feat: support configure a proxy url (#197)

* feat: support configure a proxy url

Signed-off-by: Ruben Romero Montes <rromerom@redhat.com>

* feat: add tests for proxy

Signed-off-by: Ruben Romero Montes <rromerom@redhat.com>

---------

Signed-off-by: Ruben Romero Montes <rromerom@redhat.com>

Author: ruromero

.gitignore

@@ -6,4 +6,6 @@ http_requests
 json_responses
 integration/**/package-lock.json
 unit-tests-result.json
-.gradle
+.gradle
+build
+target

README.md

@@ -307,8 +307,9 @@ let options = {
   'EXHORT_PIP3_PATH' : '/path/to/pip3',
   'EXHORT_PYTHON_PATH' : '/path/to/python',
   'EXHORT_PIP_PATH' : '/path/to/pip',
-  'EXHORT_GRADLE_PATH' : '/path/to/gradle'
-
+  'EXHORT_GRADLE_PATH' : '/path/to/gradle',
+  // Configure proxy for all requests
+  'EXHORT_PROXY_URL': 'http://proxy.example.com:8080'
 }
 
 // Get stack analysis in JSON format ( all package managers, pom.xml is as an example here)
@@ -322,6 +323,27 @@ let componentAnalysis = await exhort.componentAnalysis('/path/to/pom.xml', optio
  **_Environment variables takes precedence._**
 </p>
 
+<h4>Proxy Configuration</h4>
+<p>
+You can configure a proxy for all HTTP/HTTPS requests made by the API. This is useful when your environment requires going through a proxy to access external services.
+
+You can set the proxy URL in two ways:
+
+1. Using environment variable:
+```shell
+export EXHORT_PROXY_URL=http://proxy.example.com:8080
+```
+
+2. Using the options object when calling the API programmatically:
+```javascript
+const options = {
+  'EXHORT_PROXY_URL': 'http://proxy.example.com:8080'
+}
+```
+
+The proxy URL should be in the format: `http://host:port` or `https://host:port`. The API will automatically use the appropriate protocol (HTTP or HTTPS) based on the proxy URL provided.
+</p>
+
 <h4>Customizing Executables</h4>
 <p>
 This project uses each ecosystem's executable for creating dependency trees. These executables are expected to be

src/analysis.js

@@ -2,13 +2,32 @@ import fs from "node:fs";
 import path from "node:path";
 import {EOL} from "os";
 import {RegexNotToBeLogged, getCustom} from "./tools.js";
+import http from 'node:http';
+import https from 'node:https';
 
 export default { requestComponent, requestStack, validateToken }
 
 const rhdaTokenHeader = "rhda-token";
 const rhdaSourceHeader = "rhda-source"
 const rhdaOperationTypeHeader = "rhda-operation-type"
 
+/**
+ * Adds proxy agent configuration to fetch options if a proxy URL is specified
+ * @param {Object} options - The base fetch options
+ * @param {Object} opts - The exhort options that may contain proxy configuration
+ * @returns {Object} The fetch options with proxy agent if applicable
+ */
+function addProxyAgent(options, opts) {
+	const proxyUrl = getCustom('EXHORT_PROXY_URL', null, opts);
+	if (proxyUrl) {
+		const proxyUrlObj = new URL(proxyUrl);
+		options.agent = proxyUrlObj.protocol === 'https:'
+			? new https.Agent({ proxy: proxyUrl })
+			: new http.Agent({ proxy: proxyUrl });
+	}
+	return options;
+}
+
 /**
  * Send a stack analysis request and get the report as 'text/html' or 'application/json'.
  * @param {import('./provider').Provider | import('./providers/base_java.js').default } provider - the provided data for constructing the request
@@ -29,15 +48,18 @@ async function requestStack(provider, manifest, url, html = false, opts = {}) {
 	if (process.env["EXHORT_DEBUG"] === "true") {
 		console.log("Starting time of sending stack analysis request to exhort server= " + startTime)
 	}
-	let resp = await fetch(`${url}/api/v4/analysis`, {
+
+	const fetchOptions = addProxyAgent({
 		method: 'POST',
 		headers: {
 			'Accept': html ? 'text/html' : 'application/json',
 			'Content-Type': provided.contentType,
 			...getTokenHeaders(opts)
 		},
 		body: provided.content
-	})
+	}, opts);
+
+	let resp = await fetch(`${url}/api/v4/analysis`, fetchOptions)
 	let result
 	if(resp.status === 200) {
 		if (!html) {
@@ -82,15 +104,18 @@ async function requestComponent(provider, manifest, url, opts = {}) {
 	if (process.env["EXHORT_DEBUG"] === "true") {
 		console.log("Starting time of sending component analysis request to exhort server= " + new Date())
 	}
-	let resp = await fetch(`${url}/api/v4/analysis`, {
+
+	const fetchOptions = addProxyAgent({
 		method: 'POST',
 		headers: {
 			'Accept': 'application/json',
 			'Content-Type': provided.contentType,
 			...getTokenHeaders(opts),
 		},
 		body: provided.content
-	})
+	}, opts);
+
+	let resp = await fetch(`${url}/api/v4/analysis`, fetchOptions)
 	let result
 	if(resp.status === 200) {
 		result = await resp.json()
@@ -119,13 +144,14 @@ async function requestComponent(provider, manifest, url, opts = {}) {
  * @return {Promise<number>} return the HTTP status Code of the response from the validate token request.
  */
 async function validateToken(url, opts = {}) {
-	let resp = await fetch(`${url}/api/v4/token`, {
+	const fetchOptions = addProxyAgent({
 		method: 'GET',
 		headers: {
-			// 'Accept': 'text/plain',
 			...getTokenHeaders(opts),
 		}
-	})
+	}, opts);
+
+	let resp = await fetch(`${url}/api/v4/token`, fetchOptions)
 	if (process.env["EXHORT_DEBUG"] === "true") {
 		let exRequestId = resp.headers.get("ex-request-id");
 		if (exRequestId) {

test/analysis.test.js

@@ -202,4 +202,72 @@ suite('testing the analysis module for sending api requests', () => {
 			}
 		))
 	})
+
+	suite('verify proxy configuration', () => {
+		let fakeManifest = 'fake-file.typ'
+		let stackProviderStub = sinon.stub()
+		stackProviderStub.withArgs(fakeManifest).returns(fakeProvided)
+		let fakeProvider = {
+			provideComponent: () => {},
+			provideStack: stackProviderStub,
+			isSupported: () => {}
+		};
+
+		afterEach(() => {
+			delete process.env['EXHORT_PROXY_URL']
+		})
+
+		test('when HTTP proxy is configured, verify agent is set correctly', interceptAndRun(
+			rest.post(`${backendUrl}/api/v3/analysis`, (req, res, ctx) => {
+				// The request should go through the proxy
+				return res(ctx.json({ok: 'ok'}))
+			}),
+			async () => {
+				const httpProxyUrl = 'http://proxy.example.com:8080'
+				const options = {
+					'EXHORT_PROXY_URL': httpProxyUrl
+				}
+				let res = await analysis.requestStack(fakeProvider, fakeManifest, backendUrl, false, options)
+				expect(res).to.deep.equal({ok: 'ok'})
+			}
+		))
+
+		test('when HTTPS proxy is configured, verify agent is set correctly', interceptAndRun(
+			rest.post(`${backendUrl}/api/v3/analysis`, (req, res, ctx) => {
+				// The request should go through the proxy
+				return res(ctx.json({ok: 'ok'}))
+			}),
+			async () => {
+				const httpsProxyUrl = 'https://proxy.example.com:8080'
+				const options = {
+					'EXHORT_PROXY_URL': httpsProxyUrl
+				}
+				let res = await analysis.requestStack(fakeProvider, fakeManifest, backendUrl, false, options)
+				expect(res).to.deep.equal({ok: 'ok'})
+			}
+		))
+
+		test('when proxy is configured via environment variable, verify agent is set correctly', interceptAndRun(
+			rest.post(`${backendUrl}/api/v3/analysis`, (req, res, ctx) => {
+				// The request should go through the proxy
+				return res(ctx.json({ok: 'ok'}))
+			}),
+			async () => {
+				process.env['EXHORT_PROXY_URL'] = 'http://proxy.example.com:8080'
+				let res = await analysis.requestStack(fakeProvider, fakeManifest, backendUrl)
+				expect(res).to.deep.equal({ok: 'ok'})
+			}
+		))
+
+		test('when no proxy is configured, verify no agent is set', interceptAndRun(
+			rest.post(`${backendUrl}/api/v3/analysis`, (req, res, ctx) => {
+				// The request should go directly without proxy
+				return res(ctx.json({ok: 'ok'}))
+			}),
+			async () => {
+				let res = await analysis.requestStack(fakeProvider, fakeManifest, backendUrl)
+				expect(res).to.deep.equal({ok: 'ok'})
+			}
+		))
+	})
 })