[Event] New Event Bad Image and Tell Customer why their image is Bad about haxel-eventbrite HOT 4 CLOSED

For "judge whether the url is valid" and "return the error" commit 1e1ab4a has solved this

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@jerryhe16 Can you help with "judge whether the image is valid" with the function "isValidImageURL"
https://github.com/yale-mgt-656-fall-2023/project-starter-withered-horizon/blob/b32a32b3da389661ce802b6bf7e47b06ddab6846/event_controllers.go#L44

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As a user, I should upload images for the events but i get told if my image is not valid

Acceptance Criteria for Valid URL:

1. If a user attempts to submit an image URL, the system should validate whether the provided URL is correctly formatted.

2. The URL should start with "http://" or "https://".

3. The URL should contain valid characters and symbols for a web URL.

4. If the URL is not valid, the user should be shown an error message on the form, indicating that the URL is not correctly formatted, and they should be prompted to correct it.

Acceptance Criteria for Valid Image Type:

1. After the system confirms that the URL is valid, it should proceed to access the image file from the provided URL.

2. The system should check the file type of the image, which can be one of the following: ".png", ".jpg", ".jpeg", ".gif", or ".gifv."

3. If the image's file type is not one of the accepted types, the user should be shown an error message on the form, indicating that the image type is not supported, and they should be prompted to provide an image with one of the specified file types.

Acceptance Criteria for Returning the Error:

1. If either the URL is invalid or the image file type is not supported, the system should return the user to the form without losing any previously entered data.

2. The URL input field should still contain the previously entered URL (if valid), and the user's other form inputs (if any) should also remain intact.

3. The system should display a clear and user-friendly error message near the URL input field, indicating the specific reason for the error (e.g., invalid URL format or unsupported image type).

4. The error message should advise the user on how to rectify the issue, such as providing a valid URL or using an image with the accepted file types.

5. The user should have the opportunity to make the necessary corrections and resubmit the form.

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commit 2cb288a solve this issue by "judge whether the image is valid" with the function "isValidImageURL"

from haxel-eventbrite.