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#!/usr/bin/env python2.7
"""Read from stdin a set of colon separated http headers:
:path: /foo/bar
content-type: application/grpc
Write a set of strings containing a hpack encoded http2 frame that
represents said headers."""
import json
import sys
# parse input, fill in vals
vals = []
for line in sys.stdin:
line = line.strip()
if line == '': continue
if line[0] == '#': continue
key_tail, value = line[1:].split(':')
key = (line[0] + key_tail).strip()
value = value.strip()
vals.append((key, value))
# generate frame payload binary data
payload_bytes = [[]] # reserve space for header
payload_len = 0
for key, value in vals:
payload_line = []
payload_line.append(0x10)
assert(len(key) <= 126)
payload_line.append(len(key))
payload_line.extend(ord(c) for c in key)
assert(len(value) <= 126)
payload_line.append(len(value))
payload_line.extend(ord(c) for c in value)
payload_len += len(payload_line)
payload_bytes.append(payload_line)
# fill in header
payload_bytes[0].extend([
(payload_len >> 16) & 0xff,
(payload_len >> 8) & 0xff,
(payload_len) & 0xff,
# header frame
0x01,
# flags
0x04,
# stream id
0x00,
0x00,
0x00,
0x01
])
hex_bytes = [ord(c) for c in "abcdefABCDEF0123456789"]
def esc_c(line):
out = "\""
last_was_hex = False
for c in line:
if 32 <= c < 127:
if c in hex_bytes and last_was_hex:
out += "\"\""
if c != ord('"'):
out += chr(c)
else:
out += "\\\""
last_was_hex = False
else:
out += "\\x%02x" % c
last_was_hex = True
return out + "\""
# dump bytes
for line in payload_bytes:
print esc_c(line)
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