feat(mail): add governed JMAP mailbox sync and search

src/govoplan_mail/backend/config.py

@@ -1,5 +1,8 @@
 from __future__ import annotations
 
+import urllib.parse
+from typing import Literal
+
 from pydantic import Field, model_validator
 
 from govoplan_core.mail.config import (
@@ -51,10 +54,80 @@ class Pop3Config(Pop3ServerConfig):
     username: str | None = None
     password: str | None = None
 
+
+class JmapServerConfig(StrictModel):
+    """Server-only settings for an RFC 8620/8621 mailbox endpoint."""
+
+    session_url: str
+    account_id: str | None = Field(default=None, max_length=255)
+    auth_scheme: Literal["bearer", "basic"] = "bearer"
+    timeout_seconds: int = Field(default=20, ge=1, le=120)
+    max_response_bytes: int = Field(
+        default=5 * 1024 * 1024,
+        ge=64 * 1024,
+        le=25 * 1024 * 1024,
+    )
+    max_body_value_bytes: int = Field(
+        default=1 * 1024 * 1024,
+        ge=1_024,
+        le=5 * 1024 * 1024,
+    )
+    allowed_api_origins: list[str] = Field(default_factory=list, max_length=10)
+
+    @model_validator(mode="after")
+    def validate_urls(self) -> "JmapServerConfig":
+        self.session_url = _absolute_http_url(self.session_url, label="JMAP session URL")
+        session_origin = _http_origin(self.session_url)
+        origins: list[str] = []
+        for value in self.allowed_api_origins:
+            normalized = _http_origin(
+                _absolute_http_url(value, label="JMAP allowed API origin")
+            )
+            if normalized != session_origin and normalized not in origins:
+                origins.append(normalized)
+        self.allowed_api_origins = origins
+        if self.account_id is not None:
+            self.account_id = self.account_id.strip() or None
+        return self
+
+
+class JmapConfig(JmapServerConfig):
+    username: str | None = Field(default=None, max_length=320)
+    password: str | None = None
+
+    @model_validator(mode="after")
+    def validate_credentials(self) -> "JmapConfig":
+        if self.auth_scheme == "basic" and not (self.username and self.password):
+            raise ValueError("JMAP Basic authentication requires username and password")
+        if self.auth_scheme == "bearer" and not self.password:
+            raise ValueError("JMAP Bearer authentication requires an access token")
+        return self
+
+
+def _absolute_http_url(value: str, *, label: str) -> str:
+    parsed = urllib.parse.urlsplit(str(value or "").strip())
+    if parsed.scheme not in {"http", "https"} or not parsed.netloc:
+        raise ValueError(f"{label} must be an absolute HTTP(S) URL")
+    if parsed.username or parsed.password:
+        raise ValueError(f"{label} must not include embedded credentials")
+    if parsed.fragment:
+        raise ValueError(f"{label} must not include a fragment")
+    return urllib.parse.urlunsplit(parsed)
+
+
+def _http_origin(value: str) -> str:
+    parsed = urllib.parse.urlsplit(value)
+    port = parsed.port or (443 if parsed.scheme == "https" else 80)
+    default_port = 443 if parsed.scheme == "https" else 80
+    suffix = "" if port == default_port else f":{port}"
+    return f"{parsed.scheme.lower()}://{(parsed.hostname or '').lower()}{suffix}"
+
 __all__ = [
     "ImapConfig",
     "ImapFolderMappings",
     "ImapServerConfig",
+    "JmapConfig",
+    "JmapServerConfig",
     "Pop3Config",
     "Pop3ServerConfig",
     "SmtpConfig",