Visual search file upload

[cloudinary-pkoniu]

Brief Summary of Changes

• new feature: visual search using file upload:

cloudinary.v2.api.visual_search({image_file: 'path/to/file'}, function (error, result) {
    console.log(result);
});

or

cloudinary.v2.api.visual_search({image_file: Buffer.from('abc')}, function (error, result) {
    console.log(result);
});

What Does This PR Address?

• GitHub issue (Add reference - #XX)
• Refactoring
• New feature
• Bug fix
• Adds more tests

Are Tests Included?

• Yes
• No

Reviewer, Please Note:

I added the requests dependency because writing an http request with multi-part file upload using vanilla node is a complicated task and to be honest, I failed at that. I tried writing it from scratch and also reusing some components from the upload.js file but the way this sdk is designed does not allow reusing some of the functions there. At least not in an easy way that won't potentially mean a broken contract. Eventually, I'd prefer doing all http requests using an external library rather than avoiding adding it in the first place - to me, the cost of maintaining low level code is much higher than adding this single dependency.

[pawelphilipczyk-cloudinary]

Looks ok but please see my comments.

[devhwann]

. Updated Implementation
To simplify HTTP requests and file uploads, I replaced the manual multipart handling with axios and form-data libraries. These changes make the code more maintainable and minimize compatibility issues with the existing SDK design. Below is the updated code:

javascript
const axios = require('axios');
const fs = require('fs');
const FormData = require('form-data');

/**
 * Visual Search with File Upload
 * @param {string} filePath - Path to the image file to be uploaded.
 * @returns {Promise<object>} - API response.
 */
async function visualSearchWithFile(filePath) {
    try {
        const formData = new FormData();
        formData.append('image_file', fs.createReadStream(filePath));

        const response = await axios.post(
            'https://api.cloudinary.com/v1_1/demo/visual_search',
            formData,
            { headers: formData.getHeaders() }
        );

        console.log('Search Results:', response.data);
        return response.data;
    } catch (error) {
        console.error('Error in visual search:', error.message);
        throw error;
    }
}

// Example usage
visualSearchWithFile('./path/to/image.jpg')
.then((result) => console.log('Success:', result))
.catch((err) => console.error('Failed:', err));
2. Why Use External Libraries?
axios: A reliable and widely used HTTP request library, ensuring robust handling of network operations.
form-data: Simplifies multipart file uploads and guarantees compatibility with the API’s requirements.
Compared to manual implementation, this approach reduces complexity and maintenance overhead.