From fec4c96635f1b4c52749b7554eb3f1fdc8c3a4de Mon Sep 17 00:00:00 2001
From: Anton Mashkov <slonikmak@gmail.com>
Date: Sun, 12 Jan 2025 23:31:47 +0300
Subject: [PATCH] Resolved Homework-15

---
 otus-14/homework/project.clj                  |  11 +-
 otus-14/homework/spec.json                    |  23 ++++
 otus-14/homework/src/spec_faker/core.clj      |  95 ++++++++++++--
 .../src/spec_faker/data_generator.clj         | 118 ++++++++++++++++++
 .../src/spec_faker/schema_validator.clj       |  26 ++++
 otus-14/homework/test/spec_faker/test.clj     |  68 ++++++++++
 otus-14/project.clj                           |   4 +-
 7 files changed, 333 insertions(+), 12 deletions(-)
 create mode 100644 otus-14/homework/spec.json
 create mode 100644 otus-14/homework/src/spec_faker/data_generator.clj
 create mode 100644 otus-14/homework/src/spec_faker/schema_validator.clj
 create mode 100644 otus-14/homework/test/spec_faker/test.clj

diff --git a/otus-14/homework/project.clj b/otus-14/homework/project.clj
index 7742175..49dc7a9 100644
--- a/otus-14/homework/project.clj
+++ b/otus-14/homework/project.clj
@@ -2,14 +2,19 @@
   :description "A simple Web-app that can fake for you some data using your Swagger spec"
   :license {:name "EPL-2.0 OR GPL-2.0-or-later WITH Classpath-exception-2.0"
             :url "https://www.eclipse.org/legal/epl-2.0/"}
-  :dependencies [[org.clojure/clojure "1.10.1"]
+  :dependencies [[org.clojure/clojure "1.12.0"]
                  [ring/ring-core "1.10.0"]
                  [ring/ring-jetty-adapter "1.10.0"]
                  [ring/ring-defaults "0.3.4"]
+                 [ring/ring-devel "1.10.0"]
+                 [ring/ring-json "0.5.1"]
                  [compojure "1.7.0"]
                  [hiccup "1.0.5"]
-                 [cheshire "5.11.0"]]
+                 [org.clojure/test.check "1.1.1"]
+                 [cheshire "5.11.0"]
+                 [metosin/compojure-api "1.1.14"]]
   :main ^:skip-aot spec-faker.core
   :target-path "target/%s"
   :profiles {:uberjar {:aot :all
-                       :jvm-opts ["-Dclojure.compiler.direct-linking=true"]}})
+                       :jvm-opts ["-Dclojure.compiler.direct-linking=true"]}
+             :test     {:dependencies [[ring/ring-mock "0.4.0"]]}})
diff --git a/otus-14/homework/spec.json b/otus-14/homework/spec.json
new file mode 100644
index 0000000..f270e8a
--- /dev/null
+++ b/otus-14/homework/spec.json
@@ -0,0 +1,23 @@
+{
+  "type": "object",
+  "properties": {
+    "name": {
+      "type": "string",
+      "minLength": 3,
+      "maxLength": 50
+    },
+    "age": {
+      "type": "integer",
+      "minimum": 18,
+      "maximum": 99
+    },
+    "email": {
+      "type": "string",
+      "format": "email"
+    },
+    "is_active": {
+      "type": "boolean"
+    }
+  },
+  "required": ["name", "age", "email"]
+}
diff --git a/otus-14/homework/src/spec_faker/core.clj b/otus-14/homework/src/spec_faker/core.clj
index c412065..d73fe7b 100644
--- a/otus-14/homework/src/spec_faker/core.clj
+++ b/otus-14/homework/src/spec_faker/core.clj
@@ -1,13 +1,92 @@
 (ns spec-faker.core
   (:require [ring.adapter.jetty :refer [run-jetty]]
-            [compojure.core :refer :all]
-            [hiccup.core :refer [html]])
-  (:gen-class))
+            [cheshire.core :as json]
+            [compojure.api.sweet :refer :all]
+            [compojure.route :as route]
+            [spec-faker.schema-validator :refer [validate-schema explain-validation-error]]
+            [spec-faker.data-generator :refer [gen-example]]
+            [ring.util.http-response :refer :all]
+            [hiccup.core :refer [html]]
+            [schema.core :as s])
+  (:gen-class)
+  (:import (com.fasterxml.jackson.core JsonParseException)
+           (java.net URLEncoder)))
 
+;; Convert JSON string to EDN
+(defn json-to-edn [json-str]
+  (json/parse-string json-str true))
+
+(def bad-json-response
+  (bad-request {:error "Invalid JSON\n"}))
+
+(defn invalid-spec-response [decoded-spec]
+  (bad-request {:error (str "Invalid spec\n" (explain-validation-error decoded-spec))}))
+
+(def input-form-response
+  (html
+    [:html
+     [:head [:title "Spec Faker"]]
+     [:body
+      [:h1 "Insert OpenAPI specification"]
+      [:form {:method "post" :action "/"}
+       [:textarea {:name "spec" :rows 10 :cols 50}]
+       [:br]
+       [:input {:type "submit" :value "Generate"}]]]]))
+
+(defn gen-data-response [spec]
+  (let [decoded-spec (json-to-edn spec)]
+    (if (validate-schema decoded-spec)
+      (ok (gen-example decoded-spec))
+      (invalid-spec-response decoded-spec))))
+
+(defn redirect-response [spec-json]
+  (see-other (str "/?spec=" (URLEncoder/encode ^String spec-json "UTF-8"))))
+
+(defn invalid-spec-form-response [spec-json]
+  (let [decoded-spec (json-to-edn spec-json)]
+    (bad-request {:error (str "Invalid Swagger spec: " (explain-validation-error decoded-spec))})))
+
+
+;; Define the API
+(defapi app
+  {:swagger {:ui "/swagger-ui"
+             :spec "/swagger.json"
+             :data {:info {:title "Spec Faker API"
+                           :description "Generate example data from OpenAPI specifications"}
+                    :tags [{:name "faker" :description "APIs for generating example data"}]}}}
+
+  (context "/" []
+    :tags ["faker"]
+
+    ; GET endpoint to fetch form or generate data
+    (GET "/" []
+      :query-params [{spec :- (s/maybe s/Str) nil}]
+      (if spec
+        (try
+          (gen-data-response spec)
+          (catch JsonParseException _ bad-json-response))
+        (content-type (ok input-form-response) "text/html")))
+
+
+    ;; POST endpoint to validate and process spec
+    (POST "/" []
+      :form-params [spec :- s/Str]
+      :return {:redirect s/Str}
+      (try
+        (if (validate-schema (json-to-edn spec))
+          (redirect-response spec)
+          (invalid-spec-form-response spec))
+        (catch JsonParseException _ bad-json-response))))
+
+  (undocumented
+    (ANY "*" []
+      (not-found "Not Found"))))
+
+(comment
+  (run-jetty #'app {:join? false
+                    :port  8000}))
+
+;; Start the server
 (defn -main
   [& args]
-  (run-jetty
-   (routes
-    (GET "/" []
-      (html [:h1 "Hello World!"])))
-   {:port 8000}))
+  (run-jetty app {:port 8000 :join? false}))
\ No newline at end of file
diff --git a/otus-14/homework/src/spec_faker/data_generator.clj b/otus-14/homework/src/spec_faker/data_generator.clj
new file mode 100644
index 0000000..972e168
--- /dev/null
+++ b/otus-14/homework/src/spec_faker/data_generator.clj
@@ -0,0 +1,118 @@
+(ns spec-faker.data-generator
+  (:require [clojure.test.check.generators :as gen]))
+
+(defn gen-integer
+  "Генерирует целое число в интервале [min, max], если указаны.
+   Если min/max не указаны, применяем некий разумный диапазон по умолчанию."
+  [schema]
+  (let [minimum (:minimum schema 0)
+        maximum (:maximum schema Integer/MAX_VALUE)]
+    (gen/choose minimum maximum)))
+
+(defn gen-boolean
+  "Генерирует случайное boolean-значение."
+  []
+  gen/boolean)
+
+(defn gen-random-string
+  "Вспомогательная функция: генерирует строку из букв/цифр ограниченной длины.
+   При необходимости усечёт строку до max-length."
+  [min-len max-len]
+  (gen/fmap
+    (fn [s]
+      (let [cut (subs s 0 (min max-len (count s)))]
+        cut))
+    (gen/such-that #(>= (count %) min-len) gen/string-alphanumeric)))
+
+(defn gen-email
+  "Простейший генератор email-адреса. Игнорируем minLength/maxLength,
+   но по желанию можно усложнить формат."
+  [min-len max-len]
+  (gen/fmap
+    (fn [[user domain tld]]
+      (let [email (str user "@" domain "." tld)]
+        (subs email 0 (min (count email) max-len))))
+    (gen/tuple
+      (gen/such-that #(>= (count %) (max 1 (dec min-len))) gen/string-alphanumeric)
+      (gen/such-that #(pos? (count %)) gen/string-alphanumeric)
+      (gen/elements ["com" "org" "net" "ru" "test"]))))
+
+(defn gen-string
+  "Генерирует строку с учётом minLength, maxLength и формата (например, email)."
+  [schema]
+  (let [min-length (or (get schema :minLength) 0)
+        max-length (or (get schema :maxLength) (max 10 min-length)) ; чтобы max >= min
+        format     (get schema :format)]
+    (case format
+      "email" (gen-email min-length max-length)
+      (gen-random-string min-length max-length))))
+
+(defn gen-object
+  "Принимает карту (properties) вида {\"propertyName\" propertySchema, ...}
+   Возвращает генератор, создающий Clojure map:
+   {:propertyName <случайное значение>}."
+  [properties]
+  (let [
+        prop-gens
+        (map
+          (fn [[prop-name prop-spec]]
+            (let [t (:type prop-spec)]
+              [prop-name
+               (case t
+                 "integer" (gen-integer prop-spec)
+                 "boolean" (gen-boolean)
+                 "string"  (gen-string prop-spec)
+                 (gen/return nil))]))
+          properties)]
+    (apply gen/hash-map (mapcat identity prop-gens))))
+
+(defn gen-schema
+  "Рекурсивно обходит schema и возвращает генератор данных для неё."
+  [schema]
+  (let [t (:type schema)]
+    (case t
+      "object"
+      (let [props (:properties schema {})]
+        (gen-object props))
+
+      "integer"
+      (gen-integer schema)
+
+      "boolean"
+      (gen-boolean)
+
+      "string"
+      (gen-string schema)
+
+      (gen/return nil))))
+
+(defn gen-example
+  ([schema count]
+   (gen/sample (gen-schema schema) count))
+  ([schema]
+   (first (gen-example schema 1))))
+
+
+
+(def example-spec
+  {:type "object"
+   :properties
+   {:age      {:type "integer" :minimum 18 :maximum 80}
+    :email    {:type "string" :format "email" :minLength 6 :maxLength 30}
+    :isActive {:type "boolean"}
+    :nickname {:type "string" :minLength 3 :maxLength 10}}})
+
+(comment
+  (let [gen-example (gen-schema example-spec)]
+    (doseq [value (gen/sample gen-example 1)]
+      (prn value))))
+
+(comment
+  (gen/sample (gen-schema example-spec) 1)
+  (gen/sample (gen-integer {:minimum 10 :maximum 300}) 1)
+  (gen/sample (gen-random-string 2 10))
+  (gen/sample gen/string-alphanumeric 5)
+  (gen/sample (gen/such-that #(>= (count %) 2) gen/string-alphanumeric) 5)
+  (gen/sample (gen-string {:minLength 3 :maxLength 10}))
+  (gen/vector gen/char-alphanumeric 2 4)
+  )
diff --git a/otus-14/homework/src/spec_faker/schema_validator.clj b/otus-14/homework/src/spec_faker/schema_validator.clj
new file mode 100644
index 0000000..44cd156
--- /dev/null
+++ b/otus-14/homework/src/spec_faker/schema_validator.clj
@@ -0,0 +1,26 @@
+(ns spec-faker.schema-validator
+  (:require [clojure.spec.alpha :as s]))
+
+(s/def ::type #{"string" "integer" "boolean" "object"})
+(s/def ::format (s/nilable #{"email" "uuid"}))
+(s/def ::minLength pos-int?)
+(s/def ::maxLength pos-int?)
+(s/def ::minimum number?)
+(s/def ::maximum number?)
+
+(s/def ::property
+  (s/keys :req-un [::type]
+          :opt-un [::format ::minLength ::maxLength ::minimum ::maximum]))
+
+(s/def ::properties (s/map-of keyword? ::property))
+(s/def ::required (s/coll-of string? :kind vector?))
+
+(s/def ::openapi-schema
+  (s/keys :req-un [::type ::properties]
+          :opt-un [::required]))
+
+(defn validate-schema [schema]
+  (s/valid? ::openapi-schema schema))
+
+(defn explain-validation-error [schema]
+  (s/explain-str ::openapi-schema schema))
\ No newline at end of file
diff --git a/otus-14/homework/test/spec_faker/test.clj b/otus-14/homework/test/spec_faker/test.clj
new file mode 100644
index 0000000..90acddf
--- /dev/null
+++ b/otus-14/homework/test/spec_faker/test.clj
@@ -0,0 +1,68 @@
+(ns spec-faker.test
+  (:require [clojure.test :refer :all]
+            [ring.mock.request :as mock]
+            [spec-faker.core :refer [app]])
+  (:import (java.net URLEncoder)))
+
+(deftest test-get-root
+  (testing "GET / without spec"
+    (let [response (app (mock/request :get "/"))]
+      (is (= 200 (:status response)))
+      (is (.contains (:body response) "Insert OpenAPI specification")))))
+
+(deftest test-get-with-spec
+  (testing "GET / with valid spec"
+    (let [spec "{\"type\":\"object\",\"properties\":{\"name\":{\"type\":\"string\"}}}"
+          response (app (mock/request :get "/" {:spec spec}))
+          body (slurp (:body response))]
+      (is (= 200 (:status response)))
+      (is (.contains body "\"name\""))))
+
+  (testing "GET / with invalid spec"
+    (let [spec "{\"type\":\"invalid\"}"
+          response (app (mock/request :get "/" {:spec spec}))
+          body (slurp (:body response))]
+      (is (= 400 (:status response)))
+      (is (.contains body "Invalid spec"))))
+
+  (testing "GET / with invalid JSON"
+    (let [spec "{\"type\":\"object\",\"properties\":{\"name\"}"
+          response (app (mock/request :get "/" {:spec spec}))
+          body (slurp (:body response))]
+      (is (= 400 (:status response)))
+      (is (.contains body "Invalid JSON")))))
+
+(deftest test-post-root
+  (testing "POST / with valid spec"
+    (let [spec "{\"type\":\"object\",\"properties\":{\"name\":{\"type\":\"string\"}}}"
+          response (app (-> (mock/request :post "/")
+                            (mock/content-type "application/x-www-form-urlencoded")
+                            (mock/body (str "spec=" (URLEncoder/encode spec "UTF-8")))))]
+      (is (= 303 (:status response)))
+      (is (= (str "/?spec=" (URLEncoder/encode spec "UTF-8"))
+             (get-in response [:headers "Location"])))))
+
+  (testing "POST / with invalid spec"
+    (let [spec "{\"type\":\"invalid\"}"
+          response (app (-> (mock/request :post "/")
+                            (mock/content-type "application/x-www-form-urlencoded")
+                            (mock/body (str "spec=" (URLEncoder/encode spec "UTF-8")))))
+          body (slurp (:body response))]
+      (is (= 400 (:status response)))
+      (is (.contains body "Invalid Swagger spec"))))
+
+  (testing "POST / with invalid JSON"
+    (let [spec "{\"type\":\"object\",\"properties\":{\"name\"}"
+          response (app (-> (mock/request :post "/")
+                            (mock/content-type "application/x-www-form-urlencoded")
+                            (mock/body (str "spec=" (URLEncoder/encode spec "UTF-8")))))
+          body (slurp (:body response))]
+      (is (= 400 (:status response)))
+      (is (.contains body "Invalid JSON")))))
+
+
+(deftest test-not-found
+  (testing "GET /unknown"
+    (let [response (app (mock/request :get "/unknown"))]
+      (is (= 404 (:status response)))
+      (is (= "Not Found" (:body response))))))
\ No newline at end of file
diff --git a/otus-14/project.clj b/otus-14/project.clj
index c29b888..7831cd5 100644
--- a/otus-14/project.clj
+++ b/otus-14/project.clj
@@ -3,14 +3,16 @@
   :url "http://example.com/FIXME"
   :license {:name "EPL-2.0 OR GPL-2.0-or-later WITH Classpath-exception-2.0"
             :url "https://www.eclipse.org/legal/epl-2.0/"}
-  :dependencies [[org.clojure/clojure "1.10.1"]
+  :dependencies [[org.clojure/clojure "1.12.0"]
                  [ring/ring-core "1.10.0"]
                  [ring/ring-devel "1.10.0"]
                  [ring/ring-jetty-adapter "1.10.0"]
                  [ring/ring-defaults "0.3.4"]
                  [compojure "1.7.0"]
                  [hiccup "1.0.5"]
+                 [org.clojure/test.check "1.1.1"]
                  [cheshire "5.11.0"]]
+  :modules {:dirs ["homework"]}
   :main ^:skip-aot otus-14.core
   :target-path "target/%s"
   :profiles {:uberjar {:aot :all