Add API Framework Revel Source Files

[iec.git] / src / foundation / api / revel / libs.go

diff --git a/src/foundation/api/revel/libs.go b/src/foundation/api/revel/libs.go
new file mode 100644 (file)
index 0000000..fb17178
--- /dev/null
+++ b/src/foundation/api/revel/libs.go
@@ -0,0 +1,86 @@
+// Copyright (c) 2012-2016 The Revel Framework Authors, All rights reserved.
+// Revel Framework source code and usage is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package revel
+
+import (
+       "crypto/hmac"
+       "crypto/sha1"
+       "encoding/hex"
+       "io"
+       "reflect"
+       "strings"
+)
+
+// Sign a given string with the app-configured secret key.
+// If no secret key is set, returns the empty string.
+// Return the signature in base64 (URLEncoding).
+func Sign(message string) string {
+       if len(secretKey) == 0 {
+               return ""
+       }
+       mac := hmac.New(sha1.New, secretKey)
+       if _, err := io.WriteString(mac, message); err != nil {
+               utilLog.Error("WriteString failed", "error", err)
+               return ""
+       }
+       return hex.EncodeToString(mac.Sum(nil))
+}
+
+// Verify returns true if the given signature is correct for the given message.
+// e.g. it matches what we generate with Sign()
+func Verify(message, sig string) bool {
+       return hmac.Equal([]byte(sig), []byte(Sign(message)))
+}
+
+// ToBool method converts/assert value into true or false. Default is true.
+// When converting to boolean, the following values are considered FALSE:
+// - The integer value is 0 (zero)
+// - The float value 0.0 (zero)
+// - The complex value 0.0 (zero)
+// - For string value, please refer `revel.Atob` method
+// - An array, map, slice with zero elements
+// - Boolean value returned as-is
+// - "nil" value
+func ToBool(val interface{}) bool {
+       if val == nil {
+               return false
+       }
+
+       v := reflect.ValueOf(val)
+       switch v.Kind() {
+       case reflect.Bool:
+               return v.Bool()
+       case reflect.String:
+               return Atob(v.String())
+       case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+               return v.Int() != 0
+       case reflect.Float32, reflect.Float64:
+               return v.Float() != 0.0
+       case reflect.Complex64, reflect.Complex128:
+               return v.Complex() != 0.0
+       case reflect.Array, reflect.Map, reflect.Slice:
+               return v.Len() != 0
+       }
+
+       // Return true by default
+       return true
+}
+
+// Atob converts string into boolean. It is in-case sensitive
+// When converting to boolean, the following values are considered FALSE:
+// - The "" (empty) string
+// - The "false" string
+// - The "f" string
+// - The "off" string,
+// - The string "0" & "0.0"
+func Atob(v string) bool {
+       switch strings.TrimSpace(strings.ToLower(v)) {
+       case "", "false", "off", "f", "0", "0.0":
+               return false
+       }
+
+       // Return true by default
+       return true
+}