First draft of Clojure implementation

platform/clojure/mailchecker.clj

@@ -0,0 +1,79 @@
+(ns mailchecker)
+
+(require '[clojure.string :as str])
+
+(def ^:const blacklist (set ["a", "b"]))
+
+; Copied from https://github.com/scstarkey/noir/blob/998e846dd44f42b8e01a6977e6d22a3eff5e4542/src/noir/validation.clj#L37-L40
+(defn is-email?
+  "Returns true if email is an email address"
+  [email]
+  (re-matches #"(?i)[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?" email))
+
+(defn at-split
+  "Returns list from string splitted on @ char"
+  [email]
+  (str/split email #"@"))
+
+(defn last-element
+  "Returns the last element of the arr"
+  [arr]
+  (first
+    (take-last 1 arr)))
+
+(defn domain-part
+  "Returns the domain part from email"
+  [email]
+  (last-element (at-split email)))
+
+(defn dot-join
+  "Returns string from arr joined with dot char"
+  [arr]
+  (str/join "." arr))
+
+(defn dot-split
+  "Returns list from string splitted on dot char"
+  [string]
+  (str/split string #"\."))
+
+(defn top-domain-part
+  "Returns the top domain for email"
+  [email]
+  (dot-join
+    (take-last 2
+      (dot-split (domain-part email)))))
+
+(defn in-blacklist?
+  "Returns true if email domain is not in the blacklist"
+  [email]
+  (contains? blacklist (top-domain-part email)))
+
+(defn valid?
+  "Returns true if the email is valid"
+  [email]
+  (and
+    (is-email? email)
+    (not
+      (in-blacklist? email))))
+
+; (println (valid? "[email protected]"))
+; (println (valid? "example.com"))
+; (println (top-domain-part "[email protected]"))
+
+; Valid
+(println (valid? "[email protected]"))
+(println (valid? "[email protected]"))
+(println (valid? "[email protected]"))
+(println (valid? "[email protected]"))
+(println (valid? "[email protected]"))
+(println (valid? "[email protected]"))
+
+; Invalid
+(println (not (valid? "plopplop.com")))
+(println (not (valid? "my+ok@ok=plop.com")))
+(println (not (valid? "my,[email protected]")))
+
+(println (not (valid? "[email protected]")))
+(println (not (valid? "[email protected]")))
+(println (not (valid? "[email protected]")))
+(println (not (valid? "[email protected]")))

platform/clojure/mailchecker.tmpl.clj

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+(ns mailchecker)
+
+(require '[clojure.string :as str])
+
+(def ^:const blacklist (set [{{& listSTR }}]))
+
+; Copied from https://github.com/scstarkey/noir/blob/998e846dd44f42b8e01a6977e6d22a3eff5e4542/src/noir/validation.clj#L37-L40
+(defn is-email?
+  "Returns true if email is an email address"
+  [email]
+  (re-matches #"(?i)[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?" email))
+
+(defn at-split
+  "Returns list from string splitted on @ char"
+  [email]
+  (str/split email #"@"))
+
+(defn last-element
+  "Returns the last element of the arr"
+  [arr]
+  (first
+    (take-last 1 arr)))
+
+(defn domain-part
+  "Returns the domain part from email"
+  [email]
+  (last-element (at-split email)))
+
+(defn dot-join
+  "Returns string from arr joined with dot char"
+  [arr]
+  (str/join "." arr))
+
+(defn dot-split
+  "Returns list from string splitted on dot char"
+  [string]
+  (str/split string #"\."))
+
+(defn top-domain-part
+  "Returns the top domain for email"
+  [email]
+  (dot-join
+    (take-last 2
+      (dot-split (domain-part email)))))
+
+(defn in-blacklist?
+  "Returns true if email domain is not in the blacklist"
+  [email]
+  (contains? blacklist (top-domain-part email)))
+
+(defn valid?
+  "Returns true if the email is valid"
+  [email]
+  (and
+    (is-email? email)
+    (not
+      (in-blacklist? email))))
+
+; (println (valid? "[email protected]"))
+; (println (valid? "example.com"))
+; (println (top-domain-part "[email protected]"))
+
+; Valid
+(println (valid? "[email protected]"))
+(println (valid? "[email protected]"))
+(println (valid? "[email protected]"))
+(println (valid? "[email protected]"))
+(println (valid? "[email protected]"))
+(println (valid? "[email protected]"))
+
+; Invalid
+(println (not (valid? "plopplop.com")))
+(println (not (valid? "my+ok@ok=plop.com")))
+(println (not (valid? "my,[email protected]")))
+
+(println (not (valid? "[email protected]")))
+(println (not (valid? "[email protected]")))
+(println (not (valid? "[email protected]")))
+(println (not (valid? "[email protected]")))