implement unmarshaling straight into MethodData

app/v1/friend.go

@@ -2,7 +2,6 @@ package v1
 
 import (
 	"database/sql"
-	"encoding/json"
 	"strconv"
 	"time"
 
@@ -149,7 +148,7 @@ type friendAddPOSTData struct {
 // FriendsAddPOST allows for adding friends. Yup. Easy as that.
 func FriendsAddPOST(md common.MethodData) (r common.Response) {
 	d := friendAddPOSTData{}
-	err := json.Unmarshal(md.RequestData, &d)
+	err := md.RequestData.Unmarshal(&d)
 	if err != nil {
 		md.Err(err)
 		r = Err500
@@ -220,7 +219,7 @@ func FriendsDelGET(md common.MethodData) common.Response {
 // FriendsDelPOST allows for deleting friends.
 func FriendsDelPOST(md common.MethodData) (r common.Response) {
 	d := friendAddPOSTData{}
-	err := json.Unmarshal(md.RequestData, &d)
+	err := md.RequestData.Unmarshal(&d)
 	if err != nil {
 		md.Err(err)
 		r = Err500

app/v1/token.go

@@ -3,7 +3,6 @@ package v1
 import (
 	"crypto/md5"
 	"database/sql"
-	"encoding/json"
 	"fmt"
 
 	"github.com/osuripple/api/common"
@@ -31,7 +30,7 @@ type tokenNewOutData struct {
 // TokenNewPOST is the handler for POST /token/new.
 func TokenNewPOST(md common.MethodData) (r common.Response) {
 	data := tokenNewInData{}
-	err := json.Unmarshal(md.RequestData, &data)
+	err := md.RequestData.Unmarshal(&data)
 	if err != nil {
 		r = ErrBadJSON
 		return

common/method_data.go

@@ -2,6 +2,7 @@ package common
 
 import (
 	"database/sql"
+	"encoding/json"
 
 	"github.com/gin-gonic/gin"
 )
@@ -10,7 +11,7 @@ import (
 type MethodData struct {
 	User        Token
 	DB          *sql.DB
-	RequestData []byte
+	RequestData RequestData
 	C           *gin.Context
 }
 
@@ -23,3 +24,14 @@ func (md MethodData) Err(err error) {
 func (md MethodData) ID() int {
 	return md.User.UserID
 }
+
+// RequestData is the body of a request. It is wrapped into this type
+// to implement the Unmarshal function, which is just a shorthand to
+// json.Unmarshal.
+type RequestData []byte
+
+// Unmarshal json-decodes Requestdata into a value. Basically a
+// shorthand to json.Unmarshal.
+func (r RequestData) Unmarshal(into interface{}) error {
+	return json.Unmarshal([]byte(r), into)
+}