Password Change Graph Support

graph/typeDefs.graphql

@@ -1436,6 +1436,21 @@ type DelUserResponse implements Response {
   errors: [UserError!]
 }
 
+input ChangePasswordInput {
+  # oldPassword is the previous password set on the account. An incorrect
+  # password here will result in an unauthorized error being thrown.
+  oldPassword: String!
+
+  # newPassword is the password we're changing it to.
+  newPassword: String!
+}
+
+type ChangePasswordResponse implements Response {
+
+  # An array of errors relating to the mutation that occurred.
+  errors: [UserError!]
+}
+
 # All mutations for the application are defined on this object.
 type RootMutation {
 
@@ -1536,6 +1551,10 @@ type RootMutation {
 
   # delUser will delete the user with the specified id.
   delUser(id: ID!): DelUserResponse
+
+  # changePassword allows the current user to change their password that have an
+  # associated local user account.
+  changePassword(input: ChangePasswordInput!): ChangePasswordResponse
 }
 
 type UsernameChangedPayload {