protoc-gen-jsonfd

#!/usr/bin/env python

# Convert FileDescriptorProto to JSON
# protoc -I/usr/local/include/ -I. --plugin=protoc-gen-jsonfd --jsonfd_out=. test.proto

import sys, json
import google.protobuf.compiler.plugin_pb2 as plugin
from google.protobuf.descriptor_pb2 import FileDescriptorProto
from protobuf_json import pb2json, json2pb

strip_source_code_info = True
useFieldNumber = True

def walk(node):
    if isinstance(node, dict):
        items = node.items()
    elif isinstance(node, list):
        items = enumerate(node)
    else:
        raise TypeError("Can't iterate over %s" % type(node))
    for key, item in items:
        if key == 'source_code_info':
            del node[key]
            continue
        if isinstance(item, dict) or isinstance(item, list):
            walk(item)
        else:
            pass;

def convert(file_in):
    out = pb2json(file_in)
    if strip_source_code_info:
        walk(out)
    if useFieldNumber:
        out = pb2json(json2pb(FileDescriptorProto(), out), useFieldNumber=useFieldNumber)
    return json.dumps(out, separators=(',', ':'))

data = sys.stdin.read()
req = plugin.CodeGeneratorRequest()
req.ParseFromString(data)
response = plugin.CodeGeneratorResponse()
for file_in in req.proto_file:
    if file_in.package == 'google.protobuf':
        continue
    file_out = response.file.add()
    file_out.name = "%s.json" % file_in.name[:-6]
    file_out.content = convert(file_in)
sys.stdout.write(response.SerializeToString())