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!7

sS passwordSalt() {
  ret loadTextFileOrCreateWithRandomID(javaxSecretDir("password-salt"));
}

concept PostReferenceable {}

concept User > PostReferenceable {
  S name;
  SecretValue<S> passwordMD5;
  S contact; // e.g. mail address
  bool isMaster;

  toString { ret nempty(name) ? "User " + name : super.toString(); }
}

extend AuthedDialogID {
  new Ref<User> user; // who is logged in
  bool userMode; // show things as if user was not master
}

concept UserCreatedObject > PostReferenceable {
  new Ref<User> creator;
  //S nameInRepo; // unique by user, for URL
  bool isPublic = true;
}

concept UserPost > UserCreatedObject {
  S type, title, text;

  S text() { ret text; }

  new RefL<PostReferenceable> postRefs;
  new LS postRefTags;

  sS _fieldOrder = "isPublic text type title postRefs";

  toString {
    ret "Post by " + userName(creator!) + ": " + (nempty(title) ? shorten(title) : shorten(text));
  }
}

!include once #1029928 // new Compact Module include
set flag NoNanoHTTPD.

/*c*/module GazelleExamples > DynNewBot2 {
  void start {
    botName = heading = adminName = "gazelle.rocks";
    set enableUsers;
    set useWebSockets;
    set showRegisterLink;
    unset showTalkToBotLink;
    set alwaysRedirectToHttps;
    passwordSalt(); // make early
    super.start();
    db_mainConcepts().modifyOnCreate = true;
    indexConceptFieldCI(User, "name");
  }

  L<Class> crudClasses(Req req) {
    L<Class> l = super.crudClasses(req);
    l.add(UserPost);
    if (req.masterAuthed)
      l.add(User);
    ret l;
  }

  S serveRegisterForm(SS params) {
    S user = trim(params.get("user"));
    S pw = trim(params.get("f_pw"));
    S pw2 = trim(params.get("pw2"));
    S redirect = params.get("redirect");
    S contact = trim(params.get("contact"));
    
    redirect = dropParamFromURL(redirect, "logout"); // don't log us out right again
    if (empty(redirect)) redirect = baseLink + "/";

    new LS msgs;
    if (nempty(user) || nempty(pw)) {
      lock dbLock();
      if (empty(user)) msgs.add("Please enter a user name");
        else if (l(user) < 4) msgs.add("Minimum user name length: 4 characters");
        else if (l(user) > 30) msgs.add("Maximum user name length: 30 characters");
        else if (hasConceptIC User(name := user))
          msgs.add("This user exists, please choose a different name");
      if (regexpContainsIC("[^a-z0-9\\-\\.]", user))
        msgs.add("Bad characters in user name (please use only a-z, 0-9, - and .)");
      if (empty(pw)) msgs.add("Please enter a password");
        else if (l(pw) < 6) msgs.add("Minimum password length: 6 characters");
      if (neq(pw, pw2)) msgs.add("Passwords don't match");

      if (empty(msgs)) {
        cnew User(name := user, passwordMD5 := SecretValue(hashPW(pw)), +contact);
        ret hrefresh(5.0, redirect) + "User " + user + " created! Redirecting...";
      }
    }
    
    ret hhtml(hhead(htitle("Register new user")
      + hsansserif() + hmobilefix() + hresponstable()) + hbody(hfullcenter(
      h3_htmlEncode(adminName + " | Register new user")
      + hpostform(
          hhidden(+redirect)
          + tag table(
            (empty(msgs) ? "" : tr(td() + td() + td(htmlEncode2_nlToBr(lines_rtrim(msgs)))))
          + tr(td_valignTop("Choose a user name:")
            + td_valignTop(hinputfield(+user) + "<br>" + "(Minimum length 4. Characters allowed: a-z, 0-9, - and .)"))
          + tr(td_valignTop("Choose a password:")
            + td_valignTop(hpassword(f_pw := pw) + "<br>" + "(Minimum length 6 characters)"))
          + tr(td_valignTop("Repeat the password please:") + td(hpassword(+pw2)))
          + tr(td_valignTop("Way to contact you (e.g. e-mail) - optional:") + td(hpassword(+contact)))
          + tr(td() + td(hsubmit("Register"))), class := "responstable"),
        action := baseLink + "/register")
      )));
  }

  bool calcMasterAuthed(Req req) {
    ret super.calcMasterAuthed(req)
      || req.auth != null && req.auth.user.has() && req.auth.user->isMaster;
  }
  
  O serveOtherPage(Req req) {
    S uri = req.uri;
    new Matches m;
    
    if (eq(uri, "/register"))
      ret serveRegisterForm(req.params);

    if (eq(uri, "/becomeMaster") && req.auth != null && req.auth.user != null) {
      S pw = trim(req.params.get("masterPW"));
      if (eq(pw, realPW())) {
        cset(req.auth.user, isMaster := true);
        ret "You are master, " + req.auth.user + "!";
      }
      if (nempty(pw))
        ret "Bad master PW";
      ret hhtml(hhead(htitle("Become master")
        + hsansserif() + hmobilefix() + hresponstable()) + hbody(hfullcenter(
      h3_htmlEncode(adminName + " | Become master")
      + hpostform(
            tag table(
            tr(td_valignTop("You are:")
            + td_valignTop(htmlEncode2(req.auth.user->name)))
          + tr(td_valignTop("Enter the master password:")
            + td_valignTop(hpassword(masterPW := pw)))
          + tr(td() + td(hsubmit("Become master user"))), class := "responstable"),
        action := baseLink + "/becomeMaster")
      )));
    }

    if (swic(uri, "/text/", m)) {
      long id = parseLong(m.rest());
      UserPost post = getConceptOpt UserPost(id);
      if (post == null) ret serve404("Post with ID " + id + " not found");
      if (!post.isPublic) ret serve404("Post is not public");
      ret serveText(post.text());
    }

    S uri2 = dropSlashPrefix(uri);
    if (isInteger(uri2)) {
      long id = parseLong(uri2);
      UserPost post = getConceptOpt UserPost(id);
      if (post == null) ret serve404("Post with ID " + id + " not found");
      ret servePost(post);
    }

    try object serveOtherPage2(req);
      
    ret super.serveOtherPage(req);
  }

  !include #1029962 // serveOtherPage2

  O servePost(UserPost post) {
    if (!post.isPublic) ret serve404("Post is not public");
    new HTMLFramer1 framer;
    framer.title = post.title;
    framer.add(p("By " + (post.creator.has() ? htmlEncode2(post.creator->name) : "?") + ". " + renderConceptDate(post)));
    if (nempty(post.type))
      framer.add(p("Post type: "+ htmlEncode2(post.type)));
    framer.add(hsourcecode(post.text));

    // show referencing posts
    Cl<UserPost> refs = sortedByConceptID(instancesOf UserPost(allBackRefs(concept)));
    if (nempty(refs)) {
      framer.add(p("Referenced by posts:",
        ul(map(refs, ref -> ahref(postLink(ref),
          htmlEncode_nlToBr_withIndents(str(ref)))))));
    }
    ret framer.render();
  }

  S serveAuthForm(S redirect) {
    ret hAddToHead(super.serveAuthForm(redirect), hInitWebSocket());
  }
  
  // handle user log-in (create/update AuthedDialogID concept)
  O handleAuth(Req req, S cookie) null {
    S name = trim(req.params.get('user)), pw = trim(req.params.get('pw));
    if (nempty(name) && nempty(pw) && nempty(cookie)) {
      Domain authDomain;
      User user = conceptWhereCI User(+name);
      if (user == null)
        ret errorMsg("User " + htmlEncode2(name) + " not found");
      if (!eq(getVar(user.passwordMD5), hashPW(pw)))
        ret errorMsg("Bad password, please try again");

      // auth
      cset(uniq AuthedDialogID(+cookie), restrictedToDomain := null, master := user.isMaster, +user);

      S redirect = req.params.get('redirect);
      if (nempty(redirect))
        ret hrefresh(redirect);
    }
  }

  O serve2(Req req) {
    S userMode = req.params.get("userMode");
    if (nempty(userMode) && req.auth != null)
      req.auth.userMode = eq(userMode, "1");

    ret super.serve2(req);
  }

  S hashPW(S pw) { ret md5(pw + passwordSalt()); }

  bool inMasterMode(Req req) {
    ret req.masterAuthed && !req.auth.userMode;
  }

  MapSO filtersForClass(Class c, Req req) {
    if (c == UserPost) {
      if (!inMasterMode(req))
        ret litmap(creator := req.auth.user!);
    }
    ret super.filtersForClass(c, req);
  }
  
  S loggedInUserDesc(Req req) {
    ret req.auth == null ? "not logged in" : req.auth.user! == null ? (req.masterAuthed ? "master user" : "weird user") : "user " + req.auth.user->name;
  }

  <A extends Concept> HCRUD_Concepts<A> crudData(Class<A> c, Req req) {
    HCRUD_Concepts<A> cc = super.crudData(c, req);
    if (c == UserPost) {
      cc.addRenderer("text", new HCRUD_Data.TextArea(80, 10));
      cc.fieldHelp(
        type := "Type of post (any format, optional)",
        title := "Title for this post (any format, optional)",
        text := "Text contents of this post (any format)",
        nameInRepo := "Name in repository (not really used yet)");
      cc.massageItemMapForList = (item, map) -> {
        applyFunctionToValue shorten(map, "text", "title", "type", "nameInRepo");
      };
      cc.emptyObject = () -> {
        MapSO item = cc.emptyObject_base();
        item.put(creator := req.auth.user!); // set default creator to current user if in master mode
        ret item;
      };
    }
    ret cc;
  }

  <A extends Concept> HCRUD makeCRUD(Class<A> c, Req req) {
    HCRUD crud = super.makeCRUD(c, req);
    if (c == UserPost) {
      crud.renderCmds = map -> {
        UserPost post = getConcept UserPost(toLong(crud.itemID(map)));
        ret joinNemptiesWithVBar(crud.renderCmds_base(map),
          targetBlank(postLink(post), "Show post"));
      };
      crud.uneditableFields = litset("postRefTags");
    }
    
    if (c == User)
      crud.uneditableFields = litset("passwordMD5");

    ret crud;
  }
  
  S authFormHeading() {
    ret h3_htmlEncode("Welcome to the Gazelle AI System")
      + p(hsnippetimg_scaleToWidth(200, #1101482, 425, 257, title := "Gazelle"));
  }

  void makeFramer(Req req) {
    super.makeFramer(req);
    if (req.masterAuthed)
      req.framer.add(p_vbar(
        ahrefIf(req.auth.userMode, appendQueryToURL(baseLink + req.uri, userMode := 0), "Master mode", title := "View pages as master"),
        ahrefIf(!req.auth.userMode, appendQueryToURL(baseLink + req.uri, userMode := 1), "User mode", title := "View pages as user")));
  }

  // link to show post
  S postLink(UserPost post) {
    ret baseLink + "/" + post.id;
  }
} // end of module

sS userName(User user) {
  ret user != null ? user.name : "?";
}