Added handling disallow_attester_search_for_domains OrgRule

[DenBond7]

This PR added handling disallow_attester_search_for_domains OrgRule

close #1203

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Tests (delete all except exactly one):

• Tests added or updated

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To be filled by reviewers

I have reviewed that this PR... (tick whichever items you personally focused on during this review):

• addresses the issue it closes (if any)
• code is readable and understandable
• is accompanied with tests, or tests are not needed
• is free of vulnerabilities

[IvanPizhenko]

I have a question

[IvanPizhenko]

doesn't this require sort of case-insensitive comparison?

[DenBond7]

This realization is based on https://github.com/FlowCrypt/flowcrypt-browser/blob/48cb02a244b71a2acffbbc0fdb6ed4254baa0da3/extension/js/common/org-rules.ts#L170-L192.

Does include mean case-insensitive comparison?

[IvanPizhenko]

In typescript we have:

  public canLookupThisRecipientOnAttester = (emailAddr: string): boolean => {
    ....
    const userDomain = Str.getDomainFromEmailAddress(emailAddr);
    if (!userDomain) {
      throw new Error(`Not a valid email ${emailAddr}`);
    }
    return !disallowedDomains.includes(userDomain);
  }

and then:

  public static getDomainFromEmailAddress = (emailAddr: string) => {
    // todo: parseEmail()?
    return emailAddr.toLowerCase().split('@')[1];
  }

So function for getting domain in the typescript casts it to lowercase and then if you configure everything in lowercase, all works.
In Kotlin that doesn't happen:

    // from EmailUtil.kt
    fun getDomain(email: String): String {
      return when {
        TextUtils.isEmpty(email) -> ""
        email.contains("@") -> email.substring(email.indexOf('@') + 1)
        else -> ""
      }
    }

[DenBond7]

I see. Thank you. I will fix it.

[tomholub]

Well noticed, Ivan - thank you.