Use a sensible error handler

openflexure_microscope/api/exceptions.py

@@ -0,0 +1,31 @@
+from flask import jsonify
+from werkzeug.exceptions import default_exceptions
+from werkzeug.exceptions import HTTPException
+
+from pprint import pprint
+
+class JSONExceptionHandler(object):
+
+    def __init__(self, app=None):
+        if app:
+            self.init_app(app)
+
+    def std_handler(self, error):
+        message = error.description if isinstance(error, HTTPException) else error.message
+        status_code = error.code if isinstance(error, HTTPException) else 500
+
+        response = {
+            'status_code': status_code,
+            'message': message
+        }
+        return jsonify(response)
+
+
+    def init_app(self, app):
+        self.app = app
+        self.register(HTTPException)
+        for code, v in default_exceptions.items():
+            self.register(code)
+
+    def register(self, exception_or_code, handler=None):
+        self.app.errorhandler(exception_or_code)(handler or self.std_handler)