Implement GET endpoints for account_data in clientapi (#861)

* Implement GET endpoints for account_data in clientapi

* Fix accountDB parameter

* Remove fmt.Println

clientapi/routing/account_data.go

@@ -28,6 +28,38 @@ import (
 	"github.com/matrix-org/util"
 )
 
+// GetAccountData implements GET /user/{userId}/[rooms/{roomid}/]account_data/{type}
+func GetAccountData(
+	req *http.Request, accountDB *accounts.Database, device *authtypes.Device,
+	userID string, roomID string, dataType string,
+) util.JSONResponse {
+	if userID != device.UserID {
+		return util.JSONResponse{
+			Code: http.StatusForbidden,
+			JSON: jsonerror.Forbidden("userID does not match the current user"),
+		}
+	}
+
+	localpart, _, err := gomatrixserverlib.SplitID('@', userID)
+	if err != nil {
+		return httputil.LogThenError(req, err)
+	}
+
+	if data, err := accountDB.GetAccountDataByType(
+		req.Context(), localpart, roomID, dataType,
+	); err == nil {
+		return util.JSONResponse{
+			Code: http.StatusOK,
+			JSON: data,
+		}
+	}
+
+	return util.JSONResponse{
+		Code: http.StatusNotFound,
+		JSON: jsonerror.Forbidden("data not found"),
+	}
+}
+
 // SaveAccountData implements PUT /user/{userId}/[rooms/{roomId}/]account_data/{type}
 func SaveAccountData(
 	req *http.Request, accountDB *accounts.Database, device *authtypes.Device,

clientapi/routing/routing.go

@@ -430,6 +430,26 @@ func Setup(
 		}),
 	).Methods(http.MethodPut, http.MethodOptions)
 
+	r0mux.Handle("/user/{userID}/account_data/{type}",
+		common.MakeAuthAPI("user_account_data", authData, func(req *http.Request, device *authtypes.Device) util.JSONResponse {
+			vars, err := common.URLDecodeMapValues(mux.Vars(req))
+			if err != nil {
+				return util.ErrorResponse(err)
+			}
+			return GetAccountData(req, accountDB, device, vars["userID"], "", vars["type"])
+		}),
+	).Methods(http.MethodGet)
+
+	r0mux.Handle("/user/{userID}/rooms/{roomID}/account_data/{type}",
+		common.MakeAuthAPI("user_account_data", authData, func(req *http.Request, device *authtypes.Device) util.JSONResponse {
+			vars, err := common.URLDecodeMapValues(mux.Vars(req))
+			if err != nil {
+				return util.ErrorResponse(err)
+			}
+			return GetAccountData(req, accountDB, device, vars["userID"], vars["roomID"], vars["type"])
+		}),
+	).Methods(http.MethodGet)
+
 	r0mux.Handle("/rooms/{roomID}/members",
 		common.MakeAuthAPI("rooms_members", authData, func(req *http.Request, device *authtypes.Device) util.JSONResponse {
 			vars, err := common.URLDecodeMapValues(mux.Vars(req))