[init] finished this project

.gitignore

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+
+# Created by https://www.gitignore.io/api/node,macos,linux,serverless
+
+### Linux ###
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
+
+### macOS ###
+*.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+### Node ###
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Typescript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+
+### Serverless ###
+# Ignore build directory
+.serverless
+
+# End of https://www.gitignore.io/api/node,macos,linux,serverless
+bookmarklet.js
+secrets.yml

.npmignore

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+# package directories
+node_modules
+jspm_packages
+
+# Serverless directories
+.serverless

autotag.js

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+
+var _ = require('lodash');
+var validUrl = require('valid-url');
+var URL = require('url-parse');
+
+var default_sites = {
+	'github.com': 'Github',
+	'medium.com': 'Medium',
+	'reddit.com': 'Reddit',
+};
+
+var autoTag = (tags, url) => {
+	var result = '';
+	if (! _.isArray(tags)) throw 'tags not an array!';
+	if (validUrl.isUri(url) === undefined) throw 'URL is not valid!';
+
+	var parsed = URL(url);
+	var hostname = default_sites[parsed.hostname];
+	if (hostname !== undefined) {
+		tags.push(hostname);
+	}
+
+	if (tags.length > 0) {
+		result = toTagString(tags);
+	}
+
+	return result;
+}
+
+// tags is array of strings
+var toTagString = (tags) => {
+	if (! _.isArray(tags)) throw 'tags not an array!';
+
+	return ' #' + _.join(tags, ' #');
+}
+
+module.exports = autoTag;

handler.js

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+'use strict';
+
+var Botkit = require('botkit');
+var autotag = require('./autotag');
+var controller = Botkit.slackbot();
+
+module.exports.bookmark = (event, context, callback) => {
+  var response_body = {
+    success: false,
+  };
+
+  try {
+    var bot = controller.spawn({
+      token: process.env.SLACK_TOKEN
+    });
+    var req_body = JSON.parse(event.body);
+    if (!('tags' in req_body)) req_body.tags = [];
+    var tags = autotag(req_body.tags, req_body.url);
+    bot.say({
+      text: '@paperbot ' + req_body.url + tags,
+      channel: process.env.SLACK_BOOKMARK_CHANNEL
+    });
+
+    response_body.success = true;
+
+  } catch(e) {
+    console.log('An error has occured:');
+    console.log(e);
+    response_body.error = e;
+  }
+
+  var response = {
+    statusCode: 200,
+    headers: {
+      "Access-Control-Allow-Origin" : "*",
+      "Access-Control-Allow-Credentials" : true
+    },
+    body: JSON.stringify(response_body),
+  };
+
+  callback(null, response);
+};

package.json

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+{
+  "name": "serverless-slackbot",
+  "version": "1.0.0",
+  "description": "",
+  "main": "handler.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "Poyu Chen <p820316@gmail.com>",
+  "license": "ISC",
+  "dependencies": {
+    "botkit": "^0.5.1",
+    "lodash": "^4.17.4",
+    "url-parse": "^1.1.8",
+    "valid-url": "^1.0.9"
+  }
+}

secrets.example.yml

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+SLACK_TOKEN: YOUR_SLACK_KEY_HERE

serverless.yml

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+service: slackBot
+
+provider:
+  name: aws
+  runtime: nodejs4.3
+
+custom:
+  secrets: ${file(secrets.yml)}
+  dev: dev
+  prod: bookmarks
+
+functions:
+  bookmark:
+    handler: handler.bookmark
+    environment:
+      SLACK_TOKEN: ${self:custom.secrets.SLACK_TOKEN}
+      SLACK_BOOKMARK_CHANNEL: ${self:custom.${opt:stage, self:provider.stage}}
+    events:
+     - http: 
+        path: add
+        method: POST
+        cors: true