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app_vue/node_modules/http-proxy-middleware/dist/handlers/response-interceptor.js

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+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.responseInterceptor = void 0;
+const zlib = require("zlib");
+/**
+ * Intercept responses from upstream.
+ * Automatically decompress (deflate, gzip, brotli).
+ * Give developer the opportunity to modify intercepted Buffer and http.ServerResponse
+ *
+ * NOTE: must set options.selfHandleResponse=true (prevent automatic call of res.end())
+ */
+function responseInterceptor(interceptor) {
+    return async function proxyRes(proxyRes, req, res) {
+        const originalProxyRes = proxyRes;
+        let buffer = Buffer.from('', 'utf8');
+        // decompress proxy response
+        const _proxyRes = decompress(proxyRes, proxyRes.headers['content-encoding']);
+        // concat data stream
+        _proxyRes.on('data', (chunk) => (buffer = Buffer.concat([buffer, chunk])));
+        _proxyRes.on('end', async () => {
+            // copy original headers
+            copyHeaders(proxyRes, res);
+            // call interceptor with intercepted response (buffer)
+            const interceptedBuffer = Buffer.from(await interceptor(buffer, originalProxyRes, req, res));
+            // set correct content-length (with double byte character support)
+            res.setHeader('content-length', Buffer.byteLength(interceptedBuffer, 'utf8'));
+            res.write(interceptedBuffer);
+            res.end();
+        });
+        _proxyRes.on('error', (error) => {
+            res.end(`Error fetching proxied request: ${error.message}`);
+        });
+    };
+}
+exports.responseInterceptor = responseInterceptor;
+/**
+ * Streaming decompression of proxy response
+ * source: https://github.com/apache/superset/blob/9773aba522e957ed9423045ca153219638a85d2f/superset-frontend/webpack.proxy-config.js#L116
+ */
+function decompress(proxyRes, contentEncoding) {
+    let _proxyRes = proxyRes;
+    let decompress;
+    switch (contentEncoding) {
+        case 'gzip':
+            decompress = zlib.createGunzip();
+            break;
+        case 'br':
+            decompress = zlib.createBrotliDecompress();
+            break;
+        case 'deflate':
+            decompress = zlib.createInflate();
+            break;
+        default:
+            break;
+    }
+    if (decompress) {
+        _proxyRes.pipe(decompress);
+        _proxyRes = decompress;
+    }
+    return _proxyRes;
+}
+/**
+ * Copy original headers
+ * https://github.com/apache/superset/blob/9773aba522e957ed9423045ca153219638a85d2f/superset-frontend/webpack.proxy-config.js#L78
+ */
+function copyHeaders(originalResponse, response) {
+    response.statusCode = originalResponse.statusCode;
+    response.statusMessage = originalResponse.statusMessage;
+    if (response.setHeader) {
+        let keys = Object.keys(originalResponse.headers);
+        // ignore chunked, brotli, gzip, deflate headers
+        keys = keys.filter((key) => !['content-encoding', 'transfer-encoding'].includes(key));
+        keys.forEach((key) => {
+            let value = originalResponse.headers[key];
+            if (key === 'set-cookie') {
+                // remove cookie domain
+                value = Array.isArray(value) ? value : [value];
+                value = value.map((x) => x.replace(/Domain=[^;]+?/i, ''));
+            }
+            response.setHeader(key, value);
+        });
+    }
+    else {
+        response.headers = originalResponse.headers;
+    }
+}