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parse-body.ts
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parse-body.ts
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import type { Middleware } from "@koa/router";
import { promises as fs } from "fs";
import koaBody from "koa-body";
import File from "../data-structures/file";
import { ValidationError } from "../response/errors";
import dotProp from "dot-prop";
function setDeep(
target: Record<string, unknown>,
complex_key: string,
value: unknown
) {
dotProp.set(
target,
complex_key.replaceAll("[", ".").replaceAll("]", ""),
value
);
}
export default function parseBody(): Middleware {
const koaParser = koaBody({ multipart: true });
return async (ctx, next) => {
await koaParser(ctx, () => Promise.resolve());
const original_body = ctx.request.body || {};
ctx.request.body = {};
const promises: Promise<void>[] = [];
if (ctx.request.files) {
for (const file_name in ctx.request.files) {
let files = ctx.request.files[file_name];
if (!Array.isArray(files)) {
if (
files.type === "application/json" &&
files.name === "blob"
) {
promises.push(
fs
.readFile(files.path, "utf-8")
.then((json_str) =>
setDeep(
ctx.request.body,
file_name,
JSON.parse(json_str)
)
)
);
continue;
} else {
files = [files];
}
}
const file_promises = files.map(async (file) => {
const extracted_filename = file.name;
if (extracted_filename) {
return File.fromPath(
ctx.$app,
file.path,
extracted_filename
);
}
});
promises.push(
Promise.all(file_promises).then((sealious_files) => {
setDeep(ctx.request.body, file_name, sealious_files);
})
);
}
}
for (const [key, value] of Object.entries(original_body)) {
setDeep(ctx.request.body, key, value);
}
for (const [key, value] of Object.entries(ctx.query)) {
// eslint-disable-next-line @typescript-eslint/no-unsafe-member-access
if (ctx.request.body[key] === undefined) {
// eslint-disable-next-line @typescript-eslint/no-unsafe-member-access
setDeep(ctx.request.body, key, value);
}
}
await Promise.all(promises);
ctx.$app.Logger.info("REQUEST", "Parsed body", ctx.request.body);
ctx.$body = ctx.request.body;
await next();
};
}

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