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refactor(std/multipart): make readForm() return value more type safe (#4710)
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3a5dae4303
commit
6e0c9a0c32
2 changed files with 145 additions and 50 deletions
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@ -251,6 +251,17 @@ function skipLWSPChar(u: Uint8Array): Uint8Array {
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return ret.slice(0, j);
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}
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export interface MultipartFormData {
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file(key: string): FormFile | undefined;
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value(key: string): string | undefined;
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entries(): IterableIterator<[string, string | FormFile | undefined]>;
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[Symbol.iterator](): IterableIterator<
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[string, string | FormFile | undefined]
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>;
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/** Remove all tempfiles */
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removeAll(): Promise<void>;
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}
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/** Reader for parsing multipart/form-data */
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export class MultipartReader {
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readonly newLine = encoder.encode("\r\n");
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@ -268,11 +279,11 @@ export class MultipartReader {
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* overflowed file data will be written to temporal files.
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* String field values are never written to files.
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* null value means parsing or writing to file was failed in some reason.
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* @param maxMemory maximum memory size to store file in memory. bytes. @default 1048576 (1MB)
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* */
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async readForm(
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maxMemory: number
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): Promise<{ [key: string]: null | string | FormFile }> {
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const result = Object.create(null);
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async readForm(maxMemory = 10 << 20): Promise<MultipartFormData> {
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const fileMap = new Map<string, FormFile>();
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const valueMap = new Map<string, string>();
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let maxValueBytes = maxMemory + (10 << 20);
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const buf = new Buffer(new Uint8Array(maxValueBytes));
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for (;;) {
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@ -292,11 +303,11 @@ export class MultipartReader {
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throw new RangeError("message too large");
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}
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const value = buf.toString();
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result[p.formName] = value;
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valueMap.set(p.formName, value);
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continue;
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}
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// file
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let formFile: FormFile | null = null;
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let formFile: FormFile | undefined;
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const n = await copy(buf, p);
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const contentType = p.headers.get("content-type");
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assert(contentType != null, "content-type must be set");
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@ -333,9 +344,11 @@ export class MultipartReader {
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maxMemory -= n;
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maxValueBytes -= n;
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}
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result[p.formName] = formFile;
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if (formFile) {
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fileMap.set(p.formName, formFile);
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}
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}
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return result;
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return multipatFormData(fileMap, valueMap);
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}
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private currentPart: PartReader | undefined;
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@ -399,6 +412,43 @@ export class MultipartReader {
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}
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}
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function multipatFormData(
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fileMap: Map<string, FormFile>,
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valueMap: Map<string, string>
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): MultipartFormData {
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function file(key: string): FormFile | undefined {
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return fileMap.get(key);
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}
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function value(key: string): string | undefined {
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return valueMap.get(key);
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}
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function* entries(): IterableIterator<
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[string, string | FormFile | undefined]
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> {
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yield* fileMap;
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yield* valueMap;
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}
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async function removeAll(): Promise<void> {
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const promises: Array<Promise<void>> = [];
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for (const val of fileMap.values()) {
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if (!val.tempfile) continue;
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promises.push(Deno.remove(val.tempfile));
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}
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await Promise.all(promises);
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}
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return {
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file,
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value,
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entries,
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removeAll,
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[Symbol.iterator](): IterableIterator<
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[string, string | FormFile | undefined]
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> {
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return entries();
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},
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};
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}
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class PartWriter implements Writer {
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closed = false;
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private readonly partHeader: string;
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@ -1,16 +1,14 @@
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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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const { Buffer, copy, open, remove } = Deno;
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const { Buffer, copy, open, test } = Deno;
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import {
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assert,
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assertEquals,
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assertThrows,
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assertThrowsAsync,
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} from "../testing/asserts.ts";
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const { test } = Deno;
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import * as path from "../path/mod.ts";
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import {
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FormFile,
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MultipartReader,
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MultipartWriter,
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isFormFile,
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@ -173,46 +171,93 @@ test(async function multipartMultipartWriter3(): Promise<void> {
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);
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});
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test(async function multipartMultipartReader(): Promise<void> {
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// FIXME: path resolution
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const o = await open(path.resolve("./mime/testdata/sample.txt"));
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const mr = new MultipartReader(
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o,
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"--------------------------434049563556637648550474"
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);
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const form = await mr.readForm(10 << 20);
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assertEquals(form["foo"], "foo");
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assertEquals(form["bar"], "bar");
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const file = form["file"] as FormFile;
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assertEquals(isFormFile(file), true);
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assert(file.content !== void 0);
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o.close();
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test({
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name: "[mime/multipart] readForm() basic",
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async fn() {
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const o = await open(path.resolve("./mime/testdata/sample.txt"));
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const mr = new MultipartReader(
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o,
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"--------------------------434049563556637648550474"
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);
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const form = await mr.readForm();
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assertEquals(form.value("foo"), "foo");
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assertEquals(form.value("bar"), "bar");
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const file = form.file("file");
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assert(isFormFile(file));
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assert(file.content !== void 0);
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o.close();
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},
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});
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test(async function multipartMultipartReader2(): Promise<void> {
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const o = await open(path.resolve("./mime/testdata/sample.txt"));
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const mr = new MultipartReader(
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o,
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"--------------------------434049563556637648550474"
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);
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const form = await mr.readForm(20); //
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try {
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assertEquals(form["foo"], "foo");
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assertEquals(form["bar"], "bar");
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const file = form["file"] as FormFile;
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assertEquals(file.type, "application/octet-stream");
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assert(file.tempfile != null);
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const f = await open(file.tempfile);
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const w = new StringWriter();
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await copy(w, f);
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const json = JSON.parse(w.toString());
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assertEquals(json["compilerOptions"]["target"], "es2018");
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f.close();
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} finally {
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const file = form["file"] as FormFile;
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if (file.tempfile) {
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await remove(file.tempfile);
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test({
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name: "[mime/multipart] readForm() should store big file in temp file",
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async fn() {
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const o = await open(path.resolve("./mime/testdata/sample.txt"));
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const mr = new MultipartReader(
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o,
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"--------------------------434049563556637648550474"
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);
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// use low-memory to write "file" into temp file.
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const form = await mr.readForm(20);
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try {
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assertEquals(form.value("foo"), "foo");
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assertEquals(form.value("bar"), "bar");
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const file = form.file("file");
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assert(file != null);
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assertEquals(file.type, "application/octet-stream");
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assert(file.tempfile != null);
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const f = await open(file.tempfile);
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const w = new StringWriter();
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await copy(w, f);
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const json = JSON.parse(w.toString());
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assertEquals(json["compilerOptions"]["target"], "es2018");
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f.close();
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} finally {
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await form.removeAll();
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o.close();
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}
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o.close();
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}
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},
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});
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test({
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name: "[mime/multipart] removeAll() should remove all tempfiles",
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async fn() {
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const o = await open(path.resolve("./mime/testdata/sample.txt"));
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const mr = new MultipartReader(
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o,
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"--------------------------434049563556637648550474"
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);
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const form = await mr.readForm(20);
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const file = form.file("file");
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assert(file != null);
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const { tempfile, content } = file;
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assert(tempfile != null);
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assert(content == null);
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const stat = await Deno.stat(tempfile);
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assertEquals(stat.size, file.size);
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await form.removeAll();
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await assertThrowsAsync(async () => {
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await Deno.stat(tempfile);
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}, Deno.errors.NotFound);
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o.close();
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},
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});
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test({
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name: "[mime/multipart] entries()",
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async fn() {
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const o = await open(path.resolve("./mime/testdata/sample.txt"));
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const mr = new MultipartReader(
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o,
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"--------------------------434049563556637648550474"
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);
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const form = await mr.readForm();
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const map = new Map(form.entries());
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assertEquals(map.get("foo"), "foo");
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assertEquals(map.get("bar"), "bar");
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const file = map.get("file");
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assert(isFormFile(file));
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assertEquals(file.filename, "tsconfig.json");
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o.close();
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},
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});
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