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README.md

HackMD Community Edition

Standard - JavaScript Style Guide

Join the chat at https://gitter.im/hackmdio/hackmd #HackMD on matrix.org build status version Help Contribute to Open Source POEditor

HackMD lets you create realtime collaborative markdown notes on all platforms. Inspired by Hackpad, with more focus on speed and flexibility. Still in the early stage, feel free to fork or contribute to HackMD.

Thanks for using! 😄

Table of Contents

Browsers Requirement

  • Chrome Chrome >= 47, Chrome for Android >= 47
  • Safari Safari >= 9, iOS Safari >= 8.4
  • Firefox Firefox >= 44
  • IE IE >= 9, Edge >= 12
  • Opera Opera >= 34, Opera Mini not supported
  • Android Browser >= 4.4

Installation

Getting started (Native install)

Prerequisite

  • Node.js 6.x or up (test up to 7.5.0)
  • Database (PostgreSQL, MySQL, MariaDB, SQLite, MSSQL) use charset utf8
  • npm (and its dependencies, especially uWebSockets, node-gyp)
  • For building HackMD we recommend to use a machine with at least 2GB RAM

Instructions

  1. Download a release and unzip or clone into a directory
  2. Enter the directory and type bin/setup, which will install npm dependencies and create configs. The setup script is written in Bash, you would need bash as a prerequisite.
  3. Setup the configs, see more below
  4. Setup environment variables which will overwrite the configs
  5. Build front-end bundle by npm run build (use npm run dev if you are in development)
  6. Run the server as you like (node, forever, pm2)

Heroku Deployment

You can quickly setup a sample Heroku HackMD application by clicking the button below.

Deploy on Heroku

If you deploy it without the button, keep in mind to use the right buildpacks. For details check app.json.

HackMD by docker container

Try in PWD

Debian-based version:

latest

Alpine-based version:

alpine

The easiest way to setup HackMD using docker are using the following three commands:

git clone https://github.com/hackmdio/docker-hackmd.git
cd docker-hackmd
docker-compose up

Read more about it in the docker repository…

Upgrade

Native setup

If you are upgrading HackMD from an older version, follow these steps:

  1. Fully stop your old server first (important)
  2. git pull or do whatever that updates the files
  3. npm install to update dependencies
  4. Build front-end bundle by npm run build (use npm run dev if you are in development)
  5. Modify the file named .sequelizerc, change the value of the variable url with your db connection string For example: postgres://username:password@localhost:5432/hackmd
  6. Run node_modules/.bin/sequelize db:migrate, this step will migrate your db to the latest schema
  7. Start your whole new server!
  • migrate-to-1.1.0

We deprecated the older lower case config style and moved on to camel case style. Please have a look at the current config.json.example and check the warnings on startup.

Notice: This is not a breaking change right now but in the future

We don't use LZString to compress socket.io data and DB data after version 0.5.0. Please run the migration tool if you're upgrading from the old version.

We've dropped MongoDB after version 0.4.0. So here is the migration tool for you to transfer the old DB data to the new DB. This tool is also used for official service.

Configuration

There are some config settings you need to change in the files below.

./config.json      ----application settings

Environment variables (will overwrite other server configs)

variables example values description
NODE_ENV production or development set current environment (will apply corresponding settings in the config.json)
DEBUG true or false set debug mode; show more logs
HMD_DOMAIN hackmd.io domain name
HMD_URL_PATH hackmd sub URL path, like www.example.com/<URL_PATH>
HMD_PORT 80 web app port
HMD_ALLOW_ORIGIN localhost, hackmd.io domain name whitelist (use comma to separate)
HMD_PROTOCOL_USESSL true or false set to use SSL protocol for resources path (only applied when domain is set)
HMD_URL_ADDPORT true or false set to add port on callback URL (ports 80 or 443 won't be applied) (only applied when domain is set)
HMD_USECDN true or false set to use CDN resources or not (default is true)
HMD_ALLOW_ANONYMOUS true or false set to allow anonymous usage (default is true)
HMD_ALLOW_ANONYMOUS_EDITS true or false if allowAnonymous is true, allow users to select freely permission, allowing guests to edit existing notes (default is false)
HMD_ALLOW_FREEURL true or false set to allow new note creation by accessing a nonexistent note URL
HMD_DEFAULT_PERMISSION freely, editable, limited, locked or private set notes default permission (only applied on signed users)
HMD_DB_URL mysql://localhost:3306/database set the database URL
HMD_SESSION_SECRET no example Secret used to sign the session cookie. If non is set, one will randomly generated on startup
HMD_SESSION_LIFE 1209600000 Session life time. (milliseconds)
HMD_FACEBOOK_CLIENTID no example Facebook API client id
HMD_FACEBOOK_CLIENTSECRET no example Facebook API client secret
HMD_TWITTER_CONSUMERKEY no example Twitter API consumer key
HMD_TWITTER_CONSUMERSECRET no example Twitter API consumer secret
HMD_GITHUB_CLIENTID no example GitHub API client id
HMD_GITHUB_CLIENTSECRET no example GitHub API client secret
HMD_GITLAB_SCOPE read_user or api GitLab API requested scope (default is api) (GitLab snippet import/export need api scope)
HMD_GITLAB_BASEURL no example GitLab authentication endpoint, set to use other endpoint than GitLab.com (optional)
HMD_GITLAB_CLIENTID no example GitLab API client id
HMD_GITLAB_CLIENTSECRET no example GitLab API client secret
HMD_MATTERMOST_BASEURL no example Mattermost authentication endpoint
HMD_MATTERMOST_CLIENTID no example Mattermost API client id
HMD_MATTERMOST_CLIENTSECRET no example Mattermost API client secret
HMD_DROPBOX_CLIENTID no example Dropbox API client id
HMD_DROPBOX_CLIENTSECRET no example Dropbox API client secret
HMD_GOOGLE_CLIENTID no example Google API client id
HMD_GOOGLE_CLIENTSECRET no example Google API client secret
HMD_LDAP_URL ldap://example.com URL of LDAP server
HMD_LDAP_BINDDN no example bindDn for LDAP access
HMD_LDAP_BINDCREDENTIALS no example bindCredentials for LDAP access
HMD_LDAP_SEARCHBASE o=users,dc=example,dc=com LDAP directory to begin search from
HMD_LDAP_SEARCHFILTER (uid={{username}}) LDAP filter to search with
HMD_LDAP_SEARCHATTRIBUTES displayName, mail LDAP attributes to search with (use comma to separate)
HMD_LDAP_USERIDFIELD uidNumber or uid or sAMAccountName The LDAP field which is used uniquely identify a user on HackMD
HMD_LDAP_USERNAMEFIELD Fallback to userid The LDAP field which is used as the username on HackMD
HMD_LDAP_TLS_CA server-cert.pem, root.pem Root CA for LDAP TLS in PEM format (use comma to separate)
HMD_LDAP_PROVIDERNAME My institution Optional name to be displayed at login form indicating the LDAP provider
HMD_SAML_IDPSSOURL https://idp.example.com/sso authentication endpoint of IdP. for details, see guide.
HMD_SAML_IDPCERT /path/to/cert.pem certificate file path of IdP in PEM format
HMD_SAML_ISSUER no example identity of the service provider (optional, default: serverurl)"
HMD_SAML_IDENTIFIERFORMAT no example name identifier format (optional, default: urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress)
HMD_SAML_GROUPATTRIBUTE memberOf attribute name for group list (optional)
HMD_SAML_REQUIREDGROUPS Hackmd-users group names that allowed (use vertical bar to separate) (optional)
HMD_SAML_EXTERNALGROUPS Temporary-staff group names that not allowed (use vertical bar to separate) (optional)
HMD_SAML_ATTRIBUTE_ID sAMAccountName attribute map for id (optional, default: NameID of SAML response)
HMD_SAML_ATTRIBUTE_USERNAME mailNickname attribute map for username (optional, default: NameID of SAML response)
HMD_SAML_ATTRIBUTE_EMAIL mail attribute map for email (optional, default: NameID of SAML response if HMD_SAML_IDENTIFIERFORMAT is default)
HMD_IMGUR_CLIENTID no example Imgur API client id
HMD_EMAIL true or false set to allow email signin
HMD_ALLOW_PDF_EXPORT true or false Enable or disable PDF exports
HMD_ALLOW_EMAIL_REGISTER true or false set to allow email register (only applied when email is set, default is true. Note bin/manage_users might help you if registration is false.)
HMD_IMAGE_UPLOAD_TYPE imgur, s3, minio or filesystem Where to upload image. For S3, see our Image Upload Guides for S3 or Minio
HMD_S3_ACCESS_KEY_ID no example AWS access key id
HMD_S3_SECRET_ACCESS_KEY no example AWS secret key
HMD_S3_REGION ap-northeast-1 AWS S3 region
HMD_S3_BUCKET no example AWS S3 bucket name
HMD_MINIO_ACCESS_KEY no example Minio access key
HMD_MINIO_SECRET_KEY no example Minio secret key
HMD_MINIO_ENDPOINT minio.example.org Address of your Minio endpoint/instance
HMD_MINIO_PORT 9000 Port that is used for your Minio instance
HMD_MINIO_SECURE true If set to true HTTPS is used for Minio
HMD_HSTS_ENABLE true set to enable HSTS if HTTPS is also enabled (default is true)
HMD_HSTS_INCLUDE_SUBDOMAINS true set to include subdomains in HSTS (default is true)
HMD_HSTS_MAX_AGE 31536000 max duration in seconds to tell clients to keep HSTS status (default is a year)
HMD_HSTS_PRELOAD true whether to allow preloading of the site's HSTS status (e.g. into browsers)
HMD_CSP_ENABLE true whether to enable Content Security Policy (directives cannot be configured with environment variables)
HMD_CSP_REPORTURI https://<someid>.report-uri.com/r/d/csp/enforce Allows to add a URL for CSP reports in case of violations

Application settings config.json

variables example values description
debug true or false set debug mode, show more logs
domain localhost domain name
urlPath hackmd sub URL path, like www.example.com/<urlpath>
port 80 web app port
allowOrigin ['localhost'] domain name whitelist
useSSL true or false set to use SSL server (if true, will auto turn on protocolUseSSL)
hsts {"enable": true, "maxAgeSeconds": 31536000, "includeSubdomains": true, "preload": true} HSTS options to use with HTTPS (default is the example value, max age is a year)
csp {"enable": true, "directives": {"scriptSrc": "trustworthy-scripts.example.com"}, "upgradeInsecureRequests": "auto", "addDefaults": true} Configures Content Security Policy. Directives are passed to Helmet - see their documentation for more information on the format. Some defaults are added to the configured values so that the application doesn't break. To disable this behaviour, set addDefaults to false. Further, if usecdn is on, some CDN locations are allowed too. By default (auto), insecure (HTTP) requests are upgraded to HTTPS via CSP if useSSL is on. To change this behaviour, set upgradeInsecureRequests to either true or false.
protocolUseSSL true or false set to use SSL protocol for resources path (only applied when domain is set)
urlAddPort true or false set to add port on callback URL (ports 80 or 443 won't be applied) (only applied when domain is set)
useCDN true or false set to use CDN resources or not (default is true)
allowAnonymous true or false set to allow anonymous usage (default is true)
allowAnonymousEdits true or false if allowAnonymous is true: allow users to select freely permission, allowing guests to edit existing notes (default is false)
allowFreeURL true or false set to allow new note creation by accessing a nonexistent note URL
defaultPermission freely, editable, limited, locked, protected or private set notes default permission (only applied on signed users)
dbURL mysql://localhost:3306/database set the db URL; if set, then db config (below) won't be applied
db { "dialect": "sqlite", "storage": "./db.hackmd.sqlite" } set the db configs, see more here
sslKeyPath ./cert/client.key SSL key path (only need when you set useSSL)
sslCertPath ./cert/hackmd_io.crt SSL cert path (only need when you set useSSL)
sslCAPath ['./cert/COMODORSAAddTrustCA.crt'] SSL ca chain (only need when you set useSSL)
dhParamPath ./cert/dhparam.pem SSL dhparam path (only need when you set useSSL)
tmpPath ./tmp/ temp directory path
defaultNotePath ./public/default.md default note file path
docsPath ./public/docs docs directory path
indexPath ./public/views/index.ejs index template file path
hackmdPath ./public/views/hackmd.ejs hackmd template file path
errorPath ./public/views/error.ejs error template file path
prettyPath ./public/views/pretty.ejs pretty template file path
slidePath ./public/views/slide.hbs slide template file path
sessionName connect.sid cookie session name
sessionSecret secret cookie session secret
sessionLife 14 * 24 * 60 * 60 * 1000 cookie session life
staticCacheTime 1 * 24 * 60 * 60 * 1000 static file cache time
heartbeatInterval 5000 socket.io heartbeat interval
heartbeatTimeout 10000 socket.io heartbeat timeout
documentMaxLength 100000 note max length
email true or false set to allow email signin
allowEmailRegister true or false set to allow email register (only applied when email is set, default is true. Note bin/manage_users might help you if registration is false.)
imageUploadType imgur(default), s3, minio or filesystem Where to upload image
minio { "accessKey": "YOUR_MINIO_ACCESS_KEY", "secretKey": "YOUR_MINIO_SECRET_KEY", "endpoint": "YOUR_MINIO_HOST", port: 9000, secure: true } When imageUploadType is set to minio, you need to set this key. Also checkout our Minio Image Upload Guide
s3 { "accessKeyId": "YOUR_S3_ACCESS_KEY_ID", "secretAccessKey": "YOUR_S3_ACCESS_KEY", "region": "YOUR_S3_REGION" } When imageuploadtype be set to s3, you would also need to setup this key, check our S3 Image Upload Guide
s3bucket YOUR_S3_BUCKET_NAME bucket name when imageUploadType is set to s3 or minio

Third-party integration API key settings

service settings location description
facebook, twitter, github, gitlab, mattermost, dropbox, google, ldap, saml environment variables or config.json for signin
imgur, s3, minio environment variables or config.json for image upload
dropbox(dropbox/appKey) config.json for export and import

Third-party integration OAuth callback URLs

service callback URL (after the server URL)
facebook /auth/facebook/callback
twitter /auth/twitter/callback
github /auth/github/callback
gitlab /auth/gitlab/callback
mattermost /auth/mattermost/callback
dropbox /auth/dropbox/callback
google /auth/google/callback
saml /auth/saml/callback

Developer Notes

Structure

hackmd/
├── tmp/            --- temporary files
├── docs/           --- document files
├── lib/            --- server libraries
└── public/         --- client files
    ├── css/        --- css styles
    ├── js/         --- js scripts
    ├── vendor/     --- vendor includes
    └── views/      --- view templates

Operational Transformation

From 0.3.2, we started supporting operational transformation. It makes concurrent editing safe and will not break up other users' operations. Additionally, now can show other clients' selections. See more at http://operational-transformation.github.io/

License

License under AGPL.