feat: enable S3 video uploads and update related configurations

- Added support for self-hosted S3 video uploads with new environment variables: OPENFRAME_ENABLE_S3_VIDEO_UPLOADS and OPENFRAME_MAX_VIDEO_UPLOAD_BYTES.
- Updated .env.example and .env.docker.example to reflect new configuration options.
- Enhanced Content Security Policy to include origins for S3-compatible storage.
- Updated dependencies for AWS SDK to support new features.
- Refactored upload logic to accommodate both Bunny and S3 upload providers.
- Updated documentation to clarify the usage of direct uploads and S3 configurations.
- Closes #11

lib/feature-flags.ts

@@ -1,3 +1,5 @@
+import { logError } from '@/lib/logger';
+
 function readBooleanEnv(name: string, defaultValue: boolean): boolean {
   const value = process.env[name];
   if (!value) return defaultValue;
@@ -9,6 +11,20 @@ function readBooleanEnv(name: string, defaultValue: boolean): boolean {
   return defaultValue;
 }
 
+let warnedAboutConflictingUploadFlags = false;
+
+function warnIfConflictingDirectUploadFlags(): void {
+  if (warnedAboutConflictingUploadFlags) return;
+  if (!isS3VideoUploadsFeatureEnabled() || !isBunnyUploadsFeatureEnabled()) return;
+  if (!hasR2Config() || !hasBunnyUploadsConfig()) return;
+
+  warnedAboutConflictingUploadFlags = true;
+  logError(
+    'OPENFRAME_ENABLE_S3_VIDEO_UPLOADS and OPENFRAME_ENABLE_BUNNY_UPLOADS are both enabled with valid config. S3 video uploads take precedence; disable Bunny uploads for self-hosted deployments.',
+    new Error('Conflicting direct upload feature flags')
+  );
+}
+
 export function isStripeFeatureEnabled() {
   return readBooleanEnv('OPENFRAME_ENABLE_STRIPE', true);
 }
@@ -32,10 +48,52 @@ export function hasBunnyUploadsConfig() {
   );
 }
 
+export function isS3VideoUploadsFeatureEnabled() {
+  return readBooleanEnv('OPENFRAME_ENABLE_S3_VIDEO_UPLOADS', false);
+}
+
+export function hasR2Config() {
+  return Boolean(
+    process.env.R2_ACCESS_KEY_ID &&
+    process.env.R2_SECRET_ACCESS_KEY &&
+    process.env.R2_BUCKET_NAME &&
+    (process.env.R2_ENDPOINT || process.env.R2_ACCOUNT_ID)
+  );
+}
+
+export function isS3VideoUploadsEnabled() {
+  warnIfConflictingDirectUploadFlags();
+  return isS3VideoUploadsFeatureEnabled() && hasR2Config();
+}
+
 export function isBunnyUploadsEnabled() {
+  if (isS3VideoUploadsEnabled()) {
+    return false;
+  }
   return isBunnyUploadsFeatureEnabled() && hasBunnyUploadsConfig();
 }
 
+export function isDirectFileUploadEnabled() {
+  return isS3VideoUploadsEnabled() || isBunnyUploadsEnabled();
+}
+
+export function getMaxVideoUploadBytes(): bigint {
+  const raw = process.env.OPENFRAME_MAX_VIDEO_UPLOAD_BYTES?.trim();
+  if (!raw) {
+    return BigInt(5) * BigInt(1024) * BigInt(1024) * BigInt(1024);
+  }
+
+  try {
+    const parsed = BigInt(raw);
+    if (parsed <= BigInt(0)) {
+      return BigInt(5) * BigInt(1024) * BigInt(1024) * BigInt(1024);
+    }
+    return parsed;
+  } catch {
+    return BigInt(5) * BigInt(1024) * BigInt(1024) * BigInt(1024);
+  }
+}
+
 export function isInviteCodeRequired() {
   return readBooleanEnv('OPENFRAME_REQUIRE_INVITE_CODE', true);
 }