1 files changed, 318 insertions, 0 deletions
diff --git a/server/monitor-conditions/operators.js b/server/monitor-conditions/operators.js
new file mode 100644
index 0000000..d900dff
--- /dev/null
+++ b/server/monitor-conditions/operators.js
@@ -0,0 +1,318 @@
+class ConditionOperator {
+    id = undefined;
+    caption = undefined;
+
+    /**
+     * @type {mixed} variable
+     * @type {mixed} value
+     */
+    test(variable, value) {
+        throw new Error("You need to override test()");
+    }
+}
+
+const OP_STR_EQUALS = "equals";
+
+const OP_STR_NOT_EQUALS = "not_equals";
+
+const OP_CONTAINS = "contains";
+
+const OP_NOT_CONTAINS = "not_contains";
+
+const OP_STARTS_WITH = "starts_with";
+
+const OP_NOT_STARTS_WITH = "not_starts_with";
+
+const OP_ENDS_WITH = "ends_with";
+
+const OP_NOT_ENDS_WITH = "not_ends_with";
+
+const OP_NUM_EQUALS = "num_equals";
+
+const OP_NUM_NOT_EQUALS = "num_not_equals";
+
+const OP_LT = "lt";
+
+const OP_GT = "gt";
+
+const OP_LTE = "lte";
+
+const OP_GTE = "gte";
+
+/**
+ * Asserts a variable is equal to a value.
+ */
+class StringEqualsOperator extends ConditionOperator {
+    id = OP_STR_EQUALS;
+    caption = "equals";
+
+    /**
+     * @inheritdoc
+     */
+    test(variable, value) {
+        return variable === value;
+    }
+}
+
+/**
+ * Asserts a variable is not equal to a value.
+ */
+class StringNotEqualsOperator extends ConditionOperator {
+    id = OP_STR_NOT_EQUALS;
+    caption = "not equals";
+
+    /**
+     * @inheritdoc
+     */
+    test(variable, value) {
+        return variable !== value;
+    }
+}
+
+/**
+ * Asserts a variable contains a value.
+ * Handles both Array and String variable types.
+ */
+class ContainsOperator extends ConditionOperator {
+    id = OP_CONTAINS;
+    caption = "contains";
+
+    /**
+     * @inheritdoc
+     */
+    test(variable, value) {
+        if (Array.isArray(variable)) {
+            return variable.includes(value);
+        }
+
+        return variable.indexOf(value) !== -1;
+    }
+}
+
+/**
+ * Asserts a variable does not contain a value.
+ * Handles both Array and String variable types.
+ */
+class NotContainsOperator extends ConditionOperator {
+    id = OP_NOT_CONTAINS;
+    caption = "not contains";
+
+    /**
+     * @inheritdoc
+     */
+    test(variable, value) {
+        if (Array.isArray(variable)) {
+            return !variable.includes(value);
+        }
+
+        return variable.indexOf(value) === -1;
+    }
+}
+
+/**
+ * Asserts a variable starts with a value.
+ */
+class StartsWithOperator extends ConditionOperator {
+    id = OP_STARTS_WITH;
+    caption = "starts with";
+
+    /**
+     * @inheritdoc
+     */
+    test(variable, value) {
+        return variable.startsWith(value);
+    }
+}
+
+/**
+ * Asserts a variable does not start with a value.
+ */
+class NotStartsWithOperator extends ConditionOperator {
+    id = OP_NOT_STARTS_WITH;
+    caption = "not starts with";
+
+    /**
+     * @inheritdoc
+     */
+    test(variable, value) {
+        return !variable.startsWith(value);
+    }
+}
+
+/**
+ * Asserts a variable ends with a value.
+ */
+class EndsWithOperator extends ConditionOperator {
+    id = OP_ENDS_WITH;
+    caption = "ends with";
+
+    /**
+     * @inheritdoc
+     */
+    test(variable, value) {
+        return variable.endsWith(value);
+    }
+}
+
+/**
+ * Asserts a variable does not end with a value.
+ */
+class NotEndsWithOperator extends ConditionOperator {
+    id = OP_NOT_ENDS_WITH;
+    caption = "not ends with";
+
+    /**
+     * @inheritdoc
+     */
+    test(variable, value) {
+        return !variable.endsWith(value);
+    }
+}
+
+/**
+ * Asserts a numeric variable is equal to a value.
+ */
+class NumberEqualsOperator extends ConditionOperator {
+    id = OP_NUM_EQUALS;
+    caption = "equals";
+
+    /**
+     * @inheritdoc
+     */
+    test(variable, value) {
+        return variable === Number(value);
+    }
+}
+
+/**
+ * Asserts a numeric variable is not equal to a value.
+ */
+class NumberNotEqualsOperator extends ConditionOperator {
+    id = OP_NUM_NOT_EQUALS;
+    caption = "not equals";
+
+    /**
+     * @inheritdoc
+     */
+    test(variable, value) {
+        return variable !== Number(value);
+    }
+}
+
+/**
+ * Asserts a variable is less than a value.
+ */
+class LessThanOperator extends ConditionOperator {
+    id = OP_LT;
+    caption = "less than";
+
+    /**
+     * @inheritdoc
+     */
+    test(variable, value) {
+        return variable < Number(value);
+    }
+}
+
+/**
+ * Asserts a variable is greater than a value.
+ */
+class GreaterThanOperator extends ConditionOperator {
+    id = OP_GT;
+    caption = "greater than";
+
+    /**
+     * @inheritdoc
+     */
+    test(variable, value) {
+        return variable > Number(value);
+    }
+}
+
+/**
+ * Asserts a variable is less than or equal to a value.
+ */
+class LessThanOrEqualToOperator extends ConditionOperator {
+    id = OP_LTE;
+    caption = "less than or equal to";
+
+    /**
+     * @inheritdoc
+     */
+    test(variable, value) {
+        return variable <= Number(value);
+    }
+}
+
+/**
+ * Asserts a variable is greater than or equal to a value.
+ */
+class GreaterThanOrEqualToOperator extends ConditionOperator {
+    id = OP_GTE;
+    caption = "greater than or equal to";
+
+    /**
+     * @inheritdoc
+     */
+    test(variable, value) {
+        return variable >= Number(value);
+    }
+}
+
+const operatorMap = new Map([
+    [ OP_STR_EQUALS, new StringEqualsOperator ],
+    [ OP_STR_NOT_EQUALS, new StringNotEqualsOperator ],
+    [ OP_CONTAINS, new ContainsOperator ],
+    [ OP_NOT_CONTAINS, new NotContainsOperator ],
+    [ OP_STARTS_WITH, new StartsWithOperator ],
+    [ OP_NOT_STARTS_WITH, new NotStartsWithOperator ],
+    [ OP_ENDS_WITH, new EndsWithOperator ],
+    [ OP_NOT_ENDS_WITH, new NotEndsWithOperator ],
+    [ OP_NUM_EQUALS, new NumberEqualsOperator ],
+    [ OP_NUM_NOT_EQUALS, new NumberNotEqualsOperator ],
+    [ OP_LT, new LessThanOperator ],
+    [ OP_GT, new GreaterThanOperator ],
+    [ OP_LTE, new LessThanOrEqualToOperator ],
+    [ OP_GTE, new GreaterThanOrEqualToOperator ],
+]);
+
+const defaultStringOperators = [
+    operatorMap.get(OP_STR_EQUALS),
+    operatorMap.get(OP_STR_NOT_EQUALS),
+    operatorMap.get(OP_CONTAINS),
+    operatorMap.get(OP_NOT_CONTAINS),
+    operatorMap.get(OP_STARTS_WITH),
+    operatorMap.get(OP_NOT_STARTS_WITH),
+    operatorMap.get(OP_ENDS_WITH),
+    operatorMap.get(OP_NOT_ENDS_WITH)
+];
+
+const defaultNumberOperators = [
+    operatorMap.get(OP_NUM_EQUALS),
+    operatorMap.get(OP_NUM_NOT_EQUALS),
+    operatorMap.get(OP_LT),
+    operatorMap.get(OP_GT),
+    operatorMap.get(OP_LTE),
+    operatorMap.get(OP_GTE)
+];
+
+module.exports = {
+    OP_STR_EQUALS,
+    OP_STR_NOT_EQUALS,
+    OP_CONTAINS,
+    OP_NOT_CONTAINS,
+    OP_STARTS_WITH,
+    OP_NOT_STARTS_WITH,
+    OP_ENDS_WITH,
+    OP_NOT_ENDS_WITH,
+    OP_NUM_EQUALS,
+    OP_NUM_NOT_EQUALS,
+    OP_LT,
+    OP_GT,
+    OP_LTE,
+    OP_GTE,
+    operatorMap,
+    defaultStringOperators,
+    defaultNumberOperators,
+    ConditionOperator,
+};