessages
    static getMessageIdsByMetaValue(category, name, value, cb) {
        msgDb.all(
            `SELECT message_id
            FROM message_meta
            WHERE meta_category = ? AND meta_name = ? AND meta_value = ?;`,
            [ category, name, value ],
            (err, rows) => {
                if(err) {
                    return cb(err);
                }
                return cb(null, rows.map(r => parseInt(r.message_id))); //  return array of ID(s)
            }
        );
    }

    static getMetaValuesByMessageId(messageId, category, name, cb) {
        const sql =
            `SELECT meta_value
            FROM message_meta
            WHERE message_id = ? AND meta_category = ? AND meta_name = ?;`;

        msgDb.all(sql, [ messageId, category, name ], (err, rows) => {
            if(err) {
                return cb(err);
            }

            if(0 === rows.length) {
                return cb(Errors.DoesNotExist('No value for category/name'));
            }

            //  single values are returned without an array
            if(1 === rows.length) {
                return cb(null, rows[0].meta_value);
            }

            return cb(null, rows.map(r => r.meta_value));   //  map to array of values only
        });
    }

    static getMetaValuesByMessageUuid(uuid, category, name, cb) {
        async.waterfall(
            [
                function getMessageId(callback) {
                    Message.getMessageIdByUuid(uuid, (err, messageId) => {
                        return callback(err, messageId);
                    });
                },
                function getMetaValues(messageId, callback) {
                    Message.getMetaValuesByMessageId(messageId, category, name, (err, values) => {
                        return callback(err, values);
                    });
                }
            ],
            (err, values) => {
                return cb(err, values);
            }
        );
    }

    loadMeta(cb) {
        /*
            Example of loaded this.meta:

            meta: {
                System: {
                    local_to_user_id: 1234,
                },
                FtnProperty: {
                    ftn_seen_by: [ "1/102 103", "2/42 52 65" ]
                }
            }
        */
        const sql =
            `SELECT meta_category, meta_name, meta_value
            FROM message_meta
            WHERE message_id = ?;`;

        const self = this;  //  :TODO: not required - arrow functions below:
        msgDb.each(sql, [ this.messageId ], (err, row) => {
            if(!(row.meta_category in self.meta)) {
                self.meta[row.meta_category] = { };
                self.meta[row.meta_category][row.meta_name] = row.meta_value;
            } else {
                if(!(row.meta_name in self.meta[row.meta_category])) {
                    self.meta[row.meta_category][row.meta_name] = row.meta_value;
                } else {
                    if(_.isString(self.meta[row.meta_category][row.meta_name])) {
                        self.meta[row.meta_category][row.meta_name] = [ self.meta[row.meta_category][row.meta_name] ];
                    }

                    self.meta[row.meta_category][row.meta_name].push(row.meta_value);
                }
            }
        }, err => {
            return cb(err);
        });
    }

    load(loadWith, cb) {
        assert(_.isString(loadWith.uuid) || _.isNumber(loadWith.messageId));

        const self = this;

        async.series(
            [
                function loadMessage(callback) {
                    const whereField = loadWith.uuid ? 'message_uuid' : 'message_id';
                    msgDb.get(
                        `SELECT message_id, area_tag, message_uuid, reply_to_message_id, to_user_name, from_user_name, subject,
                        message, modified_timestamp, view_count
                        FROM message
                        WHERE ${whereField} = ?
                        LIMIT 1;`,
                        [ loadWith.uuid || loadWith.messageId ],
                        (err, msgRow) => {
                            if(err) {
                                return callback(err);
                            }

                            if(!msgRow) {
                                return callback(Errors.DoesNotExist('Message (no longer) available'));
                            }

                            self.messageId      = msgRow.message_id;
                            self.areaTag        = msgRow.area_tag;
                            self.messageUuid    = msgRow.message_uuid;
                            self.replyToMsgId   = msgRow.reply_to_message_id;
                            self.toUserName     = msgRow.to_user_name;
                            self.fromUserName   = msgRow.from_user_name;
                            self.subject        = msgRow.subject;
                            self.message        = msgRow.message;

                            //  We use parseZone() to *preserve* the time zone information
                            self.modTimestamp   = moment.parseZone(msgRow.modified_timestamp);

                            return callback(err);
                        }
                    );
                },
                function loadMessageMeta(callback) {
                    self.loadMeta(err => {
                        return callback(err);
                    });
                },
                function loadHashTags(callback) {
                    //  :TODO:
                    return callback(null);
                }
            ],
            err => {
                return cb(err);
            }
        );
    }

    persistMetaValue(category, name, value, transOrDb, cb) {
        if(!_.isFunction(cb) && _.isFunction(transOrDb)) {
            cb = transOrDb;
            transOrDb = msgDb;
        }

        const metaStmt = transOrDb.prepare(
            `INSERT INTO message_meta (message_id, meta_category, meta_name, meta_value)
            VALUES (?, ?, ?, ?);`);

        if(!_.isArray(value)) {
            value = [ value ];
        }

        const self = this;

        async.each(value, (v, next) => {
            metaStmt.run(self.messageId, category, name, v, err => {
                return next(err);
            });
        }, err => {
            return cb(err);
        });
    }

    persist(cb) {
        if(!this.isValid()) {
            return cb(Errors.Invalid('Cannot persist invalid message!'));
        }

        const self = this;

        async.waterfall(
            [
                function beginTransaction(callback) {
                    return msgDb.beginTransaction(callback);
                },
                function storeMessage(trans, callback) {
                    //  generate a UUID for this message if required (general case)
                    if(!self.messageUuid) {
                        self.messageUuid = Message.createMessageUUID(
                            self.areaTag,
                            self.modTimestamp,
                            self.subject,
                            self.message
                        );
                    }

                    trans.run(
                        `INSERT INTO message (area_tag, message_uuid, reply_to_message_id, to_user_name, from_user_name, subject, message, modified_timestamp)
                        VALUES (?, ?, ?, ?, ?, ?, ?, ?);`,
                        [
                            self.areaTag, self.messageUuid, self.replyToMsgId, self.toUserName,
                            self.fromUserName, self.subject, self.message, getISOTimestampString(self.modTimestamp)
                        ],
                        function inserted(err) {    //  use non-arrow function for 'this' scope
                            if(!err) {
                                self.messageId = this.lastID;
                            }

                            return callback(err, trans);
                        }
                    );
                },
                function storeMeta(trans, callback) {
                    if(!self.meta) {
                        return callback(null, trans);
                    }
                    /*
                        Example of self.meta:

                        meta: {
                            System: {
                                local_to_user_id: 1234,
                            },
                            FtnProperty: {
                                ftn_seen_by: [ "1/102 103", "2/42 52 65" ]
                            }
                        }
                    */
                    async.each(Object.keys(self.meta), (category, nextCat) => {
                        async.each(Object.keys(self.meta[category]), (name, nextName) => {
                            self.persistMetaValue(category, name, self.meta[category][name], trans, err => {
                                return nextName(err);
                            });
                        }, err => {
                            return nextCat(err);
                        });

                    }, err => {
                        return callback(err, trans);
                    });
                },
                function storeHashTags(trans, callback) {
                    //  :TODO: hash tag support
                    return callback(null, trans);
                }
            ],
            (err, trans) => {
                if(trans) {
                    trans[err ? 'rollback' : 'commit'](transErr => {
                        return cb(err ? err : transErr, self.messageId);
                    });
                } else {
                    return cb(err);
                }
            }
        );
    }

    deleteMessage(requestingUser, cb) {
        if(!this.userHasDeleteRights(requestingUser)) {
            return cb(Errors.AccessDenied('User does not have rights to delete this message'));
        }

        msgDb.run(
            `DELETE FROM message
            WHERE message_uuid = ?;`,
            [ this.messageUuid ],
            err => {
                return cb(err);
            }
        );
    }

    //  :TODO: FTN stuff doesn't have any business here
    getFTNQuotePrefix(source) {
        source = source || 'fromUserName';

        return ftnUtil.getQuotePrefix(this[source]);
    }

    getTearLinePosition(input) {
        const m = input.match(/^--- .+$(?![\s\S]*^--- .+$)/m);
        return m ? m.index : -1;
    }

    getQuoteLines(options, cb) {
        if(!options.termWidth || !options.termHeight || !options.cols) {
            return cb(Errors.MissingParam());
        }

        options.startCol            = options.startCol || 1;
        options.includePrefix       = _.get(options, 'includePrefix', true);
        options.ansiResetSgr        = options.ansiResetSgr || ANSI.getSGRFromGraphicRendition( { fg : 39, bg : 49 }, true);
        options.ansiFocusPrefixSgr  = options.ansiFocusPrefixSgr || ANSI.getSGRFromGraphicRendition( { intensity : 'bold', fg : 39, bg : 49 } );
        options.isAnsi              = options.isAnsi || isAnsi(this.message);   //  :TODO: If this.isAnsi, use that setting

        /*
            Some long text that needs to be wrapped and quoted should look right after
            doing so, don't ya think? yeah I think so

            Nu> Some long text that needs to be wrapped and quoted should look right
            Nu> after doing so, don't ya think? yeah I think so

            Ot> Nu> Some long text that needs to be wrapped and quoted should look
            Ot> Nu> right after doing so, don't ya think? yeah I think so

        */
        const quotePrefix = options.includePrefix ? this.getFTNQuotePrefix(options.prefixSource || 'fromUserName') : '';

        function getWrapped(text, extraPrefix) {
            extraPrefix = extraPrefix ? ` ${extraPrefix}` : '';

            const wrapOpts = {
                width       : options.cols - (quotePrefix.length + extraPrefix.length),
                tabHandling : 'expand',
                tabWidth    : 4,
            };

            return wordWrapText(text, wrapOpts).wrapped.map( (w, i) => {
                return i === 0 ? `${quotePrefix}${w}` : `${quotePrefix}${extraPrefix}${w}`;
            });
        }

        function getFormattedLine(line) {
            //  for pre-formatted text, we just append a line truncated to fit
            let newLen;
            const total = line.length + quotePrefix.length;

            if(total > options.cols) {
                newLen = options.cols - total;
            } else {
                newLen = total;
            }

            return `${quotePrefix}${line.slice(0, newLen)}`;
        }

        if(options.isAnsi) {
            ansiPrep(
                this.message.replace(/\r?\n/g, '\r\n'), //  normalized LF -> CRLF
                {
                    termWidth       : options.termWidth,
                    termHeight      : options.termHeight,
                    cols            : options.cols,
                    rows            : 'auto',
                    startCol        : options.startCol,
                    forceLineTerm   : true,
                },
                (err, prepped) => {
                    prepped = prepped || this.message;

                    let lastSgr = '';
                    const split = splitTextAtTerms(prepped);

                    const quoteLines        = [];
                    const focusQuoteLines   = [];

                    //
                    //  Do not include quote prefixes (e.g. XX> ) on ANSI replies (and therefor quote builder)
                    //  as while this works in ENiGMA, other boards such as Mystic, WWIV, etc. will try to
                    //  strip colors, colorize the lines, etc. If we exclude the prefixes, this seems to do
                    //  the trick and allow them to leave them alone!
                    //
                    split.forEach(l => {
                        quoteLines.push(`${lastSgr}${l}`);

                        focusQuoteLines.push(`${options.ansiFocusPrefixSgr}>${lastSgr}${renderSubstr(l, 1, l.length - 1)}`);
                        lastSgr = (l.match(/(?:\x1b\x5b)[?=;0-9]*m(?!.*(?:\x1b\x5b)[?=;0-9]*m)/) || [])[0] || '';   //  eslint-disable-line no-control-regex
                    });

                    quoteLines[quoteLines.length - 1] += options.ansiResetSgr;

                    return cb(null, quoteLines, focusQuoteLines, true);
                }
            );
        } else {
            const QUOTE_RE  = /^ ((?:[A-Za-z0-9]{2}> )+(?:[A-Za-z0-9]{2}>)*) */;
            const quoted    = [];
            const input     = _.trimEnd(this.message).replace(/\x08/g, ''); //  eslint-disable-line no-control-regex

            //  find *last* tearline
            let tearLinePos = this.getTearLinePosition(input);
            tearLinePos = -1 === tearLinePos ? input.length : tearLinePos;  //  we just want the index or the entire string

            input.slice(0, tearLinePos).split(/\r\n\r\n|\n\n/).forEach(paragraph => {
                //
                //  For each paragraph, a state machine:
                //  - New line - line
                //  - New (pre)quoted line - quote_line
                //  - Continuation of new/quoted line
                //
                //  Also:
                //  - Detect pre-formatted lines & try to keep them as-is
                //
                let state;
                let buf = '';
                let quoteMatch;

                if(quoted.length > 0) {
                    //
                    //  Preserve paragraph seperation.
                    //
                    //  FSC-0032 states something about leaving blank lines fully blank
                    //  (without a prefix) but it seems nicer (and more consistent with other systems)
                    //  to put 'em in.
                    //
                    quoted.push(quotePrefix);
                }

                paragraph.split(/\r?\n/).forEach(line => {
                    if(0 === line.trim().length) {
                        //  see blank line notes above
                        return quoted.push(quotePrefix);
                    }

                    quoteMatch = line.match(QUOTE_RE);

                    switch(state) {
                        case 'line' :
                            if(quoteMatch) {
                                if(isFormattedLine(line)) {
                                    quoted.push(getFormattedLine(line.replace(/\s/, '')));
                                } else {
                                    quoted.push(...getWrapped(buf, quoteMatch[1]));
                                    state = 'quote_line';
                                    buf = line;
                                }
                            } else {
                                buf += ` ${line}`;
                            }
                            break;

                        case 'quote_line' :
                            if(quoteMatch) {
                                const rem = line.slice(quoteMatch[0].length);
                                if(!buf.startsWith(quoteMatch[0])) {
                                    quoted.push(...getWrapped(buf, quoteMatch[1]));
                                    buf = rem;
                                } else {
                                    buf += ` ${rem}`;
                                }
                            } else {
                                quoted.push(...getWrapped(buf));
                                buf = line;
                                state = 'line';
                            }
                            break;

                        default :
                            if(isFormattedLine(line)) {
                                quoted.push(getFormattedLine(line));
                            } else {
                                state   = quoteMatch ? 'quote_line' : 'line';
                                buf     = 'line' === state ? line : line.replace(/\s/, ''); //  trim *first* leading space, if any
                            }
                            break;
                    }
                });

                quoted.push(...getWrapped(buf, quoteMatch ? quoteMatch[1] : null));
            });

            input.slice(tearLinePos).split(/\r?\n/).forEach(l => {
                quoted.push(...getWrapped(l));
            });

            return cb(null, quoted, null, false);
        }
    }
};