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// Copyright 2020 The Matrix.org Foundation C.I.C.
//
// 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 internal
import (
"bytes"
"context"
"encoding/json"
"fmt"
"github.com/matrix-org/dendrite/keyserver/api"
"github.com/matrix-org/dendrite/keyserver/storage"
"github.com/matrix-org/gomatrixserverlib"
"github.com/tidwall/gjson"
"github.com/tidwall/sjson"
)
type KeyInternalAPI struct {
DB storage.Database
ThisServer gomatrixserverlib.ServerName
}
func (a *KeyInternalAPI) PerformUploadKeys(ctx context.Context, req *api.PerformUploadKeysRequest, res *api.PerformUploadKeysResponse) {
res.KeyErrors = make(map[string]map[string]*api.KeyError)
a.uploadDeviceKeys(ctx, req, res)
a.uploadOneTimeKeys(ctx, req, res)
}
func (a *KeyInternalAPI) PerformClaimKeys(ctx context.Context, req *api.PerformClaimKeysRequest, res *api.PerformClaimKeysResponse) {
}
func (a *KeyInternalAPI) QueryKeys(ctx context.Context, req *api.QueryKeysRequest, res *api.QueryKeysResponse) {
res.DeviceKeys = make(map[string]map[string]json.RawMessage)
res.Failures = make(map[string]interface{})
// make a map from domain to device keys
domainToUserToDevice := make(map[string][]api.DeviceKeys)
for userID, deviceIDs := range req.UserToDevices {
_, serverName, err := gomatrixserverlib.SplitID('@', userID)
if err != nil {
continue // ignore invalid users
}
domain := string(serverName)
// query local devices
if serverName == a.ThisServer {
deviceKeys, err := a.DB.DeviceKeysForUser(ctx, userID, deviceIDs)
if err != nil {
res.Error = &api.KeyError{
Err: fmt.Sprintf("failed to query local device keys: %s", err),
}
return
}
if res.DeviceKeys[userID] == nil {
res.DeviceKeys[userID] = make(map[string]json.RawMessage)
}
for _, dk := range deviceKeys {
// inject an empty 'unsigned' key which should be used for display names
// (but not via this API? unsure when they should be added)
dk.KeyJSON, _ = sjson.SetBytes(dk.KeyJSON, "unsigned", struct{}{})
res.DeviceKeys[userID][dk.DeviceID] = dk.KeyJSON
}
} else {
for _, deviceID := range deviceIDs {
domainToUserToDevice[domain] = append(domainToUserToDevice[domain], api.DeviceKeys{
UserID: userID,
DeviceID: deviceID,
})
}
}
}
// TODO: set device display names when they are known
// TODO: perform key queries for remote devices
}
func (a *KeyInternalAPI) uploadDeviceKeys(ctx context.Context, req *api.PerformUploadKeysRequest, res *api.PerformUploadKeysResponse) {
var keysToStore []api.DeviceKeys
// assert that the user ID / device ID are not lying for each key
for _, key := range req.DeviceKeys {
gotUserID := gjson.GetBytes(key.KeyJSON, "user_id").Str
gotDeviceID := gjson.GetBytes(key.KeyJSON, "device_id").Str
if gotUserID == key.UserID && gotDeviceID == key.DeviceID {
keysToStore = append(keysToStore, key)
continue
}
res.KeyError(key.UserID, key.DeviceID, &api.KeyError{
Err: fmt.Sprintf(
"user_id or device_id mismatch: users: %s - %s, devices: %s - %s",
gotUserID, key.UserID, gotDeviceID, key.DeviceID,
),
})
}
// get existing device keys so we can check for changes
existingKeys := make([]api.DeviceKeys, len(keysToStore))
for i := range keysToStore {
existingKeys[i] = api.DeviceKeys{
UserID: keysToStore[i].UserID,
DeviceID: keysToStore[i].DeviceID,
}
}
if err := a.DB.DeviceKeysJSON(ctx, existingKeys); err != nil {
res.Error = &api.KeyError{
Err: fmt.Sprintf("failed to query existing device keys: %s", err.Error()),
}
return
}
// store the device keys and emit changes
if err := a.DB.StoreDeviceKeys(ctx, keysToStore); err != nil {
res.Error = &api.KeyError{
Err: fmt.Sprintf("failed to store device keys: %s", err.Error()),
}
return
}
a.emitDeviceKeyChanges(existingKeys, keysToStore)
}
func (a *KeyInternalAPI) uploadOneTimeKeys(ctx context.Context, req *api.PerformUploadKeysRequest, res *api.PerformUploadKeysResponse) {
for _, key := range req.OneTimeKeys {
// grab existing keys based on (user/device/algorithm/key ID)
keyIDsWithAlgorithms := make([]string, len(key.KeyJSON))
i := 0
for keyIDWithAlgo := range key.KeyJSON {
keyIDsWithAlgorithms[i] = keyIDWithAlgo
i++
}
existingKeys, err := a.DB.ExistingOneTimeKeys(ctx, key.UserID, key.DeviceID, keyIDsWithAlgorithms)
if err != nil {
res.KeyError(key.UserID, key.DeviceID, &api.KeyError{
Err: "failed to query existing one-time keys: " + err.Error(),
})
continue
}
for keyIDWithAlgo := range existingKeys {
// if keys exist and the JSON doesn't match, error out as the key already exists
if !bytes.Equal(existingKeys[keyIDWithAlgo], key.KeyJSON[keyIDWithAlgo]) {
res.KeyError(key.UserID, key.DeviceID, &api.KeyError{
Err: fmt.Sprintf("%s device %s: algorithm / key ID %s one-time key already exists", key.UserID, key.DeviceID, keyIDWithAlgo),
})
continue
}
}
// store one-time keys
counts, err := a.DB.StoreOneTimeKeys(ctx, key)
if err != nil {
res.KeyError(key.UserID, key.DeviceID, &api.KeyError{
Err: fmt.Sprintf("%s device %s : failed to store one-time keys: %s", key.UserID, key.DeviceID, err.Error()),
})
continue
}
// collect counts
res.OneTimeKeyCounts = append(res.OneTimeKeyCounts, *counts)
}
}
func (a *KeyInternalAPI) emitDeviceKeyChanges(existing, new []api.DeviceKeys) {
// TODO
}
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