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[toandq2009]

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To fix the problem, we need to ensure that the origin parameter is validated against a list of authorized URLs before performing the redirect. This can be achieved by maintaining a list of trusted URLs and checking if the origin parameter matches any of these URLs. If it does not match, the redirect should not be performed.

1. Create a list of authorized URLs.
2. Check if the origin parameter is in the list of authorized URLs before performing the redirect.
3. If the origin parameter is not in the list, do not perform the redirect and show an appropriate error message.

To fix the problem, we need to ensure that the origin value is properly sanitized before it is used in the URL redirection. One way to achieve this is by using a library like DOMPurify to sanitize the origin value. This will help prevent any malicious scripts from being executed.

1. Install the DOMPurify library.
2. Import DOMPurify in the file.
3. Use DOMPurify to sanitize the origin value before using it in the URL redirection.

To fix the problem, we need to replace the substring "-" with the correct transformation. The intention seems to be to format the string res to include a "+" sign for positive values and retain the "-" sign for negative values. Therefore, we should ensure that the "+" sign is added correctly for positive values and the "-" sign is retained for negative values without unnecessary replacement.

• Identify the line with the problematic replacement: res.replace("-", "-").
• Replace this line with a conditional check to prepend a "+" sign for positive values and retain the "-" sign for negative values without using the replace method.