HackMD

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
• Installation
  • Getting started (Native install)
    • Prerequisite
    • Instructions
  • Heroku Deployment
  • HackMD by docker container
• Upgrade
  • Native setup
• Configuration
  • Environment variables (will overwrite other server configs)
  • Application settings config.json
  • Third-party integration api key settings
  • Third-party integration oauth callback urls
• Developer Notes
  • Structure
  • Operational Transformation
• License

Browsers Requirement

• Chrome >= 47, Chrome for Android >= 47
• Safari >= 9, iOS Safari >= 8.4
• Firefox >= 44
• IE >= 9, Edge >= 12
• 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)

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.

HackMD by docker container

Debian-based version:

Alpine-based version:

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!

• migration-to-0.5.0

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.

• migration-to-0.4.0

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 configs 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 (port 80 or 443 won't 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_FREEURL	true or false	set to allow new note by accessing not exist 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 db url
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_TOKENSECRET	supersecretkey	secret used for generating access/refresh tokens
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	no example	LDAP attributes to search with
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_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)
HMD_IMAGE_UPLOAD_TYPE	imgur, s3 or filesystem	Where to upload image. For S3, see our S3 Image Upload Guide
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_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)

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)
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 (port 80 or 443 won't 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)
allowfreeurl	true or false	set to allow new note by accessing not exist 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 this variable then below db config 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)
imageUploadType	imgur(default), s3 or filesystem	Where to upload image
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

Third-party integration api key settings

service	settings location	description
facebook, twitter, github, gitlab, mattermost, dropbox, google, ldap	environment variables or config.json	for signin
imgur, s3	environment variables or config.json	for image upload
google drive(google/apiKey, google/clientID), 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

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 MIT.