feat: connect desktop sessions and streaming

src/javis/core/provider_router.py

@@ -4,6 +4,7 @@ from __future__ import annotations
 
 from collections.abc import Callable, Iterator
 from dataclasses import dataclass
+from enum import StrEnum
 
 from javis.memory.usage_store import ProviderEvent, SQLiteUsageStore, UsageStoreError
 from javis.providers.base import (
@@ -18,7 +19,14 @@ from javis.providers.base import (
 )
 from javis.security.privacy import CloudPolicy, PrivacyDecision, PrivacyRouter
 
-ApprovalCallback = Callable[[PrivacyDecision], bool]
+
+class ApprovalChoice(StrEnum):
+    ALLOW = "allow"
+    LOCAL = "local"
+    CANCEL = "cancel"
+
+
+ApprovalCallback = Callable[[PrivacyDecision], ApprovalChoice | bool]
 NoticeCallback = Callable[[str], None]
 CloudProviderFactory = Callable[[], LocalModelProvider]
 
@@ -89,6 +97,14 @@ class HybridProvider:
             raise ValueError("Provider-Modus muss auto, local oder gemini sein.")
         self.mode = mode
 
+    def _approval_choice(self, decision: PrivacyDecision) -> ApprovalChoice:
+        result = self._approval_callback(decision)
+        if isinstance(result, bool):
+            return ApprovalChoice.ALLOW if result else ApprovalChoice.LOCAL
+        if isinstance(result, ApprovalChoice):
+            return result
+        raise ValueError("Ungültiges Ergebnis der Cloudfreigabe.")
+
     def chat(self, messages: list[ChatMessage]) -> str:
         current_text = messages[-1].content if messages else ""
         cloud_requested = self.mode == "gemini"
@@ -110,8 +126,11 @@ class HybridProvider:
 
         approved = decision.policy is CloudPolicy.ALLOWED
         if decision.policy is CloudPolicy.ASK:
-            approved = self._approval_callback(decision)
-            if not approved:
+            choice = self._approval_choice(decision)
+            if choice is ApprovalChoice.CANCEL:
+                raise ResponseAbortedError("Anfrage vor der Cloudfreigabe abgebrochen.")
+            approved = choice is ApprovalChoice.ALLOW
+            if choice is ApprovalChoice.LOCAL:
                 return self._local(messages, decision, "Cloudfreigabe abgelehnt", fallback=True)
 
         unavailable_reason = self._cloud_unavailable_reason()
@@ -194,8 +213,11 @@ class HybridProvider:
 
         approved = decision.policy is CloudPolicy.ALLOWED
         if decision.policy is CloudPolicy.ASK:
-            approved = self._approval_callback(decision)
-            if not approved:
+            choice = self._approval_choice(decision)
+            if choice is ApprovalChoice.CANCEL:
+                raise ResponseAbortedError("Anfrage vor der Cloudfreigabe abgebrochen.")
+            approved = choice is ApprovalChoice.ALLOW
+            if choice is ApprovalChoice.LOCAL:
                 yield from self._stream_local(
                     messages,
                     decision,