Fossil

** For maximum efficiency, it is best to choose the longest delay that
** does not cause timeouts in intermediate proxies or web server.
*/
/*
** SETTING: chat-alert-sound     width=10
**
** This is the name of the builtin sound file to use for the alert tone.
** The value must be the name of one of a builtin WAV file.
** The value must be the name of a builtin WAV file.
*/
/*
** WEBPAGE: chat
**
** Start up a browser-based chat session.
**
** This is the main page that humans use to access the chatroom.  Simply

  zProjectName = db_get("project-name","Unnamed project");
  style_set_current_feature("chat");
  style_header("Chat");
  @ <form accept-encoding="utf-8" id="chat-form" autocomplete="off">
  @ <div id='chat-input-area'>
  @   <div id='chat-input-line'>
  @     <input type="text" name="msg" id="chat-input-single" \
  @      placeholder="Type message for %h(zProjectName)." autocomplete="off">
  @      placeholder="Type markdown-formatted message for %h(zProjectName)." \
  @      autocomplete="off">
  @     <textarea rows="8" id="chat-input-multi" \
  @      placeholder="Type message for %h(zProjectName). Ctrl-Enter sends it." \
  @      placeholder="Type markdown-formatted message for %h(zProjectName). Ctrl-Enter sends it." \
  @      class="hidden"></textarea>
  @     <input type="submit" value="Send" id="chat-message-submit">
  @     <span id="chat-settings-button" class="settings-icon" \
  @       aria-label="Settings..." aria-haspopup="true" ></span>
  @   </div>
  @   <div id='chat-input-file-area'>
  @     <div class='file-selection-wrapper'>

  }else{
    CX("}");
  }
  fossil_free(zTime);
}

/*
** WEBPAGE: chat-send
** WEBPAGE: chat-send hidden
**
** This page receives (via XHR) a new chat-message and/or a new file
** to be entered into the chat history.
**
** On success it responds with an empty response: the new message
** should be fetched via /chat-poll. On error, e.g. login expiry,
** it emits a JSON response in the same form as described for

    blob_reset(&b);
  }
  db_commit_transaction();
}

/*
** This routine receives raw (user-entered) message text and transforms
** it into HTML that is safe to insert using innerHTML.
**
** it into HTML that is safe to insert using innerHTML. As of 2021-09-19,
** it does so by using markdown_to_html() to convert markdown-formatted
**    *   HTML in the original text is escaped.
**
** zMsg to HTML.
**    *   Hyperlinks are identified and tagged.  Hyperlinks are:
**
**          -  Undelimited text of the form https:... or http:...
**          -  Any text enclosed within [...]
**
** Space to hold the returned string is obtained from fossil_malloc()
** and must be freed by the caller.
*/
static char *chat_format_to_html(const char *zMsg){
  char *zSafe = mprintf("%h", zMsg);
  int i, j, k;
  Blob out;
  char zClose[20];
  blob_init(&out, 0, 0);
  blob_init(&out, "", 0);
  for(i=j=0; zSafe[i]; i++){
    if( zSafe[i]=='[' ){
      for(k=i+1; zSafe[k] && zSafe[k]!=']'; k++){}
      if( zSafe[k]==']' ){
        zSafe[k] = 0;
        if( j<i ){
  if(*zMsg){
          blob_append(&out, zSafe + j, i-j);
          j = i;
        }
        blob_append_char(&out, '[');
    Blob bIn;
        wiki_resolve_hyperlink(&out,
                               WIKI_NOBADLINKS|WIKI_TARGET_BLANK|WIKI_NOBRACKET,
                               zSafe+i+1, zClose, sizeof(zClose), zSafe, 0);
        zSafe[k] = ']';
        j++;
        blob_append(&out, zSafe + j, k - j);
        blob_append(&out, zClose, -1);
    blob_init(&bIn, zMsg, (int)strlen(zMsg));
        blob_append_char(&out, ']');
        i = k;
        j = k+1;
        continue;
      }
    markdown_to_html(&bIn, NULL, &out);
  }
    }else if( zSafe[i]=='h' 
           && (strncmp(zSafe+i,"http:",5)==0
               || strncmp(zSafe+i,"https:",6)==0) ){
      for(k=i+1; zSafe[k] && !fossil_isspace(zSafe[k]); k++){}
      if( k>i+7 ){
        char c = zSafe[k];
        if( !fossil_isalnum(zSafe[k-1]) && zSafe[k-1]!='/' ){
          k--;
          c = zSafe[k];
        }
        if( j<i ){
          blob_append(&out, zSafe + j, i-j);
          j = i;
        }
        zSafe[k] = 0;        
        wiki_resolve_hyperlink(&out, WIKI_NOBADLINKS|WIKI_TARGET_BLANK,
                               zSafe+i, zClose, sizeof(zClose), zSafe, 0);
        zSafe[k] = c;
        blob_append(&out, zSafe + j, k - j);
        blob_append(&out, zClose, -1);
        i = j = k;
        continue;
      }
    }
  }
  if( j<i ){
    blob_append(&out, zSafe+j, j-i);
  }
  fossil_free(zSafe);
  return blob_str(&out);
}

/*
** COMMAND: test-chat-formatter
**
** Usage: %fossil test-chat-formatter STRING ...

    zOut = chat_format_to_html(g.argv[i]);
    fossil_print("[%d]: %s\n", i, zOut);
    fossil_free(zOut);
  }
}

/*
** WEBPAGE: chat-poll
** WEBPAGE: chat-poll hidden
**
** The chat page generated by /chat using an XHR to this page to
** request new chat content.  A typical invocation is:
**
**     /chat-poll/N
**     /chat-poll?name=N
**

  db_finalize(&q1);
  blob_append(&json, "\n]}", 3);
  cgi_set_content(&json);
  return;      
}

/*
** WEBPAGE: chat-download
** WEBPAGE: chat-download hidden
**
** Download the CHAT.FILE attachment associated with a single chat
** entry.  The "name" query parameter begins with an integer that
** identifies the particular chat message. The integer may be followed
** by a / and a filename, which will indicate to the browser to use
** the indicated name when saving the file.
*/

  db_blob(&r, "SELECT file FROM chat WHERE msgid=%d", msgid);
  cgi_set_content_type(zMime);
  cgi_set_content(&r);
}


/*
** WEBPAGE: chat-delete
** WEBPAGE: chat-delete hidden
**
** Delete the chat entry identified by the name query parameter.
** Invoking fetch("chat-delete/"+msgid) from javascript in the client
** will delete a chat entry from the CHAT table.
**
** This routine both deletes the identified chat entry and also inserts
** a new entry with the current timestamp and with: