Etherpad plugin to dynamically generate a pad's initial content.

From the Etherpad working directory, run:

npm install --no-save --legacy-peer-deps ep_dynamic_default_content

Or, install from Etherpad's /admin/plugins page.

To obtain the pad's initial content from MariaDB (MySQL), add something like the following to your settings.json:

  "ep_dynamic_default_content": {
    "type": "mariadb",
    "mariadb": {
      "config": "mariadb://username:password@host/database",
      "sql": "SELECT txt FROM config WHERE customer = REGEXP_SUBSTR(:padId, '^[^-]+');"
    }
  },

Properties of the mariadb object:

• config (required): Any value accepted by the mariadb.createPool() function.
• sql (required): Query to issue to obtain the pad content. This may use any of the following named placeholders:
  • :authorId (string): The author ID of the user that is creating the pad.
  • :padId (string): The pad's ID.

The query should return one row with one column containing the desired text.

You can run arbitrary code to generate the default pad content by adding something like the following to your settings.json:

  "ep_dynamic_default_content": {
    "type": "javascript",
    "javascript": {
      "settings": {"place": "world"},
      "init": "return {place: settings.place.toUpperCase()};",
      "handle": "ctx.type = 'text'; ctx.content = `hello ${state.place}!`;",
      "shutdown": "doCleanupStuff(state);"
    }
  },

Properties of the javascript object:

• settings (optional): Arbitrary value that will be passed to your init function (if provided).

• init (optional): Body of an AsyncFunction that performs any desired initialization at startup.

  Parameters:

  • settings: The value of the ep_dynamic_default_content.javascript.settings property in your settings.json, or nullish if your settings.json does not have such a value.

  Return value: Optional. If your code returns a value, that value will be passed as the state parameter to the handle and shutdown functions.

• handle (required): Body of an AsyncFunction that is called to obtain a new pad's initial content.

  Parameters:

  • state: The value returned by the init function, or nullish if you did not provide an init function or the init function did not return a value.

  • ctx: The context object for the padDefaultContent hook.

  Return value: ignored.

• shutdown (optional): Body of an AsyncFunction that is called when Etherpad is shutting down or restarted. Use this to clean up any state (e.g., cancel timers, close connections) created by your init or handle functions.

  Parameters:

  • state: The value returned by the init function, or nullish if you did not provide an init function or the init function did not return a value.

Copyright © 2022 Richard Hansen and the ep_dynamic_default_content authors and contributors

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.