add import capability for old flows, fix #840

1 files changed, 33 insertions, 0 deletions

diff --git a/libmproxy/flow_format_compat.py b/libmproxy/flow_format_compat.py
new file mode 100644
index 00000000..02fa41a3
--- /dev/null
+++ b/libmproxy/flow_format_compat.py
@@ -0,0 +1,33 @@
+"""
+This module handles the import of mitmproxy flows generated by old versions.
+"""
+from __future__ import absolute_import, print_function, division
+from . import version
+
+
+def convert_013_014(data):
+    data["request"]["first_line_format"] = data["request"].pop("form_in")
+    data["request"]["http_version"] = "HTTP/" + ".".join(str(x) for x in data["request"].pop("httpversion"))
+    data["response"]["status_code"] = data["response"].pop("code")
+    data["response"]["body"] = data["response"].pop("content")
+    data["server_conn"].pop("state")
+    data["server_conn"]["via"] = None
+    data["version"] = version.IVERSION
+    return data
+
+converters = {
+    (0, 13): convert_013_014
+}
+
+
+def migrate_flow(flow_data):
+    while True:
+        flow_version = tuple(flow_data["version"][:2])
+        if flow_version == version.IVERSION[:2]:
+            break
+        elif flow_version in converters:
+            flow_data = converters[flow_version](flow_data)
+        else:
+            v = ".".join(str(i) for i in flow_data["version"])
+            raise ValueError("Incompatible serialized data version: {}".format(v))
+    return flow_data