feat: Add image upload support with file path handling (#8830)

* ✨ (data.py): introduce a new function get_file_paths to resolve file paths before creating image URLs in HumanMessage contents

* ✨ (general-bugs-agent-images-playground.spec.ts): add test case for user to send images in the playground with the agent component

* 📝 (general-bugs-agent-images-playground.spec.ts): update file path to image file to fix test failure due to incorrect file path

* [autofix.ci] apply automated fixes

* fix: autofix.ci / Update Starter Projects (pull_request)

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: italojohnny <italojohnnydosanjos@gmail.com>

src/frontend/tests/extended/regression/general-bugs-agent-images-playground.spec.ts

@@ -0,0 +1,92 @@
+import { expect, test } from "@playwright/test";
+import dotenv from "dotenv";
+import { readFileSync } from "fs";
+import path from "path";
+import { awaitBootstrapTest } from "../../utils/await-bootstrap-test";
+
+test(
+  "user must be able to send images in the playground with the agent component",
+  { tag: ["@release", "@components"] },
+  async ({ page }) => {
+    test.skip(
+      !process?.env?.ANTHROPIC_API_KEY,
+      "ANTHROPIC_API_KEY required to run this test",
+    );
+
+    if (!process.env.CI) {
+      dotenv.config({ path: path.resolve(__dirname, "../../.env") });
+    }
+    await awaitBootstrapTest(page);
+
+    await page.getByTestId("side_nav_options_all-templates").click();
+    await page.getByRole("heading", { name: "Simple Agent" }).first().click();
+
+    await page.getByTestId("value-dropdown-dropdown_str_agent_llm").click();
+
+    await page.waitForTimeout(200);
+
+    await page.getByText("Anthropic").last().click();
+
+    await page
+      .getByTestId("popover-anchor-input-api_key")
+      .fill(process.env.ANTHROPIC_API_KEY || "");
+
+    await page.getByTestId("playground-btn-flow-io").click();
+
+    // Read the image file as a binary string
+    const filePath = "tests/assets/chain.png";
+    const fileContent = readFileSync(filePath, "base64");
+
+    // Create the DataTransfer and File objects within the browser context
+    const dataTransfer = await page.evaluateHandle(
+      ({ fileContent }) => {
+        const dt = new DataTransfer();
+        const byteCharacters = atob(fileContent);
+        const byteNumbers = new Array(byteCharacters.length);
+        for (let i = 0; i < byteCharacters.length; i++) {
+          byteNumbers[i] = byteCharacters.charCodeAt(i);
+        }
+        const byteArray = new Uint8Array(byteNumbers);
+        const file = new File([byteArray], "chain.png", { type: "image/png" });
+        dt.items.add(file);
+        return dt;
+      },
+      { fileContent },
+    );
+
+    await page.waitForSelector('[data-testid="input-chat-playground"]', {
+      timeout: 100000,
+    });
+
+    // Locate the target element
+    const element = await page.getByTestId("input-chat-playground");
+
+    // Dispatch the drop event on the target element
+    await element.dispatchEvent("drop", { dataTransfer });
+
+    await page
+      .getByTestId("input-chat-playground")
+      .fill("tell me a small history about the image");
+
+    await page.waitForSelector('[data-testid="button-send"]', {
+      timeout: 100000,
+    });
+
+    await page.getByTestId("button-send").click();
+
+    await page.waitForSelector("text=chain.png", { timeout: 30000 });
+
+    await page.getByText("chain.png").isVisible();
+
+    await page.waitForTimeout(5000);
+
+    const textFromLlm = await page
+      .locator(".markdown.prose")
+      .last()
+      .textContent();
+
+    expect(textFromLlm?.toLowerCase()).toContain("chain");
+    const lengthOfTextFromLlm = textFromLlm?.length;
+    expect(lengthOfTextFromLlm).toBeGreaterThan(100);
+  },
+);