Repository: finos/git-proxy

Issue:
feat: Add Dockerfile for container-based deploys
**Is your feature request related to a problem? Please describe.**
It's very common in cloud-based deployments to ship a Docker/OCI container for web applications & servers. It would be useful if we provided a default Dockerfile for users building & deploying git-proxy from source to be able to conveniently build the project and create a Docker image. 

As part of a release of git-proxy, the project could also publish a Docker image to [Docker Hub](https://hub.docker.com) under a FINOS namespace for users to simply reuse directly.

**Describe the solution you'd like**
- add a Dockerfile to the repository to build git-proxy as a container image (see https://github.com/finos/git-proxy/pull/269/commits/095cc3a1b48db5ab13fce152585045567282e0e8 for an example)
- build & push an image as part of the release process

**Describe alternatives you've considered**
- we already publish a runnable package to NPM so this may be extraneous. A user Dockerfile could be something as simple as:

```Dockerfile
FROM node:18
ARG GITPROXY_VERSION="1.0.0"

RUN npm install -g @finos/git-proxy@$GITPROXY_VERSION

ENTRYPOINT ["git-proxy"]
```


Discussion:
@Rajdeep1311: I would like to see to this issue.@JamieSlome: @Rajdeep1311 - awesome, thanks for getting involved! 🤝

I'll assign the issue to you!@Rajdeep1311: Thanks sir @JamieSlome @Rajdeep1311: Sir @JamieSlome, I need some help, who should I contact and how?
@JamieSlome: @Rajdeep1311 - of course! Feel free to post any questions you have here.

I am happy to help and I am sure @coopernetes will be able to provide some guidance as well.

How can we help?@Rajdeep1311: I created a dockerfile, built a docker image out of it, and ran it but having some issues with the port, it should run on 3000 but firewall problems I guess@coopernetes: @Rajdeep1311 git-proxy runs on 8000 for the proxy server and 8080 for the management UI. You will need to expose those ports and not 3000. @Rajdeep1311: Okay sir@Rajdeep1311: Sir actually I am new to DevOps, Can you help which file is to be used to create the docker file @coopernetes @Rajdeep1311: Also, I have tried something, if you can see to it, I would like to demonstrate @coopernetes @coopernetes: > Also, I have tried something, if you can see to it, I would like to demonstrate @coopernetes 

Please submit a pull request with your proposed Dockerfile and I can review it. @kyet: Hi @JamieSlome, @coopernetes! This issue should be re-opened.

In #269, commit 7c2d7ca845872d726ef308600755cfbb771fa7bf added a Dockerfile,
and then commit c5cd565d38dfd0bf8f61b63c01b02923a265c1a9 removed it again.
The reason for this was likely because related work was being done in #282.

Ultimately, #269 was merged without a Dockerfile, and #282 was closed without being merged.
In conclusion, #269 did not fix this issue. Did I miss anything?

Solution patch:
diff --git a/.github/workflows/nodejs.yml b/.github/workflows/nodejs.yml
index dbdf4821..aca14ebf 100644
--- a/.github/workflows/nodejs.yml
+++ b/.github/workflows/nodejs.yml
@@ -16,7 +16,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [13.x]
+        node-version: [16.x]
         mongodb-version: [4.4]
 
     steps:
diff --git a/package-lock.json b/package-lock.json
index 16cd438b..5d12ba00 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -27,6 +27,7 @@
         "express-session": "^1.17.1",
         "generate-password": "^1.5.1",
         "history": "5.3.0",
+        "load-plugin": "^5.1.0",
         "lodash": "^4.17.21",
         "moment": "^2.29.4",
         "mongodb": "^5.0.0",
@@ -967,24 +968,6 @@
         "node": ">=v14"
       }
     },
-    "node_modules/@commitlint/load/node_modules/cosmiconfig": {
-      "version": "8.2.0",
-      "resolved": "https://registry.npmjs.org/cosmiconfig/-/cosmiconfig-8.2.0.tgz",
-      "integrity": "sha512-3rTMnFJA1tCOPwRxtgF4wd7Ab2qvDbL8jX+3smjIbS4HlZBagTlpERbdN7iAbWlrfxE3M8c27kTwTawQ7st+OQ==",
-      "dev": true,
-      "dependencies": {
-        "import-fresh": "^3.2.1",
-        "js-yaml": "^4.1.0",
-        "parse-json": "^5.0.0",
-        "path-type": "^4.0.0"
-      },
-      "engines": {
-        "node": ">=14"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/d-fischer"
-      }
-    },
     "node_modules/@commitlint/load/node_modules/resolve-from": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-5.0.0.tgz",
@@ -1033,20 +1016,6 @@
         "node": ">=v14"
       }
     },
-    "node_modules/@commitlint/read/node_modules/fs-extra": {
-      "version": "11.1.1",
-      "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-11.1.1.tgz",
-      "integrity": "sha512-MGIE4HOvQCeUCzmlHs0vXpih4ysz4wg9qiSAu6cd42lVwPbTM1TjV7RusoyQqMmk/95gdQZX72u+YW+c3eEpFQ==",
-      "dev": true,
-      "dependencies": {
-        "graceful-fs": "^4.2.0",
-        "jsonfile": "^6.0.1",
-        "universalify": "^2.0.0"
-      },
-      "engines": {
-        "node": ">=14.14"
-      }
-    },
     "node_modules/@commitlint/resolve-extends": {
       "version": "17.6.7",
       "resolved": "https://registry.npmjs.org/@commitlint/resolve-extends/-/resolve-extends-17.6.7.tgz",
@@ -1300,6 +1269,95 @@
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       "dev": true
     },
+    "node_modules/@isaacs/cliui": {
+      "version": "8.0.2",
+      "resolved": "https://registry.npmjs.org/@isaacs/cliui/-/cliui-8.0.2.tgz",
+      "integrity": "sha512-O8jcjabXaleOG9DQ0+ARXWZBTfnP4WNAqzuiJK7ll44AmxGKv/J2M4TPjxjY3znBCfvBXFzucm1twdyFybFqEA==",
+      "dependencies": {
+        "string-width": "^5.1.2",
+        "string-width-cjs": "npm:string-width@^4.2.0",
+        "strip-ansi": "^7.0.1",
+        "strip-ansi-cjs": "npm:strip-ansi@^6.0.1",
+        "wrap-ansi": "^8.1.0",
+        "wrap-ansi-cjs": "npm:wrap-ansi@^7.0.0"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/@isaacs/cliui/node_modules/ansi-regex": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-6.0.1.tgz",
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+      "engines": {
+        "node": ">=12"
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+      "funding": {
+        "url": "https://github.com/chalk/ansi-regex?sponsor=1"
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+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
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+    },
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+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-5.1.2.tgz",
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+      "dependencies": {
+        "eastasianwidth": "^0.2.0",
+        "emoji-regex": "^9.2.2",
+        "strip-ansi": "^7.0.1"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
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+      "dependencies": {
+        "ansi-regex": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/strip-ansi?sponsor=1"
+      }
+    },
+    "node_modules/@isaacs/cliui/node_modules/wrap-ansi": {
+      "version": "8.1.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-8.1.0.tgz",
+      "integrity": "sha512-si7QWI6zUMq56bESFvagtmzMdGOtoxfR+Sez11Mobfc7tm+VkUckk9bW2UeffTGVUbOksxmSw0AA2gs8g71NCQ==",
+      "dependencies": {
+        "ansi-styles": "^6.1.0",
+        "string-width": "^5.0.1",
+        "strip-ansi": "^7.0.1"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
+      }
+    },
     "node_modules/@jridgewell/gen-mapping": {
       "version": "0.3.3",
       "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.3.tgz",
@@ -1599,6 +1657,158 @@
         "node": ">= 8"
       }
     },
+    "node_modules/@npmcli/config": {
+      "version": "6.2.1",
+      "resolved": "https://registry.npmjs.org/@npmcli/config/-/config-6.2.1.tgz",
+      "integrity": "sha512-Cj/OrSbrLvnwWuzquFCDTwFN8QmR+SWH6qLNCBttUreDkKM5D5p36SeSMbcEUiCGdwjUrVy2yd8C0REwwwDPEw==",
+      "dependencies": {
+        "@npmcli/map-workspaces": "^3.0.2",
+        "ci-info": "^3.8.0",
+        "ini": "^4.1.0",
+        "nopt": "^7.0.0",
+        "proc-log": "^3.0.0",
+        "read-package-json-fast": "^3.0.2",
+        "semver": "^7.3.5",
+        "walk-up-path": "^3.0.1"
+      },
+      "engines": {
+        "node": "^14.17.0 || ^16.13.0 || >=18.0.0"
+      }
+    },
+    "node_modules/@npmcli/config/node_modules/abbrev": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-2.0.0.tgz",
+      "integrity": "sha512-6/mh1E2u2YgEsCHdY0Yx5oW+61gZU+1vXaoiHHrpKeuRNNgFvS+/jrwHiQhB5apAf5oB7UB7E19ol2R2LKH8hQ==",
+      "engines": {
+        "node": "^14.17.0 || ^16.13.0 || >=18.0.0"
+      }
+    },
+    "node_modules/@npmcli/config/node_modules/ini": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/ini/-/ini-4.1.1.tgz",
+      "integrity": "sha512-QQnnxNyfvmHFIsj7gkPcYymR8Jdw/o7mp5ZFihxn6h8Ci6fh3Dx4E1gPjpQEpIuPo9XVNY/ZUwh4BPMjGyL01g==",
+      "engines": {
+        "node": "^14.17.0 || ^16.13.0 || >=18.0.0"
+      }
+    },
+    "node_modules/@npmcli/config/node_modules/lru-cache": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-6.0.0.tgz",
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+      "dependencies": {
+        "yallist": "^4.0.0"
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+      "engines": {
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+    "node_modules/@npmcli/config/node_modules/nopt": {
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+        "nopt": "bin/nopt.js"
+      },
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+    "node_modules/@npmcli/config/node_modules/semver": {
+      "version": "7.5.4",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.5.4.tgz",
+      "integrity": "sha512-1bCSESV6Pv+i21Hvpxp3Dx+pSD8lIPt8uVjRrxAUt/nbswYc+tK6Y2btiULjd4+fnq15PX+nqQDC7Oft7WkwcA==",
+      "dependencies": {
+        "lru-cache": "^6.0.0"
+      },
+      "bin": {
+        "semver": "bin/semver.js"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/@npmcli/config/node_modules/yallist": {
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+      "dependencies": {
+        "@npmcli/name-from-folder": "^2.0.0",
+        "glob": "^10.2.2",
+        "minimatch": "^9.0.0",
+        "read-package-json-fast": "^3.0.0"
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+        "node": "^14.17.0 || ^16.13.0 || >=18.0.0"
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+        "jackspeak": "^2.0.3",
+        "minimatch": "^9.0.1",
+        "minipass": "^5.0.0 || ^6.0.2 || ^7.0.0",
+        "path-scurry": "^1.10.1"
+      },
+      "bin": {
+        "glob": "dist/cjs/src/bin.js"
+      },
+      "engines": {
+        "node": ">=16 || 14 >=14.17"
+      },
+      "funding": {
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+    "node_modules/@npmcli/map-workspaces/node_modules/minimatch": {
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+      "dependencies": {
+        "brace-expansion": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=16 || 14 >=14.17"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
+    "node_modules/@npmcli/name-from-folder": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@npmcli/name-from-folder/-/name-from-folder-2.0.0.tgz",
+      "integrity": "sha512-pwK+BfEBZJbKdNYpHHRTNBwBoqrN/iIMO0AiGvYsp3Hoaq0WbgGSWQR6SCldZovoDpY3yje5lkFUe6gsDgJ2vg==",
+      "engines": {
+        "node": "^14.17.0 || ^16.13.0 || >=18.0.0"
+      }
+    },
+    "node_modules/@pkgjs/parseargs": {
+      "version": "0.11.0",
+      "resolved": "https://registry.npmjs.org/@pkgjs/parseargs/-/parseargs-0.11.0.tgz",
+      "integrity": "sha512-+1VkjdD0QBLPodGrJUeqarH8VAIvQODIbwh9XpP5Syisf7YoQgsJKPNFoqqLQlu+VQ/tVSshMR6loPMn8U+dPg==",
+      "optional": true,
+      "engines": {
+        "node": ">=14"
+      }
+    },
     "node_modules/@pkgr/utils": {
       "version": "2.4.2",
       "resolved": "https://registry.npmjs.org/@pkgr/utils/-/utils-2.4.2.tgz",
@@ -1699,13 +1909,6 @@
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       "dev": true
     },
-    "node_modules/@types/parse-json": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/@types/parse-json/-/parse-json-4.0.0.tgz",
-      "integrity": "sha512-//oorEZjL6sbPcKUaCdIGlIUeH26mgzimjBB77G6XRgnDl/L5wOnpyBGRe/Mmf5CVW3PwEBE1NjiMZ/ssFh4wA==",
-      "dev": true,
-      "peer": true
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     "node_modules/@types/prop-types": {
       "version": "15.7.5",
       "resolved": "https://registry.npmjs.org/@types/prop-types/-/prop-types-15.7.5.tgz",
@@ -1837,11 +2040,6 @@
         "node": ">=4.0"
       }
     },
-    "node_modules/activedirectory2/node_modules/async": {
-      "version": "3.2.4",
-      "resolved": "https://registry.npmjs.org/async/-/async-3.2.4.tgz",
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-    },
     "node_modules/ajv": {
       "version": "6.12.6",
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
@@ -2090,6 +2288,11 @@
         "node": "*"
       }
     },
+    "node_modules/async": {
+      "version": "3.2.4",
+      "resolved": "https://registry.npmjs.org/async/-/async-3.2.4.tgz",
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     "node_modules/async-arrays": {
       "version": "2.0.0",
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@@ -2150,8 +2353,7 @@
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       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
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-      "dev": true
+      "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw=="
     },
     "node_modules/big-integer": {
       "version": "1.6.51",
@@ -2581,6 +2783,20 @@
         "node": ">= 6"
       }
     },
+    "node_modules/ci-info": {
+      "version": "3.8.0",
+      "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-3.8.0.tgz",
+      "integrity": "sha512-eXTggHWSooYhq49F2opQhuHWgzucfF2YgODK4e1566GQs5BIfP30B0oenwBJHfWxAs2fyPB1s7Mg949zLf61Yw==",
+      "funding": [
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       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
@@ -8923,16 +9333,6 @@
       "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==",
       "dev": true
     },
-    "node_modules/yaml": {
-      "version": "1.10.2",
-      "resolved": "https://registry.npmjs.org/yaml/-/yaml-1.10.2.tgz",
-      "integrity": "sha512-r3vXyErRCYJ7wg28yvBY5VSoAF8ZvlcW9/BwUzEtUsjvX/DKs24dIkuwjtuprwJJHsbyUbLApepYTR1BN4uHrg==",
-      "dev": true,
-      "peer": true,
-      "engines": {
-        "node": ">= 6"
-      }
-    },
     "node_modules/yargs": {
       "version": "17.7.2",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.2.tgz",
diff --git a/package.json b/package.json
index a2813e76..0ce9f2ef 100644
--- a/package.json
+++ b/package.json
@@ -36,6 +36,7 @@
     "express-session": "^1.17.1",
     "generate-password": "^1.5.1",
     "history": "5.3.0",
+    "load-plugin": "^5.1.0",
     "lodash": "^4.17.21",
     "moment": "^2.29.4",
     "mongodb": "^5.0.0",
diff --git a/packages/git-proxy-notify-hello/index.js b/packages/git-proxy-notify-hello/index.js
new file mode 100644
index 00000000..93f0a14f
--- /dev/null
+++ b/packages/git-proxy-notify-hello/index.js
@@ -0,0 +1,11 @@
+const Step = require('@finos/git-proxy/src/proxy/actions').Step;
+const plugin = require('@finos/git-proxy/src/plugin');
+
+const helloPlugin = new plugin.ActionPlugin(async (req, action) => {
+  const step = new Step('HelloPlugin');
+  console.log('This is a message from the HelloPlugin!');
+  action.addStep(step);
+  return action;
+});
+
+module.exports.helloPlugin = helloPlugin;
diff --git a/packages/git-proxy-notify-hello/package.json b/packages/git-proxy-notify-hello/package.json
new file mode 100644
index 00000000..64a8d3d5
--- /dev/null
+++ b/packages/git-proxy-notify-hello/package.json
@@ -0,0 +1,13 @@
+{
+  "name": "git-proxy-notify-hello",
+  "version": "1.0.0",
+  "description": "A simple notification plugin to display a message on push via git-proxy",
+  "scripts": {
+    "test": "mocha --exit"
+  },
+  "author": "Thomas Cooper",
+  "license": "Apache-2.0",
+  "dependencies": {
+    "@finos/git-proxy": "file:../.."
+  }
+}
diff --git a/src/plugin.js b/src/plugin.js
new file mode 100644
index 00000000..9e3692da
--- /dev/null
+++ b/src/plugin.js
@@ -0,0 +1,146 @@
+const path = require('path');
+const lpModule = import('load-plugin');
+('use strict');
+
+/**
+ * Finds, registers and loads plugins used by git-proxy
+ */
+class PluginLoader {
+  /**
+   * Initialize PluginLoader with candidates modules (node_modules or relative
+   * file paths).
+   * @param {Array.<string>} names List of Node module/package names to load.
+   * @param {Array.<string>} paths List of file paths to load modules from.
+   */
+  constructor(names, paths) {
+    this.names = names;
+    this.paths = paths;
+    /**
+     * @type {Array.<ProxyPlugin>} List of ProxyPlugin objects loaded.
+     * @public
+     */
+    this.plugins = [];
+  }
+
+  /**
+   * Load configured plugins as modules and set each concrete ProxyPlugin
+   * to this.plugins for use in proxying.
+   */
+  load() {
+    const modulePromises = [];
+    for (const path of this.paths) {
+      modulePromises.push(this._loadFilePlugin(path));
+    }
+    for (const name of this.names) {
+      modulePromises.push(this._loadPackagePlugin(name));
+    }
+    Promise.all(modulePromises).then((vals) => {
+      const modules = vals;
+      console.log(`Found ${modules.length} plugin modules`);
+      const pluginObjPromises = [];
+      for (const mod of modules) {
+        pluginObjPromises.push(this._castToPluginObjects(mod));
+      }
+      Promise.all(pluginObjPromises).then((vals) => {
+        for (const pluginObjs of vals) {
+          this.plugins = this.plugins.concat(pluginObjs);
+        }
+        console.log(`Loaded ${this.plugins.length} plugins`);
+      });
+    });
+  }
+
+  /**
+   * Load a plugin module from a relative file path to the
+   * current working directory.
+   * @param {string} filepath
+   * @return {Module}
+   */
+  async _loadFilePlugin(filepath) {
+    const lp = await lpModule;
+    const resolvedModuleFile = await lp.resolvePlugin(
+      path.join(process.cwd(), filepath),
+    );
+    return await lp.loadPlugin(resolvedModuleFile);
+  }
+
+  /**
+   * Load a plugin module from the specified Node module. Only
+   * modules with the prefix "@finos" are supported.
+   * @param {string} packageName
+   * @return {Module}
+   */
+  async _loadPackagePlugin(packageName) {
+    const lp = await lpModule;
+    const resolvedPackageFile = await lp.resolvePlugin(packageName, {
+      prefix: '@finos',
+    });
+    return await lp.loadPlugin(resolvedPackageFile);
+  }
+
+  /**
+   * Set a list of ProxyPlugin objects to this.plugins
+   * from the keys exported by the passed in module.
+   * @param {Module} pluginModule
+   * @return {ProxyPlugin}
+   */
+  async _castToPluginObjects(pluginModule) {
+    const plugins = [];
+    // iterate over the module.exports keys
+    for (const key of Object.keys(pluginModule)) {
+      if (
+        Object.prototype.hasOwnProperty.call(pluginModule, key) &&
+        pluginModule[key] instanceof ProxyPlugin
+      ) {
+        plugins.push(pluginModule[key]);
+      }
+    }
+    return plugins;
+  }
+}
+
+/**
+ * Parent class for all Git Proxy plugins. New plugin types must inherit from
+ * ProxyPlugin to be loaded by PluginLoader.
+ */
+class ProxyPlugin {}
+
+/**
+ * A plugin which executes a function when receiving a proxy request.
+ */
+class ActionPlugin extends ProxyPlugin {
+  /**
+   * Custom function executed as part of the action chain. The function
+   * must take in two parameters, an {@link https://expressjs.com/en/4x/api.html#req Express Request}
+   * and the current Action executed in the chain.
+   * @param {Promise<Action>} exec A Promise that returns an Action &
+   *                               executes when a push is proxied.
+   */
+  constructor(exec) {
+    super();
+    this.exec = exec;
+  }
+}
+
+const createLoader = async () => {
+  // Auto-register plugins that are part of git-proxy core
+  let names = [];
+  let files = [];
+  if (process.env.GITPROXY_PLUGIN_PACKAGES !== undefined) {
+    names = process.env.GITPROXY_PLUGIN_PACKAGES.split(',');
+  }
+  if (process.env.GITPROXY_PLUGIN_FILES !== undefined) {
+    files = process.env.GITPROXY_PLUGIN_FILES.split(',');
+  }
+  const loader = new PluginLoader(names, files);
+  if (names.length + files.length > 0) {
+    loader.load();
+  }
+  return loader;
+};
+
+module.exports.defaultLoader = createLoader();
+module.exports.ProxyPlugin = ProxyPlugin;
+module.exports.ActionPlugin = ActionPlugin;
+// exported for testing only
+module.exports.createLoader = createLoader;
diff --git a/src/proxy/chain.js b/src/proxy/chain.js
index fe373b2a..39a67d7f 100644
--- a/src/proxy/chain.js
+++ b/src/proxy/chain.js
@@ -1,4 +1,5 @@
 const proc = require('./processors');
+const plugin = require('../plugin');
 
 const pushActionChain = [
   proc.push.parsePush,
@@ -10,12 +11,14 @@ const pushActionChain = [
   proc.push.blockForAuth,
 ];
 
+let pluginsLoaded = false;
+
 const chain = async (req) => {
   let action;
   try {
     action = await proc.pre.parseAction(req);
 
-    const actions = getChain(action);
+    const actions = await getChain(action);
 
     for (const i in actions) {
       if (!i) continue;
@@ -40,9 +43,26 @@ const chain = async (req) => {
   return action;
 };
 
-const getChain = (action) => {
+const getChain = async (action) => {
   if (action.type === 'pull') return [];
-  if (action.type === 'push') return pushActionChain;
+  if (action.type === 'push') {
+    // insert loaded plugins as actions
+    // this probably isn't the place to insert these functions
+    const loader = await plugin.defaultLoader;
+    const pluginActions = loader.plugins;
+    if (!pluginsLoaded && pluginActions.length > 0) {
+      console.log(`Found ${pluginActions.length}, inserting into proxy chain`);
+      for (const pluginAction of pluginActions) {
+        if (pluginAction instanceof plugin.ActionPlugin) {
+          console.log(`Inserting plugin ${pluginAction} into chain`);
+          // insert custom functions after parsePush but before other actions
+          pushActionChain.splice(1, 0, pluginAction.exec);
+        }
+      }
+      pluginsLoaded = true;
+    }
+    return pushActionChain;
+  }
 };
 
 exports.exec = chain;



Test patch:
diff --git a/test/testPluginLoader.js b/test/testPluginLoader.js
new file mode 100644
index 00000000..0c52209a
--- /dev/null
+++ b/test/testPluginLoader.js
@@ -0,0 +1,33 @@
+/* eslint-disable max-len */
+const originalEnv = process.env;
+const chai = require('chai');
+const plugin = require('../src/plugin');
+
+chai.should();
+
+const expect = chai.expect;
+
+describe('creating a new PluginLoader and loading plugins', function () {
+  before(function () {
+    process.env.GITPROXY_PLUGIN_FILES =
+      './packages/git-proxy-notify-hello/index.js';
+  });
+
+  it('should load file-based plugins when set from env var', async function () {
+    plugin.createLoader().then((loader) => {
+      expect(loader.paths).to.eql([
+        './packages/git-proxy-notify-hello/index.js',
+      ]);
+      expect(loader.names).to.be.empty;
+      expect(loader.plugins.length).to.equal(1);
+      expect(loader.plugins[0])
+        .to.be.an.instanceOf(plugin.ProxyPlugin)
+        .and.to.be.an.instanceOf(plugin.ActionPlugin);
+    });
+  });
+
+  after(function () {
+    // prevent potential side-effects in other tests
+    process.env = originalEnv;
+  });
+});