implement fetching data urls (#4000)

* fetch data urls

* `byteSlice`

* deinit slice

* allocate `mime_type` string if needed

* `content_type_allocated` and uncomment tests

* `str_`

* createAtom and slice decode result

1 files changed, 109 insertions, 0 deletions

diff --git a/test/js/web/fetch/fetch.test.ts b/test/js/web/fetch/fetch.test.ts
index a1585ba14..a381cb320 100644
--- a/test/js/web/fetch/fetch.test.ts
+++ b/test/js/web/fetch/fetch.test.ts
@@ -38,6 +38,115 @@ it("new Request(invalid url) throws", () => {
   expect(() => new Request("!")).toThrow();
 });
 
+describe("fetch data urls", () => {
+  it("basic", async () => {
+    var url =
+      "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==";
+
+    var res = await fetch(url);
+    expect(res.status).toBe(200);
+    expect(res.statusText).toBe("OK");
+    expect(res.ok).toBe(true);
+
+    var blob = await res.blob();
+    expect(blob.size).toBe(85);
+    expect(blob.type).toBe("image/png");
+  });
+  it("percent encoded", async () => {
+    var url = "data:text/plain;base64,SGVsbG8sIFdvcmxkIQ%3D%3D";
+    var res = await fetch(url);
+    expect(res.status).toBe(200);
+    expect(res.statusText).toBe("OK");
+    expect(res.ok).toBe(true);
+
+    var blob = await res.blob();
+    expect(blob.size).toBe(13);
+    expect(blob.type).toBe("text/plain;charset=utf-8");
+    expect(blob.text()).resolves.toBe("Hello, World!");
+  });
+  it("percent encoded (invalid)", async () => {
+    var url = "data:text/plain;base64,SGVsbG8sIFdvcmxkIQ%3D%3";
+    expect(async () => {
+      await fetch(url);
+    }).toThrow("failed to fetch the data URL");
+  });
+  it("plain text", async () => {
+    var url = "data:,Hello%2C%20World!";
+    var res = await fetch(url);
+    expect(res.status).toBe(200);
+    expect(res.statusText).toBe("OK");
+    expect(res.ok).toBe(true);
+
+    var blob = await res.blob();
+    expect(blob.size).toBe(13);
+    expect(blob.type).toBe("text/plain;charset=utf-8");
+    expect(blob.text()).resolves.toBe("Hello, World!");
+
+    url = "data:,helloworld!";
+    res = await fetch(url);
+    expect(res.status).toBe(200);
+    expect(res.statusText).toBe("OK");
+    expect(res.ok).toBe(true);
+
+    blob = await res.blob();
+    expect(blob.size).toBe(11);
+    expect(blob.type).toBe("text/plain;charset=utf-8");
+    expect(blob.text()).resolves.toBe("helloworld!");
+  });
+  it("data url (invalid)", async () => {
+    var url = "data:Hello%2C%20World!";
+    expect(async () => {
+      await fetch(url);
+    }).toThrow("failed to fetch the data URL");
+  });
+  it("emoji", async () => {
+    var url = "data:,😀";
+
+    var res = await fetch(url);
+    expect(res.status).toBe(200);
+    expect(res.statusText).toBe("OK");
+    expect(res.ok).toBe(true);
+
+    var blob = await res.blob();
+    expect(blob.size).toBe(4);
+    expect(blob.type).toBe("text/plain;charset=utf-8");
+    expect(blob.text()).resolves.toBe("😀");
+  });
+  it("should work with Request", async () => {
+    var req = new Request("data:,Hello%2C%20World!");
+    var res = await fetch(req);
+    expect(res.status).toBe(200);
+    expect(res.statusText).toBe("OK");
+    expect(res.ok).toBe(true);
+
+    var blob = await res.blob();
+    expect(blob.size).toBe(13);
+    expect(blob.type).toBe("text/plain;charset=utf-8");
+    expect(blob.text()).resolves.toBe("Hello, World!");
+
+    req = new Request("data:,😀");
+    res = await fetch(req);
+    expect(res.status).toBe(200);
+    expect(res.statusText).toBe("OK");
+    expect(res.ok).toBe(true);
+
+    blob = await res.blob();
+    expect(blob.size).toBe(4);
+    expect(blob.type).toBe("text/plain;charset=utf-8");
+    expect(blob.text()).resolves.toBe("😀");
+  });
+  it("should work with Request (invalid)", async () => {
+    var req = new Request("data:Hello%2C%20World!");
+    expect(async () => {
+      await fetch(req);
+    }).toThrow("failed to fetch the data URL");
+    req = new Request("data:Hello%345632");
+    expect(async () => {
+      await fetch(req);
+    }).toThrow("failed to fetch the data URL");
+  });
+});
+
 describe("AbortSignal", () => {
   beforeEach(() => {
     startServer({