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Server-side hooks

These hooks are called on server-side.

loadSettings

Called from: src/node/server.js

Things in context:

settings - the settings object

Use this hook to receive the global settings in your plugin.

shutdown

Called from: src/node/server.js

Things in context: None

This hook runs before shutdown. Use it to stop timers, close sockets and files, flush buffers, etc. The database is not available while this hook is running. The shutdown function must not block for long because there is a short timeout before the process is forcibly terminated.

The shutdown function must return a Promise, which must resolve to undefined. Returning callback(value) will return a Promise that is resolved to value.

Example:

// using an async function
exports.shutdown = async (hookName, context) => {
  await flushBuffers();
};

pluginUninstall

Called from: src/static/js/pluginfw/installer.js

Things in context:

plugin_name - self-explanatory

If this hook returns an error, the callback to the uninstall function gets an error as well. This mostly seems useful for handling additional features added in based on the installation of other plugins, which is pretty cool!

pluginInstall

Called from: src/static/js/pluginfw/installer.js

Things in context:

plugin_name - self-explanatory

If this hook returns an error, the callback to the install function gets an error, too. This seems useful for adding in features when a particular plugin is installed.

init_`<plugin name>`

Called from: src/static/js/pluginfw/plugins.js

Things in context: None

This function is called after a specific plugin is initialized. This would probably be more useful than the previous two functions if you only wanted to add in features to one specific plugin.

expressConfigure

Called from: src/node/hooks/express.js

Things in context:

app - the main application object

This is a helpful hook for changing the behavior and configuration of the application. It's called right after the application gets configured.

expressCreateServer

Called from: src/node/hooks/express.js

Things in context:

app - the main express application object (helpful for adding new paths and such)
server - the http server object

This hook gets called after the application object has been created, but before it starts listening. This is similar to the expressConfigure hook, but it's not guaranteed that the application object will have all relevant configuration variables.

eejsBlock_`<name>`

Called from: src/node/eejs/index.js

Things in context:

content - the content of the block

This hook gets called upon the rendering of an ejs template block. For any specific kind of block, you can change how that block gets rendered by modifying the content object passed in.

Available blocks in pad.html are:

htmlHead - after <html> and immediately before the title tag
styles - the style <link>s
body - the contents of the body tag
editbarMenuLeft - the left tool bar (consider using the toolbar controller instead of manually adding html here)
editbarMenuRight - right tool bar
afterEditbar - allows you to add stuff immediately after the toolbar
userlist - the contents of the userlist dropdown
loading - the initial loading message
mySettings - the left column of the settings dropdown ("My view"); intended for adding checkboxes only
mySettings.dropdowns - add your dropdown settings here
globalSettings - the right column of the settings dropdown ("Global view")
importColumn - import form
exportColumn - export form
modals - Contains all connectivity messages
embedPopup - the embed dropdown
scripts - Add your script tags here, if you really have to (consider use client-side hooks instead)

timeslider.html blocks:

timesliderStyles
timesliderScripts
timesliderBody
timesliderTop
timesliderEditbarRight
modals

index.html blocks:

indexCustomStyles - contains the index.css <link> tag, allows you to add your own or to customize the one provided by the active skin
indexWrapper - contains the form for creating new pads
indexCustomScripts - contains the index.js <script> tag, allows you to add your own or to customize the one provided by the active skin
indexCustomInlineScripts - contains the inline <script> of home page, allows you to customize go2Name(), go2Random() or randomPadName() functions

padInitToolbar

Called from: src/node/hooks/express/specialpages.js

Things in context:

toolbar - the toolbar controller that will render the toolbar eventually

Here you can add custom toolbar items that will be available in the toolbar config in settings.json. For more about the toolbar controller see the API section.

Usage examples:

https://github.com/tiblu/ep_authorship_toggle

onAccessCheck

Called from: src/node/db/SecurityManager.js

Things in context:

padID - the pad the user wants to access
password - the password the user has given to access the pad
token - the token of the author
sessionCookie - the session the use has

This hook gets called when the access to the concrete pad is being checked. Return false to deny access.

padCreate

Called from: src/node/db/Pad.js

Things in context:

pad - the pad instance
author - the id of the author who created the pad

This hook gets called when a new pad was created.

padLoad

Called from: src/node/db/Pad.js

Things in context:

pad - the pad instance

This hook gets called when a pad was loaded. If a new pad was created and loaded this event will be emitted too.

padUpdate

Called from: src/node/db/Pad.js

Things in context:

pad - the pad instance
author - the id of the author who updated the pad

This hook gets called when an existing pad was updated.

padCopy

Called from: src/node/db/Pad.js

Things in context:

originalPad - the source pad instance
destinationID - the id of the pad copied from originalPad

This hook gets called when an existing pad was copied.

Usage examples:

https://github.com/ether/ep_comments

padRemove

Called from: src/node/db/Pad.js

Things in context:

padID

This hook gets called when an existing pad was removed/deleted.

Usage examples:

https://github.com/ether/ep_comments

socketio

Called from: src/node/hooks/express/socketio.js

Things in context:

app - the application object
io - the socketio object
server - the http server object

I have no idea what this is useful for, someone else will have to add this description.

authorize

Called from: src/node/hooks/express/webaccess.js

Things in context:

req - the request object
res - the response object
next - ?
resource - the path being accessed

This hook is called to handle authorization. It is especially useful for controlling access to specific paths.

A plugin's authorize function is typically called twice for each access: once before authentication and again after. Specifically, it is called if all of the following are true:

The request is not for static content or an API endpoint. (Requests for static content and API endpoints are always authorized, even if unauthenticated.)
Either authentication has not yet been performed (context.req.session.user is undefined) or the user has successfully authenticated (context.req.session.user is an object containing user-specific settings).
If the user has successfully authenticated, the user is not an admin. (Admin users are always authorized.)
Either the request is for an /admin page or the requireAuthentication setting is true.
Either the request is for an /admin page, or the user has not yet authenticated, or the user has authenticated and the requireAuthorization setting is true.
For pre-authentication invocations of a plugin's authorize function (context.req.session.user is undefined), an authorize function from a different plugin has not already caused the pre-authentication authorization to pass or fail.
For post-authentication invocations of a plugin's authorize function (context.req.session.user is an object), an authorize function from a different plugin has not already caused the post-authentication authorization to pass or fail.

For pre-authentication invocations of your authorize function, you can pass the following values to the provided callback:

[true], ['create'], or ['modify'] will immediately grant access without requiring the user to authenticate.
[false] will trigger authentication unless authentication is not required.
[] or undefined will defer the decision to the next authorization plugin (if any, otherwise it is the same as calling with [false]).

WARNING: Your authorize function can be called for an /admin page even if the user has not yet authenticated. It is your responsibility to fail or defer authorization if you do not want to grant admin privileges to the general public.

For post-authentication invocations of your authorize function, you can pass the following values to the provided callback:

[true] or ['create'] will grant access to modify or create the pad if the request is for a pad, otherwise access is simply granted. (Access will be downgraded to modify-only if settings.editOnly is true.)
['modify'] will grant access to modify but not create the pad if the request is for a pad, otherwise access is simply granted.
[false] will deny access.
[] or undefined will defer the authorization decision to the next authorization plugin (if any, otherwise deny).

Example:

exports.authorize = (hookName, context, cb) => {
  const user = context.req.session.user;
  if (!user) {
    // The user has not yet authenticated so defer the pre-authentication
    // authorization decision to the next plugin.
    return cb([]);
  }
  const path = context.req.path;  // or context.resource
  if (isExplicitlyProhibited(user, path)) return cb([false]);
  if (isExplicitlyAllowed(user, path)) return cb([true]);
  return cb([]);  // Let the next authorization plugin decide
};

authenticate

Called from: src/node/hooks/express/webaccess.js

Things in context:

req - the request object
res - the response object
users - the users object from settings.json (possibly modified by plugins)
next - ?
username - the username used (optional)
password - the password used (optional)

This hook is called to handle authentication.

Plugins that supply an authenticate function should probably also supply an authnFailure function unless falling back to HTTP basic authentication is appropriate upon authentication failure.

This hook is only called if either the requireAuthentication setting is true or the request is for an /admin page.

Calling the provided callback with [true] or [false] will cause authentication to succeed or fail, respectively. Calling the callback with [] or undefined will defer the authentication decision to the next authentication plugin (if any, otherwise fall back to HTTP basic authentication).

If you wish to provide a mix of restricted and anonymous access (e.g., some pads are private, others are public), you can "authenticate" (as a guest account) users that have not yet logged in, and rely on other hooks (e.g., authorize, onAccessCheck, handleMessageSecurity) to authorize specific privileged actions.

If authentication is successful, the authenticate function MUST set context.req.session.user to the user's settings object. The username property of this object should be set to the user's username. The settings object should come from global settings (context.users[username]).

Example:

exports.authenticate = (hook_name, context, cb) => {
  if (notApplicableToThisPlugin(context)) {
    return cb([]);  // Let the next authentication plugin decide
  }
  const username = authenticate(context);
  if (!username) {
    console.warn(`ep_myplugin.authenticate: Failed authentication from IP ${context.req.ip}`);
    return cb([false]);
  }
  console.info(`ep_myplugin.authenticate: Successful authentication from IP ${context.req.ip} for user ${username}`);
  const users = context.users;
  if (!(username in users)) users[username] = {};
  users[username].username = username;
  context.req.session.user = users[username];
  return cb([true]);
};

authFailure

Called from: src/node/hooks/express/webaccess.js

Things in context:

req - the request object
res - the response object
next - ?

DEPRECATED: Use authnFailure or authzFailure instead.

This hook is called to handle an authentication or authorization failure.

Plugins that supply an authenticate function should probably also supply an authnFailure function unless falling back to HTTP basic authentication is appropriate upon authentication failure.

A plugin's authFailure function is only called if all of the following are true:

There was an authentication or authorization failure.
The failure was not already handled by an authFailure function from another plugin.
For authentication failures: The failure was not already handled by the authnFailure hook.
For authorization failures: The failure was not already handled by the authzFailure hook.

Calling the provided callback with [true] tells Etherpad that the failure was handled and no further error handling is required. Calling the callback with [] or undefined defers error handling to the next authFailure plugin (if any, otherwise fall back to HTTP basic authentication for an authentication failure or a generic 403 page for an authorization failure).

Example:

exports.authFailure = (hookName, context, cb) => {
  if (notApplicableToThisPlugin(context)) {
    return cb([]);  // Let the next plugin handle the error
  }
  context.res.redirect(makeLoginURL(context.req));
  return cb([true]);
};

authnFailure

Called from: src/node/hooks/express/webaccess.js

Things in context:

req - the request object
res - the response object

This hook is called to handle an authentication failure.

Plugins that supply an authenticate function should probably also supply an authnFailure function unless falling back to HTTP basic authentication is appropriate upon authentication failure.

A plugin's authnFailure function is only called if the authentication failure was not already handled by an authnFailure function from another plugin.

Calling the provided callback with [true] tells Etherpad that the failure was handled and no further error handling is required. Calling the callback with [] or undefined defers error handling to an authnFailure function from another plugin (if any, otherwise fall back to the deprecated authFailure hook).

Example:

exports.authnFailure = (hookName, context, cb) => {
  if (notApplicableToThisPlugin(context)) return cb([]);
  context.res.redirect(makeLoginURL(context.req));
  return cb([true]);
};

authzFailure

Called from: src/node/hooks/express/webaccess.js

Things in context:

req - the request object
res - the response object

This hook is called to handle an authorization failure.

A plugin's authzFailure function is only called if the authorization failure was not already handled by an authzFailure function from another plugin.

Calling the provided callback with [true] tells Etherpad that the failure was handled and no further error handling is required. Calling the callback with [] or undefined defers error handling to an authzFailure function from another plugin (if any, otherwise fall back to the deprecated authFailure hook).

Example:

exports.authzFailure = (hookName, context, cb) => {
  if (notApplicableToThisPlugin(context)) return cb([]);
  if (needsPremiumAccount(context.req) && !context.req.session.user.premium) {
    context.res.status(200).send(makeUpgradeToPremiumAccountPage(context.req));
    return cb([true]);
  }
  // Use the generic 403 forbidden response.
  return cb([]);
};

handleMessage

Called from: src/node/handler/PadMessageHandler.js

Things in context:

message - the message being handled
client - the socket.io Socket object

This hook allows plugins to drop or modify incoming socket.io messages from clients, before Etherpad processes them.

The handleMessage function must return a Promise. If the Promise resolves to null, the message is dropped. Returning callback(value) will return a Promise that is resolved to value.

Examples:

// Using an async function:
exports.handleMessage = async (hookName, {message, client}) => {
  if (message.type === 'USERINFO_UPDATE') {
    // Force the display name to the name associated with the account.
    const user = client.client.request.session.user || {};
    if (user.name) message.data.userInfo.name = user.name;
  }
};

// Using a regular function:
exports.handleMessage = (hookName, {message, client}, callback) => {
  if (message.type === 'USERINFO_UPDATE') {
    // Force the display name to the name associated with the account.
    const user = client.client.request.session.user || {};
    if (user.name) message.data.userInfo.name = user.name;
  }
  return cb();
};

handleMessageSecurity

Called from: src/node/handler/PadMessageHandler.js

Things in context:

message - the message being handled
client - the socket.io Socket object

This hook allows plugins to grant temporary write access to a pad. It is called for each incoming message from a client. If write access is granted, it applies to the current message and all future messages from the same socket.io connection until the next CLIENT_READY or SWITCH_TO_PAD message. Read-only access is reset after each CLIENT_READY or SWITCH_TO_PAD message, so granting write access has no effect for those message types.

The handleMessageSecurity function must return a Promise. If the Promise resolves to true, write access is granted as described above. Returning callback(value) will return a Promise that is resolved to value.

Examples:

// Using an async function:
exports.handleMessageSecurity = async (hookName, {message, client}) => {
  if (shouldGrantWriteAccess(message, client)) return true;
  return;
};

// Using a regular function:
exports.handleMessageSecurity = (hookName, {message, client}, callback) => {
  if (shouldGrantWriteAccess(message, client)) return callback(true);
  return callback();
};

clientVars

Called from: src/node/handler/PadMessageHandler.js

Things in context:

clientVars - the basic clientVars built by the core
pad - the pad this session is about
socket - the socket.io Socket object

This hook is called after a client connects but before the initial configuration is sent to the client. Plugins can use this hook to manipulate the configuration. (Example: Add a tracking ID for an external analytics tool that is used client-side.)

The clientVars function must return a Promise that resolves to an object (or null/undefined) whose properties will be merged into context.clientVars. Returning callback(value) will return a Promise that is resolved to value.

You can modify context.clientVars to change the values sent to the client, but beware: async functions from other clientVars plugins might also be reading or manipulating the same context.clientVars object. For this reason it is recommended you return an object rather than modify context.clientVars.

If needed, you can access the user's account information (if authenticated) via context.socket.client.request.session.user.

Examples:

// Using an async function
exports.clientVars = async (hookName, context) => {
  const user = context.socket.client.request.session.user || {};
  return {'accountUsername': user.username || '<unknown>'}
};

// Using a regular function
exports.clientVars = (hookName, context, callback) => {
  const user = context.socket.client.request.session.user || {};
  return callback({'accountUsername': user.username || '<unknown>'});
};

This can be accessed on the client-side using clientVars.currentYear.

getLineHTMLForExport

Called from: src/node/utils/ExportHtml.js

Things in context:

apool - pool object
attribLine - line attributes
text - line text

This hook will allow a plug-in developer to re-write each line when exporting to HTML.

Example:

var Changeset = require("ep_etherpad-lite/static/js/Changeset");

exports.getLineHTMLForExport = function (hook, context) {
  var header = _analyzeLine(context.attribLine, context.apool);
  if (header) {
    return "<" + header + ">" + context.lineContent + "</" + header + ">";
  }
}

function _analyzeLine(alineAttrs, apool) {
  var header = null;
  if (alineAttrs) {
    var opIter = Changeset.opIterator(alineAttrs);
    if (opIter.hasNext()) {
      var op = opIter.next();
      header = Changeset.opAttributeValue(op, 'heading', apool);
    }
  }
  return header;
}

stylesForExport

Called from: src/node/utils/ExportHtml.js

Things in context:

padId - The Pad Id

This hook will allow a plug-in developer to append Styles to the Exported HTML.

Example:

exports.stylesForExport = function(hook, padId, cb){
  cb("body{font-size:13.37em !important}");
}

aceAttribClasses

Called from: src/static/js/linestylefilter.js

Things in context:

Attributes - Object of Attributes

This hook is called when attributes are investigated on a line. It is useful if you want to add another attribute type or property type to a pad.

Example:

exports.aceAttribClasses = function(hook_name, attr, cb){
  attr.sub = 'tag:sub';
  cb(attr);
}

exportFileName

Called from src/node/handler/ExportHandler.js

Things in context:

padId

This hook will allow a plug-in developer to modify the file name of an exported pad. This is useful if you want to export a pad under another name and/or hide the padId under export. Note that the doctype or file extension cannot be modified for security reasons.

Example:

exports.exportFileName = function(hook, padId, callback){
  callback("newFileName"+padId);
}

exportHtmlAdditionalTags

Called from src/node/utils/ExportHtml.js

Things in context:

Pad object

This hook will allow a plug-in developer to include more properties and attributes to support during HTML Export. If tags are stored as ['color', 'red'] on the attribute pool, use exportHtmlAdditionalTagsWithData instead. An Array should be returned.

Example:

// Add the props to be supported in export
exports.exportHtmlAdditionalTags = function(hook, pad, cb){
  var padId = pad.id;
  cb(["massive","jugs"]);
};

exportHtmlAdditionalTagsWithData

Called from src/node/utils/ExportHtml.js

Things in context:

Pad object

Identical to exportHtmlAdditionalTags, but for tags that are stored with a specific value (not simply true) on the attribute pool. For example ['color', 'red'], instead of ['bold', true]. This hook will allow a plug-in developer to include more properties and attributes to support during HTML Export. An Array of arrays should be returned. The exported HTML will contain tags like <span data-color="red"> for the content where attributes are ['color', 'red'].

Example:

// Add the props to be supported in export
exports.exportHtmlAdditionalTagsWithData = function(hook, pad, cb){
  var padId = pad.id;
  cb([["color", "red"], ["color", "blue"]]);
};

userLeave

Called from src/node/handler/PadMessageHandler.js

This in context:

session (including the pad id and author id)

This hook gets called when an author leaves a pad. This is useful if you want to perform certain actions after a pad has been edited

Example:

exports.userLeave = function(hook, session, callback) {
  console.log('%s left pad %s', session.author, session.padId);
};

clientReady

Called from src/node/handler/PadMessageHandler.js

This in context:

message

This hook gets called when handling a CLIENT_READY which is the first message from the client to the server.

Example:

exports.clientReady = function(hook, message) {
  console.log('Client has entered the pad' + message.padId);
};

24 KiB Raw Blame History

Server-side hooks

loadSettings

shutdown

pluginUninstall

pluginInstall

init_<plugin name>

expressConfigure

expressCreateServer

eejsBlock_<name>

padInitToolbar

onAccessCheck

padCreate

padLoad

padUpdate

padCopy

padRemove

socketio

authorize

authenticate

authFailure

authnFailure

authzFailure

handleMessage

handleMessageSecurity

clientVars

getLineHTMLForExport

stylesForExport

aceAttribClasses

exportFileName

exportHtmlAdditionalTags

exportHtmlAdditionalTagsWithData

userLeave

clientReady

24 KiB

Raw Blame History

init_`<plugin name>`

eejsBlock_`<name>`