implement the github issue sync component

bridge/__init__.py

@@ -300,4 +300,127 @@ def gitea_handle_issue_action():
             },
         )
     
-    return ''
+    return ''
+
+@app.route("/bridge/endpoints/github/issue", methods=["POST"])
+def github_handle_issue_action():
+    gitea = Gitea(app.config["GITEA_ACCESS_TOKEN"])
+    github = Github(app.config["GITHUB_ACCESS_TOKEN"])
+
+    data = request.json
+
+    try:
+        event_type = data["action"]
+
+        repo_owner = data["repository"]["owner"]["login"]
+        repo_name = data["repository"]["name"]
+        issue_user = data["issue"]["user"]["login"]
+        issue_user_url = "https://github.com/{}".format(
+            issue_user,
+        )
+        issue_number = data["issue"]["number"]
+
+        if event_type == "opened": # new issue created
+            event_title = data["issue"]["title"]
+            event_body = data["issue"]["body"]
+        elif event_type == "created": # new comment on that issue
+            event_title = None
+            event_body = data["comment"]["body"]
+        elif event_type == "closed": # issue closed
+            event_title = None
+            event_body = data["issue"]["body"]
+
+        if not event_body: event_body = ""
+        event_url = data["issue"]["url"]
+
+    except KeyError as e:
+        print(e, type(e))
+        abort(400) # the data isn't formatted correctly
+
+    if issue_sentinel in event_body:
+        return ''
+
+    if event_type == "opened":
+        issue_header = "*This issue has automatically been created by [`gitea-github-sync`](https://{}/bridge/about) on behalf of [{}]({}).*".format(
+            app.config["GITEA_INSTANCE_DOMAIN"],
+            issue_user,
+            issue_user_url,
+        )
+
+        issue_footer = """
+<details>
+    <summary>Internal issue metadata</summary>
+
+    {}
+</details>
+        """.format(generate_sentinel(event_url))
+
+        issue_body = "\n\n".join([
+            issue_header,
+            event_body,
+            issue_footer
+        ])
+
+        gitea_create_issue_result = gitea.post(
+            "https://{}/api/v1/repos/{}/{}/issues".format(
+                app.config["GITEA_INSTANCE_DOMAIN"],
+                repo_owner,
+                repo_name,
+            ),
+            json={
+                "title": event_title,
+                "body": issue_body,
+            } 
+        )
+
+    elif event_type == "created":
+        comment_user = data["comment"]["user"]["login"]
+        comment_user_url = "https://github.com/{}".format(
+            comment_user,
+        )
+        comment_header = "*This comment has automatically been created by [`gitea-github-sync`](https://{}/bridge/about) on behalf of [{}]({}).*".format(
+            app.config["GITEA_INSTANCE_DOMAIN"],
+            comment_user,
+            comment_user_url,
+        )
+
+        comment_footer = """
+<details>
+    <summary>Internal issue metadata</summary>
+
+    {}
+</details>
+        """.format(generate_sentinel(event_url))
+
+        comment_body = "\n\n".join([
+            comment_header,
+            event_body,
+            comment_footer,
+        ])
+
+        gitea_comment_post_result = gitea.post(
+            "https://{}/api/v1/repos/{}/{}/issues/{}/comments".format(
+                app.config["GITEA_INSTANCE_DOMAIN"],
+                repo_owner,
+                repo_name,
+                issue_number,
+            ),
+            json={
+                "body": comment_body,
+            },
+        )
+        
+    elif event_type == "closed":
+        gitea_close_issue_result = gitea.patch(
+            "https://{}/api/v1/repos/{}/{}/issues/{}".format(
+                app.config["GITEA_INSTANCE_DOMAIN"],
+                repo_owner,
+                repo_name,
+                issue_number,
+            ),
+            json={
+                "state": "closed",
+            },
+        )
+    
+    return ''