andrewpietiladotcom/lib/FromMimeHeader.js

import MimeHeader from "./MimeHeader.js";

const atext = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!#$%&'*+-/=?^_`{|}~".split('');
const dtext = "!\"#$%^&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ^_`abcdefghijklmnopqrstuvwxyz{|}~".split('');
const qtext = "!#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]^_`abcdefghijklmnopqrstuvwxyz{|}~".split('');

class FromMimeHeader extends MimeHeader {
    constructor(key, value) {
        super(key, value);
        this._fromValue = [];
    }
    // From: Andrew Pietila <a.pietila@protonmail.com>
    get fromValue() {
        // ABNF:
        //    from            =   "From:" mailbox-list CRLF
        //    mailbox-list    =   (mailbox *("," mailbox)) / obs-mbox-list
        //    mailbox         =   name-addr / addr-spec
        //    name-addr       =   [display-name] angle-addr
        //    display-name    =   phrase
        //    phrase          =   1*word / obs-phrase
        //    word            =   atom / quoted-string
        //    atom            =   [CFWS] 1*atext [CFWS]
        //    addr-spec       =   local-part "@" domain
        //    local-part      =   dot-atom / quoted-string / obs-local-part
        //    domain          =   dot-atom / domain-literal / obs-domain
        //    domain-literal  =   [CFWS] "[" *([FWS] dtext) [FWS] "]" [CFWS]
        //    dtext           =   %d33-90 /          ; Printable US-ASCII
        //                        %d94-126 /         ;  characters not including
        //                        obs-dtext          ;  "[", "]", or "\"
        //    dot-atom-text   =   1*atext *("." 1*atext)
        //    dot-atom        =   [CFWS] dot-atom-text [CFWS]
        //    quoted-string   =   [CFWS]
        //                        DQUOTE *([FWS] qcontent) [FWS] DQUOTE
        //                        [CFWS]
        //    qcontent        =   qtext / quoted-pair
        //    qtext           =   %d33 /             ; Printable US-ASCII
        //                        %d35-91 /          ;  characters not including
        //                        %d93-126 /         ;  "\" or the quote character
        //                        obs-qtext
        // TODO: Implement utf-8 encoding and whatever other encodings we have to support.
        if ( this._fromValue.length !== 0 ) {
            return this._fromValue;
        }
        // TODO: Implement this state machine properly according to the above ABNF.
        var from = [];
        var state = "";
        var inCRLF = false;
        var commentDepth = 0;
        var displayName = "";
        var inDquot = false;
        var idLeft = "";
        var idRight = "";
        var idRightDatEmittedRightSquacket = false;
        for (var char of this.rawValue) {
            if ( inCRLF === true && char !== "\n" ) {
                return null; // Error state.
            }
            if (state === "") {
                // CFWS
                if ( char === " ") {
                    continue;
                } else if ( char === "\t") {
                    continue;
                } else if ( char === "(" && !inDquot ) {
                    commentDepth++;
                } else if ( char === "\"" ) {
                    inDquot = !inDquot;
                } else if ( char === ")" && !inDquot ) {
                    commentDepth--;
                } else if ( char === "\r" ) {
                    inCRLF = true;
                } else if ( char === "\n" ) {
                    inCRLF = false;
                } else {
                    state = "display-name";
                }
            } else if ( state === "display-name") {
                if ( char === " " ) {
                    if ( state.endsWith(" ") ) {
                        continue;
                    } else {
                        
                    }
                }
            }
            //     else if ( char === "<" ) {
            //         state = "id-left";
            //     } else {
            //         return null; // Error state, we couldn't produce a proper message ID from the input.
            //     }
            // } else if ( state === "id-left" ) {
            //     if ( atext.includes(char) ) {
            //         idLeft += char;
            //     } else if ( char === "." ) {
            //         if ( idLeft.endsWith(".") || idLeft.length === 0 ) {
            //             return null; // Error state.
            //         }
            //         idLeft += char;
            //     } else if ( char === "@" ) {
            //         if ( idLeft.endsWith(".") || idLeft.length === 0) {
            //             return null; // Error state.
            //         }
            //         state = "id-right";
            //     }
            // } else if ( state === "id-right" ) {
            //     if ( char === "[" ) {
            //         if ( idRight.length !== 0 ) {
            //             return null; // Error state.
            //         }
            //         idRight += char;
            //         state = "id-right-dat";
            //     } else if ( char === "." ) {
            //         if ( idRight.endsWith(".") || idRight.length === 0 ) {
            //             return null; // Error state.
            //         }
            //         idRight += char;
            //     } else if ( char === ">" ) {
            //         if ( idRight.endsWith(".") || idRight.length === 0) {
            //             return null; // Error state.
            //         }
            //         state = "end-cfws"
            //     }
            // } else if ( state === "id-right-dat" ) {
            //     if ( char === ">" && idRight.endsWith("]") ) {
            //         state = "end-cfws";
            //         continue;
            //     }
            //     if ( dtext.includes(char) ) {
            //         if ( idRightDatEmittedRightSquacket ) {
            //             return null; // Error state.
            //         }
            //         idRight += char;
            //     } else if ( char === "]" ) {
            //         if ( idRightDatEmittedRightSquacket ) {
            //             return null; // Error state.
            //         }
            //         idRight += char;
            //         idRightDatEmittedRightSquacket = true;
            //     }
            // } else if ( state === "end-cfws" ) {
            //     // CFWS
            //     if ( char === " ") {
            //         continue;
            //     } else if ( char === "\t") {
            //         continue;
            //     } else if ( char === "(" && !inDquot ) {
            //         commentDepth++;
            //     } else if ( char === "\"" ) {
            //         inDquot = !inDquot;
            //     } else if ( char === ")" && !inDquot ) {
            //         commentDepth--;
            //     } else if ( char === "\r" ) {
            //         inCRLF = true;
            //     } else if ( char === "\n" ) {
            //         inCRLF = false;
            //     } else {
            //         return null; // Error state.
            //     }
            // }
        }

        this._fromValue = from;
        return `${idLeft}@${idRight}`;
    }
}

export default FromMimeHeader;