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deploy: bcc101aa5012f46127af8ad8ea2906c5e923a20f
2020-12-21 11:45:07 +00:00
#
# HTTP Utilities
# (c) Copyright 2018
# Status Research & Development GmbH
#
# Licensed under either of
# Apache License, version 2.0, (LICENSE-APACHEv2)
# MIT license (LICENSE-MIT)
import times, strutils
const
ALPHA* = {'a'..'z', 'A'..'Z'}
NUM* = {'0'..'9'}
TOKEND* = {'!', '#', '$', '%', '&', '\'', '*', '+', '-', '.', '^', '_', '`',
'|', '~'}
# HTTP token delimeters
URITOKEND* = {'-', '.', '_', '~', ':', '/', '?', '#', '[', ']', '@', '!',
'$', '&', '\'', '(', ')', '*', '+', ',', ';', '=', '%'}
# URI token delimeters
SPACE* = {' ', '\t'}
COLON* = {':'}
SLASH* = {'/'}
DOT* = {'.'}
CR* = char(0x0D)
LF* = char(0x0A)
ALPHANUM = ALPHA + NUM
TOKENURI = TOKEND * URITOKEND - DOT
TOKENONLY = TOKEND - URITOKEND - DOT
URIONLY = URITOKEND - TOKEND - COLON - SLASH - DOT
HEADERNAME* = ALPHANUM + TOKENURI + TOKENONLY + DOT
# Legend:
# [0x81, 0x8D] - markers
# 0x81 - start HTTP request method
# 0x82 - end of HTTP request method
# 0x83 - start of HTTP request URI
# 0x84 - end of HTTP request URI
# 0x85 - start of HTTP version
# 0x86 - end of HTTP version
# 0x87 - LF
# 0x88 - start of header name
# 0x89 - end of header name
# 0x8A - start of header value
# 0x8B - end of header value
# 0x8C - last header LF
# 0x8D - header's finish
# [0xC0, 0xCF] - errors
# * ALPHA NUM TO^UR TOON URON CR LF COLON SLASH DOT SPACE PAD PAD PAD PAD
requestSM = [
0xC0, 0x81, 0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0xCF, 0xCF, 0xCF, 0xCF, # s00: first method char
0xC1, 0x01, 0xC1, 0xC1, 0xC1, 0xC1, 0xC1, 0xC1, 0xC1, 0xC1, 0xC1, 0x82, 0xCF, 0xCF, 0xCF, 0xCF, # s01: method
0xC2, 0x83, 0x83, 0x83, 0xC2, 0x83, 0xC2, 0xC2, 0x83, 0x83, 0x83, 0xC2, 0xCF, 0xCF, 0xCF, 0xCF, # s02: first uri char
0xC2, 0x03, 0x03, 0x03, 0xC2, 0x03, 0xC2, 0xC2, 0x03, 0x03, 0x03, 0x84, 0xCF, 0xCF, 0xCF, 0xCF, # s03: uri
0xC3, 0x85, 0xC3, 0xC3, 0xC3, 0xC3, 0xC3, 0xC3, 0xC3, 0xC3, 0xC3, 0xC3, 0xCF, 0xCF, 0xCF, 0xCF, # s04: first version char
0xC3, 0x05, 0x05, 0xC3, 0xC3, 0xC3, 0x86, 0xC3, 0xC3, 0x05, 0x05, 0xC3, 0xCF, 0xCF, 0xCF, 0xCF, # s05: version
0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0x87, 0xC4, 0xC4, 0xC4, 0xC4, 0xCF, 0xCF, 0xCF, 0xCF, # s06: LF
0xC5, 0x88, 0x88, 0x88, 0x88, 0xC5, 0x8D, 0xC5, 0xC5, 0xC5, 0x88, 0xC5, 0xCF, 0xCF, 0xCF, 0xCF, # s07: first token char
0xC5, 0x08, 0x08, 0x08, 0x08, 0xC5, 0xC5, 0xC5, 0x89, 0xC5, 0x08, 0xC5, 0xCF, 0xCF, 0xCF, 0xCF, # s08: header name
0x8B, 0x8B, 0x8B, 0x8B, 0x8B, 0x8B, 0x8C, 0xC6, 0x8B, 0x8B, 0x8B, 0x8A, 0xCF, 0xCF, 0xCF, 0xCF, # s09: first header char
0x8B, 0x8B, 0x8B, 0x8B, 0x8B, 0xC6, 0x8C, 0xC6, 0x8B, 0x8B, 0x8B, 0x0A, 0xCF, 0xCF, 0xCF, 0xCF, # s0a: 1st space
0x0B, 0x0B, 0x0B, 0x0B, 0x0B, 0x0B, 0x8C, 0xC7, 0x0B, 0x0B, 0x0B, 0x0B, 0xCF, 0xCF, 0xCF, 0xCF, # s0b: header value
0xC7, 0xC7, 0xC7, 0xC7, 0xC7, 0xC7, 0xC7, 0x87, 0xC7, 0xC7, 0xC7, 0xC7, 0xCF, 0xCF, 0xCF, 0xCF, # s0c: header LF
0xC8, 0xC8, 0xC8, 0xC8, 0xC8, 0xC8, 0xC8, 0x8E, 0xC8, 0xC8, 0xC8, 0xC8, 0xCF, 0xCF, 0xCF, 0xCF # s0d: last LF
]
# Legend:
# [0x81, 0x8D] - markers
# 0x81 - start HTTP version
# 0x82 - end of HTTP version
# 0x83 - start of HTTP response code
# 0x84 - end of HTTP response code
# 0x85 - start of HTTP reason string
# 0x86 - end of HTTP reason string
# 0x87 - LF
# 0x88 - start of header name
# 0x89 - end of header name
# 0x8A - start of header value
# 0x8B - end of header value
# 0x8C - last header LF
# 0x8D - header's finish
# [0xC0, 0xCF] - errors
# * ALPHA NUM TO^UR TOON URON CR LF COLON SLASH DOT SPACE PAD PAD PAD PAD
responseSM = [
0xC0, 0x81, 0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0xCF, 0xCF, 0xCF, 0xCF, # s00: first version char
0xC1, 0x01, 0x01, 0xC1, 0xC1, 0xC1, 0xC1, 0xC1, 0xC1, 0x01, 0x01, 0x82, 0xCF, 0xCF, 0xCF, 0xCF, # s01: version
0xC2, 0xC2, 0x83, 0xC2, 0xC2, 0xC2, 0xC2, 0xC2, 0xC2, 0xC2, 0xC2, 0xC2, 0xCF, 0xCF, 0xCF, 0xCF, # s02: first code char
0xC2, 0xC2, 0x03, 0xC2, 0xC2, 0xC2, 0x84, 0xC2, 0xC2, 0xC2, 0xC2, 0x85, 0xCF, 0xCF, 0xCF, 0xCF, # s03: code
0xC2, 0xC2, 0xC2, 0xC2, 0xC2, 0xC2, 0xC2, 0x88, 0xC2, 0xC2, 0xC2, 0xC2, 0xCF, 0xCF, 0xCF, 0xCF, # s04: no reason LF
0xC3, 0x86, 0x86, 0x86, 0x86, 0x86, 0xC3, 0xC3, 0x86, 0x86, 0x86, 0x86, 0xCF, 0xCF, 0xCF, 0xCF, # s05: first reason char
0xC3, 0x06, 0x06, 0x06, 0x06, 0x06, 0x87, 0xC3, 0x06, 0x06, 0x06, 0x06, 0xCF, 0xCF, 0xCF, 0xCF, # s06: reason
0xC3, 0xC3, 0xC3, 0xC3, 0xC3, 0xC3, 0xC3, 0x88, 0xC3, 0xC3, 0xC3, 0xC3, 0xCF, 0xCF, 0xCF, 0xCF, # s07: LF
0xC3, 0x8A, 0x8A, 0x8A, 0x8A, 0xC3, 0x8F, 0xC3, 0xC3, 0xC3, 0x8A, 0xC4, 0xCF, 0xCF, 0xCF, 0xCF, # s08: no headers CR
0xC4, 0x8A, 0x8A, 0x8A, 0x8A, 0xC4, 0x8F, 0xC4, 0xC4, 0xC4, 0x8A, 0xC4, 0xCF, 0xCF, 0xCF, 0xCF, # s09: first token char
0xC4, 0x0A, 0x0A, 0x0A, 0x0A, 0xC4, 0xC4, 0xC4, 0x8B, 0xC4, 0x0A, 0xC4, 0xCF, 0xCF, 0xCF, 0xCF, # s0a: header name
0x8D, 0x8D, 0x8D, 0x8D, 0x8D, 0x8D, 0x8E, 0xC5, 0x8D, 0x8D, 0x8D, 0x8C, 0xCF, 0xCF, 0xCF, 0xCF, # s0b: first header char
0x8D, 0x8D, 0x8D, 0x8D, 0x8D, 0xC5, 0x8E, 0xC5, 0x8D, 0x8D, 0x8D, 0x0C, 0xCF, 0xCF, 0xCF, 0xCF, # s0c: 1st space
0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x8E, 0xC5, 0x0D, 0x0D, 0x0D, 0x0D, 0xCF, 0xCF, 0xCF, 0xCF, # s0d: header value
0xC7, 0xC7, 0xC7, 0xC7, 0xC7, 0xC7, 0xC7, 0x89, 0xC7, 0xC7, 0xC7, 0xC7, 0xCF, 0xCF, 0xCF, 0xCF, # s0e: header LF
0xC8, 0xC8, 0xC8, 0xC8, 0xC8, 0xC8, 0xC8, 0x9F, 0xC8, 0xC8, 0xC8, 0xC8, 0xCF, 0xCF, 0xCF, 0xCF, # s0f: last LF
]
type
HttpCode* = enum
## HTTP error codes
Http100 = "100 Continue",
Http101 = "101 Switching Protocols",
Http200 = "200 OK",
Http201 = "201 Created",
Http202 = "202 Accepted",
Http203 = "203 Non-Authoritative Information",
Http204 = "204 No Content",
Http205 = "205 Reset Content",
Http206 = "206 Partial Content",
Http300 = "300 Multiple Choices",
Http301 = "301 Moved Permanently",
Http302 = "302 Found",
Http303 = "303 See Other",
Http304 = "304 Not Modified",
Http305 = "305 Use Proxy",
Http307 = "307 Temporary Redirect",
Http400 = "400 Bad Request",
Http401 = "401 Unauthorized",
Http403 = "403 Forbidden",
Http404 = "404 Not Found",
Http405 = "405 Method Not Allowed",
Http406 = "406 Not Acceptable",
Http407 = "407 Proxy Authentication Required",
Http408 = "408 Request Timeout",
Http409 = "409 Conflict",
Http410 = "410 Gone",
Http411 = "411 Length Required",
Http412 = "412 Precondition Failed",
Http413 = "413 Request Entity Too Large",
Http414 = "414 Request-URI Too Long",
Http415 = "415 Unsupported Media Type",
Http416 = "416 Requested Range Not Satisfiable",
Http417 = "417 Expectation Failed",
Http418 = "418 I'm a teapot",
Http421 = "421 Misdirected Request",
Http422 = "422 Unprocessable Entity",
Http426 = "426 Upgrade Required",
Http428 = "428 Precondition Required",
Http429 = "429 Too Many Requests",
Http431 = "431 Request Header Fields Too Large",
Http451 = "451 Unavailable For Legal Reasons",
Http500 = "500 Internal Server Error",
Http501 = "501 Not Implemented",
Http502 = "502 Bad Gateway",
Http503 = "503 Service Unavailable",
Http504 = "504 Gateway Timeout",
Http505 = "505 HTTP Version Not Supported"
HttpVersion* = enum
## HTTP version
HttpVersion09
HttpVersion11,
HttpVersion10,
HttpVersion20,
HttpVersionError
HttpMethod* = enum
## HTTP methods
MethodGet,
MethodPost,
MethodHead,
MethodPut,
MethodDelete,
MethodTrace,
MethodOptions,
MethodConnect,
MethodPatch,
MethodError
HttpStatus* = enum
## HTTP parser status type
Success, Failure
HttpHeaderPart* = object
## HTTP offset representation object
s*: int ## Start offset
e*: int ## End offset
HttpHeader* = object
## HTTP header representation object
name*: HttpHeaderPart ## Header name
value*: HttpHeaderPart ## Header value
HttpRequestHeader* = object
## HTTP request header
data: seq[byte] ## Data blob
meth*: HttpMethod ## HTTP request method
version*: HttpVersion ## HTTP version
status*: HttpStatus ## HTTP headers processing status
url: HttpHeaderPart
state*: int
hdrs: seq[HttpHeader]
length*: int ## HTTP headers length
HttpResponseHeader* = object
## HTTP response header
data: seq[byte] ## Data blob
version*: HttpVersion ## HTTP version
code*: int ## HTTP result code
status*: HttpStatus ## HTTP headers processing status
rsn: HttpHeaderPart
state*: int
hdrs: seq[HttpHeader]
length*: int ## HTTP headers length
HttpReqRespHeader* = HttpRequestHeader | HttpResponseHeader
template processHeaders(sm: untyped, state: var int, ch: char): int =
var res = true
var code = 0
case ch
of ALPHA:
code = 1
of NUM:
code = 2
of TOKENURI:
code = 3
of TOKENONLY:
code = 4
of URIONLY:
code = 5
of CR:
code = 6
of LF:
code = 7
of COLON:
code = 8
of SLASH:
code = 9
of DOT:
code = 10
of SPACE:
code = 11
else:
code = 0
var newstate = sm[(state shl 4) + code]
state = newstate and 0x0F
newstate
proc processMethod(data: seq[char], s, e: int): HttpMethod =
result = HttpMethod.MethodError
let length = e - s + 1
case char(data[s])
of 'G':
if length == 3:
if data[s + 1] == 'E' and data[s + 2] == 'T':
result = MethodGet
of 'P':
if length == 3:
if data[s + 1] == 'U' and data[s + 2] == 'T':
result = MethodPut
elif length == 4:
if data[s + 1] == 'O' and data[s + 2] == 'S' and data[s + 3] == 'T':
result = MethodPost
elif length == 5:
if data[s + 1] == 'A' and data[s + 2] == 'T' and data[s + 3] == 'C' and
data[s + 4] == 'H':
result = MethodPatch
of 'D':
if length == 6:
if data[s + 1] == 'E' and data[s + 2] == 'L' and data[s + 3] == 'E' and
data[s + 4] == 'T' and data[s + 5] == 'E':
result = MethodDelete
of 'T':
if length == 5:
if data[s + 1] == 'R' and data[s + 2] == 'A' and data[s + 3] == 'C' and
data[s + 4] == 'E':
result = MethodTrace
of 'O':
if length == 7:
if data[s + 1] == 'P' and data[s + 2] == 'T' and data[s + 3] == 'I' and
data[s + 4] == 'O' and data[s + 5] == 'N' and data[s + 6] == 'S':
result = MethodOptions
of 'C':
if length == 7:
if data[s + 1] == 'O' and data[s + 2] == 'N' and data[s + 3] == 'N' and
data[s + 4] == 'E' and data[s + 5] == 'C' and data[s + 6] == 'T':
result = MethodConnect
else:
discard
proc processVersion(data: seq[char], s, e: int): HttpVersion =
result = HttpVersionError
let length = e - s + 1
if length == 8:
if data[s] == 'H' and data[s + 1] == 'T' and data[s + 2] == 'T' and
data[s + 3] == 'P' and data[s + 4] == '/':
if data[s + 5] == '1' and data[s + 6] == '.':
if data[s + 7] == '0':
result = HttpVersion10
elif data[s + 7] == '1':
result = HttpVersion11
elif data[s + 5] == '0' and data[s + 6] == '.':
if data[s + 7] == '9':
result = HttpVersion09
elif data[s + 5] == '2' and data[s + 6] == '.':
if data[s + 7] == '0':
result = HttpVersion20
proc processCode(data: seq[char], s, e: int): int =
result = -1
let length = e - s + 1
if length == 3:
result = (ord(data[s]) - ord('0')) * 100 +
(ord(data[s + 1]) - ord('0')) * 10 +
ord(data[s + 2]) - ord('0')
proc parseRequest*[T: char|byte](data: seq[T]): HttpRequestHeader =
## Parse sequence of characters or bytes as HTTP request header.
##
## Note: to prevent unnecessary allocations source array ``data`` will be
## be shallow copied to result and all parsed fields will have references to
## this buffer. If you plan to change contents of ``data`` while parsing
## request and/or processing headers, please make a real copy of ``data`` and
## pass copy to ``parseRequest(data)``.
##
## Returns `HttpRequestHeader` instance.
var
index = 0
state = 0
start = -1
finish = 0
hdr: HttpHeader
result.status = HttpStatus.Failure
result.version = HttpVersionError
result.meth = MethodError
result.hdrs = newSeq[HttpHeader]()
if len(data) == 0:
return
# Preserve ``data`` sequence in our object.
shallowCopy(result.data, cast[seq[byte]](data))
while index < len(data):
let ps = requestSM.processHeaders(state, char(data[index]))
result.state = ps
case ps
of 0x81:
start = index
of 0x82:
if start == -1:
break
finish = index - 1
when T is byte:
let m = processMethod(cast[seq[char]](data), start, finish)
else:
let m = processMethod(data, start, finish)
if m == HttpMethod.MethodError:
break
result.meth = m
start = -1
of 0x83:
start = index
of 0x84:
if start == -1:
break
finish = index - 1
result.url = HttpHeaderPart(s: start, e: finish)
start = -1
of 0x85:
start = index
of 0x86:
if start == -1:
break
finish = index - 1
when T is byte:
let m = processVersion(cast[seq[char]](data), start, finish)
else:
let m = processVersion(data, start, finish)
if m == HttpVersion.HttpVersionError:
break
result.version = m
start = -1
of 0x87, 0x8A, 0x8D:
discard
of 0x88:
start = index
of 0x89:
if start == -1:
break
finish = index - 1
hdr.name = HttpHeaderPart(s: start, e: finish)
start = -1
of 0x8B:
start = index
of 0x8C:
if start == -1:
# empty header
hdr.value = HttpHeaderPart(s: -1, e: -1)
else:
finish = index - 1
hdr.value = HttpHeaderPart(s: start, e: finish)
result.hdrs.add(hdr)
start = -1
of 0x8E:
result.length = index + 1
result.status = HttpStatus.Success
break
of 0xC0..0xCF:
# error
break
of 0x00..0x0F:
# data processing
discard
else:
# must not be happened
break
inc(index)
proc parseResponse*[T: char|byte](data: seq[T]): HttpResponseHeader =
## Parse sequence of characters or bytes as HTTP response header.
## Returns `HttpResponseHeader` instance.
var
index = 0
state = 0
start = -1
finish = 0
hdr: HttpHeader
result.status = HttpStatus.Failure
result.version = HttpVersionError
result.code = -1
result.hdrs = newSeq[HttpHeader]()
if len(data) == 0:
return
# Preserve ``data`` sequence in our object.
shallowCopy(result.data, cast[seq[byte]](data))
while index < len(data):
let ps = responseSM.processHeaders(state, char(data[index]))
result.state = ps
case ps
of 0x81:
start = index
of 0x82:
if start == -1:
break
finish = index - 1
when T is byte:
let m = processVersion(cast[seq[char]](data), start, finish)
else:
let m = processVersion(data, start, finish)
if m == HttpVersion.HttpVersionError:
break
result.version = m
start = -1
of 0x83:
start = index
of 0x84, 0x85:
if start == -1:
break
finish = index - 1
when T is byte:
let m = processCode(cast[seq[char]](data), start, finish)
else:
let m = processCode(data, start, finish)
if m == -1:
break
result.code = m
if ps == 0x84:
result.rsn = HttpHeaderPart(s: -1, e: -1)
start = -1
of 0x86:
start = index
of 0x87:
if start == -1:
break
finish = index - 1
result.rsn = HttpHeaderPart(s: start, e: finish)
start = -1
of 0x88, 0x89, 0x8C, 0x8F:
discard
of 0x8A:
start = index
of 0x8B:
if start == -1:
break
finish = index - 1
hdr.name = HttpHeaderPart(s: start, e: finish)
start = -1
of 0x8D:
start = index
of 0x8E:
if start == -1:
# empty header
hdr.value = HttpHeaderPart(s: -1, e: -1)
else:
finish = index - 1
hdr.value = HttpHeaderPart(s: start, e: finish)
result.hdrs.add(hdr)
start = -1
of 0x9F:
result.length = index + 1
result.status = HttpStatus.Success
break
of 0xC0..0xCF:
# error
break
of 0x00..0x0F:
# data processing
discard
else:
# must not be happened
break
inc(index)
template success*(reqresp: HttpReqRespHeader): bool =
## Returns ``true`` is ``reqresp`` was successfully parsed.
reqresp.status == HttpStatus.Success
template failed*(reqresp: HttpReqRespHeader): bool =
## Returns ``true`` if ``reqresp`` parsing was failed.
reqresp.status == HttpStatus.Failure
proc compare(data: seq[byte], header: HttpHeader, key: string): int =
## Case-insensitive comparison function.
let length = header.name.e - header.name.s + 1
result = length - len(key)
if result == 0:
var idx = 0
for i in header.name.s..header.name.e:
result = ord(toLowerAscii(char(data[i]))) - ord(toLowerAscii(key[idx]))
if result != 0:
return
inc(idx)
proc contains*(reqresp: HttpReqRespHeader, header: string): bool =
## Return ``true``, if header with key ``header`` exists in `reqresp` object.
result = false
if reqresp.success():
for item in reqresp.hdrs:
if reqresp.data.compare(item, header) == 0:
result = true
proc toString(data: openarray[byte], start, stop: int): string =
## Slice a raw data blob into a string
## This is an inclusive slice
## The output string is null-terminated for raw C-compat
let len = stop - start + 1
result = newString(len)
copyMem(result[0].addr, data[start].unsafeAddr, len)
proc `[]`*(reqresp: HttpReqRespHeader, header: string): string =
## Retrieve HTTP header value from ``reqresp`` with key ``header``.
if reqresp.success():
for item in reqresp.hdrs:
if reqresp.data.compare(item, header) == 0:
if item.value.s == -1 and item.value.e == -1:
result = ""
else:
result = reqresp.data.toString(item.value.s, item.value.e)
break
iterator headers*(reqresp: HttpReqRespHeader,
key: string = ""): tuple[name: string, value: string] =
## Iterates over all or specific headers in ``reqresp`` headers object.
## You can specify ``key` string to iterate only over headers which has key
## equal to ``key`` string.
if reqresp.success():
for item in reqresp.hdrs:
if len(key) == 0:
var name = reqresp.data.toString(item.name.s, item.name.e)
var value: string
if item.value.s == -1 and item.value.e == -1:
value = ""
else:
value = reqresp.data.toString(item.value.s, item.value.e)
yield (name, value)
else:
if reqresp.data.compare(item, key) == 0:
var name = key
var value: string
if item.value.s == -1 and item.value.e == -1:
value = ""
else:
value = reqresp.data.toString(item.value.s, item.value.e)
yield (name, value)
proc uri*(request: HttpRequestHeader): string =
## Returns HTTP request URI as string from ``request``.
if request.success():
if request.url.s == -1 and request.url.e == -1:
result = ""
else:
result = request.data.toString(request.url.s, request.url.e)
proc reason*(response: HttpResponseHeader): string =
## Returns HTTP reason string from ``response``.
if response.success():
if response.rsn.s == -1 and response.rsn.e == -1:
result = ""
else:
result = response.data.toString(response.rsn.s, response.rsn.e)
proc len*(reqresp: HttpReqRespHeader): int =
## Returns number of headers in ``reqresp``.
if reqresp.success():
result = len(reqresp.hdrs)
proc size*(reqresp: HttpReqRespHeader): int =
## Returns size of HTTP headers in octets (bytes).
if reqresp.success():
result = reqresp.length
proc `$`*(version: HttpVersion): string =
## Return string representation of HTTP version ``version``.
case version
of HttpVersion09:
result = "HTTP/0.9"
of HttpVersion10:
result = "HTTP/1.0"
of HttpVersion11:
result = "HTTP/1.1"
of HttpVersion20:
result = "HTTP/2.0"
else:
result = "HTTP/1.0"
{.push overflowChecks: off.}
proc contentLength*(reqresp: HttpReqRespHeader): int =
## Returns "Content-Length" header value as positive integer.
##
## If header is not present, ``0`` value will be returned, if value of header
## has non-integer value ``-1`` will be returned.
result = -1
if reqresp.success():
let nstr = reqresp["Content-Length"]
if len(nstr) == 0:
result = 0
else:
let vstr = strip(nstr)
result = 0
for i in 0..<len(vstr):
if vstr[i] in NUM:
var r = result
let digit = ord(vstr[i]) - ord('0')
r = r * 10 + digit
if r < result:
# overflow
result = -1
break
else:
result = r
else:
result = -1
break
{.pop.}
proc httpDate*(datetime: DateTime): string =
## Returns ``datetime`` formated as HTTP full date (RFC-822).
## ``Note``: ``datetime`` must be in UTC/GMT zone.
result = datetime.format("ddd, dd MMM yyyy HH:mm:ss")
result.add(" GMT")
proc httpDate*(): string {.inline.} =
## Returns current datetime formatted as HTTP full date (RFC-822).
result = utc(now()).httpDate()
proc `$`*(m: HttpMethod): string =
## Returns string representation of HTTP method ``m``.
case m
of MethodGet: "GET"
of MethodPost: "POST"
of MethodHead: "HEAD"
of MethodPut: "PUT"
of MethodDelete: "DELETE"
of MethodTrace: "TRACE"
of MethodOptions: "OPTIONS"
of MethodConnect: "CONNECT"
of MethodPatch: "PATCH"
of MethodError: "ERROR"
proc checkHeaderName*(value: string): bool =
## Validates ``value`` as `header field name` string and returns ``true``
## on success.
if len(value) == 0:
result = false
else:
result = true
for ch in value:
if ch notin HEADERNAME:
result = false
break
proc checkHeaderValue*(value: string): bool =
## Validates ``value`` as `header field value` string and returns ``true``
## on success.
result = true
for ch in value:
if (ch == CR) or (ch == LF):
result = false
break
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