feat: reverse shares (#86)

* add first concept

* add reverse share funcionality to frontend

* allow creator to limit share expiration

* moved reverse share in seperate module

* add table to manage reverse shares

* delete complete share if reverse share was deleted

* optimize function names

* add db migration

* enable reverse share email notifications

* fix config variable descriptions

* fix migration for new installations

backend/src/file/file.controller.ts

@@ -14,6 +14,7 @@ import * as contentDisposition from "content-disposition";
 import { Response } from "express";
 import { JwtGuard } from "src/auth/guard/jwt.guard";
 import { FileDownloadGuard } from "src/file/guard/fileDownload.guard";
+import { CreateShareGuard } from "src/share/guard/createShare.guard";
 import { ShareOwnerGuard } from "src/share/guard/shareOwner.guard";
 import { ShareSecurityGuard } from "src/share/guard/shareSecurity.guard";
 import { FileService } from "./file.service";
@@ -24,7 +25,7 @@ export class FileController {
 
   @Post()
   @SkipThrottle()
-  @UseGuards(JwtGuard, ShareOwnerGuard)
+  @UseGuards(CreateShareGuard, ShareOwnerGuard)
   async create(
     @Query() query: any,
 

backend/src/file/file.module.ts

@@ -1,11 +1,12 @@
 import { Module } from "@nestjs/common";
 import { JwtModule } from "@nestjs/jwt";
+import { ReverseShareModule } from "src/reverseShare/reverseShare.module";
 import { ShareModule } from "src/share/share.module";
 import { FileController } from "./file.controller";
 import { FileService } from "./file.service";
 
 @Module({
-  imports: [JwtModule.register({}), ShareModule],
+  imports: [JwtModule.register({}), ReverseShareModule, ShareModule],
   controllers: [FileController],
   providers: [FileService],
   exports: [FileService],

backend/src/file/file.service.ts

@@ -30,7 +30,7 @@ export class FileService {
 
     const share = await this.prisma.share.findUnique({
       where: { id: shareId },
-      include: { files: true },
+      include: { files: true, reverseShare: true },
     });
 
     if (share.uploadLocked)
@@ -64,9 +64,12 @@ export class FileService {
       0
     );
 
+    const shareSizeSum = fileSizeSum + diskFileSize + buffer.byteLength;
+
     if (
-      fileSizeSum + diskFileSize + buffer.byteLength >
-      this.config.get("MAX_SHARE_SIZE")
+      shareSizeSum > this.config.get("MAX_SHARE_SIZE") ||
+      (share.reverseShare?.maxShareSize &&
+        shareSizeSum > parseInt(share.reverseShare.maxShareSize))
     ) {
       throw new HttpException(
         "Max share size exceeded",