├── Procfile
├── requirements.txt
├── templates
└── index.html
├── Makefile
├── app.py
├── README.md
└── LICENSE
/Procfile:
--------------------------------------------------------------------------------
1 | web: gunicorn -w 4 -b 0.0.0.0:$PORT -k gevent app:app --log-level debug
2 |
--------------------------------------------------------------------------------
/requirements.txt:
--------------------------------------------------------------------------------
1 | # ----------------------
2 | # Flask
3 | # ----------------------
4 | flask
5 | requests
6 |
7 | # ----------------------
8 | # Testing
9 | # ----------------------
10 | mock
11 |
12 |
13 | # ----------------------
14 | # Production Server
15 | # ----------------------
16 | gevent
17 | gunicorn
18 |
--------------------------------------------------------------------------------
/templates/index.html:
--------------------------------------------------------------------------------
1 |
2 |
3 | cors.io
4 |
9 |
10 |
11 |
12 | The Problem:
13 | No 'Access-Control-Allow-Origin' header is present on the requested resource.
14 |
Origin 'http://internet.derp' is therefore not allowed access.
15 |
16 | The Solution:
17 | A CORS proxy!
18 |
19 |
20 | $.getJSON('https://httpbin.org/get?cors=a_problem',function(){})
21 |
22 | becomes ..
23 |
24 | $.getJSON('https://corsio.devops.codeforafrica.org/?https://httpbin.org/get?cors=a_problem',function(){})
25 |
26 |
27 |
28 | $.post('https://httpbin.org/post',data,function(){})
29 |
30 | becomes ..
31 |
32 | $.post('https://corsio.devops.codeforafrica.org/?https://httpbin.org/post',data,function(){})
33 |
34 | send hatemail to @deanpierce
35 | Annoyed by constant downtime? Check out [these] instructions to set up your own free cors proxy!
36 | contributors: @nizarmah_
37 |
38 |
hmm
39 |
40 |
41 |
42 |
--------------------------------------------------------------------------------
/Makefile:
--------------------------------------------------------------------------------
1 | # A simple way to update Flask Heroku's static files.
2 |
3 | # ----------------------
4 | # Useful variables
5 | # ----------------------
6 | NORM=\033[0m
7 | BOLD=\033[1m
8 | CHECK=\033[32m✔\033[39m
9 | port=5000
10 |
11 |
12 | # ----------------------
13 | # Default build
14 | # ----------------------
15 | build:
16 | @echo "\n⚡ ${BOLD}This might take a minute${NORM} ⚡\n"
17 | @make clone
18 | @make update
19 | @make js
20 | @rm -rf {bootstrap,update}
21 | @echo "\n⚡ ${BOLD}Successfully updated${NORM} ⚡\n"
22 |
23 |
24 | # ----------------------
25 | # Clone Bootstrap && Make
26 | # ----------------------
27 | clone:
28 | @git clone git://github.com/twitter/bootstrap.git
29 | @echo "\n${BOLD}Clone Twitter Bootstrap... ${NORM}${CHECK}\n"
30 | @cd bootstrap; make bootstrap
31 | @cd bootstrap; cp -R less bootstrap/css/less
32 | @cd bootstrap; mv bootstrap ../update
33 |
34 |
35 | # ----------------------
36 | # External JavaScript
37 | # ----------------------
38 | js:
39 | @curl http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js > static/js/jquery.js
40 | @echo "\n${BOLD}Grab latest jQuery... ${NORM}${CHECK}\n"
41 | @curl -L http://git.io/less-1.3.0 > static/js/less.js
42 | @echo "\n${BOLD}Grab latest LESS.js... ${NORM}${CHECK}\n"
43 | @curl http://modernizr.com/downloads/modernizr-2.5.3.js > static/js/modernizr.js
44 | @echo "\n${BOLD}Grab latest Modernizr... ${NORM}${CHECK}\n"
45 |
46 |
47 | # ----------------------
48 | # Update commands
49 | # ----------------------
50 | update:
51 | @rm -rf static/css/less
52 | @mv update/css/* static/css
53 | @mv update/img/* static/img
54 | @mv update/js/* static/js
55 | @echo "\n${BOLD}Update static files... ${NORM}${CHECK}\n"
56 |
--------------------------------------------------------------------------------
/app.py:
--------------------------------------------------------------------------------
1 | from flask import render_template
2 | from flask import request
3 |
4 | import time
5 | import flask
6 | from flask import Flask
7 | app = Flask(__name__)
8 |
9 | import requests
10 |
11 | @app.route('/', methods=("GET", "POST", "OPTIONS"))
12 | def index():
13 | qs=request.query_string
14 |
15 | if qs:
16 | try:
17 | qs = qs.decode('utf8')
18 |
19 | agent = request.headers.get('User-Agent')
20 | oauth = request.headers.get('Authorization')
21 | ctype = request.headers.get('Content-Type')
22 |
23 | headers = {}
24 | if agent is not None:
25 | headers['User-Agent'] = agent;
26 | if oauth is not None:
27 | headers['Authorization'] = oauth;
28 |
29 | if request.method == "POST":
30 | user_data = {}
31 |
32 | if 'application/json' in ctype:
33 | user_data = request.data
34 | else:
35 | user_data = request.form.to_dict()
36 |
37 | if 'multipart/form-data' in ctype:
38 | user_files = request.files.to_dict()
39 |
40 | r = requests.post(qs, headers = headers, data = user_data, files = user_files)
41 | else:
42 | r = requests.post(qs, headers = headers, data = user_data)
43 | elif request.method == "GET":
44 | r = requests.get(qs, headers = headers)
45 | elif request.method == "OPTIONS":
46 | '''
47 | OPTIONS has recently been used before POST in some libraries
48 | but not all websites have an OPTIONS http method; therefore,
49 | we provide a request to ourself in order to return
50 | the correct headers with correct response code and data
51 | '''
52 | r = requests.options(request.base_url, headers = headers)
53 |
54 | rt = r.text
55 | except:
56 | return "nope"
57 |
58 | response = flask.Response(rt)
59 | status_code = r.status_code
60 |
61 | '''
62 | we don't really care if the requests.options above
63 | returns an OK request or not, we just care about
64 | passing a new response with new headers, and a valid status code
65 | '''
66 | if request.method == "OPTIONS":
67 | status_code = 200
68 |
69 | response.headers['Access-Control-Allow-Origin'] = '*'
70 |
71 | # ensure that data getting passed back is plain text
72 | response.headers['Content-Type'] = "text/plain"
73 |
74 | '''
75 | preflight CORS policy response headers
76 | - Returns Allowed Methods:
77 | In our case, GET and POST are the only ones allowed
78 | - Returns Allowed Headers:
79 | In our case, it is the headers that the user requested to use
80 | so, the ones in Access-Control-Request-Headers
81 | '''
82 | response.headers['Access-Control-Allow-Methods'] = 'GET, POST, OPTIONS'
83 | response.headers['Access-Control-Allow-Headers'] = request.headers.get('Access-Control-Request-Headers')
84 |
85 | return response, status_code
86 | else:
87 | print("nope")
88 |
89 | return render_template('index.html')
90 |
91 |
--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # cors.io
2 | a simple cors proxy
3 |
4 | Now fully flaskified, and ready for deployment on heroku.
5 |
6 | ## Table of Contents
7 |
8 | - [Supported HTTP Methods](#Supported-HTTP-Methods)
9 | * [GET Request](#GET-Request)
10 | * [POST Request](#POST-Request)
11 | * [OPTIONS Request](#OPTIONS-Request)
12 | - [Deploying on Heroku](#Deploying-on-Heroku)
13 |
14 | ## Supported HTTP Methods
15 |
16 | ### GET Request
17 | ```javascript
18 | $.getJSON('http://cors.io/?' +
19 | 'https://httpbin.org/get?cors=a_problem',
20 | function (res) {
21 | console.log(res);
22 | });
23 | ```
24 | ```json
25 | {
26 | "args": {
27 | "cors": "a_problem"
28 | },
29 | "headers": {
30 | "Accept": "*/*",
31 | "Accept-Encoding": "gzip, deflate",
32 | "Host": "httpbin.org",
33 | "User-Agent": ""
34 | },
35 | "origin": "",
36 | "url": "https://httpbin.org/get?cors=a_problem"
37 | }
38 | ```
39 |
40 | ### POST Request
41 |
42 | #### application/json
43 |
44 | ```javascript
45 | $.ajax({
46 | method: "POST",
47 | url: 'https://cors.io/?' +
48 | 'https://httpbin.org/post',
49 | headers: {
50 | 'Content-Type': 'application/json'
51 | },
52 | data: JSON.stringify({
53 | "cors": "a_problem"
54 | }),
55 | success: (res) => console.log(res)
56 | });
57 | ```
58 | ```json
59 | {
60 | "args": {},
61 | "data": "{\"cors\":\"a_problem\"}",
62 | "files": {},
63 | "form": {},
64 | "headers": {
65 | "Accept": "*/*",
66 | "Accept-Encoding": "gzip, deflate",
67 | "Content-Length": "20",
68 | "Host": "httpbin.org",
69 | "User-Agent": ""
70 | },
71 | "json": {
72 | "cors": "a_problem"
73 | },
74 | "origin": "",
75 | "url": "https://httpbin.org/post"
76 | }
77 | ```
78 |
79 | #### application/x-www-form-urlencoded
80 |
81 | ```javascript
82 | $.ajax({
83 | method: "POST",
84 | url: 'https://cors.io/?' +
85 | 'https://httpbin.org/post',
86 | headers: {
87 | 'Content-Type': 'application/x-www-form-urlencoded'
88 | },
89 | data: "cors=a_problem",
90 | success: (res) => console.log(res)
91 | });
92 | ```
93 | ```json
94 | {
95 | "args": {},
96 | "data": "",
97 | "files": {},
98 | "form": {
99 | "cors": "a_problem"
100 | },
101 | "headers": {
102 | "Accept": "*/*",
103 | "Accept-Encoding": "gzip, deflate",
104 | "Content-Length": "14",
105 | "Content-Type": "application/x-www-form-urlencoded",
106 | "Host": "httpbin.org",
107 | "User-Agent": ""
108 | },
109 | "json": null,
110 | "origin": "",
111 | "url": "https://httpbin.org/post"
112 | }
113 | ```
114 |
115 | #### multipart/form-data
116 |
117 | ```javascript
118 | var formData = new FormData();
119 | formData.append("cors", "a_problem");
120 |
121 | files = $("input[type='file']")[0].files;
122 | for (var i = 0; i < files.length; i++)
123 | formData.append("file " + (i + 1), files[i]);
124 |
125 | $.ajax({
126 | method: "POST",
127 | url: 'https://cors.io/?' +
128 | 'https://httpbin.org/post',
129 | data: formData,
130 | processData: false,
131 | contentType: false,
132 | success: (res) => console.log(res)
133 | });
134 | ```
135 | ```json
136 | {
137 | "args": {},
138 | "data": "",
139 | "files": {
140 | "file 1": "file 1 content\n",
141 | "file 2": "file 2 content\n"
142 | },
143 | "form": {
144 | "cors": "a_problem"
145 | },
146 | "headers": {
147 | "Accept": "*/*",
148 | "Accept-Encoding": "gzip, deflate",
149 | "Content-Length": "310",
150 | "Content-Type": "multipart/form-data; boundary=1c7006cba3bb1825a4294d7fd319942c",
151 | "Host": "httpbin.org",
152 | "User-Agent": ""
153 | },
154 | "json": null,
155 | "origin": "",
156 | "url": "https://httpbin.org/post"
157 | }
158 | ```
159 |
160 | ### OPTIONS Request
161 |
162 | There is no purpose in requesting this method manually. However, some javascript libraries such as [axios](https://github.com/axios/axios) submit an `OPTIONS` request before the `POST` request in the case of `Content-Type: application/json`.
163 |
164 | In order to work with that, an `OPTIONS` request is sent from the website, to itself. This will return the landing page, along with the required to headers in order for CORS to not block the preflight-response.
165 |
166 | ## Deploying on Heroku
167 |
168 | 1. First of all begin by forking this reposity. This can be done by clicking the fork button next to the top of repository.
169 | 
170 |
171 | 2. Then create your heroku app under the name you like.
172 | > 
173 | > _becomes_
174 | > 
175 |
176 | 3. You will be taken to the new app's page, where you can specify the deployment method you wish to use. In our case, GitHub.
177 | 
178 |
179 | 4. After connecting to GitHub, search for the name of the fork and _Connect_ it.
180 | > 
181 | > _becomes_
182 | > 
183 |
184 | 5. After it has been connected, deploy the branch on Heroku.
185 | > 
186 | > _becomes_
187 | > 
188 |
189 | 6. View your app.
190 | 
191 |
--------------------------------------------------------------------------------
/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. Definitions.
8 |
9 | "License" shall mean the terms and conditions for use, reproduction,
10 | and distribution as defined by Sections 1 through 9 of this document.
11 |
12 | "Licensor" shall mean the copyright owner or entity authorized by
13 | the copyright owner that is granting the License.
14 |
15 | "Legal Entity" shall mean the union of the acting entity and all
16 | other entities that control, are controlled by, or are under common
17 | control with that entity. For the purposes of this definition,
18 | "control" means (i) the power, direct or indirect, to cause the
19 | direction or management of such entity, whether by contract or
20 | otherwise, or (ii) ownership of fifty percent (50%) or more of the
21 | outstanding shares, or (iii) beneficial ownership of such entity.
22 |
23 | "You" (or "Your") shall mean an individual or Legal Entity
24 | exercising permissions granted by this License.
25 |
26 | "Source" form shall mean the preferred form for making modifications,
27 | including but not limited to software source code, documentation
28 | source, and configuration files.
29 |
30 | "Object" form shall mean any form resulting from mechanical
31 | transformation or translation of a Source form, including but
32 | not limited to compiled object code, generated documentation,
33 | and conversions to other media types.
34 |
35 | "Work" shall mean the work of authorship, whether in Source or
36 | Object form, made available under the License, as indicated by a
37 | copyright notice that is included in or attached to the work
38 | (an example is provided in the Appendix below).
39 |
40 | "Derivative Works" shall mean any work, whether in Source or Object
41 | form, that is based on (or derived from) the Work and for which the
42 | editorial revisions, annotations, elaborations, or other modifications
43 | represent, as a whole, an original work of authorship. For the purposes
44 | of this License, Derivative Works shall not include works that remain
45 | separable from, or merely link (or bind by name) to the interfaces of,
46 | the Work and Derivative Works thereof.
47 |
48 | "Contribution" shall mean any work of authorship, including
49 | the original version of the Work and any modifications or additions
50 | to that Work or Derivative Works thereof, that is intentionally
51 | submitted to Licensor for inclusion in the Work by the copyright owner
52 | or by an individual or Legal Entity authorized to submit on behalf of
53 | the copyright owner. For the purposes of this definition, "submitted"
54 | means any form of electronic, verbal, or written communication sent
55 | to the Licensor or its representatives, including but not limited to
56 | communication on electronic mailing lists, source code control systems,
57 | and issue tracking systems that are managed by, or on behalf of, the
58 | Licensor for the purpose of discussing and improving the Work, but
59 | excluding communication that is conspicuously marked or otherwise
60 | designated in writing by the copyright owner as "Not a Contribution."
61 |
62 | "Contributor" shall mean Licensor and any individual or Legal Entity
63 | on behalf of whom a Contribution has been received by Licensor and
64 | subsequently incorporated within the Work.
65 |
66 | 2. Grant of Copyright License. Subject to the terms and conditions of
67 | this License, each Contributor hereby grants to You a perpetual,
68 | worldwide, non-exclusive, no-charge, royalty-free, irrevocable
69 | copyright license to reproduce, prepare Derivative Works of,
70 | publicly display, publicly perform, sublicense, and distribute the
71 | Work and such Derivative Works in Source or Object form.
72 |
73 | 3. Grant of Patent License. Subject to the terms and conditions of
74 | this License, each Contributor hereby grants to You a perpetual,
75 | worldwide, non-exclusive, no-charge, royalty-free, irrevocable
76 | (except as stated in this section) patent license to make, have made,
77 | use, offer to sell, sell, import, and otherwise transfer the Work,
78 | where such license applies only to those patent claims licensable
79 | by such Contributor that are necessarily infringed by their
80 | Contribution(s) alone or by combination of their Contribution(s)
81 | with the Work to which such Contribution(s) was submitted. If You
82 | institute patent litigation against any entity (including a
83 | cross-claim or counterclaim in a lawsuit) alleging that the Work
84 | or a Contribution incorporated within the Work constitutes direct
85 | or contributory patent infringement, then any patent licenses
86 | granted to You under this License for that Work shall terminate
87 | as of the date such litigation is filed.
88 |
89 | 4. Redistribution. You may reproduce and distribute copies of the
90 | Work or Derivative Works thereof in any medium, with or without
91 | modifications, and in Source or Object form, provided that You
92 | meet the following conditions:
93 |
94 | (a) You must give any other recipients of the Work or
95 | Derivative Works a copy of this License; and
96 |
97 | (b) You must cause any modified files to carry prominent notices
98 | stating that You changed the files; and
99 |
100 | (c) You must retain, in the Source form of any Derivative Works
101 | that You distribute, all copyright, patent, trademark, and
102 | attribution notices from the Source form of the Work,
103 | excluding those notices that do not pertain to any part of
104 | the Derivative Works; and
105 |
106 | (d) If the Work includes a "NOTICE" text file as part of its
107 | distribution, then any Derivative Works that You distribute must
108 | include a readable copy of the attribution notices contained
109 | within such NOTICE file, excluding those notices that do not
110 | pertain to any part of the Derivative Works, in at least one
111 | of the following places: within a NOTICE text file distributed
112 | as part of the Derivative Works; within the Source form or
113 | documentation, if provided along with the Derivative Works; or,
114 | within a display generated by the Derivative Works, if and
115 | wherever such third-party notices normally appear. The contents
116 | of the NOTICE file are for informational purposes only and
117 | do not modify the License. You may add Your own attribution
118 | notices within Derivative Works that You distribute, alongside
119 | or as an addendum to the NOTICE text from the Work, provided
120 | that such additional attribution notices cannot be construed
121 | as modifying the License.
122 |
123 | You may add Your own copyright statement to Your modifications and
124 | may provide additional or different license terms and conditions
125 | for use, reproduction, or distribution of Your modifications, or
126 | for any such Derivative Works as a whole, provided Your use,
127 | reproduction, and distribution of the Work otherwise complies with
128 | the conditions stated in this License.
129 |
130 | 5. Submission of Contributions. Unless You explicitly state otherwise,
131 | any Contribution intentionally submitted for inclusion in the Work
132 | by You to the Licensor shall be under the terms and conditions of
133 | this License, without any additional terms or conditions.
134 | Notwithstanding the above, nothing herein shall supersede or modify
135 | the terms of any separate license agreement you may have executed
136 | with Licensor regarding such Contributions.
137 |
138 | 6. Trademarks. This License does not grant permission to use the trade
139 | names, trademarks, service marks, or product names of the Licensor,
140 | except as required for reasonable and customary use in describing the
141 | origin of the Work and reproducing the content of the NOTICE file.
142 |
143 | 7. Disclaimer of Warranty. Unless required by applicable law or
144 | agreed to in writing, Licensor provides the Work (and each
145 | Contributor provides its Contributions) on an "AS IS" BASIS,
146 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
147 | implied, including, without limitation, any warranties or conditions
148 | of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
149 | PARTICULAR PURPOSE. You are solely responsible for determining the
150 | appropriateness of using or redistributing the Work and assume any
151 | risks associated with Your exercise of permissions under this License.
152 |
153 | 8. Limitation of Liability. In no event and under no legal theory,
154 | whether in tort (including negligence), contract, or otherwise,
155 | unless required by applicable law (such as deliberate and grossly
156 | negligent acts) or agreed to in writing, shall any Contributor be
157 | liable to You for damages, including any direct, indirect, special,
158 | incidental, or consequential damages of any character arising as a
159 | result of this License or out of the use or inability to use the
160 | Work (including but not limited to damages for loss of goodwill,
161 | work stoppage, computer failure or malfunction, or any and all
162 | other commercial damages or losses), even if such Contributor
163 | has been advised of the possibility of such damages.
164 |
165 | 9. Accepting Warranty or Additional Liability. While redistributing
166 | the Work or Derivative Works thereof, You may choose to offer,
167 | and charge a fee for, acceptance of support, warranty, indemnity,
168 | or other liability obligations and/or rights consistent with this
169 | License. However, in accepting such obligations, You may act only
170 | on Your own behalf and on Your sole responsibility, not on behalf
171 | of any other Contributor, and only if You agree to indemnify,
172 | defend, and hold each Contributor harmless for any liability
173 | incurred by, or claims asserted against, such Contributor by reason
174 | of your accepting any such warranty or additional liability.
175 |
176 | END OF TERMS AND CONDITIONS
177 |
178 | APPENDIX: How to apply the Apache License to your work.
179 |
180 | To apply the Apache License to your work, attach the following
181 | boilerplate notice, with the fields enclosed by brackets "[]"
182 | replaced with your own identifying information. (Don't include
183 | the brackets!) The text should be enclosed in the appropriate
184 | comment syntax for the file format. We also recommend that a
185 | file or class name and description of purpose be included on the
186 | same "printed page" as the copyright notice for easier
187 | identification within third-party archives.
188 |
189 | Copyright [yyyy] [name of copyright owner]
190 |
191 | Licensed under the Apache License, Version 2.0 (the "License");
192 | you may not use this file except in compliance with the License.
193 | You may obtain a copy of the License at
194 |
195 | http://www.apache.org/licenses/LICENSE-2.0
196 |
197 | Unless required by applicable law or agreed to in writing, software
198 | distributed under the License is distributed on an "AS IS" BASIS,
199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
200 | See the License for the specific language governing permissions and
201 | limitations under the License.
202 |
--------------------------------------------------------------------------------