Use a structure instead of a map to represent a 3PID

src/github.com/matrix-org/dendrite/clientapi/auth/authtypes/threepid.go

@@ -0,0 +1,21 @@
+// Copyright 2017 Vector Creations Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package authtypes
+
+// ThreePID represents a third-party identifier
+type ThreePID struct {
+	Address string `json:"address"`
+	Medium  string `json:"medium"`
+}

src/github.com/matrix-org/dendrite/clientapi/auth/storage/accounts/storage.go

@@ -284,6 +284,6 @@ func (d *Database) GetLocalpartForThreePID(threepid string, medium string) (loca
 // a given local user.
 // If no association is known for this user, returns an empty slice.
 // Returns an error if there was an issue talking to the database.
-func (d *Database) GetThreePIDsForLocalpart(localpart string) (threepids map[string]string, err error) {
+func (d *Database) GetThreePIDsForLocalpart(localpart string) (threepids []authtypes.ThreePID, err error) {
 	return d.threepids.selectThreePIDsForLocalpart(localpart)
 }

src/github.com/matrix-org/dendrite/clientapi/auth/storage/accounts/threepid_table.go

@@ -16,6 +16,8 @@ package accounts
 
 import (
 	"database/sql"
+
+	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
 )
 
 const threepidSchema = `
@@ -88,20 +90,20 @@ func (s *threepidStatements) selectLocalpartForThreePID(txn *sql.Tx, threepid st
 	return
 }
 
-func (s *threepidStatements) selectThreePIDsForLocalpart(localpart string) (threepids map[string]string, err error) {
+func (s *threepidStatements) selectThreePIDsForLocalpart(localpart string) (threepids []authtypes.ThreePID, err error) {
 	rows, err := s.selectThreePIDsForLocalpartStmt.Query(localpart)
 	if err != nil {
 		return
 	}
 
-	threepids = make(map[string]string)
+	threepids = []authtypes.ThreePID{}
 	for rows.Next() {
 		var threepid string
 		var medium string
 		if err = rows.Scan(&threepid, &medium); err != nil {
 			return
 		}
-		threepids[threepid] = medium
+		threepids = append(threepids, authtypes.ThreePID{threepid, medium})
 	}
 
 	return

src/github.com/matrix-org/dendrite/clientapi/readers/threepid.go

@@ -32,12 +32,7 @@ type reqTokenResponse struct {
 }
 
 type threePIDsResponse struct {
-	ThreePIDs []threePID `json:"threepids"`
-}
-
-type threePID struct {
-	Medium  string `json:"medium"`
-	Address string `json:"address"`
+	ThreePIDs []authtypes.ThreePID `json:"threepids"`
 }
 
 // RequestEmailToken implements:
@@ -141,22 +136,15 @@ func GetAssociated3PIDs(
 		return httputil.LogThenError(req, err)
 	}
 
-	var resp threePIDsResponse
-	resp.ThreePIDs = []threePID{}
-	for address, medium := range threepids {
-		tpid := threePID{Medium: medium, Address: address}
-		resp.ThreePIDs = append(resp.ThreePIDs, tpid)
-	}
-
 	return util.JSONResponse{
 		Code: 200,
-		JSON: resp,
+		JSON: threePIDsResponse{threepids},
 	}
 }
 
 // Forget3PID implements POST /account/3pid/delete
 func Forget3PID(req *http.Request, accountDB *accounts.Database) util.JSONResponse {
-	var body threePID
+	var body authtypes.ThreePID
 	if reqErr := httputil.UnmarshalJSONRequest(req, &body); reqErr != nil {
 		return *reqErr
 	}