Add full version string

Currently we only provide the version from `package.json`. This means
that during updates of instances, e.g. the demo instance, which runs
latest master instead of a stable release, changes are not reflected to
the webclient.

This patch adds a fullversion string that contains the current commit
and this way makes that clients are notified about changes.

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

9 files changed, 52 insertions, 7 deletions

diff --git a/README.md b/README.md
index 78c4fc78..5e49f2ed 100644
--- a/README.md
+++ b/README.md
@@ -260,6 +260,7 @@ There are some config settings you need to change in the files below.
 | `CMD_HSTS_PRELOAD` | `true` | whether to allow preloading of the site's HSTS status (e.g. into browsers) |
 | `CMD_CSP_ENABLE` | `true` | whether to enable Content Security Policy (directives cannot be configured with environment variables) |
 | `CMD_CSP_REPORTURI` | `https://<someid>.report-uri.com/r/d/csp/enforce` | Allows to add a URL for CSP reports in case of violations |
+| `CMD_SOURCE_URL` | `https://github.com/hackmdio/codimd/tree/<current commit>` | Provides the link to the source code of CodiMD on the entry page (Please, make sure you change this when you run a modified version) |
 
 ***Note:** Due to the rename process we renamed all `HMD_`-prefix variables to be `CMD_`-prefixed. The old ones continue to work.*
 
@@ -310,6 +311,7 @@ There are some config settings you need to change in the files below.
 | `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](docs/guides/minio-image-upload.md) |
 | `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](docs/guides/s3-image-upload.md) |
 | `s3bucket` | `YOUR_S3_BUCKET_NAME` | bucket name when `imageUploadType` is set to `s3` or `minio` |
+| `sourceURL` | `https://github.com/hackmdio/codimd/tree/<current commit>` | Provides the link to the source code of CodiMD on the entry page (Please, make sure you change this when you run a modified version) |
 
 <sup>1</sup>: relative paths are based on CodiMD's base directory
 
diff --git a/app.js b/app.js
index 622d866f..c2e958a6 100644
--- a/app.js
+++ b/app.js
@@ -178,6 +178,7 @@ app.set('view engine', 'ejs')
 // set generally available variables for all views
 app.locals.useCDN = config.useCDN
 app.locals.serverURL = config.serverURL
+app.locals.sourceURL = config.sourceURL
 app.locals.allowAnonymous = config.allowAnonymous
 app.locals.allowAnonymousEdits = config.allowAnonymousEdits
 app.locals.allowPDFExport = config.allowPDFExport
diff --git a/lib/config/environment.js b/lib/config/environment.js
index 6737637c..0c7c9a4f 100644
--- a/lib/config/environment.js
+++ b/lib/config/environment.js
@@ -3,6 +3,7 @@
 const {toBooleanConfig, toArrayConfig, toIntegerConfig} = require('./utils')
 
 module.exports = {
+  sourceURL: process.env.CMD_SOURCE_URL,
   domain: process.env.CMD_DOMAIN,
   urlPath: process.env.CMD_URL_PATH,
   host: process.env.CMD_HOST,
diff --git a/lib/config/index.js b/lib/config/index.js
index 501fdca3..4e1fa50d 100644
--- a/lib/config/index.js
+++ b/lib/config/index.js
@@ -8,6 +8,7 @@ const {merge} = require('lodash')
 const deepFreeze = require('deep-freeze')
 const {Environment, Permission} = require('./enum')
 const logger = require('../logger')
+const {getGitCommit, getGitHubURL} = require('./utils')
 
 const appRootPath = path.resolve(__dirname, '../../')
 const env = process.env.NODE_ENV || Environment.development
@@ -16,11 +17,17 @@ const debugConfig = {
 }
 
 // Get version string from package.json
-const {version} = require(path.join(appRootPath, 'package.json'))
+const {version, repository} = require(path.join(appRootPath, 'package.json'))
+
+const commitID = getGitCommit(appRootPath)
+const sourceURL = getGitHubURL(repository.url, commitID || version)
+const fullversion = commitID ? `${version}-${commitID}` : version
 
 const packageConfig = {
   version: version,
-  minimumCompatibleVersion: '0.5.0'
+  minimumCompatibleVersion: '0.5.0',
+  fullversion: fullversion,
+  sourceURL: sourceURL
 }
 
 const configFilePath = path.resolve(appRootPath, process.env.CMD_CONFIG_FILE ||
diff --git a/lib/config/utils.js b/lib/config/utils.js
index b2406cf1..dcc83638 100644
--- a/lib/config/utils.js
+++ b/lib/config/utils.js
@@ -1,5 +1,8 @@
 'use strict'
 
+const fs = require('fs')
+const path = require('path')
+
 exports.toBooleanConfig = function toBooleanConfig (configValue) {
   if (configValue && typeof configValue === 'string') {
     return (configValue === 'true')
@@ -20,3 +23,33 @@ exports.toIntegerConfig = function toIntegerConfig (configValue) {
   }
   return configValue
 }
+
+exports.getGitCommit = function getGitCommit (repodir) {
+  if (!fs.existsSync(repodir + '/.git/HEAD')) {
+    return undefined
+  }
+  let reference = fs.readFileSync(repodir + '/.git/HEAD', 'utf8')
+  if (reference.startsWith('ref: ')) {
+    reference = reference.substr(5).replace('\n', '')
+    reference = fs.readFileSync(path.resolve(repodir + '/.git', reference), 'utf8')
+  }
+  reference = reference.substr(5).replace('\n', '')
+  return reference
+}
+
+exports.getGitHubURL = function getGitHubURL (repo, reference) {
+  // if it's not a github reference, we handle handle that anyway
+  if (!repo.startsWith('https://github.com') && !repo.startsWith('git@github.com')) {
+    return repo
+  }
+  if (repo.startsWith('git@github.com') || repo.startsWith('ssh://git@github.com')) {
+    repo = repo.replace(/^(ssh:\/\/)?git@github.com:/, 'https://github.com/')
+  }
+
+  if (repo.endsWith('.git')) {
+    repo = repo.replace(/\.git$/, '/')
+  } else if (!repo.endsWith('/')) {
+    repo = repo + '/'
+  }
+  return repo + 'tree/' + reference
+}
diff --git a/lib/realtime.js b/lib/realtime.js
index f6c62d4e..8541bafa 100644
--- a/lib/realtime.js
+++ b/lib/realtime.js
@@ -887,7 +887,7 @@ function connection (socket) {
   // check version
   socket.on('version', function () {
     socket.emit('version', {
-      version: config.version,
+      version: config.fullversion,
       minimumCompatibleVersion: config.minimumCompatibleVersion
     })
   })
diff --git a/lib/web/statusRouter.js b/lib/web/statusRouter.js
index fb2609ea..2b9cb65f 100644
--- a/lib/web/statusRouter.js
+++ b/lib/web/statusRouter.js
@@ -96,7 +96,7 @@ statusRouter.get('/config', function (req, res) {
     domain: config.domain,
     urlpath: config.urlPath,
     debug: config.debug,
-    version: config.version,
+    version: config.fullversion,
     DROPBOX_APP_KEY: config.dropbox.appKey,
     allowedUploadMimeTypes: config.allowedUploadMimeTypes
   }
diff --git a/locales/en.json b/locales/en.json
index 100f4f54..ead7ce2f 100644
--- a/locales/en.json
+++ b/locales/en.json
@@ -112,5 +112,6 @@
 	"This will delete your account, all notes that are owned by you and remove all references to your account from other notes.": "This will delete your account, all notes that are owned by you and remove all references to your account from other notes.",
 	"Delete user": "Delete user",
 	"Export user data": "Export user data",
-	"Help us translating on %s": "Help us translating on %s"
-}
\ No newline at end of file
+	"Help us translating on %s": "Help us translating on %s",
+	"Source Code": "Source Code"
+}
diff --git a/public/views/index/body.ejs b/public/views/index/body.ejs
index 907cc1a8..43582d78 100644
--- a/public/views/index/body.ejs
+++ b/public/views/index/body.ejs
@@ -150,7 +150,7 @@
                         <option value="id">Bahasa Indonesia</option>
                     </select>
                     <p>
-                        Powered by <a href="https://codimd.org">CodiMD</a> | <a href="<%- serverURL %>/s/release-notes" target="_blank" rel="noopener"><%= __('Releases') %></a><% if(privacyStatement) { %> | <a href="<%- serverURL %>/s/privacy" target="_blank" rel="noopener"><%= __('Privacy') %></a><% } %><% if(termsOfUse) { %> | <a href="<%- serverURL %>/s/terms-of-use" target="_blank" rel="noopener"><%= __('Terms of Use') %></a><% } %>
+                        Powered by <a href="https://codimd.org">CodiMD</a> | <a href="<%- serverURL %>/s/release-notes" target="_blank" rel="noopener"><%= __('Releases') %></a>| <a href="<%- sourceURL %>" target="_blank" rel="noopener"><%= __('Source Code') %></a><% if(privacyStatement) { %> | <a href="<%- serverURL %>/s/privacy" target="_blank" rel="noopener"><%= __('Privacy') %></a><% } %><% if(termsOfUse) { %> | <a href="<%- serverURL %>/s/terms-of-use" target="_blank" rel="noopener"><%= __('Terms of Use') %></a><% } %>
                     </p>
                     <h6 class="social-foot">
                         <%- __('Follow us on %s and %s.', '<a href="https://github.com/hackmdio/CodiMD" target="_blank" rel="noopener"><i class="fa fa-github"></i> GitHub</a>, <a href="https://riot.im/app/#/room/#codimd:matrix.org" target="_blank" rel="noopener"><i class="fa fa-comments"></i> Riot</a>', '<a href="https://translate.codimd.org" target="_blank" rel="noopener"><i class="fa fa-globe"></i> POEditor</a>') %>