mirror of
https://github.com/azures04/crafatar.git
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86 lines
2.4 KiB
JavaScript
86 lines
2.4 KiB
JavaScript
var logging = require("./logging");
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var config = require("./config");
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var crc = require("crc").crc32;
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var human_status = {
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"-2": "user error",
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"-1": "server error",
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0: "none",
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1: "cached",
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2: "downloaded",
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3: "checked",
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};
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// handles HTTP responses
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// +request+ a http.IncomingMessage
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// +response+ a http.ServerResponse
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// +result+ an object with:
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// * status: see human_status, required
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// * redirect: redirect URL
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// * body: file or message, required unless redirect is present or status is < 0
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// * type: a valid Content-Type for the body, defaults to "text/plain"
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// * hash: image hash, required when body is an image
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// * err: a possible Error
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module.exports = function(request, response, result) {
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response.on("close", function() {
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logging.warn(request.id, "Connection closed");
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});
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response.on("finish", function() {
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logging.log(request.id, response.statusCode, "(" + human_status[result.status] + ")");
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});
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response.on("error", function(err) {
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logging.error(request.id, err);
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});
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// These headers are the same for every response
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var headers = {
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"Content-Type": result.type || "text/plain",
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"Cache-Control": "max-age=" + config.browser_cache_time + ", public",
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"Response-Time": Date.now() - request.start,
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"X-Storage-Type": human_status[result.status],
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"X-Request-ID": request.id,
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"Access-Control-Allow-Origin": "*"
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};
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if (result.err) {
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logging.error(result.err);
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}
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if (result.body) {
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// use Mojang's image hash if available
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// use crc32 as a hash function otherwise
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var etag = result.body && result.hash && result.hash.substr(0, 10) || crc(result.body);
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headers.Etag = "\"" + etag + "\"";
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// handle etag caching
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var incoming_etag = request.headers["if-none-match"];
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if (incoming_etag && incoming_etag === headers.Etag) {
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logging.debug("Etag matches");
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response.writeHead(304, headers);
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response.end();
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return;
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}
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}
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if (result.redirect) {
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headers.Location = result.redirect;
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response.writeHead(307, headers);
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response.end();
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return;
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}
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if (result.status === -2) {
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response.writeHead(422, headers);
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response.end(result.body);
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} else if (result.status === -1) {
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response.writeHead(500, headers);
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response.end(result.body);
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} else {
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response.writeHead(200, headers);
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response.end(result.body);
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}
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}; |