Add gitea router

- added a gitea router
  - /gitea/latest endpoint gives the latest release version of a repo.

routers/gitea.py

@@ -0,0 +1,37 @@
+import logging
+from typing import Optional
+import giteapy
+import json
+
+from pathlib import Path
+from fastapi import APIRouter, Header, Query, HTTPException
+from gitea.gitea import Repository
+
+ROOT_PATH = Path.home().joinpath(".radical_api/gitea")
+
+logger = logging.getLogger("gitea")
+router = APIRouter()
+
+@router.get("/gitea/latest")
+def get_latest_version(base_url: Optional[str] = Header(None), author: str = Query(None), repo: str = Query(None), pre_releases: bool = Query(False)):
+    with ROOT_PATH.joinpath("keys.json").open("r") as fp:
+        data: dict = json.load(fp)
+    if base_url in data.keys():
+        config = giteapy.Configuration()
+        config.api_key['access_token'] = data[base_url]
+        config.host = base_url + "/api/v1"
+        api = giteapy.RepositoryApi(giteapy.ApiClient(config))
+        response = api.repo_list_releases(author, repo)
+        if len(response) == 0:
+            raise HTTPException(404, "No releases for given repository.")
+
+        for release in response:
+            release: giteapy.Release
+            if pre_releases:
+                return release.name
+            elif not pre_releases and release.prerelease:
+                continue
+            elif not pre_releases and not release.prerelease:
+                return release.name
+    else:
+        raise HTTPException(400, "API cannot access this Gitea instance.")