Add support to multiple validate_claims constraints

lib/resty/libjwt/utils.lua

@@ -76,6 +76,22 @@ function _M.validate_claims(validate_claims, claims)
     if not validate_claims then
         return ""
     end
+
+    if _M.is_array(validate_claims) then
+        local errors = {}
+        for i, v in ipairs(validate_claims) do
+
+            local result = _M.validate_claims(v, claims)
+            if result == "" then
+                return ""
+            end
+
+            table.insert(errors, "validate_claims constraint number " .. i .. ": " .. result)
+        end
+
+        return table.concat(errors, " OR ")
+    end
+
     for claim_name, validation in pairs(validate_claims) do
         local claim_value = claims[claim_name]
         if claim_value == nil then
@@ -107,4 +123,13 @@ function _M.validate_claims(validate_claims, claims)
     return ""
 end
 
+function _M.is_array(t)
+    local i = 0
+    for _ in pairs(t) do
+        i = i + 1
+        if t[i] == nil then return false end
+    end
+    return true
+end
+
 return _M

test/validate_claims_test.lua

@@ -66,4 +66,40 @@ function TestShouldReturnOkInValidation()
     lu.assertEquals(err, "")
 end
 
+function TestShouldSupportArray()
+    local params = {
+        {
+            iss = {exact = "tsuru"},
+            aud = {one_of = {"audience1", "audience2"}},
+            sub = {pattern = ".*@g%.globo"}
+        }, {
+            iss = {exact = "kubernetes"},
+            aud = {one_of = {"audience3", "audience4"}},
+            sub = {pattern = ".*@corp%.globo%.com"}
+        }
+    }
+    local claims = {
+        iss = "tsuru",
+        aud = "audience1",
+        sub = "[email protected]"
+    }
+    local err
+    err = utils.validate_claims(params, claims)
+    lu.assertEquals(err, "")
+
+    claims = {
+        iss = "kubernetes",
+        aud = "audience4",
+        sub = "[email protected]"
+    }
+    err = utils.validate_claims(params, claims)
+    lu.assertEquals(err, "")
+
+    claims = {iss = "tsuru", aud = "audience4", sub = "[email protected]"}
+    err = utils.validate_claims(params, claims)
+    lu.assertEquals(err,
+                    "validate_claims constraint number 1: Claim 'aud' must be one of the allowed values OR " ..
+                        "validate_claims constraint number 2: Claim 'iss' must be exactly 'kubernetes'")
+end
+
 os.exit(lu.LuaUnit.run())