├── hooks └── .gitignore ├── requirements.txt ├── config.json.sample ├── Dockerfile ├── README.rst ├── webhooks.py └── LICENSE /hooks/.gitignore: -------------------------------------------------------------------------------- 1 | * 2 | !.gitignore 3 | -------------------------------------------------------------------------------- /requirements.txt: -------------------------------------------------------------------------------- 1 | Flask==0.12.2 2 | ipaddress==1.0.18 3 | requests==2.18.2 4 | -------------------------------------------------------------------------------- /config.json.sample: -------------------------------------------------------------------------------- 1 | { 2 | "github_ips_only": true, 3 | "enforce_secret": "", 4 | "return_scripts_info": true 5 | } -------------------------------------------------------------------------------- /Dockerfile: -------------------------------------------------------------------------------- 1 | FROM python:2.7-alpine 2 | MAINTAINER "Matjaž Finžgar" 3 | 4 | WORKDIR /app 5 | 6 | COPY requirements.txt /app 7 | RUN pip install -r requirements.txt 8 | 9 | COPY . /app 10 | 11 | EXPOSE 5000 12 | CMD ["python", "webhooks.py"] 13 | -------------------------------------------------------------------------------- /README.rst: -------------------------------------------------------------------------------- 1 | ====================== 2 | Python GitHub Webhooks 3 | ====================== 4 | 5 | Simple Python WSGI application to handle GitHub webhooks. 6 | 7 | 8 | Install 9 | ======= 10 | 11 | :: 12 | 13 | git clone https://github.com/carlos-jenkins/python-github-webhooks.git 14 | cd python-github-webhooks 15 | 16 | 17 | Dependencies 18 | ============ 19 | 20 | :: 21 | 22 | sudo pip install -r requirements.txt 23 | 24 | 25 | Setup 26 | ===== 27 | 28 | You can configure what the application does by copying the sample config file 29 | ``config.json.sample`` to ``config.json`` and adapting it to your needs: 30 | 31 | :: 32 | 33 | { 34 | "github_ips_only": true, 35 | "enforce_secret": "", 36 | "return_scripts_info": true, 37 | "hooks_path": "/.../hooks/" 38 | } 39 | 40 | :github_ips_only: Restrict application to be called only by GitHub IPs. IPs 41 | whitelist is obtained from 42 | `GitHub Meta `_ 43 | (`endpoint `_). Default: ``true``. 44 | :enforce_secret: Enforce body signature with HTTP header ``X-Hub-Signature``. 45 | See ``secret`` at 46 | `GitHub WebHooks Documentation `_. 47 | Default: ``''`` (do not enforce). 48 | :return_scripts_info: Return a JSON with the ``stdout``, ``stderr`` and exit 49 | code for each executed hook using the hook name as key. If this option is set 50 | you will be able to see the result of your hooks from within your GitHub 51 | hooks configuration page (see "Recent Deliveries"). 52 | Default: ``true``. 53 | :hooks_path: Configures a path to import the hooks. If not set, it'll import 54 | the hooks from the default location (/.../python-github-webhooks/hooks) 55 | 56 | 57 | Adding Hooks 58 | ============ 59 | 60 | This application will execute scripts in the hooks directory using the 61 | following order: 62 | 63 | :: 64 | 65 | hooks/{event}-{name}-{branch} 66 | hooks/{event}-{name} 67 | hooks/{event} 68 | hooks/all 69 | 70 | The application will pass to the hooks the path to a JSON file holding the 71 | payload for the request as first argument. The event type will be passed 72 | as second argument. For example: 73 | 74 | :: 75 | 76 | hooks/push-myrepo-master /tmp/sXFHji push 77 | 78 | Hooks can be written in any scripting language as long as the file is 79 | executable and has a shebang. A simple example in Python could be: 80 | 81 | :: 82 | 83 | #!/usr/bin/env python 84 | # Python Example for Python GitHub Webhooks 85 | # File: push-myrepo-master 86 | 87 | import sys 88 | import json 89 | 90 | with open(sys.argv[1], 'r') as jsf: 91 | payload = json.loads(jsf.read()) 92 | 93 | ### Do something with the payload 94 | name = payload['repository']['name'] 95 | outfile = '/tmp/hook-{}.log'.format(name) 96 | 97 | with open(outfile, 'w') as f: 98 | f.write(json.dumps(payload)) 99 | 100 | Not all events have an associated branch, so a branch-specific hook cannot 101 | fire for such events. For events that contain a pull_request object, the 102 | base branch (target for the pull request) is used, not the head branch. 103 | 104 | The payload structure depends on the event type. Please review: 105 | 106 | https://developer.github.com/v3/activity/events/types/ 107 | 108 | 109 | Deploy 110 | ====== 111 | 112 | Apache 113 | ------ 114 | 115 | To deploy in Apache, just add a ``WSGIScriptAlias`` directive to your 116 | VirtualHost file: 117 | 118 | :: 119 | 120 | 121 | ServerAdmin you@my.site.com 122 | ServerName my.site.com 123 | DocumentRoot /var/www/site.com/my/htdocs/ 124 | 125 | # Handle Github webhook 126 | 127 | Order deny,allow 128 | Allow from all 129 | 130 | WSGIScriptAlias /webhooks /var/www/site.com/my/python-github-webhooks/webhooks.py 131 | 132 | 133 | 134 | You can now register the hook in your Github repository settings: 135 | 136 | https://github.com/youruser/myrepo/settings/hooks 137 | 138 | To register the webhook select Content type: ``application/json`` and set the URL to the URL 139 | of your WSGI script: 140 | 141 | :: 142 | 143 | http://my.site.com/webhooks 144 | 145 | Docker 146 | ------ 147 | 148 | To deploy in a Docker container you have to expose the port 5000, for example 149 | with the following command: 150 | 151 | :: 152 | 153 | git clone http://github.com/carlos-jenkins/python-github-webhooks.git 154 | docker build -t carlos-jenkins/python-github-webhooks python-github-webhooks 155 | docker run -d --name webhooks -p 5000:5000 carlos-jenkins/python-github-webhooks 156 | 157 | You can also mount volume to setup the ``hooks/`` directory, and the file 158 | ``config.json``: 159 | 160 | :: 161 | 162 | docker run -d --name webhooks \ 163 | -v /path/to/my/hooks:/src/hooks \ 164 | -v /path/to/my/config.json:/src/config.json \ 165 | -p 5000:5000 python-github-webhooks 166 | 167 | 168 | Test your deployment 169 | ==================== 170 | 171 | To test your hook you may use the GitHub REST API with ``curl``: 172 | 173 | https://developer.github.com/v3/ 174 | 175 | :: 176 | 177 | curl --user "" https://api.github.com/repos///hooks 178 | 179 | Take note of the test_url. 180 | 181 | :: 182 | 183 | curl --user "" -i -X POST 184 | 185 | You should be able to see any log error in your webapp. 186 | 187 | 188 | Debug 189 | ===== 190 | 191 | When running in Apache, the ``stderr`` of the hooks that return non-zero will 192 | be logged in Apache's error logs. For example: 193 | 194 | :: 195 | 196 | sudo tail -f /var/log/apache2/error.log 197 | 198 | Will log errors in your scripts if printed to ``stderr``. 199 | 200 | You can also launch the Flask web server in debug mode at port ``5000``. 201 | 202 | :: 203 | 204 | python webhooks.py 205 | 206 | This can help debug problem with the WSGI application itself. 207 | 208 | 209 | License 210 | ======= 211 | 212 | :: 213 | 214 | Copyright (C) 2014-2015 Carlos Jenkins 215 | 216 | Licensed under the Apache License, Version 2.0 (the "License"); 217 | you may not use this file except in compliance with the License. 218 | You may obtain a copy of the License at 219 | 220 | http://www.apache.org/licenses/LICENSE-2.0 221 | 222 | Unless required by applicable law or agreed to in writing, 223 | software distributed under the License is distributed on an 224 | "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 225 | KIND, either express or implied. See the License for the 226 | specific language governing permissions and limitations 227 | under the License. 228 | 229 | 230 | Credits 231 | ======= 232 | 233 | This project is just the reinterpretation and merge of two approaches: 234 | 235 | - `github-webhook-wrapper `_. 236 | - `flask-github-webhook `_. 237 | 238 | Thanks. 239 | -------------------------------------------------------------------------------- /webhooks.py: -------------------------------------------------------------------------------- 1 | # -*- coding: utf-8 -*- 2 | # 3 | # Copyright (C) 2014, 2015, 2016 Carlos Jenkins 4 | # 5 | # Licensed under the Apache License, Version 2.0 (the "License"); 6 | # you may not use this file except in compliance with the License. 7 | # You may obtain a copy of the License at 8 | # 9 | # http://www.apache.org/licenses/LICENSE-2.0 10 | # 11 | # Unless required by applicable law or agreed to in writing, 12 | # software distributed under the License is distributed on an 13 | # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 14 | # KIND, either express or implied. See the License for the 15 | # specific language governing permissions and limitations 16 | # under the License. 17 | 18 | import logging 19 | from sys import stderr, hexversion 20 | logging.basicConfig(stream=stderr) 21 | 22 | import hmac 23 | from hashlib import sha1 24 | from json import loads, dumps 25 | from subprocess import Popen, PIPE 26 | from tempfile import mkstemp 27 | from os import access, X_OK, remove, fdopen 28 | from os.path import isfile, abspath, normpath, dirname, join, basename 29 | 30 | import requests 31 | from ipaddress import ip_address, ip_network 32 | from flask import Flask, request, abort 33 | 34 | 35 | application = Flask(__name__) 36 | 37 | 38 | @application.route('/', methods=['GET', 'POST']) 39 | def index(): 40 | """ 41 | Main WSGI application entry. 42 | """ 43 | 44 | path = normpath(abspath(dirname(__file__))) 45 | 46 | # Only POST is implemented 47 | if request.method != 'POST': 48 | abort(501) 49 | 50 | # Load config 51 | with open(join(path, 'config.json'), 'r') as cfg: 52 | config = loads(cfg.read()) 53 | 54 | hooks = config.get('hooks_path', join(path, 'hooks')) 55 | 56 | # Allow Github IPs only 57 | if config.get('github_ips_only', True): 58 | src_ip = ip_address( 59 | u'{}'.format(request.access_route[0]) # Fix stupid ipaddress issue 60 | ) 61 | whitelist = requests.get('https://api.github.com/meta').json()['hooks'] 62 | 63 | for valid_ip in whitelist: 64 | if src_ip in ip_network(valid_ip): 65 | break 66 | else: 67 | logging.error('IP {} not allowed'.format( 68 | src_ip 69 | )) 70 | abort(403) 71 | 72 | # Enforce secret 73 | secret = config.get('enforce_secret', '') 74 | if secret: 75 | # Only SHA1 is supported 76 | header_signature = request.headers.get('X-Hub-Signature') 77 | if header_signature is None: 78 | abort(403) 79 | 80 | sha_name, signature = header_signature.split('=') 81 | if sha_name != 'sha1': 82 | abort(501) 83 | 84 | # HMAC requires the key to be bytes, but data is string 85 | mac = hmac.new(str(secret), msg=request.data, digestmod='sha1') 86 | 87 | # Python prior to 2.7.7 does not have hmac.compare_digest 88 | if hexversion >= 0x020707F0: 89 | if not hmac.compare_digest(str(mac.hexdigest()), str(signature)): 90 | abort(403) 91 | else: 92 | # What compare_digest provides is protection against timing 93 | # attacks; we can live without this protection for a web-based 94 | # application 95 | if not str(mac.hexdigest()) == str(signature): 96 | abort(403) 97 | 98 | # Implement ping 99 | event = request.headers.get('X-GitHub-Event', 'ping') 100 | if event == 'ping': 101 | return dumps({'msg': 'pong'}) 102 | 103 | # Gather data 104 | try: 105 | payload = request.get_json() 106 | except Exception: 107 | logging.warning('Request parsing failed') 108 | abort(400) 109 | 110 | # Determining the branch is tricky, as it only appears for certain event 111 | # types an at different levels 112 | branch = None 113 | try: 114 | # Case 1: a ref_type indicates the type of ref. 115 | # This true for create and delete events. 116 | if 'ref_type' in payload: 117 | if payload['ref_type'] == 'branch': 118 | branch = payload['ref'] 119 | 120 | # Case 2: a pull_request object is involved. This is pull_request and 121 | # pull_request_review_comment events. 122 | elif 'pull_request' in payload: 123 | # This is the TARGET branch for the pull-request, not the source 124 | # branch 125 | branch = payload['pull_request']['base']['ref'] 126 | 127 | elif event in ['push']: 128 | # Push events provide a full Git ref in 'ref' and not a 'ref_type'. 129 | branch = payload['ref'].split('/', 2)[2] 130 | 131 | except KeyError: 132 | # If the payload structure isn't what we expect, we'll live without 133 | # the branch name 134 | pass 135 | 136 | # All current events have a repository, but some legacy events do not, 137 | # so let's be safe 138 | name = payload['repository']['name'] if 'repository' in payload else None 139 | 140 | meta = { 141 | 'name': name, 142 | 'branch': branch, 143 | 'event': event 144 | } 145 | logging.info('Metadata:\n{}'.format(dumps(meta))) 146 | 147 | # Skip push-delete 148 | if event == 'push' and payload['deleted']: 149 | logging.info('Skipping push-delete event for {}'.format(dumps(meta))) 150 | return dumps({'status': 'skipped'}) 151 | 152 | # Possible hooks 153 | scripts = [] 154 | if branch and name: 155 | scripts.append(join(hooks, '{event}-{name}-{branch}'.format(**meta))) 156 | if name: 157 | scripts.append(join(hooks, '{event}-{name}'.format(**meta))) 158 | scripts.append(join(hooks, '{event}'.format(**meta))) 159 | scripts.append(join(hooks, 'all')) 160 | 161 | # Check permissions 162 | scripts = [s for s in scripts if isfile(s) and access(s, X_OK)] 163 | if not scripts: 164 | return dumps({'status': 'nop'}) 165 | 166 | # Save payload to temporal file 167 | osfd, tmpfile = mkstemp() 168 | with fdopen(osfd, 'w') as pf: 169 | pf.write(dumps(payload)) 170 | 171 | # Run scripts 172 | ran = {} 173 | for s in scripts: 174 | 175 | proc = Popen( 176 | [s, tmpfile, event], 177 | stdout=PIPE, stderr=PIPE 178 | ) 179 | stdout, stderr = proc.communicate() 180 | 181 | ran[basename(s)] = { 182 | 'returncode': proc.returncode, 183 | 'stdout': stdout.decode('utf-8'), 184 | 'stderr': stderr.decode('utf-8'), 185 | } 186 | 187 | # Log errors if a hook failed 188 | if proc.returncode != 0: 189 | logging.error('{} : {} \n{}'.format( 190 | s, proc.returncode, stderr 191 | )) 192 | 193 | # Remove temporal file 194 | remove(tmpfile) 195 | 196 | info = config.get('return_scripts_info', False) 197 | if not info: 198 | return dumps({'status': 'done'}) 199 | 200 | output = dumps(ran, sort_keys=True, indent=4) 201 | logging.info(output) 202 | return output 203 | 204 | 205 | if __name__ == '__main__': 206 | application.run(debug=True, host='0.0.0.0') 207 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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