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Extract and modernize the webserver's file serving code

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The `handler` method contained this code in an inline function, which
made the `handler` method big and harder to read. Moreover, this code
relied on variables from the outer scope, which made it harder to reason
about because the inputs and outputs weren't easily visible.

This commit fixes the problems by extracting the file serving code into
a dedicated private method, and modernizing it to use e.g. `const`/`let`
instead of `var` and using template strings.
This commit is contained in:
Tim van der Meij 2024-02-11 13:45:06 +01:00
parent 12b9685714
commit 56d9930a7b
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GPG key ID: 8C3FD2925A5F2762
1 changed files with 26 additions and 28 deletions
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54
test/webserver.mjs
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@ -82,6 +82,7 @@ class WebServer {
}
#handler(req, res) {
var self = this;
var url = req.url.replaceAll("//", "/");
var urlParts = /([^?]*)((?:\?(.*))?)/.exec(url);
try {
@ -126,7 +127,6 @@ class WebServer {
}
var disableRangeRequests = this.disableRangeRequests;
var cacheExpirationTime = this.cacheExpirationTime;
var filePath;
fs.realpath(path.join(this.root, pathPart), checkFile);
@ -192,7 +192,7 @@ class WebServer {
if (verbose) {
console.log(url);
}
serveRequestedFile(filePath);
self.#serveFile(res, filePath, fileSize);
}
function escapeHTML(untrusted) {
@ -286,32 +286,6 @@ class WebServer {
});
}
function serveRequestedFile(reqFilePath) {
var stream = fs.createReadStream(reqFilePath, { flags: "rs" });
stream.on("error", function (error) {
res.writeHead(500);
res.end();
});
var ext = path.extname(reqFilePath).toLowerCase();
var contentType = mimeTypes[ext] || defaultMimeType;
if (!disableRangeRequests) {
res.setHeader("Accept-Ranges", "bytes");
}
res.setHeader("Content-Type", contentType);
res.setHeader("Content-Length", fileSize);
if (cacheExpirationTime > 0) {
var expireTime = new Date();
expireTime.setSeconds(expireTime.getSeconds() + cacheExpirationTime);
res.setHeader("Expires", expireTime.toUTCString());
}
res.writeHead(200);
stream.pipe(res);
}
function serveRequestedFileRange(reqFilePath, start, end) {
var stream = fs.createReadStream(reqFilePath, {
flags: "rs",
@ -339,6 +313,30 @@ class WebServer {
stream.pipe(res);
}
}
#serveFile(response, filePath, fileSize) {
const stream = fs.createReadStream(filePath, { flags: "rs" });
stream.on("error", error => {
response.writeHead(500);
response.end();
});
const extension = path.extname(filePath).toLowerCase();
const contentType = mimeTypes[extension] || defaultMimeType;
if (!this.disableRangeRequests) {
response.setHeader("Accept-Ranges", "bytes");
}
response.setHeader("Content-Type", contentType);
response.setHeader("Content-Length", fileSize);
if (this.cacheExpirationTime > 0) {
const expireTime = new Date();
expireTime.setSeconds(expireTime.getSeconds() + this.cacheExpirationTime);
response.setHeader("Expires", expireTime.toUTCString());
}
response.writeHead(200);
stream.pipe(response);
}
}
// This supports the "Cross-origin" test in test/unit/api_spec.js