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rachmarirachmari
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normalize file names
1 parent c6cdf6c commit 20716ee

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-73
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‎server.rb‎

Lines changed: 44 additions & 29 deletions
Original file line numberDiff line numberDiff line change
@@ -1,27 +1,26 @@
11
require 'sinatra'
22
require 'octokit'
3-
require 'dotenv/load' # Manages environment variables
43
require 'json'
5-
require 'openssl' # Verifies the webhook signature
6-
require 'jwt' # Authenticates a GitHub App
7-
require 'time' # Gets ISO 8601 representation of a Time object
8-
require 'logger' # Logs debug statements
4+
require 'openssl' # Used to verify the webhook signature
5+
require 'jwt' # Used to authenticate a GitHub App
6+
require 'time' # Used to get ISO 8601 representation of a Time object
7+
require 'logger'
98

109
set :port, 3000
11-
set :bind, '0.0.0.0'
1210

1311

1412
# This is template code to create a GitHub App server.
1513
# You can read more about GitHub Apps here: # https://developer.github.com/apps/
1614
#
1715
# On its own, this app does absolutely nothing, except that it can be installed.
18-
# It's up to you to add functionality!
16+
# It's up to you to add fun functionality!
1917
# You can check out one example in advanced_server.rb.
2018
#
2119
# This code is a Sinatra app, for two reasons:
2220
# 1. Because the app will require a landing page for installation.
2321
# 2. To easily handle webhook events.
2422
#
23+
#
2524
# Of course, not all apps need to receive and process events!
2625
# Feel free to rip out the event handling code if you don't need it.
2726
#
@@ -30,7 +29,16 @@
3029

3130
class GHAapp < Sinatra::Application
3231

33-
# Expects that the private key in PEM format. Converts the newlines
32+
# !!! DO NOT EVER USE HARD-CODED VALUES IN A REAL APP !!!
33+
# Instead, set and read app tokens or other secrets in your code
34+
# in a runtime source, like an environment variable like below
35+
36+
# Expects that the private key has been set as an environment variable in
37+
# PEM format using the following command to replace newlines with the
38+
# literal `\n`:
39+
# export GITHUB_PRIVATE_KEY=`awk '{printf "%s\\n", $0}' private-key.pem`
40+
#
41+
# Converts the newlines
3442
PRIVATE_KEY = OpenSSL::PKey::RSA.new(ENV['GITHUB_PRIVATE_KEY'].gsub('\n', "\n"))
3543

3644
# Your registered app must have a secret set. The secret is used to verify
@@ -51,26 +59,32 @@ class GHAapp < Sinatra::Application
5159
get_payload_request(request)
5260
verify_webhook_signature
5361
authenticate_app
54-
# Authenticate the app installation in order to run API operations
62+
# Authenticate each installation of the app in order to run API operations
5563
authenticate_installation(@payload)
5664
end
5765

5866

5967
post '/event_handler' do
6068

61-
# # # # # # # # # # # #
62-
# ADD YOUR CODE HERE #
63-
# # # # # # # # # # # #
69+
case request.env['HTTP_X_GITHUB_EVENT']
70+
when 'issues'
71+
if @payload['action'] === 'opened'
72+
handle_issue_opened_event(@payload)
73+
end
74+
end
6475

65-
200 # success status
76+
'ok' # You have to return _something_. ;)
6677
end
6778

6879

6980
helpers do
7081

71-
# # # # # # # # # # # # # # # # #
72-
# ADD YOUR HELPER METHODS HERE #
73-
# # # # # # # # # # # # # # # # #
82+
# When an issue is opened, add a label
83+
def handle_issue_opened_event(payload)
84+
repo = payload['repository']['full_name']
85+
issue_number = payload['issue']['number']
86+
@installation_client.add_labels_to_an_issue(repo, issue_number, ['needs-response'])
87+
end
7488

7589
# Saves the raw payload and converts the payload to JSON format
7690
def get_payload_request(request)
@@ -87,7 +101,7 @@ def get_payload_request(request)
87101
end
88102

89103
# Instantiate an Octokit client authenticated as a GitHub App.
90-
# GitHub App authentication requires that you construct a
104+
# GitHub App authentication equires that we construct a
91105
# JWT (https://jwt.io/introduction/) signed with the app's private key,
92106
# so GitHub can be sure that it came from the app an not altererd by
93107
# a malicious third party.
@@ -103,15 +117,15 @@ def authenticate_app
103117
iss: APP_IDENTIFIER
104118
}
105119

106-
# Cryptographically sign the JWT.
120+
# Cryptographically sign the JWT
107121
jwt = JWT.encode(payload, PRIVATE_KEY, 'RS256')
108122

109123
# Create the Octokit client, using the JWT as the auth token.
110124
@app_client ||= Octokit::Client.new(bearer_token: jwt)
111125
end
112126

113-
# Instantiate an Octokit client, authenticated as an installation of a
114-
# GitHub App, to run API operations.
127+
# Instantiate an Octokit client authenticated as an installation of a
128+
# GitHub App to run API operations.
115129
def authenticate_installation(payload)
116130
installation_id = payload['installation']['id']
117131
installation_token = @app_client.create_app_installation_access_token(installation_id)[:token]
@@ -121,14 +135,14 @@ def authenticate_installation(payload)
121135
# Check X-Hub-Signature to confirm that this webhook was generated by
122136
# GitHub, and not a malicious third party.
123137
#
124-
# GitHub uses the WEBHOOK_SECRET, registered to the GitHub App, to
125-
# create the hash signature sent in the `X-HUB-Signature` header of each
126-
# webhook. This code computes the expected hash signature and compares it to
127-
# the signature sent in the `X-HUB-Signature` header. If they don't match,
128-
# this request is an attack, and you should reject it. GitHub uses the HMAC
129-
# hexdigest to compute the signature. The `X-HUB-Signature` looks something
130-
# like this: "sha1=123456".
131-
# See https://developer.github.com/webhooks/securing/ for details.
138+
# GitHub will the WEBHOOK_SECRET, registered
139+
# to the GitHub App, to create a hash signature sent in each webhook payload
140+
# in the `X-HUB-Signature` header. This code computes the expected hash
141+
# signature and compares it to the signature sent in the `X-HUB-Signature`
142+
# header. If they don't match, this request is an attack, and we should
143+
# reject it. GitHub uses the HMAC hexdigest to compute the signature. The
144+
# `X-HUB-Signature` looks something like this: "sha1=123456"
145+
# See https://developer.github.com/webhooks/securing/ for details
132146
def verify_webhook_signature
133147
their_signature_header = request.env['HTTP_X_HUB_SIGNATURE'] || 'sha1='
134148
method, their_digest = their_signature_header.split('=')
@@ -143,8 +157,9 @@ def verify_webhook_signature
143157

144158
end
145159

160+
146161
# Finally some logic to let us run this server directly from the commandline, or with Rack
147-
# Don't worry too much about this code. But, for the curious:
162+
# Don't worry too much about this code ;) But, for the curious:
148163
# $0 is the executed file
149164
# __FILE__ is the current file
150165
# If they are the same—that is, we are running this file directly, call the Sinatra run method

‎advanced_server.rb‎ renamed to ‎template_server.rb‎

Lines changed: 29 additions & 44 deletions
Original file line numberDiff line numberDiff line change
@@ -1,26 +1,27 @@
11
require 'sinatra'
22
require 'octokit'
3+
require 'dotenv/load' # Manages environment variables
34
require 'json'
4-
require 'openssl' # Used to verify the webhook signature
5-
require 'jwt' # Used to authenticate a GitHub App
6-
require 'time' # Used to get ISO 8601 representation of a Time object
7-
require 'logger'
5+
require 'openssl' # Verifies the webhook signature
6+
require 'jwt' # Authenticates a GitHub App
7+
require 'time' # Gets ISO 8601 representation of a Time object
8+
require 'logger' # Logs debug statements
89

910
set :port, 3000
11+
set :bind, '0.0.0.0'
1012

1113

1214
# This is template code to create a GitHub App server.
1315
# You can read more about GitHub Apps here: # https://developer.github.com/apps/
1416
#
1517
# On its own, this app does absolutely nothing, except that it can be installed.
16-
# It's up to you to add fun functionality!
18+
# It's up to you to add functionality!
1719
# You can check out one example in advanced_server.rb.
1820
#
1921
# This code is a Sinatra app, for two reasons:
2022
# 1. Because the app will require a landing page for installation.
2123
# 2. To easily handle webhook events.
2224
#
23-
#
2425
# Of course, not all apps need to receive and process events!
2526
# Feel free to rip out the event handling code if you don't need it.
2627
#
@@ -29,16 +30,7 @@
2930

3031
class GHAapp < Sinatra::Application
3132

32-
# !!! DO NOT EVER USE HARD-CODED VALUES IN A REAL APP !!!
33-
# Instead, set and read app tokens or other secrets in your code
34-
# in a runtime source, like an environment variable like below
35-
36-
# Expects that the private key has been set as an environment variable in
37-
# PEM format using the following command to replace newlines with the
38-
# literal `\n`:
39-
# export GITHUB_PRIVATE_KEY=`awk '{printf "%s\\n", $0}' private-key.pem`
40-
#
41-
# Converts the newlines
33+
# Expects that the private key in PEM format. Converts the newlines
4234
PRIVATE_KEY = OpenSSL::PKey::RSA.new(ENV['GITHUB_PRIVATE_KEY'].gsub('\n', "\n"))
4335

4436
# Your registered app must have a secret set. The secret is used to verify
@@ -59,32 +51,26 @@ class GHAapp < Sinatra::Application
5951
get_payload_request(request)
6052
verify_webhook_signature
6153
authenticate_app
62-
# Authenticate each installation of the app in order to run API operations
54+
# Authenticate the app installation in order to run API operations
6355
authenticate_installation(@payload)
6456
end
6557

6658

6759
post '/event_handler' do
6860

69-
case request.env['HTTP_X_GITHUB_EVENT']
70-
when 'issues'
71-
if @payload['action'] === 'opened'
72-
handle_issue_opened_event(@payload)
73-
end
74-
end
61+
# # # # # # # # # # # #
62+
# ADD YOUR CODE HERE #
63+
# # # # # # # # # # # #
7564

76-
'ok' # You have to return _something_. ;)
65+
200 # success status
7766
end
7867

7968

8069
helpers do
8170

82-
# When an issue is opened, add a label
83-
def handle_issue_opened_event(payload)
84-
repo = payload['repository']['full_name']
85-
issue_number = payload['issue']['number']
86-
@installation_client.add_labels_to_an_issue(repo, issue_number, ['needs-response'])
87-
end
71+
# # # # # # # # # # # # # # # # #
72+
# ADD YOUR HELPER METHODS HERE #
73+
# # # # # # # # # # # # # # # # #
8874

8975
# Saves the raw payload and converts the payload to JSON format
9076
def get_payload_request(request)
@@ -101,7 +87,7 @@ def get_payload_request(request)
10187
end
10288

10389
# Instantiate an Octokit client authenticated as a GitHub App.
104-
# GitHub App authentication equires that we construct a
90+
# GitHub App authentication requires that you construct a
10591
# JWT (https://jwt.io/introduction/) signed with the app's private key,
10692
# so GitHub can be sure that it came from the app an not altererd by
10793
# a malicious third party.
@@ -117,15 +103,15 @@ def authenticate_app
117103
iss: APP_IDENTIFIER
118104
}
119105

120-
# Cryptographically sign the JWT
106+
# Cryptographically sign the JWT.
121107
jwt = JWT.encode(payload, PRIVATE_KEY, 'RS256')
122108

123109
# Create the Octokit client, using the JWT as the auth token.
124110
@app_client ||= Octokit::Client.new(bearer_token: jwt)
125111
end
126112

127-
# Instantiate an Octokit client authenticated as an installation of a
128-
# GitHub App to run API operations.
113+
# Instantiate an Octokit client, authenticated as an installation of a
114+
# GitHub App, to run API operations.
129115
def authenticate_installation(payload)
130116
installation_id = payload['installation']['id']
131117
installation_token = @app_client.create_app_installation_access_token(installation_id)[:token]
@@ -135,14 +121,14 @@ def authenticate_installation(payload)
135121
# Check X-Hub-Signature to confirm that this webhook was generated by
136122
# GitHub, and not a malicious third party.
137123
#
138-
# GitHub will the WEBHOOK_SECRET, registered
139-
# to the GitHub App, to create a hash signature sent in each webhook payload
140-
# in the `X-HUB-Signature` header. This code computes the expected hash
141-
# signature and compares it to the signature sent in the `X-HUB-Signature`
142-
# header. If they don't match, this request is an attack, and we should
143-
# reject it. GitHub uses the HMAC hexdigest to compute the signature. The
144-
# `X-HUB-Signature` looks something like this: "sha1=123456"
145-
# See https://developer.github.com/webhooks/securing/ for details
124+
# GitHub uses the WEBHOOK_SECRET, registered to the GitHub App, to
125+
# create the hash signature sent in the `X-HUB-Signature` header of each
126+
# webhook. This code computes the expected hash signature and compares it to
127+
# the signature sent in the `X-HUB-Signature` header. If they don't match,
128+
# this request is an attack, and you should reject it. GitHub uses the HMAC
129+
# hexdigest to compute the signature. The `X-HUB-Signature` looks something
130+
# like this: "sha1=123456".
131+
# See https://developer.github.com/webhooks/securing/ for details.
146132
def verify_webhook_signature
147133
their_signature_header = request.env['HTTP_X_HUB_SIGNATURE'] || 'sha1='
148134
method, their_digest = their_signature_header.split('=')
@@ -157,9 +143,8 @@ def verify_webhook_signature
157143

158144
end
159145

160-
161146
# Finally some logic to let us run this server directly from the commandline, or with Rack
162-
# Don't worry too much about this code ;) But, for the curious:
147+
# Don't worry too much about this code. But, for the curious:
163148
# $0 is the executed file
164149
# __FILE__ is the current file
165150
# If they are the same—that is, we are running this file directly, call the Sinatra run method

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