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url-list-validation-91f3768.md

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URL List Validation

The OpenUI5 framework provides a client-side API to manage allowed URLs using the URLListValidator. It can be used to validate arbitrary URLs.

Internal examples of controls that use this feature are controls which accept arbitrary HTML content, such as sap.ui.core.HTML. This control uses the URLListValidator to perform a check (sanitization) on the content. URLs inside their content are then automatically removed, unless they are allowed by the URLListValidator. The option to sanitize the content can be enabled or disabled in the respective control via the property HTML.sanitizeContent. For the HTML control it is disabled by default. When adding a path to the allowed URLs in the URLListValidator, make sure to add "/" as path prefix if necessary, for example "/index.epx" instead of "index.epx". The last example below shows this.

Maintaining the URLListValidator

The allowed URLs can be maintained with the following API:

  • sap/base/security/URLListValidator.add

  • sap/base/security/URLListValidator.clear

  • sap/base/security/URLListValidator.entries

Here is an example how valid URLs can be allowed:

// URLListValidator required from module sap/base/security/URLListValidator

URLListValidator.add(undefined, "www.sap.com");

URLListValidator.add("https", "sdn.sap.com");

URLListValidator.add(undefined, "sap.de", "1080");

URLListValidator.add("https", "community.sap.de", undefined, "/topics");

Validating a URL

A URL can be validated by using the following API: sap/base/security/URLListValidator.validate.

Here is an example how a given URL is validated against the above-mentioned allowed URLs:

// URLListValidator required from module sap/base/security/URLListValidator

URLListValidator.validate("http://www.sap.com"); // => true

URLListValidator.validate("http://sdn.sap.com"); // => false (wrong protocol)

URLListValidator.validate("https://sdn.sap.com"); // => true

URLListValidator.validate("ftp://sap.de:1080/anyftppath"); // => true

URLListValidator.validate("https://community.sap.de/anypath"); // => false (wrong path)

URLListValidator.validate("https://community.sap.de/topics"); // => true

If no URL was added to the allowed URLs in the URLListValidator, the URL validity check also basically checks the URL for being defined in a valid format.