how to convert protobuf readable request to proto message - binary-data

Question

I am playing with google api for educational purpose to learn protobuf connection. But i am getting 400 Bad Request when i sending post request. I hope so my protobuf message have problem and don't understand how to i write 0: 0 message in proto file. I am using PHP Protobuf library to serialization data.
This is readable/decoded grpc post request data:
0: 0
0: 0
}
1: 0x80c2:0x3a2f
2: this is test
3: 5
7 {
9: nG86YfStD4Of9QPB_L_QDg:28441478
15: 20089
}
8 {
1 {
1: 5
}
}
9 {
1: 0
2: 1
}
11: 1
12: 1
14: 0
16 {
I created this proto messages by following above grpc request data:
syntax = "proto3";
enum firstZero {
COUNT = 0;
}
message submit {
string pid = 1;
string rtext = 2;
int32 str = 3;
.unknown_auto_data unknown = 7;
.unknown_auto_data_eight unknown_one = 8;
.unknown_auto_data_nine unknown_two = 9;
int32 unknown_int = 11;
int32 unknown_int_one = 12;
int32 unknown_int_two = 14;
string unknown_string = 16;
}
message unknown_auto_data {
string auto_data = 9;
int32 auto_int = 15;
}
message unknown_auto_data_eight {
.unknown_repeated_one unknown_re_one = 1;
}
message unknown_repeated_one {
int32 unknown_rep = 1;
}
message unknown_auto_data_nine {
int32 unknown_it = 1;
int32 unknown_itt = 2;
}
Is my proto messages are correct? or How will i write it?
Also my request model data in php:
class RequestModel {
public $jsonData = [
"pid" => "0x80c2:0x3a2f",
"rtext" => "Awesome, This is test.",
"str" => "5"
];
public function getData() {
return json_encode($this->jsonData);
}
}
Is there (online/software/method) any tools to decode grpc/protobuf request/response to readable data like above json like data?
\x01\x00\x00\x05\xc0\x1f\x8b\x08\x00\x00\x00\x00\x00\x00\x03\xcdVM\x88\x1be\x18\xced\xdb\xed:E\xba.......

Answer 1

To convert binary protobuf data to a readable form, use protoc --decode_raw. The output will not have any field names, as those are not part of the wire format. Here is an example from https://github.com/pawitp/protobuf-decoder, which also provides an online-service to do the same thing.
echo -en "\x0a\x2f\x0a\x08\x4a\x6f\x68\x6e\x20\x44\x6f\
\x65\x10\x01\x1a\x10\x6a\x6f\x68\x6e\x40\x65\x78\x61\x6d\
\x70\x6c\x65\x2e\x63\x6f\x6d\x22\x0f\x0a\x0b\x31\x31\x31\
\x2d\x32\x32\x32\x2d\x33\x33\x33\x10\x01\x0a\x1e\x0a\x08\
\x4a\x61\x6e\x65\x20\x44\x6f\x65\x10\x02\x1a\x10\x6a\x61\
\x6e\x65\x40\x65\x78\x61\x6d\x70\x6c\x65\x2e\x63\x6f\x6d"\
| protoc --decode_raw
1 {
1: "John Doe"
2: 1
3: "john#example.com"
4 {
1: "111-222-333"
2: 1
}
}
1 {
1: "Jane Doe"
2: 2
3: "jane#example.com"
}
If you have the .proto file for your data, use protoc --decode instead.
echo -en "\x0a\x2f\x0a\x08\x4a\x6f\x68\x6e\x20\x44\x6f\
\x65\x10\x01\x1a\x10\x6a\x6f\x68\x6e\x40\x65\x78\x61\x6d\
\x70\x6c\x65\x2e\x63\x6f\x6d\x22\x0f\x0a\x0b\x31\x31\x31\
\x2d\x32\x32\x32\x2d\x33\x33\x33\x10\x01\x0a\x1e\x0a\x08\
\x4a\x61\x6e\x65\x20\x44\x6f\x65\x10\x02\x1a\x10\x6a\x61\
\x6e\x65\x40\x65\x78\x61\x6d\x70\x6c\x65\x2e\x63\x6f\x6d"\
| protoc --decode=AddressBook addresses.proto
addresses {
name: "John Doe"
id: 1
email: "john#example.com"
numbers {
number: "111-222-333"
id: 1
}
}
addresses {
name: "Jane Doe"
id: 2
email: "jane#example.com"
}
Where addresses.proto looks like this:
syntax = "proto3";
message AddressBook {
repeated Address addresses = 1;
}
message Address {
string name = 1;
int32 id = 2;
string email = 3;
repeated Number numbers = 4;
}
message Number {
string number = 1;
int32 id = 2;
}
You can also use protoc to encode from the textual representation to the binary variant:
echo 'addresses { name: "Mike", email: "mike#mike.us" }' | protoc --encode=AddressBook addresses.proto > addressbook.bin
cat addressbook.bin | protoc --decode=AddressBook addresses.proto
addresses {
name: "Mike"
email: "mike#mike.us"
}