Add proxy

.gitignore

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+/oauth2-dev-proxy

.goreleaser.yml

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+builds:
+  - binary: oauth2-dev-proxy
+    goos:
+      - darwin
+      - linux
+      - windows
+    goarch:
+      - amd64
+archive:
+  # An archive just makes installation harder
+  format: binary

.travis.yml

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+language: go
+go:
+  - "1.10"
+os:
+  - linux

Gopkg.toml

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+# Gopkg.toml example
+#
+# Refer to https://github.com/golang/dep/blob/master/docs/Gopkg.toml.md
+# for detailed Gopkg.toml documentation.
+#
+# required = ["github.com/user/thing/cmd/thing"]
+# ignored = ["github.com/user/project/pkgX", "bitbucket.org/user/project/pkgA/pkgY"]
+#
+# [[constraint]]
+#   name = "github.com/user/project"
+#   version = "1.0.0"
+#
+# [[constraint]]
+#   name = "github.com/user/project2"
+#   branch = "dev"
+#   source = "github.com/myfork/project2"
+#
+# [[override]]
+#   name = "github.com/x/y"
+#   version = "2.4.0"
+#
+# [prune]
+#   non-go = false
+#   go-tests = true
+#   unused-packages = true
+
+
+[prune]
+  go-tests = true
+  unused-packages = true
+
+[[constraint]]
+  branch = "master"
+  name = "github.com/pkg/browser"

LICENSE

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README.md

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+# OAuth2 API Proxy for Development
+
+A reverse proxy to be run on development machines that allows transparent access to APIs and other HTTP resources behind an [oauth2_proxy](https://github.com/bitly/oauth2_proxy) authenticating reverse proxy.
+
+After authenticating via an OpenID Connect identity provider in the default browser, the dev proxy transparently adds the authentication cookie used by *oauth2_proxy* to requests directed to the dev proxy.
+
+## Why?
+
+* No need to modify API clients to add credentials
+* No need to store/manage credentials on development machines
+* Authentication via identity provider
+    - No manually managed credentials on proxy (e.g. basic auth htpasswd file)
+    - Centralized user managemnent via provider
+* Convenience: Authentication in default browser to leverage active identity provider session
+
+## Usage
+
+1. Start the dev proxy: `oauth2-dev-proxy <TARGET BASE URL>`, e.g. `oauth2-dev-proxy https://api-staging.example.com`
+2. The dev proxy automatically opens the identity provider's page in your default browser.
+3. Log in to your identity provider - if you're already logged in there, authentication may happen without manual interaction.
+4. The proxy shows a success browser page including the local HTTP endpoint you can use for accessing the API you provided in step 1.
+
+Example success message in the browser:
+
+```
+Authentication complete. You can now use the proxy.
+
+Proxy URL: http://127.0.0.1:8124
+Upstream: https://api-staging.example.com
+
+You can close this window.
+```
+
+Example output in the shell:
+
+```
+2018/07/10 08:29:45 Please authenticate in your browser via our identity provider.
+2018/07/10 08:29:46 Authentication complete. You can now use the proxy.
+
+Proxy URL: http://127.0.0.1:8124
+Upstream: https://api-staging.example.com
+
+The proxy will automatically terminate in 12 hours (reauthentication required)
+```
+
+## Installation
+
+### Binary
+
+Download the binary from the [releases page](https://github.com/FRI-DAY/oauth2-dev-proxy/releases) and make it executable:
+
+    VERSION="0.0.1-alpha1"; OS="darwin" # or linux or windows
+    curl --silent --location https://github.com/FRI-DAY/oauth2-dev-proxy/releases/download/v${VERSION}/oauth2-dev-proxy_${VERSION}_${OS}_amd64 \
+      > /usr/local/bin/oauth2-dev-proxy && \
+    chmod +x /usr/local/bin/oauth2-dev-proxy
+
+### Source
+
+    go get github.com/FRI-DAY/oauth2-dev-proxy
+
+## oauth2_proxy Setup
+
+You deploy [oauth2_proxy](https://github.com/bitly/oauth2_proxy) as ususal, the only difference is to set a special redirect URL:
+
+    -redirect-url=http://127.0.0.1:8123/oauth2/callback
+
+You also need to allow this redirect URL in your identity provider's configuration.
+
+## Architecture
+
+The following diagram shows HTTP requests made by the different components.
+
+```
+  Development machine
++------------------------------------------+     +--------------+     +-----------------+
+|                                          |     |              |     |                 |
+| API Client  +------->  oauth2-dev-proxy +----> | oauth2-proxy | +-> | Service (API)   |
+| (e.g. curl)                ^             |     |              |     |                 |
+|                            |             |     +------+-------+     +-----------------+
+|                            |             |            |
+| Browser  +-----------------+             |     +------v-----------+
+|          +-----------------------------------> |                  |
+|                                          |     | Identity Provider|
++------------------------------------------+     |                  |
+                                                 +------------------+
+```
+
+The *dev proxy* uses a trick to allow authentication with the identity provider in the local browser, while making the requests to the *oauth2_proxy* directly, so the *dev proxy* can capture the authentication cookie from *oauth2_proxy*.
+
+The trick requires a separate *oauth2_proxy* instance to be deployed with a redirect URL of `http://127.0.0.1:8123/oauth2/callback`.
+
+From the dev proxy's point of view, the process works like this:
+
+1. Start an HTTP server on port 8123
+2. Request `TARGET/oauth2/start`
+    - Store the CSRF cookie
+    - Note the identity provider URL the proxy redirects to
+3. Open the identity provider URL in the local default browser
+4. The user authenticates to the identity provider
+5. The identity provider redirects to `http://127.0.0.1:8123/oauth2/callback`
+6. Forward the `/oauth2/callback` request to the *oauth2_proxy*, including the auth code
+    - From the response, note the `_oauth2_proxy` cookie
+7. Start a reverse proxy server to the target URL on another port, configured to transparently add the `_oauth2_proxy` cookie to all requests
+8. After the cookie expires, shut down the proxy