feat: add new config strategy to backend

backend/src/config/config.service.ts

@@ -0,0 +1,41 @@
+import { Inject, Injectable } from "@nestjs/common";
+import { Config } from "@prisma/client";
+import { PrismaService } from "src/prisma/prisma.service";
+
+@Injectable()
+export class ConfigService {
+  constructor(
+    @Inject("CONFIG_VARIABLES") private configVariables: Config[],
+    private prisma: PrismaService
+  ) {}
+
+  get(key: string): any {
+    const configVariable = this.configVariables.filter(
+      (variable) => variable.key == key
+    )[0];
+
+    if (!configVariable) throw new Error(`Config variable ${key} not found`);
+
+    const value = configVariable.value ?? configVariable.default;
+
+    if (configVariable.type == "number") return parseInt(value);
+    if (configVariable.type == "boolean") return value == "true";
+    if (configVariable.type == "string") return value;
+  }
+
+  async listForAdmin() {
+    return await this.prisma.config.findMany();
+  }
+
+  async list() {
+    const configVariables = await this.prisma.config.findMany({
+      where: { secret: { equals: false } },
+    });
+
+    return configVariables.map((configVariable) => {
+      if (!configVariable.value) configVariable.value = configVariable.default;
+
+      return configVariable;
+    });
+  }
+}