fix(openrtb): convert extension type from interface to json raw message

go.mod

@@ -4,6 +4,7 @@ go 1.12
 
 require (
 	github.com/go-test/deep v1.0.4
+	github.com/google/go-cmp v0.5.6
 	github.com/mailru/easyjson v0.7.7
 	golang.org/x/lint v0.0.0-20201208152925-83fdc39ff7b5 // indirect
 )

go.sum

@@ -1,5 +1,11 @@
 github.com/go-test/deep v1.0.4 h1:u2CU3YKy9I2pmu9pX0eq50wCgjfGIt539SqR7FbHiho=
 github.com/go-test/deep v1.0.4/go.mod h1:wGDj63lr65AM2AQyKZd/NYHGb0R+1RLqB8NKt3aSFNA=
+github.com/google/go-cmp v0.5.6 h1:BKbKCqvP6I+rmFHt06ZmyQtvB8xAkWdhFyr0ZUNZcxQ=
+github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/josharian/intern v1.0.0 h1:vlS4z54oSdjm0bgjRigI+G1HpF+tI+9rE5LLzOg8HmY=
+github.com/josharian/intern v1.0.0/go.mod h1:5DoeVV0s6jJacbCEi61lwdGj/aVlrQvzHFFd8Hwg//Y=
+github.com/mailru/easyjson v0.7.1 h1:mdxE1MF9o53iCb2Ghj1VfWvh7ZOwHpnVG/xwXrV90U8=
+github.com/mailru/easyjson v0.7.1/go.mod h1:KAzv3t3aY1NaHWoQz1+4F1ccyAH66Jk7yos7ldAVICs=
 github.com/josharian/intern v1.0.0 h1:vlS4z54oSdjm0bgjRigI+G1HpF+tI+9rE5LLzOg8HmY=
 github.com/josharian/intern v1.0.0/go.mod h1:5DoeVV0s6jJacbCEi61lwdGj/aVlrQvzHFFd8Hwg//Y=
 github.com/mailru/easyjson v0.7.7 h1:UGYAvKxe3sBsEDzO8ZeWOSlIQfWFlxbzLZe7hwFURr0=
@@ -18,3 +24,4 @@ golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/tools v0.0.0-20200130002326-2f3ba24bd6e7 h1:EBZoQjiKKPaLbPrbpssUfuHtwM6KV/vb4U85g/cigFY=
 golang.org/x/tools v0.0.0-20200130002326-2f3ba24bd6e7/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=

openrtb/application.go

@@ -1,6 +1,10 @@
 package openrtb
 
-import "github.com/Vungle/vungo/internal/util"
+import (
+	"encoding/json"
+
+	"github.com/Vungle/vungo/internal/util"
+)
 
 // Application object should be included if the ad supported content is a
 // non-browser application (typically in mobile) as opposed to a website.
@@ -134,7 +138,7 @@ type Application struct {
 	//   object
 	// Description:
 	//   Placeholder for exchange-specific extensions to OpenRTB.
-	Extension interface{} `json:"ext,omitempty"`
+	Extension json.RawMessage `json:"ext,omitempty"`
 }
 
 // Validate method checks to see if the Application object contains required and well-formatted data
@@ -171,7 +175,7 @@ func (a *Application) Copy() *Application {
 	appCopy.Publisher = a.Publisher.Copy()
 	appCopy.Content = a.Content.Copy()
 
-	appCopy.Extension = util.DeepCopyCopiable(a.Extension)
+	appCopy.Extension = util.DeepCopyJSONRawMsg(a.Extension)
 
 	return &appCopy
 }

openrtb/audio.go

@@ -1,6 +1,7 @@
 package openrtb
 
 import (
+	"encoding/json"
 	"errors"
 
 	"github.com/Vungle/vungo/internal/util"
@@ -185,7 +186,7 @@ type Audio struct {
 	//   object
 	// Description:
 	//   Placeholder for exchange-specific extensions to OpenRTB.
-	Extension interface{} `json:"ext,omitempty"`
+	Extension json.RawMessage `json:"ext,omitempty"`
 }
 
 // Validate method implements a Validater interface and return a validation error according to the
@@ -249,7 +250,7 @@ func (a *Audio) Copy() *Audio {
 		copy(vCopy.CompanionTypes, a.CompanionTypes)
 	}
 
-	vCopy.Extension = util.DeepCopyCopiable(a.Extension)
+	vCopy.Extension = util.DeepCopyJSONRawMsg(a.Extension)
 
 	return &vCopy
 }