First steps createContributionMessage method of ContributionMessageResolver.

backend/src/graphql/resolver/ContributionMessageResolver.ts

@@ -0,0 +1,33 @@
+import { RIGHTS } from '@/auth/RIGHTS'
+import { Context, getUser } from '@/server/context'
+import { ContributionMessage } from '@entity/ContributionMessage'
+import { Args, Authorized, Ctx, Mutation, Resolver } from 'type-graphql'
+import ContributionMessageArgs from '@arg/ContributionMessageArgs'
+import { Contribution } from '@entity/Contribution'
+import { ContributionMessageType } from '@enum/MessageType'
+
+@Resolver()
+export class ContributionResolver {
+  @Authorized([RIGHTS.CREATE_CONTRIBUTION_MESSAGE])
+  @Mutation(() => ContributionMessage)
+  async createContributionMessage(
+    @Args() { contributionId, message }: ContributionMessageArgs,
+    @Ctx() context: Context,
+  ): Promise<ContributionMessage> {
+    const user = getUser(context)
+    const contribution = await Contribution.findOneOrFail({ id: contributionId })
+    if (!user.isAdmin && contribution.userId !== user.id) {
+      throw new Error('Can not send message to contribution of another user')
+    }
+
+    const contributionMessage = new ContributionMessage()
+    contributionMessage.contributionId = contributionId
+    contributionMessage.createdAt = new Date()
+    contributionMessage.message = message
+    contributionMessage.userId = user.id
+    contributionMessage.type = ContributionMessageType.DIALOG
+
+    ContributionMessage.save(contributionMessage)
+    return contributionMessage
+  }
+}