From c8f0071c4f5336dfe0efc5d3c218ab49f2401264 Mon Sep 17 00:00:00 2001
From: Elena Vilchik
Date: Wed, 18 Dec 2019 17:10:10 +0100
Subject: Rely on NodeJS API of Stylelint to execute CSS rules (#221)

---
 sonar-css-plugin/css-bundle/src/server.ts | 116 ++++++++++++++++++++++++++++++
 1 file changed, 116 insertions(+)
 create mode 100644 sonar-css-plugin/css-bundle/src/server.ts

(limited to 'sonar-css-plugin/css-bundle/src')

diff --git a/sonar-css-plugin/css-bundle/src/server.ts b/sonar-css-plugin/css-bundle/src/server.ts
new file mode 100644
index 0000000..05405c8
--- /dev/null
+++ b/sonar-css-plugin/css-bundle/src/server.ts
@@ -0,0 +1,116 @@
+import { Server } from "http";
+import * as express from "express";
+import { AddressInfo } from "net";
+import * as stylelint from "stylelint";
+import * as fs from "fs";
+import * as bodyParser from "body-parser";
+
+// for testing purposes
+let log = console.log;
+let logError = console.error;
+
+export function setLogHandlersForTests(
+  logHandler: typeof console.log,
+  errorHandler: typeof console.error
+) {
+  log = logHandler;
+  logError = errorHandler;
+}
+
+export function start(port = 0): Promise<Server> {
+  return new Promise(resolve => {
+    log("DEBUG starting stylelint-bridge server at port", port);
+    const app = express();
+    app.use(bodyParser.json());
+    app.post("/analyze", analyzeWithStylelint);
+    app.get("/status", (_: express.Request, resp: express.Response) =>
+      resp.send("OK!")
+    );
+
+    // every time something is wrong we log error and send empty response (with 0 issues)
+    // it's important to keep this call last in configuring "app"
+    app.use(
+      (
+        error: any,
+        _req: express.Request,
+        response: express.Response,
+        _next: any
+      ) => processError(error, response)
+    );
+
+    const server = app.listen(port, () => {
+      log(
+        "DEBUG stylelint-bridge server is running at port",
+        (server.address() as AddressInfo).port
+      );
+      resolve(server);
+    });
+  });
+}
+
+function analyzeWithStylelint(
+  request: express.Request,
+  response: express.Response
+) {
+  const parsedRequest = request.body as AnalysisInput;
+  const { filePath, configFile } = parsedRequest;
+  const code = getFileContent(filePath);
+
+  const options = {
+    code,
+    codeFilename: filePath,
+    configFile
+  };
+
+  stylelint
+    .lint(options)
+    .then(result => response.json(toIssues(result.results, filePath)))
+    .catch(error => processError(error, response));
+}
+
+function processError(error: any, response: express.Response) {
+  logError(error);
+  response.json([]);
+}
+
+function toIssues(results: stylelint.LintResult[], filePath: string): Issue[] {
+  const analysisResponse: Issue[] = [];
+  // we should have only one element in 'results' as we are analyzing only 1 file
+  results.forEach(result => {
+    // to avoid reporting on "fake" source like <input ccs 1>
+    if (result.source !== filePath) {
+      log(
+        `DEBUG For file [${filePath}] received issues with [${result.source}] as a source. They will not be reported.`
+      );
+      return;
+    }
+    result.warnings.forEach(warning =>
+      analysisResponse.push({
+        line: warning.line,
+        text: warning.text,
+        rule: warning.rule
+      })
+    );
+  });
+  return analysisResponse;
+}
+
+function getFileContent(filePath: string) {
+  const fileContent = fs.readFileSync(filePath, { encoding: "utf8" });
+  // strip BOM
+  if (fileContent.charCodeAt(0) === 0xfeff) {
+    return fileContent.slice(1);
+  }
+  return fileContent;
+}
+
+export interface AnalysisInput {
+  filePath: string;
+  configFile: string;
+}
+
+export interface Issue {
+  line: number;
+  rule: string;
+  text: string;
+}
-- 
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