Dreamwidth signal boost bookmarklet that works on most pages, with username processing for additional sites

signal_boost.js

var postURL = "https://www.dreamwidth.org/update.bml?event=";
var curURL = window.location.href;

// get the currently selected text (no longer used in boost)
function getSelectionText() {
    var text = "";
    if (window.getSelection) {
        text = window.getSelection().toString();
    } else if (document.selection && document.selection.type != "Control") {
        text = document.selection.createRange().text;
    }
    return text;
}

// updated, get currently selected html
function getSelectionHtml() {
    var html = "";
    if (typeof window.getSelection != "undefined") {
        var sel = window.getSelection();
        if (sel.rangeCount) {
            var container = document.createElement("div");
            for (var i = 0, len = sel.rangeCount; i < len; ++i) {
                container.appendChild(sel.getRangeAt(i).cloneContents());
            }
            html = container.innerHTML;
        }
    } else if (typeof document.selection != "undefined") {
        if (document.selection.type == "Text") {
            html = document.selection.createRange().htmlText;
        }
    }
    return html;
}

// check if it's locked. this checks for a different element now because the previous one inexplicably failed weirdly for a few people. ¯\_(ツ)_/¯
function isLocked() {
    return document.getElementsByClassName("security-protected").length > 0;
}

function confirmBoost() {
    var doPost = !isLocked();
    if (!doPost) {
        doPost = confirm("Post is access-locked. Continue?");
    }
    return doPost;
}

function userLink(tag,attr,attrV,match,usrS) {
    if(match=='exact'){var y='=';}
    else if(match=='start'){var y='^=';}
    else{var y='^=';}
    try {
        var a=document.querySelector(tag+'['+attr+y+'"'+attrV+'"]').getAttribute('href');
    } catch(err) {return [];} //try returning blank array instead?
    if(!Boolean(usrS)){usrS=0;}
    return a.substr(usrS).split('/');
}

function cleanUp(s,c,p){ //until() function incorporated
    if(Boolean(c) && s.includes(c)) {
        if(p=='until') {return s.substr(0,s.indexOf(c));}
        else{return s.substr(c.length);}
    }
    else {
        return s;
    }
}

function getUserName(sD,sN,fU,sFU,sSFU) {
    //text by page type
    var accT="'s account";
    var arcT="'s archive";
    var bloT="'s blog";
    var commT="'s recent comments";
    var evnT="'s events";
    var favT="'s favorites";
    var folgT="'s following page";
    var folrT="'s followers page";
    var frndT="'s friends page";
    var galT="'s gallery";
    var jourT="'s journal";
    var libT="'s library";
    var lovT="'s loved tracks";
    var memT="'s memories";
    var neiT="'s neighbors";
    var neT="'s network";
    var posT=" posted"; // or this could be just the default
    var prnT="'s prints";
    var proT="'s profile";
    var rdT="'s reading page";
    var rprT="'s report";
    var shT="'s shouts";
    var tagT="'s tags";
    
    // sites known to DW for the user tag
    var ao3={sn:'archiveofourown.com',usrF:['users'],posF:['works'],usr:sFU,usrS:1,usrL:1,tag:'a',attr:'rel',match:'exact',attrV:'author'};
    var blo={sn:'blogspot.com',usrF:'.',usr:sD};
    var dj={sn:'deadjournal.com',usrF:'.',usr:sD};
    var dw={sn:'dreamwidth.org',usrF:'.',usr:sD,ty:[['profile',proT],['read',rdT],['comments',commT],['archive',arcT],['network',neT],['tag',tagT]]};
    var da={sn:'deviantart.com',usrF:'/',usr:fU,ty:[['gallery',galT],['prints',prnT],['favourites',favT],['journal',jourT]],noUsr:['join']};
    var etsy={sn:'etsy.com',usrF:['shop'],posF:['listing'],usr:sFU,usrS:8,usrL:2,tag:'link',attr:'href',match:'start',attrV:'https://www.etsy.com/shop/',clean:'?',clPos:'until'};
    var fb={sn:'facebook.com',usrF:'/',usr:fU}
    var ffn={sn:'fanfiction.net',usrF:['u'],posF:['s'],usr:sSFU,usrS:1,usrL:2,tag:'a',attr:'href',match:'start',attrV:'/u/'};
    var ij={sn:'insanejournal.com',usrF:'.',usr:sD};
    var ig={sn:'instagram.com',usrF:'/',usr:fU,usrS:8,usrL:1,tag:'link',attr:'rel',match:'exact',attrV:'canonical'};
    var jf={sn:'journalfen.com',usrF:['users'],usr:sFU,ty:[['profile',proT],['read',rdT],['archive',arcT],['tag',tagT]]};
    var lf={sn:'last.fm',usrF:['user'],usr:sFU,ty:[['listening-report',rprT],['library',libT],['following',folgT],['followers',folrT],['loved',lovT],['events',evnT],['neighbours',neiT],['tags',tagT],['shoutbox',shT]]};
    var lj={sn:'livejournal.com',usrF:'.',usr:sD,ty:[['profile',proT],['friends',frndT],['calendar',arcT],['memories',memT]]};
    var lro={sn:'rossia.org',usrF:['users','community'],usr:sFU,ty:[['friends',frndT],['calendar',arcT],['tag',tagT]]};
    var med={sn:'medium.com',usrF:'/',usr:fU,usrS:8,usrL:1,tag:'link',attr:'rel',match:'exact',attrV:'author',clean:'@',clPos:'start'};
    var pin={sn:'pinboard.in',usrF:'/',usr:fU,clean:'u:',clPos:'start'};
    var plrk={sn:'plurk.com',usrF:'/',usr:fU};
    var rav={sn:'ravelry.com',usrF:['designers'],posF:['patterns'],usr:sFU,usrS:8,usrL:2,tag:'a',attr:'href',match:'start',attrV:'https://www.ravelry.com/designers/'};
    var tum={sn:'tumblr.com',usrF:'.',usr:sD};
    var wp={sn:'wordpress.com',usrF:'.',usr:sD};
    var yt={sn:'youtube.com',usrF:['user'],usr:sFU};
    var s=[ao3,blo,dj,dw,da,etsy,fb,ffn,lj,ig,jf,lf,lj,lro,med,pin,plrk,rav,tum,wp,yt];
    
    var i=0;
    while(i<s.length){
        if(sN==s[i].sn) {
            var c=s[i];
            break;
        }
        i++;
    }
    //debug
    alert(c.sn);
    if(!Boolean(c)){return;} // no match
    if(c.usrF=='.'){ // subdomain username site
        if(!Boolean(sD)||sD=='www'){return;}// no username
        else{
            var r=[sD];
            if(!Boolean(fU)) {// root folder
                r.push(bloT); // push blog text onto array
                return r;
            } 
            if(Boolean(c.ty)) {
                var i=0;
                while(i<c.ty.length) {
                    if(c.ty[0]==fU) {
                        r.push(c.ty[1]); // add the corresponding text onto array
                        return r;
                    }
                    i++;
                }
            }            
            r.push(posT); //if no page type, make it a post
            return r;
        }
    } else if(c.usrF=='/'){ //folder username
        if(!Boolean(fU)){return;} //no username
        if(Boolean(c.noUsr)) {
            i=0;
            while(i<c.noUsr){
                if(fU==c.noUser[i]){return;} //no username
                i++;
            }
        }
        if(c.sn=="medium.com" && fU.includes('@')){
            var r=[cleanUp(fU,c.clean,c.clPos)];
        }
        if(!Boolean(r) && Boolean(c.tag)) { //if tag for extracting username is defined 
            var u=userLink(c.tag,c.attr,c.attrV,c.match,c.usrS);
            if(Boolean(u) && Boolean(u[c.usrL])){ //if there is a folder in the href of link rel="canonical", "author" etc.
                var r=[cleanUp(u[c.usrL],c.clean,c.clPos)];
                if(Boolean(u[c.usrL+1])){ //If there is a subfolder in the canonical link
                    r.push(posT);
                    return r;
                } else if(c.sn=="instagram.com"||c.sn=="medium.com") { //Instagram
                    r.push(accT);
                    return r;
                }
            }
        } else if (!Boolean(r)) {
            var r=[cleanUp(fU,c.clean,c.clPos)];
        }
        if(!Boolean(sFU)) { //account page
            r.push(accT);
            return r;
        } else { // posting
            r.push(posT);
            return r;
        }
    } else { // subfolder username
        if(!Boolean(fU)){return;} //no user name
        var i=0;
        while(i<c.usrF.length) {
            if(fU==c.usrF[i] && Boolean(sFU)) {
                if(c.sn=="fanfiction.net" && Boolean(sSFU)) { //ffn exception
                    var r=[cleanUp(sSFU,c.clean,c.clPos)];
                } else {
                    var r=[cleanUp(sFU,c.clean,c.clPos)]; //got user name from URL
                }
            }
            i++;
        }
        if(Boolean(r)) { //if we are in a username folder
            if(Boolean(c.posF)) { //and there is a separate folder structure for posts
                r.push(accT);
                return r;
            } else if(Boolean(c.ty)) { //instead, content is under username folders & there are defined types under username folders
                var i=0;
                while(i<c.ty.length) {
                    if(c.ty[i][0]==sSFU) {
                        r.push(c.ty[i][1]);
                        return r;
                    }
                    i++;
                }
                // if none of those types fits, it's a post
                r.push(posT);
                return r;
            }
        } else if(Boolean(c.posF) && Boolean(c.tag)) { //not in a user folder, but there is a contents folder & method for extracting creator accounts
            var i=0;
            while(i<c.posF.length) {
                if(fU==c.posF[i]) { //extract user name from work link
                    var u=userLink(c.tag,c.attr,c.attrV,c.match,c.usrS);                    
                    var r=[cleanUp(u[c.usrL],c.clean,c.clPos),posT];
                    return r;                    
                }
                i++;
            }
        } else {return;} //I'm out of ideas
    }
    return;
}

// set up the post
function boost() {
    var selectedText = getSelectionHtml();
    var subjectText;

    // parsing url to break down into components for later processing
    
    var strippedURL=curURL.substr(8);
     
    // split the stripped URL string by slashes
    // first part is server and domain name  
    var serverDomain = strippedURL.split('/')[0];
    var fU = strippedURL.split('/')[1];
    var sFU = strippedURL.split('/')[2];
    var sSFU = strippedURL.split('/')[3];
    
    //split the server and domain name parts by periods
    var serverDomainParts = serverDomain.split('.');
    
    //if array serverDomainParts has only one element, it's not a valid URL and the script should be aborted
    if (serverDomainParts.length <= 1)
    {return; }
    
    // if array serverDomainParts has two elements, give empty string for subdomain
    // sN(siteName) is top & second level domain
    else if (serverDomainParts.length == 2){
        var sD = '';
        var sN = serverDomainParts[0] + '.' + serverDomainParts[1];
    }
     
    //if array serverDomainParts has three or (generally for non-U.S. domain names like co.uk) more elements, 
    //first element is subdomain, sN(siteName) is top & second level domain
    
    else if (serverDomainParts.length >=3){
        var sD = serverDomainParts[0];
        var sN = serverDomainParts[1] + '.' + serverDomainParts[2];
    }
    if(sN.includes('blogspot.co')) {
        sN = 'blogspot.com';
    }
  
    // title of current post
    var curTitle = document.title;
    
    if (sN=="dreamwidth.org" && curTitle.includes(' | '))
       {curTitle = curTitle.substr(curTitle.lastIndexOf(' | ')+3);}

    // build up the content of signal boost optionally using selected text as an excerpt
    // Removed <p> formatting and starting with a blank string
    var linkText = ""; 
     
    var uN=getUserName(sD,sN,fU,sFU,sSFU);
   
    // commented out alternate 'From' text in case of no username
    //if(!userName)
        //{linkText = linkText + 'From <strong><a href="http://' + sD + (sD=='')?'':'.' + sN + '">' + sD + (sD=='')?'':'.' + sN + '</a>:</strong> ';}


    if (Boolean(uN) && uN.length > 0) {

        var userTagSiteAttribute = sN;

         //exception for BlogSpot
         if (sN=='blogspot.com') {
             var userTagSiteAttribute = 'blogger.com';
         }
     
     //if you have a username, add user tag
        var linkText = linkText + '<user name="' + uN[0] + '" site=' + userTagSiteAttribute + '>' + uN[1] + ': ';
    }
     
    //builds rest of boost
    linkText = linkText + '<strong><a href="' + curURL + '">' + curTitle.replace('@','&commat;') + '</a></strong>';
    //linkText = linkText ; //what is this?
    if (selectedText.length > 0) {
        linkText = linkText + "\n<blockquote> " + selectedText + "</blockquote>";
        }
    
    // got rid of <p> formatting

    // checks if you are signalboosting a SignalBoost and prevents dangerous vortices from forming
    if (!curTitle.includes("Signal Boost: ")){
        subjectText = "Signal Boost: " + curTitle;}
    else {subjectText = curTitle;}

    postURL = postURL + encodeURIComponent(linkText) + "&subject=" + encodeURIComponent(subjectText);

    window.location = postURL;
}

if (confirmBoost()) {
    boost();
}

This is so lovely.

I wish DW let us host a draggable button, tho. ( I know less about coding than you do).